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 ARM( ldmia r0, {r1, r2, r3, r5, r6, r11, ip, sp})
174 THUMB( ldmia r0, {r1, r2, r3, r5, r6, r11, ip} )
175 THUMB( ldr sp, [r0, #32] )
176 #ifdef CONFIG_AUTO_ZRELADDR
177 @ determine final kernel image address
178 and r4, pc, #0xf8000000
179 add r4, r4, #TEXT_OFFSET
181 ldr r4, =CONFIG_ZRELADDR
183 subs r0, r0, r1 @ calculate the delta offset
185 @ if delta is zero, we are
186 beq not_relocated @ running at the address we
190 * We're running at a different address. We need to fix
191 * up various pointers:
192 * r5 - zImage base address (_start)
193 * r6 - size of decompressed image
201 #ifndef CONFIG_ZBOOT_ROM
203 * If we're running fully PIC === CONFIG_ZBOOT_ROM = n,
204 * we need to fix up pointers into the BSS region.
214 * Relocate all entries in the GOT table.
216 1: ldr r1, [r11, #0] @ relocate entries in the GOT
217 add r1, r1, r0 @ table. This fixes up the
218 str r1, [r11], #4 @ C references.
224 * Relocate entries in the GOT table. We only relocate
225 * the entries that are outside the (relocated) BSS region.
227 1: ldr r1, [r11, #0] @ relocate entries in the GOT
228 cmp r1, r2 @ entry < bss_start ||
229 cmphs r3, r1 @ _end < entry
230 addlo r1, r1, r0 @ table. This fixes up the
231 str r1, [r11], #4 @ C references.
236 not_relocated: mov r0, #0
237 1: str r0, [r2], #4 @ clear bss
245 * The C runtime environment should now be setup
246 * sufficiently. Turn the cache on, set up some
247 * pointers, and start decompressing.
251 mov r1, sp @ malloc space above stack
252 add r2, sp, #0x10000 @ 64k max
255 * Check to see if we will overwrite ourselves.
256 * r4 = final kernel address
257 * r5 = start of this image
258 * r6 = size of decompressed image
259 * r2 = end of malloc space (and therefore this image)
262 * r4 + image length <= r5 -> OK
270 mov r5, r2 @ decompress after malloc space
275 add r0, r0, #127 + 128 @ alignment + stack
276 bic r0, r0, #127 @ align the kernel length
278 * r0 = decompressed kernel length
280 * r4 = kernel execution address
281 * r5 = decompressed kernel start
282 * r7 = architecture ID
284 * r9-r12,r14 = corrupted
286 add r1, r5, r0 @ end of decompressed kernel
290 1: ldmia r2!, {r9 - r12, r14} @ copy relocation code
291 stmia r1!, {r9 - r12, r14}
292 ldmia r2!, {r9 - r12, r14}
293 stmia r1!, {r9 - r12, r14}
297 add sp, sp, #128 @ relocate the stack
300 ARM( add pc, r5, r0 ) @ call relocation code
301 THUMB( add r12, r5, r0 )
302 THUMB( mov pc, r12 ) @ call relocation code
305 * We're not in danger of overwriting ourselves. Do this the simple way.
307 * r4 = kernel execution address
308 * r7 = architecture ID
310 wont_overwrite: mov r0, r4
318 .word __bss_start @ r2
321 .word _image_size @ r6
322 .word _got_start @ r11
324 .word user_stack_end @ sp
325 LC1: .word reloc_end - reloc_start
328 #ifdef CONFIG_ARCH_RPC
330 params: ldr r0, =0x10000100 @ params_phys for RPC
337 * Turn on the cache. We need to setup some page tables so that we
338 * can have both the I and D caches on.
340 * We place the page tables 16k down from the kernel execution address,
341 * and we hope that nothing else is using it. If we're using it, we
345 * r4 = kernel execution address
346 * r7 = architecture number
349 * r0, r1, r2, r3, r9, r10, r12 corrupted
350 * This routine must preserve:
354 cache_on: mov r3, #8 @ cache_on function
358 * Initialize the highest priority protection region, PR7
359 * to cover all 32bit address and cacheable and bufferable.
