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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/boot/compressed/head.S | |
3 | * | |
4 | * Copyright (C) 1996-2002 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/config.h> | |
11 | #include <linux/linkage.h> | |
12 | ||
13 | /* | |
14 | * Debugging stuff | |
15 | * | |
16 | * Note that these macros must not contain any code which is not | |
17 | * 100% relocatable. Any attempt to do so will result in a crash. | |
18 | * Please select one of the following when turning on debugging. | |
19 | */ | |
20 | #ifdef DEBUG | |
5cd0c344 | 21 | |
5cd0c344 | 22 | #if defined(CONFIG_DEBUG_ICEDCC) |
1da177e4 LT |
23 | .macro loadsp, rb |
24 | .endm | |
224b5be6 | 25 | .macro writeb, ch, rb |
5cd0c344 | 26 | mcr p14, 0, \ch, c0, c1, 0 |
1da177e4 | 27 | .endm |
5cd0c344 | 28 | #else |
224b5be6 RK |
29 | |
30 | #include <asm/arch/debug-macro.S> | |
31 | ||
5cd0c344 RK |
32 | .macro writeb, ch, rb |
33 | senduart \ch, \rb | |
1da177e4 | 34 | .endm |
5cd0c344 | 35 | |
224b5be6 | 36 | #if defined(CONFIG_ARCH_SA1100) |
1da177e4 LT |
37 | .macro loadsp, rb |
38 | mov \rb, #0x80000000 @ physical base address | |
224b5be6 | 39 | #ifdef CONFIG_DEBUG_LL_SER3 |
1da177e4 | 40 | add \rb, \rb, #0x00050000 @ Ser3 |
224b5be6 | 41 | #else |
1da177e4 | 42 | add \rb, \rb, #0x00010000 @ Ser1 |
224b5be6 | 43 | #endif |
1da177e4 | 44 | .endm |
1da177e4 LT |
45 | #elif defined(CONFIG_ARCH_IOP331) |
46 | .macro loadsp, rb | |
47 | mov \rb, #0xff000000 | |
48 | orr \rb, \rb, #0x00ff0000 | |
49 | orr \rb, \rb, #0x0000f700 @ location of the UART | |
50 | .endm | |
1da177e4 | 51 | #elif defined(CONFIG_ARCH_S3C2410) |
5cd0c344 | 52 | .macro loadsp, rb |
1da177e4 LT |
53 | mov \rb, #0x50000000 |
54 | add \rb, \rb, #0x4000 * CONFIG_S3C2410_LOWLEVEL_UART_PORT | |
55 | .endm | |
1da177e4 | 56 | #else |
224b5be6 RK |
57 | .macro loadsp, rb |
58 | addruart \rb | |
59 | .endm | |
1da177e4 | 60 | #endif |
5cd0c344 | 61 | #endif |
1da177e4 LT |
62 | #endif |
63 | ||
64 | .macro kputc,val | |
65 | mov r0, \val | |
66 | bl putc | |
67 | .endm | |
68 | ||
69 | .macro kphex,val,len | |
70 | mov r0, \val | |
71 | mov r1, #\len | |
72 | bl phex | |
73 | .endm | |
74 | ||
75 | .macro debug_reloc_start | |
76 | #ifdef DEBUG | |
77 | kputc #'\n' | |
78 | kphex r6, 8 /* processor id */ | |
79 | kputc #':' | |
80 | kphex r7, 8 /* architecture id */ | |
81 | kputc #':' | |
82 | mrc p15, 0, r0, c1, c0 | |
83 | kphex r0, 8 /* control reg */ | |
84 | kputc #'\n' | |
85 | kphex r5, 8 /* decompressed kernel start */ | |
86 | kputc #'-' | |
f4619025 | 87 | kphex r9, 8 /* decompressed kernel end */ |
1da177e4 LT |
88 | kputc #'>' |
89 | kphex r4, 8 /* kernel execution address */ | |
90 | kputc #'\n' | |
91 | #endif | |
92 | .endm | |
93 | ||
94 | .macro debug_reloc_end | |
95 | #ifdef DEBUG | |
96 | kphex r5, 8 /* end of kernel */ | |
97 | kputc #'\n' | |
98 | mov r0, r4 | |
99 | bl memdump /* dump 256 bytes at start of kernel */ | |
100 | #endif | |
101 | .endm | |
102 | ||
103 | .section ".start", #alloc, #execinstr | |
104 | /* | |
105 | * sort out different calling conventions | |
106 | */ | |
107 | .align | |
108 | start: | |
109 | .type start,#function | |
110 | .rept 8 | |
