arch/m68k/kernel/head.S

   1 /* -*- mode: asm -*-
   2 **
   3 ** head.S -- This file contains the initial boot code for the
   4 **           Linux/68k kernel.
   5 **
   6 ** Copyright 1993 by Hamish Macdonald
   7 **
   8 ** 68040 fixes by Michael Rausch
   9 ** 68060 fixes by Roman Hodek
  10 ** MMU cleanup by Randy Thelen
  11 ** Final MMU cleanup by Roman Zippel
  12 **
  13 ** Atari support by Andreas Schwab, using ideas of Robert de Vries
  14 ** and Bjoern Brauel
  15 ** VME Support by Richard Hirst
  16 **
  17 ** 94/11/14 Andreas Schwab: put kernel at PAGESIZE
  18 ** 94/11/18 Andreas Schwab: remove identity mapping of STRAM for Atari
  19 ** ++ Bjoern & Roman: ATARI-68040 support for the Medusa
  20 ** 95/11/18 Richard Hirst: Added MVME166 support
  21 ** 96/04/26 Guenther Kelleter: fixed identity mapping for Falcon with
  22 **                            Magnum- and FX-alternate ram
  23 ** 98/04/25 Phil Blundell: added HP300 support
  24 ** 1998/08/30 David Kilzer: Added support for font_desc structures
  25 **            for linux-2.1.115
  26 ** 9/02/11  Richard Zidlicky: added Q40 support (initial vesion 99/01/01)
  27 ** 2004/05/13 Kars de Jong: Finalised HP300 support
  28 **
  29 ** This file is subject to the terms and conditions of the GNU General Public
  30 ** License. See the file README.legal in the main directory of this archive
  31 ** for more details.
  32 **
  33 */
  34
  35 /*
  36  * Linux startup code.
  37  *
  38  * At this point, the boot loader has:
  39  * Disabled interrupts
  40  * Disabled caches
  41  * Put us in supervisor state.
  42  *
  43  * The kernel setup code takes the following steps:
  44  * .  Raise interrupt level
  45  * .  Set up initial kernel memory mapping.
  46  *    .  This sets up a mapping of the 4M of memory the kernel is located in.
  47  *    .  It also does a mapping of any initial machine specific areas.
  48  * .  Enable the MMU
  49  * .  Enable cache memories
  50  * .  Jump to kernel startup
  51  *
  52  * Much of the file restructuring was to accomplish:
  53  * 1) Remove register dependency through-out the file.
  54  * 2) Increase use of subroutines to perform functions
  55  * 3) Increase readability of the code
  56  *
  57  * Of course, readability is a subjective issue, so it will never be
  58  * argued that that goal was accomplished.  It was merely a goal.
  59  * A key way to help make code more readable is to give good
  60  * documentation.  So, the first thing you will find is exaustive
  61  * write-ups on the structure of the file, and the features of the
  62  * functional subroutines.
  63  *
  64  * General Structure:
  65  * ------------------
  66  *      Without a doubt the single largest chunk of head.S is spent
  67  * mapping the kernel and I/O physical space into the logical range
  68  * for the kernel.
  69  *      There are new subroutines and data structures to make MMU
  70  * support cleaner and easier to understand.
  71  *      First, you will find a routine call "mmu_map" which maps
  72  * a logical to a physical region for some length given a cache
  73  * type on behalf of the caller.  This routine makes writing the
  74  * actual per-machine specific code very simple.
  75  *      A central part of the code, but not a subroutine in itself,
  76  * is the mmu_init code which is broken down into mapping the kernel
  77  * (the same for all machines) and mapping machine-specific I/O
  78  * regions.
  79  *      Also, there will be a description of engaging the MMU and
  80  * caches.
  81  *      You will notice that there is a chunk of code which
  82  * can emit the entire MMU mapping of the machine.  This is present
  83  * only in debug modes and can be very helpful.
  84  *      Further, there is a new console driver in head.S that is
  85  * also only engaged in debug mode.  Currently, it's only supported
  86  * on the Macintosh class of machines.  However, it is hoped that
  87  * others will plug-in support for specific machines.
  88  *
  89  * ######################################################################
  90  *
  91  * mmu_map
  92  * -------
  93  *      mmu_map was written for two key reasons.  First, it was clear
  94  * that it was very difficult to read the previous code for mapping
  95  * regions of memory.  Second, the Macintosh required such extensive
  96  * memory allocations that it didn't make sense to propagate the
  97  * existing code any further.
  98  *      mmu_map requires some parameters:
  99  *
 100  *      mmu_map (logical, physical, length, cache_type)
 101  *
 102  *      While this essentially describes the function in the abstract, you'll
 103  * find more indepth description of other parameters at the implementation site.
 104  *
 105  * mmu_get_root_table_entry
 106  * ------------------------
 107  * mmu_get_ptr_table_entry
 108  * -----------------------
 109  * mmu_get_page_table_entry
 110  * ------------------------
 111  *
 112  *      These routines are used by other mmu routines to get a pointer into
 113  * a table, if necessary a new table is allocated. These routines are working
 114  * basically like pmd_alloc() and pte_alloc() in <asm/pgtable.h>. The root
 115  * table needs of course only to be allocated once in mmu_get_root_table_entry,
 116  * so that here also some mmu specific initialization is done. The second page
 117  * at the start of the kernel (the first page is unmapped later) is used for
 118  * the kernel_pg_dir. It must be at a position known at link time (as it's used
 119  * to initialize the init task struct) and since it needs special cache
 120  * settings, it's the easiest to use this page, the rest of the page is used
 121  * for further pointer tables.
 122  * mmu_get_page_table_entry allocates always a whole page for page tables, this
 123  * means 1024 pages and so 4MB of memory can be mapped. It doesn't make sense
 124  * to manage page tables in smaller pieces as nearly all mappings have that
 125  * size.
 126  *
 127  * ######################################################################
 128  *
 129  *
 130  * ######################################################################
 131  *
 132  * mmu_engage
 133  * ----------
 134  *      Thanks to a small helping routine enabling the mmu got quite simple
 135  * and there is only one way left. mmu_engage makes a complete a new mapping
 136  * that only includes the absolute necessary to be able to jump to the final
 137  * position and to restore the original mapping.
 138  * As this code doesn't need a transparent translation register anymore this
 139  * means all registers are free to be used by machines that needs them for
 140  * other purposes.
 141  *
 142  * ######################################################################
 143  *
 144  * mmu_print
 145  * ---------
 146  *      This algorithm will print out the page tables of the system as
 147  * appropriate for an 030 or an 040.  This is useful for debugging purposes
 148  * and as such is enclosed in #ifdef MMU_PRINT/#endif clauses.
 149  *
 150  * ######################################################################
 151  *
 152  * console_init
 153  * ------------
 154  *      The console is also able to be turned off.  The console in head.S
 155  * is specifically for debugging and can be very useful.  It is surrounded by
 156  * #ifdef CONSOLE/#endif clauses so it doesn't have to ship in known-good
 157  * kernels.  It's basic algorithm is to determine the size of the screen
 158  * (in height/width and bit depth) and then use that information for
 159  * displaying an 8x8 font or an 8x16 (widthxheight).  I prefer the 8x8 for
 160  * debugging so I can see more good data.  But it was trivial to add support
 161  * for both fonts, so I included it.
 162  *      Also, the algorithm for plotting pixels is abstracted so that in
 163  * theory other platforms could add support for different kinds of frame
 164  * buffers.  This could be very useful.
 165  *
 166  * console_put_penguin
 167  * -------------------
 168  *      An important part of any Linux bring up is the penguin and there's
 169  * nothing like getting the Penguin on the screen!  This algorithm will work
 170  * on any machine for which there is a console_plot_pixel.
 171  *
 172  * console_scroll
 173  * --------------
 174  *      My hope is that the scroll algorithm does the right thing on the
 175  * various platforms, but it wouldn't be hard to add the test conditions
 176  * and new code if it doesn't.
 177  *
 178  * console_putc
 179  * -------------
 180  *
 181  * ######################################################################
 182  *
 183  *      Register usage has greatly simplified within head.S. Every subroutine
 184  * saves and restores all registers that it modifies (except it returns a
 185  * value in there of course). So the only register that needs to be initialized
 186  * is the stack pointer.
 187  * All other init code and data is now placed in the init section, so it will
 188  * be automatically freed at the end of the kernel initialization.
 189  *
 190  * ######################################################################
 191  *
 192  * options
 193  * -------
 194  *      There are many options available in a build of this file.  I've
 195  * taken the time to describe them here to save you the time of searching
 196  * for them and trying to understand what they mean.
 197  *
 198  * CONFIG_xxx:  These are the obvious machine configuration defines created
 199  * during configuration.  These are defined in autoconf.h.
 200  *
 201  * CONSOLE:     There is support for head.S console in this file.  This
 202  * console can talk to a Mac frame buffer, but could easily be extrapolated
 203  * to extend it to support other platforms.
 204  *
 205  * TEST_MMU:    This is a test harness for running on any given machine but
 206  * getting an MMU dump for another class of machine.  The classes of machines
 207  * that can be tested are any of the makes (Atari, Amiga, Mac, VME, etc.)
 208  * and any of the models (030, 040, 060, etc.).
 209  *
 210  *      NOTE:   TEST_MMU is NOT permanent!  It is scheduled to be removed
 211  *              When head.S boots on Atari, Amiga, Macintosh, and VME
 212  *              machines.  At that point the underlying logic will be
 213  *              believed to be solid enough to be trusted, and TEST_MMU
 214  *              can be dropped.  Do note that that will clean up the
 215  *              head.S code significantly as large blocks of #if/#else
 216  *              clauses can be removed.
 217  *
 218  * MMU_NOCACHE_KERNEL:  On the Macintosh platform there was an inquiry into
 219  * determing why devices don't appear to work.  A test case was to remove
 220  * the cacheability of the kernel bits.
 221  *
 222  * MMU_PRINT:   There is a routine built into head.S that can display the
 223  * MMU data structures.  It outputs its result through the serial_putc
 224  * interface.  So where ever that winds up driving data, that's where the
 225  * mmu struct will appear.  On the Macintosh that's typically the console.
 226  *
 227  * SERIAL_DEBUG:        There are a series of putc() macro statements
 228  * scattered through out the code to give progress of status to the
 229  * person sitting at the console.  This constant determines whether those
 230  * are used.
 231  *
 232  * DEBUG:       This is the standard DEBUG flag that can be set for building
 233  *              the kernel.  It has the effect adding additional tests into
 234  *              the code.
 235  *
 236  * FONT_6x11:
 237  * FONT_8x8:
 238  * FONT_8x16:
 239  *              In theory these could be determined at run time or handed
 240  *              over by the booter.  But, let's be real, it's a fine hard
 241  *              coded value.  (But, you will notice the code is run-time
 242  *              flexible!)  A pointer to the font's struct font_desc
 243  *              is kept locally in Lconsole_font.  It is used to determine
 244  *              font size information dynamically.
 245  *
 246  * Atari constants:
 247  * USE_PRINTER: Use the printer port for serial debug.
 248  * USE_SCC_B:   Use the SCC port A (Serial2) for serial debug.
 249  * USE_SCC_A:   Use the SCC port B (Modem2) for serial debug.
 250  * USE_MFP:     Use the ST-MFP port (Modem1) for serial debug.
 251  *
 252  * Macintosh constants:
 253  * MAC_USE_SCC_A: Use SCC port A (modem) for serial debug and early console.
 254  * MAC_USE_SCC_B: Use SCC port B (printer) for serial debug and early console.
 255  */
 256
 257 #include <linux/linkage.h>
 258 #include <linux/init.h>
 259 #include <asm/bootinfo.h>
 260 #include <asm/setup.h>
 261 #include <asm/entry.h>
 262 #include <asm/pgtable.h>
 263 #include <asm/page.h>
 264 #include <asm/asm-offsets.h>
 265
 266 #ifdef CONFIG_MAC
 267
 268 #include <asm/machw.h>
 269
 270 #ifdef CONFIG_FRAMEBUFFER_CONSOLE
 271 #define CONSOLE
 272 #define CONSOLE_PENGUIN
 273 #endif
 274
 275 #ifdef CONFIG_EARLY_PRINTK
 276 #define SERIAL_DEBUG
 277 #else
 278 #undef SERIAL_DEBUG
 279 #endif
 280
 281 #else /* !CONFIG_MAC */
 282
 283 #define SERIAL_DEBUG
 284
 285 #endif /* !CONFIG_MAC */
 286
 287 #undef MMU_PRINT
 288 #undef MMU_NOCACHE_KERNEL
 289 #undef DEBUG
 290
 291 /*
 292  * For the head.S console, there are three supported fonts, 6x11, 8x16 and 8x8.
 293  * The 8x8 font is harder to read but fits more on the screen.
 294  */
 295 #define FONT_8x8        /* default */
 296 /* #define FONT_8x16 */ /* 2nd choice */
 297 /* #define FONT_6x11 */ /* 3rd choice */
 298
 299 .globl kernel_pg_dir
 300 .globl availmem
 301 .globl m68k_pgtable_cachemode
 302 .globl m68k_supervisor_cachemode
 303 #ifdef CONFIG_MVME16x
 304 .globl mvme_bdid
 305 #endif
 306 #ifdef CONFIG_Q40
 307 .globl q40_mem_cptr
 308 #endif
 309
 310 CPUTYPE_040     = 1     /* indicates an 040 */
 311 CPUTYPE_060     = 2     /* indicates an 060 */
 312 CPUTYPE_0460    = 3     /* if either above are set, this is set */
 313 CPUTYPE_020     = 4     /* indicates an 020 */
 314
 315 /* Translation control register */
 316 TC_ENABLE = 0x8000
 317 TC_PAGE8K = 0x4000
 318 TC_PAGE4K = 0x0000
 319
 320 /* Transparent translation registers */
 321 TTR_ENABLE      = 0x8000        /* enable transparent translation */
 322 TTR_ANYMODE     = 0x4000        /* user and kernel mode access */
 323 TTR_KERNELMODE  = 0x2000        /* only kernel mode access */
 324 TTR_USERMODE    = 0x0000        /* only user mode access */
 325 TTR_CI          = 0x0400        /* inhibit cache */
 326 TTR_RW          = 0x0200        /* read/write mode */
 327 TTR_RWM         = 0x0100        /* read/write mask */
 328 TTR_FCB2        = 0x0040        /* function code base bit 2 */
 329 TTR_FCB1        = 0x0020        /* function code base bit 1 */
 330 TTR_FCB0        = 0x0010        /* function code base bit 0 */
 331 TTR_FCM2        = 0x0004        /* function code mask bit 2 */
 332 TTR_FCM1        = 0x0002        /* function code mask bit 1 */
 333 TTR_FCM0        = 0x0001        /* function code mask bit 0 */
 334
 335 /* Cache Control registers */
 336 CC6_ENABLE_D    = 0x80000000    /* enable data cache (680[46]0) */
 337 CC6_FREEZE_D    = 0x40000000    /* freeze data cache (68060) */
 338 CC6_ENABLE_SB   = 0x20000000    /* enable store buffer (68060) */
 339 CC6_PUSH_DPI    = 0x10000000    /* disable CPUSH invalidation (68060) */
 340 CC6_HALF_D      = 0x08000000    /* half-cache mode for data cache (68060) */
 341 CC6_ENABLE_B    = 0x00800000    /* enable branch cache (68060) */
 342 CC6_CLRA_B      = 0x00400000    /* clear all entries in branch cache (68060) */
 343 CC6_CLRU_B      = 0x00200000    /* clear user entries in branch cache (68060) */
 344 CC6_ENABLE_I    = 0x00008000    /* enable instruction cache (680[46]0) */
 345 CC6_FREEZE_I    = 0x00004000    /* freeze instruction cache (68060) */
 346 CC6_HALF_I      = 0x00002000    /* half-cache mode for instruction cache (68060) */
 347 CC3_ALLOC_WRITE = 0x00002000    /* write allocate mode(68030) */
 348 CC3_ENABLE_DB   = 0x00001000    /* enable data burst (68030) */
 349 CC3_CLR_D       = 0x00000800    /* clear data cache (68030) */
 350 CC3_CLRE_D      = 0x00000400    /* clear entry in data cache (68030) */
 351 CC3_FREEZE_D    = 0x00000200    /* freeze data cache (68030) */
 352 CC3_ENABLE_D    = 0x00000100    /* enable data cache (68030) */
 353 CC3_ENABLE_IB   = 0x00000010    /* enable instruction burst (68030) */
 354 CC3_CLR_I       = 0x00000008    /* clear instruction cache (68030) */
 355 CC3_CLRE_I      = 0x00000004    /* clear entry in instruction cache (68030) */
 356 CC3_FREEZE_I    = 0x00000002    /* freeze instruction cache (68030) */
 357 CC3_ENABLE_I    = 0x00000001    /* enable instruction cache (68030) */
 358
 359 /* Miscellaneous definitions */
 360 PAGESIZE        = 4096
 361 PAGESHIFT       = 12
 362
 363 ROOT_TABLE_SIZE = 128
 364 PTR_TABLE_SIZE  = 128
 365 PAGE_TABLE_SIZE = 64
 366 ROOT_INDEX_SHIFT = 25
 367 PTR_INDEX_SHIFT  = 18
 368 PAGE_INDEX_SHIFT = 12
 369
 370 #ifdef DEBUG
 371 /* When debugging use readable names for labels */
 372 #ifdef __STDC__
 373 #define L(name) .head.S.##name
 374 #else
 375 #define L(name) .head.S./**/name
 376 #endif
 377 #else
 378 #ifdef __STDC__
 379 #define L(name) .L##name
 380 #else
 381 #define L(name) .L/**/name
 382 #endif
 383 #endif
 384
 385 /* The __INITDATA stuff is a no-op when ftrace or kgdb are turned on */
 386 #ifndef __INITDATA
 387 #define __INITDATA      .data
 388 #define __FINIT         .previous
 389 #endif
 390
 391 /* Several macros to make the writing of subroutines easier:
 392  * - func_start marks the beginning of the routine which setups the frame
 393  *   register and saves the registers, it also defines another macro
 394  *   to automatically restore the registers again.
 395  * - func_return marks the end of the routine and simply calls the prepared
 396  *   macro to restore registers and jump back to the caller.
