2 * linux/arch/arm/boot/compressed/head.S
4 * Copyright (C) 1996-2002 Russell King
5 * Copyright (C) 2004 Hyok S. Choi (MPU support)
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.
11 #include <linux/linkage.h>
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.
22 #if defined(CONFIG_DEBUG_ICEDCC)
25 .macro loadsp, rb, tmp
28 mcr p14, 0, \ch, c0, c5, 0
30 #elif defined(CONFIG_CPU_V7)
31 .macro loadsp, rb, tmp
34 wait: mrc p14, 0, pc, c0, c1, 0
36 mcr p14, 0, \ch, c0, c5, 0
38 #elif defined(CONFIG_CPU_XSCALE)
39 .macro loadsp, rb, tmp
42 mcr p14, 0, \ch, c8, c0, 0
45 .macro loadsp, rb, tmp
48 mcr p14, 0, \ch, c1, c0, 0
54 #include <mach/debug-macro.S>
60 #if defined(CONFIG_ARCH_SA1100)
61 .macro loadsp, rb, tmp
62 mov \rb, #0x80000000 @ physical base address
63 #ifdef CONFIG_DEBUG_LL_SER3
64 add \rb, \rb, #0x00050000 @ Ser3
66 add \rb, \rb, #0x00010000 @ Ser1
69 #elif defined(CONFIG_ARCH_S3C2410)
70 .macro loadsp, rb, tmp
72 add \rb, \rb, #0x4000 * CONFIG_S3C_LOWLEVEL_UART_PORT
75 .macro loadsp, rb, tmp
93 .macro debug_reloc_start
96 kphex r6, 8 /* processor id */
98 kphex r7, 8 /* architecture id */
99 #ifdef CONFIG_CPU_CP15
101 mrc p15, 0, r0, c1, c0
102 kphex r0, 8 /* control reg */
105 kphex r5, 8 /* decompressed kernel start */
107 kphex r9, 8 /* decompressed kernel end */
109 kphex r4, 8 /* kernel execution address */
114 .macro debug_reloc_end
116 kphex r5, 8 /* end of kernel */
119 bl memdump /* dump 256 bytes at start of kernel */
123 .section ".start", #alloc, #execinstr
125 * sort out different calling conventions
129 .type start,#function
135 .word 0x016f2818 @ Magic numbers to help the loader
136 .word start @ absolute load/run zImage address
137 .word _edata @ zImage end address
138 1: mov r7, r1 @ save architecture ID
139 mov r8, r2 @ save atags pointer
141 #ifndef __ARM_ARCH_2__
143 * Booting from Angel - need to enter SVC mode and disable
144 * FIQs/IRQs (numeric definitions from angel arm.h source).
145 * We only do this if we were in user mode on entry.
147 mrs r2, cpsr @ get current mode
148 tst r2, #3 @ not user?
150 mov r0, #0x17 @ angel_SWIreason_EnterSVC
151 ARM( swi 0x123456 ) @ angel_SWI_ARM
152 THUMB( svc 0xab ) @ angel_SWI_THUMB
154 mrs r2, cpsr @ turn off interrupts to
155 orr r2, r2, #0xc0 @ prevent angel from running
158 teqp pc, #0x0c000003 @ turn off interrupts
162 * Note that some cache flushing and other stuff may
163 * be needed here - is there an Angel SWI call for this?
167 * some architecture specific code can be inserted
168 * by the linker here, but it should preserve r7, r8, and r9.
173 ldmia r0, {r1, r2, r3, r5, r6, r11, ip}
175 #ifdef CONFIG_AUTO_ZRELADDR
176 @ determine final kernel image address
177 and r4, pc, #0xf8000000
178 add r4, r4, #TEXT_OFFSET
182 subs r0, r0, r1 @ calculate the delta offset
184 @ if delta is zero, we are
185 beq not_relocated @ running at the address we
189 * We're running at a different address. We need to fix
190 * up various pointers:
191 * r5 - zImage base address (_start)
192 * r6 - size of decompressed image
200 #ifndef CONFIG_ZBOOT_ROM
202 * If we're running fully PIC === CONFIG_ZBOOT_ROM = n,
203 * we need to fix up pointers into the BSS region.
213 * Relocate all entries in the GOT table.
215 1: ldr r1, [r11, #0] @ relocate entries in the GOT
216 add r1, r1, r0 @ table. This fixes up the
217 str r1, [r11], #4 @ C references.
223 * Relocate entries in the GOT table. We only relocate
224 * the entries that are outside the (relocated) BSS region.
226 1: ldr r1, [r11, #0] @ relocate entries in the GOT
227 cmp r1, r2 @ entry < bss_start ||
228 cmphs r3, r1 @ _end < entry
229 addlo r1, r1, r0 @ table. This fixes up the
230 str r1, [r11], #4 @ C references.
235 not_relocated: mov r0, #0
236 1: str r0, [r2], #4 @ clear bss
244 * The C runtime environment should now be setup
245 * sufficiently. Turn the cache on, set up some
246 * pointers, and start decompressing.
250 mov r1, sp @ malloc space above stack
251 add r2, sp, #0x10000 @ 64k max
254 * Check to see if we will overwrite ourselves.
255 * r4 = final kernel address
256 * r5 = start of this image
257 * r6 = size of decompressed image
258 * r2 = end of malloc space (and therefore this image)
261 * r4 + image length <= r5 -> OK
269 mov r5, r2 @ decompress after malloc space
274 add r0, r0, #127 + 128 @ alignment + stack
275 bic r0, r0, #127 @ align the kernel length
277 * r0 = decompressed kernel length
279 * r4 = kernel execution address
280 * r5 = decompressed kernel start
281 * r7 = architecture ID
283 * r9-r12,r14 = corrupted
285 add r1, r5, r0 @ end of decompressed kernel
289 1: ldmia r2!, {r9 - r12, r14} @ copy relocation code
290 stmia r1!, {r9 - r12, r14}
291 ldmia r2!, {r9 - r12, r14}
292 stmia r1!, {r9 - r12, r14}
296 add sp, sp, #128 @ relocate the stack
299 ARM( add pc, r5, r0 ) @ call relocation code
300 THUMB( add r12, r5, r0 )
301 THUMB( mov pc, r12 ) @ call relocation code
304 * We're not in danger of overwriting ourselves. Do this the simple way.
306 * r4 = kernel execution address
307 * r7 = architecture ID
309 wont_overwrite: mov r0, r4
317 .word __bss_start @ r2
320 .word _image_size @ r6
321 .word _got_start @ r11
323 .word user_stack_end @ sp
324 LC1: .word reloc_end - reloc_start
327 #ifdef CONFIG_ARCH_RPC
329 params: ldr r0, =0x10000100 @ params_phys for RPC
336 * Turn on the cache. We need to setup some page tables so that we
337 * can have both the I and D caches on.
339 * We place the page tables 16k down from the kernel execution address,
340 * and we hope that nothing else is using it. If we're using it, we
344 * r4 = kernel execution address
345 * r7 = architecture number
348 * r0, r1, r2, r3, r9, r10, r12 corrupted
349 * This routine must preserve:
353 cache_on: mov r3, #8 @ cache_on function
357 * Initialize the highest priority protection region, PR7
358 * to cover all 32bit address and cacheable and bufferable.
360 __armv4_mpu_cache_on:
361 mov r0, #0x3f @ 4G, the whole
362 mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting
363 mcr p15, 0, r0, c6, c7, 1
366 mcr p15, 0, r0, c2, c0, 0 @ D-cache on
367 mcr p15, 0, r0, c2, c0, 1 @ I-cache on
368 mcr p15, 0, r0, c3, c0, 0 @ write-buffer on
371 mcr p15, 0, r0, c5, c0, 1 @ I-access permission
372 mcr p15, 0, r0, c5, c0, 0 @ D-access permission
375 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
376 mcr p15, 0, r0, c7, c5, 0 @ flush(inval) I-Cache
377 mcr p15, 0, r0, c7, c6, 0 @ flush(inval) D-Cache
378 mrc p15, 0, r0, c1, c0, 0 @ read control reg
379 @ ...I .... ..D. WC.M
380 orr r0, r0, #0x002d @ .... .... ..1. 11.1
381 orr r0, r0, #0x1000 @ ...1 .... .... ....
383 mcr p15, 0, r0, c1, c0, 0 @ write control reg
386 mcr p15, 0, r0, c7, c5, 0 @ flush(inval) I-Cache
387 mcr p15, 0, r0, c7, c6, 0 @ flush(inval) D-Cache
390 __armv3_mpu_cache_on:
391 mov r0, #0x3f @ 4G, the whole
392 mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting
395 mcr p15, 0, r0, c2, c0, 0 @ cache on
396 mcr p15, 0, r0, c3, c0, 0 @ write-buffer on
399 mcr p15, 0, r0, c5, c0, 0 @ access permission
402 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
404 * ?? ARMv3 MMU does not allow reading the control register,
405 * does this really work on ARMv3 MPU?
407 mrc p15, 0, r0, c1, c0, 0 @ read control reg
408 @ .... .... .... WC.M
409 orr r0, r0, #0x000d @ .... .... .... 11.1
410 /* ?? this overwrites the value constructed above? */
412 mcr p15, 0, r0, c1, c0, 0 @ write control reg
414 /* ?? invalidate for the second time? */
415 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
418 __setup_mmu: sub r3, r4, #16384 @ Page directory size
419 bic r3, r3, #0xff @ Align the pointer
422 * Initialise the page tables, turning on the cacheable and bufferable
423 * bits for the RAM area only.
427 mov r9, r9, lsl #18 @ start of RAM
428 add r10, r9, #0x10000000 @ a reasonable RAM size
432 1: cmp r1, r9 @ if virt > start of RAM
433 orrhs r1, r1, #0x0c @ set cacheable, bufferable
434 cmp r1, r10 @ if virt > end of RAM
435 bichs r1, r1, #0x0c @ clear cacheable, bufferable
436 str r1, [r0], #4 @ 1:1 mapping
441 * If ever we are running from Flash, then we surely want the cache
442 * to be enabled also for our execution instance... We map 2MB of it
443 * so there is no map overlap problem for up to 1 MB compressed kernel.
444 * If the execution is in RAM then we would only be duplicating the above.
449 orr r1, r1, r2, lsl #20
450 add r0, r3, r2, lsl #2
457 __armv4_mmu_cache_on:
462 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
463 mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
464 mrc p15, 0, r0, c1, c0, 0 @ read control reg
465 orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement
467 #ifdef CONFIG_CPU_ENDIAN_BE8
468 orr r0, r0, #1 << 25 @ big-endian page tables
470 bl __common_mmu_cache_on
472 mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
476 __armv7_mmu_cache_on:
479 mrc p15, 0, r11, c0, c1, 4 @ read ID_MMFR0
483 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
485 mcrne p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
487 mrc p15, 0, r0, c1, c0, 0 @ read control reg
488 orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement
489 orr r0, r0, #0x003c @ write buffer
491 #ifdef CONFIG_CPU_ENDIAN_BE8
492 orr r0, r0, #1 << 25 @ big-endian page tables
494 orrne r0, r0, #1 @ MMU enabled
496 mcrne p15, 0, r3, c2, c0, 0 @ load page table pointer
497 mcrne p15, 0, r1, c3, c0, 0 @ load domain access control
499 mcr p15, 0, r0, c1, c0, 0 @ load control register