111 | mov r0, r0 | |
112 | .endr | |
113 | ||
114 | b 1f | |
115 | .word 0x016f2818 @ Magic numbers to help the loader | |
116 | .word start @ absolute load/run zImage address | |
117 | .word _edata @ zImage end address | |
118 | 1: mov r7, r1 @ save architecture ID | |
f4619025 | 119 | mov r8, r2 @ save atags pointer |
1da177e4 LT |
120 | |
121 | #ifndef __ARM_ARCH_2__ | |
122 | /* | |
123 | * Booting from Angel - need to enter SVC mode and disable | |
124 | * FIQs/IRQs (numeric definitions from angel arm.h source). | |
125 | * We only do this if we were in user mode on entry. | |
126 | */ | |
127 | mrs r2, cpsr @ get current mode | |
128 | tst r2, #3 @ not user? | |
129 | bne not_angel | |
130 | mov r0, #0x17 @ angel_SWIreason_EnterSVC | |
131 | swi 0x123456 @ angel_SWI_ARM | |
132 | not_angel: | |
133 | mrs r2, cpsr @ turn off interrupts to | |
134 | orr r2, r2, #0xc0 @ prevent angel from running | |
135 | msr cpsr_c, r2 | |
136 | #else | |
137 | teqp pc, #0x0c000003 @ turn off interrupts | |
138 | #endif | |
139 | ||
140 | /* | |
141 | * Note that some cache flushing and other stuff may | |
142 | * be needed here - is there an Angel SWI call for this? | |
143 | */ | |
144 | ||
145 | /* | |
146 | * some architecture specific code can be inserted | |
f4619025 | 147 | * by the linker here, but it should preserve r7, r8, and r9. |
1da177e4 LT |
148 | */ |
149 | ||
150 | .text | |
151 | adr r0, LC0 | |
152 | ldmia r0, {r1, r2, r3, r4, r5, r6, ip, sp} | |
153 | subs r0, r0, r1 @ calculate the delta offset | |
154 | ||
155 | @ if delta is zero, we are | |
156 | beq not_relocated @ running at the address we | |
157 | @ were linked at. | |
158 | ||
159 | /* | |
160 | * We're running at a different address. We need to fix | |
161 | * up various pointers: | |
162 | * r5 - zImage base address | |
163 | * r6 - GOT start | |
164 | * ip - GOT end | |
165 | */ | |
166 | add r5, r5, r0 | |
167 | add r6, r6, r0 | |
168 | add ip, ip, r0 | |
169 | ||
170 | #ifndef CONFIG_ZBOOT_ROM | |
171 | /* | |
172 | * If we're running fully PIC === CONFIG_ZBOOT_ROM = n, | |
173 | * we need to fix up pointers into the BSS region. | |
174 | * r2 - BSS start | |
175 | * r3 - BSS end | |
176 | * sp - stack pointer | |
177 | */ | |
178 | add r2, r2, r0 | |
179 | add r3, r3, r0 | |
180 | add sp, sp, r0 | |
181 | ||
182 | /* | |
183 | * Relocate all entries in the GOT table. | |
184 | */ | |
185 | 1: ldr r1, [r6, #0] @ relocate entries in the GOT | |
186 | add r1, r1, r0 @ table. This fixes up the | |
187 | str r1, [r6], #4 @ C references. | |
188 | cmp r6, ip | |
189 | blo 1b | |
190 | #else | |
191 | ||
192 | /* | |
193 | * Relocate entries in the GOT table. We only relocate | |
194 | * the entries that are outside the (relocated) BSS region. | |
195 | */ | |
196 | 1: ldr r1, [r6, #0] @ relocate entries in the GOT | |
197 | cmp r1, r2 @ entry < bss_start || | |
198 | cmphs r3, r1 @ _end < entry | |
199 | addlo r1, r1, r0 @ table. This fixes up the | |
200 | str r1, [r6], #4 @ C references. | |
201 | cmp r6, ip | |
202 | blo 1b | |
203 | #endif | |
204 | ||
205 | not_relocated: mov r0, #0 | |
206 | 1: str r0, [r2], #4 @ clear bss | |
207 | str r0, [r2], #4 | |
208 | str r0, [r2], #4 | |
209 | str r0, [r2], #4 | |
