| blob | fa6fbf45cf3bda72821506be8f86087b854c4a4b |
1 /*
2 * linux/arch/arm/boot/compressed/head.S
3 *
4 * Copyright (C) 1996-2002 Russell King
5 * Copyright (C) 2004 Hyok S. Choi (MPU support)
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 */
11 #include <linux/linkage.h>
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
22 #if defined(CONFIG_DEBUG_ICEDCC)
24 #ifdef CONFIG_CPU_V6
25 .macro loadsp, rb
26 .endm
27 .macro writeb, ch, rb
28 mcr p14, 0, \ch, c0, c5, 0
29 .endm
30 #elif defined(CONFIG_CPU_XSCALE)
31 .macro loadsp, rb
32 .endm
33 .macro writeb, ch, rb
34 mcr p14, 0, \ch, c8, c0, 0
35 .endm
36 #else
37 .macro loadsp, rb
38 .endm
39 .macro writeb, ch, rb
40 mcr p14, 0, \ch, c1, c0, 0
41 .endm
42 #endif
44 #else
46 #include <mach/debug-macro.S>
48 .macro writeb, ch, rb
49 senduart \ch, \rb
50 .endm
52 #if defined(CONFIG_ARCH_SA1100)
53 .macro loadsp, rb
54 mov \rb, #0x80000000 @ physical base address
55 #ifdef CONFIG_DEBUG_LL_SER3
56 add \rb, \rb, #0x00050000 @ Ser3
57 #else
58 add \rb, \rb, #0x00010000 @ Ser1
59 #endif
60 .endm
61 #elif defined(CONFIG_ARCH_S3C2410)
62 .macro loadsp, rb
63 mov \rb, #0x50000000
64 add \rb, \rb, #0x4000 * CONFIG_S3C_LOWLEVEL_UART_PORT
65 .endm
66 #else
67 .macro loadsp, rb
68 addruart \rb
69 .endm
70 #endif
71 #endif
72 #endif
74 .macro kputc,val
75 mov r0, \val
76 bl putc
77 .endm
79 .macro kphex,val,len
80 mov r0, \val
81 mov r1, #\len
82 bl phex
83 .endm
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 */
91 #ifdef CONFIG_CPU_CP15
92 kputc #':'
93 mrc p15, 0, r0, c1, c0
94 kphex r0, 8 /* control reg */
95 #endif
96 kputc #'\n'
97 kphex r5, 8 /* decompressed kernel start */
98 kputc #'-'
99 kphex r9, 8 /* decompressed kernel end */
100 kputc #'>'
101 kphex r4, 8 /* kernel execution address */
102 kputc #'\n'
103 #endif
104 .endm
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
115 .section ".start", #alloc, #execinstr
116 /*
117 * sort out different calling conventions
118 */
119 .align
120 start:
121 .type start,#function
122 .rept 8
123 mov r0, r0
124 .endr
126 b 1f
127 .word 0x016f2818 @ Magic numbers to help the loader
128 .word start @ absolute load/run zImage address
129 .word _edata @ zImage end address
130 1: mov r7, r1 @ save architecture ID
131 mov r8, r2 @ save atags pointer
133 #ifndef __ARM_ARCH_2__
134 /*
135 * Booting from Angel - need to enter SVC mode and disable
136 * FIQs/IRQs (numeric definitions from angel arm.h source).
137 * We only do this if we were in user mode on entry.
138 */
139 mrs r2, cpsr @ get current mode
140 tst r2, #3 @ not user?
141 bne not_angel
142 mov r0, #0x17 @ angel_SWIreason_EnterSVC
143 ARM( swi 0x123456 ) @ angel_SWI_ARM
144 THUMB( svc 0xab ) @ angel_SWI_THUMB
145 not_angel:
146 mrs r2, cpsr @ turn off interrupts to
147 orr r2, r2, #0xc0 @ prevent angel from running
148 msr cpsr_c, r2
149 #else
150 teqp pc, #0x0c000003 @ turn off interrupts
151 #endif
153 /*
154 * Note that some cache flushing and other stuff may
155 * be needed here - is there an Angel SWI call for this?
156 */
158 /*
159 * some architecture specific code can be inserted
160 * by the linker here, but it should preserve r7, r8, and r9.
161 */
163 .text
164 adr r0, LC0
165 ARM( ldmia r0, {r1, r2, r3, r4, r5, r6, ip, sp} )
166 THUMB( ldmia r0, {r1, r2, r3, r4, r5, r6, ip} )
167 THUMB( ldr sp, [r0, #28] )
168 subs r0, r0, r1 @ calculate the delta offset
170 @ if delta is zero, we are
171 beq not_relocated @ running at the address we
172 @ were linked at.
