Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[pandora-kernel.git] / arch / arm / boot / compressed / head.S
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
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
21
22 #if defined(CONFIG_DEBUG_ICEDCC)
23
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_V7)
31                 .macro  loadsp, rb
32                 .endm
33                 .macro  writeb, ch, rb
34 wait:           mrc     p14, 0, pc, c0, c1, 0
35                 bcs     wait
36                 mcr     p14, 0, \ch, c0, c5, 0
37                 .endm
38 #elif defined(CONFIG_CPU_XSCALE)
39                 .macro  loadsp, rb
40                 .endm
41                 .macro  writeb, ch, rb
42                 mcr     p14, 0, \ch, c8, c0, 0
43                 .endm
44 #else
45                 .macro  loadsp, rb
46                 .endm
47                 .macro  writeb, ch, rb
48                 mcr     p14, 0, \ch, c1, c0, 0
49                 .endm
50 #endif
51
52 #else
53
54 #include <mach/debug-macro.S>
55
56                 .macro  writeb, ch, rb
57                 senduart \ch, \rb
58                 .endm
59
60 #if defined(CONFIG_ARCH_SA1100)
61                 .macro  loadsp, rb
62                 mov     \rb, #0x80000000        @ physical base address
63 #ifdef CONFIG_DEBUG_LL_SER3
64                 add     \rb, \rb, #0x00050000   @ Ser3
65 #else
66                 add     \rb, \rb, #0x00010000   @ Ser1
67 #endif
68                 .endm
69 #elif defined(CONFIG_ARCH_S3C2410)
70                 .macro loadsp, rb
71                 mov     \rb, #0x50000000
72                 add     \rb, \rb, #0x4000 * CONFIG_S3C_LOWLEVEL_UART_PORT
73                 .endm
74 #else
75                 .macro  loadsp, rb
76                 addruart \rb
77                 .endm
78 #endif
79 #endif
80 #endif
81
82                 .macro  kputc,val
83                 mov     r0, \val
84                 bl      putc
85                 .endm
86
87                 .macro  kphex,val,len
88                 mov     r0, \val
89                 mov     r1, #\len
90                 bl      phex
91                 .endm
92
93                 .macro  debug_reloc_start
94 #ifdef DEBUG
95                 kputc   #'\n'
96                 kphex   r6, 8           /* processor id */
97                 kputc   #':'
98                 kphex   r7, 8           /* architecture id */
99 #ifdef CONFIG_CPU_CP15
100                 kputc   #':'
101                 mrc     p15, 0, r0, c1, c0
102                 kphex   r0, 8           /* control reg */
103 #endif
104                 kputc   #'\n'
105                 kphex   r5, 8           /* decompressed kernel start */
106                 kputc   #'-'
107                 kphex   r9, 8           /* decompressed kernel end  */
108                 kputc   #'>'
109                 kphex   r4, 8           /* kernel execution address */
110                 kputc   #'\n'
111 #endif
112                 .endm
113
114                 .macro  debug_reloc_end
115 #ifdef DEBUG
116                 kphex   r5, 8           /* end of kernel */
117                 kputc   #'\n'
118                 mov     r0, r4
119                 bl      memdump         /* dump 256 bytes at start of kernel */
120 #endif
121                 .endm
122
123                 .section ".start", #alloc, #execinstr
124 /*
125  * sort out different calling conventions
126  */
127                 .align
128 start:
129                 .type   start,#function
130                 .rept   8
131                 mov     r0, r0
132                 .endr
133
134                 b       1f
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
140
141 #ifndef __ARM_ARCH_2__
142                 /*
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.
146                  */
147                 mrs     r2, cpsr                @ get current mode
148                 tst     r2, #3                  @ not user?
149                 bne     not_angel
150                 mov     r0, #0x17               @ angel_SWIreason_EnterSVC
151  ARM(           swi     0x123456        )       @ angel_SWI_ARM
152  THUMB(         svc     0xab            )       @ angel_SWI_THUMB
153 not_angel:
154                 mrs     r2, cpsr                @ turn off interrupts to
155                 orr     r2, r2, #0xc0           @ prevent angel from running
156                 msr     cpsr_c, r2
157 #else
158                 teqp    pc, #0x0c000003         @ turn off interrupts
159 #endif
160
161                 /*
162                  * Note that some cache flushing and other stuff may
163                  * be needed here - is there an Angel SWI call for this?
164                  */
165
166                 /*
167                  * some architecture specific code can be inserted
168                  * by the linker here, but it should preserve r7, r8, and r9.
169                  */
170
171                 .text
172                 adr     r0, LC0
173  ARM(           ldmia   r0, {r1, r2, r3, r4, r5, r6, ip, sp}    )
174  THUMB(         ldmia   r0, {r1, r2, r3, r4, r5, r6, ip}        )
175  THUMB(         ldr     sp, [r0, #28]                           )
176                 subs    r0, r0, r1              @ calculate the delta offset
177
178                                                 @ if delta is zero, we are
179                 beq     not_relocated           @ running at the address we
180                                                 @ were linked at.
181
182                 /*
183                  * We're running at a different address.  We need to fix
184                  * up various pointers:
185                  *   r5 - zImage base address
186                  *   r6 - GOT start
187                  *   ip - GOT end
188                  */
189                 add     r5, r5, r0
190                 add     r6, r6, r0
191                 add     ip, ip, r0
192
193 #ifndef CONFIG_ZBOOT_ROM
194                 /*
195                  * If we're running fully PIC === CONFIG_ZBOOT_ROM = n,
196                  * we need to fix up pointers into the BSS region.