 397  * - func_define generates another macro to automatically put arguments
 398  *   onto the stack call the subroutine and cleanup the stack again.
 399  */
 400
 401 /* Within subroutines these macros can be used to access the arguments
 402  * on the stack. With STACK some allocated memory on the stack can be
 403  * accessed and ARG0 points to the return address (used by mmu_engage).
 404  */
 405 #define STACK   %a6@(stackstart)
 406 #define ARG0    %a6@(4)
 407 #define ARG1    %a6@(8)
 408 #define ARG2    %a6@(12)
 409 #define ARG3    %a6@(16)
 410 #define ARG4    %a6@(20)
 411
 412 .macro  func_start      name,saveregs,stack=0
 413 L(\name):
 414         linkw   %a6,#-\stack
 415         moveml  \saveregs,%sp@-
 416 .set    stackstart,-\stack
 417
 418 .macro  func_return_\name
 419         moveml  %sp@+,\saveregs
 420         unlk    %a6
 421         rts
 422 .endm
 423 .endm
 424
 425 .macro  func_return     name
 426         func_return_\name
 427 .endm
 428
 429 .macro  func_call       name
 430         jbsr    L(\name)
 431 .endm
 432
 433 .macro  move_stack      nr,arg1,arg2,arg3,arg4
 434 .if     \nr
 435         move_stack      "(\nr-1)",\arg2,\arg3,\arg4
 436         movel   \arg1,%sp@-
 437 .endif
 438 .endm
 439
 440 .macro  func_define     name,nr=0
 441 .macro  \name   arg1,arg2,arg3,arg4
 442         move_stack      \nr,\arg1,\arg2,\arg3,\arg4
 443         func_call       \name
 444 .if     \nr
 445         lea     %sp@(\nr*4),%sp
 446 .endif
 447 .endm
 448 .endm
 449
 450 func_define     mmu_map,4
 451 func_define     mmu_map_tt,4
 452 func_define     mmu_fixup_page_mmu_cache,1
 453 func_define     mmu_temp_map,2
 454 func_define     mmu_engage
 455 func_define     mmu_get_root_table_entry,1
 456 func_define     mmu_get_ptr_table_entry,2
 457 func_define     mmu_get_page_table_entry,2
 458 func_define     mmu_print
 459 func_define     get_new_page
 460 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
 461 func_define     set_leds
 462 #endif
 463
 464 .macro  mmu_map_eq      arg1,arg2,arg3
 465         mmu_map \arg1,\arg1,\arg2,\arg3
 466 .endm
 467
 468 .macro  get_bi_record   record
 469         pea     \record
 470         func_call       get_bi_record
 471         addql   #4,%sp
 472 .endm
 473
 474 func_define     serial_putc,1
 475 func_define     console_putc,1
 476
 477 func_define     console_init
 478 func_define     console_put_stats
 479 func_define     console_put_penguin
 480 func_define     console_plot_pixel,3
 481 func_define     console_scroll
 482
 483 .macro  putc    ch
 484 #if defined(CONSOLE) || defined(SERIAL_DEBUG)
 485         pea     \ch
 486 #endif
 487 #ifdef CONSOLE
 488         func_call       console_putc
 489 #endif
 490 #ifdef SERIAL_DEBUG
 491         func_call       serial_putc
 492 #endif
 493 #if defined(CONSOLE) || defined(SERIAL_DEBUG)
 494         addql   #4,%sp
 495 #endif
 496 .endm
 497
 498 .macro  dputc   ch
 499 #ifdef DEBUG
 500         putc    \ch
 501 #endif
 502 .endm
 503
 504 func_define     putn,1
 505
 506 .macro  dputn   nr
 507 #ifdef DEBUG
 508         putn    \nr
 509 #endif
 510 .endm
 511
 512 .macro  puts            string
 513 #if defined(CONSOLE) || defined(SERIAL_DEBUG)
 514         __INITDATA
 515 .Lstr\@:
 516         .string "\string"
 517         __FINIT
 518         pea     %pc@(.Lstr\@)
 519         func_call       puts
 520         addql   #4,%sp
 521 #endif
 522 .endm
 523
 524 .macro  dputs   string
 525 #ifdef DEBUG
 526         puts    "\string"
 527 #endif
 528 .endm
 529
 530 #define is_not_amiga(lab) cmpl &MACH_AMIGA,%pc@(m68k_machtype); jne lab
 531 #define is_not_atari(lab) cmpl &MACH_ATARI,%pc@(m68k_machtype); jne lab
 532 #define is_not_mac(lab) cmpl &MACH_MAC,%pc@(m68k_machtype); jne lab
 533 #define is_not_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jne lab
 534 #define is_not_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jne lab
 535 #define is_not_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jne lab
 536 #define is_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jeq lab
 537 #define is_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jeq lab
 538 #define is_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jeq lab
 539 #define is_not_hp300(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); jne lab
 540 #define is_not_apollo(lab) cmpl &MACH_APOLLO,%pc@(m68k_machtype); jne lab
 541 #define is_not_q40(lab) cmpl &MACH_Q40,%pc@(m68k_machtype); jne lab
 542 #define is_not_sun3x(lab) cmpl &MACH_SUN3X,%pc@(m68k_machtype); jne lab
 543
 544 #define hasnt_leds(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); \
 545                         jeq 42f; \
 546                         cmpl &MACH_APOLLO,%pc@(m68k_machtype); \
 547                         jne lab ;\
 548                 42:\
 549
 550 #define is_040_or_060(lab)      btst &CPUTYPE_0460,%pc@(L(cputype)+3); jne lab
 551 #define is_not_040_or_060(lab)  btst &CPUTYPE_0460,%pc@(L(cputype)+3); jeq lab
 552 #define is_040(lab)             btst &CPUTYPE_040,%pc@(L(cputype)+3); jne lab
 553 #define is_060(lab)             btst &CPUTYPE_060,%pc@(L(cputype)+3); jne lab
 554 #define is_not_060(lab)         btst &CPUTYPE_060,%pc@(L(cputype)+3); jeq lab
 555 #define is_020(lab)             btst &CPUTYPE_020,%pc@(L(cputype)+3); jne lab
 556 #define is_not_020(lab)         btst &CPUTYPE_020,%pc@(L(cputype)+3); jeq lab
 557
 558 /* On the HP300 we use the on-board LEDs for debug output before
 559    the console is running.  Writing a 1 bit turns the corresponding LED
 560    _off_ - on the 340 bit 7 is towards the back panel of the machine.  */
 561 .macro  leds    mask
 562 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
 563         hasnt_leds(.Lled\@)
 564         pea     \mask
 565         func_call       set_leds
 566         addql   #4,%sp
 567 .Lled\@:
 568 #endif
 569 .endm
 570
 571 __HEAD
 572 ENTRY(_stext)
 573 /*
 574  * Version numbers of the bootinfo interface
 575  * The area from _stext to _start will later be used as kernel pointer table
 576  */
 577         bras    1f      /* Jump over bootinfo version numbers */
 578
 579         .long   BOOTINFOV_MAGIC
 580         .long   MACH_AMIGA, AMIGA_BOOTI_VERSION
 581         .long   MACH_ATARI, ATARI_BOOTI_VERSION
 582         .long   MACH_MVME147, MVME147_BOOTI_VERSION
 583         .long   MACH_MVME16x, MVME16x_BOOTI_VERSION
 584         .long   MACH_BVME6000, BVME6000_BOOTI_VERSION
 585         .long   MACH_MAC, MAC_BOOTI_VERSION
 586         .long   MACH_Q40, Q40_BOOTI_VERSION
 587         .long   MACH_HP300, HP300_BOOTI_VERSION
 588         .long   0
 589 1:      jra     __start
 590
 591 .equ    kernel_pg_dir,_stext
 592
 593 .equ    .,_stext+PAGESIZE
 594
 595 ENTRY(_start)
 596         jra     __start
 597 __INIT
 598 ENTRY(__start)
 599 /*
 600  * Setup initial stack pointer
 601  */
 602         lea     %pc@(_stext),%sp
 603
 604 /*
 605  * Record the CPU and machine type.
 606  */
 607         get_bi_record   BI_MACHTYPE
 608         lea     %pc@(m68k_machtype),%a1
 609         movel   %a0@,%a1@
 610
 611         get_bi_record   BI_FPUTYPE
 612         lea     %pc@(m68k_fputype),%a1
 613         movel   %a0@,%a1@
 614
 615         get_bi_record   BI_MMUTYPE
 616         lea     %pc@(m68k_mmutype),%a1
 617         movel   %a0@,%a1@
 618
 619         get_bi_record   BI_CPUTYPE
 620         lea     %pc@(m68k_cputype),%a1
 621         movel   %a0@,%a1@
 622
 623         leds    0x1
 624
 625 #ifdef CONFIG_MAC
 626 /*
 627  * For Macintosh, we need to determine the display parameters early (at least
 628  * while debugging it).
 629  */
 630
 631         is_not_mac(L(test_notmac))
 632
 633         get_bi_record   BI_MAC_VADDR
 634         lea     %pc@(L(mac_videobase)),%a1
 635         movel   %a0@,%a1@
 636
 637         get_bi_record   BI_MAC_VDEPTH
 638         lea     %pc@(L(mac_videodepth)),%a1
 639         movel   %a0@,%a1@
 640
 641         get_bi_record   BI_MAC_VDIM
 642         lea     %pc@(L(mac_dimensions)),%a1
 643         movel   %a0@,%a1@
 644
 645         get_bi_record   BI_MAC_VROW
 646         lea     %pc@(L(mac_rowbytes)),%a1
 647         movel   %a0@,%a1@
 648
 649 #ifdef SERIAL_DEBUG
 650         get_bi_record   BI_MAC_SCCBASE
 651         lea     %pc@(L(mac_sccbase)),%a1
 652         movel   %a0@,%a1@
 653 #endif
 654
 655 #if 0
 656         /*
 657          * Clear the screen
 658          */
 659         lea     %pc@(L(mac_videobase)),%a0
 660         movel   %a0@,%a1
 661         lea     %pc@(L(mac_dimensions)),%a0
 662         movel   %a0@,%d1
 663         swap    %d1             /* #rows is high bytes */
 664         andl    #0xFFFF,%d1     /* rows */
 665         subl    #10,%d1
 666         lea     %pc@(L(mac_rowbytes)),%a0
 667 loopy2:
 668         movel   %a0@,%d0
 669         subql   #1,%d0
 670 loopx2:
 671         moveb   #0x55, %a1@+
 672         dbra    %d0,loopx2
 673         dbra    %d1,loopy2
 674 #endif
 675
 676 L(test_notmac):
 677 #endif /* CONFIG_MAC */
 678
 679
 680 /*
 681  * There are ultimately two pieces of information we want for all kinds of
 682  * processors CpuType and CacheBits.  The CPUTYPE was passed in from booter
 683  * and is converted here from a booter type definition to a separate bit
 684  * number which allows for the standard is_0x0 macro tests.
 685  */
 686         movel   %pc@(m68k_cputype),%d0
 687         /*
 688          * Assume it's an 030
 689          */
 690         clrl    %d1
 691
 692         /*
 693          * Test the BootInfo cputype for 060
 694          */
 695         btst    #CPUB_68060,%d0
 696         jeq     1f
 697         bset    #CPUTYPE_060,%d1
 698         bset    #CPUTYPE_0460,%d1
 699         jra     3f
 700 1:
 701         /*
 702          * Test the BootInfo cputype for 040
 703          */
 704         btst    #CPUB_68040,%d0
 705         jeq     2f
 706         bset    #CPUTYPE_040,%d1
 707         bset    #CPUTYPE_0460,%d1
 708         jra     3f
 709 2:
 710         /*
 711          * Test the BootInfo cputype for 020
 712          */
 713         btst    #CPUB_68020,%d0
 714         jeq     3f
 715         bset    #CPUTYPE_020,%d1
 716         jra     3f
 717 3:
 718         /*
 719          * Record the cpu type
 720          */
 721         lea     %pc@(L(cputype)),%a0
 722         movel   %d1,%a0@
 723
 724         /*
 725          * NOTE:
 726          *
 727          * Now the macros are valid:
 728          *      is_040_or_060
 729          *      is_not_040_or_060
 730          *      is_040
 731          *      is_060
 732          *      is_not_060
 733          */
 734
 735         /*
 736          * Determine the cache mode for pages holding MMU tables
 737          * and for supervisor mode, unused for '020 and '030
 738          */
 739         clrl    %d0
 740         clrl    %d1
 741
 742         is_not_040_or_060(L(save_cachetype))
 743
 744         /*
 745          * '040 or '060
 746          * d1 := cacheable write-through
 747          * NOTE: The 68040 manual strongly recommends non-cached for MMU tables,
 748          * but we have been using write-through since at least 2.0.29 so I
 749          * guess it is OK.
 750          */
 751 #ifdef CONFIG_060_WRITETHROUGH
 752         /*
 753          * If this is a 68060 board using drivers with cache coherency
 754          * problems, then supervisor memory accesses need to be write-through
 755          * also; otherwise, we want copyback.
 756          */
 757
 758         is_not_060(1f)
 759         movel   #_PAGE_CACHE040W,%d0
 760         jra     L(save_cachetype)
 761 #endif /* CONFIG_060_WRITETHROUGH */
 762 1:
 763         movew   #_PAGE_CACHE040,%d0
 764
 765         movel   #_PAGE_CACHE040W,%d1
 766
 767 L(save_cachetype):
 768         /* Save cache mode for supervisor mode and page tables
 769          */
 770         lea     %pc@(m68k_supervisor_cachemode),%a0
 771         movel   %d0,%a0@
 772         lea     %pc@(m68k_pgtable_cachemode),%a0
 773         movel   %d1,%a0@
 774
 775 /*
 776  * raise interrupt level
 777  */
 778         movew   #0x2700,%sr
 779
 780 /*
 781    If running on an Atari, determine the I/O base of the
 782    serial port and test if we are running on a Medusa or Hades.
 783    This test is necessary here, because on the Hades the serial
 784    port is only accessible in the high I/O memory area.
 785
 786    The test whether it is a Medusa is done by writing to the byte at
 787    phys. 0x0. This should result in a bus error on all other machines.
 788
 789    ...should, but doesn't. The Afterburner040 for the Falcon has the
 790    same behaviour (0x0..0x7 are no ROM shadow). So we have to do
 791    another test to distinguish Medusa and AB040. This is a
 792    read attempt for 0x00ff82fe phys. that should bus error on a Falcon
 793    (+AB040), but is in the range where the Medusa always asserts DTACK.
 794
 795    The test for the Hades is done by reading address 0xb0000000. This
 796    should give a bus error on the Medusa.
 797  */
 798
 799 #ifdef CONFIG_ATARI
 800         is_not_atari(L(notypetest))
 801
 802         /* get special machine type (Medusa/Hades/AB40) */
 803         moveq   #0,%d3 /* default if tag doesn't exist */
 804         get_bi_record   BI_ATARI_MCH_TYPE
 805         tstl    %d0
 806         jbmi    1f
 807         movel   %a0@,%d3
 808         lea     %pc@(atari_mch_type),%a0
 809         movel   %d3,%a0@
 810 1:
 811         /* On the Hades, the iobase must be set up before opening the
 812          * serial port. There are no I/O regs at 0x00ffxxxx at all. */
 813         moveq   #0,%d0
 814         cmpl    #ATARI_MACH_HADES,%d3
 815         jbne    1f
 816         movel   #0xff000000,%d0         /* Hades I/O base addr: 0xff000000 */
 817 1:      lea     %pc@(L(iobase)),%a0
 818         movel   %d0,%a0@
 819
 820 L(notypetest):
 821 #endif
 822
 823 #ifdef CONFIG_VME
 824         is_mvme147(L(getvmetype))
 825         is_bvme6000(L(getvmetype))
 826         is_not_mvme16x(L(gvtdone))
 827
 828         /* See if the loader has specified the BI_VME_TYPE tag.  Recent
 829          * versions of VMELILO and TFTPLILO do this.  We have to do this
 830          * early so we know how to handle console output.  If the tag
 831          * doesn't exist then we use the Bug for output on MVME16x.
 832          */
 833 L(getvmetype):
 834         get_bi_record   BI_VME_TYPE
 835         tstl    %d0
 836         jbmi    1f
 837         movel   %a0@,%d3
 838         lea     %pc@(vme_brdtype),%a0
 839         movel   %d3,%a0@
 840 1:
 841 #ifdef CONFIG_MVME16x
 842         is_not_mvme16x(L(gvtdone))
 843
 844         /* Need to get the BRD_ID info to differentiate between 162, 167,
 845          * etc.  This is available as a BI_VME_BRDINFO tag with later
 846          * versions of VMELILO and TFTPLILO, otherwise we call the Bug.
 847          */
 848         get_bi_record   BI_VME_BRDINFO
 849         tstl    %d0
 850         jpl     1f
 851
 852         /* Get pointer to board ID data from Bug */
 853         movel   %d2,%sp@-
 854         trap    #15
 855         .word   0x70            /* trap 0x70 - .BRD_ID */
 856         movel   %sp@+,%a0
 857 1:
 858         lea     %pc@(mvme_bdid),%a1
 859         /* Structure is 32 bytes long */
 860         movel   %a0@+,%a1@+
 861         movel   %a0@+,%a1@+
 862         movel   %a0@+,%a1@+
 863         movel   %a0@+,%a1@+
 864         movel   %a0@+,%a1@+
 865         movel   %a0@+,%a1@+
 866         movel   %a0@+,%a1@+
 867         movel   %a0@+,%a1@+
 868 #endif
 869
 870 L(gvtdone):
 871
 872 #endif
 873
 874 #ifdef CONFIG_HP300
 875         is_not_hp300(L(nothp))
 876
 877         /* Get the address of the UART for serial debugging */
 878         get_bi_record   BI_HP300_UART_ADDR
 879         tstl    %d0
 880         jbmi    1f
 881         movel   %a0@,%d3
 882         lea     %pc@(L(uartbase)),%a0
 883         movel   %d3,%a0@
 884         get_bi_record   BI_HP300_UART_SCODE
 885         tstl    %d0
 886         jbmi    1f
 887         movel   %a0@,%d3
 888         lea     %pc@(L(uart_scode)),%a0
 889         movel   %d3,%a0@
 890 1:
 891 L(nothp):
 892 #endif
 893
 894 /*
 895  * Initialize serial port
 896  */
 897         jbsr    L(serial_init)
 898
 899 /*
 900  * Initialize console
 901  */
 902 #ifdef CONFIG_MAC
 903         is_not_mac(L(nocon))
 904 #ifdef CONSOLE
 905         console_init
 906 #ifdef CONSOLE_PENGUIN
 907         console_put_penguin
 908 #endif  /* CONSOLE_PENGUIN */
 909         console_put_stats
 910 #endif  /* CONSOLE */
 911 L(nocon):
 912 #endif  /* CONFIG_MAC */
 913
 914
 915         putc    '\n'
 916         putc    'A'
 917         leds    0x2
 918         dputn   %pc@(L(cputype))
 919         dputn   %pc@(m68k_supervisor_cachemode)
 920         dputn   %pc@(m68k_pgtable_cachemode)
 921         dputc   '\n'
 922
 923 /*
 924  * Save physical start address of kernel
 925  */
 926         lea     %pc@(L(phys_kernel_start)),%a0
 927         lea     %pc@(_stext),%a1
 928         subl    #_stext,%a1
 929         addl    #PAGE_OFFSET,%a1
 930         movel   %a1,%a0@
 931
 932         putc    'B'
 933
 934         leds    0x4
 935
 936 /*
 937  *      mmu_init
 938  *
 939  *      This block of code does what's necessary to map in the various kinds
 940  *      of machines for execution of Linux.