174 /*
175 * We're running at a different address. We need to fix
176 * up various pointers:
177 * r5 - zImage base address
178 * r6 - GOT start
179 * ip - GOT end
180 */
181 add r5, r5, r0
182 add r6, r6, r0
183 add ip, ip, r0
185 #ifndef CONFIG_ZBOOT_ROM
186 /*
187 * If we're running fully PIC === CONFIG_ZBOOT_ROM = n,
188 * we need to fix up pointers into the BSS region.
189 * r2 - BSS start
190 * r3 - BSS end
191 * sp - stack pointer
192 */
193 add r2, r2, r0
194 add r3, r3, r0
195 add sp, sp, r0
197 /*
198 * Relocate all entries in the GOT table.
199 */
200 1: ldr r1, [r6, #0] @ relocate entries in the GOT
201 add r1, r1, r0 @ table. This fixes up the
202 str r1, [r6], #4 @ C references.
203 cmp r6, ip
204 blo 1b
205 #else
207 /*
208 * Relocate entries in the GOT table. We only relocate
209 * the entries that are outside the (relocated) BSS region.
210 */
211 1: ldr r1, [r6, #0] @ relocate entries in the GOT
212 cmp r1, r2 @ entry < bss_start ||
213 cmphs r3, r1 @ _end < entry
214 addlo r1, r1, r0 @ table. This fixes up the
215 str r1, [r6], #4 @ C references.
216 cmp r6, ip
217 blo 1b
218 #endif
220 not_relocated: mov r0, #0
221 1: str r0, [r2], #4 @ clear bss
222 str r0, [r2], #4
223 str r0, [r2], #4
224 str r0, [r2], #4
225 cmp r2, r3
226 blo 1b
228 /*
229 * The C runtime environment should now be setup
230 * sufficiently. Turn the cache on, set up some
231 * pointers, and start decompressing.
232 */
233 bl cache_on
235 mov r1, sp @ malloc space above stack
236 add r2, sp, #0x10000 @ 64k max
238 /*
239 * Check to see if we will overwrite ourselves.
240 * r4 = final kernel address
241 * r5 = start of this image
242 * r2 = end of malloc space (and therefore this image)
243 * We basically want:
244 * r4 >= r2 -> OK
245 * r4 + image length <= r5 -> OK
246 */
247 cmp r4, r2
248 bhs wont_overwrite
249 sub r3, sp, r5 @ > compressed kernel size
250 add r0, r4, r3, lsl #2 @ allow for 4x expansion
251 cmp r0, r5
252 bls wont_overwrite
254 mov r5, r2 @ decompress after malloc space
255 mov r0, r5
256 mov r3, r7
257 bl decompress_kernel
259 add r0, r0, #127 + 128 @ alignment + stack
260 bic r0, r0, #127 @ align the kernel length
261 /*
262 * r0 = decompressed kernel length
263 * r1-r3 = unused
264 * r4 = kernel execution address
265 * r5 = decompressed kernel start
266 * r6 = processor ID
267 * r7 = architecture ID
268 * r8 = atags pointer
269 * r9-r12,r14 = corrupted
270 */
271 add r1, r5, r0 @ end of decompressed kernel
272 adr r2, reloc_start
273 ldr r3, LC1
274 add r3, r2, r3
275 1: ldmia r2!, {r9 - r12, r14} @ copy relocation code
276 stmia r1!, {r9 - r12, r14}
277 ldmia r2!, {r9 - r12, r14}
278 stmia r1!, {r9 - r12, r14}
279 cmp r2, r3
280 blo 1b
281 mov sp, r1
282 add sp, sp, #128 @ relocate the stack
284 bl cache_clean_flush
285 ARM( add pc, r5, r0 ) @ call relocation code
286 THUMB( add r12, r5, r0 )
287 THUMB( mov pc, r12 ) @ call relocation code
289 /*
290 * We're not in danger of overwriting ourselves. Do this the simple way.
291 *
292 * r4 = kernel execution address
293 * r7 = architecture ID
294 */
295 wont_overwrite: mov r0, r4
296 mov r3, r7
297 bl decompress_kernel
298 b call_kernel
300 .align 2
301 .type LC0, #object
302 LC0: .word LC0 @ r1
303 .word __bss_start @ r2
304 .word _end @ r3
305 .word zreladdr @ r4
306 .word _start @ r5
307 .word _got_start @ r6
308 .word _got_end @ ip
309 .word user_stack+4096 @ sp
310 LC1: .word reloc_end - reloc_start
311 .size LC0, . - LC0
313 #ifdef CONFIG_ARCH_RPC
314 .globl params
315 params: ldr r0, =params_phys
316 mov pc, lr
317 .ltorg
318 .align
319 #endif
321 /*
322 * Turn on the cache. We need to setup some page tables so that we
323 * can have both the I and D caches on.