197                  *   r2 - BSS start
198                  *   r3 - BSS end
199                  *   sp - stack pointer
200                  */
201                 add     r2, r2, r0
202                 add     r3, r3, r0
203                 add     sp, sp, r0
204
205                 /*
206                  * Relocate all entries in the GOT table.
207                  */
208 1:              ldr     r1, [r6, #0]            @ relocate entries in the GOT
209                 add     r1, r1, r0              @ table.  This fixes up the
210                 str     r1, [r6], #4            @ C references.
211                 cmp     r6, ip
212                 blo     1b
213 #else
214
215                 /*
216                  * Relocate entries in the GOT table.  We only relocate
217                  * the entries that are outside the (relocated) BSS region.
218                  */
219 1:              ldr     r1, [r6, #0]            @ relocate entries in the GOT
220                 cmp     r1, r2                  @ entry < bss_start ||
221                 cmphs   r3, r1                  @ _end < entry
222                 addlo   r1, r1, r0              @ table.  This fixes up the
223                 str     r1, [r6], #4            @ C references.
224                 cmp     r6, ip
225                 blo     1b
226 #endif
227
228 not_relocated:  mov     r0, #0
229 1:              str     r0, [r2], #4            @ clear bss
230                 str     r0, [r2], #4
231                 str     r0, [r2], #4
232                 str     r0, [r2], #4
233                 cmp     r2, r3
234                 blo     1b
235
236                 /*
237                  * The C runtime environment should now be setup
238                  * sufficiently.  Turn the cache on, set up some
239                  * pointers, and start decompressing.
240                  */
241                 bl      cache_on
242
243                 mov     r1, sp                  @ malloc space above stack
244                 add     r2, sp, #0x10000        @ 64k max
245
246 /*
247  * Check to see if we will overwrite ourselves.
248  *   r4 = final kernel address
249  *   r5 = start of this image
250  *   r2 = end of malloc space (and therefore this image)
251  * We basically want:
252  *   r4 >= r2 -> OK
253  *   r4 + image length <= r5 -> OK
254  */
255                 cmp     r4, r2
256                 bhs     wont_overwrite
257                 sub     r3, sp, r5              @ > compressed kernel size
258                 add     r0, r4, r3, lsl #2      @ allow for 4x expansion
259                 cmp     r0, r5
260                 bls     wont_overwrite
261
262                 mov     r5, r2                  @ decompress after malloc space
263                 mov     r0, r5
264                 mov     r3, r7
265                 bl      decompress_kernel
266
267                 add     r0, r0, #127 + 128      @ alignment + stack
268                 bic     r0, r0, #127            @ align the kernel length
269 /*
270  * r0     = decompressed kernel length
271  * r1-r3  = unused
272  * r4     = kernel execution address
273  * r5     = decompressed kernel start
274  * r6     = processor ID
275  * r7     = architecture ID
276  * r8     = atags pointer
277  * r9-r12,r14 = corrupted
278  */
279                 add     r1, r5, r0              @ end of decompressed kernel
280                 adr     r2, reloc_start
281                 ldr     r3, LC1
282                 add     r3, r2, r3
283 1:              ldmia   r2!, {r9 - r12, r14}    @ copy relocation code
284                 stmia   r1!, {r9 - r12, r14}
285                 ldmia   r2!, {r9 - r12, r14}
286                 stmia   r1!, {r9 - r12, r14}
287                 cmp     r2, r3
288                 blo     1b
289                 mov     sp, r1
290                 add     sp, sp, #128            @ relocate the stack
291
292                 bl      cache_clean_flush
293  ARM(           add     pc, r5, r0              ) @ call relocation code
294  THUMB(         add     r12, r5, r0             )
295  THUMB(         mov     pc, r12                 ) @ call relocation code
296
297 /*
298  * We're not in danger of overwriting ourselves.  Do this the simple way.
299  *
300  * r4     = kernel execution address
301  * r7     = architecture ID
302  */
303 wont_overwrite: mov     r0, r4
304                 mov     r3, r7
305                 bl      decompress_kernel
306                 b       call_kernel
307
308                 .align  2
309                 .type   LC0, #object
310 LC0:            .word   LC0                     @ r1
311                 .word   __bss_start             @ r2
312                 .word   _end                    @ r3
313                 .word   zreladdr                @ r4
314                 .word   _start                  @ r5
315                 .word   _got_start              @ r6
316                 .word   _got_end                @ ip
317                 .word   user_stack+4096         @ sp
318 LC1:            .word   reloc_end - reloc_start
319                 .size   LC0, . - LC0
320
321 #ifdef CONFIG_ARCH_RPC
322                 .globl  params
323 params:         ldr     r0, =params_phys
324                 mov     pc, lr
325                 .ltorg
326                 .align
327 #endif
328
329 /*
330  * Turn on the cache.  We need to setup some page tables so that we
331  * can have both the I and D caches on.
332  *
333  * We place the page tables 16k down from the kernel execution address,
334  * and we hope that nothing else is using it.  If we're using it, we
335  * will go pop!
336  *
337  * On entry,
338  *  r4 = kernel execution address
339  *  r6 = processor ID
340  *  r7 = architecture number
341  *  r8 = atags pointer
342  *  r9 = run-time address of "start"  (???)
