Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/boot/compressed/head.S | |
3 | * | |
4 | * Copyright (C) 1996-2002 Russell King | |
10c2df65 | 5 | * Copyright (C) 2004 Hyok S. Choi (MPU support) |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
1da177e4 | 11 | #include <linux/linkage.h> |
424e5994 | 12 | #include <asm/assembler.h> |
1da177e4 | 13 | |
da94a829 | 14 | .arch armv7-a |
1da177e4 LT |
15 | /* |
16 | * Debugging stuff | |
17 | * | |
18 | * Note that these macros must not contain any code which is not | |
19 | * 100% relocatable. Any attempt to do so will result in a crash. | |
20 | * Please select one of the following when turning on debugging. | |
21 | */ | |
22 | #ifdef DEBUG | |
5cd0c344 | 23 | |
5cd0c344 | 24 | #if defined(CONFIG_DEBUG_ICEDCC) |
7d95ded9 | 25 | |
dfad549d | 26 | #if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7) |
4e6d488a | 27 | .macro loadsp, rb, tmp |
7d95ded9 TL |
28 | .endm |
29 | .macro writeb, ch, rb | |
30 | mcr p14, 0, \ch, c0, c5, 0 | |
31 | .endm | |
c633c3cf | 32 | #elif defined(CONFIG_CPU_XSCALE) |
4e6d488a | 33 | .macro loadsp, rb, tmp |
c633c3cf JCPV |
34 | .endm |
35 | .macro writeb, ch, rb | |
36 | mcr p14, 0, \ch, c8, c0, 0 | |
37 | .endm | |
7d95ded9 | 38 | #else |
4e6d488a | 39 | .macro loadsp, rb, tmp |
1da177e4 | 40 | .endm |
224b5be6 | 41 | .macro writeb, ch, rb |
41a9e680 | 42 | mcr p14, 0, \ch, c1, c0, 0 |
1da177e4 | 43 | .endm |
7d95ded9 TL |
44 | #endif |
45 | ||
5cd0c344 | 46 | #else |
224b5be6 | 47 | |
4beba08b | 48 | #include CONFIG_DEBUG_LL_INCLUDE |
224b5be6 | 49 | |
5cd0c344 RK |
50 | .macro writeb, ch, rb |
51 | senduart \ch, \rb | |
1da177e4 | 52 | .endm |
5cd0c344 | 53 | |
224b5be6 | 54 | #if defined(CONFIG_ARCH_SA1100) |
4e6d488a | 55 | .macro loadsp, rb, tmp |
1da177e4 | 56 | mov \rb, #0x80000000 @ physical base address |
224b5be6 | 57 | #ifdef CONFIG_DEBUG_LL_SER3 |
1da177e4 | 58 | add \rb, \rb, #0x00050000 @ Ser3 |
224b5be6 | 59 | #else |
1da177e4 | 60 | add \rb, \rb, #0x00010000 @ Ser1 |
224b5be6 | 61 | #endif |
1da177e4 | 62 | .endm |
b130d5c2 | 63 | #elif defined(CONFIG_ARCH_S3C24XX) |
4e6d488a | 64 | .macro loadsp, rb, tmp |
1da177e4 | 65 | mov \rb, #0x50000000 |
c7657846 | 66 | add \rb, \rb, #0x4000 * CONFIG_S3C_LOWLEVEL_UART_PORT |
1da177e4 | 67 | .endm |
1da177e4 | 68 | #else |
4e6d488a TL |
69 | .macro loadsp, rb, tmp |
70 | addruart \rb, \tmp | |
224b5be6 | 71 | .endm |
1da177e4 | 72 | #endif |
5cd0c344 | 73 | #endif |
1da177e4 LT |
74 | #endif |
75 | ||
76 | .macro kputc,val | |
77 | mov r0, \val | |
78 | bl putc | |
79 | .endm | |
80 | ||
81 | .macro kphex,val,len | |
82 | mov r0, \val | |
83 | mov r1, #\len | |
84 | bl phex | |
85 | .endm | |
86 | ||
87 | .macro debug_reloc_start | |
88 | #ifdef DEBUG | |
89 | kputc #'\n' | |
90 | kphex r6, 8 /* processor id */ | |
91 | kputc #':' | |
92 | kphex r7, 8 /* architecture id */ | |
f12d0d7c | 93 | #ifdef CONFIG_CPU_CP15 |
1da177e4 LT |
94 | kputc #':' |
95 | mrc p15, 0, r0, c1, c0 | |
96 | kphex r0, 8 /* control reg */ | |
f12d0d7c | 97 | #endif |
1da177e4 LT |
98 | kputc #'\n' |
99 | kphex r5, 8 /* decompressed kernel start */ | |
100 | kputc #'-' | |
f4619025 | 101 | kphex r9, 8 /* decompressed kernel end */ |
1da177e4 LT |
102 | kputc #'>' |
103 | kphex r4, 8 /* kernel execution address */ | |
104 | kputc #'\n' | |
105 | #endif | |
106 | .endm | |
107 | ||
108 | .macro debug_reloc_end | |
109 | #ifdef DEBUG | |
110 | kphex r5, 8 /* end of kernel */ | |
111 | kputc #'\n' | |
112 | mov r0, r4 | |
113 | bl memdump /* dump 256 bytes at start of kernel */ | |
114 | #endif | |
115 | .endm | |
116 | ||
117 | .section ".start", #alloc, #execinstr | |
118 | /* | |
119 | * sort out different calling conventions | |
120 | */ | |
121 | .align | |
26e5ca93 | 122 | .arm @ Always enter in ARM state |
1da177e4 LT |
123 | start: |
124 | .type start,#function | |
b11fe388 | 125 | .rept 7 |
1da177e4 LT |
126 | mov r0, r0 |
127 | .endr | |
b11fe388 NP |
128 | ARM( mov r0, r0 ) |
129 | ARM( b 1f ) | |
130 | THUMB( adr r12, BSYM(1f) ) | |
131 | THUMB( bx r12 ) | |
1da177e4 | 132 | |
1da177e4 LT |
133 | .word 0x016f2818 @ Magic numbers to help the loader |
134 | .word start @ absolute load/run zImage address | |
135 | .word _edata @ zImage end address | |
26e5ca93 | 136 | THUMB( .thumb ) |
424e5994 DM |
137 | 1: |
138 | mrs r9, cpsr | |
139 | #ifdef CONFIG_ARM_VIRT_EXT | |
140 | bl __hyp_stub_install @ get into SVC mode, reversibly | |
141 | #endif | |
142 | mov r7, r1 @ save architecture ID | |
f4619025 | 143 | mov r8, r2 @ save atags pointer |
1da177e4 LT |
144 | |
145 | #ifndef __ARM_ARCH_2__ | |
146 | /* | |
147 | * Booting from Angel - need to enter SVC mode and disable | |
148 | * FIQs/IRQs (numeric definitions from angel arm.h source). | |
149 | * We only do this if we were in user mode on entry. | |
150 | */ | |
151 | mrs r2, cpsr @ get current mode | |
152 | tst r2, #3 @ not user? | |
153 | bne not_angel | |
154 | mov r0, #0x17 @ angel_SWIreason_EnterSVC | |
0e056f20 CM |
155 | ARM( swi 0x123456 ) @ angel_SWI_ARM |
156 | THUMB( svc 0xab ) @ angel_SWI_THUMB | |
1da177e4 | 157 | not_angel: |
424e5994 DM |
158 | safe_svcmode_maskall r0 |
159 | msr spsr_cxsf, r9 @ Save the CPU boot mode in | |
160 | @ SPSR | |
1da177e4 LT |
161 | #else |
162 | teqp pc, #0x0c000003 @ turn off interrupts | |
163 | #endif | |
164 | ||
165 | /* | |
166 | * Note that some cache flushing and other stuff may | |
167 | * be needed here - is there an Angel SWI call for this? | |
168 | */ | |
169 | ||
170 | /* | |
171 | * some architecture specific code can be inserted | |
f4619025 | 172 | * by the linker here, but it should preserve r7, r8, and r9. |
1da177e4 LT |
173 | */ |
174 | ||
175 | .text | |
6d7d0ae5 | 176 | |
e69edc79 EM |
177 | #ifdef CONFIG_AUTO_ZRELADDR |
178 | @ determine final kernel image address | |
bfa64c4a DM |
179 | mov r4, pc |
180 | and r4, r4, #0xf8000000 | |
e69edc79 EM |
181 | add r4, r4, #TEXT_OFFSET |
182 | #else | |
9e84ed63 | 183 | ldr r4, =zreladdr |
e69edc79 | 184 | #endif |
1da177e4 | 185 | |
6d7d0ae5 NP |
186 | bl cache_on |
187 | ||
188 | restart: adr r0, LC0 | |
34cc1a8f | 189 | ldmia r0, {r1, r2, r3, r6, r10, r11, r12} |
adcc2591 | 190 | ldr sp, [r0, #28] |
6d7d0ae5 NP |
191 | |
192 | /* | |
193 | * We might be running at a different address. We need | |
194 | * to fix up various pointers. | |
195 | */ | |
196 | sub r0, r0, r1 @ calculate the delta offset | |
6d7d0ae5 | 197 | add r6, r6, r0 @ _edata |
34cc1a8f NP |
198 | add r10, r10, r0 @ inflated kernel size location |
199 | ||
200 | /* | |
201 | * The kernel build system appends the size of the | |
202 | * decompressed kernel at the end of the compressed data | |
203 | * in little-endian form. | |
204 | */ | |
205 | ldrb r9, [r10, #0] | |
206 | ldrb lr, [r10, #1] | |
207 | orr r9, r9, lr, lsl #8 | |
208 | ldrb lr, [r10, #2] | |
209 | ldrb r10, [r10, #3] | |
210 | orr r9, r9, lr, lsl #16 | |
211 | orr r9, r9, r10, lsl #24 | |
1da177e4 | 212 | |
6d7d0ae5 NP |
213 | #ifndef CONFIG_ZBOOT_ROM |
214 | /* malloc space is above the relocated stack (64k max) */ | |
215 | add sp, sp, r0 | |
216 | add r10, sp, #0x10000 | |
217 | #else | |
1da177e4 | 218 | /* |
6d7d0ae5 NP |
219 | * With ZBOOT_ROM the bss/stack is non relocatable, |
220 | * but someone could still run this code from RAM, | |
221 | * in which case our reference is _edata. | |
1da177e4 | 222 | */ |
6d7d0ae5 NP |
223 | mov r10, r6 |
224 | #endif | |
225 | ||
e2a6a3aa JB |
226 | mov r5, #0 @ init dtb size to 0 |
227 | #ifdef CONFIG_ARM_APPENDED_DTB | |
228 | /* | |
229 | * r0 = delta | |
230 | * r2 = BSS start | |
231 | * r3 = BSS end | |
232 | * r4 = final kernel address | |
233 | * r5 = appended dtb size (still unknown) | |
234 | * r6 = _edata | |
235 | * r7 = architecture ID | |
236 | * r8 = atags/device tree pointer | |
237 | * r9 = size of decompressed image | |
238 | * r10 = end of this image, including bss/stack/malloc space if non XIP | |
239 | * r11 = GOT start | |
240 | * r12 = GOT end | |
241 | * sp = stack pointer | |
242 | * | |
243 | * if there are device trees (dtb) appended to zImage, advance r10 so that the | |
244 | * dtb data will get relocated along with the kernel if necessary. | |
245 | */ | |
246 | ||
247 | ldr lr, [r6, #0] | |
248 | #ifndef __ARMEB__ | |
249 | ldr r1, =0xedfe0dd0 @ sig is 0xd00dfeed big endian | |
250 | #else | |
251 | ldr r1, =0xd00dfeed | |
252 | #endif | |
253 | cmp lr, r1 | |
254 | bne dtb_check_done @ not found | |
255 | ||
b90b9a38 NP |
256 | #ifdef CONFIG_ARM_ATAG_DTB_COMPAT |
257 | /* | |
258 | * OK... Let's do some funky business here. | |
259 | * If we do have a DTB appended to zImage, and we do have | |
260 | * an ATAG list around, we want the later to be translated | |
261 | * and folded into the former here. To be on the safe side, | |
262 | * let's temporarily move the stack away into the malloc | |
263 | * area. No GOT fixup has occurred yet, but none of the | |
264 | * code we're about to call uses any global variable. | |
265 | */ | |
266 | add sp, sp, #0x10000 | |
267 | stmfd sp!, {r0-r3, ip, lr} | |
268 | mov r0, r8 | |
269 | mov r1, r6 | |
270 | sub r2, sp, r6 | |
271 | bl atags_to_fdt | |
272 | ||
273 | /* | |
274 | * If returned value is 1, there is no ATAG at the location | |
275 | * pointed by r8. Try the typical 0x100 offset from start | |
276 | * of RAM and hope for the best. | |
277 | */ | |
278 | cmp r0, #1 | |
531a6a94 NP |
279 | sub r0, r4, #TEXT_OFFSET |
280 | add r0, r0, #0x100 | |
b90b9a38 NP |
281 | mov r1, r6 |
282 | sub r2, sp, r6 | |
9c5fd9e8 | 283 | bleq atags_to_fdt |
b90b9a38 NP |
284 | |
285 | ldmfd sp!, {r0-r3, ip, lr} | |
286 | sub sp, sp, #0x10000 | |
287 | #endif | |
288 | ||
e2a6a3aa JB |
289 | mov r8, r6 @ use the appended device tree |
290 | ||
5ffb04f6 NP |
291 | /* |
292 | * Make sure that the DTB doesn't end up in the final | |
293 | * kernel's .bss area. To do so, we adjust the decompressed | |
294 | * kernel size to compensate if that .bss size is larger | |
295 | * than the relocated code. | |
296 | */ | |
297 | ldr r5, =_kernel_bss_size | |
298 | adr r1, wont_overwrite | |
299 | sub r1, r6, r1 | |
300 | subs r1, r5, r1 | |
301 | addhi r9, r9, r1 | |
302 | ||
e2a6a3aa JB |
303 | /* Get the dtb's size */ |
304 | ldr r5, [r6, #4] | |
305 | #ifndef __ARMEB__ | |
306 | /* convert r5 (dtb size) to little endian */ | |
307 | eor r1, r5, r5, ror #16 | |
308 | bic r1, r1, #0x00ff0000 | |
309 | mov r5, r5, ror #8 | |
310 | eor r5, r5, r1, lsr #8 | |
311 | #endif | |
312 | ||
313 | /* preserve 64-bit alignment */ | |
314 | add r5, r5, #7 | |
315 | bic r5, r5, #7 | |
316 | ||
317 | /* relocate some pointers past the appended dtb */ | |
318 | add r6, r6, r5 | |
319 | add r10, r10, r5 | |
320 | add sp, sp, r5 | |
321 | dtb_check_done: | |
322 | #endif | |
323 | ||
6d7d0ae5 NP |
324 | /* |
325 | * Check to see if we will overwrite ourselves. | |
326 | * r4 = final kernel address | |
6d7d0ae5 NP |
327 | * r9 = size of decompressed image |
328 | * r10 = end of this image, including bss/stack/malloc space if non XIP | |
329 | * We basically want: | |
ea9df3b1 | 330 | * r4 - 16k page directory >= r10 -> OK |
5ffb04f6 | 331 | * r4 + image length <= address of wont_overwrite -> OK |
6d7d0ae5 | 332 | */ |
ea9df3b1 | 333 | add r10, r10, #16384 |
6d7d0ae5 NP |
334 | cmp r4, r10 |
335 | bhs wont_overwrite | |
336 | add r10, r4, r9 | |
5ffb04f6 NP |
337 | adr r9, wont_overwrite |
338 | cmp r10, r9 | |
6d7d0ae5 NP |
339 | bls wont_overwrite |
340 | ||
341 | /* | |
342 | * Relocate ourselves past the end of the decompressed kernel. | |
6d7d0ae5 NP |
343 | * r6 = _edata |
344 | * r10 = end of the decompressed kernel | |
345 | * Because we always copy ahead, we need to do it from the end and go | |
346 | * backward in case the source and destination overlap. | |
347 | */ | |
adcc2591 NP |
348 | /* |
349 | * Bump to the next 256-byte boundary with the size of | |
350 | * the relocation code added. This avoids overwriting | |
351 | * ourself when the offset is small. | |
352 | */ | |
353 | add r10, r10, #((reloc_code_end - restart + 256) & ~255) | |
6d7d0ae5 NP |
354 | bic r10, r10, #255 |
355 | ||
adcc2591 NP |
356 | /* Get start of code we want to copy and align it down. */ |
357 | adr r5, restart | |
358 | bic r5, r5, #31 | |
359 | ||
424e5994 DM |
360 | /* Relocate the hyp vector base if necessary */ |
361 | #ifdef CONFIG_ARM_VIRT_EXT | |
362 | mrs r0, spsr | |
363 | and r0, r0, #MODE_MASK | |
364 | cmp r0, #HYP_MODE | |
365 | bne 1f | |
366 | ||
367 | bl __hyp_get_vectors | |
368 | sub r0, r0, r5 | |
369 | add r0, r0, r10 | |
370 | bl __hyp_set_vectors | |
371 | 1: | |
372 | #endif | |
373 | ||
6d7d0ae5 NP |
374 | sub r9, r6, r5 @ size to copy |
375 | add r9, r9, #31 @ rounded up to a multiple | |
376 | bic r9, r9, #31 @ ... of 32 bytes | |
377 | add r6, r9, r5 | |
378 | add r9, r9, r10 | |
379 | ||
380 | 1: ldmdb r6!, {r0 - r3, r10 - r12, lr} | |
381 | cmp r6, r5 | |
382 | stmdb r9!, {r0 - r3, r10 - r12, lr} | |
383 | bhi 1b | |
384 | ||
385 | /* Preserve offset to relocated code. */ | |
386 | sub r6, r9, r6 | |
387 | ||
7c2527f0 TL |
388 | #ifndef CONFIG_ZBOOT_ROM |
389 | /* cache_clean_flush may use the stack, so relocate it */ | |
390 | add sp, sp, r6 | |
391 | #endif | |
392 | ||
6d7d0ae5 NP |
393 | bl cache_clean_flush |
394 | ||
395 | adr r0, BSYM(restart) | |
396 | add r0, r0, r6 | |
397 | mov pc, r0 | |
398 | ||
399 | wont_overwrite: | |
400 | /* | |
401 | * If delta is zero, we are running at the address we were linked at. | |
402 | * r0 = delta | |
403 | * r2 = BSS start | |
404 | * r3 = BSS end | |
405 | * r4 = kernel execution address | |
e2a6a3aa | 406 | * r5 = appended dtb size (0 if not present) |
6d7d0ae5 NP |
407 | * r7 = architecture ID |
408 | * r8 = atags pointer | |
409 | * r11 = GOT start | |
410 | * r12 = GOT end | |
411 | * sp = stack pointer | |
412 | */ | |
e2a6a3aa | 413 | orrs r1, r0, r5 |
6d7d0ae5 | 414 | beq not_relocated |
e2a6a3aa | 415 | |
98e12b5a | 416 | add r11, r11, r0 |
6d7d0ae5 | 417 | add r12, r12, r0 |
1da177e4 LT |
418 | |
419 | #ifndef CONFIG_ZBOOT_ROM | |
420 | /* | |
421 | * If we're running fully PIC === CONFIG_ZBOOT_ROM = n, | |
422 | * we need to fix up pointers into the BSS region. | |
6d7d0ae5 | 423 | * Note that the stack pointer has already been fixed up. |
1da177e4 LT |
424 | */ |
425 | add r2, r2, r0 | |
426 | add r3, r3, r0 | |
1da177e4 LT |
427 | |
428 | /* | |
429 | * Relocate all entries in the GOT table. | |
e2a6a3aa | 430 | * Bump bss entries to _edata + dtb size |
1da177e4 | 431 | */ |
98e12b5a | 432 | 1: ldr r1, [r11, #0] @ relocate entries in the GOT |
e2a6a3aa JB |
433 | add r1, r1, r0 @ This fixes up C references |
434 | cmp r1, r2 @ if entry >= bss_start && | |
435 | cmphs r3, r1 @ bss_end > entry | |
436 | addhi r1, r1, r5 @ entry += dtb size | |
437 | str r1, [r11], #4 @ next entry | |
6d7d0ae5 | 438 | cmp r11, r12 |
1da177e4 | 439 | blo 1b |
e2a6a3aa JB |
440 | |
441 | /* bump our bss pointers too */ | |
442 | add r2, r2, r5 | |
443 | add r3, r3, r5 | |
444 | ||
1da177e4 LT |
445 | #else |
446 | ||
447 | /* | |
448 | * Relocate entries in the GOT table. We only relocate | |
449 | * the entries that are outside the (relocated) BSS region. | |
450 | */ | |
98e12b5a | 451 | 1: ldr r1, [r11, #0] @ relocate entries in the GOT |
1da177e4 LT |
452 | cmp r1, r2 @ entry < bss_start || |
453 | cmphs r3, r1 @ _end < entry | |
454 | addlo r1, r1, r0 @ table. This fixes up the | |
98e12b5a | 455 | str r1, [r11], #4 @ C references. |
6d7d0ae5 | 456 | cmp r11, r12 |
1da177e4 LT |
457 | blo 1b |
458 | #endif | |
459 | ||
460 | not_relocated: mov r0, #0 | |
461 | 1: str r0, [r2], #4 @ clear bss | |
462 | str r0, [r2], #4 | |
463 | str r0, [r2], #4 | |
464 | str r0, [r2], #4 | |
465 | cmp r2, r3 | |
466 | blo 1b | |
467 | ||
1da177e4 | 468 | /* |
6d7d0ae5 NP |
469 | * The C runtime environment should now be setup sufficiently. |
470 | * Set up some pointers, and start decompressing. | |
471 | * r4 = kernel execution address | |
472 | * r7 = architecture ID | |
473 | * r8 = atags pointer | |
1da177e4 | 474 | */ |
6d7d0ae5 NP |
475 | mov r0, r4 |
476 | mov r1, sp @ malloc space above stack | |
477 | add r2, sp, #0x10000 @ 64k max | |
1da177e4 LT |
478 | mov r3, r7 |
479 | bl decompress_kernel | |
1da177e4 | 480 | bl cache_clean_flush |
6d7d0ae5 | 481 | bl cache_off |
6d7d0ae5 NP |
482 | mov r1, r7 @ restore architecture number |
483 | mov r2, r8 @ restore atags pointer | |
424e5994 DM |
484 | |
485 | #ifdef CONFIG_ARM_VIRT_EXT | |
486 | mrs r0, spsr @ Get saved CPU boot mode | |
487 | and r0, r0, #MODE_MASK | |
488 | cmp r0, #HYP_MODE @ if not booted in HYP mode... | |
489 | bne __enter_kernel @ boot kernel directly | |
490 | ||
491 | adr r12, .L__hyp_reentry_vectors_offset | |
492 | ldr r0, [r12] | |
493 | add r0, r0, r12 | |
494 | ||
495 | bl __hyp_set_vectors | |
496 | __HVC(0) @ otherwise bounce to hyp mode | |
497 | ||
498 | b . @ should never be reached | |
499 | ||
500 | .align 2 | |
501 | .L__hyp_reentry_vectors_offset: .long __hyp_reentry_vectors - . | |
502 | #else | |
503 | b __enter_kernel | |
504 | #endif | |
1da177e4 | 505 | |
88987ef9 | 506 | .align 2 |
1da177e4 LT |
507 | .type LC0, #object |
508 | LC0: .word LC0 @ r1 | |
509 | .word __bss_start @ r2 | |
510 | .word _end @ r3 | |
6d7d0ae5 | 511 | .word _edata @ r6 |
34cc1a8f | 512 | .word input_data_end - 4 @ r10 (inflated size location) |
98e12b5a | 513 | .word _got_start @ r11 |
1da177e4 | 514 | .word _got_end @ ip |
8d7e4cc2 | 515 | .word .L_user_stack_end @ sp |
1da177e4 LT |
516 | .size LC0, . - LC0 |
517 | ||
518 | #ifdef CONFIG_ARCH_RPC | |
519 | .globl params | |
db7b2b4b | 520 | params: ldr r0, =0x10000100 @ params_phys for RPC |
1da177e4 LT |
521 | mov pc, lr |
522 | .ltorg | |
523 | .align | |
524 | #endif | |
525 | ||
526 | /* | |
527 | * Turn on the cache. We need to setup some page tables so that we | |
528 | * can have both the I and D caches on. | |
529 | * | |
530 | * We place the page tables 16k down from the kernel execution address, | |
531 | * and we hope that nothing else is using it. If we're using it, we | |
532 | * will go pop! | |
533 | * | |
534 | * On entry, | |
535 | * r4 = kernel execution address | |
1da177e4 | 536 | * r7 = architecture number |
f4619025 | 537 | * r8 = atags pointer |
1da177e4 | 538 | * On exit, |
21b2841d | 539 | * r0, r1, r2, r3, r9, r10, r12 corrupted |
1da177e4 | 540 | * This routine must preserve: |
6d7d0ae5 | 541 | * r4, r7, r8 |
1da177e4 LT |
542 | */ |
543 | .align 5 | |
544 | cache_on: mov r3, #8 @ cache_on function | |
545 | b call_cache_fn | |
546 | ||
10c2df65 HC |
547 | /* |
548 | * Initialize the highest priority protection region, PR7 | |
549 | * to cover all 32bit address and cacheable and bufferable. | |
550 | */ | |
551 | __armv4_mpu_cache_on: | |
552 | mov r0, #0x3f @ 4G, the whole | |
553 | mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting | |
554 | mcr p15, 0, r0, c6, c7, 1 | |
555 | ||
556 | mov r0, #0x80 @ PR7 | |
557 | mcr p15, 0, r0, c2, c0, 0 @ D-cache on | |
558 | mcr p15, 0, r0, c2, c0, 1 @ I-cache on | |
559 | mcr p15, 0, r0, c3, c0, 0 @ write-buffer on | |
560 | ||
561 | mov r0, #0xc000 | |
562 | mcr p15, 0, r0, c5, c0, 1 @ I-access permission | |
563 | mcr p15, 0, r0, c5, c0, 0 @ D-access permission | |
564 | ||
565 | mov r0, #0 | |
566 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer | |
567 | mcr p15, 0, r0, c7, c5, 0 @ flush(inval) I-Cache | |
568 | mcr p15, 0, r0, c7, c6, 0 @ flush(inval) D-Cache | |
569 | mrc p15, 0, r0, c1, c0, 0 @ read control reg | |
570 | @ ...I .... ..D. WC.M | |
571 | orr r0, r0, #0x002d @ .... .... ..1. 11.1 | |
572 | orr r0, r0, #0x1000 @ ...1 .... .... .... | |
573 | ||
574 | mcr p15, 0, r0, c1, c0, 0 @ write control reg | |
575 | ||
576 | mov r0, #0 | |
577 | mcr p15, 0, r0, c7, c5, 0 @ flush(inval) I-Cache | |
578 | mcr p15, 0, r0, c7, c6, 0 @ flush(inval) D-Cache | |
579 | mov pc, lr | |
580 | ||
581 | __armv3_mpu_cache_on: | |
582 | mov r0, #0x3f @ 4G, the whole | |
583 | mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting | |
584 | ||
585 | mov r0, #0x80 @ PR7 | |
586 | mcr p15, 0, r0, c2, c0, 0 @ cache on | |
587 | mcr p15, 0, r0, c3, c0, 0 @ write-buffer on | |
588 | ||
589 | mov r0, #0xc000 | |
590 | mcr p15, 0, r0, c5, c0, 0 @ access permission | |
591 | ||
592 | mov r0, #0 | |
593 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 | |
4a8d57a5 UKK |
594 | /* |
595 | * ?? ARMv3 MMU does not allow reading the control register, | |
596 | * does this really work on ARMv3 MPU? | |
597 | */ | |
10c2df65 HC |
598 | mrc p15, 0, r0, c1, c0, 0 @ read control reg |
599 | @ .... .... .... WC.M | |
600 | orr r0, r0, #0x000d @ .... .... .... 11.1 | |
4a8d57a5 | 601 | /* ?? this overwrites the value constructed above? */ |
10c2df65 HC |
602 | mov r0, #0 |
603 | mcr p15, 0, r0, c1, c0, 0 @ write control reg | |
604 | ||
4a8d57a5 | 605 | /* ?? invalidate for the second time? */ |
10c2df65 HC |
606 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 |
607 | mov pc, lr | |
608 | ||
1fdc08ab RK |
609 | #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH |
610 | #define CB_BITS 0x08 | |
611 | #else | |
612 | #define CB_BITS 0x0c | |
613 | #endif | |
614 | ||
1da177e4 LT |
615 | __setup_mmu: sub r3, r4, #16384 @ Page directory size |
616 | bic r3, r3, #0xff @ Align the pointer | |
617 | bic r3, r3, #0x3f00 | |
618 | /* | |
619 | * Initialise the page tables, turning on the cacheable and bufferable | |
620 | * bits for the RAM area only. | |
621 | */ | |
622 | mov r0, r3 | |
f4619025 RK |
623 | mov r9, r0, lsr #18 |
624 | mov r9, r9, lsl #18 @ start of RAM | |
625 | add r10, r9, #0x10000000 @ a reasonable RAM size | |
1fdc08ab RK |
626 | mov r1, #0x12 @ XN|U + section mapping |
627 | orr r1, r1, #3 << 10 @ AP=11 | |
1da177e4 | 628 | add r2, r3, #16384 |
265d5e48 | 629 | 1: cmp r1, r9 @ if virt > start of RAM |
1fdc08ab RK |
630 | cmphs r10, r1 @ && end of RAM > virt |
631 | bic r1, r1, #0x1c @ clear XN|U + C + B | |
632 | orrlo r1, r1, #0x10 @ Set XN|U for non-RAM | |
633 | orrhs r1, r1, r6 @ set RAM section settings | |
1da177e4 LT |
634 | str r1, [r0], #4 @ 1:1 mapping |
635 | add r1, r1, #1048576 | |
636 | teq r0, r2 | |
637 | bne 1b | |
638 | /* | |
639 | * If ever we are running from Flash, then we surely want the cache | |
640 | * to be enabled also for our execution instance... We map 2MB of it | |
641 | * so there is no map overlap problem for up to 1 MB compressed kernel. | |
642 | * If the execution is in RAM then we would only be duplicating the above. | |
643 | */ | |
1fdc08ab | 644 | orr r1, r6, #0x04 @ ensure B is set for this |
1da177e4 | 645 | orr r1, r1, #3 << 10 |
bfa64c4a DM |
646 | mov r2, pc |
647 | mov r2, r2, lsr #20 | |
1da177e4 LT |
648 | orr r1, r1, r2, lsl #20 |
649 | add r0, r3, r2, lsl #2 | |
650 | str r1, [r0], #4 | |
651 | add r1, r1, #1048576 | |
652 | str r1, [r0] | |
653 | mov pc, lr | |
93ed3970 | 654 | ENDPROC(__setup_mmu) |
1da177e4 | 655 | |
5010192d DM |
656 | @ Enable unaligned access on v6, to allow better code generation |
657 | @ for the decompressor C code: | |
658 | __armv6_mmu_cache_on: | |
659 | mrc p15, 0, r0, c1, c0, 0 @ read SCTLR | |
660 | bic r0, r0, #2 @ A (no unaligned access fault) | |
661 | orr r0, r0, #1 << 22 @ U (v6 unaligned access model) | |
662 | mcr p15, 0, r0, c1, c0, 0 @ write SCTLR | |
663 | b __armv4_mmu_cache_on | |
664 | ||
af3e4fd3 MG |
665 | __arm926ejs_mmu_cache_on: |
666 | #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH | |
667 | mov r0, #4 @ put dcache in WT mode | |
668 | mcr p15, 7, r0, c15, c0, 0 | |
669 | #endif | |
670 | ||
c76b6b41 | 671 | __armv4_mmu_cache_on: |
1da177e4 | 672 | mov r12, lr |
8bdca0ac | 673 | #ifdef CONFIG_MMU |
1fdc08ab | 674 | mov r6, #CB_BITS | 0x12 @ U |
1da177e4 LT |
675 | bl __setup_mmu |
676 | mov r0, #0 | |
677 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer | |
678 | mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs | |
679 | mrc p15, 0, r0, c1, c0, 0 @ read control reg | |
680 | orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement | |
681 | orr r0, r0, #0x0030 | |
26584853 CM |
682 | #ifdef CONFIG_CPU_ENDIAN_BE8 |
683 | orr r0, r0, #1 << 25 @ big-endian page tables | |
684 | #endif | |
c76b6b41 | 685 | bl __common_mmu_cache_on |
1da177e4 LT |
686 | mov r0, #0 |
687 | mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs | |
8bdca0ac | 688 | #endif |
1da177e4 LT |
689 | mov pc, r12 |
690 | ||
7d09e854 CM |
691 | __armv7_mmu_cache_on: |
692 | mov r12, lr | |
8bdca0ac | 693 | #ifdef CONFIG_MMU |
7d09e854 CM |
694 | mrc p15, 0, r11, c0, c1, 4 @ read ID_MMFR0 |
695 | tst r11, #0xf @ VMSA | |
1fdc08ab | 696 | movne r6, #CB_BITS | 0x02 @ !XN |
7d09e854 CM |
697 | blne __setup_mmu |
698 | mov r0, #0 | |
699 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer | |
700 | tst r11, #0xf @ VMSA | |
701 | mcrne p15, 0, r0, c8, c7, 0 @ flush I,D TLBs | |
8bdca0ac | 702 | #endif |
7d09e854 | 703 | mrc p15, 0, r0, c1, c0, 0 @ read control reg |
e1e5b7e4 | 704 | bic r0, r0, #1 << 28 @ clear SCTLR.TRE |
7d09e854 CM |
705 | orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement |
706 | orr r0, r0, #0x003c @ write buffer | |
5010192d DM |
707 | bic r0, r0, #2 @ A (no unaligned access fault) |
708 | orr r0, r0, #1 << 22 @ U (v6 unaligned access model) | |
709 | @ (needed for ARM1176) | |
8bdca0ac | 710 | #ifdef CONFIG_MMU |
26584853 CM |
711 | #ifdef CONFIG_CPU_ENDIAN_BE8 |
712 | orr r0, r0, #1 << 25 @ big-endian page tables | |
713 | #endif | |
dbece458 | 714 | mrcne p15, 0, r6, c2, c0, 2 @ read ttb control reg |
7d09e854 | 715 | orrne r0, r0, #1 @ MMU enabled |
1fdc08ab | 716 | movne r1, #0xfffffffd @ domain 0 = client |
dbece458 WD |
717 | bic r6, r6, #1 << 31 @ 32-bit translation system |
718 | bic r6, r6, #3 << 0 @ use only ttbr0 | |
7d09e854 | 719 | mcrne p15, 0, r3, c2, c0, 0 @ load page table pointer |
6fa3eb70 S |
720 | mcrne p15, 0, r0, c8, c7, 0 @ flush I,D TLBs |
721 | mcr p15, 0, r0, c7, c5, 4 @ ISB | |
7d09e854 | 722 | mcrne p15, 0, r1, c3, c0, 0 @ load domain access control |
dbece458 | 723 | mcrne p15, 0, r6, c2, c0, 2 @ load ttb control |
8bdca0ac | 724 | #endif |
d675d0bc | 725 | mcr p15, 0, r0, c7, c5, 4 @ ISB |
7d09e854 CM |
726 | mcr p15, 0, r0, c1, c0, 0 @ load control register |
727 | mrc p15, 0, r0, c1, c0, 0 @ and read it back | |
728 | mov r0, #0 | |
729 | mcr p15, 0, r0, c7, c5, 4 @ ISB | |
730 | mov pc, r12 | |
731 | ||
28853ac8 PZ |
732 | __fa526_cache_on: |
733 | mov r12, lr | |
1fdc08ab | 734 | mov r6, #CB_BITS | 0x12 @ U |
28853ac8 PZ |
735 | bl __setup_mmu |
736 | mov r0, #0 | |
737 | mcr p15, 0, r0, c7, c7, 0 @ Invalidate whole cache | |
738 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer | |
739 | mcr p15, 0, r0, c8, c7, 0 @ flush UTLB | |
740 | mrc p15, 0, r0, c1, c0, 0 @ read control reg | |
741 | orr r0, r0, #0x1000 @ I-cache enable | |
742 | bl __common_mmu_cache_on | |
743 | mov r0, #0 | |
744 | mcr p15, 0, r0, c8, c7, 0 @ flush UTLB | |
745 | mov pc, r12 | |
746 | ||
c76b6b41 | 747 | __common_mmu_cache_on: |
0e056f20 | 748 | #ifndef CONFIG_THUMB2_KERNEL |
1da177e4 LT |
749 | #ifndef DEBUG |
750 | orr r0, r0, #0x000d @ Write buffer, mmu | |
751 | #endif | |
752 | mov r1, #-1 | |
753 | mcr p15, 0, r3, c2, c0, 0 @ load page table pointer | |
754 | mcr p15, 0, r1, c3, c0, 0 @ load domain access control | |
2dc7667b NP |
755 | b 1f |
756 | .align 5 @ cache line aligned | |
757 | 1: mcr p15, 0, r0, c1, c0, 0 @ load control register | |
758 | mrc p15, 0, r0, c1, c0, 0 @ and read it back to | |
759 | sub pc, lr, r0, lsr #32 @ properly flush pipeline | |
0e056f20 | 760 | #endif |
1da177e4 | 761 | |
946a105e DM |
762 | #define PROC_ENTRY_SIZE (4*5) |
763 | ||
1da177e4 LT |
764 | /* |
765 | * Here follow the relocatable cache support functions for the | |
766 | * various processors. This is a generic hook for locating an | |
767 | * entry and jumping to an instruction at the specified offset | |
768 | * from the start of the block. Please note this is all position | |
769 | * independent code. | |
770 | * | |
771 | * r1 = corrupted | |
772 | * r2 = corrupted | |
773 | * r3 = block offset | |
98e12b5a | 774 | * r9 = corrupted |
1da177e4 LT |
775 | * r12 = corrupted |
776 | */ | |
777 | ||
778 | call_cache_fn: adr r12, proc_types | |
f12d0d7c | 779 | #ifdef CONFIG_CPU_CP15 |
98e12b5a | 780 | mrc p15, 0, r9, c0, c0 @ get processor ID |
f12d0d7c | 781 | #else |
98e12b5a | 782 | ldr r9, =CONFIG_PROCESSOR_ID |
f12d0d7c | 783 | #endif |
1da177e4 LT |
784 | 1: ldr r1, [r12, #0] @ get value |
785 | ldr r2, [r12, #4] @ get mask | |
98e12b5a | 786 | eor r1, r1, r9 @ (real ^ match) |
1da177e4 | 787 | tst r1, r2 @ & mask |
0e056f20 CM |
788 | ARM( addeq pc, r12, r3 ) @ call cache function |
789 | THUMB( addeq r12, r3 ) | |
790 | THUMB( moveq pc, r12 ) @ call cache function | |
946a105e | 791 | add r12, r12, #PROC_ENTRY_SIZE |
1da177e4 LT |
792 | b 1b |
793 | ||
794 | /* | |
795 | * Table for cache operations. This is basically: | |
796 | * - CPU ID match | |
797 | * - CPU ID mask | |
798 | * - 'cache on' method instruction | |
799 | * - 'cache off' method instruction | |
800 | * - 'cache flush' method instruction | |
801 | * | |
802 | * We match an entry using: ((real_id ^ match) & mask) == 0 | |
803 | * | |
804 | * Writethrough caches generally only need 'on' and 'off' | |
805 | * methods. Writeback caches _must_ have the flush method | |
806 | * defined. | |
807 | */ | |
88987ef9 | 808 | .align 2 |
1da177e4 LT |
809 | .type proc_types,#object |
810 | proc_types: | |
ced2a3b8 M |
811 | .word 0x41000000 @ old ARM ID |
812 | .word 0xff00f000 | |
1da177e4 | 813 | mov pc, lr |
0e056f20 | 814 | THUMB( nop ) |
1da177e4 | 815 | mov pc, lr |
0e056f20 | 816 | THUMB( nop ) |
1da177e4 | 817 | mov pc, lr |
0e056f20 | 818 | THUMB( nop ) |
1da177e4 LT |
819 | |
820 | .word 0x41007000 @ ARM7/710 | |
821 | .word 0xfff8fe00 | |
4cdfc2ec RK |
822 | mov pc, lr |
823 | THUMB( nop ) | |
824 | mov pc, lr | |
825 | THUMB( nop ) | |
1da177e4 | 826 | mov pc, lr |
0e056f20 | 827 | THUMB( nop ) |
1da177e4 LT |
828 | |
829 | .word 0x41807200 @ ARM720T (writethrough) | |
830 | .word 0xffffff00 | |
0e056f20 CM |
831 | W(b) __armv4_mmu_cache_on |
832 | W(b) __armv4_mmu_cache_off | |
1da177e4 | 833 | mov pc, lr |
0e056f20 | 834 | THUMB( nop ) |
1da177e4 | 835 | |
10c2df65 HC |
836 | .word 0x41007400 @ ARM74x |
837 | .word 0xff00ff00 | |
0e056f20 CM |
838 | W(b) __armv3_mpu_cache_on |
839 | W(b) __armv3_mpu_cache_off | |
840 | W(b) __armv3_mpu_cache_flush | |
10c2df65 HC |
841 | |
842 | .word 0x41009400 @ ARM94x | |
843 | .word 0xff00ff00 | |
0e056f20 CM |
844 | W(b) __armv4_mpu_cache_on |
845 | W(b) __armv4_mpu_cache_off | |
846 | W(b) __armv4_mpu_cache_flush | |
10c2df65 | 847 | |
af3e4fd3 MG |
848 | .word 0x41069260 @ ARM926EJ-S (v5TEJ) |
849 | .word 0xff0ffff0 | |
720c60e1 NP |
850 | W(b) __arm926ejs_mmu_cache_on |
851 | W(b) __armv4_mmu_cache_off | |
852 | W(b) __armv5tej_mmu_cache_flush | |
10c2df65 | 853 | |
1da177e4 LT |
854 | .word 0x00007000 @ ARM7 IDs |
855 | .word 0x0000f000 | |
856 | mov pc, lr | |
0e056f20 | 857 | THUMB( nop ) |
1da177e4 | 858 | mov pc, lr |
0e056f20 | 859 | THUMB( nop ) |
1da177e4 | 860 | mov pc, lr |
0e056f20 | 861 | THUMB( nop ) |
1da177e4 LT |
862 | |
863 | @ Everything from here on will be the new ID system. | |
864 | ||
865 | .word 0x4401a100 @ sa110 / sa1100 | |
866 | .word 0xffffffe0 | |
0e056f20 CM |
867 | W(b) __armv4_mmu_cache_on |
868 | W(b) __armv4_mmu_cache_off | |
869 | W(b) __armv4_mmu_cache_flush | |
1da177e4 LT |
870 | |
871 | .word 0x6901b110 @ sa1110 | |
872 | .word 0xfffffff0 | |
0e056f20 CM |
873 | W(b) __armv4_mmu_cache_on |
874 | W(b) __armv4_mmu_cache_off | |
875 | W(b) __armv4_mmu_cache_flush | |
1da177e4 | 876 | |
4157d317 HZ |
877 | .word 0x56056900 |
878 | .word 0xffffff00 @ PXA9xx | |
0e056f20 CM |
879 | W(b) __armv4_mmu_cache_on |
880 | W(b) __armv4_mmu_cache_off | |
881 | W(b) __armv4_mmu_cache_flush | |
49cbe786 EM |
882 | |
883 | .word 0x56158000 @ PXA168 | |
884 | .word 0xfffff000 | |
0e056f20 CM |
885 | W(b) __armv4_mmu_cache_on |
886 | W(b) __armv4_mmu_cache_off | |
887 | W(b) __armv5tej_mmu_cache_flush | |
49cbe786 | 888 | |
2e2023fe NP |
889 | .word 0x56050000 @ Feroceon |
890 | .word 0xff0f0000 | |
0e056f20 CM |
891 | W(b) __armv4_mmu_cache_on |
892 | W(b) __armv4_mmu_cache_off | |
893 | W(b) __armv5tej_mmu_cache_flush | |
3ebb5a2b | 894 | |
5587931c JS |
895 | #ifdef CONFIG_CPU_FEROCEON_OLD_ID |
896 | /* this conflicts with the standard ARMv5TE entry */ | |
897 | .long 0x41009260 @ Old Feroceon | |
898 | .long 0xff00fff0 | |
899 | b __armv4_mmu_cache_on | |
900 | b __armv4_mmu_cache_off | |
901 | b __armv5tej_mmu_cache_flush | |
902 | #endif | |
903 | ||
28853ac8 PZ |
904 | .word 0x66015261 @ FA526 |
905 | .word 0xff01fff1 | |
0e056f20 CM |
906 | W(b) __fa526_cache_on |
907 | W(b) __armv4_mmu_cache_off | |
908 | W(b) __fa526_cache_flush | |
28853ac8 | 909 | |
1da177e4 LT |
910 | @ These match on the architecture ID |
911 | ||
912 | .word 0x00020000 @ ARMv4T | |
913 | .word 0x000f0000 | |
0e056f20 CM |
914 | W(b) __armv4_mmu_cache_on |
915 | W(b) __armv4_mmu_cache_off | |
916 | W(b) __armv4_mmu_cache_flush | |
1da177e4 LT |
917 | |
918 | .word 0x00050000 @ ARMv5TE | |
919 | .word 0x000f0000 | |
0e056f20 CM |
920 | W(b) __armv4_mmu_cache_on |
921 | W(b) __armv4_mmu_cache_off | |
922 | W(b) __armv4_mmu_cache_flush | |
1da177e4 LT |
923 | |
924 | .word 0x00060000 @ ARMv5TEJ | |
925 | .word 0x000f0000 | |
0e056f20 CM |
926 | W(b) __armv4_mmu_cache_on |
927 | W(b) __armv4_mmu_cache_off | |
75216859 | 928 | W(b) __armv5tej_mmu_cache_flush |
1da177e4 | 929 | |
45a7b9cf | 930 | .word 0x0007b000 @ ARMv6 |
7d09e854 | 931 | .word 0x000ff000 |
5010192d | 932 | W(b) __armv6_mmu_cache_on |
0e056f20 CM |
933 | W(b) __armv4_mmu_cache_off |
934 | W(b) __armv6_mmu_cache_flush | |
1da177e4 | 935 | |
7d09e854 CM |
936 | .word 0x000f0000 @ new CPU Id |
937 | .word 0x000f0000 | |
0e056f20 CM |
938 | W(b) __armv7_mmu_cache_on |
939 | W(b) __armv7_mmu_cache_off | |
940 | W(b) __armv7_mmu_cache_flush | |
7d09e854 | 941 | |
1da177e4 LT |
942 | .word 0 @ unrecognised type |
943 | .word 0 | |
944 | mov pc, lr | |
0e056f20 | 945 | THUMB( nop ) |
1da177e4 | 946 | mov pc, lr |
0e056f20 | 947 | THUMB( nop ) |
1da177e4 | 948 | mov pc, lr |
0e056f20 | 949 | THUMB( nop ) |
1da177e4 LT |
950 | |
951 | .size proc_types, . - proc_types | |
952 | ||
946a105e DM |
953 | /* |
954 | * If you get a "non-constant expression in ".if" statement" | |
955 | * error from the assembler on this line, check that you have | |
956 | * not accidentally written a "b" instruction where you should | |
957 | * have written W(b). | |
958 | */ | |
959 | .if (. - proc_types) % PROC_ENTRY_SIZE != 0 | |
960 | .error "The size of one or more proc_types entries is wrong." | |
961 | .endif | |
962 | ||
1da177e4 LT |
963 | /* |
964 | * Turn off the Cache and MMU. ARMv3 does not support | |
965 | * reading the control register, but ARMv4 does. | |
966 | * | |
21b2841d UKK |
967 | * On exit, |
968 | * r0, r1, r2, r3, r9, r12 corrupted | |
969 | * This routine must preserve: | |
6d7d0ae5 | 970 | * r4, r7, r8 |
1da177e4 LT |
971 | */ |
972 | .align 5 | |
973 | cache_off: mov r3, #12 @ cache_off function | |
974 | b call_cache_fn | |
975 | ||
10c2df65 HC |
976 | __armv4_mpu_cache_off: |
977 | mrc p15, 0, r0, c1, c0 | |
978 | bic r0, r0, #0x000d | |
979 | mcr p15, 0, r0, c1, c0 @ turn MPU and cache off | |
980 | mov r0, #0 | |
981 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer | |
982 | mcr p15, 0, r0, c7, c6, 0 @ flush D-Cache | |
983 | mcr p15, 0, r0, c7, c5, 0 @ flush I-Cache | |
984 | mov pc, lr | |
985 | ||
986 | __armv3_mpu_cache_off: | |
987 | mrc p15, 0, r0, c1, c0 | |
988 | bic r0, r0, #0x000d | |
989 | mcr p15, 0, r0, c1, c0, 0 @ turn MPU and cache off | |
990 | mov r0, #0 | |
991 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 | |
992 | mov pc, lr | |
993 | ||
c76b6b41 | 994 | __armv4_mmu_cache_off: |
8bdca0ac | 995 | #ifdef CONFIG_MMU |
1da177e4 LT |
996 | mrc p15, 0, r0, c1, c0 |
997 | bic r0, r0, #0x000d | |
998 | mcr p15, 0, r0, c1, c0 @ turn MMU and cache off | |
999 | mov r0, #0 | |
1000 | mcr p15, 0, r0, c7, c7 @ invalidate whole cache v4 | |
1001 | mcr p15, 0, r0, c8, c7 @ invalidate whole TLB v4 | |
8bdca0ac | 1002 | #endif |
1da177e4 LT |
1003 | mov pc, lr |
1004 | ||
7d09e854 CM |
1005 | __armv7_mmu_cache_off: |
1006 | mrc p15, 0, r0, c1, c0 | |
8bdca0ac | 1007 | #ifdef CONFIG_MMU |
7d09e854 | 1008 | bic r0, r0, #0x000d |
8bdca0ac CM |
1009 | #else |
1010 | bic r0, r0, #0x000c | |
1011 | #endif | |
7d09e854 CM |
1012 | mcr p15, 0, r0, c1, c0 @ turn MMU and cache off |
1013 | mov r12, lr | |
1014 | bl __armv7_mmu_cache_flush | |
1015 | mov r0, #0 | |
8bdca0ac | 1016 | #ifdef CONFIG_MMU |
7d09e854 | 1017 | mcr p15, 0, r0, c8, c7, 0 @ invalidate whole TLB |
8bdca0ac | 1018 | #endif |
c30c2f99 CM |
1019 | mcr p15, 0, r0, c7, c5, 6 @ invalidate BTC |
1020 | mcr p15, 0, r0, c7, c10, 4 @ DSB | |
1021 | mcr p15, 0, r0, c7, c5, 4 @ ISB | |
7d09e854 CM |
1022 | mov pc, r12 |
1023 | ||
1da177e4 LT |
1024 | /* |
1025 | * Clean and flush the cache to maintain consistency. | |
1026 | * | |
1da177e4 | 1027 | * On exit, |
21b2841d | 1028 | * r1, r2, r3, r9, r10, r11, r12 corrupted |
1da177e4 | 1029 | * This routine must preserve: |
6d7d0ae5 | 1030 | * r4, r6, r7, r8 |
1da177e4 LT |
1031 | */ |
1032 | .align 5 | |
1033 | cache_clean_flush: | |
1034 | mov r3, #16 | |
1035 | b call_cache_fn | |
1036 | ||
10c2df65 HC |
1037 | __armv4_mpu_cache_flush: |
1038 | mov r2, #1 | |
1039 | mov r3, #0 | |
1040 | mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache | |
1041 | mov r1, #7 << 5 @ 8 segments | |
1042 | 1: orr r3, r1, #63 << 26 @ 64 entries | |
1043 | 2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index | |
1044 | subs r3, r3, #1 << 26 | |
1045 | bcs 2b @ entries 63 to 0 | |
1046 | subs r1, r1, #1 << 5 | |
1047 | bcs 1b @ segments 7 to 0 | |
1048 | ||
1049 | teq r2, #0 | |
1050 | mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache | |
1051 | mcr p15, 0, ip, c7, c10, 4 @ drain WB | |
1052 | mov pc, lr | |
1053 | ||
28853ac8 PZ |
1054 | __fa526_cache_flush: |
1055 | mov r1, #0 | |
1056 | mcr p15, 0, r1, c7, c14, 0 @ clean and invalidate D cache | |
1057 | mcr p15, 0, r1, c7, c5, 0 @ flush I cache | |
1058 | mcr p15, 0, r1, c7, c10, 4 @ drain WB | |
1059 | mov pc, lr | |
10c2df65 | 1060 | |
c76b6b41 | 1061 | __armv6_mmu_cache_flush: |
1da177e4 LT |
1062 | mov r1, #0 |
1063 | mcr p15, 0, r1, c7, c14, 0 @ clean+invalidate D | |
1064 | mcr p15, 0, r1, c7, c5, 0 @ invalidate I+BTB | |
1065 | mcr p15, 0, r1, c7, c15, 0 @ clean+invalidate unified | |
1066 | mcr p15, 0, r1, c7, c10, 4 @ drain WB | |
1067 | mov pc, lr | |
1068 | ||
7d09e854 CM |
1069 | __armv7_mmu_cache_flush: |
1070 | mrc p15, 0, r10, c0, c1, 5 @ read ID_MMFR1 | |
1071 | tst r10, #0xf << 16 @ hierarchical cache (ARMv7) | |
7d09e854 | 1072 | mov r10, #0 |
c30c2f99 | 1073 | beq hierarchical |
7d09e854 CM |
1074 | mcr p15, 0, r10, c7, c14, 0 @ clean+invalidate D |
1075 | b iflush | |
1076 | hierarchical: | |
c30c2f99 | 1077 | mcr p15, 0, r10, c7, c10, 5 @ DMB |
0e056f20 | 1078 | stmfd sp!, {r0-r7, r9-r11} |
7d09e854 CM |
1079 | mrc p15, 1, r0, c0, c0, 1 @ read clidr |
1080 | ands r3, r0, #0x7000000 @ extract loc from clidr | |
1081 | mov r3, r3, lsr #23 @ left align loc bit field | |
1082 | beq finished @ if loc is 0, then no need to clean | |
1083 | mov r10, #0 @ start clean at cache level 0 | |
1084 | loop1: | |
1085 | add r2, r10, r10, lsr #1 @ work out 3x current cache level | |
1086 | mov r1, r0, lsr r2 @ extract cache type bits from clidr | |
1087 | and r1, r1, #7 @ mask of the bits for current cache only | |
1088 | cmp r1, #2 @ see what cache we have at this level | |
1089 | blt skip @ skip if no cache, or just i-cache | |
1090 | mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr | |
1091 | mcr p15, 0, r10, c7, c5, 4 @ isb to sych the new cssr&csidr | |
1092 | mrc p15, 1, r1, c0, c0, 0 @ read the new csidr | |
1093 | and r2, r1, #7 @ extract the length of the cache lines | |
1094 | add r2, r2, #4 @ add 4 (line length offset) | |
1095 | ldr r4, =0x3ff | |
1096 | ands r4, r4, r1, lsr #3 @ find maximum number on the way size | |
000b5025 | 1097 | clz r5, r4 @ find bit position of way size increment |
7d09e854 CM |
1098 | ldr r7, =0x7fff |
1099 | ands r7, r7, r1, lsr #13 @ extract max number of the index size | |
1100 | loop2: | |
1101 | mov r9, r4 @ create working copy of max way size | |
1102 | loop3: | |
0e056f20 CM |
1103 | ARM( orr r11, r10, r9, lsl r5 ) @ factor way and cache number into r11 |
1104 | ARM( orr r11, r11, r7, lsl r2 ) @ factor index number into r11 | |
1105 | THUMB( lsl r6, r9, r5 ) | |
1106 | THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11 | |
1107 | THUMB( lsl r6, r7, r2 ) | |
1108 | THUMB( orr r11, r11, r6 ) @ factor index number into r11 | |
7d09e854 CM |
1109 | mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way |
1110 | subs r9, r9, #1 @ decrement the way | |
1111 | bge loop3 | |
1112 | subs r7, r7, #1 @ decrement the index | |
1113 | bge loop2 | |
1114 | skip: | |
1115 | add r10, r10, #2 @ increment cache number | |
1116 | cmp r3, r10 | |
1117 | bgt loop1 | |
1118 | finished: | |
0e056f20 | 1119 | ldmfd sp!, {r0-r7, r9-r11} |
7d09e854 CM |
1120 | mov r10, #0 @ swith back to cache level 0 |
1121 | mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr | |
7d09e854 | 1122 | iflush: |
c30c2f99 | 1123 | mcr p15, 0, r10, c7, c10, 4 @ DSB |
7d09e854 | 1124 | mcr p15, 0, r10, c7, c5, 0 @ invalidate I+BTB |
c30c2f99 CM |
1125 | mcr p15, 0, r10, c7, c10, 4 @ DSB |
1126 | mcr p15, 0, r10, c7, c5, 4 @ ISB | |
7d09e854 CM |
1127 | mov pc, lr |
1128 | ||
15754bf9 NP |
1129 | __armv5tej_mmu_cache_flush: |
1130 | 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate D cache | |
1131 | bne 1b | |
1132 | mcr p15, 0, r0, c7, c5, 0 @ flush I cache | |
1133 | mcr p15, 0, r0, c7, c10, 4 @ drain WB | |
1134 | mov pc, lr | |
1135 | ||
c76b6b41 | 1136 | __armv4_mmu_cache_flush: |
1da177e4 LT |
1137 | mov r2, #64*1024 @ default: 32K dcache size (*2) |
1138 | mov r11, #32 @ default: 32 byte line size | |
1139 | mrc p15, 0, r3, c0, c0, 1 @ read cache type | |
98e12b5a | 1140 | teq r3, r9 @ cache ID register present? |
1da177e4 LT |
1141 | beq no_cache_id |
1142 | mov r1, r3, lsr #18 | |
1143 | and r1, r1, #7 | |
1144 | mov r2, #1024 | |
1145 | mov r2, r2, lsl r1 @ base dcache size *2 | |
1146 | tst r3, #1 << 14 @ test M bit | |
1147 | addne r2, r2, r2, lsr #1 @ +1/2 size if M == 1 | |
1148 | mov r3, r3, lsr #12 | |
1149 | and r3, r3, #3 | |
1150 | mov r11, #8 | |
1151 | mov r11, r11, lsl r3 @ cache line size in bytes | |
1152 | no_cache_id: | |
0e056f20 CM |
1153 | mov r1, pc |
1154 | bic r1, r1, #63 @ align to longest cache line | |
1da177e4 | 1155 | add r2, r1, r2 |
0e056f20 CM |
1156 | 1: |
1157 | ARM( ldr r3, [r1], r11 ) @ s/w flush D cache | |
1158 | THUMB( ldr r3, [r1] ) @ s/w flush D cache | |
1159 | THUMB( add r1, r1, r11 ) | |
1da177e4 LT |
1160 | teq r1, r2 |
1161 | bne 1b | |
1162 | ||
1163 | mcr p15, 0, r1, c7, c5, 0 @ flush I cache | |
1164 | mcr p15, 0, r1, c7, c6, 0 @ flush D cache | |
1165 | mcr p15, 0, r1, c7, c10, 4 @ drain WB | |
1166 | mov pc, lr | |
1167 | ||
c76b6b41 | 1168 | __armv3_mmu_cache_flush: |
10c2df65 | 1169 | __armv3_mpu_cache_flush: |
1da177e4 | 1170 | mov r1, #0 |
63fa7187 | 1171 | mcr p15, 0, r1, c7, c0, 0 @ invalidate whole cache v3 |
1da177e4 LT |
1172 | mov pc, lr |
1173 | ||
1174 | /* | |
1175 | * Various debugging routines for printing hex characters and | |
1176 | * memory, which again must be relocatable. | |
1177 | */ | |
1178 | #ifdef DEBUG | |
88987ef9 | 1179 | .align 2 |
1da177e4 LT |
1180 | .type phexbuf,#object |
1181 | phexbuf: .space 12 | |
1182 | .size phexbuf, . - phexbuf | |
1183 | ||
be6f9f00 | 1184 | @ phex corrupts {r0, r1, r2, r3} |
1da177e4 LT |
1185 | phex: adr r3, phexbuf |
1186 | mov r2, #0 | |
1187 | strb r2, [r3, r1] | |
1188 | 1: subs r1, r1, #1 | |
1189 | movmi r0, r3 | |
1190 | bmi puts | |
1191 | and r2, r0, #15 | |
1192 | mov r0, r0, lsr #4 | |
1193 | cmp r2, #10 | |
1194 | addge r2, r2, #7 | |
1195 | add r2, r2, #'0' | |
1196 | strb r2, [r3, r1] | |
1197 | b 1b | |
1198 | ||
be6f9f00 | 1199 | @ puts corrupts {r0, r1, r2, r3} |
4e6d488a | 1200 | puts: loadsp r3, r1 |
1da177e4 LT |
1201 | 1: ldrb r2, [r0], #1 |
1202 | teq r2, #0 | |
1203 | moveq pc, lr | |
5cd0c344 | 1204 | 2: writeb r2, r3 |
1da177e4 LT |
1205 | mov r1, #0x00020000 |
1206 | 3: subs r1, r1, #1 | |
1207 | bne 3b | |
1208 | teq r2, #'\n' | |
1209 | moveq r2, #'\r' | |
1210 | beq 2b | |
1211 | teq r0, #0 | |
1212 | bne 1b | |
1213 | mov pc, lr | |
be6f9f00 | 1214 | @ putc corrupts {r0, r1, r2, r3} |
1da177e4 LT |
1215 | putc: |
1216 | mov r2, r0 | |
1217 | mov r0, #0 | |
4e6d488a | 1218 | loadsp r3, r1 |
1da177e4 LT |
1219 | b 2b |
1220 | ||
be6f9f00 | 1221 | @ memdump corrupts {r0, r1, r2, r3, r10, r11, r12, lr} |
1da177e4 LT |
1222 | memdump: mov r12, r0 |
1223 | mov r10, lr | |
1224 | mov r11, #0 | |
1225 | 2: mov r0, r11, lsl #2 | |
1226 | add r0, r0, r12 | |
1227 | mov r1, #8 | |
1228 | bl phex | |
1229 | mov r0, #':' | |
1230 | bl putc | |
1231 | 1: mov r0, #' ' | |
1232 | bl putc | |
1233 | ldr r0, [r12, r11, lsl #2] | |
1234 | mov r1, #8 | |
1235 | bl phex | |
1236 | and r0, r11, #7 | |
1237 | teq r0, #3 | |
1238 | moveq r0, #' ' | |
1239 | bleq putc | |
1240 | and r0, r11, #7 | |
1241 | add r11, r11, #1 | |
1242 | teq r0, #7 | |
1243 | bne 1b | |
1244 | mov r0, #'\n' | |
1245 | bl putc | |
1246 | cmp r11, #64 | |
1247 | blt 2b | |
1248 | mov pc, r10 | |
1249 | #endif | |
1250 | ||
92c83ff1 | 1251 | .ltorg |
424e5994 DM |
1252 | |
1253 | #ifdef CONFIG_ARM_VIRT_EXT | |
1254 | .align 5 | |
1255 | __hyp_reentry_vectors: | |
1256 | W(b) . @ reset | |
1257 | W(b) . @ undef | |
1258 | W(b) . @ svc | |
1259 | W(b) . @ pabort | |
1260 | W(b) . @ dabort | |
1261 | W(b) __enter_kernel @ hyp | |
1262 | W(b) . @ irq | |
1263 | W(b) . @ fiq | |
1264 | #endif /* CONFIG_ARM_VIRT_EXT */ | |
1265 | ||
1266 | __enter_kernel: | |
1267 | mov r0, #0 @ must be 0 | |
1268 | ARM( mov pc, r4 ) @ call kernel | |
1269 | THUMB( bx r4 ) @ entry point is always ARM | |
1270 | ||
adcc2591 | 1271 | reloc_code_end: |
1da177e4 LT |
1272 | |
1273 | .align | |
b0c4d4ee | 1274 | .section ".stack", "aw", %nobits |
8d7e4cc2 NP |
1275 | .L_user_stack: .space 4096 |
1276 | .L_user_stack_end: |