500 mrc p15, 0, r0, c1, c0, 0 @ and read it back
502 mcr p15, 0, r0, c7, c5, 4 @ ISB
509 mcr p15, 0, r0, c7, c7, 0 @ Invalidate whole cache
510 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
511 mcr p15, 0, r0, c8, c7, 0 @ flush UTLB
512 mrc p15, 0, r0, c1, c0, 0 @ read control reg
513 orr r0, r0, #0x1000 @ I-cache enable
514 bl __common_mmu_cache_on
516 mcr p15, 0, r0, c8, c7, 0 @ flush UTLB
523 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
524 mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3
526 bl __common_mmu_cache_on
528 mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3
531 __common_mmu_cache_on:
532 #ifndef CONFIG_THUMB2_KERNEL
534 orr r0, r0, #0x000d @ Write buffer, mmu
537 mcr p15, 0, r3, c2, c0, 0 @ load page table pointer
538 mcr p15, 0, r1, c3, c0, 0 @ load domain access control
540 .align 5 @ cache line aligned
541 1: mcr p15, 0, r0, c1, c0, 0 @ load control register
542 mrc p15, 0, r0, c1, c0, 0 @ and read it back to
543 sub pc, lr, r0, lsr #32 @ properly flush pipeline
547 * All code following this line is relocatable. It is relocated by
548 * the above code to the end of the decompressed kernel image and
549 * executed there. During this time, we have no stacks.
551 * r0 = decompressed kernel length
553 * r4 = kernel execution address
554 * r5 = decompressed kernel start
555 * r7 = architecture ID
557 * r9-r12,r14 = corrupted
560 reloc_start: add r9, r5, r0
561 sub r9, r9, #128 @ do not copy the stack
566 ldmia r5!, {r0, r2, r3, r10 - r12, r14} @ relocate kernel
567 stmia r1!, {r0, r2, r3, r10 - r12, r14}
573 add sp, sp, #128 @ relocate the stack
576 call_kernel: bl cache_clean_flush
578 mov r0, #0 @ must be zero
579 mov r1, r7 @ restore architecture number
580 mov r2, r8 @ restore atags pointer
581 mov pc, r4 @ call kernel
584 * Here follow the relocatable cache support functions for the
585 * various processors. This is a generic hook for locating an
586 * entry and jumping to an instruction at the specified offset
587 * from the start of the block. Please note this is all position
597 call_cache_fn: adr r12, proc_types
598 #ifdef CONFIG_CPU_CP15
599 mrc p15, 0, r9, c0, c0 @ get processor ID
601 ldr r9, =CONFIG_PROCESSOR_ID
603 1: ldr r1, [r12, #0] @ get value
604 ldr r2, [r12, #4] @ get mask
605 eor r1, r1, r9 @ (real ^ match)
607 ARM( addeq pc, r12, r3 ) @ call cache function
608 THUMB( addeq r12, r3 )
609 THUMB( moveq pc, r12 ) @ call cache function
614 * Table for cache operations. This is basically:
617 * - 'cache on' method instruction
618 * - 'cache off' method instruction
619 * - 'cache flush' method instruction
621 * We match an entry using: ((real_id ^ match) & mask) == 0
623 * Writethrough caches generally only need 'on' and 'off'
624 * methods. Writeback caches _must_ have the flush method
628 .type proc_types,#object
630 .word 0x41560600 @ ARM6/610
632 W(b) __arm6_mmu_cache_off @ works, but slow
633 W(b) __arm6_mmu_cache_off
636 @ b __arm6_mmu_cache_on @ untested
637 @ b __arm6_mmu_cache_off
638 @ b __armv3_mmu_cache_flush
640 .word 0x00000000 @ old ARM ID
649 .word 0x41007000 @ ARM7/710
651 W(b) __arm7_mmu_cache_off
652 W(b) __arm7_mmu_cache_off
656 .word 0x41807200 @ ARM720T (writethrough)
658 W(b) __armv4_mmu_cache_on
659 W(b) __armv4_mmu_cache_off
663 .word 0x41007400 @ ARM74x
665 W(b) __armv3_mpu_cache_on
666 W(b) __armv3_mpu_cache_off
667 W(b) __armv3_mpu_cache_flush
669 .word 0x41009400 @ ARM94x
671 W(b) __armv4_mpu_cache_on
672 W(b) __armv4_mpu_cache_off
673 W(b) __armv4_mpu_cache_flush
675 .word 0x00007000 @ ARM7 IDs
684 @ Everything from here on will be the new ID system.