343  * On exit,
344  *  r1, r2, r3, r9, r10, r12 corrupted
345  * This routine must preserve:
346  *  r4, r5, r6, r7, r8
347  */
348                 .align  5
349 cache_on:       mov     r3, #8                  @ cache_on function
350                 b       call_cache_fn
351
352 /*
353  * Initialize the highest priority protection region, PR7
354  * to cover all 32bit address and cacheable and bufferable.
355  */
356 __armv4_mpu_cache_on:
357                 mov     r0, #0x3f               @ 4G, the whole
358                 mcr     p15, 0, r0, c6, c7, 0   @ PR7 Area Setting
359                 mcr     p15, 0, r0, c6, c7, 1
360
361                 mov     r0, #0x80               @ PR7
362                 mcr     p15, 0, r0, c2, c0, 0   @ D-cache on
363                 mcr     p15, 0, r0, c2, c0, 1   @ I-cache on
364                 mcr     p15, 0, r0, c3, c0, 0   @ write-buffer on
365
366                 mov     r0, #0xc000
367                 mcr     p15, 0, r0, c5, c0, 1   @ I-access permission
368                 mcr     p15, 0, r0, c5, c0, 0   @ D-access permission
369
370                 mov     r0, #0
371                 mcr     p15, 0, r0, c7, c10, 4  @ drain write buffer
372                 mcr     p15, 0, r0, c7, c5, 0   @ flush(inval) I-Cache
373                 mcr     p15, 0, r0, c7, c6, 0   @ flush(inval) D-Cache
374                 mrc     p15, 0, r0, c1, c0, 0   @ read control reg
375                                                 @ ...I .... ..D. WC.M
376                 orr     r0, r0, #0x002d         @ .... .... ..1. 11.1
377                 orr     r0, r0, #0x1000         @ ...1 .... .... ....
378
379                 mcr     p15, 0, r0, c1, c0, 0   @ write control reg
380
381                 mov     r0, #0
382                 mcr     p15, 0, r0, c7, c5, 0   @ flush(inval) I-Cache
383                 mcr     p15, 0, r0, c7, c6, 0   @ flush(inval) D-Cache
384                 mov     pc, lr
385
386 __armv3_mpu_cache_on:
387                 mov     r0, #0x3f               @ 4G, the whole
388                 mcr     p15, 0, r0, c6, c7, 0   @ PR7 Area Setting
389
390                 mov     r0, #0x80               @ PR7
391                 mcr     p15, 0, r0, c2, c0, 0   @ cache on
392                 mcr     p15, 0, r0, c3, c0, 0   @ write-buffer on
393
394                 mov     r0, #0xc000
395                 mcr     p15, 0, r0, c5, c0, 0   @ access permission
396
397                 mov     r0, #0
398                 mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
399                 mrc     p15, 0, r0, c1, c0, 0   @ read control reg
400                                                 @ .... .... .... WC.M
401                 orr     r0, r0, #0x000d         @ .... .... .... 11.1
402                 mov     r0, #0
403                 mcr     p15, 0, r0, c1, c0, 0   @ write control reg
404
405                 mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
406                 mov     pc, lr
407
408 __setup_mmu:    sub     r3, r4, #16384          @ Page directory size
409                 bic     r3, r3, #0xff           @ Align the pointer
410                 bic     r3, r3, #0x3f00
411 /*
412  * Initialise the page tables, turning on the cacheable and bufferable
413  * bits for the RAM area only.
414  */
415                 mov     r0, r3
416                 mov     r9, r0, lsr #18
417                 mov     r9, r9, lsl #18         @ start of RAM
418                 add     r10, r9, #0x10000000    @ a reasonable RAM size
419                 mov     r1, #0x12
420                 orr     r1, r1, #3 << 10
421                 add     r2, r3, #16384
422 1:              cmp     r1, r9                  @ if virt > start of RAM
423                 orrhs   r1, r1, #0x0c           @ set cacheable, bufferable
424                 cmp     r1, r10                 @ if virt > end of RAM
425                 bichs   r1, r1, #0x0c           @ clear cacheable, bufferable
426                 str     r1, [r0], #4            @ 1:1 mapping
427                 add     r1, r1, #1048576
428                 teq     r0, r2
429                 bne     1b
430 /*
431  * If ever we are running from Flash, then we surely want the cache
432  * to be enabled also for our execution instance...  We map 2MB of it
433  * so there is no map overlap problem for up to 1 MB compressed kernel.
434  * If the execution is in RAM then we would only be duplicating the above.
