| blob | af11c2f8f3b7a63c350db162511c779617d70f61 |
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>
12 #include <asm/assembler.h>
13 #include <asm/v7m.h>
15 #include "efi-header.S"
17 AR_CLASS( .arch armv7-a )
18 M_CLASS( .arch armv7-m )
20 /*
21 * Debugging stuff
22 *
23 * Note that these macros must not contain any code which is not
24 * 100% relocatable. Any attempt to do so will result in a crash.
25 * Please select one of the following when turning on debugging.
26 */
27 #ifdef DEBUG
29 #if defined(CONFIG_DEBUG_ICEDCC)
31 #if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7)
32 .macro loadsp, rb, tmp
33 .endm
34 .macro writeb, ch, rb
35 mcr p14, 0, \ch, c0, c5, 0
36 .endm
37 #elif defined(CONFIG_CPU_XSCALE)
38 .macro loadsp, rb, tmp
39 .endm
40 .macro writeb, ch, rb
41 mcr p14, 0, \ch, c8, c0, 0
42 .endm
43 #else
44 .macro loadsp, rb, tmp
45 .endm
46 .macro writeb, ch, rb
47 mcr p14, 0, \ch, c1, c0, 0
48 .endm
49 #endif
51 #else
53 #include CONFIG_DEBUG_LL_INCLUDE
55 .macro writeb, ch, rb
56 senduart \ch, \rb
57 .endm
59 #if defined(CONFIG_ARCH_SA1100)
60 .macro loadsp, rb, tmp
61 mov \rb, #0x80000000 @ physical base address
62 #ifdef CONFIG_DEBUG_LL_SER3
63 add \rb, \rb, #0x00050000 @ Ser3
64 #else
65 add \rb, \rb, #0x00010000 @ Ser1
66 #endif
67 .endm
68 #else
69 .macro loadsp, rb, tmp
70 addruart \rb, \tmp
71 .endm
72 #endif
73 #endif
74 #endif
76 .macro kputc,val
77 mov r0, \val
78 bl putc
79 .endm
81 .macro kphex,val,len
82 mov r0, \val
83 mov r1, #\len
84 bl phex
85 .endm
87 .macro debug_reloc_start
88 #ifdef DEBUG
89 kputc #'\n'
90 kphex r6, 8 /* processor id */
91 kputc #':'
92 kphex r7, 8 /* architecture id */
93 #ifdef CONFIG_CPU_CP15
94 kputc #':'
95 mrc p15, 0, r0, c1, c0
96 kphex r0, 8 /* control reg */
97 #endif
98 kputc #'\n'
99 kphex r5, 8 /* decompressed kernel start */
100 kputc #'-'
101 kphex r9, 8 /* decompressed kernel end */
102 kputc #'>'
103 kphex r4, 8 /* kernel execution address */
104 kputc #'\n'
105 #endif
106 .endm
108 .macro debug_reloc_end
109 #ifdef DEBUG
110 kphex r5, 8 /* end of kernel */
111 kputc #'\n'
112 mov r0, r4
113 bl memdump /* dump 256 bytes at start of kernel */
114 #endif
115 .endm
117 .section ".start", #alloc, #execinstr
118 /*
119 * sort out different calling conventions
120 */
121 .align
122 /*
123 * Always enter in ARM state for CPUs that support the ARM ISA.
124 * As of today (2014) that's exactly the members of the A and R
125 * classes.
126 */
127 AR_CLASS( .arm )
128 start:
129 .type start,#function
130 .rept 7
131 __nop
132 .endr
133 ARM( mov r0, r0 )
134 ARM( b 1f )
135 THUMB( badr r12, 1f )
136 THUMB( bx r12 )
138 .word _magic_sig @ Magic numbers to help the loader
139 .word _magic_start @ absolute load/run zImage address
140 .word _magic_end @ zImage end address
141 .word 0x04030201 @ endianness flag
143 THUMB( .thumb )
144 1: __EFI_HEADER
146 ARM_BE8( setend be ) @ go BE8 if compiled for BE8
147 AR_CLASS( mrs r9, cpsr )
148 #ifdef CONFIG_ARM_VIRT_EXT
149 bl __hyp_stub_install @ get into SVC mode, reversibly
150 #endif
151 mov r7, r1 @ save architecture ID
152 mov r8, r2 @ save atags pointer
154 #ifndef CONFIG_CPU_V7M
155 /*
156 * Booting from Angel - need to enter SVC mode and disable
157 * FIQs/IRQs (numeric definitions from angel arm.h source).
158 * We only do this if we were in user mode on entry.
159 */
160 mrs r2, cpsr @ get current mode
161 tst r2, #3 @ not user?
162 bne not_angel
163 mov r0, #0x17 @ angel_SWIreason_EnterSVC
164 ARM( swi 0x123456 ) @ angel_SWI_ARM
165 THUMB( svc 0xab ) @ angel_SWI_THUMB
166 not_angel:
167 safe_svcmode_maskall r0
168 msr spsr_cxsf, r9 @ Save the CPU boot mode in
169 @ SPSR
170 #endif
171 /*
172 * Note that some cache flushing and other stuff may
173 * be needed here - is there an Angel SWI call for this?
174 */
176 /*
177 * some architecture specific code can be inserted
178 * by the linker here, but it should preserve r7, r8, and r9.
179 */
181 .text
183 #ifdef CONFIG_AUTO_ZRELADDR
184 /*
185 * Find the start of physical memory. As we are executing
186 * without the MMU on, we are in the physical address space.
187 * We just need to get rid of any offset by aligning the
188 * address.
189 *
190 * This alignment is a balance between the requirements of
191 * different platforms - we have chosen 128MB to allow
192 * platforms which align the start of their physical memory
193 * to 128MB to use this feature, while allowing the zImage
194 * to be placed within the first 128MB of memory on other
195 * platforms. Increasing the alignment means we place
196 * stricter alignment requirements on the start of physical
197 * memory, but relaxing it means that we break people who
198 * are already placing their zImage in (eg) the top 64MB
199 * of this range.
200 */
201 mov r4, pc
202 and r4, r4, #0xf8000000
203 /* Determine final kernel image address. */
204 add r4, r4, #TEXT_OFFSET
205 #else
206 ldr r4, =zreladdr
207 #endif
209 /*
210 * Set up a page table only if it won't overwrite ourself.
211 * That means r4 < pc || r4 - 16k page directory > &_end.