210 | cmp r2, r3 | |
211 | blo 1b | |
212 | ||
213 | /* | |
214 | * The C runtime environment should now be setup | |
215 | * sufficiently. Turn the cache on, set up some | |
216 | * pointers, and start decompressing. | |
217 | */ | |
218 | bl cache_on | |
219 | ||
220 | mov r1, sp @ malloc space above stack | |
221 | add r2, sp, #0x10000 @ 64k max | |
222 | ||
223 | /* | |
224 | * Check to see if we will overwrite ourselves. | |
225 | * r4 = final kernel address | |
226 | * r5 = start of this image | |
227 | * r2 = end of malloc space (and therefore this image) | |
228 | * We basically want: | |
229 | * r4 >= r2 -> OK | |
230 | * r4 + image length <= r5 -> OK | |
231 | */ | |
232 | cmp r4, r2 | |
233 | bhs wont_overwrite | |
234 | add r0, r4, #4096*1024 @ 4MB largest kernel size | |
235 | cmp r0, r5 | |
236 | bls wont_overwrite | |
237 | ||
238 | mov r5, r2 @ decompress after malloc space | |
239 | mov r0, r5 | |
240 | mov r3, r7 | |
241 | bl decompress_kernel | |
242 | ||
243 | add r0, r0, #127 | |
244 | bic r0, r0, #127 @ align the kernel length | |
245 | /* | |
246 | * r0 = decompressed kernel length | |
247 | * r1-r3 = unused | |
248 | * r4 = kernel execution address | |
249 | * r5 = decompressed kernel start | |
250 | * r6 = processor ID | |
251 | * r7 = architecture ID | |
f4619025 RK |
252 | * r8 = atags pointer |
253 | * r9-r14 = corrupted | |
1da177e4 LT |
254 | */ |
255 | add r1, r5, r0 @ end of decompressed kernel | |
256 | adr r2, reloc_start | |
257 | ldr r3, LC1 | |
258 | add r3, r2, r3 | |
f4619025 RK |
259 | 1: ldmia r2!, {r9 - r14} @ copy relocation code |
260 | stmia r1!, {r9 - r14} | |
261 | ldmia r2!, {r9 - r14} | |
262 | stmia r1!, {r9 - r14} | |
1da177e4 LT |
263 | cmp r2, r3 |
264 | blo 1b | |
265 | ||
266 | bl cache_clean_flush | |
267 | add pc, r5, r0 @ call relocation code | |
268 | ||
269 | /* | |
270 | * We're not in danger of overwriting ourselves. Do this the simple way. | |
271 | * | |
272 | * r4 = kernel execution address | |
273 | * r7 = architecture ID | |
274 | */ | |
275 | wont_overwrite: mov r0, r4 | |
276 | mov r3, r7 | |
277 | bl decompress_kernel | |
278 | b call_kernel | |
279 | ||
280 | .type LC0, #object | |
281 | LC0: .word LC0 @ r1 | |
282 | .word __bss_start @ r2 | |
283 | .word _end @ r3 | |
284 | .word zreladdr @ r4 | |
285 | .word _start @ r5 | |
286 | .word _got_start @ r6 | |
287 | .word _got_end @ ip | |
288 | .word user_stack+4096 @ sp | |
289 | LC1: .word reloc_end - reloc_start | |
290 | .size LC0, . - LC0 | |
291 | ||
292 | #ifdef CONFIG_ARCH_RPC | |
293 | .globl params | |
294 | params: ldr r0, =params_phys | |
295 | mov pc, lr | |
296 | .ltorg | |
297 | .align | |
298 | #endif | |
299 | ||
300 | /* | |
301 | * Turn on the cache. We need to setup some page tables so that we | |
302 | * can have both the I and D caches on. | |
303 | * | |
304 | * We place the page tables 16k down from the kernel execution address, | |
305 | * and we hope that nothing else is using it. If we're using it, we | |
306 | * will go pop! | |
307 | * | |
308 | * On entry, | |
309 | * r4 = kernel execution address | |
310 | * r6 = processor ID | |
311 | * r7 = architecture number | |
f4619025 RK |
312 | * r8 = atags pointer |
