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 LT |
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) |
7d95ded9 | 23 | |
dfad549d | 24 | #if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7) |
4e6d488a | 25 | .macro loadsp, rb, tmp |
7d95ded9 TL |
26 | .endm |
27 | .macro writeb, ch, rb | |
28 | mcr p14, 0, \ch, c0, c5, 0 | |
29 | .endm | |
c633c3cf | 30 | #elif defined(CONFIG_CPU_XSCALE) |
4e6d488a | 31 | .macro loadsp, rb, tmp |
c633c3cf JCPV |
32 | .endm |
33 | .macro writeb, ch, rb | |
34 | mcr p14, 0, \ch, c8, c0, 0 | |
35 | .endm | |
7d95ded9 | 36 | #else |
4e6d488a | 37 | .macro loadsp, rb, tmp |
1da177e4 | 38 | .endm |
224b5be6 | 39 | .macro writeb, ch, rb |
41a9e680 | 40 | mcr p14, 0, \ch, c1, c0, 0 |
1da177e4 | 41 | .endm |
7d95ded9 TL |
42 | #endif |
43 | ||
5cd0c344 | 44 | #else |
224b5be6 | 45 | |
a09e64fb | 46 | #include <mach/debug-macro.S> |
224b5be6 | 47 | |
5cd0c344 RK |
48 | .macro writeb, ch, rb |
49 | senduart \ch, \rb | |
1da177e4 | 50 | .endm |
5cd0c344 | 51 | |
224b5be6 | 52 | #if defined(CONFIG_ARCH_SA1100) |
4e6d488a | 53 | .macro loadsp, rb, tmp |
1da177e4 | 54 | mov \rb, #0x80000000 @ physical base address |
224b5be6 | 55 | #ifdef CONFIG_DEBUG_LL_SER3 |
1da177e4 | 56 | add \rb, \rb, #0x00050000 @ Ser3 |
224b5be6 | 57 | #else |
1da177e4 | 58 | add \rb, \rb, #0x00010000 @ Ser1 |
224b5be6 | 59 | #endif |
1da177e4 | 60 | .endm |
b130d5c2 | 61 | #elif defined(CONFIG_ARCH_S3C24XX) |
4e6d488a | 62 | .macro loadsp, rb, tmp |
1da177e4 | 63 | mov \rb, #0x50000000 |
c7657846 | 64 | add \rb, \rb, #0x4000 * CONFIG_S3C_LOWLEVEL_UART_PORT |
1da177e4 | 65 | .endm |
1da177e4 | 66 | #else |
4e6d488a TL |
67 | .macro loadsp, rb, tmp |
68 | addruart \rb, \tmp | |
224b5be6 | 69 | .endm |
1da177e4 | 70 | #endif |
5cd0c344 | 71 | #endif |
1da177e4 LT |
72 | #endif |
73 | ||
74 | .macro kputc,val | |
75 | mov r0, \val | |
76 | bl putc | |
77 | .endm | |
78 | ||
79 | .macro kphex,val,len | |
80 | mov r0, \val | |
81 | mov r1, #\len | |
82 | bl phex | |
83 | .endm | |
84 | ||
85 | .macro debug_reloc_start | |
86 | #ifdef DEBUG | |
87 | kputc #'\n' | |
88 | kphex r6, 8 /* processor id */ | |
89 | kputc #':' | |
90 | kphex r7, 8 /* architecture id */ | |
f12d0d7c | 91 | #ifdef CONFIG_CPU_CP15 |
1da177e4 LT |
92 | kputc #':' |
93 | mrc p15, 0, r0, c1, c0 | |
94 | kphex r0, 8 /* control reg */ | |
f12d0d7c | 95 | #endif |
1da177e4 LT |
96 | kputc #'\n' |
97 | kphex r5, 8 /* decompressed kernel start */ | |
98 | kputc #'-' | |
f4619025 | 99 | kphex r9, 8 /* decompressed kernel end */ |
1da177e4 LT |
100 | kputc #'>' |
101 | kphex r4, 8 /* kernel execution address */ | |
102 | kputc #'\n' | |
103 | #endif | |
104 | .endm | |
105 | ||
106 | .macro debug_reloc_end | |
107 | #ifdef DEBUG | |
108 | kphex r5, 8 /* end of kernel */ | |
109 | kputc #'\n' | |
110 | mov r0, r4 | |
111 | bl memdump /* dump 256 bytes at start of kernel */ | |
112 | #endif | |
113 | .endm | |
114 | ||
115 | .section ".start", #alloc, #execinstr | |
116 | /* | |
117 | * sort out different calling conventions | |
118 | */ | |
119 | .align | |
26e5ca93 | 120 | .arm @ Always enter in ARM state |
1da177e4 LT |
121 | start: |
122 | .type start,#function | |
b11fe388 | 123 | .rept 7 |
1da177e4 LT |
124 | mov r0, r0 |
125 | .endr | |
b11fe388 NP |
126 | ARM( mov r0, r0 ) |
127 | ARM( b 1f ) | |
128 | THUMB( adr r12, BSYM(1f) ) | |
129 | THUMB( bx r12 ) | |
1da177e4 | 130 | |
1da177e4 LT |
131 | .word 0x016f2818 @ Magic numbers to help the loader |
132 | .word start @ absolute load/run zImage address | |
133 | .word _edata @ zImage end address | |
26e5ca93 | 134 | THUMB( .thumb ) |
1da177e4 | 135 | 1: mov r7, r1 @ save architecture ID |
f4619025 | 136 | mov r8, r2 @ save atags pointer |
1da177e4 LT |
137 | |
138 | #ifndef __ARM_ARCH_2__ | |
139 | /* | |
140 | * Booting from Angel - need to enter SVC mode and disable | |
141 | * FIQs/IRQs (numeric definitions from angel arm.h source). | |
142 | * We only do this if we were in user mode on entry. | |
143 | */ | |
144 | mrs r2, cpsr @ get current mode | |
145 | tst r2, #3 @ not user? | |
146 | bne not_angel | |
147 | mov r0, #0x17 @ angel_SWIreason_EnterSVC | |
0e056f20 CM |
148 | ARM( swi 0x123456 ) @ angel_SWI_ARM |
149 | THUMB( svc 0xab ) @ angel_SWI_THUMB | |
1da177e4 LT |
150 | not_angel: |
151 | mrs r2, cpsr @ turn off interrupts to | |
152 | orr r2, r2, #0xc0 @ prevent angel from running | |
153 | msr cpsr_c, r2 | |
154 | #else | |
155 | teqp pc, #0x0c000003 @ turn off interrupts | |
156 | #endif | |
157 | ||
158 | /* | |
159 | * Note that some cache flushing and other stuff may | |
160 | * be needed here - is there an Angel SWI call for this? | |
161 | */ | |
162 | ||
163 | /* | |
164 | * some architecture specific code can be inserted | |
f4619025 | 165 | * by the linker here, but it should preserve r7, r8, and r9. |
1da177e4 LT |
166 | */ |
167 | ||
168 | .text | |
6d7d0ae5 | 169 | |
e69edc79 EM |
170 | #ifdef CONFIG_AUTO_ZRELADDR |
171 | @ determine final kernel image address | |
bfa64c4a DM |
172 | mov r4, pc |
173 | and r4, r4, #0xf8000000 | |
e69edc79 EM |
174 | add r4, r4, #TEXT_OFFSET |
175 | #else | |
9e84ed63 | 176 | ldr r4, =zreladdr |
e69edc79 | 177 | #endif |
1da177e4 | 178 | |
6d7d0ae5 NP |
179 | bl cache_on |
180 | ||
181 | restart: adr r0, LC0 | |
34cc1a8f | 182 | ldmia r0, {r1, r2, r3, r6, r10, r11, r12} |
adcc2591 | 183 | ldr sp, [r0, #28] |
6d7d0ae5 NP |
184 | |
185 | /* | |
186 | * We might be running at a different address. We need | |
187 | * to fix up various pointers. | |