212 * Given that r4 > &_end is most unfrequent, we add a rough
213 * additional 1MB of room for a possible appended DTB.
214 */
215 mov r0, pc
216 cmp r0, r4
217 ldrcc r0, LC0+32
218 addcc r0, r0, pc
219 cmpcc r4, r0
220 orrcc r4, r4, #1 @ remember we skipped cache_on
221 blcs cache_on
223 restart: adr r0, LC0
224 ldmia r0, {r1, r2, r3, r6, r10, r11, r12}
225 ldr sp, [r0, #28]
227 /*
228 * We might be running at a different address. We need
229 * to fix up various pointers.
230 */
231 sub r0, r0, r1 @ calculate the delta offset
232 add r6, r6, r0 @ _edata
233 add r10, r10, r0 @ inflated kernel size location
235 /*
236 * The kernel build system appends the size of the
237 * decompressed kernel at the end of the compressed data
238 * in little-endian form.
239 */
240 ldrb r9, [r10, #0]
241 ldrb lr, [r10, #1]
242 orr r9, r9, lr, lsl #8
243 ldrb lr, [r10, #2]
244 ldrb r10, [r10, #3]
245 orr r9, r9, lr, lsl #16
246 orr r9, r9, r10, lsl #24
248 #ifndef CONFIG_ZBOOT_ROM
249 /* malloc space is above the relocated stack (64k max) */
250 add sp, sp, r0
251 add r10, sp, #0x10000
252 #else
253 /*
254 * With ZBOOT_ROM the bss/stack is non relocatable,
255 * but someone could still run this code from RAM,
256 * in which case our reference is _edata.
257 */
258 mov r10, r6
259 #endif
261 mov r5, #0 @ init dtb size to 0
262 #ifdef CONFIG_ARM_APPENDED_DTB
263 /*
264 * r0 = delta
265 * r2 = BSS start
266 * r3 = BSS end
267 * r4 = final kernel address (possibly with LSB set)
268 * r5 = appended dtb size (still unknown)
269 * r6 = _edata
270 * r7 = architecture ID
271 * r8 = atags/device tree pointer
272 * r9 = size of decompressed image
273 * r10 = end of this image, including bss/stack/malloc space if non XIP
274 * r11 = GOT start
275 * r12 = GOT end
276 * sp = stack pointer
277 *
278 * if there are device trees (dtb) appended to zImage, advance r10 so that the
279 * dtb data will get relocated along with the kernel if necessary.
280 */
282 ldr lr, [r6, #0]
283 #ifndef __ARMEB__
284 ldr r1, =0xedfe0dd0 @ sig is 0xd00dfeed big endian
285 #else
286 ldr r1, =0xd00dfeed
287 #endif
288 cmp lr, r1
289 bne dtb_check_done @ not found
291 #ifdef CONFIG_ARM_ATAG_DTB_COMPAT
292 /*
293 * OK... Let's do some funky business here.
294 * If we do have a DTB appended to zImage, and we do have
295 * an ATAG list around, we want the later to be translated
296 * and folded into the former here. No GOT fixup has occurred
297 * yet, but none of the code we're about to call uses any
298 * global variable.
299 */
301 /* Get the initial DTB size */
302 ldr r5, [r6, #4]
303 #ifndef __ARMEB__
304 /* convert to little endian */
305 eor r1, r5, r5, ror #16
306 bic r1, r1, #0x00ff0000
307 mov r5, r5, ror #8
308 eor r5, r5, r1, lsr #8
309 #endif
310 /* 50% DTB growth should be good enough */
311 add r5, r5, r5, lsr #1
312 /* preserve 64-bit alignment */
313 add r5, r5, #7
314 bic r5, r5, #7
315 /* clamp to 32KB min and 1MB max */
316 cmp r5, #(1 << 15)
317 movlo r5, #(1 << 15)
318 cmp r5, #(1 << 20)
319 movhi r5, #(1 << 20)
320 /* temporarily relocate the stack past the DTB work space */
321 add sp, sp, r5
323 stmfd sp!, {r0-r3, ip, lr}
324 mov r0, r8
325 mov r1, r6
326 mov r2, r5
327 bl atags_to_fdt
329 /*
330 * If returned value is 1, there is no ATAG at the location
331 * pointed by r8. Try the typical 0x100 offset from start
332 * of RAM and hope for the best.
333 */
334 cmp r0, #1
335 sub r0, r4, #TEXT_OFFSET
336 bic r0, r0, #1
337 add r0, r0, #0x100
338 mov r1, r6
339 mov r2, r5
340 bleq atags_to_fdt
342 ldmfd sp!, {r0-r3, ip, lr}
343 sub sp, sp, r5
344 #endif
346 mov r8, r6 @ use the appended device tree
348 /*
349 * Make sure that the DTB doesn't end up in the final
350 * kernel's .bss area. To do so, we adjust the decompressed
351 * kernel size to compensate if that .bss size is larger
352 * than the relocated code.
353 */
354 ldr r5, =_kernel_bss_size
355 adr r1, wont_overwrite
356 sub r1, r6, r1
357 subs r1, r5, r1
358 addhi r9, r9, r1
360 /* Get the current DTB size */
361 ldr r5, [r6, #4]
362 #ifndef __ARMEB__
363 /* convert r5 (dtb size) to little endian */
364 eor r1, r5, r5, ror #16
365 bic r1, r1, #0x00ff0000
366 mov r5, r5, ror #8
367 eor r5, r5, r1, lsr #8
368 #endif
370 /* preserve 64-bit alignment */
371 add r5, r5, #7
372 bic r5, r5, #7
374 /* relocate some pointers past the appended dtb */
375 add r6, r6, r5
376 add r10, r10, r5
377 add sp, sp, r5
378 dtb_check_done:
379 #endif
381 /*
382 * Check to see if we will overwrite ourselves.
383 * r4 = final kernel address (possibly with LSB set)
384 * r9 = size of decompressed image
385 * r10 = end of this image, including bss/stack/malloc space if non XIP
386 * We basically want:
387 * r4 - 16k page directory >= r10 -> OK
388 * r4 + image length <= address of wont_overwrite -> OK
389 * Note: the possible LSB in r4 is harmless here.
390 */
391 add r10, r10, #16384
392 cmp r4, r10
393 bhs wont_overwrite
394 add r10, r4, r9
395 adr r9, wont_overwrite
396 cmp r10, r9
397 bls wont_overwrite
399 /*
400 * Relocate ourselves past the end of the decompressed kernel.