313 | * r9 = run-time address of "start" (???) | |
1da177e4 | 314 | * On exit, |
f4619025 | 315 | * r1, r2, r3, r9, r10, r12 corrupted |
1da177e4 | 316 | * This routine must preserve: |
f4619025 | 317 | * r4, r5, r6, r7, r8 |
1da177e4 LT |
318 | */ |
319 | .align 5 | |
320 | cache_on: mov r3, #8 @ cache_on function | |
321 | b call_cache_fn | |
322 | ||
323 | __setup_mmu: sub r3, r4, #16384 @ Page directory size | |
324 | bic r3, r3, #0xff @ Align the pointer | |
325 | bic r3, r3, #0x3f00 | |
326 | /* | |
327 | * Initialise the page tables, turning on the cacheable and bufferable | |
328 | * bits for the RAM area only. | |
329 | */ | |
330 | mov r0, r3 | |
f4619025 RK |
331 | mov r9, r0, lsr #18 |
332 | mov r9, r9, lsl #18 @ start of RAM | |
333 | add r10, r9, #0x10000000 @ a reasonable RAM size | |
1da177e4 LT |
334 | mov r1, #0x12 |
335 | orr r1, r1, #3 << 10 | |
336 | add r2, r3, #16384 | |
265d5e48 | 337 | 1: cmp r1, r9 @ if virt > start of RAM |
1da177e4 | 338 | orrhs r1, r1, #0x0c @ set cacheable, bufferable |
f4619025 | 339 | cmp r1, r10 @ if virt > end of RAM |
1da177e4 LT |
340 | bichs r1, r1, #0x0c @ clear cacheable, bufferable |
341 | str r1, [r0], #4 @ 1:1 mapping | |
342 | add r1, r1, #1048576 | |
343 | teq r0, r2 | |
344 | bne 1b | |
345 | /* | |
346 | * If ever we are running from Flash, then we surely want the cache | |
347 | * to be enabled also for our execution instance... We map 2MB of it | |
348 | * so there is no map overlap problem for up to 1 MB compressed kernel. | |
349 | * If the execution is in RAM then we would only be duplicating the above. | |
350 | */ | |
351 | mov r1, #0x1e | |
352 | orr r1, r1, #3 << 10 | |
353 | mov r2, pc, lsr #20 | |
354 | orr r1, r1, r2, lsl #20 | |
355 | add r0, r3, r2, lsl #2 | |
356 | str r1, [r0], #4 | |
357 | add r1, r1, #1048576 | |
358 | str r1, [r0] | |
359 | mov pc, lr | |
360 | ||
361 | __armv4_cache_on: | |
362 | mov r12, lr | |
363 | bl __setup_mmu | |
364 | mov r0, #0 | |
365 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer | |
366 | mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs | |
367 | mrc p15, 0, r0, c1, c0, 0 @ read control reg | |
368 | orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement | |
369 | orr r0, r0, #0x0030 | |
370 | bl __common_cache_on | |
371 | mov r0, #0 | |
372 | mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs | |
373 | mov pc, r12 | |
374 | ||
375 | __arm6_cache_on: | |
376 | mov r12, lr | |
377 | bl __setup_mmu | |
378 | mov r0, #0 | |
379 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 | |
380 | mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3 | |
381 | mov r0, #0x30 | |
382 | bl __common_cache_on | |
383 | mov r0, #0 | |
384 | mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3 | |
385 | mov pc, r12 | |
386 | ||
387 | __common_cache_on: | |
388 | #ifndef DEBUG | |
389 | orr r0, r0, #0x000d @ Write buffer, mmu | |
390 | #endif | |
391 | mov r1, #-1 | |
392 | mcr p15, 0, r3, c2, c0, 0 @ load page table pointer | |
393 | mcr p15, 0, r1, c3, c0, 0 @ load domain access control | |
394 | mcr p15, 0, r0, c1, c0, 0 @ load control register | |
395 | mov pc, lr | |
396 | ||
397 | /* | |
398 | * All code following this line is relocatable. It is relocated by | |