 941  *      First map the first 4 MB of kernel code & data
 942  */
 943
 944         mmu_map #PAGE_OFFSET,%pc@(L(phys_kernel_start)),#4*1024*1024,\
 945                 %pc@(m68k_supervisor_cachemode)
 946
 947         putc    'C'
 948
 949 #ifdef CONFIG_AMIGA
 950
 951 L(mmu_init_amiga):
 952
 953         is_not_amiga(L(mmu_init_not_amiga))
 954 /*
 955  * mmu_init_amiga
 956  */
 957
 958         putc    'D'
 959
 960         is_not_040_or_060(1f)
 961
 962         /*
 963          * 040: Map the 16Meg range physical 0x0 up to logical 0x8000.0000
 964          */
 965         mmu_map         #0x80000000,#0,#0x01000000,#_PAGE_NOCACHE_S
 966         /*
 967          * Map the Zorro III I/O space with transparent translation
 968          * for frame buffer memory etc.
 969          */
 970         mmu_map_tt      #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE_S
 971
 972         jbra    L(mmu_init_done)
 973
 974 1:
 975         /*
 976          * 030: Map the 32Meg range physical 0x0 up to logical 0x8000.0000
 977          */
 978         mmu_map         #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
 979         mmu_map_tt      #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE030
 980
 981         jbra    L(mmu_init_done)
 982
 983 L(mmu_init_not_amiga):
 984 #endif
 985
 986 #ifdef CONFIG_ATARI
 987
 988 L(mmu_init_atari):
 989
 990         is_not_atari(L(mmu_init_not_atari))
 991
 992         putc    'E'
 993
 994 /* On the Atari, we map the I/O region (phys. 0x00ffxxxx) by mapping
 995    the last 16 MB of virtual address space to the first 16 MB (i.e.
 996    0xffxxxxxx -> 0x00xxxxxx). For this, an additional pointer table is
 997    needed. I/O ranges are marked non-cachable.
 998
 999    For the Medusa it is better to map the I/O region transparently
1000    (i.e. 0xffxxxxxx -> 0xffxxxxxx), because some I/O registers are
1001    accessible only in the high area.
1002
1003    On the Hades all I/O registers are only accessible in the high
1004    area.
1005 */
1006
1007         /* I/O base addr for non-Medusa, non-Hades: 0x00000000 */
1008         moveq   #0,%d0
1009         movel   %pc@(atari_mch_type),%d3
1010         cmpl    #ATARI_MACH_MEDUSA,%d3
1011         jbeq    2f
1012         cmpl    #ATARI_MACH_HADES,%d3
1013         jbne    1f
1014 2:      movel   #0xff000000,%d0 /* Medusa/Hades base addr: 0xff000000 */
1015 1:      movel   %d0,%d3
1016
1017         is_040_or_060(L(spata68040))
1018
1019         /* Map everything non-cacheable, though not all parts really
1020          * need to disable caches (crucial only for 0xff8000..0xffffff
1021          * (standard I/O) and 0xf00000..0xf3ffff (IDE)). The remainder
1022          * isn't really used, except for sometimes peeking into the
1023          * ROMs (mirror at phys. 0x0), so caching isn't necessary for
1024          * this. */
1025         mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE030
1026
1027         jbra    L(mmu_init_done)
1028
1029 L(spata68040):
1030
1031         mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE_S
1032
1033         jbra    L(mmu_init_done)
1034
1035 L(mmu_init_not_atari):
1036 #endif
1037
1038 #ifdef CONFIG_Q40
1039         is_not_q40(L(notq40))
1040         /*
1041          * add transparent mapping for 0xff00 0000 - 0xffff ffff
1042          * non-cached serialized etc..
1043          * this includes master chip, DAC, RTC and ISA ports
1044          * 0xfe000000-0xfeffffff is for screen and ROM
1045          */
1046
1047         putc    'Q'
1048
1049         mmu_map_tt      #0,#0xfe000000,#0x01000000,#_PAGE_CACHE040W
1050         mmu_map_tt      #1,#0xff000000,#0x01000000,#_PAGE_NOCACHE_S
1051
1052         jbra    L(mmu_init_done)
1053
1054 L(notq40):
1055 #endif
1056
1057 #ifdef CONFIG_HP300
1058         is_not_hp300(L(nothp300))
1059
1060         /* On the HP300, we map the ROM, INTIO and DIO regions (phys. 0x00xxxxxx)
1061          * by mapping 32MB (on 020/030) or 16 MB (on 040) from 0xf0xxxxxx -> 0x00xxxxxx).
1062          * The ROM mapping is needed because the LEDs are mapped there too.
1063          */
1064
1065         is_040(1f)
1066
1067         /*
1068          * 030: Map the 32Meg range physical 0x0 up to logical 0xf000.0000
1069          */
1070         mmu_map #0xf0000000,#0,#0x02000000,#_PAGE_NOCACHE030
1071
1072         jbra    L(mmu_init_done)
1073
1074 1:
1075         /*
1076          * 040: Map the 16Meg range physical 0x0 up to logical 0xf000.0000
1077          */
1078         mmu_map #0xf0000000,#0,#0x01000000,#_PAGE_NOCACHE_S
1079
1080         jbra    L(mmu_init_done)
1081
1082 L(nothp300):
1083 #endif /* CONFIG_HP300 */
1084
1085 #ifdef CONFIG_MVME147
1086
1087         is_not_mvme147(L(not147))
1088
1089         /*
1090          * On MVME147 we have already created kernel page tables for
1091          * 4MB of RAM at address 0, so now need to do a transparent
1092          * mapping of the top of memory space.  Make it 0.5GByte for now,
1093          * so we can access on-board i/o areas.
1094          */
1095
1096         mmu_map_tt      #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE030
1097
1098         jbra    L(mmu_init_done)
1099
1100 L(not147):
1101 #endif /* CONFIG_MVME147 */
1102
1103 #ifdef CONFIG_MVME16x
1104
1105         is_not_mvme16x(L(not16x))
1106
1107         /*
1108          * On MVME16x we have already created kernel page tables for
1109          * 4MB of RAM at address 0, so now need to do a transparent
1110          * mapping of the top of memory space.  Make it 0.5GByte for now.
1111          * Supervisor only access, so transparent mapping doesn't
1112          * clash with User code virtual address space.
1113          * this covers IO devices, PROM and SRAM.  The PROM and SRAM
1114          * mapping is needed to allow 167Bug to run.
1115          * IO is in the range 0xfff00000 to 0xfffeffff.
1116          * PROM is 0xff800000->0xffbfffff and SRAM is
1117          * 0xffe00000->0xffe1ffff.
1118          */
1119
1120         mmu_map_tt      #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
1121
1122         jbra    L(mmu_init_done)
1123
1124 L(not16x):
1125 #endif  /* CONFIG_MVME162 | CONFIG_MVME167 */
1126
1127 #ifdef CONFIG_BVME6000
1128
1129         is_not_bvme6000(L(not6000))
1130
1131         /*
1132          * On BVME6000 we have already created kernel page tables for
1133          * 4MB of RAM at address 0, so now need to do a transparent
1134          * mapping of the top of memory space.  Make it 0.5GByte for now,
1135          * so we can access on-board i/o areas.
1136          * Supervisor only access, so transparent mapping doesn't
1137          * clash with User code virtual address space.
1138          */
1139
1140         mmu_map_tt      #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
1141
1142         jbra    L(mmu_init_done)
1143
1144 L(not6000):
1145 #endif /* CONFIG_BVME6000 */
1146
1147 /*
1148  * mmu_init_mac
1149  *
1150  * The Macintosh mappings are less clear.
1151  *
1152  * Even as of this writing, it is unclear how the
1153  * Macintosh mappings will be done.  However, as
1154  * the first author of this code I'm proposing the
1155  * following model:
1156  *
1157  * Map the kernel (that's already done),
1158  * Map the I/O (on most machines that's the
1159  * 0x5000.0000 ... 0x5300.0000 range,
1160  * Map the video frame buffer using as few pages
1161  * as absolutely (this requirement mostly stems from
1162  * the fact that when the frame buffer is at
1163  * 0x0000.0000 then we know there is valid RAM just
1164  * above the screen that we don't want to waste!).
1165  *
1166  * By the way, if the frame buffer is at 0x0000.0000
1167  * then the Macintosh is known as an RBV based Mac.
1168  *
1169  * By the way 2, the code currently maps in a bunch of
1170  * regions.  But I'd like to cut that out.  (And move most
1171  * of the mappings up into the kernel proper ... or only
1172  * map what's necessary.)
1173  */
1174
1175 #ifdef CONFIG_MAC
1176
1177 L(mmu_init_mac):
1178
1179         is_not_mac(L(mmu_init_not_mac))
1180
1181         putc    'F'
1182
1183         is_not_040_or_060(1f)
1184
1185         moveq   #_PAGE_NOCACHE_S,%d3
1186         jbra    2f
1187 1:
1188         moveq   #_PAGE_NOCACHE030,%d3
1189 2:
1190         /*
1191          * Mac Note: screen address of logical 0xF000.0000 -> <screen physical>
1192          *           we simply map the 4MB that contains the videomem
1193          */
1194
1195         movel   #VIDEOMEMMASK,%d0
1196         andl    %pc@(L(mac_videobase)),%d0
1197
1198         mmu_map         #VIDEOMEMBASE,%d0,#VIDEOMEMSIZE,%d3
1199         /* ROM from 4000 0000 to 4200 0000 (only for mac_reset()) */
1200         mmu_map_eq      #0x40000000,#0x02000000,%d3
1201         /* IO devices (incl. serial port) from 5000 0000 to 5300 0000 */
1202         mmu_map_eq      #0x50000000,#0x03000000,%d3
1203         /* Nubus slot space (video at 0xF0000000, rom at 0xF0F80000) */
1204         mmu_map_tt      #1,#0xf8000000,#0x08000000,%d3
1205
1206         jbra    L(mmu_init_done)
1207
1208 L(mmu_init_not_mac):
1209 #endif
1210
1211 #ifdef CONFIG_SUN3X
1212         is_not_sun3x(L(notsun3x))
1213
1214         /* oh, the pain..  We're gonna want the prom code after
1215          * starting the MMU, so we copy the mappings, translating
1216          * from 8k -> 4k pages as we go.
1217          */
1218
1219         /* copy maps from 0xfee00000 to 0xff000000 */
1220         movel   #0xfee00000, %d0
1221         moveq   #ROOT_INDEX_SHIFT, %d1
1222         lsrl    %d1,%d0
1223         mmu_get_root_table_entry        %d0
1224
1225         movel   #0xfee00000, %d0
1226         moveq   #PTR_INDEX_SHIFT, %d1
1227         lsrl    %d1,%d0
1228         andl    #PTR_TABLE_SIZE-1, %d0
1229         mmu_get_ptr_table_entry         %a0,%d0
1230
1231         movel   #0xfee00000, %d0
1232         moveq   #PAGE_INDEX_SHIFT, %d1
1233         lsrl    %d1,%d0
1234         andl    #PAGE_TABLE_SIZE-1, %d0
1235         mmu_get_page_table_entry        %a0,%d0
1236
1237         /* this is where the prom page table lives */
1238         movel   0xfefe00d4, %a1
1239         movel   %a1@, %a1
1240
1241         movel   #((0x200000 >> 13)-1), %d1
1242
1243 1:
1244         movel   %a1@+, %d3
1245         movel   %d3,%a0@+
1246         addl    #0x1000,%d3
1247         movel   %d3,%a0@+
1248
1249         dbra    %d1,1b
1250
1251         /* setup tt1 for I/O */
1252         mmu_map_tt      #1,#0x40000000,#0x40000000,#_PAGE_NOCACHE_S
1253         jbra    L(mmu_init_done)
1254
1255 L(notsun3x):
1256 #endif
1257
1258 #ifdef CONFIG_APOLLO
1259         is_not_apollo(L(notapollo))
1260
1261         putc    'P'
1262         mmu_map         #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
1263
1264 L(notapollo):
1265         jbra    L(mmu_init_done)
1266 #endif
1267
1268 L(mmu_init_done):
1269
1270         putc    'G'
1271         leds    0x8
1272
1273 /*
1274  * mmu_fixup
1275  *
1276  * On the 040 class machines, all pages that are used for the
1277  * mmu have to be fixed up. According to Motorola, pages holding mmu
1278  * tables should be non-cacheable on a '040 and write-through on a
1279  * '060. But analysis of the reasons for this, and practical
1280  * experience, showed that write-through also works on a '040.
1281  *
1282  * Allocated memory so far goes from kernel_end to memory_start that
1283  * is used for all kind of tables, for that the cache attributes
1284  * are now fixed.
1285  */
1286 L(mmu_fixup):
1287
1288         is_not_040_or_060(L(mmu_fixup_done))
1289
1290 #ifdef MMU_NOCACHE_KERNEL
1291         jbra    L(mmu_fixup_done)
1292 #endif
1293
1294         /* first fix the page at the start of the kernel, that
1295          * contains also kernel_pg_dir.
1296          */
1297         movel   %pc@(L(phys_kernel_start)),%d0
1298         subl    #PAGE_OFFSET,%d0
1299         lea     %pc@(_stext),%a0
1300         subl    %d0,%a0
1301         mmu_fixup_page_mmu_cache        %a0
1302
1303         movel   %pc@(L(kernel_end)),%a0
1304         subl    %d0,%a0
1305         movel   %pc@(L(memory_start)),%a1
1306         subl    %d0,%a1
1307         bra     2f
1308 1:
1309         mmu_fixup_page_mmu_cache        %a0
1310         addw    #PAGESIZE,%a0
1311 2:
1312         cmpl    %a0,%a1
1313         jgt     1b
1314
1315 L(mmu_fixup_done):
1316
1317 #ifdef MMU_PRINT
1318         mmu_print
1319 #endif
1320
1321 /*
1322  * mmu_engage
1323  *
1324  * This chunk of code performs the gruesome task of engaging the MMU.
1325  * The reason its gruesome is because when the MMU becomes engaged it
1326  * maps logical addresses to physical addresses.  The Program Counter
1327  * register is then passed through the MMU before the next instruction
1328  * is fetched (the instruction following the engage MMU instruction).
1329  * This may mean one of two things:
1330  * 1. The Program Counter falls within the logical address space of
1331  *    the kernel of which there are two sub-possibilities:
1332  *    A. The PC maps to the correct instruction (logical PC == physical
1333  *       code location), or
1334  *    B. The PC does not map through and the processor will read some
1335  *       data (or instruction) which is not the logically next instr.
1336  *    As you can imagine, A is good and B is bad.
1337  * Alternatively,
1338  * 2. The Program Counter does not map through the MMU.  The processor
1339  *    will take a Bus Error.
1340  * Clearly, 2 is bad.
1341  * It doesn't take a wiz kid to figure you want 1.A.
1342  * This code creates that possibility.
1343  * There are two possible 1.A. states (we now ignore the other above states):
1344  * A. The kernel is located at physical memory addressed the same as
1345  *    the logical memory for the kernel, i.e., 0x01000.
1346  * B. The kernel is located some where else.  e.g., 0x0400.0000
1347  *
1348  *    Under some conditions the Macintosh can look like A or B.
1349  * [A friend and I once noted that Apple hardware engineers should be
1350  * wacked twice each day: once when they show up at work (as in, Whack!,
1351  * "This is for the screwy hardware we know you're going to design today."),
1352  * and also at the end of the day (as in, Whack! "I don't know what
1353  * you designed today, but I'm sure it wasn't good."). -- rst]
1354  *
1355  * This code works on the following premise:
1356  * If the kernel start (%d5) is within the first 16 Meg of RAM,
1357  * then create a mapping for the kernel at logical 0x8000.0000 to
1358  * the physical location of the pc.  And, create a transparent
1359  * translation register for the first 16 Meg.  Then, after the MMU
1360  * is engaged, the PC can be moved up into the 0x8000.0000 range
1361  * and then the transparent translation can be turned off and then
1362  * the PC can jump to the correct logical location and it will be
1363  * home (finally).  This is essentially the code that the Amiga used
1364  * to use.  Now, it's generalized for all processors.  Which means
1365  * that a fresh (but temporary) mapping has to be created.  The mapping
1366  * is made in page 0 (an as of yet unused location -- except for the
1367  * stack!).  This temporary mapping will only require 1 pointer table
1368  * and a single page table (it can map 256K).
1369  *
1370  * OK, alternatively, imagine that the Program Counter is not within
1371  * the first 16 Meg.  Then, just use Transparent Translation registers
1372  * to do the right thing.
1373  *
1374  * Last, if _start is already at 0x01000, then there's nothing special
1375  * to do (in other words, in a degenerate case of the first case above,
1376  * do nothing).
1377  *
1378  * Let's do it.
1379  *
1380  *
1381  */
1382
1383         putc    'H'
1384
1385         mmu_engage
1386
1387 /*
1388  * After this point no new memory is allocated and
1389  * the start of available memory is stored in availmem.