435  */
436                 mov     r1, #0x1e
437                 orr     r1, r1, #3 << 10
438                 mov     r2, pc, lsr #20
439                 orr     r1, r1, r2, lsl #20
440                 add     r0, r3, r2, lsl #2
441                 str     r1, [r0], #4
442                 add     r1, r1, #1048576
443                 str     r1, [r0]
444                 mov     pc, lr
445 ENDPROC(__setup_mmu)
446
447 __armv4_mmu_cache_on:
448                 mov     r12, lr
449 #ifdef CONFIG_MMU
450                 bl      __setup_mmu
451                 mov     r0, #0
452                 mcr     p15, 0, r0, c7, c10, 4  @ drain write buffer
453                 mcr     p15, 0, r0, c8, c7, 0   @ flush I,D TLBs
454                 mrc     p15, 0, r0, c1, c0, 0   @ read control reg
455                 orr     r0, r0, #0x5000         @ I-cache enable, RR cache replacement
456                 orr     r0, r0, #0x0030
457 #ifdef CONFIG_CPU_ENDIAN_BE8
458                 orr     r0, r0, #1 << 25        @ big-endian page tables
459 #endif
460                 bl      __common_mmu_cache_on
461                 mov     r0, #0
462                 mcr     p15, 0, r0, c8, c7, 0   @ flush I,D TLBs
463 #endif
464                 mov     pc, r12
465
466 __armv7_mmu_cache_on:
467                 mov     r12, lr
468 #ifdef CONFIG_MMU
469                 mrc     p15, 0, r11, c0, c1, 4  @ read ID_MMFR0
470                 tst     r11, #0xf               @ VMSA
471                 blne    __setup_mmu
472                 mov     r0, #0
473                 mcr     p15, 0, r0, c7, c10, 4  @ drain write buffer
474                 tst     r11, #0xf               @ VMSA
475                 mcrne   p15, 0, r0, c8, c7, 0   @ flush I,D TLBs
476 #endif
477                 mrc     p15, 0, r0, c1, c0, 0   @ read control reg
478                 orr     r0, r0, #0x5000         @ I-cache enable, RR cache replacement
479                 orr     r0, r0, #0x003c         @ write buffer
480 #ifdef CONFIG_MMU
481 #ifdef CONFIG_CPU_ENDIAN_BE8
482                 orr     r0, r0, #1 << 25        @ big-endian page tables
483 #endif
484                 orrne   r0, r0, #1              @ MMU enabled
485                 movne   r1, #-1
486                 mcrne   p15, 0, r3, c2, c0, 0   @ load page table pointer
487                 mcrne   p15, 0, r1, c3, c0, 0   @ load domain access control
488 #endif
489                 mcr     p15, 0, r0, c1, c0, 0   @ load control register
490                 mrc     p15, 0, r0, c1, c0, 0   @ and read it back
491                 mov     r0, #0
492                 mcr     p15, 0, r0, c7, c5, 4   @ ISB
493                 mov     pc, r12
494
495 __fa526_cache_on:
496                 mov     r12, lr
497                 bl      __setup_mmu
498                 mov     r0, #0
499                 mcr     p15, 0, r0, c7, c7, 0   @ Invalidate whole cache
500                 mcr     p15, 0, r0, c7, c10, 4  @ drain write buffer
501                 mcr     p15, 0, r0, c8, c7, 0   @ flush UTLB
502                 mrc     p15, 0, r0, c1, c0, 0   @ read control reg
503                 orr     r0, r0, #0x1000         @ I-cache enable
504                 bl      __common_mmu_cache_on
505                 mov     r0, #0
506                 mcr     p15, 0, r0, c8, c7, 0   @ flush UTLB
507                 mov     pc, r12
508
509 __arm6_mmu_cache_on:
510                 mov     r12, lr
511                 bl      __setup_mmu
512                 mov     r0, #0
513                 mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
514                 mcr     p15, 0, r0, c5, c0, 0   @ invalidate whole TLB v3
515                 mov     r0, #0x30
516                 bl      __common_mmu_cache_on
517                 mov     r0, #0
518                 mcr     p15, 0, r0, c5, c0, 0   @ invalidate whole TLB v3
519                 mov     pc, r12
520
521 __common_mmu_cache_on:
522 #ifndef CONFIG_THUMB2_KERNEL
523 #ifndef DEBUG
524                 orr     r0, r0, #0x000d         @ Write buffer, mmu
525 #endif
526                 mov     r1, #-1
527                 mcr     p15, 0, r3, c2, c0, 0   @ load page table pointer
528                 mcr     p15, 0, r1, c3, c0, 0   @ load domain access control
529                 b       1f
530                 .align  5                       @ cache line aligned
531 1:              mcr     p15, 0, r0, c1, c0, 0   @ load control register
532                 mrc     p15, 0, r0, c1, c0, 0   @ and read it back to
533                 sub     pc, lr, r0, lsr #32     @ properly flush pipeline
534 #endif
535
536 /*
537  * All code following this line is relocatable.  It is relocated by
538  * the above code to the end of the decompressed kernel image and
539  * executed there.  During this time, we have no stacks.
540  *
541  * r0     = decompressed kernel length
542  * r1-r3  = unused
543  * r4     = kernel execution address
544  * r5     = decompressed kernel start
545  * r6     = processor ID
546  * r7     = architecture ID
547  * r8     = atags pointer
548  * r9-r12,r14 = corrupted
549  */
550                 .align  5
551 reloc_start:    add     r9, r5, r0
552                 sub     r9, r9, #128            @ do not copy the stack
553                 debug_reloc_start
554                 mov     r1, r4
555 1:
556                 .rept   4
557                 ldmia   r5!, {r0, r2, r3, r10 - r12, r14}       @ relocate kernel
558                 stmia   r1!, {r0, r2, r3, r10 - r12, r14}
559                 .endr
560
561                 cmp     r5, r9
562                 blo     1b
563                 mov     sp, r1
564                 add     sp, sp, #128            @ relocate the stack
565                 debug_reloc_end
566
567 call_kernel:    bl      cache_clean_flush
568                 bl      cache_off
569                 mov     r0, #0                  @ must be zero
570                 mov     r1, r7                  @ restore architecture number
571                 mov     r2, r8                  @ restore atags pointer
572                 mov     pc, r4                  @ call kernel
573
574 /*
575  * Here follow the relocatable cache support functions for the
576  * various processors.  This is a generic hook for locating an
577  * entry and jumping to an instruction at the specified offset
578  * from the start of the block.  Please note this is all position
579  * independent code.