188 | */ | |
189 | sub r0, r0, r1 @ calculate the delta offset | |
6d7d0ae5 | 190 | add r6, r6, r0 @ _edata |
34cc1a8f NP |
191 | add r10, r10, r0 @ inflated kernel size location |
192 | ||
193 | /* | |
194 | * The kernel build system appends the size of the | |
195 | * decompressed kernel at the end of the compressed data | |
196 | * in little-endian form. | |
197 | */ | |
198 | ldrb r9, [r10, #0] | |
199 | ldrb lr, [r10, #1] | |
200 | orr r9, r9, lr, lsl #8 | |
201 | ldrb lr, [r10, #2] | |
202 | ldrb r10, [r10, #3] | |
203 | orr r9, r9, lr, lsl #16 | |
204 | orr r9, r9, r10, lsl #24 | |
1da177e4 | 205 | |
6d7d0ae5 NP |
206 | #ifndef CONFIG_ZBOOT_ROM |
207 | /* malloc space is above the relocated stack (64k max) */ | |
208 | add sp, sp, r0 | |
209 | add r10, sp, #0x10000 | |
210 | #else | |
1da177e4 | 211 | /* |
6d7d0ae5 NP |
212 | * With ZBOOT_ROM the bss/stack is non relocatable, |
213 | * but someone could still run this code from RAM, | |
214 | * in which case our reference is _edata. | |
1da177e4 | 215 | */ |
6d7d0ae5 NP |
216 | mov r10, r6 |
217 | #endif | |
218 | ||
e2a6a3aa JB |
219 | mov r5, #0 @ init dtb size to 0 |
220 | #ifdef CONFIG_ARM_APPENDED_DTB | |
221 | /* | |
222 | * r0 = delta | |
223 | * r2 = BSS start | |
224 | * r3 = BSS end | |
225 | * r4 = final kernel address | |
226 | * r5 = appended dtb size (still unknown) | |
227 | * r6 = _edata | |
228 | * r7 = architecture ID | |
229 | * r8 = atags/device tree pointer | |
230 | * r9 = size of decompressed image | |
231 | * r10 = end of this image, including bss/stack/malloc space if non XIP | |
232 | * r11 = GOT start | |
233 | * r12 = GOT end | |
234 | * sp = stack pointer | |
235 | * | |
236 | * if there are device trees (dtb) appended to zImage, advance r10 so that the | |
237 | * dtb data will get relocated along with the kernel if necessary. | |
238 | */ | |
239 | ||
240 | ldr lr, [r6, #0] | |
241 | #ifndef __ARMEB__ | |
242 | ldr r1, =0xedfe0dd0 @ sig is 0xd00dfeed big endian | |
243 | #else | |
244 | ldr r1, =0xd00dfeed | |
245 | #endif | |
246 | cmp lr, r1 | |
247 | bne dtb_check_done @ not found | |
248 | ||
b90b9a38 NP |
249 | #ifdef CONFIG_ARM_ATAG_DTB_COMPAT |
250 | /* | |
251 | * OK... Let's do some funky business here. | |
252 | * If we do have a DTB appended to zImage, and we do have | |
253 | * an ATAG list around, we want the later to be translated | |
254 | * and folded into the former here. To be on the safe side, | |
255 | * let's temporarily move the stack away into the malloc | |
256 | * area. No GOT fixup has occurred yet, but none of the | |
257 | * code we're about to call uses any global variable. | |
258 | */ | |
259 | add sp, sp, #0x10000 | |
260 | stmfd sp!, {r0-r3, ip, lr} | |
261 | mov r0, r8 | |
262 | mov r1, r6 | |
263 | sub r2, sp, r6 | |
264 | bl atags_to_fdt | |
265 | ||
266 | /* | |
267 | * If returned value is 1, there is no ATAG at the location | |
268 | * pointed by r8. Try the typical 0x100 offset from start | |
269 | * of RAM and hope for the best. | |
270 | */ | |
271 | cmp r0, #1 | |
531a6a94 NP |
272 | sub r0, r4, #TEXT_OFFSET |
273 | add r0, r0, #0x100 | |
b90b9a38 NP |
274 | mov r1, r6 |
275 | sub r2, sp, r6 | |
9c5fd9e8 | 276 | bleq atags_to_fdt |
b90b9a38 NP |
277 | |
278 | ldmfd sp!, {r0-r3, ip, lr} | |
279 | sub sp, sp, #0x10000 | |
280 | #endif | |
281 | ||
e2a6a3aa JB |
282 | mov r8, r6 @ use the appended device tree |
283 | ||
5ffb04f6 NP |
284 | /* |
285 | * Make sure that the DTB doesn't end up in the final | |
286 | * kernel's .bss area. To do so, we adjust the decompressed | |
287 | * kernel size to compensate if that .bss size is larger | |
288 | * than the relocated code. | |
289 | */ | |
290 | ldr r5, =_kernel_bss_size | |
291 | adr r1, wont_overwrite | |
292 | sub r1, r6, r1 | |
293 | subs r1, r5, r1 | |
294 | addhi r9, r9, r1 | |
295 | ||
e2a6a3aa JB |
296 | /* Get the dtb's size */ |
297 | ldr r5, [r6, #4] | |
298 | #ifndef __ARMEB__ | |
299 | /* convert r5 (dtb size) to little endian */ | |
300 | eor r1, r5, r5, ror #16 | |
301 | bic r1, r1, #0x00ff0000 | |
302 | mov r5, r5, ror #8 | |
303 | eor r5, r5, r1, lsr #8 | |
304 | #endif | |
305 | ||
306 | /* preserve 64-bit alignment */ | |
307 | add r5, r5, #7 | |
308 | bic r5, r5, #7 | |
309 | ||
310 | /* relocate some pointers past the appended dtb */ | |
311 | add r6, r6, r5 | |
312 | add r10, r10, r5 | |
313 | add sp, sp, r5 | |
314 | dtb_check_done: | |
315 | #endif | |
316 | ||
6d7d0ae5 NP |
317 | /* |
318 | * Check to see if we will overwrite ourselves. | |
319 | * r4 = final kernel address | |
6d7d0ae5 NP |
320 | * r9 = size of decompressed image |
321 | * r10 = end of this image, including bss/stack/malloc space if non XIP | |
322 | * We basically want: | |
ea9df3b1 | 323 | * r4 - 16k page directory >= r10 -> OK |
5ffb04f6 | 324 | * r4 + image length <= address of wont_overwrite -> OK |
6d7d0ae5 | 325 | */ |
ea9df3b1 | 326 | add r10, r10, #16384 |
6d7d0ae5 NP |
327 | cmp r4, r10 |
328 | bhs wont_overwrite | |
329 | add r10, r4, r9 | |
5ffb04f6 NP |
330 | adr r9, wont_overwrite |
331 | cmp r10, r9 | |
6d7d0ae5 NP |
332 | bls wont_overwrite |
333 | ||
334 | /* | |
335 | * Relocate ourselves past the end of the decompressed kernel. | |
6d7d0ae5 NP |
336 | * r6 = _edata |
337 | * r10 = end of the decompressed kernel | |
338 | * Because we always copy ahead, we need to do it from the end and go | |
339 | * backward in case the source and destination overlap. | |
340 | */ | |
adcc2591 NP |
341 | /* |
342 | * Bump to the next 256-byte boundary with the size of | |