361 __armv4_mpu_cache_on:
362 mov r0, #0x3f @ 4G, the whole
363 mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting
364 mcr p15, 0, r0, c6, c7, 1
367 mcr p15, 0, r0, c2, c0, 0 @ D-cache on
368 mcr p15, 0, r0, c2, c0, 1 @ I-cache on
369 mcr p15, 0, r0, c3, c0, 0 @ write-buffer on
372 mcr p15, 0, r0, c5, c0, 1 @ I-access permission
373 mcr p15, 0, r0, c5, c0, 0 @ D-access permission
376 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
377 mcr p15, 0, r0, c7, c5, 0 @ flush(inval) I-Cache
378 mcr p15, 0, r0, c7, c6, 0 @ flush(inval) D-Cache
379 mrc p15, 0, r0, c1, c0, 0 @ read control reg
380 @ ...I .... ..D. WC.M
381 orr r0, r0, #0x002d @ .... .... ..1. 11.1
382 orr r0, r0, #0x1000 @ ...1 .... .... ....
384 mcr p15, 0, r0, c1, c0, 0 @ write control reg
387 mcr p15, 0, r0, c7, c5, 0 @ flush(inval) I-Cache
388 mcr p15, 0, r0, c7, c6, 0 @ flush(inval) D-Cache
391 __armv3_mpu_cache_on:
392 mov r0, #0x3f @ 4G, the whole
393 mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting
396 mcr p15, 0, r0, c2, c0, 0 @ cache on
397 mcr p15, 0, r0, c3, c0, 0 @ write-buffer on
400 mcr p15, 0, r0, c5, c0, 0 @ access permission
403 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
405 * ?? ARMv3 MMU does not allow reading the control register,
406 * does this really work on ARMv3 MPU?
408 mrc p15, 0, r0, c1, c0, 0 @ read control reg
409 @ .... .... .... WC.M
410 orr r0, r0, #0x000d @ .... .... .... 11.1
411 /* ?? this overwrites the value constructed above? */
413 mcr p15, 0, r0, c1, c0, 0 @ write control reg
415 /* ?? invalidate for the second time? */
416 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
419 __setup_mmu: sub r3, r4, #16384 @ Page directory size
420 bic r3, r3, #0xff @ Align the pointer
423 * Initialise the page tables, turning on the cacheable and bufferable
424 * bits for the RAM area only.
428 mov r9, r9, lsl #18 @ start of RAM
429 add r10, r9, #0x10000000 @ a reasonable RAM size
433 1: cmp r1, r9 @ if virt > start of RAM
434 orrhs r1, r1, #0x0c @ set cacheable, bufferable
435 cmp r1, r10 @ if virt > end of RAM
436 bichs r1, r1, #0x0c @ clear cacheable, bufferable
437 str r1, [r0], #4 @ 1:1 mapping
442 * If ever we are running from Flash, then we surely want the cache
443 * to be enabled also for our execution instance... We map 2MB of it
444 * so there is no map overlap problem for up to 1 MB compressed kernel.
445 * If the execution is in RAM then we would only be duplicating the above.
450 orr r1, r1, r2, lsl #20
451 add r0, r3, r2, lsl #2
458 __armv4_mmu_cache_on:
463 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
464 mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
465 mrc p15, 0, r0, c1, c0, 0 @ read control reg
466 orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement
468 #ifdef CONFIG_CPU_ENDIAN_BE8
469 orr r0, r0, #1 << 25 @ big-endian page tables
471 bl __common_mmu_cache_on
473 mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
477 __armv7_mmu_cache_on:
480 mrc p15, 0, r11, c0, c1, 4 @ read ID_MMFR0
484 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
486 mcrne p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
488 mrc p15, 0, r0, c1, c0, 0 @ read control reg
489 orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement
490 orr r0, r0, #0x003c @ write buffer
492 #ifdef CONFIG_CPU_ENDIAN_BE8
493 orr r0, r0, #1 << 25 @ big-endian page tables
495 orrne r0, r0, #1 @ MMU enabled
497 mcrne p15, 0, r3, c2, c0, 0 @ load page table pointer
498 mcrne p15, 0, r1, c3, c0, 0 @ load domain access control
500 mcr p15, 0, r0, c1, c0, 0 @ load control register
501 mrc p15, 0, r0, c1, c0, 0 @ and read it back
503 mcr p15, 0, r0, c7, c5, 4 @ ISB
510 mcr p15, 0, r0, c7, c7, 0 @ Invalidate whole cache
511 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
512 mcr p15, 0, r0, c8, c7, 0 @ flush UTLB
513 mrc p15, 0, r0, c1, c0, 0 @ read control reg
514 orr r0, r0, #0x1000 @ I-cache enable
515 bl __common_mmu_cache_on
517 mcr p15, 0, r0, c8, c7, 0 @ flush UTLB
524 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
525 mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3
527 bl __common_mmu_cache_on
529 mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3
532 __common_mmu_cache_on:
533 #ifndef CONFIG_THUMB2_KERNEL
535 orr r0, r0, #0x000d @ Write buffer, mmu
538 mcr p15, 0, r3, c2, c0, 0 @ load page table pointer
539 mcr p15, 0, r1, c3, c0, 0 @ load domain access control
541 .align 5 @ cache line aligned
542 1: mcr p15, 0, r0, c1, c0, 0 @ load control register
543 mrc p15, 0, r0, c1, c0, 0 @ and read it back to
544 sub pc, lr, r0, lsr #32 @ properly flush pipeline
548 * All code following this line is relocatable. It is relocated by
549 * the above code to the end of the decompressed kernel image and
550 * executed there. During this time, we have no stacks.
552 * r0 = decompressed kernel length
554 * r4 = kernel execution address
555 * r5 = decompressed kernel start
556 * r7 = architecture ID
558 * r9-r12,r14 = corrupted
561 reloc_start: add r9, r5, r0
562 sub r9, r9, #128 @ do not copy the stack
567 ldmia r5!, {r0, r2, r3, r10 - r12, r14} @ relocate kernel
568 stmia r1!, {r0, r2, r3, r10 - r12, r14}
574 add sp, sp, #128 @ relocate the stack
577 call_kernel: bl cache_clean_flush
579 mov r0, #0 @ must be zero
580 mov r1, r7 @ restore architecture number
581 mov r2, r8 @ restore atags pointer
582 mov pc, r4 @ call kernel
585 * Here follow the relocatable cache support functions for the
586 * various processors. This is a generic hook for locating an
587 * entry and jumping to an instruction at the specified offset
588 * from the start of the block. Please note this is all position
598 call_cache_fn: adr r12, proc_types
599 #ifdef CONFIG_CPU_CP15
600 mrc p15, 0, r9, c0, c0 @ get processor ID
602 ldr r9, =CONFIG_PROCESSOR_ID
604 1: ldr r1, [r12, #0] @ get value
605 ldr r2, [r12, #4] @ get mask
606 eor r1, r1, r9 @ (real ^ match)
608 ARM( addeq pc, r12, r3 ) @ call cache function
609 THUMB( addeq r12, r3 )
610 THUMB( moveq pc, r12 ) @ call cache function
615 * Table for cache operations. This is basically:
618 * - 'cache on' method instruction
619 * - 'cache off' method instruction
620 * - 'cache flush' method instruction
622 * We match an entry using: ((real_id ^ match) & mask) == 0
624 * Writethrough caches generally only need 'on' and 'off'
625 * methods. Writeback caches _must_ have the flush method
629 .type proc_types,#object
631 .word 0x41560600 @ ARM6/610
633 W(b) __arm6_mmu_cache_off @ works, but slow
634 W(b) __arm6_mmu_cache_off
637 @ b __arm6_mmu_cache_on @ untested
638 @ b __arm6_mmu_cache_off
639 @ b __armv3_mmu_cache_flush
641 .word 0x00000000 @ old ARM ID
650 .word 0x41007000 @ ARM7/710
652 W(b) __arm7_mmu_cache_off
653 W(b) __arm7_mmu_cache_off
657 .word 0x41807200 @ ARM720T (writethrough)
659 W(b) __armv4_mmu_cache_on
660 W(b) __armv4_mmu_cache_off
664 .word 0x41007400 @ ARM74x
666 W(b) __armv3_mpu_cache_on
667 W(b) __armv3_mpu_cache_off
668 W(b) __armv3_mpu_cache_flush
670 .word 0x41009400 @ ARM94x
672 W(b) __armv4_mpu_cache_on
673 W(b) __armv4_mpu_cache_off
674 W(b) __armv4_mpu_cache_flush
676 .word 0x00007000 @ ARM7 IDs
685 @ Everything from here on will be the new ID system.