580  *
581  *  r1  = corrupted
582  *  r2  = corrupted
583  *  r3  = block offset
584  *  r6  = corrupted
585  *  r12 = corrupted
586  */
587
588 call_cache_fn:  adr     r12, proc_types
589 #ifdef CONFIG_CPU_CP15
590                 mrc     p15, 0, r6, c0, c0      @ get processor ID
591 #else
592                 ldr     r6, =CONFIG_PROCESSOR_ID
593 #endif
594 1:              ldr     r1, [r12, #0]           @ get value
595                 ldr     r2, [r12, #4]           @ get mask
596                 eor     r1, r1, r6              @ (real ^ match)
597                 tst     r1, r2                  @       & mask
598  ARM(           addeq   pc, r12, r3             ) @ call cache function
599  THUMB(         addeq   r12, r3                 )
600  THUMB(         moveq   pc, r12                 ) @ call cache function
601                 add     r12, r12, #4*5
602                 b       1b
603
604 /*
605  * Table for cache operations.  This is basically:
606  *   - CPU ID match
607  *   - CPU ID mask
608  *   - 'cache on' method instruction
609  *   - 'cache off' method instruction
610  *   - 'cache flush' method instruction
611  *
612  * We match an entry using: ((real_id ^ match) & mask) == 0
613  *
614  * Writethrough caches generally only need 'on' and 'off'
615  * methods.  Writeback caches _must_ have the flush method
616  * defined.
617  */
618                 .align  2
619                 .type   proc_types,#object
620 proc_types:
621                 .word   0x41560600              @ ARM6/610
622                 .word   0xffffffe0
623                 W(b)    __arm6_mmu_cache_off    @ works, but slow
624                 W(b)    __arm6_mmu_cache_off
625                 mov     pc, lr
626  THUMB(         nop                             )
627 @               b       __arm6_mmu_cache_on             @ untested
628 @               b       __arm6_mmu_cache_off
629 @               b       __armv3_mmu_cache_flush
630
631                 .word   0x00000000              @ old ARM ID
632                 .word   0x0000f000
633                 mov     pc, lr
634  THUMB(         nop                             )
635                 mov     pc, lr
636  THUMB(         nop                             )
637                 mov     pc, lr
638  THUMB(         nop                             )
639
640                 .word   0x41007000              @ ARM7/710
641                 .word   0xfff8fe00
642                 W(b)    __arm7_mmu_cache_off
643                 W(b)    __arm7_mmu_cache_off
644                 mov     pc, lr
645  THUMB(         nop                             )
646
647                 .word   0x41807200              @ ARM720T (writethrough)
648                 .word   0xffffff00
649                 W(b)    __armv4_mmu_cache_on
650                 W(b)    __armv4_mmu_cache_off
651                 mov     pc, lr
652  THUMB(         nop                             )
653
654                 .word   0x41007400              @ ARM74x
655                 .word   0xff00ff00
656                 W(b)    __armv3_mpu_cache_on
657                 W(b)    __armv3_mpu_cache_off
658                 W(b)    __armv3_mpu_cache_flush
659                 
660                 .word   0x41009400              @ ARM94x
661                 .word   0xff00ff00
662                 W(b)    __armv4_mpu_cache_on
663                 W(b)    __armv4_mpu_cache_off
664                 W(b)    __armv4_mpu_cache_flush
665
666                 .word   0x00007000              @ ARM7 IDs
667                 .word   0x0000f000
668                 mov     pc, lr
669  THUMB(         nop                             )
670                 mov     pc, lr
671  THUMB(         nop                             )
672                 mov     pc, lr
673  THUMB(         nop                             )
674
675                 @ Everything from here on will be the new ID system.