1390  * (The bootmem allocator requires now the physicall address.)
1391  */
1392
1393         movel   L(memory_start),availmem
1394
1395 #ifdef CONFIG_AMIGA
1396         is_not_amiga(1f)
1397         /* fixup the Amiga custom register location before printing */
1398         clrl    L(custom)
1399 1:
1400 #endif
1401
1402 #ifdef CONFIG_ATARI
1403         is_not_atari(1f)
1404         /* fixup the Atari iobase register location before printing */
1405         movel   #0xff000000,L(iobase)
1406 1:
1407 #endif
1408
1409 #ifdef CONFIG_MAC
1410         is_not_mac(1f)
1411         movel   #~VIDEOMEMMASK,%d0
1412         andl    L(mac_videobase),%d0
1413         addl    #VIDEOMEMBASE,%d0
1414         movel   %d0,L(mac_videobase)
1415 #if defined(CONSOLE)
1416         movel   %pc@(L(phys_kernel_start)),%d0
1417         subl    #PAGE_OFFSET,%d0
1418         subl    %d0,L(console_font)
1419         subl    %d0,L(console_font_data)
1420 #endif
1421 #ifdef SERIAL_DEBUG
1422         orl     #0x50000000,L(mac_sccbase)
1423 #endif
1424 1:
1425 #endif
1426
1427 #ifdef CONFIG_HP300
1428         is_not_hp300(2f)
1429         /*
1430          * Fix up the iobase register to point to the new location of the LEDs.
1431          */
1432         movel   #0xf0000000,L(iobase)
1433
1434         /*
1435          * Energise the FPU and caches.
1436          */
1437         is_040(1f)
1438         movel   #0x60,0xf05f400c
1439         jbra    2f
1440
1441         /*
1442          * 040: slightly different, apparently.
1443          */
1444 1:      movew   #0,0xf05f400e
1445         movew   #0x64,0xf05f400e
1446 2:
1447 #endif
1448
1449 #ifdef CONFIG_SUN3X
1450         is_not_sun3x(1f)
1451
1452         /* enable copro */
1453         oriw    #0x4000,0x61000000
1454 1:
1455 #endif
1456
1457 #ifdef CONFIG_APOLLO
1458         is_not_apollo(1f)
1459
1460         /*
1461          * Fix up the iobase before printing
1462          */
1463         movel   #0x80000000,L(iobase)
1464 1:
1465 #endif
1466
1467         putc    'I'
1468         leds    0x10
1469
1470 /*
1471  * Enable caches
1472  */
1473
1474         is_not_040_or_060(L(cache_not_680460))
1475
1476 L(cache680460):
1477         .chip   68040
1478         nop
1479         cpusha  %bc
1480         nop
1481
1482         is_060(L(cache68060))
1483
1484         movel   #CC6_ENABLE_D+CC6_ENABLE_I,%d0
1485         /* MMU stuff works in copyback mode now, so enable the cache */
1486         movec   %d0,%cacr
1487         jra     L(cache_done)
1488
1489 L(cache68060):
1490         movel   #CC6_ENABLE_D+CC6_ENABLE_I+CC6_ENABLE_SB+CC6_PUSH_DPI+CC6_ENABLE_B+CC6_CLRA_B,%d0
1491         /* MMU stuff works in copyback mode now, so enable the cache */
1492         movec   %d0,%cacr
1493         /* enable superscalar dispatch in PCR */
1494         moveq   #1,%d0
1495         .chip   68060
1496         movec   %d0,%pcr
1497
1498         jbra    L(cache_done)
1499 L(cache_not_680460):
1500 L(cache68030):
1501         .chip   68030
1502         movel   #CC3_ENABLE_DB+CC3_CLR_D+CC3_ENABLE_D+CC3_ENABLE_IB+CC3_CLR_I+CC3_ENABLE_I,%d0
1503         movec   %d0,%cacr
1504
1505         jra     L(cache_done)
1506         .chip   68k
1507 L(cache_done):
1508
1509         putc    'J'
1510
1511 /*
1512  * Setup initial stack pointer
1513  */
1514         lea     init_task,%curptr
1515         lea     init_thread_union+THREAD_SIZE,%sp
1516
1517         putc    'K'
1518
1519         subl    %a6,%a6         /* clear a6 for gdb */
1520
1521 /*
1522  * The new 64bit printf support requires an early exception initialization.
1523  */
1524         jbsr    base_trap_init
1525
1526 /* jump to the kernel start */
1527
1528         putc    '\n'
1529         leds    0x55
1530
1531         jbsr    start_kernel
1532
1533 /*
1534  * Find a tag record in the bootinfo structure
1535  * The bootinfo structure is located right after the kernel bss
1536  * Returns: d0: size (-1 if not found)
1537  *          a0: data pointer (end-of-records if not found)
1538  */
1539 func_start      get_bi_record,%d1
1540
1541         movel   ARG1,%d0
1542         lea     %pc@(_end),%a0
1543 1:      tstw    %a0@(BIR_TAG)
1544         jeq     3f
1545         cmpw    %a0@(BIR_TAG),%d0
1546         jeq     2f
1547         addw    %a0@(BIR_SIZE),%a0
1548         jra     1b
1549 2:      moveq   #0,%d0
1550         movew   %a0@(BIR_SIZE),%d0
1551         lea     %a0@(BIR_DATA),%a0
1552         jra     4f
1553 3:      moveq   #-1,%d0
1554         lea     %a0@(BIR_SIZE),%a0
1555 4:
1556 func_return     get_bi_record
1557
1558
1559 /*
1560  *      MMU Initialization Begins Here
1561  *
1562  *      The structure of the MMU tables on the 68k machines
1563  *      is thus:
1564  *      Root Table
1565  *              Logical addresses are translated through
1566  *      a hierarchical translation mechanism where the high-order
1567  *      seven bits of the logical address (LA) are used as an
1568  *      index into the "root table."  Each entry in the root
1569  *      table has a bit which specifies if it's a valid pointer to a
1570  *      pointer table.  Each entry defines a 32KMeg range of memory.
1571  *      If an entry is invalid then that logical range of 32M is
1572  *      invalid and references to that range of memory (when the MMU
1573  *      is enabled) will fault.  If the entry is valid, then it does
1574  *      one of two things.  On 040/060 class machines, it points to
1575  *      a pointer table which then describes more finely the memory
1576  *      within that 32M range.  On 020/030 class machines, a technique
1577  *      called "early terminating descriptors" are used.  This technique
1578  *      allows an entire 32Meg to be described by a single entry in the
1579  *      root table.  Thus, this entry in the root table, contains the
1580  *      physical address of the memory or I/O at the logical address
1581  *      which the entry represents and it also contains the necessary
1582  *      cache bits for this region.
1583  *
1584  *      Pointer Tables
1585  *              Per the Root Table, there will be one or more
1586  *      pointer tables.  Each pointer table defines a 32M range.
1587  *      Not all of the 32M range need be defined.  Again, the next
1588  *      seven bits of the logical address are used an index into
1589  *      the pointer table to point to page tables (if the pointer
1590  *      is valid).  There will undoubtedly be more than one
1591  *      pointer table for the kernel because each pointer table
1592  *      defines a range of only 32M.  Valid pointer table entries
1593  *      point to page tables, or are early terminating entries
1594  *      themselves.
1595  *
1596  *      Page Tables
1597  *              Per the Pointer Tables, each page table entry points
1598  *      to the physical page in memory that supports the logical
1599  *      address that translates to the particular index.
1600  *
1601  *      In short, the Logical Address gets translated as follows:
1602  *              bits 31..26 - index into the Root Table
1603  *              bits 25..18 - index into the Pointer Table
1604  *              bits 17..12 - index into the Page Table
1605  *              bits 11..0  - offset into a particular 4K page
1606  *
1607  *      The algorithms which follows do one thing: they abstract
1608  *      the MMU hardware.  For example, there are three kinds of
1609  *      cache settings that are relevant.  Either, memory is
1610  *      being mapped in which case it is either Kernel Code (or
1611  *      the RamDisk) or it is MMU data.  On the 030, the MMU data
1612  *      option also describes the kernel.  Or, I/O is being mapped
1613  *      in which case it has its own kind of cache bits.  There
1614  *      are constants which abstract these notions from the code that
1615  *      actually makes the call to map some range of memory.
1616  *
1617  *
1618  *
1619  */
1620
1621 #ifdef MMU_PRINT
1622 /*
1623  *      mmu_print
1624  *
1625  *      This algorithm will print out the current MMU mappings.
1626  *
1627  *      Input:
1628  *              %a5 points to the root table.  Everything else is calculated
1629  *                      from this.
1630  */
1631
1632 #define mmu_next_valid          0
1633 #define mmu_start_logical       4
1634 #define mmu_next_logical        8
1635 #define mmu_start_physical      12
1636 #define mmu_next_physical       16
1637
1638 #define MMU_PRINT_INVALID               -1
1639 #define MMU_PRINT_VALID                 1
1640 #define MMU_PRINT_UNINITED              0
1641
1642 #define putZc(z,n)              jbne 1f; putc z; jbra 2f; 1: putc n; 2:
1643
1644 func_start      mmu_print,%a0-%a6/%d0-%d7
1645
1646         movel   %pc@(L(kernel_pgdir_ptr)),%a5
1647         lea     %pc@(L(mmu_print_data)),%a0
1648         movel   #MMU_PRINT_UNINITED,%a0@(mmu_next_valid)
1649
1650         is_not_040_or_060(mmu_030_print)
1651
1652 mmu_040_print:
1653         puts    "\nMMU040\n"
1654         puts    "rp:"
1655         putn    %a5
1656         putc    '\n'
1657 #if 0
1658         /*
1659          * The following #if/#endif block is a tight algorithm for dumping the 040
1660          * MMU Map in gory detail.  It really isn't that practical unless the
1661          * MMU Map algorithm appears to go awry and you need to debug it at the
1662          * entry per entry level.
1663          */
1664         movel   #ROOT_TABLE_SIZE,%d5
1665 #if 0
1666         movel   %a5@+,%d7               | Burn an entry to skip the kernel mappings,
1667         subql   #1,%d5                  | they (might) work
1668 #endif
1669 1:      tstl    %d5
1670         jbeq    mmu_print_done
1671         subq    #1,%d5
1672         movel   %a5@+,%d7
1673         btst    #1,%d7
1674         jbeq    1b
1675
1676 2:      putn    %d7
1677         andil   #0xFFFFFE00,%d7
1678         movel   %d7,%a4
1679         movel   #PTR_TABLE_SIZE,%d4
1680         putc    ' '
1681 3:      tstl    %d4
1682         jbeq    11f
1683         subq    #1,%d4
1684         movel   %a4@+,%d7
1685         btst    #1,%d7
1686         jbeq    3b
1687
1688 4:      putn    %d7
1689         andil   #0xFFFFFF00,%d7
1690         movel   %d7,%a3
1691         movel   #PAGE_TABLE_SIZE,%d3
1692 5:      movel   #8,%d2
1693 6:      tstl    %d3
1694         jbeq    31f
1695         subq    #1,%d3
1696         movel   %a3@+,%d6
1697         btst    #0,%d6
1698         jbeq    6b
1699 7:      tstl    %d2
1700         jbeq    8f
1701         subq    #1,%d2
1702         putc    ' '
1703         jbra    91f
1704 8:      putc    '\n'
1705         movel   #8+1+8+1+1,%d2
1706 9:      putc    ' '
1707         dbra    %d2,9b
1708         movel   #7,%d2
1709 91:     putn    %d6
1710         jbra    6b
1711
1712 31:     putc    '\n'
1713         movel   #8+1,%d2
1714 32:     putc    ' '
1715         dbra    %d2,32b
1716         jbra    3b
1717
1718 11:     putc    '\n'
1719         jbra    1b
1720 #endif /* MMU 040 Dumping code that's gory and detailed */
1721
1722         lea     %pc@(kernel_pg_dir),%a5
1723         movel   %a5,%a0                 /* a0 has the address of the root table ptr */
1724         movel   #0x00000000,%a4         /* logical address */
1725         moveql  #0,%d0
1726 40:
1727         /* Increment the logical address and preserve in d5 */
1728         movel   %a4,%d5
1729         addil   #PAGESIZE<<13,%d5
1730         movel   %a0@+,%d6
1731         btst    #1,%d6
1732         jbne    41f
1733         jbsr    mmu_print_tuple_invalidate
1734         jbra    48f
1735 41:
1736         movel   #0,%d1
1737         andil   #0xfffffe00,%d6
1738         movel   %d6,%a1
1739 42:
1740         movel   %a4,%d5
1741         addil   #PAGESIZE<<6,%d5
1742         movel   %a1@+,%d6
1743         btst    #1,%d6
1744         jbne    43f
1745         jbsr    mmu_print_tuple_invalidate
1746         jbra    47f
1747 43:
1748         movel   #0,%d2
1749         andil   #0xffffff00,%d6
1750         movel   %d6,%a2
1751 44:
1752         movel   %a4,%d5
1753         addil   #PAGESIZE,%d5
1754         movel   %a2@+,%d6
1755         btst    #0,%d6
1756         jbne    45f
1757         jbsr    mmu_print_tuple_invalidate
1758         jbra    46f
1759 45:
1760         moveml  %d0-%d1,%sp@-
1761         movel   %a4,%d0
1762         movel   %d6,%d1
1763         andil   #0xfffff4e0,%d1
1764         lea     %pc@(mmu_040_print_flags),%a6
1765         jbsr    mmu_print_tuple
1766         moveml  %sp@+,%d0-%d1
1767 46:
1768         movel   %d5,%a4
1769         addq    #1,%d2
1770         cmpib   #64,%d2
1771         jbne    44b
1772 47:
1773         movel   %d5,%a4
1774         addq    #1,%d1
1775         cmpib   #128,%d1
1776         jbne    42b
1777 48:
1778         movel   %d5,%a4                 /* move to the next logical address */
1779         addq    #1,%d0
1780         cmpib   #128,%d0
1781         jbne    40b
1782
1783         .chip   68040
1784         movec   %dtt1,%d0
1785         movel   %d0,%d1
1786         andiw   #0x8000,%d1             /* is it valid ? */
1787         jbeq    1f                      /* No, bail out */
1788
1789         movel   %d0,%d1
1790         andil   #0xff000000,%d1         /* Get the address */
1791         putn    %d1
1792         puts    "=="
1793         putn    %d1
1794
1795         movel   %d0,%d6
1796         jbsr    mmu_040_print_flags_tt
1797 1:
1798         movec   %dtt0,%d0
1799         movel   %d0,%d1
1800         andiw   #0x8000,%d1             /* is it valid ? */
1801         jbeq    1f                      /* No, bail out */
1802
1803         movel   %d0,%d1
1804         andil   #0xff000000,%d1         /* Get the address */
1805         putn    %d1
1806         puts    "=="
1807         putn    %d1
1808
1809         movel   %d0,%d6
1810         jbsr    mmu_040_print_flags_tt
1811 1:
1812         .chip   68k
1813
1814         jbra    mmu_print_done
1815
1816 mmu_040_print_flags:
1817         btstl   #10,%d6
1818         putZc(' ','G')  /* global bit */
1819         btstl   #7,%d6
1820         putZc(' ','S')  /* supervisor bit */
1821 mmu_040_print_flags_tt:
1822         btstl   #6,%d6
1823         jbne    3f
1824         putc    'C'
1825         btstl   #5,%d6
1826         putZc('w','c')  /* write through or copy-back */
1827         jbra    4f
1828 3:
1829         putc    'N'
1830         btstl   #5,%d6
1831         putZc('s',' ')  /* serialized non-cacheable, or non-cacheable */
1832 4:
1833         rts
1834
1835 mmu_030_print_flags:
1836         btstl   #6,%d6
1837         putZc('C','I')  /* write through or copy-back */
1838         rts
1839
1840 mmu_030_print:
1841         puts    "\nMMU030\n"
1842         puts    "\nrp:"
1843         putn    %a5
1844         putc    '\n'
1845         movel   %a5,%d0
1846         andil   #0xfffffff0,%d0
1847         movel   %d0,%a0
1848         movel   #0x00000000,%a4         /* logical address */
1849         movel   #0,%d0
1850 30:
1851         movel   %a4,%d5
1852         addil   #PAGESIZE<<13,%d5
1853         movel   %a0@+,%d6
1854         btst    #1,%d6                  /* is it a table ptr? */
1855         jbne    31f                     /* yes */
1856         btst    #0,%d6                  /* is it early terminating? */
1857         jbeq    1f                      /* no */
1858         jbsr    mmu_030_print_helper
1859         jbra    38f
1860 1:
1861         jbsr    mmu_print_tuple_invalidate
1862         jbra    38f
1863 31:
1864         movel   #0,%d1
1865         andil   #0xfffffff0,%d6
1866         movel   %d6,%a1
1867 32:
1868         movel   %a4,%d5
1869         addil   #PAGESIZE<<6,%d5
1870         movel   %a1@+,%d6
1871         btst    #1,%d6                  /* is it a table ptr? */
1872         jbne    33f                     /* yes */
1873         btst    #0,%d6                  /* is it a page descriptor? */
1874         jbeq    1f                      /* no */
1875         jbsr    mmu_030_print_helper
1876         jbra    37f
1877 1:
1878         jbsr    mmu_print_tuple_invalidate
1879         jbra    37f
1880 33:
1881         movel   #0,%d2
1882         andil   #0xfffffff0,%d6
1883         movel   %d6,%a2
1884 34:
1885         movel   %a4,%d5
1886         addil   #PAGESIZE,%d5
1887         movel   %a2@+,%d6
1888         btst    #0,%d6
1889         jbne    35f
1890         jbsr    mmu_print_tuple_invalidate
1891         jbra    36f
1892 35:
1893         jbsr    mmu_030_print_helper
1894 36:
1895         movel   %d5,%a4
1896         addq    #1,%d2
1897         cmpib   #64,%d2
1898         jbne    34b
1899 37:
1900         movel   %d5,%a4
1901         addq    #1,%d1
1902         cmpib   #128,%d1
1903         jbne    32b
1904 38:
1905         movel   %d5,%a4                 /* move to the next logical address */
1906         addq    #1,%d0
1907         cmpib   #128,%d0
1908         jbne    30b
1909
1910 mmu_print_done:
1911         puts    "\n"
1912
1913 func_return     mmu_print
1914
1915
1916 mmu_030_print_helper:
1917         moveml  %d0-%d1,%sp@-
1918         movel   %a4,%d0
1919         movel   %d6,%d1
1920         lea     %pc@(mmu_030_print_flags),%a6
1921         jbsr    mmu_print_tuple
1922         moveml  %sp@+,%d0-%d1
1923         rts
1924
1925 mmu_print_tuple_invalidate:
1926         moveml  %a0/%d7,%sp@-
1927
1928         lea     %pc@(L(mmu_print_data)),%a0
1929         tstl    %a0@(mmu_next_valid)
1930         jbmi    mmu_print_tuple_invalidate_exit
1931
1932         movel   #MMU_PRINT_INVALID,%a0@(mmu_next_valid)
1933
1934         putn    %a4
1935
1936         puts    "##\n"
1937
1938 mmu_print_tuple_invalidate_exit:
1939         moveml  %sp@+,%a0/%d7
1940         rts
1941
1942
1943 mmu_print_tuple:
1944         moveml  %d0-%d7/%a0,%sp@-
1945
1946         lea     %pc@(L(mmu_print_data)),%a0
1947
1948         tstl    %a0@(mmu_next_valid)
1949         jble    mmu_print_tuple_print
1950
1951         cmpl    %a0@(mmu_next_physical),%d1
1952         jbeq    mmu_print_tuple_increment
1953
1954 mmu_print_tuple_print:
1955         putn    %d0
1956         puts    "->"
1957         putn    %d1
1958
1959         movel   %d1,%d6
1960         jbsr    %a6@
1961
1962 mmu_print_tuple_record:
1963         movel   #MMU_PRINT_VALID,%a0@(mmu_next_valid)
1964
1965         movel   %d1,%a0@(mmu_next_physical)
1966
1967 mmu_print_tuple_increment:
1968         movel   %d5,%d7
1969         subl    %a4,%d7
1970         addl    %d7,%a0@(mmu_next_physical)
1971
1972 mmu_print_tuple_exit:
1973         moveml  %sp@+,%d0-%d7/%a0
1974         rts
1975
1976 mmu_print_machine_cpu_types:
1977         puts    "machine: "
1978
1979         is_not_amiga(1f)
1980         puts    "amiga"
1981         jbra    9f
1982 1:
1983         is_not_atari(2f)
1984         puts    "atari"
1985         jbra    9f
1986 2:
1987         is_not_mac(3f)
1988         puts    "macintosh"
1989         jbra    9f
1990 3:      puts    "unknown"
1991 9:      putc    '\n'
1992
1993         puts    "cputype: 0"
1994         is_not_060(1f)
1995         putc    '6'
1996         jbra    9f
1997 1:
1998         is_not_040_or_060(2f)
1999         putc    '4'
2000         jbra    9f
2001 2:      putc    '3'
2002 9:      putc    '0'
2003         putc    '\n'
2004
2005         rts
2006 #endif /* MMU_PRINT */
2007
2008 /*
2009  * mmu_map_tt
2010  *
2011  * This is a specific function which works on all 680x0 machines.