687 .word 0x4401a100 @ sa110 / sa1100
689 W(b) __armv4_mmu_cache_on
690 W(b) __armv4_mmu_cache_off
691 W(b) __armv4_mmu_cache_flush
693 .word 0x6901b110 @ sa1110
695 W(b) __armv4_mmu_cache_on
696 W(b) __armv4_mmu_cache_off
697 W(b) __armv4_mmu_cache_flush
700 .word 0xffffff00 @ PXA9xx
701 W(b) __armv4_mmu_cache_on
702 W(b) __armv4_mmu_cache_off
703 W(b) __armv4_mmu_cache_flush
705 .word 0x56158000 @ PXA168
707 W(b) __armv4_mmu_cache_on
708 W(b) __armv4_mmu_cache_off
709 W(b) __armv5tej_mmu_cache_flush
711 .word 0x56050000 @ Feroceon
713 W(b) __armv4_mmu_cache_on
714 W(b) __armv4_mmu_cache_off
715 W(b) __armv5tej_mmu_cache_flush
717 #ifdef CONFIG_CPU_FEROCEON_OLD_ID
718 /* this conflicts with the standard ARMv5TE entry */
719 .long 0x41009260 @ Old Feroceon
721 b __armv4_mmu_cache_on
722 b __armv4_mmu_cache_off
723 b __armv5tej_mmu_cache_flush
726 .word 0x66015261 @ FA526
728 W(b) __fa526_cache_on
729 W(b) __armv4_mmu_cache_off
730 W(b) __fa526_cache_flush
732 @ These match on the architecture ID
734 .word 0x00020000 @ ARMv4T
736 W(b) __armv4_mmu_cache_on
737 W(b) __armv4_mmu_cache_off
738 W(b) __armv4_mmu_cache_flush
740 .word 0x00050000 @ ARMv5TE
742 W(b) __armv4_mmu_cache_on
743 W(b) __armv4_mmu_cache_off
744 W(b) __armv4_mmu_cache_flush
746 .word 0x00060000 @ ARMv5TEJ
748 W(b) __armv4_mmu_cache_on
749 W(b) __armv4_mmu_cache_off
750 W(b) __armv5tej_mmu_cache_flush
752 .word 0x0007b000 @ ARMv6
754 W(b) __armv4_mmu_cache_on
755 W(b) __armv4_mmu_cache_off
756 W(b) __armv6_mmu_cache_flush
758 .word 0x560f5810 @ Marvell PJ4 ARMv6
760 W(b) __armv4_mmu_cache_on
761 W(b) __armv4_mmu_cache_off
762 W(b) __armv6_mmu_cache_flush
764 .word 0x000f0000 @ new CPU Id
766 W(b) __armv7_mmu_cache_on
767 W(b) __armv7_mmu_cache_off
768 W(b) __armv7_mmu_cache_flush
770 .word 0 @ unrecognised type
779 .size proc_types, . - proc_types
782 * Turn off the Cache and MMU. ARMv3 does not support
783 * reading the control register, but ARMv4 does.
786 * r0, r1, r2, r3, r9, r12 corrupted
787 * This routine must preserve:
791 cache_off: mov r3, #12 @ cache_off function
794 __armv4_mpu_cache_off:
795 mrc p15, 0, r0, c1, c0
797 mcr p15, 0, r0, c1, c0 @ turn MPU and cache off
799 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
800 mcr p15, 0, r0, c7, c6, 0 @ flush D-Cache
801 mcr p15, 0, r0, c7, c5, 0 @ flush I-Cache
804 __armv3_mpu_cache_off:
805 mrc p15, 0, r0, c1, c0
807 mcr p15, 0, r0, c1, c0, 0 @ turn MPU and cache off
809 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
812 __armv4_mmu_cache_off:
814 mrc p15, 0, r0, c1, c0
816 mcr p15, 0, r0, c1, c0 @ turn MMU and cache off
818 mcr p15, 0, r0, c7, c7 @ invalidate whole cache v4
819 mcr p15, 0, r0, c8, c7 @ invalidate whole TLB v4
823 __armv7_mmu_cache_off:
824 mrc p15, 0, r0, c1, c0
830 mcr p15, 0, r0, c1, c0 @ turn MMU and cache off
832 bl __armv7_mmu_cache_flush
835 mcr p15, 0, r0, c8, c7, 0 @ invalidate whole TLB
837 mcr p15, 0, r0, c7, c5, 6 @ invalidate BTC
838 mcr p15, 0, r0, c7, c10, 4 @ DSB
839 mcr p15, 0, r0, c7, c5, 4 @ ISB
842 __arm6_mmu_cache_off:
843 mov r0, #0x00000030 @ ARM6 control reg.
844 b __armv3_mmu_cache_off
846 __arm7_mmu_cache_off:
847 mov r0, #0x00000070 @ ARM7 control reg.
848 b __armv3_mmu_cache_off
850 __armv3_mmu_cache_off:
851 mcr p15, 0, r0, c1, c0, 0 @ turn MMU and cache off
853 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
854 mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3
858 * Clean and flush the cache to maintain consistency.
861 * r1, r2, r3, r9, r10, r11, r12 corrupted
862 * This routine must preserve:
870 __armv4_mpu_cache_flush:
873 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
874 mov r1, #7 << 5 @ 8 segments
875 1: orr r3, r1, #63 << 26 @ 64 entries
876 2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
877 subs r3, r3, #1 << 26
878 bcs 2b @ entries 63 to 0
880 bcs 1b @ segments 7 to 0
883 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
884 mcr p15, 0, ip, c7, c10, 4 @ drain WB
889 mcr p15, 0, r1, c7, c14, 0 @ clean and invalidate D cache
890 mcr p15, 0, r1, c7, c5, 0 @ flush I cache
891 mcr p15, 0, r1, c7, c10, 4 @ drain WB
894 __armv6_mmu_cache_flush:
896 mcr p15, 0, r1, c7, c14, 0 @ clean+invalidate D
897 mcr p15, 0, r1, c7, c5, 0 @ invalidate I+BTB
898 mcr p15, 0, r1, c7, c15, 0 @ clean+invalidate unified
899 mcr p15, 0, r1, c7, c10, 4 @ drain WB
902 __armv7_mmu_cache_flush:
903 mrc p15, 0, r10, c0, c1, 5 @ read ID_MMFR1
904 tst r10, #0xf << 16 @ hierarchical cache (ARMv7)
907 mcr p15, 0, r10, c7, c14, 0 @ clean+invalidate D
910 mcr p15, 0, r10, c7, c10, 5 @ DMB
911 stmfd sp!, {r0-r7, r9-r11}
912 mrc p15, 1, r0, c0, c0, 1 @ read clidr
913 ands r3, r0, #0x7000000 @ extract loc from clidr
914 mov r3, r3, lsr #23 @ left align loc bit field
915 beq finished @ if loc is 0, then no need to clean
916 mov r10, #0 @ start clean at cache level 0
918 add r2, r10, r10, lsr #1 @ work out 3x current cache level
919 mov r1, r0, lsr r2 @ extract cache type bits from clidr
920 and r1, r1, #7 @ mask of the bits for current cache only
921 cmp r1, #2 @ see what cache we have at this level
922 blt skip @ skip if no cache, or just i-cache
923 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
924 mcr p15, 0, r10, c7, c5, 4 @ isb to sych the new cssr&csidr
925 mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
926 and r2, r1, #7 @ extract the length of the cache lines
927 add r2, r2, #4 @ add 4 (line length offset)
929 ands r4, r4, r1, lsr #3 @ find maximum number on the way size
930 clz r5, r4 @ find bit position of way size increment
932 ands r7, r7, r1, lsr #13 @ extract max number of the index size
934 mov r9, r4 @ create working copy of max way size
936 ARM( orr r11, r10, r9, lsl r5 ) @ factor way and cache number into r11
937 ARM( orr r11, r11, r7, lsl r2 ) @ factor index number into r11
938 THUMB( lsl r6, r9, r5 )
939 THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11
940 THUMB( lsl r6, r7, r2 )
941 THUMB( orr r11, r11, r6 ) @ factor index number into r11
942 mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
943 subs r9, r9, #1 @ decrement the way
945 subs r7, r7, #1 @ decrement the index
948 add r10, r10, #2 @ increment cache number
952 ldmfd sp!, {r0-r7, r9-r11}
953 mov r10, #0 @ swith back to cache level 0
954 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
956 mcr p15, 0, r10, c7, c10, 4 @ DSB
957 mcr p15, 0, r10, c7, c5, 0 @ invalidate I+BTB
958 mcr p15, 0, r10, c7, c10, 4 @ DSB
959 mcr p15, 0, r10, c7, c5, 4 @ ISB
962 __armv5tej_mmu_cache_flush:
963 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate D cache
965 mcr p15, 0, r0, c7, c5, 0 @ flush I cache
966 mcr p15, 0, r0, c7, c10, 4 @ drain WB
969 __armv4_mmu_cache_flush:
970 mov r2, #64*1024 @ default: 32K dcache size (*2)
971 mov r11, #32 @ default: 32 byte line size
972 mrc p15, 0, r3, c0, c0, 1 @ read cache type
973 teq r3, r9 @ cache ID register present?
978 mov r2, r2, lsl r1 @ base dcache size *2
979 tst r3, #1 << 14 @ test M bit
980 addne r2, r2, r2, lsr #1 @ +1/2 size if M == 1
984 mov r11, r11, lsl r3 @ cache line size in bytes
987 bic r1, r1, #63 @ align to longest cache line
990 ARM( ldr r3, [r1], r11 ) @ s/w flush D cache
991 THUMB( ldr r3, [r1] ) @ s/w flush D cache
992 THUMB( add r1, r1, r11 )
996 mcr p15, 0, r1, c7, c5, 0 @ flush I cache
997 mcr p15, 0, r1, c7, c6, 0 @ flush D cache
998 mcr p15, 0, r1, c7, c10, 4 @ drain WB
1001 __armv3_mmu_cache_flush:
1002 __armv3_mpu_cache_flush:
1004 mcr p15, 0, r1, c7, c0, 0 @ invalidate whole cache v3
1008 * Various debugging routines for printing hex characters and
1009 * memory, which again must be relocatable.
1013 .type phexbuf,#object
1015 .size phexbuf, . - phexbuf
1017 @ phex corrupts {r0, r1, r2, r3}
1018 phex: adr r3, phexbuf
1032 @ puts corrupts {r0, r1, r2, r3}
1034 1: ldrb r2, [r0], #1
1047 @ putc corrupts {r0, r1, r2, r3}
1054 @ memdump corrupts {r0, r1, r2, r3, r10, r11, r12, lr}
1055 memdump: mov r12, r0
1058 2: mov r0, r11, lsl #2
1066 ldr r0, [r12, r11, lsl #2]
1088 .section ".stack", "w"
1089 user_stack: .space 4096