399 | * the above code to the end of the decompressed kernel image and | |
400 | * executed there. During this time, we have no stacks. | |
401 | * | |
402 | * r0 = decompressed kernel length | |
403 | * r1-r3 = unused | |
404 | * r4 = kernel execution address | |
405 | * r5 = decompressed kernel start | |
406 | * r6 = processor ID | |
407 | * r7 = architecture ID | |
f4619025 RK |
408 | * r8 = atags pointer |
409 | * r9-r14 = corrupted | |
1da177e4 LT |
410 | */ |
411 | .align 5 | |
f4619025 | 412 | reloc_start: add r9, r5, r0 |
1da177e4 LT |
413 | debug_reloc_start |
414 | mov r1, r4 | |
415 | 1: | |
416 | .rept 4 | |
f4619025 RK |
417 | ldmia r5!, {r0, r2, r3, r10 - r14} @ relocate kernel |
418 | stmia r1!, {r0, r2, r3, r10 - r14} | |
1da177e4 LT |
419 | .endr |
420 | ||
f4619025 | 421 | cmp r5, r9 |
1da177e4 LT |
422 | blo 1b |
423 | debug_reloc_end | |
424 | ||
425 | call_kernel: bl cache_clean_flush | |
426 | bl cache_off | |
f4619025 | 427 | mov r0, #0 @ must be zero |
1da177e4 | 428 | mov r1, r7 @ restore architecture number |
f4619025 | 429 | mov r2, r8 @ restore atags pointer |
1da177e4 LT |
430 | mov pc, r4 @ call kernel |
431 | ||
432 | /* | |
433 | * Here follow the relocatable cache support functions for the | |
434 | * various processors. This is a generic hook for locating an | |
435 | * entry and jumping to an instruction at the specified offset | |
436 | * from the start of the block. Please note this is all position | |
437 | * independent code. | |
438 | * | |
439 | * r1 = corrupted | |
440 | * r2 = corrupted | |
441 | * r3 = block offset | |
442 | * r6 = corrupted | |
443 | * r12 = corrupted | |
444 | */ | |
445 | ||
446 | call_cache_fn: adr r12, proc_types | |
447 | mrc p15, 0, r6, c0, c0 @ get processor ID | |
448 | 1: ldr r1, [r12, #0] @ get value | |
449 | ldr r2, [r12, #4] @ get mask | |
450 | eor r1, r1, r6 @ (real ^ match) | |
451 | tst r1, r2 @ & mask | |
452 | addeq pc, r12, r3 @ call cache function | |
453 | add r12, r12, #4*5 | |
454 | b 1b | |
455 | ||
456 | /* | |
457 | * Table for cache operations. This is basically: | |
458 | * - CPU ID match | |
459 | * - CPU ID mask | |
460 | * - 'cache on' method instruction | |
461 | * - 'cache off' method instruction | |
462 | * - 'cache flush' method instruction | |
463 | * | |
464 | * We match an entry using: ((real_id ^ match) & mask) == 0 | |
465 | * | |
466 | * Writethrough caches generally only need 'on' and 'off' | |
467 | * methods. Writeback caches _must_ have the flush method | |
468 | * defined. | |
469 | */ | |
470 | .type proc_types,#object | |
471 | proc_types: | |
472 | .word 0x41560600 @ ARM6/610 | |
473 | .word 0xffffffe0 | |
474 | b __arm6_cache_off @ works, but slow | |
475 | b __arm6_cache_off | |
476 | mov pc, lr | |
477 | @ b __arm6_cache_on @ untested | |
478 | @ b __arm6_cache_off | |
479 | @ b __armv3_cache_flush | |
480 | ||
481 | .word 0x00000000 @ old ARM ID | |
482 | .word 0x0000f000 | |
483 | mov pc, lr | |
484 | mov pc, lr | |
485 | mov pc, lr | |
486 | ||
487 | .word 0x41007000 @ ARM7/710 | |
488 | .word 0xfff8fe00 | |
489 | b __arm7_cache_off | |
490 | b __arm7_cache_off | |
491 | mov pc, lr | |
492 | ||
493 | .word 0x41807200 @ ARM720T (writethrough) | |
494 | .word 0xffffff00 | |
495 | b __armv4_cache_on | |
496 | b __armv4_cache_off | |
497 | mov pc, lr | |
498 | ||
499 | .word 0x00007000 @ ARM7 IDs | |
500 | .word 0x0000f000 | |
501 | mov pc, lr | |
502 | mov pc, lr | |
503 | mov pc, lr | |
504 | ||
505 | @ Everything from here on will be the new ID system. | |
506 | ||
507 | .word 0x4401a100 @ sa110 / sa1100 | |
508 | .word 0xffffffe0 | |
509 | b __armv4_cache_on | |
510 | b __armv4_cache_off | |
511 | b __armv4_cache_flush | |
512 | ||
513 | .word 0x6901b110 @ sa1110 | |
514 | .word 0xfffffff0 | |
515 | b __armv4_cache_on | |
516 | b __armv4_cache_off | |
517 | b __armv4_cache_flush | |
518 | ||
519 | @ These match on the architecture ID | |
520 | ||
521 | .word 0x00020000 @ ARMv4T | |
522 | .word 0x000f0000 | |
523 | b __armv4_cache_on | |
524 | b __armv4_cache_off | |
525 | b __armv4_cache_flush | |
526 | ||
527 | .word 0x00050000 @ ARMv5TE | |
528 | .word 0x000f0000 | |
529 | b __armv4_cache_on | |
530 | b __armv4_cache_off | |
531 | b __armv4_cache_flush | |
532 | ||
533 | .word 0x00060000 @ ARMv5TEJ | |
534 | .word 0x000f0000 | |
535 | b __armv4_cache_on | |
536 | b __armv4_cache_off | |
537 | b __armv4_cache_flush | |
538 | ||
539 | .word 0x00070000 @ ARMv6 | |
540 | .word 0x000f0000 | |
541 | b __armv4_cache_on | |
542 | b __armv4_cache_off | |
543 | b __armv6_cache_flush | |
544 | ||
545 | .word 0 @ unrecognised type | |
546 | .word 0 | |
547 | mov pc, lr | |
548 | mov pc, lr | |
549 | mov pc, lr | |
550 | ||
551 | .size proc_types, . - proc_types | |
552 | ||
553 | /* | |
554 | * Turn off the Cache and MMU. ARMv3 does not support | |
555 | * reading the control register, but ARMv4 does. | |
556 | * | |
557 | * On entry, r6 = processor ID | |
558 | * On exit, r0, r1, r2, r3, r12 corrupted | |
559 | * This routine must preserve: r4, r6, r7 | |
560 | */ | |
561 | .align 5 | |
562 | cache_off: mov r3, #12 @ cache_off function | |
563 | b call_cache_fn | |
564 | ||
565 | __armv4_cache_off: | |
566 | mrc p15, 0, r0, c1, c0 | |
567 | bic r0, r0, #0x000d | |
568 | mcr p15, 0, r0, c1, c0 @ turn MMU and cache off | |
569 | mov r0, #0 | |
570 | mcr p15, 0, r0, c7, c7 @ invalidate whole cache v4 | |
571 | mcr p15, 0, r0, c8, c7 @ invalidate whole TLB v4 | |
572 | mov pc, lr | |
573 | ||
574 | __arm6_cache_off: | |
575 | mov r0, #0x00000030 @ ARM6 control reg. | |
576 | b __armv3_cache_off | |
577 | ||
578 | __arm7_cache_off: | |
579 | mov r0, #0x00000070 @ ARM7 control reg. | |
580 | b __armv3_cache_off | |
581 | ||
582 | __armv3_cache_off: | |
583 | mcr p15, 0, r0, c1, c0, 0 @ turn MMU and cache off | |
584 | mov r0, #0 | |
585 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 | |
586 | mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3 | |
587 | mov pc, lr | |
588 | ||
589 | /* | |
590 | * Clean and flush the cache to maintain consistency. | |
591 | * | |
592 | * On entry, | |
593 | * r6 = processor ID | |
594 | * On exit, | |
595 | * r1, r2, r3, r11, r12 corrupted | |
596 | * This routine must preserve: | |
597 | * r0, r4, r5, r6, r7 | |
598 | */ | |
599 | .align 5 | |
600 | cache_clean_flush: | |
601 | mov r3, #16 | |
602 | b call_cache_fn | |
603 | ||
604 | __armv6_cache_flush: | |
605 | mov r1, #0 | |
606 | mcr p15, 0, r1, c7, c14, 0 @ clean+invalidate D | |
607 | mcr p15, 0, r1, c7, c5, 0 @ invalidate I+BTB | |
608 | mcr p15, 0, r1, c7, c15, 0 @ clean+invalidate unified | |
609 | mcr p15, 0, r1, c7, c10, 4 @ drain WB | |
610 | mov pc, lr | |
611 | ||
612 | __armv4_cache_flush: | |
613 | mov r2, #64*1024 @ default: 32K dcache size (*2) | |
614 | mov r11, #32 @ default: 32 byte line size | |
615 | mrc p15, 0, r3, c0, c0, 1 @ read cache type | |
616 | teq r3, r6 @ cache ID register present? | |
617 | beq no_cache_id | |
618 | mov r1, r3, lsr #18 | |
619 | and r1, r1, #7 | |
620 | mov r2, #1024 | |
621 | mov r2, r2, lsl r1 @ base dcache size *2 | |
622 | tst r3, #1 << 14 @ test M bit | |
623 | addne r2, r2, r2, lsr #1 @ +1/2 size if M == 1 | |
624 | mov r3, r3, lsr #12 | |
625 | and r3, r3, #3 | |
626 | mov r11, #8 | |
627 | mov r11, r11, lsl r3 @ cache line size in bytes | |
628 | no_cache_id: | |
629 | bic r1, pc, #63 @ align to longest cache line | |
630 | add r2, r1, r2 | |
631 | 1: ldr r3, [r1], r11 @ s/w flush D cache | |
632 | teq r1, r2 | |
633 | bne 1b | |
634 | ||
635 | mcr p15, 0, r1, c7, c5, 0 @ flush I cache | |
636 | mcr p15, 0, r1, c7, c6, 0 @ flush D cache | |
637 | mcr p15, 0, r1, c7, c10, 4 @ drain WB | |
638 | mov pc, lr | |
639 | ||
640 | __armv3_cache_flush: | |
641 | mov r1, #0 | |
642 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 | |
643 | mov pc, lr | |
644 | ||
645 | /* | |
646 | * Various debugging routines for printing hex characters and | |
647 | * memory, which again must be relocatable. | |
648 | */ | |
649 | #ifdef DEBUG | |
650 | .type phexbuf,#object | |
651 | phexbuf: .space 12 | |
652 | .size phexbuf, . - phexbuf | |
653 | ||
654 | phex: adr r3, phexbuf | |
655 | mov r2, #0 | |
656 | strb r2, [r3, r1] | |
657 | 1: subs r1, r1, #1 | |
658 | movmi r0, r3 | |
659 | bmi puts | |
660 | and r2, r0, #15 | |
661 | mov r0, r0, lsr #4 | |
662 | cmp r2, #10 | |
663 | addge r2, r2, #7 | |
664 | add r2, r2, #'0' | |
665 | strb r2, [r3, r1] | |
666 | b 1b | |
667 | ||
668 | puts: loadsp r3 | |
669 | 1: ldrb r2, [r0], #1 | |
670 | teq r2, #0 | |
671 | moveq pc, lr | |
5cd0c344 | 672 | 2: writeb r2, r3 |
1da177e4 LT |
673 | mov r1, #0x00020000 |
674 | 3: subs r1, r1, #1 | |
675 | bne 3b | |
676 | teq r2, #'\n' | |
677 | moveq r2, #'\r' | |
678 | beq 2b | |
679 | teq r0, #0 | |
680 | bne 1b | |
681 | mov pc, lr | |
682 | putc: | |
683 | mov r2, r0 | |
684 | mov r0, #0 | |
685 | loadsp r3 | |
686 | b 2b | |
687 | ||
688 | memdump: mov r12, r0 | |
689 | mov r10, lr | |
690 | mov r11, #0 | |
691 | 2: mov r0, r11, lsl #2 | |
692 | add r0, r0, r12 | |
693 | mov r1, #8 | |
694 | bl phex | |
695 | mov r0, #':' | |
696 | bl putc | |
697 | 1: mov r0, #' ' | |
698 | bl putc | |
699 | ldr r0, [r12, r11, lsl #2] | |
700 | mov r1, #8 | |
701 | bl phex | |
702 | and r0, r11, #7 | |
703 | teq r0, #3 | |
704 | moveq r0, #' ' | |
705 | bleq putc | |
706 | and r0, r11, #7 | |
707 | add r11, r11, #1 | |
708 | teq r0, #7 | |
709 | bne 1b | |
710 | mov r0, #'\n' | |
711 | bl putc | |
712 | cmp r11, #64 | |
713 | blt 2b | |
714 | mov pc, r10 | |
715 | #endif | |
716 | ||
717 | reloc_end: | |
718 | ||
719 | .align | |
720 | .section ".stack", "w" | |
721 | user_stack: .space 4096 |