401 * r6 = _edata
402 * r10 = end of the decompressed kernel
403 * Because we always copy ahead, we need to do it from the end and go
404 * backward in case the source and destination overlap.
405 */
406 /*
407 * Bump to the next 256-byte boundary with the size of
408 * the relocation code added. This avoids overwriting
409 * ourself when the offset is small.
410 */
411 add r10, r10, #((reloc_code_end - restart + 256) & ~255)
412 bic r10, r10, #255
414 /* Get start of code we want to copy and align it down. */
415 adr r5, restart
416 bic r5, r5, #31
418 /* Relocate the hyp vector base if necessary */
419 #ifdef CONFIG_ARM_VIRT_EXT
420 mrs r0, spsr
421 and r0, r0, #MODE_MASK
422 cmp r0, #HYP_MODE
423 bne 1f
425 bl __hyp_get_vectors
426 sub r0, r0, r5
427 add r0, r0, r10
428 bl __hyp_set_vectors
429 1:
430 #endif
432 sub r9, r6, r5 @ size to copy
433 add r9, r9, #31 @ rounded up to a multiple
434 bic r9, r9, #31 @ ... of 32 bytes
435 add r6, r9, r5
436 add r9, r9, r10
438 1: ldmdb r6!, {r0 - r3, r10 - r12, lr}
439 cmp r6, r5
440 stmdb r9!, {r0 - r3, r10 - r12, lr}
441 bhi 1b
443 /* Preserve offset to relocated code. */
444 sub r6, r9, r6
446 #ifndef CONFIG_ZBOOT_ROM
447 /* cache_clean_flush may use the stack, so relocate it */
448 add sp, sp, r6
449 #endif
451 bl cache_clean_flush
453 badr r0, restart
454 add r0, r0, r6
455 mov pc, r0
457 wont_overwrite:
458 /*
459 * If delta is zero, we are running at the address we were linked at.
460 * r0 = delta
461 * r2 = BSS start
462 * r3 = BSS end
463 * r4 = kernel execution address (possibly with LSB set)
464 * r5 = appended dtb size (0 if not present)
465 * r7 = architecture ID
466 * r8 = atags pointer
467 * r11 = GOT start
468 * r12 = GOT end
469 * sp = stack pointer
470 */
471 orrs r1, r0, r5
472 beq not_relocated
474 add r11, r11, r0
475 add r12, r12, r0
477 #ifndef CONFIG_ZBOOT_ROM
478 /*
479 * If we're running fully PIC === CONFIG_ZBOOT_ROM = n,
480 * we need to fix up pointers into the BSS region.
481 * Note that the stack pointer has already been fixed up.
482 */
483 add r2, r2, r0
484 add r3, r3, r0
486 /*
487 * Relocate all entries in the GOT table.
488 * Bump bss entries to _edata + dtb size
489 */
490 1: ldr r1, [r11, #0] @ relocate entries in the GOT
491 add r1, r1, r0 @ This fixes up C references
492 cmp r1, r2 @ if entry >= bss_start &&
493 cmphs r3, r1 @ bss_end > entry
494 addhi r1, r1, r5 @ entry += dtb size
495 str r1, [r11], #4 @ next entry
496 cmp r11, r12
497 blo 1b
499 /* bump our bss pointers too */
500 add r2, r2, r5
501 add r3, r3, r5
503 #else
505 /*
506 * Relocate entries in the GOT table. We only relocate
507 * the entries that are outside the (relocated) BSS region.
508 */
509 1: ldr r1, [r11, #0] @ relocate entries in the GOT
510 cmp r1, r2 @ entry < bss_start ||
511 cmphs r3, r1 @ _end < entry
512 addlo r1, r1, r0 @ table. This fixes up the
513 str r1, [r11], #4 @ C references.
514 cmp r11, r12
515 blo 1b
516 #endif
518 not_relocated: mov r0, #0
519 1: str r0, [r2], #4 @ clear bss
520 str r0, [r2], #4
521 str r0, [r2], #4
522 str r0, [r2], #4
523 cmp r2, r3
524 blo 1b
526 /*
527 * Did we skip the cache setup earlier?
528 * That is indicated by the LSB in r4.
529 * Do it now if so.
530 */
531 tst r4, #1
532 bic r4, r4, #1
533 blne cache_on
535 /*
536 * The C runtime environment should now be setup sufficiently.
537 * Set up some pointers, and start decompressing.
538 * r4 = kernel execution address
539 * r7 = architecture ID
540 * r8 = atags pointer
541 */
542 mov r0, r4
543 mov r1, sp @ malloc space above stack
544 add r2, sp, #0x10000 @ 64k max
545 mov r3, r7
546 bl decompress_kernel
547 bl cache_clean_flush
548 bl cache_off
549 mov r1, r7 @ restore architecture number
550 mov r2, r8 @ restore atags pointer
552 #ifdef CONFIG_ARM_VIRT_EXT
553 mrs r0, spsr @ Get saved CPU boot mode
554 and r0, r0, #MODE_MASK
555 cmp r0, #HYP_MODE @ if not booted in HYP mode...
556 bne __enter_kernel @ boot kernel directly
558 adr r12, .L__hyp_reentry_vectors_offset
559 ldr r0, [r12]
560 add r0, r0, r12
562 bl __hyp_set_vectors
563 __HVC(0) @ otherwise bounce to hyp mode
565 b . @ should never be reached
567 .align 2
568 .L__hyp_reentry_vectors_offset: .long __hyp_reentry_vectors - .
569 #else
570 b __enter_kernel
571 #endif
573 .align 2
574 .type LC0, #object
575 LC0: .word LC0 @ r1
576 .word __bss_start @ r2
577 .word _end @ r3
578 .word _edata @ r6
579 .word input_data_end - 4 @ r10 (inflated size location)
580 .word _got_start @ r11
581 .word _got_end @ ip
582 .word .L_user_stack_end @ sp
583 .word _end - restart + 16384 + 1024*1024
584 .size LC0, . - LC0
586 #ifdef CONFIG_ARCH_RPC
587 .globl params
588 params: ldr r0, =0x10000100 @ params_phys for RPC
589 mov pc, lr
590 .ltorg
591 .align
592 #endif
594 /*
595 * Turn on the cache. We need to setup some page tables so that we
596 * can have both the I and D caches on.