686 .word 0x4401a100 @ sa110 / sa1100
688 W(b) __armv4_mmu_cache_on
689 W(b) __armv4_mmu_cache_off
690 W(b) __armv4_mmu_cache_flush
692 .word 0x6901b110 @ sa1110
694 W(b) __armv4_mmu_cache_on
695 W(b) __armv4_mmu_cache_off
696 W(b) __armv4_mmu_cache_flush
699 .word 0xffffff00 @ PXA9xx
700 W(b) __armv4_mmu_cache_on
701 W(b) __armv4_mmu_cache_off
702 W(b) __armv4_mmu_cache_flush
704 .word 0x56158000 @ PXA168
706 W(b) __armv4_mmu_cache_on
707 W(b) __armv4_mmu_cache_off
708 W(b) __armv5tej_mmu_cache_flush
710 .word 0x56050000 @ Feroceon
712 W(b) __armv4_mmu_cache_on
713 W(b) __armv4_mmu_cache_off
714 W(b) __armv5tej_mmu_cache_flush
716 #ifdef CONFIG_CPU_FEROCEON_OLD_ID
717 /* this conflicts with the standard ARMv5TE entry */
718 .long 0x41009260 @ Old Feroceon
720 b __armv4_mmu_cache_on
721 b __armv4_mmu_cache_off
722 b __armv5tej_mmu_cache_flush
725 .word 0x66015261 @ FA526
727 W(b) __fa526_cache_on
728 W(b) __armv4_mmu_cache_off
729 W(b) __fa526_cache_flush
731 @ These match on the architecture ID
733 .word 0x00020000 @ ARMv4T
735 W(b) __armv4_mmu_cache_on
736 W(b) __armv4_mmu_cache_off
737 W(b) __armv4_mmu_cache_flush
739 .word 0x00050000 @ ARMv5TE
741 W(b) __armv4_mmu_cache_on
742 W(b) __armv4_mmu_cache_off
743 W(b) __armv4_mmu_cache_flush
745 .word 0x00060000 @ ARMv5TEJ
747 W(b) __armv4_mmu_cache_on
748 W(b) __armv4_mmu_cache_off
749 W(b) __armv5tej_mmu_cache_flush
751 .word 0x0007b000 @ ARMv6
753 W(b) __armv4_mmu_cache_on
754 W(b) __armv4_mmu_cache_off
755 W(b) __armv6_mmu_cache_flush
757 .word 0x560f5810 @ Marvell PJ4 ARMv6
759 W(b) __armv4_mmu_cache_on
760 W(b) __armv4_mmu_cache_off
761 W(b) __armv6_mmu_cache_flush
763 .word 0x000f0000 @ new CPU Id
765 W(b) __armv7_mmu_cache_on
766 W(b) __armv7_mmu_cache_off
767 W(b) __armv7_mmu_cache_flush
769 .word 0 @ unrecognised type
778 .size proc_types, . - proc_types
781 * Turn off the Cache and MMU. ARMv3 does not support
782 * reading the control register, but ARMv4 does.