343 | * the relocation code added. This avoids overwriting | |
344 | * ourself when the offset is small. | |
345 | */ | |
346 | add r10, r10, #((reloc_code_end - restart + 256) & ~255) | |
6d7d0ae5 NP |
347 | bic r10, r10, #255 |
348 | ||
adcc2591 NP |
349 | /* Get start of code we want to copy and align it down. */ |
350 | adr r5, restart | |
351 | bic r5, r5, #31 | |
352 | ||
6d7d0ae5 NP |
353 | sub r9, r6, r5 @ size to copy |
354 | add r9, r9, #31 @ rounded up to a multiple | |
355 | bic r9, r9, #31 @ ... of 32 bytes | |
356 | add r6, r9, r5 | |
357 | add r9, r9, r10 | |
358 | ||
359 | 1: ldmdb r6!, {r0 - r3, r10 - r12, lr} | |
360 | cmp r6, r5 | |
361 | stmdb r9!, {r0 - r3, r10 - r12, lr} | |
362 | bhi 1b | |
363 | ||
364 | /* Preserve offset to relocated code. */ | |
365 | sub r6, r9, r6 | |
366 | ||
7c2527f0 TL |
367 | #ifndef CONFIG_ZBOOT_ROM |
368 | /* cache_clean_flush may use the stack, so relocate it */ | |
369 | add sp, sp, r6 | |
370 | #endif | |
371 | ||
6d7d0ae5 NP |
372 | bl cache_clean_flush |
373 | ||
374 | adr r0, BSYM(restart) | |
375 | add r0, r0, r6 | |
376 | mov pc, r0 | |
377 | ||
378 | wont_overwrite: | |
379 | /* | |
380 | * If delta is zero, we are running at the address we were linked at. | |
381 | * r0 = delta | |
382 | * r2 = BSS start | |
383 | * r3 = BSS end | |
384 | * r4 = kernel execution address | |
e2a6a3aa | 385 | * r5 = appended dtb size (0 if not present) |
6d7d0ae5 NP |
386 | * r7 = architecture ID |
387 | * r8 = atags pointer | |
388 | * r11 = GOT start | |
389 | * r12 = GOT end | |
390 | * sp = stack pointer | |
391 | */ | |
e2a6a3aa | 392 | orrs r1, r0, r5 |
6d7d0ae5 | 393 | beq not_relocated |
e2a6a3aa | 394 | |
98e12b5a | 395 | add r11, r11, r0 |
6d7d0ae5 | 396 | add r12, r12, r0 |
1da177e4 LT |
397 | |
398 | #ifndef CONFIG_ZBOOT_ROM | |
399 | /* | |
400 | * If we're running fully PIC === CONFIG_ZBOOT_ROM = n, | |
401 | * we need to fix up pointers into the BSS region. | |
6d7d0ae5 | 402 | * Note that the stack pointer has already been fixed up. |
1da177e4 LT |
403 | */ |
404 | add r2, r2, r0 | |
405 | add r3, r3, r0 | |
1da177e4 LT |
406 | |
407 | /* | |
408 | * Relocate all entries in the GOT table. | |
e2a6a3aa | 409 | * Bump bss entries to _edata + dtb size |
1da177e4 | 410 | */ |
98e12b5a | 411 | 1: ldr r1, [r11, #0] @ relocate entries in the GOT |
e2a6a3aa JB |
412 | add r1, r1, r0 @ This fixes up C references |
413 | cmp r1, r2 @ if entry >= bss_start && | |
414 | cmphs r3, r1 @ bss_end > entry | |
415 | addhi r1, r1, r5 @ entry += dtb size | |
416 | str r1, [r11], #4 @ next entry | |
6d7d0ae5 | 417 | cmp r11, r12 |
1da177e4 | 418 | blo 1b |
e2a6a3aa JB |
419 | |
420 | /* bump our bss pointers too */ | |
421 | add r2, r2, r5 | |
422 | add r3, r3, r5 | |
423 | ||
1da177e4 LT |
424 | #else |
425 | ||
426 | /* | |
427 | * Relocate entries in the GOT table. We only relocate | |
428 | * the entries that are outside the (relocated) BSS region. | |
429 | */ | |
98e12b5a | 430 | 1: ldr r1, [r11, #0] @ relocate entries in the GOT |
1da177e4 LT |
431 | cmp r1, r2 @ entry < bss_start || |
432 | cmphs r3, r1 @ _end < entry | |
433 | addlo r1, r1, r0 @ table. This fixes up the | |
98e12b5a | 434 | str r1, [r11], #4 @ C references. |
6d7d0ae5 | 435 | cmp r11, r12 |
1da177e4 LT |
436 | blo 1b |
437 | #endif | |
438 | ||
439 | not_relocated: mov r0, #0 | |
440 | 1: str r0, [r2], #4 @ clear bss | |
441 | str r0, [r2], #4 | |
442 | str r0, [r2], #4 | |
443 | str r0, [r2], #4 | |
444 | cmp r2, r3 | |
445 | blo 1b | |
446 | ||
1da177e4 | 447 | /* |
6d7d0ae5 NP |
448 | * The C runtime environment should now be setup sufficiently. |
449 | * Set up some pointers, and start decompressing. | |
450 | * r4 = kernel execution address | |
451 | * r7 = architecture ID | |
452 | * r8 = atags pointer | |
1da177e4 | 453 | */ |
6d7d0ae5 NP |
454 | mov r0, r4 |
455 | mov r1, sp @ malloc space above stack | |
456 | add r2, sp, #0x10000 @ 64k max | |
1da177e4 LT |
457 | mov r3, r7 |
458 | bl decompress_kernel | |
1da177e4 | 459 | bl cache_clean_flush |
6d7d0ae5 NP |
460 | bl cache_off |
461 | mov r0, #0 @ must be zero | |
462 | mov r1, r7 @ restore architecture number | |
463 | mov r2, r8 @ restore atags pointer | |
540b5738 DM |
464 | ARM( mov pc, r4 ) @ call kernel |
465 | THUMB( bx r4 ) @ entry point is always ARM | |
1da177e4 | 466 | |
88987ef9 | 467 | .align 2 |
1da177e4 LT |
468 | .type LC0, #object |
469 | LC0: .word LC0 @ r1 | |
470 | .word __bss_start @ r2 | |
471 | .word _end @ r3 | |
6d7d0ae5 | 472 | .word _edata @ r6 |
34cc1a8f | 473 | .word input_data_end - 4 @ r10 (inflated size location) |
98e12b5a | 474 | .word _got_start @ r11 |
1da177e4 | 475 | .word _got_end @ ip |
8d7e4cc2 | 476 | .word .L_user_stack_end @ sp |
1da177e4 LT |
477 | .size LC0, . - LC0 |
478 | ||
479 | #ifdef CONFIG_ARCH_RPC | |
480 | .globl params | |
db7b2b4b | 481 | params: ldr r0, =0x10000100 @ params_phys for RPC |
1da177e4 LT |
482 | mov pc, lr |
483 | .ltorg | |
484 | .align | |
485 | #endif | |
486 | ||
487 | /* | |
488 | * Turn on the cache. We need to setup some page tables so that we | |
489 | * can have both the I and D caches on. | |
490 | * | |
491 | * We place the page tables 16k down from the kernel execution address, | |
492 | * and we hope that nothing else is using it. If we're using it, we | |
493 | * will go pop! | |
494 | * | |
495 | * On entry, | |
496 | * r4 = kernel execution address | |
1da177e4 | 497 | * r7 = architecture number |
f4619025 | 498 | * r8 = atags pointer |