597 *
598 * We place the page tables 16k down from the kernel execution address,
599 * and we hope that nothing else is using it. If we're using it, we
600 * will go pop!
601 *
602 * On entry,
603 * r4 = kernel execution address
604 * r7 = architecture number
605 * r8 = atags pointer
606 * On exit,
607 * r0, r1, r2, r3, r9, r10, r12 corrupted
608 * This routine must preserve:
609 * r4, r7, r8
610 */
611 .align 5
612 cache_on: mov r3, #8 @ cache_on function
613 b call_cache_fn
615 /*
616 * Initialize the highest priority protection region, PR7
617 * to cover all 32bit address and cacheable and bufferable.
618 */
619 __armv4_mpu_cache_on:
620 mov r0, #0x3f @ 4G, the whole
621 mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting
622 mcr p15, 0, r0, c6, c7, 1
624 mov r0, #0x80 @ PR7
625 mcr p15, 0, r0, c2, c0, 0 @ D-cache on
626 mcr p15, 0, r0, c2, c0, 1 @ I-cache on
627 mcr p15, 0, r0, c3, c0, 0 @ write-buffer on
629 mov r0, #0xc000
630 mcr p15, 0, r0, c5, c0, 1 @ I-access permission
631 mcr p15, 0, r0, c5, c0, 0 @ D-access permission
633 mov r0, #0
634 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
635 mcr p15, 0, r0, c7, c5, 0 @ flush(inval) I-Cache
636 mcr p15, 0, r0, c7, c6, 0 @ flush(inval) D-Cache
637 mrc p15, 0, r0, c1, c0, 0 @ read control reg
638 @ ...I .... ..D. WC.M
639 orr r0, r0, #0x002d @ .... .... ..1. 11.1
640 orr r0, r0, #0x1000 @ ...1 .... .... ....
642 mcr p15, 0, r0, c1, c0, 0 @ write control reg
644 mov r0, #0
645 mcr p15, 0, r0, c7, c5, 0 @ flush(inval) I-Cache
646 mcr p15, 0, r0, c7, c6, 0 @ flush(inval) D-Cache
647 mov pc, lr
649 __armv3_mpu_cache_on:
650 mov r0, #0x3f @ 4G, the whole
651 mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting
653 mov r0, #0x80 @ PR7
654 mcr p15, 0, r0, c2, c0, 0 @ cache on
655 mcr p15, 0, r0, c3, c0, 0 @ write-buffer on
657 mov r0, #0xc000
658 mcr p15, 0, r0, c5, c0, 0 @ access permission
660 mov r0, #0
661 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
662 /*
663 * ?? ARMv3 MMU does not allow reading the control register,
664 * does this really work on ARMv3 MPU?
665 */
666 mrc p15, 0, r0, c1, c0, 0 @ read control reg
667 @ .... .... .... WC.M
668 orr r0, r0, #0x000d @ .... .... .... 11.1
669 /* ?? this overwrites the value constructed above? */
670 mov r0, #0
671 mcr p15, 0, r0, c1, c0, 0 @ write control reg
673 /* ?? invalidate for the second time? */
674 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
675 mov pc, lr
677 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
678 #define CB_BITS 0x08
679 #else
680 #define CB_BITS 0x0c
681 #endif
683 __setup_mmu: sub r3, r4, #16384 @ Page directory size
684 bic r3, r3, #0xff @ Align the pointer
685 bic r3, r3, #0x3f00
686 /*
687 * Initialise the page tables, turning on the cacheable and bufferable
688 * bits for the RAM area only.
689 */
690 mov r0, r3
691 mov r9, r0, lsr #18
692 mov r9, r9, lsl #18 @ start of RAM
693 add r10, r9, #0x10000000 @ a reasonable RAM size
694 mov r1, #0x12 @ XN|U + section mapping
695 orr r1, r1, #3 << 10 @ AP=11
696 add r2, r3, #16384
697 1: cmp r1, r9 @ if virt > start of RAM
698 cmphs r10, r1 @ && end of RAM > virt
699 bic r1, r1, #0x1c @ clear XN|U + C + B
700 orrlo r1, r1, #0x10 @ Set XN|U for non-RAM
701 orrhs r1, r1, r6 @ set RAM section settings
702 str r1, [r0], #4 @ 1:1 mapping
703 add r1, r1, #1048576
704 teq r0, r2
705 bne 1b
706 /*
707 * If ever we are running from Flash, then we surely want the cache
708 * to be enabled also for our execution instance... We map 2MB of it
709 * so there is no map overlap problem for up to 1 MB compressed kernel.
710 * If the execution is in RAM then we would only be duplicating the above.