676
677                 .word   0x4401a100              @ sa110 / sa1100
678                 .word   0xffffffe0
679                 W(b)    __armv4_mmu_cache_on
680                 W(b)    __armv4_mmu_cache_off
681                 W(b)    __armv4_mmu_cache_flush
682
683                 .word   0x6901b110              @ sa1110
684                 .word   0xfffffff0
685                 W(b)    __armv4_mmu_cache_on
686                 W(b)    __armv4_mmu_cache_off
687                 W(b)    __armv4_mmu_cache_flush
688
689                 .word   0x56056930
690                 .word   0xff0ffff0              @ PXA935
691                 W(b)    __armv4_mmu_cache_on
692                 W(b)    __armv4_mmu_cache_off
693                 W(b)    __armv4_mmu_cache_flush
694
695                 .word   0x56158000              @ PXA168
696                 .word   0xfffff000
697                 W(b)    __armv4_mmu_cache_on
698                 W(b)    __armv4_mmu_cache_off
699                 W(b)    __armv5tej_mmu_cache_flush
700
701                 .word   0x56056930
702                 .word   0xff0ffff0              @ PXA935
703                 W(b)    __armv4_mmu_cache_on
704                 W(b)    __armv4_mmu_cache_off
705                 W(b)    __armv4_mmu_cache_flush
706
707                 .word   0x56050000              @ Feroceon
708                 .word   0xff0f0000
709                 W(b)    __armv4_mmu_cache_on
710                 W(b)    __armv4_mmu_cache_off
711                 W(b)    __armv5tej_mmu_cache_flush
712
713 #ifdef CONFIG_CPU_FEROCEON_OLD_ID
714                 /* this conflicts with the standard ARMv5TE entry */
715                 .long   0x41009260              @ Old Feroceon
716                 .long   0xff00fff0
717                 b       __armv4_mmu_cache_on
718                 b       __armv4_mmu_cache_off
719                 b       __armv5tej_mmu_cache_flush
720 #endif
721
722                 .word   0x66015261              @ FA526
723                 .word   0xff01fff1
724                 W(b)    __fa526_cache_on
725                 W(b)    __armv4_mmu_cache_off
726                 W(b)    __fa526_cache_flush
727
728                 @ These match on the architecture ID
729
730                 .word   0x00020000              @ ARMv4T
731                 .word   0x000f0000
732                 W(b)    __armv4_mmu_cache_on
733                 W(b)    __armv4_mmu_cache_off
734                 W(b)    __armv4_mmu_cache_flush
735
736                 .word   0x00050000              @ ARMv5TE
737                 .word   0x000f0000
738                 W(b)    __armv4_mmu_cache_on
739                 W(b)    __armv4_mmu_cache_off
740                 W(b)    __armv4_mmu_cache_flush
741
742                 .word   0x00060000              @ ARMv5TEJ
743                 .word   0x000f0000
744                 W(b)    __armv4_mmu_cache_on
745                 W(b)    __armv4_mmu_cache_off
746                 W(b)    __armv4_mmu_cache_flush
747
748                 .word   0x0007b000              @ ARMv6
749                 .word   0x000ff000
750                 W(b)    __armv4_mmu_cache_on
751                 W(b)    __armv4_mmu_cache_off
752                 W(b)    __armv6_mmu_cache_flush
753
754                 .word   0x560f5810              @ Marvell PJ4 ARMv6
755                 .word   0xff0ffff0
756                 W(b)    __armv4_mmu_cache_on
757                 W(b)    __armv4_mmu_cache_off
758                 W(b)    __armv6_mmu_cache_flush
759
760                 .word   0x000f0000              @ new CPU Id
761                 .word   0x000f0000
762                 W(b)    __armv7_mmu_cache_on
763                 W(b)    __armv7_mmu_cache_off
764                 W(b)    __armv7_mmu_cache_flush
765
766                 .word   0                       @ unrecognised type
767                 .word   0
768                 mov     pc, lr
769  THUMB(         nop                             )
770                 mov     pc, lr
771  THUMB(         nop                             )
772                 mov     pc, lr
773  THUMB(         nop                             )
774
775                 .size   proc_types, . - proc_types
776
777 /*
778  * Turn off the Cache and MMU.  ARMv3 does not support
779  * reading the control register, but ARMv4 does.
780  *
781  * On entry,  r6 = processor ID
782  * On exit,   r0, r1, r2, r3, r12 corrupted
783  * This routine must preserve: r4, r6, r7
784  */
785                 .align  5
786 cache_off:      mov     r3, #12                 @ cache_off function
787                 b       call_cache_fn
788
789 __armv4_mpu_cache_off:
790                 mrc     p15, 0, r0, c1, c0
791                 bic     r0, r0, #0x000d
792                 mcr     p15, 0, r0, c1, c0      @ turn MPU and cache off
793                 mov     r0, #0
794                 mcr     p15, 0, r0, c7, c10, 4  @ drain write buffer
795                 mcr     p15, 0, r0, c7, c6, 0   @ flush D-Cache
796                 mcr     p15, 0, r0, c7, c5, 0   @ flush I-Cache
797                 mov     pc, lr
798
799 __armv3_mpu_cache_off:
800                 mrc     p15, 0, r0, c1, c0
801                 bic     r0, r0, #0x000d
802                 mcr     p15, 0, r0, c1, c0, 0   @ turn MPU and cache off
803                 mov     r0, #0
804                 mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
805                 mov     pc, lr
806
807 __armv4_mmu_cache_off:
808 #ifdef CONFIG_MMU
809                 mrc     p15, 0, r0, c1, c0
810                 bic     r0, r0, #0x000d
811                 mcr     p15, 0, r0, c1, c0      @ turn MMU and cache off
812                 mov     r0, #0
813                 mcr     p15, 0, r0, c7, c7      @ invalidate whole cache v4
814                 mcr     p15, 0, r0, c8, c7      @ invalidate whole TLB v4
815 #endif
816                 mov     pc, lr
817
818 __armv7_mmu_cache_off:
819                 mrc     p15, 0, r0, c1, c0
820 #ifdef CONFIG_MMU
821                 bic     r0, r0, #0x000d
822 #else
823                 bic     r0, r0, #0x000c
824 #endif
825                 mcr     p15, 0, r0, c1, c0      @ turn MMU and cache off
826                 mov     r12, lr
827                 bl      __armv7_mmu_cache_flush
828                 mov     r0, #0
829 #ifdef CONFIG_MMU
830                 mcr     p15, 0, r0, c8, c7, 0   @ invalidate whole TLB
831 #endif
832                 mcr     p15, 0, r0, c7, c5, 6   @ invalidate BTC
833                 mcr     p15, 0, r0, c7, c10, 4  @ DSB
834                 mcr     p15, 0, r0, c7, c5, 4   @ ISB
835                 mov     pc, r12
836
837 __arm6_mmu_cache_off:
838                 mov     r0, #0x00000030         @ ARM6 control reg.