1da177e4 | 499 | * On exit, |
21b2841d | 500 | * r0, r1, r2, r3, r9, r10, r12 corrupted |
1da177e4 | 501 | * This routine must preserve: |
6d7d0ae5 | 502 | * r4, r7, r8 |
1da177e4 LT |
503 | */ |
504 | .align 5 | |
505 | cache_on: mov r3, #8 @ cache_on function | |
506 | b call_cache_fn | |
507 | ||
10c2df65 HC |
508 | /* |
509 | * Initialize the highest priority protection region, PR7 | |
510 | * to cover all 32bit address and cacheable and bufferable. | |
511 | */ | |
512 | __armv4_mpu_cache_on: | |
513 | mov r0, #0x3f @ 4G, the whole | |
514 | mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting | |
515 | mcr p15, 0, r0, c6, c7, 1 | |
516 | ||
517 | mov r0, #0x80 @ PR7 | |
518 | mcr p15, 0, r0, c2, c0, 0 @ D-cache on | |
519 | mcr p15, 0, r0, c2, c0, 1 @ I-cache on | |
520 | mcr p15, 0, r0, c3, c0, 0 @ write-buffer on | |
521 | ||
522 | mov r0, #0xc000 | |
523 | mcr p15, 0, r0, c5, c0, 1 @ I-access permission | |
524 | mcr p15, 0, r0, c5, c0, 0 @ D-access permission | |
525 | ||
526 | mov r0, #0 | |
527 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer | |
528 | mcr p15, 0, r0, c7, c5, 0 @ flush(inval) I-Cache | |
529 | mcr p15, 0, r0, c7, c6, 0 @ flush(inval) D-Cache | |
530 | mrc p15, 0, r0, c1, c0, 0 @ read control reg | |
531 | @ ...I .... ..D. WC.M | |
532 | orr r0, r0, #0x002d @ .... .... ..1. 11.1 | |
533 | orr r0, r0, #0x1000 @ ...1 .... .... .... | |
534 | ||
535 | mcr p15, 0, r0, c1, c0, 0 @ write control reg | |
536 | ||
537 | mov r0, #0 | |
538 | mcr p15, 0, r0, c7, c5, 0 @ flush(inval) I-Cache | |
539 | mcr p15, 0, r0, c7, c6, 0 @ flush(inval) D-Cache | |
540 | mov pc, lr | |
541 | ||
542 | __armv3_mpu_cache_on: | |
543 | mov r0, #0x3f @ 4G, the whole | |
544 | mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting | |
545 | ||
546 | mov r0, #0x80 @ PR7 | |
547 | mcr p15, 0, r0, c2, c0, 0 @ cache on | |
548 | mcr p15, 0, r0, c3, c0, 0 @ write-buffer on | |
549 | ||
550 | mov r0, #0xc000 | |
551 | mcr p15, 0, r0, c5, c0, 0 @ access permission | |
552 | ||
553 | mov r0, #0 | |
554 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 | |
4a8d57a5 UKK |
555 | /* |
556 | * ?? ARMv3 MMU does not allow reading the control register, | |
557 | * does this really work on ARMv3 MPU? | |
558 | */ | |
10c2df65 HC |
559 | mrc p15, 0, r0, c1, c0, 0 @ read control reg |
560 | @ .... .... .... WC.M | |
561 | orr r0, r0, #0x000d @ .... .... .... 11.1 | |
4a8d57a5 | 562 | /* ?? this overwrites the value constructed above? */ |
10c2df65 HC |
563 | mov r0, #0 |
564 | mcr p15, 0, r0, c1, c0, 0 @ write control reg | |
565 | ||
4a8d57a5 | 566 | /* ?? invalidate for the second time? */ |
10c2df65 HC |
567 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 |
568 | mov pc, lr | |
569 | ||
1da177e4 LT |
570 | __setup_mmu: sub r3, r4, #16384 @ Page directory size |
571 | bic r3, r3, #0xff @ Align the pointer | |
572 | bic r3, r3, #0x3f00 | |
573 | /* | |
574 | * Initialise the page tables, turning on the cacheable and bufferable | |
575 | * bits for the RAM area only. | |
576 | */ | |
577 | mov r0, r3 | |
f4619025 RK |
578 | mov r9, r0, lsr #18 |
579 | mov r9, r9, lsl #18 @ start of RAM | |
580 | add r10, r9, #0x10000000 @ a reasonable RAM size | |
1da177e4 LT |
581 | mov r1, #0x12 |
582 | orr r1, r1, #3 << 10 | |
583 | add r2, r3, #16384 | |
265d5e48 | 584 | 1: cmp r1, r9 @ if virt > start of RAM |
af3e4fd3 MG |
585 | #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH |
586 | orrhs r1, r1, #0x08 @ set cacheable | |
587 | #else | |
1da177e4 | 588 | orrhs r1, r1, #0x0c @ set cacheable, bufferable |
af3e4fd3 | 589 | #endif |
f4619025 | 590 | cmp r1, r10 @ if virt > end of RAM |
1da177e4 LT |
591 | bichs r1, r1, #0x0c @ clear cacheable, bufferable |
592 | str r1, [r0], #4 @ 1:1 mapping | |
593 | add r1, r1, #1048576 | |
594 | teq r0, r2 | |
595 | bne 1b | |
596 | /* | |
597 | * If ever we are running from Flash, then we surely want the cache | |
598 | * to be enabled also for our execution instance... We map 2MB of it | |
599 | * so there is no map overlap problem for up to 1 MB compressed kernel. | |
600 | * If the execution is in RAM then we would only be duplicating the above. | |
601 | */ | |
602 | mov r1, #0x1e | |
603 | orr r1, r1, #3 << 10 | |
bfa64c4a DM |
604 | mov r2, pc |
605 | mov r2, r2, lsr #20 | |
1da177e4 LT |
606 | orr r1, r1, r2, lsl #20 |
607 | add r0, r3, r2, lsl #2 | |
608 | str r1, [r0], #4 | |
609 | add r1, r1, #1048576 | |
610 | str r1, [r0] | |
611 | mov pc, lr | |
93ed3970 | 612 | ENDPROC(__setup_mmu) |
1da177e4 | 613 | |
af3e4fd3 MG |
614 | __arm926ejs_mmu_cache_on: |
615 | #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH | |
616 | mov r0, #4 @ put dcache in WT mode | |
617 | mcr p15, 7, r0, c15, c0, 0 | |
618 | #endif | |
619 | ||
c76b6b41 | 620 | __armv4_mmu_cache_on: |
1da177e4 | 621 | mov r12, lr |
8bdca0ac | 622 | #ifdef CONFIG_MMU |
1da177e4 LT |
623 | bl __setup_mmu |
624 | mov r0, #0 | |
625 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer | |
626 | mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs | |
627 | mrc p15, 0, r0, c1, c0, 0 @ read control reg | |
628 | orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement | |
629 | orr r0, r0, #0x0030 | |
26584853 CM |
630 | #ifdef CONFIG_CPU_ENDIAN_BE8 |
631 | orr r0, r0, #1 << 25 @ big-endian page tables | |
632 | #endif | |
c76b6b41 | 633 | bl __common_mmu_cache_on |
1da177e4 LT |
634 | mov r0, #0 |
635 | mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs | |
8bdca0ac | 636 | #endif |
1da177e4 LT |
637 | mov pc, r12 |
638 | ||
7d09e854 CM |
639 | __armv7_mmu_cache_on: |
640 | mov r12, lr | |
8bdca0ac | 641 | #ifdef CONFIG_MMU |
7d09e854 CM |
642 | mrc p15, 0, r11, c0, c1, 4 @ read ID_MMFR0 |
643 | tst r11, #0xf @ VMSA | |
644 | blne __setup_mmu | |
645 | mov r0, #0 | |
646 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer | |
647 | tst r11, #0xf @ VMSA | |
648 | mcrne p15, 0, r0, c8, c7, 0 @ flush I,D TLBs | |
8bdca0ac | 649 | #endif |
7d09e854 CM |
650 | mrc p15, 0, r0, c1, c0, 0 @ read control reg |
651 | orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement | |
652 | orr r0, r0, #0x003c @ write buffer | |
8bdca0ac | 653 | #ifdef CONFIG_MMU |
26584853 CM |
654 | #ifdef CONFIG_CPU_ENDIAN_BE8 |
655 | orr r0, r0, #1 << 25 @ big-endian page tables | |
656 | #endif | |
7d09e854 CM |
657 | orrne r0, r0, #1 @ MMU enabled |
658 | movne r1, #-1 | |
659 | mcrne p15, 0, r3, c2, c0, 0 @ load page table pointer | |
660 | mcrne p15, 0, r1, c3, c0, 0 @ load domain access control | |
8bdca0ac | 661 | #endif |
d675d0bc | 662 | mcr p15, 0, r0, c7, c5, 4 @ ISB |
7d09e854 CM |
663 | mcr p15, 0, r0, c1, c0, 0 @ load control register |
664 | mrc p15, 0, r0, c1, c0, 0 @ and read it back | |
665 | mov r0, #0 | |
666 | mcr p15, 0, r0, c7, c5, 4 @ ISB | |
667 | mov pc, r12 | |
668 | ||
28853ac8 PZ |
669 | __fa526_cache_on: |
670 | mov r12, lr | |
671 | bl __setup_mmu | |
672 | mov r0, #0 | |
673 | mcr p15, 0, r0, c7, c7, 0 @ Invalidate whole cache | |
674 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer | |
675 | mcr p15, 0, r0, c8, c7, 0 @ flush UTLB | |
676 | mrc p15, 0, r0, c1, c0, 0 @ read control reg | |
677 | orr r0, r0, #0x1000 @ I-cache enable | |
678 | bl __common_mmu_cache_on | |
679 | mov r0, #0 | |
680 | mcr p15, 0, r0, c8, c7, 0 @ flush UTLB | |
681 | mov pc, r12 | |
682 | ||
c76b6b41 | 683 | __arm6_mmu_cache_on: |
1da177e4 LT |
684 | mov r12, lr |
685 | bl __setup_mmu | |
686 | mov r0, #0 | |
687 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 | |
688 | mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3 | |
689 | mov r0, #0x30 | |
c76b6b41 | 690 | bl __common_mmu_cache_on |
1da177e4 LT |
691 | mov r0, #0 |
692 | mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3 | |
693 | mov pc, r12 | |
694 | ||
c76b6b41 | 695 | __common_mmu_cache_on: |
0e056f20 | 696 | #ifndef CONFIG_THUMB2_KERNEL |
1da177e4 LT |
697 | #ifndef DEBUG |
698 | orr r0, r0, #0x000d @ Write buffer, mmu | |
699 | #endif | |
700 | mov r1, #-1 | |
701 | mcr p15, 0, r3, c2, c0, 0 @ load page table pointer | |
702 | mcr p15, 0, r1, c3, c0, 0 @ load domain access control | |
2dc7667b NP |
703 | b 1f |
704 | .align 5 @ cache line aligned | |
705 | 1: mcr p15, 0, r0, c1, c0, 0 @ load control register | |
706 | mrc p15, 0, r0, c1, c0, 0 @ and read it back to | |
707 | sub pc, lr, r0, lsr #32 @ properly flush pipeline | |
0e056f20 | 708 | #endif |
1da177e4 | 709 | |
946a105e DM |
710 | #define PROC_ENTRY_SIZE (4*5) |
711 | ||
1da177e4 LT |
712 | /* |
713 | * Here follow the relocatable cache support functions for the | |
714 | * various processors. This is a generic hook for locating an | |
715 | * entry and jumping to an instruction at the specified offset | |
716 | * from the start of the block. Please note this is all position | |
717 | * independent code. | |
718 | * | |
719 | * r1 = corrupted | |
720 | * r2 = corrupted | |
721 | * r3 = block offset | |
98e12b5a | 722 | * r9 = corrupted |
1da177e4 LT |
723 | * r12 = corrupted |
724 | */ | |
725 | ||
726 | call_cache_fn: adr r12, proc_types | |
f12d0d7c | 727 | #ifdef CONFIG_CPU_CP15 |
98e12b5a | 728 | mrc p15, 0, r9, c0, c0 @ get processor ID |
f12d0d7c | 729 | #else |
98e12b5a | 730 | ldr r9, =CONFIG_PROCESSOR_ID |
f12d0d7c | 731 | #endif |
1da177e4 LT |
732 | 1: ldr r1, [r12, #0] @ get value |
733 | ldr r2, [r12, #4] @ get mask | |
98e12b5a | 734 | eor r1, r1, r9 @ (real ^ match) |
1da177e4 | 735 | tst r1, r2 @ & mask |
0e056f20 CM |
736 | ARM( addeq pc, r12, r3 ) @ call cache function |
737 | THUMB( addeq r12, r3 ) | |
738 | THUMB( moveq pc, r12 ) @ call cache function | |
946a105e | 739 | add r12, r12, #PROC_ENTRY_SIZE |
1da177e4 LT |
740 | b 1b |
741 | ||
742 | /* | |
743 | * Table for cache operations. This is basically: | |
744 | * - CPU ID match | |
745 | * - CPU ID mask | |
746 | * - 'cache on' method instruction | |
747 | * - 'cache off' method instruction | |
748 | * - 'cache flush' method instruction | |
749 | * | |
750 | * We match an entry using: ((real_id ^ match) & mask) == 0 | |
751 | * | |
752 | * Writethrough caches generally only need 'on' and 'off' | |
753 | * methods. Writeback caches _must_ have the flush method | |
754 | * defined. | |
755 | */ | |
88987ef9 | 756 | .align 2 |
1da177e4 LT |
757 | .type proc_types,#object |
758 | proc_types: | |
759 | .word 0x41560600 @ ARM6/610 | |
760 | .word 0xffffffe0 | |
0e056f20 CM |
761 | W(b) __arm6_mmu_cache_off @ works, but slow |
762 | W(b) __arm6_mmu_cache_off | |
1da177e4 | 763 | mov pc, lr |
0e056f20 | 764 | THUMB( nop ) |
c76b6b41 HC |
765 | @ b __arm6_mmu_cache_on @ untested |
766 | @ b __arm6_mmu_cache_off | |
767 | @ b __armv3_mmu_cache_flush | |
1da177e4 LT |
768 | |
769 | .word 0x00000000 @ old ARM ID | |
770 | .word 0x0000f000 | |
771 | mov pc, lr | |
0e056f20 | 772 | THUMB( nop ) |
1da177e4 | 773 | mov pc, lr |
0e056f20 | 774 | THUMB( nop ) |
1da177e4 | 775 | mov pc, lr |
0e056f20 | 776 | THUMB( nop ) |
1da177e4 LT |
777 | |
778 | .word 0x41007000 @ ARM7/710 | |
779 | .word 0xfff8fe00 | |
0e056f20 CM |
780 | W(b) __arm7_mmu_cache_off |
781 | W(b) __arm7_mmu_cache_off | |
1da177e4 | 782 | mov pc, lr |
0e056f20 | 783 | THUMB( nop ) |
1da177e4 LT |
784 | |
785 | .word 0x41807200 @ ARM720T (writethrough) | |
786 | .word 0xffffff00 | |
0e056f20 CM |
787 | W(b) __armv4_mmu_cache_on |
788 | W(b) __armv4_mmu_cache_off | |
1da177e4 | 789 | mov pc, lr |
0e056f20 | 790 | THUMB( nop ) |
1da177e4 | 791 | |
10c2df65 HC |
792 | .word 0x41007400 @ ARM74x |
793 | .word 0xff00ff00 | |
0e056f20 CM |
794 | W(b) __armv3_mpu_cache_on |
795 | W(b) __armv3_mpu_cache_off | |
796 | W(b) __armv3_mpu_cache_flush | |
10c2df65 HC |
797 | |
798 | .word 0x41009400 @ ARM94x | |
799 | .word 0xff00ff00 | |
0e056f20 CM |
800 | W(b) __armv4_mpu_cache_on |
801 | W(b) __armv4_mpu_cache_off | |
802 | W(b) __armv4_mpu_cache_flush | |
10c2df65 | 803 | |
af3e4fd3 MG |
804 | .word 0x41069260 @ ARM926EJ-S (v5TEJ) |
805 | .word 0xff0ffff0 | |
720c60e1 NP |
806 | W(b) __arm926ejs_mmu_cache_on |
807 | W(b) __armv4_mmu_cache_off | |
808 | W(b) __armv5tej_mmu_cache_flush | |
10c2df65 | 809 | |
1da177e4 LT |
810 | .word 0x00007000 @ ARM7 IDs |
811 | .word 0x0000f000 | |
812 | mov pc, lr | |
0e056f20 | 813 | THUMB( nop ) |
1da177e4 | 814 | mov pc, lr |
0e056f20 | 815 | THUMB( nop ) |
1da177e4 | 816 | mov pc, lr |
0e056f20 | 817 | THUMB( nop ) |
1da177e4 LT |
818 | |
819 | @ Everything from here on will be the new ID system. | |
820 | ||
821 | .word 0x4401a100 @ sa110 / sa1100 | |
822 | .word 0xffffffe0 | |
0e056f20 CM |
823 | W(b) __armv4_mmu_cache_on |
824 | W(b) __armv4_mmu_cache_off | |
825 | W(b) __armv4_mmu_cache_flush | |
1da177e4 LT |
826 | |
827 | .word 0x6901b110 @ sa1110 | |
828 | .word 0xfffffff0 | |
0e056f20 CM |
829 | W(b) __armv4_mmu_cache_on |
830 | W(b) __armv4_mmu_cache_off | |
831 | W(b) __armv4_mmu_cache_flush | |
1da177e4 | 832 | |
4157d317 HZ |
833 | .word 0x56056900 |
834 | .word 0xffffff00 @ PXA9xx | |
0e056f20 CM |
835 | W(b) __armv4_mmu_cache_on |
836 | W(b) __armv4_mmu_cache_off | |
837 | W(b) __armv4_mmu_cache_flush | |
49cbe786 EM |
838 | |
839 | .word 0x56158000 @ PXA168 | |
840 | .word 0xfffff000 | |
0e056f20 CM |
841 | W(b) __armv4_mmu_cache_on |
842 | W(b) __armv4_mmu_cache_off | |
843 | W(b) __armv5tej_mmu_cache_flush | |
49cbe786 | 844 | |
2e2023fe NP |
845 | .word 0x56050000 @ Feroceon |
846 | .word 0xff0f0000 | |
0e056f20 CM |
847 | W(b) __armv4_mmu_cache_on |
848 | W(b) __armv4_mmu_cache_off | |
849 | W(b) __armv5tej_mmu_cache_flush | |
3ebb5a2b | 850 | |
5587931c JS |
851 | #ifdef CONFIG_CPU_FEROCEON_OLD_ID |
852 | /* this conflicts with the standard ARMv5TE entry */ | |
853 | .long 0x41009260 @ Old Feroceon | |
854 | .long 0xff00fff0 | |
855 | b __armv4_mmu_cache_on | |
856 | b __armv4_mmu_cache_off | |
857 | b __armv5tej_mmu_cache_flush | |
858 | #endif | |
859 | ||
28853ac8 PZ |
860 | .word 0x66015261 @ FA526 |
861 | .word 0xff01fff1 | |
0e056f20 CM |
862 | W(b) __fa526_cache_on |
863 | W(b) __armv4_mmu_cache_off | |
864 | W(b) __fa526_cache_flush | |
28853ac8 | 865 | |
1da177e4 LT |
866 | @ These match on the architecture ID |
867 | ||
868 | .word 0x00020000 @ ARMv4T | |
869 | .word 0x000f0000 | |
0e056f20 CM |
870 | W(b) __armv4_mmu_cache_on |
871 | W(b) __armv4_mmu_cache_off | |
872 | W(b) __armv4_mmu_cache_flush | |
1da177e4 LT |
873 | |
874 | .word 0x00050000 @ ARMv5TE | |
875 | .word 0x000f0000 | |
0e056f20 CM |
876 | W(b) __armv4_mmu_cache_on |
877 | W(b) __armv4_mmu_cache_off | |
878 | W(b) __armv4_mmu_cache_flush | |
1da177e4 LT |
879 | |
880 | .word 0x00060000 @ ARMv5TEJ | |
881 | .word 0x000f0000 | |
0e056f20 CM |
882 | W(b) __armv4_mmu_cache_on |
883 | W(b) __armv4_mmu_cache_off | |
75216859 | 884 | W(b) __armv5tej_mmu_cache_flush |
1da177e4 | 885 | |
45a7b9cf | 886 | .word 0x0007b000 @ ARMv6 |
7d09e854 | 887 | .word 0x000ff000 |
0e056f20 CM |
888 | W(b) __armv4_mmu_cache_on |
889 | W(b) __armv4_mmu_cache_off | |
890 | W(b) __armv6_mmu_cache_flush | |
1da177e4 | 891 | |
7d09e854 CM |
892 | .word 0x000f0000 @ new CPU Id |
893 | .word 0x000f0000 | |
0e056f20 CM |
894 | W(b) __armv7_mmu_cache_on |
895 | W(b) __armv7_mmu_cache_off | |
896 | W(b) __armv7_mmu_cache_flush | |
7d09e854 | 897 | |
1da177e4 LT |
898 | .word 0 @ unrecognised type |
899 | .word 0 | |
900 | mov pc, lr | |
0e056f20 | 901 | THUMB( nop ) |
1da177e4 | 902 | mov pc, lr |
0e056f20 | 903 | THUMB( nop ) |
1da177e4 | 904 | mov pc, lr |
0e056f20 | 905 | THUMB( nop ) |
1da177e4 LT |
906 | |
907 | .size proc_types, . - proc_types | |
908 | ||
946a105e DM |
909 | /* |
910 | * If you get a "non-constant expression in ".if" statement" | |
911 | * error from the assembler on this line, check that you have | |
912 | * not accidentally written a "b" instruction where you should | |
913 | * have written W(b). | |
914 | */ | |
915 | .if (. - proc_types) % PROC_ENTRY_SIZE != 0 | |
916 | .error "The size of one or more proc_types entries is wrong." | |
917 | .endif | |
918 | ||
1da177e4 LT |
919 | /* |
920 | * Turn off the Cache and MMU. ARMv3 does not support | |
921 | * reading the control register, but ARMv4 does. | |
922 | * | |
21b2841d UKK |
923 | * On exit, |
924 | * r0, r1, r2, r3, r9, r12 corrupted | |
925 | * This routine must preserve: | |
6d7d0ae5 | 926 | * r4, r7, r8 |
1da177e4 LT |
927 | */ |
928 | .align 5 | |
929 | cache_off: mov r3, #12 @ cache_off function | |
930 | b call_cache_fn | |
931 | ||
10c2df65 HC |
932 | __armv4_mpu_cache_off: |
933 | mrc p15, 0, r0, c1, c0 | |
934 | bic r0, r0, #0x000d | |
935 | mcr p15, 0, r0, c1, c0 @ turn MPU and cache off | |
936 | mov r0, #0 | |
937 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer | |
938 | mcr p15, 0, r0, c7, c6, 0 @ flush D-Cache | |
939 | mcr p15, 0, r0, c7, c5, 0 @ flush I-Cache | |
940 | mov pc, lr | |
941 | ||
942 | __armv3_mpu_cache_off: | |
943 | mrc p15, 0, r0, c1, c0 | |
944 | bic r0, r0, #0x000d | |
945 | mcr p15, 0, r0, c1, c0, 0 @ turn MPU and cache off | |
946 | mov r0, #0 | |
947 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 | |
948 | mov pc, lr | |
949 | ||
c76b6b41 | 950 | __armv4_mmu_cache_off: |
8bdca0ac | 951 | #ifdef CONFIG_MMU |
1da177e4 LT |
952 | mrc p15, 0, r0, c1, c0 |
953 | bic r0, r0, #0x000d | |
954 | mcr p15, 0, r0, c1, c0 @ turn MMU and cache off | |
955 | mov r0, #0 | |
956 | mcr p15, 0, r0, c7, c7 @ invalidate whole cache v4 | |
957 | mcr p15, 0, r0, c8, c7 @ invalidate whole TLB v4 | |
8bdca0ac | 958 | #endif |
1da177e4 LT |
959 | mov pc, lr |
960 | ||
7d09e854 CM |
961 | __armv7_mmu_cache_off: |
962 | mrc p15, 0, r0, c1, c0 | |
8bdca0ac | 963 | #ifdef CONFIG_MMU |
7d09e854 | 964 | bic r0, r0, #0x000d |
8bdca0ac CM |
965 | #else |
966 | bic r0, r0, #0x000c | |
967 | #endif | |
7d09e854 CM |
968 | mcr p15, 0, r0, c1, c0 @ turn MMU and cache off |
969 | mov r12, lr | |
970 | bl __armv7_mmu_cache_flush | |
971 | mov r0, #0 | |
8bdca0ac | 972 | #ifdef CONFIG_MMU |
7d09e854 | 973 | mcr p15, 0, r0, c8, c7, 0 @ invalidate whole TLB |
8bdca0ac | 974 | #endif |
c30c2f99 CM |
975 | mcr p15, 0, r0, c7, c5, 6 @ invalidate BTC |
976 | mcr p15, 0, r0, c7, c10, 4 @ DSB | |
977 | mcr p15, 0, r0, c7, c5, 4 @ ISB | |
7d09e854 CM |
978 | mov pc, r12 |
979 | ||
c76b6b41 | 980 | __arm6_mmu_cache_off: |
1da177e4 | 981 | mov r0, #0x00000030 @ ARM6 control reg. |
c76b6b41 | 982 | b __armv3_mmu_cache_off |
1da177e4 | 983 | |
c76b6b41 | 984 | __arm7_mmu_cache_off: |
1da177e4 | 985 | mov r0, #0x00000070 @ ARM7 control reg. |
c76b6b41 | 986 | b __armv3_mmu_cache_off |
1da177e4 | 987 | |
c76b6b41 | 988 | __armv3_mmu_cache_off: |
1da177e4 LT |
989 | mcr p15, 0, r0, c1, c0, 0 @ turn MMU and cache off |
990 | mov r0, #0 | |
991 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 | |
992 | mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3 | |
993 | mov pc, lr | |
994 | ||
995 | /* | |
996 | * Clean and flush the cache to maintain consistency. | |
997 | * | |
1da177e4 | 998 | * On exit, |
21b2841d | 999 | * r1, r2, r3, r9, r10, r11, r12 corrupted |
1da177e4 | 1000 | * This routine must preserve: |
6d7d0ae5 | 1001 | * r4, r6, r7, r8 |
1da177e4 LT |
1002 | */ |
1003 | .align 5 | |
1004 | cache_clean_flush: | |
1005 | mov r3, #16 | |
1006 | b call_cache_fn | |
1007 | ||
10c2df65 HC |
1008 | __armv4_mpu_cache_flush: |
1009 | mov r2, #1 | |
1010 | mov r3, #0 | |
1011 | mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache | |
1012 | mov r1, #7 << 5 @ 8 segments | |
1013 | 1: orr r3, r1, #63 << 26 @ 64 entries | |
1014 | 2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index | |
1015 | subs r3, r3, #1 << 26 | |
1016 | bcs 2b @ entries 63 to 0 | |
1017 | subs r1, r1, #1 << 5 | |
1018 | bcs 1b @ segments 7 to 0 | |
1019 | ||
1020 | teq r2, #0 | |
1021 | mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache | |
1022 | mcr p15, 0, ip, c7, c10, 4 @ drain WB | |
1023 | mov pc, lr | |
1024 | ||
28853ac8 PZ |
1025 | __fa526_cache_flush: |
1026 | mov r1, #0 | |
1027 | mcr p15, 0, r1, c7, c14, 0 @ clean and invalidate D cache | |
1028 | mcr p15, 0, r1, c7, c5, 0 @ flush I cache | |
1029 | mcr p15, 0, r1, c7, c10, 4 @ drain WB | |
1030 | mov pc, lr | |
10c2df65 | 1031 | |
c76b6b41 | 1032 | __armv6_mmu_cache_flush: |
1da177e4 LT |
1033 | mov r1, #0 |
1034 | mcr p15, 0, r1, c7, c14, 0 @ clean+invalidate D | |
1035 | mcr p15, 0, r1, c7, c5, 0 @ invalidate I+BTB | |
1036 | mcr p15, 0, r1, c7, c15, 0 @ clean+invalidate unified | |
1037 | mcr p15, 0, r1, c7, c10, 4 @ drain WB | |
1038 | mov pc, lr | |
1039 | ||
7d09e854 CM |
1040 | __armv7_mmu_cache_flush: |
1041 | mrc p15, 0, r10, c0, c1, 5 @ read ID_MMFR1 | |
1042 | tst r10, #0xf << 16 @ hierarchical cache (ARMv7) | |
7d09e854 | 1043 | mov r10, #0 |
c30c2f99 | 1044 | beq hierarchical |
7d09e854 CM |
1045 | mcr p15, 0, r10, c7, c14, 0 @ clean+invalidate D |
1046 | b iflush | |
1047 | hierarchical: | |
c30c2f99 | 1048 | mcr p15, 0, r10, c7, c10, 5 @ DMB |
0e056f20 | 1049 | stmfd sp!, {r0-r7, r9-r11} |
7d09e854 CM |
1050 | mrc p15, 1, r0, c0, c0, 1 @ read clidr |
1051 | ands r3, r0, #0x7000000 @ extract loc from clidr | |
1052 | mov r3, r3, lsr #23 @ left align loc bit field | |
1053 | beq finished @ if loc is 0, then no need to clean | |
1054 | mov r10, #0 @ start clean at cache level 0 | |
1055 | loop1: | |
1056 | add r2, r10, r10, lsr #1 @ work out 3x current cache level | |
1057 | mov r1, r0, lsr r2 @ extract cache type bits from clidr | |
1058 | and r1, r1, #7 @ mask of the bits for current cache only | |
1059 | cmp r1, #2 @ see what cache we have at this level | |
1060 | blt skip @ skip if no cache, or just i-cache | |
1061 | mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr | |
1062 | mcr p15, 0, r10, c7, c5, 4 @ isb to sych the new cssr&csidr | |
1063 | mrc p15, 1, r1, c0, c0, 0 @ read the new csidr | |
1064 | and r2, r1, #7 @ extract the length of the cache lines | |
1065 | add r2, r2, #4 @ add 4 (line length offset) | |
1066 | ldr r4, =0x3ff | |
1067 | ands r4, r4, r1, lsr #3 @ find maximum number on the way size | |
000b5025 | 1068 | clz r5, r4 @ find bit position of way size increment |
7d09e854 CM |
1069 | ldr r7, =0x7fff |