711 */
712 orr r1, r6, #0x04 @ ensure B is set for this
713 orr r1, r1, #3 << 10
714 mov r2, pc
715 mov r2, r2, lsr #20
716 orr r1, r1, r2, lsl #20
717 add r0, r3, r2, lsl #2
718 str r1, [r0], #4
719 add r1, r1, #1048576
720 str r1, [r0]
721 mov pc, lr
722 ENDPROC(__setup_mmu)
724 @ Enable unaligned access on v6, to allow better code generation
725 @ for the decompressor C code:
726 __armv6_mmu_cache_on:
727 mrc p15, 0, r0, c1, c0, 0 @ read SCTLR
728 bic r0, r0, #2 @ A (no unaligned access fault)
729 orr r0, r0, #1 << 22 @ U (v6 unaligned access model)
730 mcr p15, 0, r0, c1, c0, 0 @ write SCTLR
731 b __armv4_mmu_cache_on
733 __arm926ejs_mmu_cache_on:
734 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
735 mov r0, #4 @ put dcache in WT mode
736 mcr p15, 7, r0, c15, c0, 0
737 #endif
739 __armv4_mmu_cache_on:
740 mov r12, lr
741 #ifdef CONFIG_MMU
742 mov r6, #CB_BITS | 0x12 @ U
743 bl __setup_mmu
744 mov r0, #0
745 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
746 mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
747 mrc p15, 0, r0, c1, c0, 0 @ read control reg
748 orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement
749 orr r0, r0, #0x0030
750 ARM_BE8( orr r0, r0, #1 << 25 ) @ big-endian page tables
751 bl __common_mmu_cache_on
752 mov r0, #0
753 mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
754 #endif
755 mov pc, r12
757 __armv7_mmu_cache_on:
758 mov r12, lr
759 #ifdef CONFIG_MMU
760 mrc p15, 0, r11, c0, c1, 4 @ read ID_MMFR0
761 tst r11, #0xf @ VMSA
762 movne r6, #CB_BITS | 0x02 @ !XN
763 blne __setup_mmu
764 mov r0, #0
765 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
766 tst r11, #0xf @ VMSA
767 mcrne p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
768 #endif
769 mrc p15, 0, r0, c1, c0, 0 @ read control reg
770 bic r0, r0, #1 << 28 @ clear SCTLR.TRE
771 orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement
772 orr r0, r0, #0x003c @ write buffer
773 bic r0, r0, #2 @ A (no unaligned access fault)
774 orr r0, r0, #1 << 22 @ U (v6 unaligned access model)
775 @ (needed for ARM1176)
776 #ifdef CONFIG_MMU
777 ARM_BE8( orr r0, r0, #1 << 25 ) @ big-endian page tables
778 mrcne p15, 0, r6, c2, c0, 2 @ read ttb control reg
779 orrne r0, r0, #1 @ MMU enabled
780 movne r1, #0xfffffffd @ domain 0 = client
781 bic r6, r6, #1 << 31 @ 32-bit translation system
782 bic r6, r6, #3 << 0 @ use only ttbr0
783 mcrne p15, 0, r3, c2, c0, 0 @ load page table pointer
784 mcrne p15, 0, r1, c3, c0, 0 @ load domain access control
785 mcrne p15, 0, r6, c2, c0, 2 @ load ttb control
786 #endif
787 mcr p15, 0, r0, c7, c5, 4 @ ISB
788 mcr p15, 0, r0, c1, c0, 0 @ load control register
789 mrc p15, 0, r0, c1, c0, 0 @ and read it back
790 mov r0, #0
791 mcr p15, 0, r0, c7, c5, 4 @ ISB
792 mov pc, r12
794 __fa526_cache_on:
795 mov r12, lr
796 mov r6, #CB_BITS | 0x12 @ U
797 bl __setup_mmu
798 mov r0, #0
799 mcr p15, 0, r0, c7, c7, 0 @ Invalidate whole cache
800 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
801 mcr p15, 0, r0, c8, c7, 0 @ flush UTLB
802 mrc p15, 0, r0, c1, c0, 0 @ read control reg
803 orr r0, r0, #0x1000 @ I-cache enable
804 bl __common_mmu_cache_on
805 mov r0, #0
806 mcr p15, 0, r0, c8, c7, 0 @ flush UTLB
807 mov pc, r12
809 __common_mmu_cache_on:
810 #ifndef CONFIG_THUMB2_KERNEL
811 #ifndef DEBUG
812 orr r0, r0, #0x000d @ Write buffer, mmu
813 #endif
814 mov r1, #-1
815 mcr p15, 0, r3, c2, c0, 0 @ load page table pointer
816 mcr p15, 0, r1, c3, c0, 0 @ load domain access control
817 b 1f
818 .align 5 @ cache line aligned
819 1: mcr p15, 0, r0, c1, c0, 0 @ load control register
820 mrc p15, 0, r0, c1, c0, 0 @ and read it back to
821 sub pc, lr, r0, lsr #32 @ properly flush pipeline
822 #endif
824 #define PROC_ENTRY_SIZE (4*5)
826 /*
827 * Here follow the relocatable cache support functions for the
828 * various processors. This is a generic hook for locating an
829 * entry and jumping to an instruction at the specified offset
830 * from the start of the block. Please note this is all position
831 * independent code.
832 *
833 * r1 = corrupted
834 * r2 = corrupted
835 * r3 = block offset
836 * r9 = corrupted
837 * r12 = corrupted
838 */
840 call_cache_fn: adr r12, proc_types
841 #ifdef CONFIG_CPU_CP15
842 mrc p15, 0, r9, c0, c0 @ get processor ID
843 #elif defined(CONFIG_CPU_V7M)
844 /*
845 * On v7-M the processor id is located in the V7M_SCB_CPUID
846 * register, but as cache handling is IMPLEMENTATION DEFINED on
847 * v7-M (if existant at all) we just return early here.
848 * If V7M_SCB_CPUID were used the cpu ID functions (i.e.
849 * __armv7_mmu_cache_{on,off,flush}) would be selected which
850 * use cp15 registers that are not implemented on v7-M.
851 */
852 bx lr
853 #else
854 ldr r9, =CONFIG_PROCESSOR_ID
855 #endif
856 1: ldr r1, [r12, #0] @ get value
857 ldr r2, [r12, #4] @ get mask
858 eor r1, r1, r9 @ (real ^ match)
859 tst r1, r2 @ & mask
860 ARM( addeq pc, r12, r3 ) @ call cache function
861 THUMB( addeq r12, r3 )
862 THUMB( moveq pc, r12 ) @ call cache function
863 add r12, r12, #PROC_ENTRY_SIZE
864 b 1b
866 /*
867 * Table for cache operations. This is basically:
868 * - CPU ID match
869 * - CPU ID mask
870 * - 'cache on' method instruction
871 * - 'cache off' method instruction
872 * - 'cache flush' method instruction
873 *
874 * We match an entry using: ((real_id ^ match) & mask) == 0
875 *
876 * Writethrough caches generally only need 'on' and 'off'
877 * methods. Writeback caches _must_ have the flush method
878 * defined.
879 */
880 .align 2
881 .type proc_types,#object
882 proc_types:
883 .word 0x41000000 @ old ARM ID
884 .word 0xff00f000
885 mov pc, lr
886 THUMB( nop )
887 mov pc, lr
888 THUMB( nop )
889 mov pc, lr
890 THUMB( nop )
892 .word 0x41007000 @ ARM7/710
893 .word 0xfff8fe00
894 mov pc, lr
895 THUMB( nop )
896 mov pc, lr
897 THUMB( nop )
898 mov pc, lr
899 THUMB( nop )
901 .word 0x41807200 @ ARM720T (writethrough)
902 .word 0xffffff00
903 W(b) __armv4_mmu_cache_on
904 W(b) __armv4_mmu_cache_off
905 mov pc, lr
906 THUMB( nop )
908 .word 0x41007400 @ ARM74x
909 .word 0xff00ff00
910 W(b) __armv3_mpu_cache_on
911 W(b) __armv3_mpu_cache_off
912 W(b) __armv3_mpu_cache_flush
914 .word 0x41009400 @ ARM94x
915 .word 0xff00ff00
916 W(b) __armv4_mpu_cache_on
917 W(b) __armv4_mpu_cache_off
918 W(b) __armv4_mpu_cache_flush
920 .word 0x41069260 @ ARM926EJ-S (v5TEJ)
921 .word 0xff0ffff0
922 W(b) __arm926ejs_mmu_cache_on
923 W(b) __armv4_mmu_cache_off
924 W(b) __armv5tej_mmu_cache_flush
926 .word 0x00007000 @ ARM7 IDs
927 .word 0x0000f000
928 mov pc, lr
929 THUMB( nop )
930 mov pc, lr
931 THUMB( nop )
932 mov pc, lr
933 THUMB( nop )
935 @ Everything from here on will be the new ID system.