839                 b       __armv3_mmu_cache_off
840
841 __arm7_mmu_cache_off:
842                 mov     r0, #0x00000070         @ ARM7 control reg.
843                 b       __armv3_mmu_cache_off
844
845 __armv3_mmu_cache_off:
846                 mcr     p15, 0, r0, c1, c0, 0   @ turn MMU and cache off
847                 mov     r0, #0
848                 mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
849                 mcr     p15, 0, r0, c5, c0, 0   @ invalidate whole TLB v3
850                 mov     pc, lr
851
852 /*
853  * Clean and flush the cache to maintain consistency.
854  *
855  * On entry,
856  *  r6 = processor ID
857  * On exit,
858  *  r1, r2, r3, r11, r12 corrupted
859  * This routine must preserve:
860  *  r0, r4, r5, r6, r7
861  */
862                 .align  5
863 cache_clean_flush:
864                 mov     r3, #16
865                 b       call_cache_fn
866
867 __armv4_mpu_cache_flush:
868                 mov     r2, #1
869                 mov     r3, #0
870                 mcr     p15, 0, ip, c7, c6, 0   @ invalidate D cache
871                 mov     r1, #7 << 5             @ 8 segments
872 1:              orr     r3, r1, #63 << 26       @ 64 entries
873 2:              mcr     p15, 0, r3, c7, c14, 2  @ clean & invalidate D index
874                 subs    r3, r3, #1 << 26
875                 bcs     2b                      @ entries 63 to 0
876                 subs    r1, r1, #1 << 5
877                 bcs     1b                      @ segments 7 to 0
878
879                 teq     r2, #0
880                 mcrne   p15, 0, ip, c7, c5, 0   @ invalidate I cache
881                 mcr     p15, 0, ip, c7, c10, 4  @ drain WB
882                 mov     pc, lr
883                 
884 __fa526_cache_flush:
885                 mov     r1, #0
886                 mcr     p15, 0, r1, c7, c14, 0  @ clean and invalidate D cache
887                 mcr     p15, 0, r1, c7, c5, 0   @ flush I cache
888                 mcr     p15, 0, r1, c7, c10, 4  @ drain WB
889                 mov     pc, lr
890
891 __armv6_mmu_cache_flush:
892                 mov     r1, #0
893                 mcr     p15, 0, r1, c7, c14, 0  @ clean+invalidate D
894                 mcr     p15, 0, r1, c7, c5, 0   @ invalidate I+BTB
895                 mcr     p15, 0, r1, c7, c15, 0  @ clean+invalidate unified
896                 mcr     p15, 0, r1, c7, c10, 4  @ drain WB
897                 mov     pc, lr
898
899 __armv7_mmu_cache_flush:
900                 mrc     p15, 0, r10, c0, c1, 5  @ read ID_MMFR1
901                 tst     r10, #0xf << 16         @ hierarchical cache (ARMv7)
902                 mov     r10, #0
903                 beq     hierarchical
904                 mcr     p15, 0, r10, c7, c14, 0 @ clean+invalidate D
905                 b       iflush
906 hierarchical:
907                 mcr     p15, 0, r10, c7, c10, 5 @ DMB
908                 stmfd   sp!, {r0-r7, r9-r11}
909                 mrc     p15, 1, r0, c0, c0, 1   @ read clidr
910                 ands    r3, r0, #0x7000000      @ extract loc from clidr
911                 mov     r3, r3, lsr #23         @ left align loc bit field
912                 beq     finished                @ if loc is 0, then no need to clean
913                 mov     r10, #0                 @ start clean at cache level 0
914 loop1:
915                 add     r2, r10, r10, lsr #1    @ work out 3x current cache level
916                 mov     r1, r0, lsr r2          @ extract cache type bits from clidr
917                 and     r1, r1, #7              @ mask of the bits for current cache only
918                 cmp     r1, #2                  @ see what cache we have at this level
919                 blt     skip                    @ skip if no cache, or just i-cache
920                 mcr     p15, 2, r10, c0, c0, 0  @ select current cache level in cssr
921                 mcr     p15, 0, r10, c7, c5, 4  @ isb to sych the new cssr&csidr
922                 mrc     p15, 1, r1, c0, c0, 0   @ read the new csidr
923                 and     r2, r1, #7              @ extract the length of the cache lines
924                 add     r2, r2, #4              @ add 4 (line length offset)
925                 ldr     r4, =0x3ff
926                 ands    r4, r4, r1, lsr #3      @ find maximum number on the way size
927                 clz     r5, r4                  @ find bit position of way size increment
928                 ldr     r7, =0x7fff
929                 ands    r7, r7, r1, lsr #13     @ extract max number of the index size
930 loop2:
931                 mov     r9, r4                  @ create working copy of max way size
932 loop3:
933  ARM(           orr     r11, r10, r9, lsl r5    ) @ factor way and cache number into r11
934  ARM(           orr     r11, r11, r7, lsl r2    ) @ factor index number into r11
935  THUMB(         lsl     r6, r9, r5              )
936  THUMB(         orr     r11, r10, r6            ) @ factor way and cache number into r11
937  THUMB(         lsl     r6, r7, r2              )
938  THUMB(         orr     r11, r11, r6            ) @ factor index number into r11
939                 mcr     p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
940                 subs    r9, r9, #1              @ decrement the way
941                 bge     loop3
942                 subs    r7, r7, #1              @ decrement the index
943                 bge     loop2
944 skip:
945                 add     r10, r10, #2            @ increment cache number
946                 cmp     r3, r10
947                 bgt     loop1
948 finished:
949                 ldmfd   sp!, {r0-r7, r9-r11}
950                 mov     r10, #0                 @ swith back to cache level 0
951                 mcr     p15, 2, r10, c0, c0, 0  @ select current cache level in cssr
952 iflush:
953                 mcr     p15, 0, r10, c7, c10, 4 @ DSB
954                 mcr     p15, 0, r10, c7, c5, 0  @ invalidate I+BTB
955                 mcr     p15, 0, r10, c7, c10, 4 @ DSB
956                 mcr     p15, 0, r10, c7, c5, 4  @ ISB
957                 mov     pc, lr
958
959 __armv5tej_mmu_cache_flush:
960 1:              mrc     p15, 0, r15, c7, c14, 3 @ test,clean,invalidate D cache
961                 bne     1b
962                 mcr     p15, 0, r0, c7, c5, 0   @ flush I cache
963                 mcr     p15, 0, r0, c7, c10, 4  @ drain WB
964                 mov     pc, lr
965
966 __armv4_mmu_cache_flush:
967                 mov     r2, #64*1024            @ default: 32K dcache size (*2)
968                 mov     r11, #32                @ default: 32 byte line size
969                 mrc     p15, 0, r3, c0, c0, 1   @ read cache type
970                 teq     r3, r6                  @ cache ID register present?