324 *
325 * We place the page tables 16k down from the kernel execution address,
326 * and we hope that nothing else is using it. If we're using it, we
327 * will go pop!
328 *
329 * On entry,
330 * r4 = kernel execution address
331 * r6 = processor ID
332 * r7 = architecture number
333 * r8 = atags pointer
334 * r9 = run-time address of "start" (???)
335 * On exit,
336 * r1, r2, r3, r9, r10, r12 corrupted
337 * This routine must preserve:
338 * r4, r5, r6, r7, r8
339 */
340 .align 5
341 cache_on: mov r3, #8 @ cache_on function
342 b call_cache_fn
344 /*
345 * Initialize the highest priority protection region, PR7
346 * to cover all 32bit address and cacheable and bufferable.
347 */
348 __armv4_mpu_cache_on:
349 mov r0, #0x3f @ 4G, the whole
350 mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting
351 mcr p15, 0, r0, c6, c7, 1
353 mov r0, #0x80 @ PR7
354 mcr p15, 0, r0, c2, c0, 0 @ D-cache on
355 mcr p15, 0, r0, c2, c0, 1 @ I-cache on
356 mcr p15, 0, r0, c3, c0, 0 @ write-buffer on
358 mov r0, #0xc000
359 mcr p15, 0, r0, c5, c0, 1 @ I-access permission
360 mcr p15, 0, r0, c5, c0, 0 @ D-access permission
362 mov r0, #0
363 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
364 mcr p15, 0, r0, c7, c5, 0 @ flush(inval) I-Cache
365 mcr p15, 0, r0, c7, c6, 0 @ flush(inval) D-Cache
366 mrc p15, 0, r0, c1, c0, 0 @ read control reg
367 @ ...I .... ..D. WC.M
368 orr r0, r0, #0x002d @ .... .... ..1. 11.1
369 orr r0, r0, #0x1000 @ ...1 .... .... ....
371 mcr p15, 0, r0, c1, c0, 0 @ write control reg
373 mov r0, #0
374 mcr p15, 0, r0, c7, c5, 0 @ flush(inval) I-Cache
375 mcr p15, 0, r0, c7, c6, 0 @ flush(inval) D-Cache
376 mov pc, lr
378 __armv3_mpu_cache_on:
379 mov r0, #0x3f @ 4G, the whole
380 mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting
382 mov r0, #0x80 @ PR7
383 mcr p15, 0, r0, c2, c0, 0 @ cache on
384 mcr p15, 0, r0, c3, c0, 0 @ write-buffer on
386 mov r0, #0xc000
387 mcr p15, 0, r0, c5, c0, 0 @ access permission
389 mov r0, #0
390 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
391 mrc p15, 0, r0, c1, c0, 0 @ read control reg
392 @ .... .... .... WC.M
393 orr r0, r0, #0x000d @ .... .... .... 11.1
394 mov r0, #0
395 mcr p15, 0, r0, c1, c0, 0 @ write control reg
397 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
398 mov pc, lr
400 __setup_mmu: sub r3, r4, #16384 @ Page directory size
401 bic r3, r3, #0xff @ Align the pointer
402 bic r3, r3, #0x3f00
403 /*
404 * Initialise the page tables, turning on the cacheable and bufferable
405 * bits for the RAM area only.
406 */
407 mov r0, r3
408 mov r9, r0, lsr #18
409 mov r9, r9, lsl #18 @ start of RAM
410 add r10, r9, #0x10000000 @ a reasonable RAM size
411 mov r1, #0x12
412 orr r1, r1, #3 << 10
413 add r2, r3, #16384
414 1: cmp r1, r9 @ if virt > start of RAM
415 orrhs r1, r1, #0x0c @ set cacheable, bufferable
416 cmp r1, r10 @ if virt > end of RAM
417 bichs r1, r1, #0x0c @ clear cacheable, bufferable
418 str r1, [r0], #4 @ 1:1 mapping
419 add r1, r1, #1048576
420 teq r0, r2
421 bne 1b
422 /*
423 * If ever we are running from Flash, then we surely want the cache
424 * to be enabled also for our execution instance... We map 2MB of it
425 * so there is no map overlap problem for up to 1 MB compressed kernel.
426 * If the execution is in RAM then we would only be duplicating the above.