937 .word 0x4401a100 @ sa110 / sa1100
938 .word 0xffffffe0
939 W(b) __armv4_mmu_cache_on
940 W(b) __armv4_mmu_cache_off
941 W(b) __armv4_mmu_cache_flush
943 .word 0x6901b110 @ sa1110
944 .word 0xfffffff0
945 W(b) __armv4_mmu_cache_on
946 W(b) __armv4_mmu_cache_off
947 W(b) __armv4_mmu_cache_flush
949 .word 0x56056900
950 .word 0xffffff00 @ PXA9xx
951 W(b) __armv4_mmu_cache_on
952 W(b) __armv4_mmu_cache_off
953 W(b) __armv4_mmu_cache_flush
955 .word 0x56158000 @ PXA168
956 .word 0xfffff000
957 W(b) __armv4_mmu_cache_on
958 W(b) __armv4_mmu_cache_off
959 W(b) __armv5tej_mmu_cache_flush
961 .word 0x56050000 @ Feroceon
962 .word 0xff0f0000
963 W(b) __armv4_mmu_cache_on
964 W(b) __armv4_mmu_cache_off
965 W(b) __armv5tej_mmu_cache_flush
967 #ifdef CONFIG_CPU_FEROCEON_OLD_ID
968 /* this conflicts with the standard ARMv5TE entry */
969 .long 0x41009260 @ Old Feroceon
970 .long 0xff00fff0
971 b __armv4_mmu_cache_on
972 b __armv4_mmu_cache_off
973 b __armv5tej_mmu_cache_flush
974 #endif
976 .word 0x66015261 @ FA526
977 .word 0xff01fff1
978 W(b) __fa526_cache_on
979 W(b) __armv4_mmu_cache_off
980 W(b) __fa526_cache_flush
982 @ These match on the architecture ID
984 .word 0x00020000 @ ARMv4T
985 .word 0x000f0000
986 W(b) __armv4_mmu_cache_on
987 W(b) __armv4_mmu_cache_off
988 W(b) __armv4_mmu_cache_flush
990 .word 0x00050000 @ ARMv5TE
991 .word 0x000f0000
992 W(b) __armv4_mmu_cache_on
993 W(b) __armv4_mmu_cache_off
994 W(b) __armv4_mmu_cache_flush
996 .word 0x00060000 @ ARMv5TEJ
997 .word 0x000f0000
998 W(b) __armv4_mmu_cache_on
999 W(b) __armv4_mmu_cache_off
1000 W(b) __armv5tej_mmu_cache_flush
1002 .word 0x0007b000 @ ARMv6
1003 .word 0x000ff000
1004 W(b) __armv6_mmu_cache_on
1005 W(b) __armv4_mmu_cache_off
1006 W(b) __armv6_mmu_cache_flush
1008 .word 0x000f0000 @ new CPU Id
1009 .word 0x000f0000
1010 W(b) __armv7_mmu_cache_on
1011 W(b) __armv7_mmu_cache_off
1012 W(b) __armv7_mmu_cache_flush
1014 .word 0 @ unrecognised type
1015 .word 0
1016 mov pc, lr
1017 THUMB( nop )
1018 mov pc, lr
1019 THUMB( nop )
1020 mov pc, lr
1021 THUMB( nop )
1023 .size proc_types, . - proc_types
1025 /*
1026 * If you get a "non-constant expression in ".if" statement"
1027 * error from the assembler on this line, check that you have
1028 * not accidentally written a "b" instruction where you should
1029 * have written W(b).
1030 */
1031 .if (. - proc_types) % PROC_ENTRY_SIZE != 0
1032 .error "The size of one or more proc_types entries is wrong."
1033 .endif
1035 /*
1036 * Turn off the Cache and MMU. ARMv3 does not support
1037 * reading the control register, but ARMv4 does.
1038 *
1039 * On exit,
1040 * r0, r1, r2, r3, r9, r12 corrupted
1041 * This routine must preserve:
1042 * r4, r7, r8
1043 */
1044 .align 5
1045 cache_off: mov r3, #12 @ cache_off function
1046 b call_cache_fn
1048 __armv4_mpu_cache_off:
1049 mrc p15, 0, r0, c1, c0
1050 bic r0, r0, #0x000d
1051 mcr p15, 0, r0, c1, c0 @ turn MPU and cache off
1052 mov r0, #0
1053 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
1054 mcr p15, 0, r0, c7, c6, 0 @ flush D-Cache
1055 mcr p15, 0, r0, c7, c5, 0 @ flush I-Cache
1056 mov pc, lr
1058 __armv3_mpu_cache_off:
1059 mrc p15, 0, r0, c1, c0
1060 bic r0, r0, #0x000d
1061 mcr p15, 0, r0, c1, c0, 0 @ turn MPU and cache off
1062 mov r0, #0
1063 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
1064 mov pc, lr
1066 __armv4_mmu_cache_off:
1067 #ifdef CONFIG_MMU
1068 mrc p15, 0, r0, c1, c0
1069 bic r0, r0, #0x000d
1070 mcr p15, 0, r0, c1, c0 @ turn MMU and cache off
1071 mov r0, #0
1072 mcr p15, 0, r0, c7, c7 @ invalidate whole cache v4
1073 mcr p15, 0, r0, c8, c7 @ invalidate whole TLB v4
1074 #endif
1075 mov pc, lr
1077 __armv7_mmu_cache_off:
1078 mrc p15, 0, r0, c1, c0
1079 #ifdef CONFIG_MMU
1080 bic r0, r0, #0x000d
1081 #else
1082 bic r0, r0, #0x000c
1083 #endif
1084 mcr p15, 0, r0, c1, c0 @ turn MMU and cache off
1085 mov r12, lr
1086 bl __armv7_mmu_cache_flush
1087 mov r0, #0
1088 #ifdef CONFIG_MMU
1089 mcr p15, 0, r0, c8, c7, 0 @ invalidate whole TLB
1090 #endif
1091 mcr p15, 0, r0, c7, c5, 6 @ invalidate BTC
1092 mcr p15, 0, r0, c7, c10, 4 @ DSB
1093 mcr p15, 0, r0, c7, c5, 4 @ ISB
1094 mov pc, r12
1096 /*
1097 * Clean and flush the cache to maintain consistency.