785 * r0, r1, r2, r3, r9, r12 corrupted
786 * This routine must preserve:
790 cache_off: mov r3, #12 @ cache_off function
793 __armv4_mpu_cache_off:
794 mrc p15, 0, r0, c1, c0
796 mcr p15, 0, r0, c1, c0 @ turn MPU and cache off
798 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
799 mcr p15, 0, r0, c7, c6, 0 @ flush D-Cache
800 mcr p15, 0, r0, c7, c5, 0 @ flush I-Cache
803 __armv3_mpu_cache_off:
804 mrc p15, 0, r0, c1, c0
806 mcr p15, 0, r0, c1, c0, 0 @ turn MPU and cache off
808 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
811 __armv4_mmu_cache_off:
813 mrc p15, 0, r0, c1, c0
815 mcr p15, 0, r0, c1, c0 @ turn MMU and cache off
817 mcr p15, 0, r0, c7, c7 @ invalidate whole cache v4
818 mcr p15, 0, r0, c8, c7 @ invalidate whole TLB v4
822 __armv7_mmu_cache_off:
823 mrc p15, 0, r0, c1, c0
829 mcr p15, 0, r0, c1, c0 @ turn MMU and cache off
831 bl __armv7_mmu_cache_flush
834 mcr p15, 0, r0, c8, c7, 0 @ invalidate whole TLB
836 mcr p15, 0, r0, c7, c5, 6 @ invalidate BTC
837 mcr p15, 0, r0, c7, c10, 4 @ DSB
838 mcr p15, 0, r0, c7, c5, 4 @ ISB
841 __arm6_mmu_cache_off:
842 mov r0, #0x00000030 @ ARM6 control reg.
843 b __armv3_mmu_cache_off
845 __arm7_mmu_cache_off:
846 mov r0, #0x00000070 @ ARM7 control reg.
847 b __armv3_mmu_cache_off
849 __armv3_mmu_cache_off:
850 mcr p15, 0, r0, c1, c0, 0 @ turn MMU and cache off
852 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
853 mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3
857 * Clean and flush the cache to maintain consistency.
860 * r1, r2, r3, r9, r10, r11, r12 corrupted
861 * This routine must preserve:
869 __armv4_mpu_cache_flush:
872 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
873 mov r1, #7 << 5 @ 8 segments
874 1: orr r3, r1, #63 << 26 @ 64 entries
875 2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
876 subs r3, r3, #1 << 26
877 bcs 2b @ entries 63 to 0
879 bcs 1b @ segments 7 to 0
882 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
883 mcr p15, 0, ip, c7, c10, 4 @ drain WB
888 mcr p15, 0, r1, c7, c14, 0 @ clean and invalidate D cache
889 mcr p15, 0, r1, c7, c5, 0 @ flush I cache
890 mcr p15, 0, r1, c7, c10, 4 @ drain WB
893 __armv6_mmu_cache_flush:
895 mcr p15, 0, r1, c7, c14, 0 @ clean+invalidate D
896 mcr p15, 0, r1, c7, c5, 0 @ invalidate I+BTB
897 mcr p15, 0, r1, c7, c15, 0 @ clean+invalidate unified
898 mcr p15, 0, r1, c7, c10, 4 @ drain WB
901 __armv7_mmu_cache_flush:
902 mrc p15, 0, r10, c0, c1, 5 @ read ID_MMFR1
903 tst r10, #0xf << 16 @ hierarchical cache (ARMv7)
906 mcr p15, 0, r10, c7, c14, 0 @ clean+invalidate D
909 mcr p15, 0, r10, c7, c10, 5 @ DMB
910 stmfd sp!, {r0-r7, r9-r11}
911 mrc p15, 1, r0, c0, c0, 1 @ read clidr
912 ands r3, r0, #0x7000000 @ extract loc from clidr
913 mov r3, r3, lsr #23 @ left align loc bit field
914 beq finished @ if loc is 0, then no need to clean
915 mov r10, #0 @ start clean at cache level 0
917 add r2, r10, r10, lsr #1 @ work out 3x current cache level
918 mov r1, r0, lsr r2 @ extract cache type bits from clidr