971                 beq     no_cache_id
972                 mov     r1, r3, lsr #18
973                 and     r1, r1, #7
974                 mov     r2, #1024
975                 mov     r2, r2, lsl r1          @ base dcache size *2
976                 tst     r3, #1 << 14            @ test M bit
977                 addne   r2, r2, r2, lsr #1      @ +1/2 size if M == 1
978                 mov     r3, r3, lsr #12
979                 and     r3, r3, #3
980                 mov     r11, #8
981                 mov     r11, r11, lsl r3        @ cache line size in bytes
982 no_cache_id:
983                 mov     r1, pc
984                 bic     r1, r1, #63             @ align to longest cache line
985                 add     r2, r1, r2
986 1:
987  ARM(           ldr     r3, [r1], r11           ) @ s/w flush D cache
988  THUMB(         ldr     r3, [r1]                ) @ s/w flush D cache
989  THUMB(         add     r1, r1, r11             )
990                 teq     r1, r2
991                 bne     1b
992
993                 mcr     p15, 0, r1, c7, c5, 0   @ flush I cache
994                 mcr     p15, 0, r1, c7, c6, 0   @ flush D cache
995                 mcr     p15, 0, r1, c7, c10, 4  @ drain WB
996                 mov     pc, lr
997
998 __armv3_mmu_cache_flush:
999 __armv3_mpu_cache_flush:
1000                 mov     r1, #0
1001                 mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
1002                 mov     pc, lr
1003
1004 /*
1005  * Various debugging routines for printing hex characters and
1006  * memory, which again must be relocatable.
1007  */
1008 #ifdef DEBUG
1009                 .align  2
1010                 .type   phexbuf,#object
1011 phexbuf:        .space  12
1012                 .size   phexbuf, . - phexbuf
1013
1014 phex:           adr     r3, phexbuf
1015                 mov     r2, #0
1016                 strb    r2, [r3, r1]
1017 1:              subs    r1, r1, #1
1018                 movmi   r0, r3
1019                 bmi     puts
1020                 and     r2, r0, #15
1021                 mov     r0, r0, lsr #4
1022                 cmp     r2, #10
1023                 addge   r2, r2, #7
1024                 add     r2, r2, #'0'
1025                 strb    r2, [r3, r1]
1026                 b       1b
1027
1028 puts:           loadsp  r3
1029 1:              ldrb    r2, [r0], #1
1030                 teq     r2, #0
1031                 moveq   pc, lr
1032 2:              writeb  r2, r3
1033                 mov     r1, #0x00020000
1034 3:              subs    r1, r1, #1
1035                 bne     3b
1036                 teq     r2, #'\n'
1037                 moveq   r2, #'\r'
1038                 beq     2b
1039                 teq     r0, #0
1040                 bne     1b
1041                 mov     pc, lr
1042 putc:
1043                 mov     r2, r0
1044                 mov     r0, #0
1045                 loadsp  r3
1046                 b       2b
1047
1048 memdump:        mov     r12, r0
1049                 mov     r10, lr
1050                 mov     r11, #0
1051 2:              mov     r0, r11, lsl #2
1052                 add     r0, r0, r12
1053                 mov     r1, #8
1054                 bl      phex
1055                 mov     r0, #':'
1056                 bl      putc
1057 1:              mov     r0, #' '
1058                 bl      putc
1059                 ldr     r0, [r12, r11, lsl #2]
1060                 mov     r1, #8
1061                 bl      phex
1062                 and     r0, r11, #7
1063                 teq     r0, #3
1064                 moveq   r0, #' '
1065                 bleq    putc
1066                 and     r0, r11, #7
1067                 add     r11, r11, #1
1068                 teq     r0, #7
1069                 bne     1b
1070                 mov     r0, #'\n'
1071                 bl      putc
1072                 cmp     r11, #64
1073                 blt     2b
1074                 mov     pc, r10
1075 #endif
1076
1077                 .ltorg
1078 reloc_end:
1079
1080                 .align
1081                 .section ".stack", "w"
1082 user_stack:     .space  4096