1098 *
1099 * On exit,
1100 * r1, r2, r3, r9, r10, r11, r12 corrupted
1101 * This routine must preserve:
1102 * r4, r6, r7, r8
1103 */
1104 .align 5
1105 cache_clean_flush:
1106 mov r3, #16
1107 b call_cache_fn
1109 __armv4_mpu_cache_flush:
1110 tst r4, #1
1111 movne pc, lr
1112 mov r2, #1
1113 mov r3, #0
1114 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
1115 mov r1, #7 << 5 @ 8 segments
1116 1: orr r3, r1, #63 << 26 @ 64 entries
1117 2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
1118 subs r3, r3, #1 << 26
1119 bcs 2b @ entries 63 to 0
1120 subs r1, r1, #1 << 5
1121 bcs 1b @ segments 7 to 0
1123 teq r2, #0
1124 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
1125 mcr p15, 0, ip, c7, c10, 4 @ drain WB
1126 mov pc, lr
1128 __fa526_cache_flush:
1129 tst r4, #1
1130 movne pc, lr
1131 mov r1, #0
1132 mcr p15, 0, r1, c7, c14, 0 @ clean and invalidate D cache
1133 mcr p15, 0, r1, c7, c5, 0 @ flush I cache
1134 mcr p15, 0, r1, c7, c10, 4 @ drain WB
1135 mov pc, lr
1137 __armv6_mmu_cache_flush:
1138 mov r1, #0
1139 tst r4, #1
1140 mcreq p15, 0, r1, c7, c14, 0 @ clean+invalidate D
1141 mcr p15, 0, r1, c7, c5, 0 @ invalidate I+BTB
1142 mcreq p15, 0, r1, c7, c15, 0 @ clean+invalidate unified
1143 mcr p15, 0, r1, c7, c10, 4 @ drain WB
1144 mov pc, lr
1146 __armv7_mmu_cache_flush:
1147 tst r4, #1
1148 bne iflush
1149 mrc p15, 0, r10, c0, c1, 5 @ read ID_MMFR1
1150 tst r10, #0xf << 16 @ hierarchical cache (ARMv7)
1151 mov r10, #0
1152 beq hierarchical
1153 mcr p15, 0, r10, c7, c14, 0 @ clean+invalidate D
1154 b iflush
1155 hierarchical:
1156 mcr p15, 0, r10, c7, c10, 5 @ DMB
1157 stmfd sp!, {r0-r7, r9-r11}
1158 mrc p15, 1, r0, c0, c0, 1 @ read clidr
1159 ands r3, r0, #0x7000000 @ extract loc from clidr
1160 mov r3, r3, lsr #23 @ left align loc bit field
1161 beq finished @ if loc is 0, then no need to clean
1162 mov r10, #0 @ start clean at cache level 0
1163 loop1:
1164 add r2, r10, r10, lsr #1 @ work out 3x current cache level
1165 mov r1, r0, lsr r2 @ extract cache type bits from clidr
1166 and r1, r1, #7 @ mask of the bits for current cache only
1167 cmp r1, #2 @ see what cache we have at this level
1168 blt skip @ skip if no cache, or just i-cache
1169 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
1170 mcr p15, 0, r10, c7, c5, 4 @ isb to sych the new cssr&csidr
1171 mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
1172 and r2, r1, #7 @ extract the length of the cache lines
1173 add r2, r2, #4 @ add 4 (line length offset)
1174 ldr r4, =0x3ff
1175 ands r4, r4, r1, lsr #3 @ find maximum number on the way size
1176 clz r5, r4 @ find bit position of way size increment
1177 ldr r7, =0x7fff
1178 ands r7, r7, r1, lsr #13 @ extract max number of the index size
1179 loop2:
1180 mov r9, r4 @ create working copy of max way size
1181 loop3:
1182 ARM( orr r11, r10, r9, lsl r5 ) @ factor way and cache number into r11
1183 ARM( orr r11, r11, r7, lsl r2 ) @ factor index number into r11
1184 THUMB( lsl r6, r9, r5 )
1185 THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11
1186 THUMB( lsl r6, r7, r2 )
1187 THUMB( orr r11, r11, r6 ) @ factor index number into r11
1188 mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
1189 subs r9, r9, #1 @ decrement the way
1190 bge loop3
1191 subs r7, r7, #1 @ decrement the index
1192 bge loop2
1193 skip:
1194 add r10, r10, #2 @ increment cache number
1195 cmp r3, r10
1196 bgt loop1
1197 finished:
1198 ldmfd sp!, {r0-r7, r9-r11}
1199 mov r10, #0 @ swith back to cache level 0
1200 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
1201 iflush:
1202 mcr p15, 0, r10, c7, c10, 4 @ DSB
1203 mcr p15, 0, r10, c7, c5, 0 @ invalidate I+BTB
1204 mcr p15, 0, r10, c7, c10, 4 @ DSB
1205 mcr p15, 0, r10, c7, c5, 4 @ ISB
1206 mov pc, lr
1208 __armv5tej_mmu_cache_flush:
1209 tst r4, #1
1210 movne pc, lr
1211 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate D cache
1212 bne 1b
1213 mcr p15, 0, r0, c7, c5, 0 @ flush I cache
1214 mcr p15, 0, r0, c7, c10, 4 @ drain WB
1215 mov pc, lr
1217 __armv4_mmu_cache_flush:
1218 tst r4, #1
1219 movne pc, lr
1220 mov r2, #64*1024 @ default: 32K dcache size (*2)
1221 mov r11, #32 @ default: 32 byte line size
1222 mrc p15, 0, r3, c0, c0, 1 @ read cache type
1223 teq r3, r9 @ cache ID register present?