1070 | ands r7, r7, r1, lsr #13 @ extract max number of the index size | |
1071 | loop2: | |
1072 | mov r9, r4 @ create working copy of max way size | |
1073 | loop3: | |
0e056f20 CM |
1074 | ARM( orr r11, r10, r9, lsl r5 ) @ factor way and cache number into r11 |
1075 | ARM( orr r11, r11, r7, lsl r2 ) @ factor index number into r11 | |
1076 | THUMB( lsl r6, r9, r5 ) | |
1077 | THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11 | |
1078 | THUMB( lsl r6, r7, r2 ) | |
1079 | THUMB( orr r11, r11, r6 ) @ factor index number into r11 | |
7d09e854 CM |
1080 | mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way |
1081 | subs r9, r9, #1 @ decrement the way | |
1082 | bge loop3 | |
1083 | subs r7, r7, #1 @ decrement the index | |
1084 | bge loop2 | |
1085 | skip: | |
1086 | add r10, r10, #2 @ increment cache number | |
1087 | cmp r3, r10 | |
1088 | bgt loop1 | |
1089 | finished: | |
0e056f20 | 1090 | ldmfd sp!, {r0-r7, r9-r11} |
7d09e854 CM |
1091 | mov r10, #0 @ swith back to cache level 0 |
1092 | mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr | |
7d09e854 | 1093 | iflush: |
c30c2f99 | 1094 | mcr p15, 0, r10, c7, c10, 4 @ DSB |
7d09e854 | 1095 | mcr p15, 0, r10, c7, c5, 0 @ invalidate I+BTB |
c30c2f99 CM |
1096 | mcr p15, 0, r10, c7, c10, 4 @ DSB |
1097 | mcr p15, 0, r10, c7, c5, 4 @ ISB | |
7d09e854 CM |
1098 | mov pc, lr |
1099 | ||
15754bf9 NP |
1100 | __armv5tej_mmu_cache_flush: |
1101 | 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate D cache | |
1102 | bne 1b | |
1103 | mcr p15, 0, r0, c7, c5, 0 @ flush I cache | |
1104 | mcr p15, 0, r0, c7, c10, 4 @ drain WB | |
1105 | mov pc, lr | |
1106 | ||
c76b6b41 | 1107 | __armv4_mmu_cache_flush: |
1da177e4 LT |
1108 | mov r2, #64*1024 @ default: 32K dcache size (*2) |
1109 | mov r11, #32 @ default: 32 byte line size | |
1110 | mrc p15, 0, r3, c0, c0, 1 @ read cache type | |
98e12b5a | 1111 | teq r3, r9 @ cache ID register present? |
1da177e4 LT |
1112 | beq no_cache_id |
1113 | mov r1, r3, lsr #18 | |
1114 | and r1, r1, #7 | |
1115 | mov r2, #1024 | |
1116 | mov r2, r2, lsl r1 @ base dcache size *2 | |
1117 | tst r3, #1 << 14 @ test M bit | |
1118 | addne r2, r2, r2, lsr #1 @ +1/2 size if M == 1 | |
1119 | mov r3, r3, lsr #12 | |
1120 | and r3, r3, #3 | |
1121 | mov r11, #8 | |
1122 | mov r11, r11, lsl r3 @ cache line size in bytes | |
1123 | no_cache_id: | |
0e056f20 CM |
1124 | mov r1, pc |
1125 | bic r1, r1, #63 @ align to longest cache line | |
1da177e4 | 1126 | add r2, r1, r2 |
0e056f20 CM |
1127 | 1: |
1128 | ARM( ldr r3, [r1], r11 ) @ s/w flush D cache | |
1129 | THUMB( ldr r3, [r1] ) @ s/w flush D cache | |
1130 | THUMB( add r1, r1, r11 ) | |
1da177e4 LT |
1131 | teq r1, r2 |
1132 | bne 1b | |
1133 | ||
1134 | mcr p15, 0, r1, c7, c5, 0 @ flush I cache | |
1135 | mcr p15, 0, r1, c7, c6, 0 @ flush D cache | |
1136 | mcr p15, 0, r1, c7, c10, 4 @ drain WB | |
1137 | mov pc, lr | |
1138 | ||
c76b6b41 | 1139 | __armv3_mmu_cache_flush: |
10c2df65 | 1140 | __armv3_mpu_cache_flush: |
1da177e4 | 1141 | mov r1, #0 |
63fa7187 | 1142 | mcr p15, 0, r1, c7, c0, 0 @ invalidate whole cache v3 |
1da177e4 LT |
1143 | mov pc, lr |
1144 | ||
1145 | /* | |
1146 | * Various debugging routines for printing hex characters and | |
1147 | * memory, which again must be relocatable. | |
1148 | */ | |
1149 | #ifdef DEBUG | |
88987ef9 | 1150 | .align 2 |
1da177e4 LT |
1151 | .type phexbuf,#object |
1152 | phexbuf: .space 12 | |
1153 | .size phexbuf, . - phexbuf | |
1154 | ||
be6f9f00 | 1155 | @ phex corrupts {r0, r1, r2, r3} |
1da177e4 LT |
1156 | phex: adr r3, phexbuf |
1157 | mov r2, #0 | |
1158 | strb r2, [r3, r1] | |
1159 | 1: subs r1, r1, #1 | |
1160 | movmi r0, r3 | |
1161 | bmi puts | |
1162 | and r2, r0, #15 | |
1163 | mov r0, r0, lsr #4 | |
1164 | cmp r2, #10 | |
1165 | addge r2, r2, #7 | |
1166 | add r2, r2, #'0' | |
1167 | strb r2, [r3, r1] | |
1168 | b 1b | |
1169 | ||
be6f9f00 | 1170 | @ puts corrupts {r0, r1, r2, r3} |
4e6d488a | 1171 | puts: loadsp r3, r1 |
1da177e4 LT |
1172 | 1: ldrb r2, [r0], #1 |
1173 | teq r2, #0 | |
1174 | moveq pc, lr | |
5cd0c344 | 1175 | 2: writeb r2, r3 |
1da177e4 LT |
1176 | mov r1, #0x00020000 |
1177 | 3: subs r1, r1, #1 | |
1178 | bne 3b | |
1179 | teq r2, #'\n' | |
1180 | moveq r2, #'\r' | |
1181 | beq 2b | |
1182 | teq r0, #0 | |
1183 | bne 1b | |
1184 | mov pc, lr | |
be6f9f00 | 1185 | @ putc corrupts {r0, r1, r2, r3} |
1da177e4 LT |
1186 | putc: |
1187 | mov r2, r0 | |
1188 | mov r0, #0 | |
4e6d488a | 1189 | loadsp r3, r1 |
1da177e4 LT |
1190 | b 2b |
1191 | ||
be6f9f00 | 1192 | @ memdump corrupts {r0, r1, r2, r3, r10, r11, r12, lr} |
1da177e4 LT |
1193 | memdump: mov r12, r0 |
1194 | mov r10, lr | |
1195 | mov r11, #0 | |
1196 | 2: mov r0, r11, lsl #2 | |
1197 | add r0, r0, r12 | |
1198 | mov r1, #8 | |
1199 | bl phex | |
1200 | mov r0, #':' | |
1201 | bl putc | |
1202 | 1: mov r0, #' ' | |
1203 | bl putc | |
1204 | ldr r0, [r12, r11, lsl #2] | |
1205 | mov r1, #8 | |
1206 | bl phex | |
1207 | and r0, r11, #7 | |
1208 | teq r0, #3 | |
1209 | moveq r0, #' ' | |
1210 | bleq putc | |
1211 | and r0, r11, #7 | |
1212 | add r11, r11, #1 | |
1213 | teq r0, #7 | |
1214 | bne 1b | |
1215 | mov r0, #'\n' | |
1216 | bl putc | |
1217 | cmp r11, #64 | |
1218 | blt 2b | |
1219 | mov pc, r10 | |
1220 | #endif | |
1221 | ||
92c83ff1 | 1222 | .ltorg |
adcc2591 | 1223 | reloc_code_end: |
1da177e4 LT |
1224 | |
1225 | .align | |
b0c4d4ee | 1226 | .section ".stack", "aw", %nobits |
8d7e4cc2 NP |
1227 | .L_user_stack: .space 4096 |
1228 | .L_user_stack_end: |