2012  * On 030, 040 & 060 it will attempt to use Transparent Translation
2013  * registers (tt1).
2014  * On 020 it will call the standard mmu_map which will use early
2015  * terminating descriptors.
2016  */
2017 func_start      mmu_map_tt,%d0/%d1/%a0,4
2018
2019         dputs   "mmu_map_tt:"
2020         dputn   ARG1
2021         dputn   ARG2
2022         dputn   ARG3
2023         dputn   ARG4
2024         dputc   '\n'
2025
2026         is_020(L(do_map))
2027
2028         /* Extract the highest bit set
2029          */
2030         bfffo   ARG3{#0,#32},%d1
2031         cmpw    #8,%d1
2032         jcc     L(do_map)
2033
2034         /* And get the mask
2035          */
2036         moveq   #-1,%d0
2037         lsrl    %d1,%d0
2038         lsrl    #1,%d0
2039
2040         /* Mask the address
2041          */
2042         movel   %d0,%d1
2043         notl    %d1
2044         andl    ARG2,%d1
2045
2046         /* Generate the upper 16bit of the tt register
2047          */
2048         lsrl    #8,%d0
2049         orl     %d0,%d1
2050         clrw    %d1
2051
2052         is_040_or_060(L(mmu_map_tt_040))
2053
2054         /* set 030 specific bits (read/write access for supervisor mode
2055          * (highest function code set, lower two bits masked))
2056          */
2057         orw     #TTR_ENABLE+TTR_RWM+TTR_FCB2+TTR_FCM1+TTR_FCM0,%d1
2058         movel   ARG4,%d0
2059         btst    #6,%d0
2060         jeq     1f
2061         orw     #TTR_CI,%d1
2062
2063 1:      lea     STACK,%a0
2064         dputn   %d1
2065         movel   %d1,%a0@
2066         .chip   68030
2067         tstl    ARG1
2068         jne     1f
2069         pmove   %a0@,%tt0
2070         jra     2f
2071 1:      pmove   %a0@,%tt1
2072 2:      .chip   68k
2073         jra     L(mmu_map_tt_done)
2074
2075         /* set 040 specific bits
2076          */
2077 L(mmu_map_tt_040):
2078         orw     #TTR_ENABLE+TTR_KERNELMODE,%d1
2079         orl     ARG4,%d1
2080         dputn   %d1
2081
2082         .chip   68040
2083         tstl    ARG1
2084         jne     1f
2085         movec   %d1,%itt0
2086         movec   %d1,%dtt0
2087         jra     2f
2088 1:      movec   %d1,%itt1
2089         movec   %d1,%dtt1
2090 2:      .chip   68k
2091
2092         jra     L(mmu_map_tt_done)
2093
2094 L(do_map):
2095         mmu_map_eq      ARG2,ARG3,ARG4
2096
2097 L(mmu_map_tt_done):
2098
2099 func_return     mmu_map_tt
2100
2101 /*
2102  *      mmu_map
2103  *
2104  *      This routine will map a range of memory using a pointer
2105  *      table and allocating the pages on the fly from the kernel.
2106  *      The pointer table does not have to be already linked into
2107  *      the root table, this routine will do that if necessary.
2108  *
2109  *      NOTE
2110  *      This routine will assert failure and use the serial_putc
2111  *      routines in the case of a run-time error.  For example,
2112  *      if the address is already mapped.
2113  *
2114  *      NOTE-2
2115  *      This routine will use early terminating descriptors
2116  *      where possible for the 68020+68851 and 68030 type
2117  *      processors.
2118  */
2119 func_start      mmu_map,%d0-%d4/%a0-%a4
2120
2121         dputs   "\nmmu_map:"
2122         dputn   ARG1
2123         dputn   ARG2
2124         dputn   ARG3
2125         dputn   ARG4
2126         dputc   '\n'
2127
2128         /* Get logical address and round it down to 256KB
2129          */
2130         movel   ARG1,%d0
2131         andl    #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
2132         movel   %d0,%a3
2133
2134         /* Get the end address
2135          */
2136         movel   ARG1,%a4
2137         addl    ARG3,%a4
2138         subql   #1,%a4
2139
2140         /* Get physical address and round it down to 256KB
2141          */
2142         movel   ARG2,%d0
2143         andl    #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
2144         movel   %d0,%a2
2145
2146         /* Add page attributes to the physical address
2147          */
2148         movel   ARG4,%d0
2149         orw     #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
2150         addw    %d0,%a2
2151
2152         dputn   %a2
2153         dputn   %a3
2154         dputn   %a4
2155
2156         is_not_040_or_060(L(mmu_map_030))
2157
2158         addw    #_PAGE_GLOBAL040,%a2
2159 /*
2160  *      MMU 040 & 060 Support
2161  *
2162  *      The MMU usage for the 040 and 060 is different enough from
2163  *      the 030 and 68851 that there is separate code.  This comment
2164  *      block describes the data structures and algorithms built by
2165  *      this code.
2166  *
2167  *      The 040 does not support early terminating descriptors, as
2168  *      the 030 does.  Therefore, a third level of table is needed
2169  *      for the 040, and that would be the page table.  In Linux,
2170  *      page tables are allocated directly from the memory above the
2171  *      kernel.
2172  *
2173  */
2174
2175 L(mmu_map_040):
2176         /* Calculate the offset into the root table
2177          */
2178         movel   %a3,%d0
2179         moveq   #ROOT_INDEX_SHIFT,%d1
2180         lsrl    %d1,%d0
2181         mmu_get_root_table_entry        %d0
2182
2183         /* Calculate the offset into the pointer table
2184          */
2185         movel   %a3,%d0
2186         moveq   #PTR_INDEX_SHIFT,%d1
2187         lsrl    %d1,%d0
2188         andl    #PTR_TABLE_SIZE-1,%d0
2189         mmu_get_ptr_table_entry         %a0,%d0
2190
2191         /* Calculate the offset into the page table
2192          */
2193         movel   %a3,%d0
2194         moveq   #PAGE_INDEX_SHIFT,%d1
2195         lsrl    %d1,%d0
2196         andl    #PAGE_TABLE_SIZE-1,%d0
2197         mmu_get_page_table_entry        %a0,%d0
2198
2199         /* The page table entry must not no be busy
2200          */
2201         tstl    %a0@
2202         jne     L(mmu_map_error)
2203
2204         /* Do the mapping and advance the pointers
2205          */
2206         movel   %a2,%a0@
2207 2:
2208         addw    #PAGESIZE,%a2
2209         addw    #PAGESIZE,%a3
2210
2211         /* Ready with mapping?
2212          */
2213         lea     %a3@(-1),%a0
2214         cmpl    %a0,%a4
2215         jhi     L(mmu_map_040)
2216         jra     L(mmu_map_done)
2217
2218 L(mmu_map_030):
2219         /* Calculate the offset into the root table
2220          */
2221         movel   %a3,%d0
2222         moveq   #ROOT_INDEX_SHIFT,%d1
2223         lsrl    %d1,%d0
2224         mmu_get_root_table_entry        %d0
2225
2226         /* Check if logical address 32MB aligned,
2227          * so we can try to map it once
2228          */
2229         movel   %a3,%d0
2230         andl    #(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1)&(-ROOT_TABLE_SIZE),%d0
2231         jne     1f
2232
2233         /* Is there enough to map for 32MB at once
2234          */
2235         lea     %a3@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1),%a1
2236         cmpl    %a1,%a4
2237         jcs     1f
2238
2239         addql   #1,%a1
2240
2241         /* The root table entry must not no be busy
2242          */
2243         tstl    %a0@
2244         jne     L(mmu_map_error)
2245
2246         /* Do the mapping and advance the pointers
2247          */
2248         dputs   "early term1"
2249         dputn   %a2
2250         dputn   %a3
2251         dputn   %a1
2252         dputc   '\n'
2253         movel   %a2,%a0@
2254
2255         movel   %a1,%a3
2256         lea     %a2@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE),%a2
2257         jra     L(mmu_mapnext_030)
2258 1:
2259         /* Calculate the offset into the pointer table
2260          */
2261         movel   %a3,%d0
2262         moveq   #PTR_INDEX_SHIFT,%d1
2263         lsrl    %d1,%d0
2264         andl    #PTR_TABLE_SIZE-1,%d0
2265         mmu_get_ptr_table_entry         %a0,%d0
2266
2267         /* The pointer table entry must not no be busy
2268          */
2269         tstl    %a0@
2270         jne     L(mmu_map_error)
2271
2272         /* Do the mapping and advance the pointers
2273          */
2274         dputs   "early term2"
2275         dputn   %a2
2276         dputn   %a3
2277         dputc   '\n'
2278         movel   %a2,%a0@
2279
2280         addl    #PAGE_TABLE_SIZE*PAGESIZE,%a2
2281         addl    #PAGE_TABLE_SIZE*PAGESIZE,%a3
2282
2283 L(mmu_mapnext_030):
2284         /* Ready with mapping?
2285          */
2286         lea     %a3@(-1),%a0
2287         cmpl    %a0,%a4
2288         jhi     L(mmu_map_030)
2289         jra     L(mmu_map_done)
2290
2291 L(mmu_map_error):
2292
2293         dputs   "mmu_map error:"
2294         dputn   %a2
2295         dputn   %a3
2296         dputc   '\n'
2297
2298 L(mmu_map_done):
2299
2300 func_return     mmu_map
2301
2302 /*
2303  *      mmu_fixup
2304  *
2305  *      On the 040 class machines, all pages that are used for the
2306  *      mmu have to be fixed up.
2307  */
2308
2309 func_start      mmu_fixup_page_mmu_cache,%d0/%a0
2310
2311         dputs   "mmu_fixup_page_mmu_cache"
2312         dputn   ARG1
2313
2314         /* Calculate the offset into the root table
2315          */
2316         movel   ARG1,%d0
2317         moveq   #ROOT_INDEX_SHIFT,%d1
2318         lsrl    %d1,%d0
2319         mmu_get_root_table_entry        %d0
2320
2321         /* Calculate the offset into the pointer table
2322          */
2323         movel   ARG1,%d0
2324         moveq   #PTR_INDEX_SHIFT,%d1
2325         lsrl    %d1,%d0
2326         andl    #PTR_TABLE_SIZE-1,%d0
2327         mmu_get_ptr_table_entry         %a0,%d0
2328
2329         /* Calculate the offset into the page table
2330          */
2331         movel   ARG1,%d0
2332         moveq   #PAGE_INDEX_SHIFT,%d1
2333         lsrl    %d1,%d0
2334         andl    #PAGE_TABLE_SIZE-1,%d0
2335         mmu_get_page_table_entry        %a0,%d0
2336
2337         movel   %a0@,%d0
2338         andil   #_CACHEMASK040,%d0
2339         orl     %pc@(m68k_pgtable_cachemode),%d0
2340         movel   %d0,%a0@
2341
2342         dputc   '\n'
2343
2344 func_return     mmu_fixup_page_mmu_cache
2345
2346 /*
2347  *      mmu_temp_map
2348  *
2349  *      create a temporary mapping to enable the mmu,
2350  *      this we don't need any transparation translation tricks.
2351  */
2352
2353 func_start      mmu_temp_map,%d0/%d1/%a0/%a1
2354
2355         dputs   "mmu_temp_map"
2356         dputn   ARG1
2357         dputn   ARG2
2358         dputc   '\n'
2359
2360         lea     %pc@(L(temp_mmap_mem)),%a1
2361
2362         /* Calculate the offset in the root table
2363          */
2364         movel   ARG2,%d0
2365         moveq   #ROOT_INDEX_SHIFT,%d1
2366         lsrl    %d1,%d0
2367         mmu_get_root_table_entry        %d0
2368
2369         /* Check if the table is temporary allocated, so we have to reuse it
2370          */
2371         movel   %a0@,%d0
2372         cmpl    %pc@(L(memory_start)),%d0
2373         jcc     1f
2374
2375         /* Temporary allocate a ptr table and insert it into the root table
2376          */
2377         movel   %a1@,%d0
2378         addl    #PTR_TABLE_SIZE*4,%a1@
2379         orw     #_PAGE_TABLE+_PAGE_ACCESSED,%d0
2380         movel   %d0,%a0@
2381         dputs   " (new)"
2382 1:
2383         dputn   %d0
2384         /* Mask the root table entry for the ptr table
2385          */
2386         andw    #-ROOT_TABLE_SIZE,%d0
2387         movel   %d0,%a0
2388
2389         /* Calculate the offset into the pointer table
2390          */
2391         movel   ARG2,%d0
2392         moveq   #PTR_INDEX_SHIFT,%d1
2393         lsrl    %d1,%d0
2394         andl    #PTR_TABLE_SIZE-1,%d0
2395         lea     %a0@(%d0*4),%a0
2396         dputn   %a0
2397
2398         /* Check if a temporary page table is already allocated
2399          */
2400         movel   %a0@,%d0
2401         jne     1f
2402
2403         /* Temporary allocate a page table and insert it into the ptr table
2404          */
2405         movel   %a1@,%d0
2406         /* The 512 should be PAGE_TABLE_SIZE*4, but that violates the
2407            alignment restriction for pointer tables on the '0[46]0.  */
2408         addl    #512,%a1@
2409         orw     #_PAGE_TABLE+_PAGE_ACCESSED,%d0
2410         movel   %d0,%a0@
2411         dputs   " (new)"
2412 1:
2413         dputn   %d0
2414         /* Mask the ptr table entry for the page table
2415          */
2416         andw    #-PTR_TABLE_SIZE,%d0
2417         movel   %d0,%a0
2418
2419         /* Calculate the offset into the page table
2420          */
2421         movel   ARG2,%d0
2422         moveq   #PAGE_INDEX_SHIFT,%d1
2423         lsrl    %d1,%d0
2424         andl    #PAGE_TABLE_SIZE-1,%d0
2425         lea     %a0@(%d0*4),%a0
2426         dputn   %a0
2427
2428         /* Insert the address into the page table
2429          */
2430         movel   ARG1,%d0
2431         andw    #-PAGESIZE,%d0
2432         orw     #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
2433         movel   %d0,%a0@
2434         dputn   %d0
2435
2436         dputc   '\n'
2437
2438 func_return     mmu_temp_map
2439
2440 func_start      mmu_engage,%d0-%d2/%a0-%a3
2441
2442         moveq   #ROOT_TABLE_SIZE-1,%d0
2443         /* Temporarily use a different root table.  */
2444         lea     %pc@(L(kernel_pgdir_ptr)),%a0
2445         movel   %a0@,%a2
2446         movel   %pc@(L(memory_start)),%a1
2447         movel   %a1,%a0@
2448         movel   %a2,%a0
2449 1:
2450         movel   %a0@+,%a1@+
2451         dbra    %d0,1b
2452
2453         lea     %pc@(L(temp_mmap_mem)),%a0
2454         movel   %a1,%a0@
2455
2456         movew   #PAGESIZE-1,%d0
2457 1:
2458         clrl    %a1@+
2459         dbra    %d0,1b
2460
2461         lea     %pc@(1b),%a0
2462         movel   #1b,%a1
2463         /* Skip temp mappings if phys == virt */
2464         cmpl    %a0,%a1
2465         jeq     1f
2466
2467         mmu_temp_map    %a0,%a0
2468         mmu_temp_map    %a0,%a1
2469
2470         addw    #PAGESIZE,%a0
2471         addw    #PAGESIZE,%a1
2472         mmu_temp_map    %a0,%a0
2473         mmu_temp_map    %a0,%a1
2474 1:
2475         movel   %pc@(L(memory_start)),%a3
2476         movel   %pc@(L(phys_kernel_start)),%d2
2477
2478         is_not_040_or_060(L(mmu_engage_030))
2479
2480 L(mmu_engage_040):
2481         .chip   68040
2482         nop
2483         cinva   %bc
2484         nop
2485         pflusha
2486         nop
2487         movec   %a3,%srp
2488         movel   #TC_ENABLE+TC_PAGE4K,%d0
2489         movec   %d0,%tc         /* enable the MMU */
2490         jmp     1f:l
2491 1:      nop
2492         movec   %a2,%srp
2493         nop
2494         cinva   %bc
2495         nop
2496         pflusha
2497         .chip   68k
2498         jra     L(mmu_engage_cleanup)
2499
2500 L(mmu_engage_030_temp):
2501         .space  12
2502 L(mmu_engage_030):
2503         .chip   68030
2504         lea     %pc@(L(mmu_engage_030_temp)),%a0
2505         movel   #0x80000002,%a0@
2506         movel   %a3,%a0@(4)
2507         movel   #0x0808,%d0
2508         movec   %d0,%cacr
2509         pmove   %a0@,%srp
2510         pflusha
2511         /*
2512          * enable,super root enable,4096 byte pages,7 bit root index,
2513          * 7 bit pointer index, 6 bit page table index.
2514          */
2515         movel   #0x82c07760,%a0@(8)
2516         pmove   %a0@(8),%tc     /* enable the MMU */
2517         jmp     1f:l
2518 1:      movel   %a2,%a0@(4)
2519         movel   #0x0808,%d0
2520         movec   %d0,%cacr
2521         pmove   %a0@,%srp
2522         pflusha
2523         .chip   68k
2524
2525 L(mmu_engage_cleanup):
2526         subl    #PAGE_OFFSET,%d2
2527         subl    %d2,%a2
2528         movel   %a2,L(kernel_pgdir_ptr)
2529         subl    %d2,%fp
2530         subl    %d2,%sp
2531         subl    %d2,ARG0
2532
2533 func_return     mmu_engage
2534
2535 func_start      mmu_get_root_table_entry,%d0/%a1
2536
2537 #if 0
2538         dputs   "mmu_get_root_table_entry:"
2539         dputn   ARG1
2540         dputs   " ="
2541 #endif
2542
2543         movel   %pc@(L(kernel_pgdir_ptr)),%a0
2544         tstl    %a0
2545         jne     2f
2546
2547         dputs   "\nmmu_init:"
2548
2549         /* Find the start of free memory, get_bi_record does this for us,
2550          * as the bootinfo structure is located directly behind the kernel
2551          * and and we simply search for the last entry.
2552          */
2553         get_bi_record   BI_LAST
2554         addw    #PAGESIZE-1,%a0
2555         movel   %a0,%d0
2556         andw    #-PAGESIZE,%d0
2557
2558         dputn   %d0
2559
2560         lea     %pc@(L(memory_start)),%a0
2561         movel   %d0,%a0@
2562         lea     %pc@(L(kernel_end)),%a0
2563         movel   %d0,%a0@
2564
2565         /* we have to return the first page at _stext since the init code
2566          * in mm/init.c simply expects kernel_pg_dir there, the rest of
2567          * page is used for further ptr tables in get_ptr_table.
2568          */
2569         lea     %pc@(_stext),%a0
2570         lea     %pc@(L(mmu_cached_pointer_tables)),%a1
2571         movel   %a0,%a1@
2572         addl    #ROOT_TABLE_SIZE*4,%a1@
2573
2574         lea     %pc@(L(mmu_num_pointer_tables)),%a1
2575         addql   #1,%a1@
2576
2577         /* clear the page
2578          */
2579         movel   %a0,%a1
2580         movew   #PAGESIZE/4-1,%d0
2581 1:
2582         clrl    %a1@+
2583         dbra    %d0,1b
2584
2585         lea     %pc@(L(kernel_pgdir_ptr)),%a1
2586         movel   %a0,%a1@
2587
2588         dputn   %a0
2589         dputc   '\n'
2590 2:
2591         movel   ARG1,%d0
2592         lea     %a0@(%d0*4),%a0
2593
2594 #if 0
2595         dputn   %a0
2596         dputc   '\n'
2597 #endif
2598
2599 func_return     mmu_get_root_table_entry
2600
2601
2602
2603 func_start      mmu_get_ptr_table_entry,%d0/%a1
2604
2605 #if 0
2606         dputs   "mmu_get_ptr_table_entry:"
2607         dputn   ARG1
2608         dputn   ARG2
2609         dputs   " ="
2610 #endif
2611
2612         movel   ARG1,%a0
2613         movel   %a0@,%d0
2614         jne     2f
2615
2616         /* Keep track of the number of pointer tables we use
2617          */
2618         dputs   "\nmmu_get_new_ptr_table:"
2619         lea     %pc@(L(mmu_num_pointer_tables)),%a0
2620         movel   %a0@,%d0
2621         addql   #1,%a0@
2622
2623         /* See if there is a free pointer table in our cache of pointer tables
2624          */
2625         lea     %pc@(L(mmu_cached_pointer_tables)),%a1
2626         andw    #7,%d0
2627         jne     1f
2628
2629         /* Get a new pointer table page from above the kernel memory
2630          */
2631         get_new_page
2632         movel   %a0,%a1@
2633 1:
2634         /* There is an unused pointer table in our cache... use it
2635          */
2636         movel   %a1@,%d0
2637         addl    #PTR_TABLE_SIZE*4,%a1@
2638
2639         dputn   %d0
2640         dputc   '\n'
2641
2642         /* Insert the new pointer table into the root table
2643          */
2644         movel   ARG1,%a0
2645         orw     #_PAGE_TABLE+_PAGE_ACCESSED,%d0
2646         movel   %d0,%a0@
2647 2:
2648         /* Extract the pointer table entry
2649          */
2650         andw    #-PTR_TABLE_SIZE,%d0
2651         movel   %d0,%a0
2652         movel   ARG2,%d0
2653         lea     %a0@(%d0*4),%a0
2654
2655 #if 0
2656         dputn   %a0
2657         dputc   '\n'
2658 #endif
2659
2660 func_return     mmu_get_ptr_table_entry
2661
2662
2663 func_start      mmu_get_page_table_entry,%d0/%a1
2664
2665 #if 0
2666         dputs   "mmu_get_page_table_entry:"
2667         dputn   ARG1
2668         dputn   ARG2
2669         dputs   " ="
2670 #endif
2671
2672         movel   ARG1,%a0
2673         movel   %a0@,%d0
2674         jne     2f
2675
2676         /* If the page table entry doesn't exist, we allocate a complete new
2677          * page and use it as one continues big page table which can cover
2678          * 4MB of memory, nearly almost all mappings have that alignment.
2679          */
2680         get_new_page
2681         addw    #_PAGE_TABLE+_PAGE_ACCESSED,%a0
2682
2683         /* align pointer table entry for a page of page tables
2684          */
2685         movel   ARG1,%d0
2686         andw    #-(PAGESIZE/PAGE_TABLE_SIZE),%d0
2687         movel   %d0,%a1
2688
2689         /* Insert the page tables into the pointer entries
2690          */
2691         moveq   #PAGESIZE/PAGE_TABLE_SIZE/4-1,%d0
2692 1:
2693         movel   %a0,%a1@+
2694         lea     %a0@(PAGE_TABLE_SIZE*4),%a0
2695         dbra    %d0,1b
2696
2697         /* Now we can get the initialized pointer table entry
2698          */
2699         movel   ARG1,%a0
2700         movel   %a0@,%d0
2701 2:
2702         /* Extract the page table entry
2703          */
2704         andw    #-PAGE_TABLE_SIZE,%d0
2705         movel   %d0,%a0
2706         movel   ARG2,%d0
2707         lea     %a0@(%d0*4),%a0
2708
2709 #if 0
2710         dputn   %a0
2711         dputc   '\n'
2712 #endif
2713
2714 func_return     mmu_get_page_table_entry
2715
2716 /*
2717  *      get_new_page
2718  *
2719  *      Return a new page from the memory start and clear it.
2720  */
2721 func_start      get_new_page,%d0/%a1
2722
2723         dputs   "\nget_new_page:"
2724
2725         /* allocate the page and adjust memory_start
2726          */
2727         lea     %pc@(L(memory_start)),%a0
2728         movel   %a0@,%a1
2729         addl    #PAGESIZE,%a0@
2730
2731         /* clear the new page
2732          */
2733         movel   %a1,%a0
2734         movew   #PAGESIZE/4-1,%d0
2735 1:
2736         clrl    %a1@+
2737         dbra    %d0,1b
2738
2739         dputn   %a0
2740         dputc   '\n'
2741
2742 func_return     get_new_page
2743
2744
2745
2746 /*
2747  * Debug output support
2748  * Atarians have a choice between the parallel port, the serial port
2749  * from the MFP or a serial port of the SCC
2750  */
2751
2752 #ifdef CONFIG_MAC
2753
2754 L(scc_initable_mac):
2755         .byte   9,12            /* Reset */
2756         .byte   4,0x44          /* x16, 1 stopbit, no parity */
2757         .byte   3,0xc0          /* receiver: 8 bpc */
2758         .byte   5,0xe2          /* transmitter: 8 bpc, assert dtr/rts */
2759         .byte   9,0             /* no interrupts */
2760         .byte   10,0            /* NRZ */
2761         .byte   11,0x50         /* use baud rate generator */
2762         .byte   12,1,13,0       /* 38400 baud */
2763         .byte   14,1            /* Baud rate generator enable */
2764         .byte   3,0xc1          /* enable receiver */
2765         .byte   5,0xea          /* enable transmitter */
2766         .byte   -1
2767         .even
2768 #endif
2769
2770 #ifdef CONFIG_ATARI
2771 /* #define USE_PRINTER */
2772 /* #define USE_SCC_B */
2773 /* #define USE_SCC_A */
2774 #define USE_MFP
2775
2776 #if defined(USE_SCC_A) || defined(USE_SCC_B)
2777 #define USE_SCC
2778 /* Initialisation table for SCC */
2779 L(scc_initable):
2780         .byte   9,12            /* Reset */
2781         .byte   4,0x44          /* x16, 1 stopbit, no parity */
2782         .byte   3,0xc0          /* receiver: 8 bpc */
2783         .byte   5,0xe2          /* transmitter: 8 bpc, assert dtr/rts */
2784         .byte   9,0             /* no interrupts */
2785         .byte   10,0            /* NRZ */
2786         .byte   11,0x50         /* use baud rate generator */
2787         .byte   12,24,13,0      /* 9600 baud */
2788         .byte   14,2,14,3       /* use master clock for BRG, enable */
2789         .byte   3,0xc1          /* enable receiver */
2790         .byte   5,0xea          /* enable transmitter */
2791         .byte   -1
2792         .even
2793 #endif
2794
2795 #ifdef USE_PRINTER
2796
2797 LPSG_SELECT     = 0xff8800
2798 LPSG_READ       = 0xff8800
2799 LPSG_WRITE      = 0xff8802
2800 LPSG_IO_A       = 14
2801 LPSG_IO_B       = 15
2802 LPSG_CONTROL    = 7
2803 LSTMFP_GPIP     = 0xfffa01
2804 LSTMFP_DDR      = 0xfffa05
2805 LSTMFP_IERB     = 0xfffa09
2806
2807 #elif defined(USE_SCC_B)
2808
2809 LSCC_CTRL       = 0xff8c85
2810 LSCC_DATA       = 0xff8c87
2811
2812 #elif defined(USE_SCC_A)
2813
2814 LSCC_CTRL       = 0xff8c81
2815 LSCC_DATA       = 0xff8c83
2816
2817 #elif defined(USE_MFP)
2818
2819 LMFP_UCR     = 0xfffa29
2820 LMFP_TDCDR   = 0xfffa1d
2821 LMFP_TDDR    = 0xfffa25
2822 LMFP_TSR     = 0xfffa2d
2823 LMFP_UDR     = 0xfffa2f
2824
2825 #endif
2826 #endif  /* CONFIG_ATARI */
2827
2828 /*
2829  * Serial port output support.
2830  */
2831
2832 /*
2833  * Initialize serial port hardware for 9600/8/1
2834  */
2835 func_start      serial_init,%d0/%d1/%a0/%a1
2836         /*
2837          *      Some of the register usage that follows
2838          *      CONFIG_AMIGA
2839          *              a0 = pointer to boot info record
2840          *              d0 = boot info offset
2841          *      CONFIG_ATARI
2842          *              a0 = address of SCC
2843          *              a1 = Liobase address/address of scc_initable
2844          *              d0 = init data for serial port
2845          *      CONFIG_MAC
2846          *              a0 = address of SCC
2847          *              a1 = address of scc_initable_mac
2848          *              d0 = init data for serial port
2849          */
2850
2851 #ifdef CONFIG_AMIGA
2852 #define SERIAL_DTR      7
2853 #define SERIAL_CNTRL    CIABBASE+C_PRA
2854
2855         is_not_amiga(1f)
2856         lea     %pc@(L(custom)),%a0
2857         movel   #-ZTWOBASE,%a0@
2858         bclr    #SERIAL_DTR,SERIAL_CNTRL-ZTWOBASE
2859         get_bi_record   BI_AMIGA_SERPER
2860         movew   %a0@,CUSTOMBASE+C_SERPER-ZTWOBASE
2861 |       movew   #61,CUSTOMBASE+C_SERPER-ZTWOBASE
2862 1:
2863 #endif
2864 #ifdef CONFIG_ATARI
2865         is_not_atari(4f)
2866         movel   %pc@(L(iobase)),%a1
2867 #if defined(USE_PRINTER)
2868         bclr    #0,%a1@(LSTMFP_IERB)
2869         bclr    #0,%a1@(LSTMFP_DDR)
2870         moveb   #LPSG_CONTROL,%a1@(LPSG_SELECT)
2871         moveb   #0xff,%a1@(LPSG_WRITE)
2872         moveb   #LPSG_IO_B,%a1@(LPSG_SELECT)
2873         clrb    %a1@(LPSG_WRITE)
2874         moveb   #LPSG_IO_A,%a1@(LPSG_SELECT)
2875         moveb   %a1@(LPSG_READ),%d0
2876         bset    #5,%d0
2877         moveb   %d0,%a1@(LPSG_WRITE)
2878 #elif defined(USE_SCC)
2879         lea     %a1@(LSCC_CTRL),%a0
2880         lea     %pc@(L(scc_initable)),%a1
2881 2:      moveb   %a1@+,%d0
2882         jmi     3f
2883         moveb   %d0,%a0@
2884         moveb   %a1@+,%a0@
2885         jra     2b
2886 3:      clrb    %a0@
2887 #elif defined(USE_MFP)
2888         bclr    #1,%a1@(LMFP_TSR)
2889         moveb   #0x88,%a1@(LMFP_UCR)
2890         andb    #0x70,%a1@(LMFP_TDCDR)
2891         moveb   #2,%a1@(LMFP_TDDR)
2892         orb     #1,%a1@(LMFP_TDCDR)
2893         bset    #1,%a1@(LMFP_TSR)
2894 #endif
2895         jra     L(serial_init_done)
2896 4:
2897 #endif
2898 #ifdef CONFIG_MAC
2899         is_not_mac(L(serial_init_not_mac))
2900
2901 #ifdef SERIAL_DEBUG
2902 /* You may define either or both of these. */
2903 #define MAC_USE_SCC_A /* Modem port */
2904 #define MAC_USE_SCC_B /* Printer port */
2905
2906 #define mac_scc_cha_b_ctrl_offset       0x0
2907 #define mac_scc_cha_a_ctrl_offset       0x2
2908 #define mac_scc_cha_b_data_offset       0x4
2909 #define mac_scc_cha_a_data_offset       0x6
2910
2911 #ifdef MAC_USE_SCC_A
2912         /* Initialize channel A */
2913         movel   %pc@(L(mac_sccbase)),%a0
2914         lea     %pc@(L(scc_initable_mac)),%a1
2915 5:      moveb   %a1@+,%d0
2916         jmi     6f
2917         moveb   %d0,%a0@(mac_scc_cha_a_ctrl_offset)
2918         moveb   %a1@+,%a0@(mac_scc_cha_a_ctrl_offset)
2919         jra     5b
2920 6:
2921 #endif  /* MAC_USE_SCC_A */
2922
2923 #ifdef MAC_USE_SCC_B
2924         /* Initialize channel B */
2925 #ifndef MAC_USE_SCC_A   /* Load mac_sccbase only if needed */
2926         movel   %pc@(L(mac_sccbase)),%a0
2927 #endif  /* MAC_USE_SCC_A */
2928         lea     %pc@(L(scc_initable_mac)),%a1
2929 7:      moveb   %a1@+,%d0
2930         jmi     8f
2931         moveb   %d0,%a0@(mac_scc_cha_b_ctrl_offset)
2932         moveb   %a1@+,%a0@(mac_scc_cha_b_ctrl_offset)
2933         jra     7b
2934 8:
2935 #endif  /* MAC_USE_SCC_B */
2936 #endif  /* SERIAL_DEBUG */
2937
2938         jra     L(serial_init_done)
2939 L(serial_init_not_mac):
2940 #endif  /* CONFIG_MAC */
2941
2942 #ifdef CONFIG_Q40
2943         is_not_q40(2f)
2944 /* debug output goes into SRAM, so we don't do it unless requested
2945    - check for '%LX$' signature in SRAM   */
2946         lea     %pc@(q40_mem_cptr),%a1
2947         move.l  #0xff020010,%a1@  /* must be inited - also used by debug=mem */
2948         move.l  #0xff020000,%a1
2949         cmp.b   #'%',%a1@
2950         bne     2f      /*nodbg*/
2951         addq.w  #4,%a1
2952         cmp.b   #'L',%a1@
2953         bne     2f      /*nodbg*/
2954         addq.w  #4,%a1
2955         cmp.b   #'X',%a1@
2956         bne     2f      /*nodbg*/
2957         addq.w  #4,%a1
2958         cmp.b   #'$',%a1@
2959         bne     2f      /*nodbg*/
2960         /* signature OK */
2961         lea     %pc@(L(q40_do_debug)),%a1
2962         tas     %a1@
2963 /*nodbg: q40_do_debug is 0 by default*/
2964 2:
2965 #endif
2966
2967 #ifdef CONFIG_APOLLO
2968 /* We count on the PROM initializing SIO1 */
2969 #endif
2970
2971 #ifdef CONFIG_HP300
2972 /* We count on the boot loader initialising the UART */
2973 #endif
2974
2975 L(serial_init_done):
2976 func_return     serial_init
2977
2978 /*
2979  * Output character on serial port.
2980  */
2981 func_start      serial_putc,%d0/%d1/%a0/%a1
2982
2983         movel   ARG1,%d0
2984         cmpib   #'\n',%d0
2985         jbne    1f
2986
2987         /* A little safe recursion is good for the soul */
2988         serial_putc     #'\r'
2989 1:
2990
2991 #ifdef CONFIG_AMIGA
2992         is_not_amiga(2f)
2993         andw    #0x00ff,%d0
2994         oriw    #0x0100,%d0
2995         movel   %pc@(L(custom)),%a0
2996         movew   %d0,%a0@(CUSTOMBASE+C_SERDAT)
2997 1:      movew   %a0@(CUSTOMBASE+C_SERDATR),%d0
2998         andw    #0x2000,%d0
2999         jeq     1b
3000         jra     L(serial_putc_done)
3001 2:
3002 #endif
3003
3004 #ifdef CONFIG_MAC
3005         is_not_mac(5f)
3006
3007 #ifdef SERIAL_DEBUG
3008
3009 #ifdef MAC_USE_SCC_A
3010         movel   %pc@(L(mac_sccbase)),%a1
3011 3:      btst    #2,%a1@(mac_scc_cha_a_ctrl_offset)
3012         jeq     3b
3013         moveb   %d0,%a1@(mac_scc_cha_a_data_offset)
3014 #endif  /* MAC_USE_SCC_A */
3015
3016 #ifdef MAC_USE_SCC_B
3017 #ifndef MAC_USE_SCC_A   /* Load mac_sccbase only if needed */
3018         movel   %pc@(L(mac_sccbase)),%a1
3019 #endif  /* MAC_USE_SCC_A */
3020 4:      btst    #2,%a1@(mac_scc_cha_b_ctrl_offset)
3021         jeq     4b
3022         moveb   %d0,%a1@(mac_scc_cha_b_data_offset)
3023 #endif  /* MAC_USE_SCC_B */
3024
3025 #endif  /* SERIAL_DEBUG */
3026
3027         jra     L(serial_putc_done)
3028 5:
3029 #endif  /* CONFIG_MAC */
3030
3031 #ifdef CONFIG_ATARI
3032         is_not_atari(4f)
3033         movel   %pc@(L(iobase)),%a1
3034 #if defined(USE_PRINTER)
3035 3:      btst    #0,%a1@(LSTMFP_GPIP)
3036         jne     3b
3037         moveb   #LPSG_IO_B,%a1@(LPSG_SELECT)
3038         moveb   %d0,%a1@(LPSG_WRITE)
3039         moveb   #LPSG_IO_A,%a1@(LPSG_SELECT)
3040         moveb   %a1@(LPSG_READ),%d0
3041         bclr    #5,%d0
3042         moveb   %d0,%a1@(LPSG_WRITE)
3043         nop
3044         nop
3045         bset    #5,%d0
3046         moveb   %d0,%a1@(LPSG_WRITE)
3047 #elif defined(USE_SCC)
3048 3:      btst    #2,%a1@(LSCC_CTRL)
3049         jeq     3b
3050         moveb   %d0,%a1@(LSCC_DATA)
3051 #elif defined(USE_MFP)
3052 3:      btst    #7,%a1@(LMFP_TSR)
3053         jeq     3b
3054         moveb   %d0,%a1@(LMFP_UDR)
3055 #endif
3056         jra     L(serial_putc_done)
3057 4:
3058 #endif  /* CONFIG_ATARI */
3059
3060 #ifdef CONFIG_MVME147
3061         is_not_mvme147(2f)
3062 1:      btst    #2,M147_SCC_CTRL_A
3063         jeq     1b
3064         moveb   %d0,M147_SCC_DATA_A
3065         jbra    L(serial_putc_done)
3066 2:
3067 #endif
3068
3069 #ifdef CONFIG_MVME16x
3070         is_not_mvme16x(2f)
3071         /*
3072          * If the loader gave us a board type then we can use that to
3073          * select an appropriate output routine; otherwise we just use
3074          * the Bug code.  If we have to use the Bug that means the Bug
3075          * workspace has to be valid, which means the Bug has to use
3076          * the SRAM, which is non-standard.
3077          */
3078         moveml  %d0-%d7/%a2-%a6,%sp@-
3079         movel   vme_brdtype,%d1
3080         jeq     1f                      | No tag - use the Bug
3081         cmpi    #VME_TYPE_MVME162,%d1
3082         jeq     6f
3083         cmpi    #VME_TYPE_MVME172,%d1
3084         jne     5f
3085         /* 162/172; it's an SCC */
3086 6:      btst    #2,M162_SCC_CTRL_A
3087         nop
3088         nop
3089         nop
3090         jeq     6b
3091         moveb   #8,M162_SCC_CTRL_A
3092         nop
3093         nop
3094         nop
3095         moveb   %d0,M162_SCC_CTRL_A
3096         jra     3f
3097 5:
3098         /* 166/167/177; it's a CD2401 */
3099         moveb   #0,M167_CYCAR
3100         moveb   M167_CYIER,%d2
3101         moveb   #0x02,M167_CYIER
3102 7:
3103         btst    #5,M167_PCSCCTICR
3104         jeq     7b
3105         moveb   M167_PCTPIACKR,%d1
3106         moveb   M167_CYLICR,%d1
3107         jeq     8f
3108         moveb   #0x08,M167_CYTEOIR
3109         jra     7b
3110 8:
3111         moveb   %d0,M167_CYTDR
3112         moveb   #0,M167_CYTEOIR
3113         moveb   %d2,M167_CYIER
3114         jra     3f
3115 1:
3116         moveb   %d0,%sp@-
3117         trap    #15
3118         .word   0x0020  /* TRAP 0x020 */
3119 3:
3120         moveml  %sp@+,%d0-%d7/%a2-%a6
3121         jbra    L(serial_putc_done)
3122 2:
3123 #endif /* CONFIG_MVME16x */
3124
3125 #ifdef CONFIG_BVME6000
3126         is_not_bvme6000(2f)
3127         /*
3128          * The BVME6000 machine has a serial port ...
3129          */
3130 1:      btst    #2,BVME_SCC_CTRL_A
3131         jeq     1b
3132         moveb   %d0,BVME_SCC_DATA_A
3133         jbra    L(serial_putc_done)
3134 2:
3135 #endif
3136
3137 #ifdef CONFIG_SUN3X
3138         is_not_sun3x(2f)
3139         movel   %d0,-(%sp)
3140         movel   0xFEFE0018,%a1
3141         jbsr    (%a1)
3142         addq    #4,%sp
3143         jbra    L(serial_putc_done)
3144 2:
3145 #endif
3146
3147 #ifdef CONFIG_Q40
3148         is_not_q40(2f)
3149         tst.l   %pc@(L(q40_do_debug))   /* only debug if requested */
3150         beq     2f
3151         lea     %pc@(q40_mem_cptr),%a1
3152         move.l  %a1@,%a0
3153         move.b  %d0,%a0@
3154         addq.l  #4,%a0
3155         move.l  %a0,%a1@
3156         jbra    L(serial_putc_done)
3157 2:
3158 #endif
3159
3160 #ifdef CONFIG_APOLLO
3161         is_not_apollo(2f)
3162         movl    %pc@(L(iobase)),%a1
3163         moveb   %d0,%a1@(LTHRB0)
3164 1:      moveb   %a1@(LSRB0),%d0
3165         andb    #0x4,%d0
3166         beq     1b
3167         jbra    L(serial_putc_done)
3168 2:
3169 #endif
3170
3171 #ifdef CONFIG_HP300
3172         is_not_hp300(3f)
3173         movl    %pc@(L(iobase)),%a1
3174         addl    %pc@(L(uartbase)),%a1
3175         movel   %pc@(L(uart_scode)),%d1 /* Check the scode */
3176         jmi     3f                      /* Unset? Exit */
3177         cmpi    #256,%d1                /* APCI scode? */
3178         jeq     2f
3179 1:      moveb   %a1@(DCALSR),%d1        /* Output to DCA */
3180         andb    #0x20,%d1
3181         beq     1b
3182         moveb   %d0,%a1@(DCADATA)
3183         jbra    L(serial_putc_done)
3184 2:      moveb   %a1@(APCILSR),%d1       /* Output to APCI */
3185         andb    #0x20,%d1
3186         beq     2b
3187         moveb   %d0,%a1@(APCIDATA)
3188         jbra    L(serial_putc_done)
3189 3:
3190 #endif
3191
3192 L(serial_putc_done):
3193 func_return     serial_putc
3194
3195 /*
3196  * Output a string.
3197  */
3198 func_start      puts,%d0/%a0
3199
3200         movel   ARG1,%a0
3201         jra     2f
3202 1:
3203 #ifdef CONSOLE
3204         console_putc    %d0
3205 #endif
3206 #ifdef SERIAL_DEBUG
3207         serial_putc     %d0
3208 #endif
3209 2:      moveb   %a0@+,%d0
3210         jne     1b
3211
3212 func_return     puts
3213
3214 /*
3215  * Output number in hex notation.
3216  */
3217
3218 func_start      putn,%d0-%d2
3219
3220         putc    ' '
3221
3222         movel   ARG1,%d0
3223         moveq   #7,%d1
3224 1:      roll    #4,%d0
3225         move    %d0,%d2
3226         andb    #0x0f,%d2
3227         addb    #'0',%d2
3228         cmpb    #'9',%d2
3229         jls     2f
3230         addb    #'A'-('9'+1),%d2
3231 2:
3232 #ifdef CONSOLE
3233         console_putc    %d2
3234 #endif
3235 #ifdef SERIAL_DEBUG
3236         serial_putc     %d2
3237 #endif
3238         dbra    %d1,1b
3239
3240 func_return     putn
3241
3242 #ifdef CONFIG_MAC
3243 /*
3244  *      mac_early_print
3245  *
3246  *      This routine takes its parameters on the stack.  It then
3247  *      turns around and calls the internal routines.  This routine
3248  *      is used by the boot console.
3249  *
3250  *      The calling parameters are:
3251  *              void mac_early_print(const char *str, unsigned length);
3252  *
3253  *      This routine does NOT understand variable arguments only
3254  *      simple strings!
3255  */
3256 ENTRY(mac_early_print)
3257         moveml  %d0/%d1/%a0,%sp@-
3258         movew   %sr,%sp@-
3259         ori     #0x0700,%sr
3260         movel   %sp@(18),%a0            /* fetch parameter */
3261         movel   %sp@(22),%d1            /* fetch parameter */
3262         jra     2f
3263 1:
3264 #ifdef CONSOLE
3265         console_putc    %d0
3266 #endif
3267 #ifdef SERIAL_DEBUG
3268         serial_putc     %d0
3269 #endif
3270         subq    #1,%d1
3271 2:      jeq     3f
3272         moveb   %a0@+,%d0
3273         jne     1b
3274 3:
3275         movew   %sp@+,%sr
3276         moveml  %sp@+,%d0/%d1/%a0
3277         rts
3278 #endif /* CONFIG_MAC */
3279
3280 #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
3281 func_start      set_leds,%d0/%a0
3282         movel   ARG1,%d0
3283 #ifdef CONFIG_HP300
3284         is_not_hp300(1f)
3285         movel   %pc@(L(iobase)),%a0
3286         moveb   %d0,%a0@(0x1ffff)
3287         jra     2f
3288 #endif
3289 1:
3290 #ifdef CONFIG_APOLLO
3291         movel   %pc@(L(iobase)),%a0
3292         lsll    #8,%d0
3293         eorw    #0xff00,%d0
3294         moveb   %d0,%a0@(LCPUCTRL)
3295 #endif
3296 2:
3297 func_return     set_leds
3298 #endif
3299
3300 #ifdef CONSOLE
3301 /*
3302  *      For continuity, see the data alignment
3303  *      to which this structure is tied.
3304  */
3305 #define Lconsole_struct_cur_column      0
3306 #define Lconsole_struct_cur_row         4
3307 #define Lconsole_struct_num_columns     8
3308 #define Lconsole_struct_num_rows        12
3309 #define Lconsole_struct_left_edge       16
3310 #define Lconsole_struct_penguin_putc    20
3311
3312 func_start      console_init,%a0-%a4/%d0-%d7
3313         /*
3314          *      Some of the register usage that follows
3315          *              a0 = pointer to boot_info
3316          *              a1 = pointer to screen
3317          *              a2 = pointer to Lconsole_globals
3318          *              d3 = pixel width of screen
3319          *              d4 = pixel height of screen
3320          *              (d3,d4) ~= (x,y) of a point just below
3321          *                      and to the right of the screen
3322          *                      NOT on the screen!
3323          *              d5 = number of bytes per scan line
3324          *              d6 = number of bytes on the entire screen
3325          */
3326
3327         lea     %pc@(L(console_globals)),%a2
3328         movel   %pc@(L(mac_videobase)),%a1
3329         movel   %pc@(L(mac_rowbytes)),%d5
3330         movel   %pc@(L(mac_dimensions)),%d3     /* -> low byte */
3331         movel   %d3,%d4
3332         swap    %d4             /* -> high byte */
3333         andl    #0xffff,%d3     /* d3 = screen width in pixels */
3334         andl    #0xffff,%d4     /* d4 = screen height in pixels */
3335
3336         movel   %d5,%d6
3337 |       subl    #20,%d6
3338         mulul   %d4,%d6         /* scan line bytes x num scan lines */
3339         divul   #8,%d6          /* we'll clear 8 bytes at a time */
3340         moveq   #-1,%d0         /* Mac_black */
3341         subq    #1,%d6
3342
3343 L(console_clear_loop):
3344         movel   %d0,%a1@+
3345         movel   %d0,%a1@+
3346         dbra    %d6,L(console_clear_loop)
3347
3348         /* Calculate font size */
3349
3350 #if   defined(FONT_8x8) && defined(CONFIG_FONT_8x8)
3351         lea     %pc@(font_vga_8x8),%a0
3352 #elif defined(FONT_8x16) && defined(CONFIG_FONT_8x16)
3353         lea     %pc@(font_vga_8x16),%a0
3354 #elif defined(FONT_6x11) && defined(CONFIG_FONT_6x11)
3355         lea     %pc@(font_vga_6x11),%a0
3356 #elif defined(CONFIG_FONT_8x8) /* default */
3357         lea     %pc@(font_vga_8x8),%a0
3358 #else /* no compiled-in font */
3359         lea     0,%a0
3360 #endif
3361
3362         /*
3363          *      At this point we make a shift in register usage
3364          *      a1 = address of console_font pointer
3365          */
3366         lea     %pc@(L(console_font)),%a1
3367         movel   %a0,%a1@        /* store pointer to struct fbcon_font_desc in console_font */
3368         tstl    %a0
3369         jeq     1f
3370         lea     %pc@(L(console_font_data)),%a4
3371         movel   %a0@(FONT_DESC_DATA),%d0
3372         subl    #L(console_font),%a1
3373         addl    %a1,%d0
3374         movel   %d0,%a4@
3375
3376         /*
3377          *      Calculate global maxs
3378          *      Note - we can use either an
3379          *      8 x 16 or 8 x 8 character font
3380          *      6 x 11 also supported
3381          */
3382                 /* ASSERT: a0 = contents of Lconsole_font */
3383         movel   %d3,%d0                         /* screen width in pixels */
3384         divul   %a0@(FONT_DESC_WIDTH),%d0       /* d0 = max num chars per row */
3385
3386         movel   %d4,%d1                         /* screen height in pixels */
3387         divul   %a0@(FONT_DESC_HEIGHT),%d1      /* d1 = max num rows */
3388
3389         movel   %d0,%a2@(Lconsole_struct_num_columns)
3390         movel   %d1,%a2@(Lconsole_struct_num_rows)
3391
3392         /*
3393          *      Clear the current row and column
3394          */
3395         clrl    %a2@(Lconsole_struct_cur_column)
3396         clrl    %a2@(Lconsole_struct_cur_row)
3397         clrl    %a2@(Lconsole_struct_left_edge)
3398
3399         /*
3400          * Initialization is complete
3401          */
3402 1:
3403 func_return     console_init
3404
3405 func_start      console_put_stats,%a0/%d7
3406         /*
3407          *      Some of the register usage that follows
3408          *              a0 = pointer to boot_info
3409          *              d7 = value of boot_info fields
3410          */
3411         puts    "\nMacLinux\n"
3412
3413 #ifdef SERIAL_DEBUG
3414         puts    "\n vidaddr:"
3415         putn    %pc@(L(mac_videobase))          /* video addr. */
3416
3417         puts    "\n  _stext:"
3418         lea     %pc@(_stext),%a0
3419         putn    %a0
3420
3421         puts    "\nbootinfo:"
3422         lea     %pc@(_end),%a0
3423         putn    %a0
3424
3425         puts    "\n   cpuid:"
3426         putn    %pc@(L(cputype))
3427
3428 #  ifdef CONFIG_MAC
3429         puts    "\n sccbase:"
3430         putn    %pc@(L(mac_sccbase))
3431 #  endif
3432 #  ifdef MMU_PRINT
3433         putc    '\n'
3434         jbsr    mmu_print_machine_cpu_types
3435 #  endif
3436 #endif /* SERIAL_DEBUG */
3437
3438         putc    '\n'
3439
3440 func_return     console_put_stats
3441
3442 #ifdef CONSOLE_PENGUIN
3443 func_start      console_put_penguin,%a0-%a1/%d0-%d7
3444         /*
3445          *      Get 'that_penguin' onto the screen in the upper right corner
3446          *      penguin is 64 x 74 pixels, align against right edge of screen
3447          */
3448         lea     %pc@(L(mac_dimensions)),%a0
3449         movel   %a0@,%d0
3450         andil   #0xffff,%d0
3451         subil   #64,%d0         /* snug up against the right edge */
3452         clrl    %d1             /* start at the top */
3453         movel   #73,%d7
3454         lea     %pc@(L(that_penguin)),%a1
3455 L(console_penguin_row):
3456         movel   #31,%d6
3457 L(console_penguin_pixel_pair):
3458         moveb   %a1@,%d2
3459         lsrb    #4,%d2
3460         console_plot_pixel %d0,%d1,%d2
3461         addq    #1,%d0
3462         moveb   %a1@+,%d2
3463         console_plot_pixel %d0,%d1,%d2
3464         addq    #1,%d0
3465         dbra    %d6,L(console_penguin_pixel_pair)
3466
3467         subil   #64,%d0
3468         addq    #1,%d1
3469         dbra    %d7,L(console_penguin_row)
3470
3471 func_return     console_put_penguin
3472
3473 /* include penguin bitmap */
3474 L(that_penguin):
3475 #include "../mac/mac_penguin.S"
3476 #endif
3477
3478         /*
3479          * Calculate source and destination addresses
3480          *      output  a1 = dest
3481          *              a2 = source
3482          */
3483
3484 func_start      console_scroll,%a0-%a4/%d0-%d7
3485         lea     %pc@(L(mac_videobase)),%a0
3486         movel   %a0@,%a1
3487         movel   %a1,%a2
3488         lea     %pc@(L(mac_rowbytes)),%a0
3489         movel   %a0@,%d5
3490         movel   %pc@(L(console_font)),%a0
3491         tstl    %a0
3492         jeq     1f
3493         mulul   %a0@(FONT_DESC_HEIGHT),%d5      /* account for # scan lines per character */
3494         addal   %d5,%a2
3495
3496         /*
3497          * Get dimensions
3498          */
3499         lea     %pc@(L(mac_dimensions)),%a0
3500         movel   %a0@,%d3
3501         movel   %d3,%d4
3502         swap    %d4
3503         andl    #0xffff,%d3     /* d3 = screen width in pixels */
3504         andl    #0xffff,%d4     /* d4 = screen height in pixels */
3505
3506         /*
3507          * Calculate number of bytes to move
3508          */
3509         lea     %pc@(L(mac_rowbytes)),%a0
3510         movel   %a0@,%d6
3511         movel   %pc@(L(console_font)),%a0
3512         subl    %a0@(FONT_DESC_HEIGHT),%d4      /* we're not scrolling the top row! */
3513         mulul   %d4,%d6         /* scan line bytes x num scan lines */
3514         divul   #32,%d6         /* we'll move 8 longs at a time */
3515         subq    #1,%d6
3516
3517 L(console_scroll_loop):
3518         movel   %a2@+,%a1@+
3519         movel   %a2@+,%a1@+
3520         movel   %a2@+,%a1@+
3521         movel   %a2@+,%a1@+
3522         movel   %a2@+,%a1@+
3523         movel   %a2@+,%a1@+
3524         movel   %a2@+,%a1@+
3525         movel   %a2@+,%a1@+
3526         dbra    %d6,L(console_scroll_loop)
3527
3528         lea     %pc@(L(mac_rowbytes)),%a0
3529         movel   %a0@,%d6
3530         movel   %pc@(L(console_font)),%a0
3531         mulul   %a0@(FONT_DESC_HEIGHT),%d6      /* scan line bytes x font height */
3532         divul   #32,%d6                 /* we'll move 8 words at a time */
3533         subq    #1,%d6
3534
3535         moveq   #-1,%d0
3536 L(console_scroll_clear_loop):
3537         movel   %d0,%a1@+
3538         movel   %d0,%a1@+
3539         movel   %d0,%a1@+
3540         movel   %d0,%a1@+
3541         movel   %d0,%a1@+
3542         movel   %d0,%a1@+
3543         movel   %d0,%a1@+
3544         movel   %d0,%a1@+
3545         dbra    %d6,L(console_scroll_clear_loop)
3546
3547 1:
3548 func_return     console_scroll
3549
3550
3551 func_start      console_putc,%a0/%a1/%d0-%d7
3552
3553         is_not_mac(L(console_exit))
3554         tstl    %pc@(L(console_font))
3555         jeq     L(console_exit)
3556
3557         /* Output character in d7 on console.
3558          */
3559         movel   ARG1,%d7
3560         cmpib   #'\n',%d7
3561         jbne    1f
3562
3563         /* A little safe recursion is good for the soul */
3564         console_putc    #'\r'
3565 1:
3566         lea     %pc@(L(console_globals)),%a0
3567
3568         cmpib   #10,%d7
3569         jne     L(console_not_lf)
3570         movel   %a0@(Lconsole_struct_cur_row),%d0
3571         addil   #1,%d0
3572         movel   %d0,%a0@(Lconsole_struct_cur_row)
3573         movel   %a0@(Lconsole_struct_num_rows),%d1
3574         cmpl    %d1,%d0
3575         jcs     1f
3576         subil   #1,%d0
3577         movel   %d0,%a0@(Lconsole_struct_cur_row)
3578         console_scroll
3579 1:
3580         jra     L(console_exit)
3581
3582 L(console_not_lf):
3583         cmpib   #13,%d7
3584         jne     L(console_not_cr)
3585         clrl    %a0@(Lconsole_struct_cur_column)
3586         jra     L(console_exit)
3587
3588 L(console_not_cr):
3589         cmpib   #1,%d7
3590         jne     L(console_not_home)
3591         clrl    %a0@(Lconsole_struct_cur_row)
3592         clrl    %a0@(Lconsole_struct_cur_column)
3593         jra     L(console_exit)
3594
3595 /*
3596  *      At this point we know that the %d7 character is going to be
3597  *      rendered on the screen.  Register usage is -
3598  *              a0 = pointer to console globals
3599  *              a1 = font data
3600  *              d0 = cursor column
3601  *              d1 = cursor row to draw the character
3602  *              d7 = character number
3603  */
3604 L(console_not_home):
3605         movel   %a0@(Lconsole_struct_cur_column),%d0
3606         addql   #1,%a0@(Lconsole_struct_cur_column)
3607         movel   %a0@(Lconsole_struct_num_columns),%d1
3608         cmpl    %d1,%d0
3609         jcs     1f
3610         console_putc    #'\n'   /* recursion is OK! */
3611 1:
3612         movel   %a0@(Lconsole_struct_cur_row),%d1
3613
3614         /*
3615          *      At this point we make a shift in register usage
3616          *      a0 = address of pointer to font data (fbcon_font_desc)
3617          */
3618         movel   %pc@(L(console_font)),%a0
3619         movel   %pc@(L(console_font_data)),%a1  /* Load fbcon_font_desc.data into a1 */
3620         andl    #0x000000ff,%d7
3621                 /* ASSERT: a0 = contents of Lconsole_font */
3622         mulul   %a0@(FONT_DESC_HEIGHT),%d7      /* d7 = index into font data */
3623         addl    %d7,%a1                 /* a1 = points to char image */
3624
3625         /*
3626          *      At this point we make a shift in register usage
3627          *      d0 = pixel coordinate, x
3628          *      d1 = pixel coordinate, y
3629          *      d2 = (bit 0) 1/0 for white/black (!) pixel on screen
3630          *      d3 = font scan line data (8 pixels)
3631          *      d6 = count down for the font's pixel width (8)
3632          *      d7 = count down for the font's pixel count in height
3633          */
3634                 /* ASSERT: a0 = contents of Lconsole_font */
3635         mulul   %a0@(FONT_DESC_WIDTH),%d0
3636         mulul   %a0@(FONT_DESC_HEIGHT),%d1
3637         movel   %a0@(FONT_DESC_HEIGHT),%d7      /* Load fbcon_font_desc.height into d7 */
3638         subq    #1,%d7
3639 L(console_read_char_scanline):
3640         moveb   %a1@+,%d3
3641
3642                 /* ASSERT: a0 = contents of Lconsole_font */
3643         movel   %a0@(FONT_DESC_WIDTH),%d6       /* Load fbcon_font_desc.width into d6 */
3644         subql   #1,%d6
3645
3646 L(console_do_font_scanline):
3647         lslb    #1,%d3
3648         scsb    %d2             /* convert 1 bit into a byte */
3649         console_plot_pixel %d0,%d1,%d2
3650         addq    #1,%d0
3651         dbra    %d6,L(console_do_font_scanline)
3652
3653                 /* ASSERT: a0 = contents of Lconsole_font */
3654         subl    %a0@(FONT_DESC_WIDTH),%d0
3655         addq    #1,%d1
3656         dbra    %d7,L(console_read_char_scanline)
3657
3658 L(console_exit):
3659 func_return     console_putc
3660
3661         /*
3662          *      Input:
3663          *              d0 = x coordinate
3664          *              d1 = y coordinate
3665          *              d2 = (bit 0) 1/0 for white/black (!)
3666          *      All registers are preserved
3667          */
3668 func_start      console_plot_pixel,%a0-%a1/%d0-%d4
3669
3670         movel   %pc@(L(mac_videobase)),%a1
3671         movel   %pc@(L(mac_videodepth)),%d3
3672         movel   ARG1,%d0
3673         movel   ARG2,%d1
3674         mulul   %pc@(L(mac_rowbytes)),%d1
3675         movel   ARG3,%d2
3676
3677         /*
3678          *      Register usage:
3679          *              d0 = x coord becomes byte offset into frame buffer
3680          *              d1 = y coord
3681          *              d2 = black or white (0/1)
3682          *              d3 = video depth
3683          *              d4 = temp of x (d0) for many bit depths
3684          */
3685 L(test_1bit):
3686         cmpb    #1,%d3
3687         jbne    L(test_2bit)
3688         movel   %d0,%d4         /* we need the low order 3 bits! */
3689         divul   #8,%d0
3690         addal   %d0,%a1
3691         addal   %d1,%a1
3692         andb    #7,%d4
3693         eorb    #7,%d4          /* reverse the x-coordinate w/ screen-bit # */
3694         andb    #1,%d2
3695         jbne    L(white_1)
3696         bsetb   %d4,%a1@
3697         jbra    L(console_plot_pixel_exit)
3698 L(white_1):
3699         bclrb   %d4,%a1@
3700         jbra    L(console_plot_pixel_exit)
3701
3702 L(test_2bit):
3703         cmpb    #2,%d3
3704         jbne    L(test_4bit)
3705         movel   %d0,%d4         /* we need the low order 2 bits! */
3706         divul   #4,%d0
3707         addal   %d0,%a1
3708         addal   %d1,%a1
3709         andb    #3,%d4
3710         eorb    #3,%d4          /* reverse the x-coordinate w/ screen-bit # */
3711         lsll    #1,%d4          /* ! */
3712         andb    #1,%d2
3713         jbne    L(white_2)
3714         bsetb   %d4,%a1@
3715         addq    #1,%d4
3716         bsetb   %d4,%a1@
3717         jbra    L(console_plot_pixel_exit)
3718 L(white_2):
3719         bclrb   %d4,%a1@
3720         addq    #1,%d4
3721         bclrb   %d4,%a1@
3722         jbra    L(console_plot_pixel_exit)
3723
3724 L(test_4bit):
3725         cmpb    #4,%d3
3726         jbne    L(test_8bit)
3727         movel   %d0,%d4         /* we need the low order bit! */
3728         divul   #2,%d0
3729         addal   %d0,%a1
3730         addal   %d1,%a1
3731         andb    #1,%d4
3732         eorb    #1,%d4
3733         lsll    #2,%d4          /* ! */
3734         andb    #1,%d2
3735         jbne    L(white_4)
3736         bsetb   %d4,%a1@
3737         addq    #1,%d4
3738         bsetb   %d4,%a1@
3739         addq    #1,%d4
3740         bsetb   %d4,%a1@
3741         addq    #1,%d4
3742         bsetb   %d4,%a1@
3743         jbra    L(console_plot_pixel_exit)
3744 L(white_4):
3745         bclrb   %d4,%a1@
3746         addq    #1,%d4
3747         bclrb   %d4,%a1@
3748         addq    #1,%d4
3749         bclrb   %d4,%a1@
3750         addq    #1,%d4
3751         bclrb   %d4,%a1@
3752         jbra    L(console_plot_pixel_exit)
3753
3754 L(test_8bit):
3755         cmpb    #8,%d3
3756         jbne    L(test_16bit)
3757         addal   %d0,%a1
3758         addal   %d1,%a1
3759         andb    #1,%d2
3760         jbne    L(white_8)
3761         moveb   #0xff,%a1@
3762         jbra    L(console_plot_pixel_exit)
3763 L(white_8):
3764         clrb    %a1@
3765         jbra    L(console_plot_pixel_exit)
3766
3767 L(test_16bit):
3768         cmpb    #16,%d3
3769         jbne    L(console_plot_pixel_exit)
3770         addal   %d0,%a1
3771         addal   %d0,%a1
3772         addal   %d1,%a1
3773         andb    #1,%d2
3774         jbne    L(white_16)
3775         clrw    %a1@
3776         jbra    L(console_plot_pixel_exit)
3777 L(white_16):
3778         movew   #0x0fff,%a1@
3779         jbra    L(console_plot_pixel_exit)
3780
3781 L(console_plot_pixel_exit):
3782 func_return     console_plot_pixel
3783 #endif /* CONSOLE */
3784
3785 #if 0
3786 /*
3787  * This is some old code lying around.  I don't believe
3788  * it's used or important anymore.  My guess is it contributed
3789  * to getting to this point, but it's done for now.
3790  * It was still in the 2.1.77 head.S, so it's still here.
3791  * (And still not used!)
3792  */
3793 L(showtest):
3794         moveml  %a0/%d7,%sp@-
3795         puts    "A="
3796         putn    %a1
3797
3798         .long   0xf0119f15              | ptestr        #5,%a1@,#7,%a0
3799
3800         puts    "DA="
3801         putn    %a0
3802
3803         puts    "D="
3804         putn    %a0@
3805
3806         puts    "S="
3807         lea     %pc@(L(mmu)),%a0
3808         .long   0xf0106200              | pmove         %psr,%a0@
3809         clrl    %d7
3810         movew   %a0@,%d7
3811         putn    %d7
3812
3813         putc    '\n'
3814         moveml  %sp@+,%a0/%d7
3815         rts
3816 #endif  /* 0 */
3817
3818 __INITDATA
3819         .align  4
3820
3821 #if defined(CONFIG_ATARI) || defined(CONFIG_AMIGA) || \
3822     defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
3823 L(custom):
3824 L(iobase):
3825         .long 0
3826 #endif
3827
3828 #if defined(CONSOLE)
3829 L(console_globals):
3830         .long   0               /* cursor column */
3831         .long   0               /* cursor row */
3832         .long   0               /* max num columns */
3833         .long   0               /* max num rows */
3834         .long   0               /* left edge */
3835         .long   0               /* mac putc */
3836 L(console_font):
3837         .long   0               /* pointer to console font (struct font_desc) */
3838 L(console_font_data):
3839         .long   0               /* pointer to console font data */
3840 #endif /* CONSOLE */
3841
3842 #if defined(MMU_PRINT)
3843 L(mmu_print_data):
3844         .long   0               /* valid flag */
3845         .long   0               /* start logical */
3846         .long   0               /* next logical */
3847         .long   0               /* start physical */
3848         .long   0               /* next physical */
3849 #endif /* MMU_PRINT */
3850
3851 L(cputype):
3852         .long   0
3853 L(mmu_cached_pointer_tables):
3854         .long   0
3855 L(mmu_num_pointer_tables):
3856         .long   0
3857 L(phys_kernel_start):
3858         .long   0
3859 L(kernel_end):
3860         .long   0
3861 L(memory_start):
3862         .long   0
3863 L(kernel_pgdir_ptr):
3864         .long   0
3865 L(temp_mmap_mem):
3866         .long   0
3867
3868 #if defined (CONFIG_MVME147)
3869 M147_SCC_CTRL_A = 0xfffe3002
3870 M147_SCC_DATA_A = 0xfffe3003
3871 #endif
3872
3873 #if defined (CONFIG_MVME16x)
3874 M162_SCC_CTRL_A = 0xfff45005
3875 M167_CYCAR = 0xfff450ee
3876 M167_CYIER = 0xfff45011
3877 M167_CYLICR = 0xfff45026
3878 M167_CYTEOIR = 0xfff45085
3879 M167_CYTDR = 0xfff450f8
3880 M167_PCSCCTICR = 0xfff4201e
3881 M167_PCTPIACKR = 0xfff42025
3882 #endif
3883
3884 #if defined (CONFIG_BVME6000)
3885 BVME_SCC_CTRL_A = 0xffb0000b
3886 BVME_SCC_DATA_A = 0xffb0000f
3887 #endif
3888
3889 #if defined(CONFIG_MAC)
3890 L(mac_booter_data):
3891         .long   0
3892 L(mac_videobase):
3893         .long   0
3894 L(mac_videodepth):
3895         .long   0
3896 L(mac_dimensions):
3897         .long   0
3898 L(mac_rowbytes):
3899         .long   0
3900 #ifdef SERIAL_DEBUG
3901 L(mac_sccbase):
3902         .long   0
3903 #endif
3904 #endif /* CONFIG_MAC */
3905
3906 #if defined (CONFIG_APOLLO)
3907 LSRB0        = 0x10412
3908 LTHRB0       = 0x10416
3909 LCPUCTRL     = 0x10100
3910 #endif
3911
3912 #if defined(CONFIG_HP300)
3913 DCADATA      = 0x11
3914 DCALSR       = 0x1b
3915 APCIDATA     = 0x00
3916 APCILSR      = 0x14
3917 L(uartbase):
3918         .long   0
3919 L(uart_scode):
3920         .long   -1
3921 #endif
3922
3923 __FINIT
3924         .data
3925         .align  4
3926
3927 availmem:
3928         .long   0
3929 m68k_pgtable_cachemode:
3930         .long   0
3931 m68k_supervisor_cachemode:
3932         .long   0
3933 #if defined(CONFIG_MVME16x)
3934 mvme_bdid:
3935         .long   0,0,0,0,0,0,0,0
3936 #endif
3937 #if defined(CONFIG_Q40)
3938 q40_mem_cptr:
3939         .long   0
3940 L(q40_do_debug):
3941         .long   0
3942 #endif