427 */
428 mov r1, #0x1e
429 orr r1, r1, #3 << 10
430 mov r2, pc, lsr #20
431 orr r1, r1, r2, lsl #20
432 add r0, r3, r2, lsl #2
433 str r1, [r0], #4
434 add r1, r1, #1048576
435 str r1, [r0]
436 mov pc, lr
437 ENDPROC(__setup_mmu)
439 __armv4_mmu_cache_on:
440 mov r12, lr
441 #ifdef CONFIG_MMU
442 bl __setup_mmu
443 mov r0, #0
444 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
445 mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
446 mrc p15, 0, r0, c1, c0, 0 @ read control reg
447 orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement
448 orr r0, r0, #0x0030
449 #ifdef CONFIG_CPU_ENDIAN_BE8
450 orr r0, r0, #1 << 25 @ big-endian page tables
451 #endif
452 bl __common_mmu_cache_on
453 mov r0, #0
454 mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
455 #endif
456 mov pc, r12
458 __armv7_mmu_cache_on:
459 mov r12, lr
460 #ifdef CONFIG_MMU
461 mrc p15, 0, r11, c0, c1, 4 @ read ID_MMFR0
462 tst r11, #0xf @ VMSA
463 blne __setup_mmu
464 mov r0, #0
465 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
466 tst r11, #0xf @ VMSA
467 mcrne p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
468 #endif
469 mrc p15, 0, r0, c1, c0, 0 @ read control reg
470 orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement
471 orr r0, r0, #0x003c @ write buffer
472 #ifdef CONFIG_MMU
473 #ifdef CONFIG_CPU_ENDIAN_BE8
474 orr r0, r0, #1 << 25 @ big-endian page tables
475 #endif
476 orrne r0, r0, #1 @ MMU enabled
477 movne r1, #-1
478 mcrne p15, 0, r3, c2, c0, 0 @ load page table pointer
479 mcrne p15, 0, r1, c3, c0, 0 @ load domain access control
480 #endif
481 mcr p15, 0, r0, c1, c0, 0 @ load control register
482 mrc p15, 0, r0, c1, c0, 0 @ and read it back
483 mov r0, #0
484 mcr p15, 0, r0, c7, c5, 4 @ ISB
485 mov pc, r12
487 __fa526_cache_on:
488 mov r12, lr
489 bl __setup_mmu
490 mov r0, #0
491 mcr p15, 0, r0, c7, c7, 0 @ Invalidate whole cache
492 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
493 mcr p15, 0, r0, c8, c7, 0 @ flush UTLB
494 mrc p15, 0, r0, c1, c0, 0 @ read control reg
495 orr r0, r0, #0x1000 @ I-cache enable
496 bl __common_mmu_cache_on
497 mov r0, #0
498 mcr p15, 0, r0, c8, c7, 0 @ flush UTLB
499 mov pc, r12
501 __arm6_mmu_cache_on:
502 mov r12, lr
503 bl __setup_mmu
504 mov r0, #0
505 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
506 mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3
507 mov r0, #0x30
508 bl __common_mmu_cache_on
509 mov r0, #0
510 mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3
511 mov pc, r12
513 __common_mmu_cache_on:
514 #ifndef CONFIG_THUMB2_KERNEL
515 #ifndef DEBUG
516 orr r0, r0, #0x000d @ Write buffer, mmu
517 #endif
518 mov r1, #-1
519 mcr p15, 0, r3, c2, c0, 0 @ load page table pointer
520 mcr p15, 0, r1, c3, c0, 0 @ load domain access control
521 b 1f
522 .align 5 @ cache line aligned
523 1: mcr p15, 0, r0, c1, c0, 0 @ load control register
524 mrc p15, 0, r0, c1, c0, 0 @ and read it back to
525 sub pc, lr, r0, lsr #32 @ properly flush pipeline
526 #endif
528 /*
529 * All code following this line is relocatable. It is relocated by
530 * the above code to the end of the decompressed kernel image and
531 * executed there. During this time, we have no stacks.
532 *
533 * r0 = decompressed kernel length
534 * r1-r3 = unused
535 * r4 = kernel execution address
536 * r5 = decompressed kernel start
537 * r6 = processor ID
538 * r7 = architecture ID
539 * r8 = atags pointer
540 * r9-r12,r14 = corrupted
541 */
542 .align 5
543 reloc_start: add r9, r5, r0
544 sub r9, r9, #128 @ do not copy the stack
545 debug_reloc_start
546 mov r1, r4
547 1:
548 .rept 4
549 ldmia r5!, {r0, r2, r3, r10 - r12, r14} @ relocate kernel
550 stmia r1!, {r0, r2, r3, r10 - r12, r14}
551 .endr
553 cmp r5, r9
554 blo 1b
555 mov sp, r1
556 add sp, sp, #128 @ relocate the stack
557 debug_reloc_end
559 call_kernel: bl cache_clean_flush
560 bl cache_off
561 mov r0, #0 @ must be zero
562 mov r1, r7 @ restore architecture number
563 mov r2, r8 @ restore atags pointer
564 mov pc, r4 @ call kernel
566 /*
567 * Here follow the relocatable cache support functions for the
568 * various processors. This is a generic hook for locating an
569 * entry and jumping to an instruction at the specified offset
570 * from the start of the block. Please note this is all position
571 * independent code.
572 *
573 * r1 = corrupted
574 * r2 = corrupted
575 * r3 = block offset
576 * r6 = corrupted
577 * r12 = corrupted
578 */
580 call_cache_fn: adr r12, proc_types
581 #ifdef CONFIG_CPU_CP15
582 mrc p15, 0, r6, c0, c0 @ get processor ID
583 #else
584 ldr r6, =CONFIG_PROCESSOR_ID
585 #endif
586 1: ldr r1, [r12, #0] @ get value
587 ldr r2, [r12, #4] @ get mask
588 eor r1, r1, r6 @ (real ^ match)
589 tst r1, r2 @ & mask
590 ARM( addeq pc, r12, r3 ) @ call cache function
591 THUMB( addeq r12, r3 )
592 THUMB( moveq pc, r12 ) @ call cache function
593 add r12, r12, #4*5
594 b 1b
596 /*
597 * Table for cache operations. This is basically:
598 * - CPU ID match
599 * - CPU ID mask
600 * - 'cache on' method instruction
601 * - 'cache off' method instruction
602 * - 'cache flush' method instruction
603 *
604 * We match an entry using: ((real_id ^ match) & mask) == 0
605 *
606 * Writethrough caches generally only need 'on' and 'off'
607 * methods. Writeback caches _must_ have the flush method
608 * defined.
609 */
610 .align 2
611 .type proc_types,#object
612 proc_types:
613 .word 0x41560600 @ ARM6/610
614 .word 0xffffffe0
615 W(b) __arm6_mmu_cache_off @ works, but slow
616 W(b) __arm6_mmu_cache_off
617 mov pc, lr
618 THUMB( nop )
619 @ b __arm6_mmu_cache_on @ untested
620 @ b __arm6_mmu_cache_off
621 @ b __armv3_mmu_cache_flush
623 .word 0x00000000 @ old ARM ID
624 .word 0x0000f000
625 mov pc, lr
626 THUMB( nop )
627 mov pc, lr
628 THUMB( nop )
629 mov pc, lr
630 THUMB( nop )
632 .word 0x41007000 @ ARM7/710
633 .word 0xfff8fe00
634 W(b) __arm7_mmu_cache_off
635 W(b) __arm7_mmu_cache_off
636 mov pc, lr
637 THUMB( nop )
639 .word 0x41807200 @ ARM720T (writethrough)
640 .word 0xffffff00
641 W(b) __armv4_mmu_cache_on
642 W(b) __armv4_mmu_cache_off
643 mov pc, lr
644 THUMB( nop )
646 .word 0x41007400 @ ARM74x
647 .word 0xff00ff00
648 W(b) __armv3_mpu_cache_on
649 W(b) __armv3_mpu_cache_off
650 W(b) __armv3_mpu_cache_flush
652 .word 0x41009400 @ ARM94x
653 .word 0xff00ff00
654 W(b) __armv4_mpu_cache_on
655 W(b) __armv4_mpu_cache_off
656 W(b) __armv4_mpu_cache_flush
658 .word 0x00007000 @ ARM7 IDs
659 .word 0x0000f000
660 mov pc, lr
661 THUMB( nop )
662 mov pc, lr
663 THUMB( nop )
664 mov pc, lr
665 THUMB( nop )
667 @ Everything from here on will be the new ID system.
669 .word 0x4401a100 @ sa110 / sa1100
670 .word 0xffffffe0
671 W(b) __armv4_mmu_cache_on
672 W(b) __armv4_mmu_cache_off
673 W(b) __armv4_mmu_cache_flush
675 .word 0x6901b110 @ sa1110
676 .word 0xfffffff0
677 W(b) __armv4_mmu_cache_on
678 W(b) __armv4_mmu_cache_off
679 W(b) __armv4_mmu_cache_flush
681 .word 0x56056930
682 .word 0xff0ffff0 @ PXA935
683 W(b) __armv4_mmu_cache_on
684 W(b) __armv4_mmu_cache_off
685 W(b) __armv4_mmu_cache_flush
687 .word 0x56158000 @ PXA168
688 .word 0xfffff000
689 W(b) __armv4_mmu_cache_on
690 W(b) __armv4_mmu_cache_off
691 W(b) __armv5tej_mmu_cache_flush
693 .word 0x56056930
694 .word 0xff0ffff0 @ PXA935
695 W(b) __armv4_mmu_cache_on
696 W(b) __armv4_mmu_cache_off
697 W(b) __armv4_mmu_cache_flush
699 .word 0x56050000 @ Feroceon
700 .word 0xff0f0000
701 W(b) __armv4_mmu_cache_on
702 W(b) __armv4_mmu_cache_off
703 W(b) __armv5tej_mmu_cache_flush
705 #ifdef CONFIG_CPU_FEROCEON_OLD_ID
706 /* this conflicts with the standard ARMv5TE entry */
707 .long 0x41009260 @ Old Feroceon
708 .long 0xff00fff0
709 b __armv4_mmu_cache_on
710 b __armv4_mmu_cache_off
711 b __armv5tej_mmu_cache_flush
712 #endif
714 .word 0x66015261 @ FA526
715 .word 0xff01fff1
716 W(b) __fa526_cache_on
717 W(b) __armv4_mmu_cache_off
718 W(b) __fa526_cache_flush
720 @ These match on the architecture ID
722 .word 0x00020000 @ ARMv4T
723 .word 0x000f0000
724 W(b) __armv4_mmu_cache_on
725 W(b) __armv4_mmu_cache_off
726 W(b) __armv4_mmu_cache_flush
728 .word 0x00050000 @ ARMv5TE
729 .word 0x000f0000
730 W(b) __armv4_mmu_cache_on
731 W(b) __armv4_mmu_cache_off
732 W(b) __armv4_mmu_cache_flush
734 .word 0x00060000 @ ARMv5TEJ
735 .word 0x000f0000
736 W(b) __armv4_mmu_cache_on
737 W(b) __armv4_mmu_cache_off
738 W(b) __armv4_mmu_cache_flush
740 .word 0x0007b000 @ ARMv6
741 .word 0x000ff000
742 W(b) __armv4_mmu_cache_on
743 W(b) __armv4_mmu_cache_off
744 W(b) __armv6_mmu_cache_flush
746 .word 0x000f0000 @ new CPU Id
747 .word 0x000f0000
748 W(b) __armv7_mmu_cache_on
749 W(b) __armv7_mmu_cache_off
750 W(b) __armv7_mmu_cache_flush
752 .word 0 @ unrecognised type
753 .word 0
754 mov pc, lr
755 THUMB( nop )
756 mov pc, lr
757 THUMB( nop )
758 mov pc, lr
759 THUMB( nop )
761 .size proc_types, . - proc_types
763 /*
764 * Turn off the Cache and MMU. ARMv3 does not support
765 * reading the control register, but ARMv4 does.
766 *
767 * On entry, r6 = processor ID
768 * On exit, r0, r1, r2, r3, r12 corrupted
769 * This routine must preserve: r4, r6, r7
770 */
771 .align 5
772 cache_off: mov r3, #12 @ cache_off function
773 b call_cache_fn
775 __armv4_mpu_cache_off:
776 mrc p15, 0, r0, c1, c0
777 bic r0, r0, #0x000d
778 mcr p15, 0, r0, c1, c0 @ turn MPU and cache off
779 mov r0, #0
780 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
781 mcr p15, 0, r0, c7, c6, 0 @ flush D-Cache
782 mcr p15, 0, r0, c7, c5, 0 @ flush I-Cache
783 mov pc, lr
785 __armv3_mpu_cache_off:
786 mrc p15, 0, r0, c1, c0
787 bic r0, r0, #0x000d
788 mcr p15, 0, r0, c1, c0, 0 @ turn MPU and cache off
789 mov r0, #0
790 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
791 mov pc, lr
793 __armv4_mmu_cache_off:
794 #ifdef CONFIG_MMU
795 mrc p15, 0, r0, c1, c0
796 bic r0, r0, #0x000d
797 mcr p15, 0, r0, c1, c0 @ turn MMU and cache off
798 mov r0, #0
799 mcr p15, 0, r0, c7, c7 @ invalidate whole cache v4
800 mcr p15, 0, r0, c8, c7 @ invalidate whole TLB v4
801 #endif
802 mov pc, lr
804 __armv7_mmu_cache_off:
805 mrc p15, 0, r0, c1, c0
806 #ifdef CONFIG_MMU
807 bic r0, r0, #0x000d
808 #else
809 bic r0, r0, #0x000c
810 #endif
811 mcr p15, 0, r0, c1, c0 @ turn MMU and cache off
812 mov r12, lr
813 bl __armv7_mmu_cache_flush
814 mov r0, #0
815 #ifdef CONFIG_MMU
816 mcr p15, 0, r0, c8, c7, 0 @ invalidate whole TLB
817 #endif
818 mcr p15, 0, r0, c7, c5, 6 @ invalidate BTC
819 mcr p15, 0, r0, c7, c10, 4 @ DSB
820 mcr p15, 0, r0, c7, c5, 4 @ ISB
821 mov pc, r12
823 __arm6_mmu_cache_off:
824 mov r0, #0x00000030 @ ARM6 control reg.
825 b __armv3_mmu_cache_off
827 __arm7_mmu_cache_off:
828 mov r0, #0x00000070 @ ARM7 control reg.
829 b __armv3_mmu_cache_off
831 __armv3_mmu_cache_off:
832 mcr p15, 0, r0, c1, c0, 0 @ turn MMU and cache off
833 mov r0, #0
834 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
835 mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3
836 mov pc, lr
838 /*
839 * Clean and flush the cache to maintain consistency.
840 *
841 * On entry,
842 * r6 = processor ID
843 * On exit,
844 * r1, r2, r3, r11, r12 corrupted
845 * This routine must preserve:
846 * r0, r4, r5, r6, r7
847 */
848 .align 5
849 cache_clean_flush:
850 mov r3, #16
851 b call_cache_fn
853 __armv4_mpu_cache_flush:
854 mov r2, #1
855 mov r3, #0
856 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
857 mov r1, #7 << 5 @ 8 segments
858 1: orr r3, r1, #63 << 26 @ 64 entries
859 2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
860 subs r3, r3, #1 << 26
861 bcs 2b @ entries 63 to 0
862 subs r1, r1, #1 << 5
863 bcs 1b @ segments 7 to 0
865 teq r2, #0
866 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
867 mcr p15, 0, ip, c7, c10, 4 @ drain WB
868 mov pc, lr
870 __fa526_cache_flush:
871 mov r1, #0
872 mcr p15, 0, r1, c7, c14, 0 @ clean and invalidate D cache
873 mcr p15, 0, r1, c7, c5, 0 @ flush I cache
874 mcr p15, 0, r1, c7, c10, 4 @ drain WB
875 mov pc, lr
877 __armv6_mmu_cache_flush:
878 mov r1, #0
879 mcr p15, 0, r1, c7, c14, 0 @ clean+invalidate D
880 mcr p15, 0, r1, c7, c5, 0 @ invalidate I+BTB
881 mcr p15, 0, r1, c7, c15, 0 @ clean+invalidate unified
882 mcr p15, 0, r1, c7, c10, 4 @ drain WB
883 mov pc, lr
885 __armv7_mmu_cache_flush:
886 mrc p15, 0, r10, c0, c1, 5 @ read ID_MMFR1
887 tst r10, #0xf << 16 @ hierarchical cache (ARMv7)
888 mov r10, #0
889 beq hierarchical
890 mcr p15, 0, r10, c7, c14, 0 @ clean+invalidate D
891 b iflush
892 hierarchical:
893 mcr p15, 0, r10, c7, c10, 5 @ DMB
894 stmfd sp!, {r0-r7, r9-r11}
895 mrc p15, 1, r0, c0, c0, 1 @ read clidr
896 ands r3, r0, #0x7000000 @ extract loc from clidr
897 mov r3, r3, lsr #23 @ left align loc bit field
898 beq finished @ if loc is 0, then no need to clean
899 mov r10, #0 @ start clean at cache level 0
900 loop1:
901 add r2, r10, r10, lsr #1 @ work out 3x current cache level
902 mov r1, r0, lsr r2 @ extract cache type bits from clidr
903 and r1, r1, #7 @ mask of the bits for current cache only
904 cmp r1, #2 @ see what cache we have at this level
905 blt skip @ skip if no cache, or just i-cache
906 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
907 mcr p15, 0, r10, c7, c5, 4 @ isb to sych the new cssr&csidr
908 mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
909 and r2, r1, #7 @ extract the length of the cache lines
910 add r2, r2, #4 @ add 4 (line length offset)
911 ldr r4, =0x3ff
912 ands r4, r4, r1, lsr #3 @ find maximum number on the way size
913 clz r5, r4 @ find bit position of way size increment
914 ldr r7, =0x7fff
915 ands r7, r7, r1, lsr #13 @ extract max number of the index size
916 loop2:
917 mov r9, r4 @ create working copy of max way size
918 loop3:
919 ARM( orr r11, r10, r9, lsl r5 ) @ factor way and cache number into r11
920 ARM( orr r11, r11, r7, lsl r2 ) @ factor index number into r11
921 THUMB( lsl r6, r9, r5 )
922 THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11
923 THUMB( lsl r6, r7, r2 )
924 THUMB( orr r11, r11, r6 ) @ factor index number into r11
925 mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
926 subs r9, r9, #1 @ decrement the way
927 bge loop3
928 subs r7, r7, #1 @ decrement the index
929 bge loop2
930 skip:
931 add r10, r10, #2 @ increment cache number
932 cmp r3, r10
933 bgt loop1
934 finished:
935 ldmfd sp!, {r0-r7, r9-r11}
936 mov r10, #0 @ swith back to cache level 0
937 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
938 iflush:
939 mcr p15, 0, r10, c7, c10, 4 @ DSB
940 mcr p15, 0, r10, c7, c5, 0 @ invalidate I+BTB
941 mcr p15, 0, r10, c7, c10, 4 @ DSB
942 mcr p15, 0, r10, c7, c5, 4 @ ISB
943 mov pc, lr
945 __armv5tej_mmu_cache_flush:
946 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate D cache
947 bne 1b
948 mcr p15, 0, r0, c7, c5, 0 @ flush I cache
949 mcr p15, 0, r0, c7, c10, 4 @ drain WB
950 mov pc, lr
952 __armv4_mmu_cache_flush:
953 mov r2, #64*1024 @ default: 32K dcache size (*2)
954 mov r11, #32 @ default: 32 byte line size
955 mrc p15, 0, r3, c0, c0, 1 @ read cache type
956 teq r3, r6 @ cache ID register present?
957 beq no_cache_id
958 mov r1, r3, lsr #18
959 and r1, r1, #7
960 mov r2, #1024
961 mov r2, r2, lsl r1 @ base dcache size *2
962 tst r3, #1 << 14 @ test M bit
963 addne r2, r2, r2, lsr #1 @ +1/2 size if M == 1
964 mov r3, r3, lsr #12
965 and r3, r3, #3
966 mov r11, #8
967 mov r11, r11, lsl r3 @ cache line size in bytes
968 no_cache_id:
969 mov r1, pc
970 bic r1, r1, #63 @ align to longest cache line
971 add r2, r1, r2
972 1:
973 ARM( ldr r3, [r1], r11 ) @ s/w flush D cache
974 THUMB( ldr r3, [r1] ) @ s/w flush D cache
975 THUMB( add r1, r1, r11 )
976 teq r1, r2
977 bne 1b
979 mcr p15, 0, r1, c7, c5, 0 @ flush I cache
980 mcr p15, 0, r1, c7, c6, 0 @ flush D cache
981 mcr p15, 0, r1, c7, c10, 4 @ drain WB
982 mov pc, lr
984 __armv3_mmu_cache_flush:
985 __armv3_mpu_cache_flush:
986 mov r1, #0
987 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
988 mov pc, lr
990 /*
991 * Various debugging routines for printing hex characters and
992 * memory, which again must be relocatable.
993 */
994 #ifdef DEBUG
995 .align 2
996 .type phexbuf,#object
997 phexbuf: .space 12
998 .size phexbuf, . - phexbuf
1000 phex: adr r3, phexbuf
1001 mov r2, #0
1002 strb r2, [r3, r1]
1003 1: subs r1, r1, #1
1004 movmi r0, r3
1005 bmi puts
1006 and r2, r0, #15
1007 mov r0, r0, lsr #4
1008 cmp r2, #10
1009 addge r2, r2, #7
1010 add r2, r2, #'0'
1011 strb r2, [r3, r1]
1012 b 1b
1014 puts: loadsp r3
1015 1: ldrb r2, [r0], #1
1016 teq r2, #0
1017 moveq pc, lr
1018 2: writeb r2, r3
1019 mov r1, #0x00020000
1020 3: subs r1, r1, #1
1021 bne 3b
1022 teq r2, #'\n'
1023 moveq r2, #'\r'
1024 beq 2b
1025 teq r0, #0
1026 bne 1b
1027 mov pc, lr
1028 putc:
1029 mov r2, r0
1030 mov r0, #0
1031 loadsp r3
1032 b 2b
1034 memdump: mov r12, r0
1035 mov r10, lr
1036 mov r11, #0
1037 2: mov r0, r11, lsl #2
1038 add r0, r0, r12
1039 mov r1, #8
1040 bl phex
1041 mov r0, #':'
1042 bl putc
1043 1: mov r0, #' '
1044 bl putc
1045 ldr r0, [r12, r11, lsl #2]
1046 mov r1, #8
1047 bl phex
1048 and r0, r11, #7
1049 teq r0, #3
1050 moveq r0, #' '
1051 bleq putc
1052 and r0, r11, #7
1053 add r11, r11, #1
1054 teq r0, #7
1055 bne 1b
1056 mov r0, #'\n'
1057 bl putc
1058 cmp r11, #64
1059 blt 2b
1060 mov pc, r10
1061 #endif
1063 .ltorg
1064 reloc_end:
1066 .align
1067 .section ".stack", "w"
1068 user_stack: .space 4096