919 and r1, r1, #7 @ mask of the bits for current cache only
920 cmp r1, #2 @ see what cache we have at this level
921 blt skip @ skip if no cache, or just i-cache
922 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
923 mcr p15, 0, r10, c7, c5, 4 @ isb to sych the new cssr&csidr
924 mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
925 and r2, r1, #7 @ extract the length of the cache lines
926 add r2, r2, #4 @ add 4 (line length offset)
928 ands r4, r4, r1, lsr #3 @ find maximum number on the way size
929 clz r5, r4 @ find bit position of way size increment
931 ands r7, r7, r1, lsr #13 @ extract max number of the index size
933 mov r9, r4 @ create working copy of max way size
935 ARM( orr r11, r10, r9, lsl r5 ) @ factor way and cache number into r11
936 ARM( orr r11, r11, r7, lsl r2 ) @ factor index number into r11
937 THUMB( lsl r6, r9, r5 )
938 THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11
939 THUMB( lsl r6, r7, r2 )
940 THUMB( orr r11, r11, r6 ) @ factor index number into r11
941 mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
942 subs r9, r9, #1 @ decrement the way
944 subs r7, r7, #1 @ decrement the index
947 add r10, r10, #2 @ increment cache number
951 ldmfd sp!, {r0-r7, r9-r11}
952 mov r10, #0 @ swith back to cache level 0
953 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
955 mcr p15, 0, r10, c7, c10, 4 @ DSB
956 mcr p15, 0, r10, c7, c5, 0 @ invalidate I+BTB
957 mcr p15, 0, r10, c7, c10, 4 @ DSB
958 mcr p15, 0, r10, c7, c5, 4 @ ISB
961 __armv5tej_mmu_cache_flush:
962 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate D cache
964 mcr p15, 0, r0, c7, c5, 0 @ flush I cache
965 mcr p15, 0, r0, c7, c10, 4 @ drain WB
968 __armv4_mmu_cache_flush:
969 mov r2, #64*1024 @ default: 32K dcache size (*2)
970 mov r11, #32 @ default: 32 byte line size
971 mrc p15, 0, r3, c0, c0, 1 @ read cache type
972 teq r3, r9 @ cache ID register present?
977 mov r2, r2, lsl r1 @ base dcache size *2
978 tst r3, #1 << 14 @ test M bit
979 addne r2, r2, r2, lsr #1 @ +1/2 size if M == 1
983 mov r11, r11, lsl r3 @ cache line size in bytes
986 bic r1, r1, #63 @ align to longest cache line
989 ARM( ldr r3, [r1], r11 ) @ s/w flush D cache
990 THUMB( ldr r3, [r1] ) @ s/w flush D cache
991 THUMB( add r1, r1, r11 )
995 mcr p15, 0, r1, c7, c5, 0 @ flush I cache
996 mcr p15, 0, r1, c7, c6, 0 @ flush D cache
997 mcr p15, 0, r1, c7, c10, 4 @ drain WB
1000 __armv3_mmu_cache_flush:
1001 __armv3_mpu_cache_flush:
1003 mcr p15, 0, r1, c7, c0, 0 @ invalidate whole cache v3
1007 * Various debugging routines for printing hex characters and
1008 * memory, which again must be relocatable.
1012 .type phexbuf,#object
1014 .size phexbuf, . - phexbuf
1016 @ phex corrupts {r0, r1, r2, r3}
1017 phex: adr r3, phexbuf
1031 @ puts corrupts {r0, r1, r2, r3}
1033 1: ldrb r2, [r0], #1
1046 @ putc corrupts {r0, r1, r2, r3}
1053 @ memdump corrupts {r0, r1, r2, r3, r10, r11, r12, lr}
1054 memdump: mov r12, r0
1057 2: mov r0, r11, lsl #2
1065 ldr r0, [r12, r11, lsl #2]
1087 .section ".stack", "w"
1088 user_stack: .space 4096