1224 beq no_cache_id
1225 mov r1, r3, lsr #18
1226 and r1, r1, #7
1227 mov r2, #1024
1228 mov r2, r2, lsl r1 @ base dcache size *2
1229 tst r3, #1 << 14 @ test M bit
1230 addne r2, r2, r2, lsr #1 @ +1/2 size if M == 1
1231 mov r3, r3, lsr #12
1232 and r3, r3, #3
1233 mov r11, #8
1234 mov r11, r11, lsl r3 @ cache line size in bytes
1235 no_cache_id:
1236 mov r1, pc
1237 bic r1, r1, #63 @ align to longest cache line
1238 add r2, r1, r2
1239 1:
1240 ARM( ldr r3, [r1], r11 ) @ s/w flush D cache
1241 THUMB( ldr r3, [r1] ) @ s/w flush D cache
1242 THUMB( add r1, r1, r11 )
1243 teq r1, r2
1244 bne 1b
1246 mcr p15, 0, r1, c7, c5, 0 @ flush I cache
1247 mcr p15, 0, r1, c7, c6, 0 @ flush D cache
1248 mcr p15, 0, r1, c7, c10, 4 @ drain WB
1249 mov pc, lr
1251 __armv3_mmu_cache_flush:
1252 __armv3_mpu_cache_flush:
1253 tst r4, #1
1254 movne pc, lr
1255 mov r1, #0
1256 mcr p15, 0, r1, c7, c0, 0 @ invalidate whole cache v3
1257 mov pc, lr
1259 /*
1260 * Various debugging routines for printing hex characters and
1261 * memory, which again must be relocatable.
1262 */
1263 #ifdef DEBUG
1264 .align 2
1265 .type phexbuf,#object
1266 phexbuf: .space 12
1267 .size phexbuf, . - phexbuf
1269 @ phex corrupts {r0, r1, r2, r3}
1270 phex: adr r3, phexbuf
1271 mov r2, #0
1272 strb r2, [r3, r1]
1273 1: subs r1, r1, #1
1274 movmi r0, r3
1275 bmi puts
1276 and r2, r0, #15
1277 mov r0, r0, lsr #4
1278 cmp r2, #10
1279 addge r2, r2, #7
1280 add r2, r2, #'0'
1281 strb r2, [r3, r1]
1282 b 1b
1284 @ puts corrupts {r0, r1, r2, r3}
1285 puts: loadsp r3, r1
1286 1: ldrb r2, [r0], #1
1287 teq r2, #0
1288 moveq pc, lr
1289 2: writeb r2, r3
1290 mov r1, #0x00020000
1291 3: subs r1, r1, #1
1292 bne 3b
1293 teq r2, #'\n'
1294 moveq r2, #'\r'
1295 beq 2b
1296 teq r0, #0
1297 bne 1b
1298 mov pc, lr
1299 @ putc corrupts {r0, r1, r2, r3}
1300 putc:
1301 mov r2, r0
1302 mov r0, #0
1303 loadsp r3, r1
1304 b 2b
1306 @ memdump corrupts {r0, r1, r2, r3, r10, r11, r12, lr}
1307 memdump: mov r12, r0
1308 mov r10, lr
1309 mov r11, #0
1310 2: mov r0, r11, lsl #2
1311 add r0, r0, r12
1312 mov r1, #8
1313 bl phex
1314 mov r0, #':'
1315 bl putc
1316 1: mov r0, #' '
1317 bl putc
1318 ldr r0, [r12, r11, lsl #2]
1319 mov r1, #8
1320 bl phex
1321 and r0, r11, #7
1322 teq r0, #3
1323 moveq r0, #' '
1324 bleq putc
1325 and r0, r11, #7
1326 add r11, r11, #1
1327 teq r0, #7
1328 bne 1b
1329 mov r0, #'\n'
1330 bl putc
1331 cmp r11, #64
1332 blt 2b
1333 mov pc, r10
1334 #endif
1336 .ltorg
1338 #ifdef CONFIG_ARM_VIRT_EXT
1339 .align 5
1340 __hyp_reentry_vectors:
1341 W(b) . @ reset
1342 W(b) . @ undef
1343 W(b) . @ svc
1344 W(b) . @ pabort
1345 W(b) . @ dabort
1346 W(b) __enter_kernel @ hyp
1347 W(b) . @ irq
1348 W(b) . @ fiq
1349 #endif /* CONFIG_ARM_VIRT_EXT */
1351 __enter_kernel:
1352 mov r0, #0 @ must be 0
1353 ARM( mov pc, r4 ) @ call kernel
1354 M_CLASS( add r4, r4, #1 ) @ enter in Thumb mode for M class
1355 THUMB( bx r4 ) @ entry point is always ARM for A/R classes
1357 reloc_code_end:
1359 #ifdef CONFIG_EFI_STUB
1360 .align 2
1361 _start: .long start - .
1363 ENTRY(efi_stub_entry)
1364 @ allocate space on stack for passing current zImage address
1365 @ and for the EFI stub to return of new entry point of
1366 @ zImage, as EFI stub may copy the kernel. Pointer address
1367 @ is passed in r2. r0 and r1 are passed through from the
1368 @ EFI firmware to efi_entry
1369 adr ip, _start
1370 ldr r3, [ip]
1371 add r3, r3, ip
1372 stmfd sp!, {r3, lr}
1373 mov r2, sp @ pass zImage address in r2
1374 bl efi_entry
1376 @ Check for error return from EFI stub. r0 has FDT address
1377 @ or error code.
1378 cmn r0, #1
1379 beq efi_load_fail
1381 @ Preserve return value of efi_entry() in r4
1382 mov r4, r0
1383 bl cache_clean_flush
1384 bl cache_off
1386 @ Set parameters for booting zImage according to boot protocol
1387 @ put FDT address in r2, it was returned by efi_entry()
1388 @ r1 is the machine type, and r0 needs to be 0
1389 mov r0, #0
1390 mov r1, #0xFFFFFFFF
1391 mov r2, r4
1393 @ Branch to (possibly) relocated zImage that is in [sp]
1394 ldr lr, [sp]
1395 ldr ip, =start_offset
1396 add lr, lr, ip
1397 mov pc, lr @ no mode switch
1399 efi_load_fail:
1400 @ Return EFI_LOAD_ERROR to EFI firmware on error.
1401 ldr r0, =0x80000001
1402 ldmfd sp!, {ip, pc}
1403 ENDPROC(efi_stub_entry)
1404 #endif
1406 .align
1407 .section ".stack", "aw", %nobits
1408 .L_user_stack: .space 4096
1409 .L_user_stack_end: