Merge branch 'bkl-drivers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[sfrench/cifs-2.6.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_XSCALE)
31                 .macro  loadsp, rb
32                 .endm
33                 .macro  writeb, ch, rb
34                 mcr     p14, 0, \ch, c8, c0, 0
35                 .endm
36 #else
37                 .macro  loadsp, rb
38                 .endm
39                 .macro  writeb, ch, rb
40                 mcr     p14, 0, \ch, c1, c0, 0
41                 .endm
42 #endif
43
44 #else
45
46 #include <mach/debug-macro.S>
47
48                 .macro  writeb, ch, rb
49                 senduart \ch, \rb
50                 .endm
51
52 #if defined(CONFIG_ARCH_SA1100)
53                 .macro  loadsp, rb
54                 mov     \rb, #0x80000000        @ physical base address
55 #ifdef CONFIG_DEBUG_LL_SER3
56                 add     \rb, \rb, #0x00050000   @ Ser3
57 #else
58                 add     \rb, \rb, #0x00010000   @ Ser1
59 #endif
60                 .endm
61 #elif defined(CONFIG_ARCH_S3C2410)
62                 .macro loadsp, rb
63                 mov     \rb, #0x50000000
64                 add     \rb, \rb, #0x4000 * CONFIG_S3C_LOWLEVEL_UART_PORT
65                 .endm
66 #else
67                 .macro  loadsp, rb
68                 addruart \rb
69                 .endm
70 #endif
71 #endif
72 #endif
73
74                 .macro  kputc,val
75                 mov     r0, \val
76                 bl      putc
77                 .endm
78
79                 .macro  kphex,val,len
80                 mov     r0, \val
81                 mov     r1, #\len
82                 bl      phex
83                 .endm
84
85                 .macro  debug_reloc_start
86 #ifdef DEBUG
87                 kputc   #'\n'
88                 kphex   r6, 8           /* processor id */
89                 kputc   #':'
90                 kphex   r7, 8           /* architecture id */
91 #ifdef CONFIG_CPU_CP15
92                 kputc   #':'
93                 mrc     p15, 0, r0, c1, c0
94                 kphex   r0, 8           /* control reg */
95 #endif
96                 kputc   #'\n'
97                 kphex   r5, 8           /* decompressed kernel start */
98                 kputc   #'-'
99                 kphex   r9, 8           /* decompressed kernel end  */
100                 kputc   #'>'
101                 kphex   r4, 8           /* kernel execution address */
102                 kputc   #'\n'
103 #endif
104                 .endm
105
106                 .macro  debug_reloc_end
107 #ifdef DEBUG
108                 kphex   r5, 8           /* end of kernel */
109                 kputc   #'\n'
110                 mov     r0, r4
111                 bl      memdump         /* dump 256 bytes at start of kernel */
112 #endif
113                 .endm
114
115                 .section ".start", #alloc, #execinstr
116 /*
117  * sort out different calling conventions
118  */
119                 .align
120 start:
121                 .type   start,#function
122                 .rept   8
123                 mov     r0, r0
124                 .endr
125
126                 b       1f
127                 .word   0x016f2818              @ Magic numbers to help the loader
128                 .word   start                   @ absolute load/run zImage address
129                 .word   _edata                  @ zImage end address
130 1:              mov     r7, r1                  @ save architecture ID
131                 mov     r8, r2                  @ save atags pointer
132
133 #ifndef __ARM_ARCH_2__
134                 /*
135                  * Booting from Angel - need to enter SVC mode and disable
136                  * FIQs/IRQs (numeric definitions from angel arm.h source).
137                  * We only do this if we were in user mode on entry.
138                  */
139                 mrs     r2, cpsr                @ get current mode
140                 tst     r2, #3                  @ not user?
141                 bne     not_angel
142                 mov     r0, #0x17               @ angel_SWIreason_EnterSVC
143  ARM(           swi     0x123456        )       @ angel_SWI_ARM
144  THUMB(         svc     0xab            )       @ angel_SWI_THUMB
145 not_angel:
146                 mrs     r2, cpsr                @ turn off interrupts to
147                 orr     r2, r2, #0xc0           @ prevent angel from running
148                 msr     cpsr_c, r2
149 #else
150                 teqp    pc, #0x0c000003         @ turn off interrupts
151 #endif
152
153                 /*
154                  * Note that some cache flushing and other stuff may
155                  * be needed here - is there an Angel SWI call for this?
156                  */
157
158                 /*
159                  * some architecture specific code can be inserted
160                  * by the linker here, but it should preserve r7, r8, and r9.
161                  */
162
163                 .text
164                 adr     r0, LC0
165  ARM(           ldmia   r0, {r1, r2, r3, r4, r5, r6, ip, sp}    )
166  THUMB(         ldmia   r0, {r1, r2, r3, r4, r5, r6, ip}        )
167  THUMB(         ldr     sp, [r0, #28]                           )
168                 subs    r0, r0, r1              @ calculate the delta offset
169
170                                                 @ if delta is zero, we are
171                 beq     not_relocated           @ running at the address we
172                                                 @ were linked at.
173
174                 /*
175                  * We're running at a different address.  We need to fix
176                  * up various pointers:
177                  *   r5 - zImage base address
178                  *   r6 - GOT start
179                  *   ip - GOT end
180                  */
181                 add     r5, r5, r0
182                 add     r6, r6, r0
183                 add     ip, ip, r0
184
185 #ifndef CONFIG_ZBOOT_ROM
186                 /*
187                  * If we're running fully PIC === CONFIG_ZBOOT_ROM = n,
188                  * we need to fix up pointers into the BSS region.
189                  *   r2 - BSS start
190                  *   r3 - BSS end
191                  *   sp - stack pointer
192                  */
193                 add     r2, r2, r0
194                 add     r3, r3, r0
195                 add     sp, sp, r0
196
197                 /*
198                  * Relocate all entries in the GOT table.
199                  */
200 1:              ldr     r1, [r6, #0]            @ relocate entries in the GOT
201                 add     r1, r1, r0              @ table.  This fixes up the
202                 str     r1, [r6], #4            @ C references.
203                 cmp     r6, ip
204                 blo     1b
205 #else
206
207                 /*
208                  * Relocate entries in the GOT table.  We only relocate
209                  * the entries that are outside the (relocated) BSS region.
210                  */
211 1:              ldr     r1, [r6, #0]            @ relocate entries in the GOT
212                 cmp     r1, r2                  @ entry < bss_start ||
213                 cmphs   r3, r1                  @ _end < entry
214                 addlo   r1, r1, r0              @ table.  This fixes up the
215                 str     r1, [r6], #4            @ C references.
216                 cmp     r6, ip
217                 blo     1b
218 #endif
219
220 not_relocated:  mov     r0, #0
221 1:              str     r0, [r2], #4            @ clear bss
222                 str     r0, [r2], #4
223                 str     r0, [r2], #4
224                 str     r0, [r2], #4
225                 cmp     r2, r3
226                 blo     1b
227
228                 /*
229                  * The C runtime environment should now be setup
230                  * sufficiently.  Turn the cache on, set up some
231                  * pointers, and start decompressing.
232                  */
233                 bl      cache_on
234
235                 mov     r1, sp                  @ malloc space above stack
236                 add     r2, sp, #0x10000        @ 64k max
237
238 /*
239  * Check to see if we will overwrite ourselves.
240  *   r4 = final kernel address
241  *   r5 = start of this image
242  *   r2 = end of malloc space (and therefore this image)
243  * We basically want:
244  *   r4 >= r2 -> OK
245  *   r4 + image length <= r5 -> OK
246  */
247                 cmp     r4, r2
248                 bhs     wont_overwrite
249                 sub     r3, sp, r5              @ > compressed kernel size
250                 add     r0, r4, r3, lsl #2      @ allow for 4x expansion
251                 cmp     r0, r5
252                 bls     wont_overwrite
253
254                 mov     r5, r2                  @ decompress after malloc space
255                 mov     r0, r5
256                 mov     r3, r7
257                 bl      decompress_kernel
258
259                 add     r0, r0, #127 + 128      @ alignment + stack
260                 bic     r0, r0, #127            @ align the kernel length
261 /*
262  * r0     = decompressed kernel length
263  * r1-r3  = unused
264  * r4     = kernel execution address
265  * r5     = decompressed kernel start
266  * r6     = processor ID
267  * r7     = architecture ID
268  * r8     = atags pointer
269  * r9-r12,r14 = corrupted
270  */
271                 add     r1, r5, r0              @ end of decompressed kernel
272                 adr     r2, reloc_start
273                 ldr     r3, LC1
274                 add     r3, r2, r3
275 1:              ldmia   r2!, {r9 - r12, r14}    @ copy relocation code
276                 stmia   r1!, {r9 - r12, r14}
277                 ldmia   r2!, {r9 - r12, r14}
278                 stmia   r1!, {r9 - r12, r14}
279                 cmp     r2, r3
280                 blo     1b
281                 mov     sp, r1
282                 add     sp, sp, #128            @ relocate the stack
283
284                 bl      cache_clean_flush
285  ARM(           add     pc, r5, r0              ) @ call relocation code
286  THUMB(         add     r12, r5, r0             )
287  THUMB(         mov     pc, r12                 ) @ call relocation code
288
289 /*
290  * We're not in danger of overwriting ourselves.  Do this the simple way.
291  *
292  * r4     = kernel execution address
293  * r7     = architecture ID
294  */
295 wont_overwrite: mov     r0, r4
296                 mov     r3, r7
297                 bl      decompress_kernel
298                 b       call_kernel
299
300                 .align  2
301                 .type   LC0, #object
302 LC0:            .word   LC0                     @ r1
303                 .word   __bss_start             @ r2
304                 .word   _end                    @ r3
305                 .word   zreladdr                @ r4
306                 .word   _start                  @ r5
307                 .word   _got_start              @ r6
308                 .word   _got_end                @ ip
309                 .word   user_stack+4096         @ sp
310 LC1:            .word   reloc_end - reloc_start
311                 .size   LC0, . - LC0
312
313 #ifdef CONFIG_ARCH_RPC
314                 .globl  params
315 params:         ldr     r0, =params_phys
316                 mov     pc, lr
317                 .ltorg
318                 .align
319 #endif
320
321 /*
322  * Turn on the cache.  We need to setup some page tables so that we
323  * can have both the I and D caches on.
324  *
325  * We place the page tables 16k down from the kernel execution address,
326  * and we hope that nothing else is using it.  If we're using it, we
327  * will go pop!
328  *
329  * On entry,
330  *  r4 = kernel execution address
331  *  r6 = processor ID
332  *  r7 = architecture number
333  *  r8 = atags pointer
334  *  r9 = run-time address of "start"  (???)
335  * On exit,
336  *  r1, r2, r3, r9, r10, r12 corrupted
337  * This routine must preserve:
338  *  r4, r5, r6, r7, r8
339  */
340                 .align  5
341 cache_on:       mov     r3, #8                  @ cache_on function
342                 b       call_cache_fn
343
344 /*
345  * Initialize the highest priority protection region, PR7
346  * to cover all 32bit address and cacheable and bufferable.
347  */
348 __armv4_mpu_cache_on:
349                 mov     r0, #0x3f               @ 4G, the whole
350                 mcr     p15, 0, r0, c6, c7, 0   @ PR7 Area Setting
351                 mcr     p15, 0, r0, c6, c7, 1
352
353                 mov     r0, #0x80               @ PR7
354                 mcr     p15, 0, r0, c2, c0, 0   @ D-cache on
355                 mcr     p15, 0, r0, c2, c0, 1   @ I-cache on
356                 mcr     p15, 0, r0, c3, c0, 0   @ write-buffer on
357
358                 mov     r0, #0xc000
359                 mcr     p15, 0, r0, c5, c0, 1   @ I-access permission
360                 mcr     p15, 0, r0, c5, c0, 0   @ D-access permission
361
362                 mov     r0, #0
363                 mcr     p15, 0, r0, c7, c10, 4  @ drain write buffer
364                 mcr     p15, 0, r0, c7, c5, 0   @ flush(inval) I-Cache
365                 mcr     p15, 0, r0, c7, c6, 0   @ flush(inval) D-Cache
366                 mrc     p15, 0, r0, c1, c0, 0   @ read control reg
367                                                 @ ...I .... ..D. WC.M
368                 orr     r0, r0, #0x002d         @ .... .... ..1. 11.1
369                 orr     r0, r0, #0x1000         @ ...1 .... .... ....
370
371                 mcr     p15, 0, r0, c1, c0, 0   @ write control reg
372
373                 mov     r0, #0
374                 mcr     p15, 0, r0, c7, c5, 0   @ flush(inval) I-Cache
375                 mcr     p15, 0, r0, c7, c6, 0   @ flush(inval) D-Cache
376                 mov     pc, lr
377
378 __armv3_mpu_cache_on:
379                 mov     r0, #0x3f               @ 4G, the whole
380                 mcr     p15, 0, r0, c6, c7, 0   @ PR7 Area Setting
381
382                 mov     r0, #0x80               @ PR7
383                 mcr     p15, 0, r0, c2, c0, 0   @ cache on
384                 mcr     p15, 0, r0, c3, c0, 0   @ write-buffer on
385
386                 mov     r0, #0xc000
387                 mcr     p15, 0, r0, c5, c0, 0   @ access permission
388
389                 mov     r0, #0
390                 mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
391                 mrc     p15, 0, r0, c1, c0, 0   @ read control reg
392                                                 @ .... .... .... WC.M
393                 orr     r0, r0, #0x000d         @ .... .... .... 11.1
394                 mov     r0, #0
395                 mcr     p15, 0, r0, c1, c0, 0   @ write control reg
396
397                 mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
398                 mov     pc, lr
399
400 __setup_mmu:    sub     r3, r4, #16384          @ Page directory size
401                 bic     r3, r3, #0xff           @ Align the pointer
402                 bic     r3, r3, #0x3f00
403 /*
404  * Initialise the page tables, turning on the cacheable and bufferable
405  * bits for the RAM area only.
406  */
407                 mov     r0, r3
408                 mov     r9, r0, lsr #18
409                 mov     r9, r9, lsl #18         @ start of RAM
410                 add     r10, r9, #0x10000000    @ a reasonable RAM size
411                 mov     r1, #0x12
412                 orr     r1, r1, #3 << 10
413                 add     r2, r3, #16384
414 1:              cmp     r1, r9                  @ if virt > start of RAM
415                 orrhs   r1, r1, #0x0c           @ set cacheable, bufferable
416                 cmp     r1, r10                 @ if virt > end of RAM
417                 bichs   r1, r1, #0x0c           @ clear cacheable, bufferable
418                 str     r1, [r0], #4            @ 1:1 mapping
419                 add     r1, r1, #1048576
420                 teq     r0, r2
421                 bne     1b
422 /*
423  * If ever we are running from Flash, then we surely want the cache
424  * to be enabled also for our execution instance...  We map 2MB of it
425  * so there is no map overlap problem for up to 1 MB compressed kernel.
426  * If the execution is in RAM then we would only be duplicating the above.
427  */
428                 mov     r1, #0x1e
429                 orr     r1, r1, #3 << 10
430                 mov     r2, pc, lsr #20
431                 orr     r1, r1, r2, lsl #20
432                 add     r0, r3, r2, lsl #2
433                 str     r1, [r0], #4
434                 add     r1, r1, #1048576
435                 str     r1, [r0]
436                 mov     pc, lr
437 ENDPROC(__setup_mmu)
438
439 __armv4_mmu_cache_on:
440                 mov     r12, lr
441 #ifdef CONFIG_MMU
442                 bl      __setup_mmu
443                 mov     r0, #0
444                 mcr     p15, 0, r0, c7, c10, 4  @ drain write buffer
445                 mcr     p15, 0, r0, c8, c7, 0   @ flush I,D TLBs
446                 mrc     p15, 0, r0, c1, c0, 0   @ read control reg
447                 orr     r0, r0, #0x5000         @ I-cache enable, RR cache replacement
448                 orr     r0, r0, #0x0030
449 #ifdef CONFIG_CPU_ENDIAN_BE8
450                 orr     r0, r0, #1 << 25        @ big-endian page tables
451 #endif
452                 bl      __common_mmu_cache_on
453                 mov     r0, #0
454                 mcr     p15, 0, r0, c8, c7, 0   @ flush I,D TLBs
455 #endif
456                 mov     pc, r12
457
458 __armv7_mmu_cache_on:
459                 mov     r12, lr
460 #ifdef CONFIG_MMU
461                 mrc     p15, 0, r11, c0, c1, 4  @ read ID_MMFR0
462                 tst     r11, #0xf               @ VMSA
463                 blne    __setup_mmu
464                 mov     r0, #0
465                 mcr     p15, 0, r0, c7, c10, 4  @ drain write buffer
466                 tst     r11, #0xf               @ VMSA
467                 mcrne   p15, 0, r0, c8, c7, 0   @ flush I,D TLBs
468 #endif
469                 mrc     p15, 0, r0, c1, c0, 0   @ read control reg
470                 orr     r0, r0, #0x5000         @ I-cache enable, RR cache replacement
471                 orr     r0, r0, #0x003c         @ write buffer
472 #ifdef CONFIG_MMU
473 #ifdef CONFIG_CPU_ENDIAN_BE8
474                 orr     r0, r0, #1 << 25        @ big-endian page tables
475 #endif
476                 orrne   r0, r0, #1              @ MMU enabled
477                 movne   r1, #-1
478                 mcrne   p15, 0, r3, c2, c0, 0   @ load page table pointer
479                 mcrne   p15, 0, r1, c3, c0, 0   @ load domain access control
480 #endif
481                 mcr     p15, 0, r0, c1, c0, 0   @ load control register
482                 mrc     p15, 0, r0, c1, c0, 0   @ and read it back
483                 mov     r0, #0
484                 mcr     p15, 0, r0, c7, c5, 4   @ ISB
485                 mov     pc, r12
486
487 __fa526_cache_on:
488                 mov     r12, lr
489                 bl      __setup_mmu
490                 mov     r0, #0
491                 mcr     p15, 0, r0, c7, c7, 0   @ Invalidate whole cache
492                 mcr     p15, 0, r0, c7, c10, 4  @ drain write buffer
493                 mcr     p15, 0, r0, c8, c7, 0   @ flush UTLB
494                 mrc     p15, 0, r0, c1, c0, 0   @ read control reg
495                 orr     r0, r0, #0x1000         @ I-cache enable
496                 bl      __common_mmu_cache_on
497                 mov     r0, #0
498                 mcr     p15, 0, r0, c8, c7, 0   @ flush UTLB
499                 mov     pc, r12
500
501 __arm6_mmu_cache_on:
502                 mov     r12, lr
503                 bl      __setup_mmu
504                 mov     r0, #0
505                 mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
506                 mcr     p15, 0, r0, c5, c0, 0   @ invalidate whole TLB v3
507                 mov     r0, #0x30
508                 bl      __common_mmu_cache_on
509                 mov     r0, #0
510                 mcr     p15, 0, r0, c5, c0, 0   @ invalidate whole TLB v3
511                 mov     pc, r12
512
513 __common_mmu_cache_on:
514 #ifndef CONFIG_THUMB2_KERNEL
515 #ifndef DEBUG
516                 orr     r0, r0, #0x000d         @ Write buffer, mmu
517 #endif
518                 mov     r1, #-1
519                 mcr     p15, 0, r3, c2, c0, 0   @ load page table pointer
520                 mcr     p15, 0, r1, c3, c0, 0   @ load domain access control
521                 b       1f
522                 .align  5                       @ cache line aligned
523 1:              mcr     p15, 0, r0, c1, c0, 0   @ load control register
524                 mrc     p15, 0, r0, c1, c0, 0   @ and read it back to
525                 sub     pc, lr, r0, lsr #32     @ properly flush pipeline
526 #endif
527
528 /*
529  * All code following this line is relocatable.  It is relocated by
530  * the above code to the end of the decompressed kernel image and
531  * executed there.  During this time, we have no stacks.
532  *
533  * r0     = decompressed kernel length
534  * r1-r3  = unused
535  * r4     = kernel execution address
536  * r5     = decompressed kernel start
537  * r6     = processor ID
538  * r7     = architecture ID
539  * r8     = atags pointer
540  * r9-r12,r14 = corrupted
541  */
542                 .align  5
543 reloc_start:    add     r9, r5, r0
544                 sub     r9, r9, #128            @ do not copy the stack
545                 debug_reloc_start
546                 mov     r1, r4
547 1:
548                 .rept   4
549                 ldmia   r5!, {r0, r2, r3, r10 - r12, r14}       @ relocate kernel
550                 stmia   r1!, {r0, r2, r3, r10 - r12, r14}
551                 .endr
552
553                 cmp     r5, r9
554                 blo     1b
555                 mov     sp, r1
556                 add     sp, sp, #128            @ relocate the stack
557                 debug_reloc_end
558
559 call_kernel:    bl      cache_clean_flush
560                 bl      cache_off
561                 mov     r0, #0                  @ must be zero
562                 mov     r1, r7                  @ restore architecture number
563                 mov     r2, r8                  @ restore atags pointer
564                 mov     pc, r4                  @ call kernel
565
566 /*
567  * Here follow the relocatable cache support functions for the
568  * various processors.  This is a generic hook for locating an
569  * entry and jumping to an instruction at the specified offset
570  * from the start of the block.  Please note this is all position
571  * independent code.
572  *
573  *  r1  = corrupted
574  *  r2  = corrupted
575  *  r3  = block offset
576  *  r6  = corrupted
577  *  r12 = corrupted
578  */
579
580 call_cache_fn:  adr     r12, proc_types
581 #ifdef CONFIG_CPU_CP15
582                 mrc     p15, 0, r6, c0, c0      @ get processor ID
583 #else
584                 ldr     r6, =CONFIG_PROCESSOR_ID
585 #endif
586 1:              ldr     r1, [r12, #0]           @ get value
587                 ldr     r2, [r12, #4]           @ get mask
588                 eor     r1, r1, r6              @ (real ^ match)
589                 tst     r1, r2                  @       & mask
590  ARM(           addeq   pc, r12, r3             ) @ call cache function
591  THUMB(         addeq   r12, r3                 )
592  THUMB(         moveq   pc, r12                 ) @ call cache function
593                 add     r12, r12, #4*5
594                 b       1b
595
596 /*
597  * Table for cache operations.  This is basically:
598  *   - CPU ID match
599  *   - CPU ID mask
600  *   - 'cache on' method instruction
601  *   - 'cache off' method instruction
602  *   - 'cache flush' method instruction
603  *
604  * We match an entry using: ((real_id ^ match) & mask) == 0
605  *
606  * Writethrough caches generally only need 'on' and 'off'
607  * methods.  Writeback caches _must_ have the flush method
608  * defined.
609  */
610                 .align  2
611                 .type   proc_types,#object
612 proc_types:
613                 .word   0x41560600              @ ARM6/610
614                 .word   0xffffffe0
615                 W(b)    __arm6_mmu_cache_off    @ works, but slow
616                 W(b)    __arm6_mmu_cache_off
617                 mov     pc, lr
618  THUMB(         nop                             )
619 @               b       __arm6_mmu_cache_on             @ untested
620 @               b       __arm6_mmu_cache_off
621 @               b       __armv3_mmu_cache_flush
622
623                 .word   0x00000000              @ old ARM ID
624                 .word   0x0000f000
625                 mov     pc, lr
626  THUMB(         nop                             )
627                 mov     pc, lr
628  THUMB(         nop                             )
629                 mov     pc, lr
630  THUMB(         nop                             )
631
632                 .word   0x41007000              @ ARM7/710
633                 .word   0xfff8fe00
634                 W(b)    __arm7_mmu_cache_off
635                 W(b)    __arm7_mmu_cache_off
636                 mov     pc, lr
637  THUMB(         nop                             )
638
639                 .word   0x41807200              @ ARM720T (writethrough)
640                 .word   0xffffff00
641                 W(b)    __armv4_mmu_cache_on
642                 W(b)    __armv4_mmu_cache_off
643                 mov     pc, lr
644  THUMB(         nop                             )
645
646                 .word   0x41007400              @ ARM74x
647                 .word   0xff00ff00
648                 W(b)    __armv3_mpu_cache_on
649                 W(b)    __armv3_mpu_cache_off
650                 W(b)    __armv3_mpu_cache_flush
651                 
652                 .word   0x41009400              @ ARM94x
653                 .word   0xff00ff00
654                 W(b)    __armv4_mpu_cache_on
655                 W(b)    __armv4_mpu_cache_off
656                 W(b)    __armv4_mpu_cache_flush
657
658                 .word   0x00007000              @ ARM7 IDs
659                 .word   0x0000f000
660                 mov     pc, lr
661  THUMB(         nop                             )
662                 mov     pc, lr
663  THUMB(         nop                             )
664                 mov     pc, lr
665  THUMB(         nop                             )
666
667                 @ Everything from here on will be the new ID system.
668
669                 .word   0x4401a100              @ sa110 / sa1100
670                 .word   0xffffffe0
671                 W(b)    __armv4_mmu_cache_on
672                 W(b)    __armv4_mmu_cache_off
673                 W(b)    __armv4_mmu_cache_flush
674
675                 .word   0x6901b110              @ sa1110
676                 .word   0xfffffff0
677                 W(b)    __armv4_mmu_cache_on
678                 W(b)    __armv4_mmu_cache_off
679                 W(b)    __armv4_mmu_cache_flush
680
681                 .word   0x56056930
682                 .word   0xff0ffff0              @ PXA935
683                 W(b)    __armv4_mmu_cache_on
684                 W(b)    __armv4_mmu_cache_off
685                 W(b)    __armv4_mmu_cache_flush
686
687                 .word   0x56158000              @ PXA168
688                 .word   0xfffff000
689                 W(b)    __armv4_mmu_cache_on
690                 W(b)    __armv4_mmu_cache_off
691                 W(b)    __armv5tej_mmu_cache_flush
692
693                 .word   0x56056930
694                 .word   0xff0ffff0              @ PXA935
695                 W(b)    __armv4_mmu_cache_on
696                 W(b)    __armv4_mmu_cache_off
697                 W(b)    __armv4_mmu_cache_flush
698
699                 .word   0x56050000              @ Feroceon
700                 .word   0xff0f0000
701                 W(b)    __armv4_mmu_cache_on
702                 W(b)    __armv4_mmu_cache_off
703                 W(b)    __armv5tej_mmu_cache_flush
704
705 #ifdef CONFIG_CPU_FEROCEON_OLD_ID
706                 /* this conflicts with the standard ARMv5TE entry */
707                 .long   0x41009260              @ Old Feroceon
708                 .long   0xff00fff0
709                 b       __armv4_mmu_cache_on
710                 b       __armv4_mmu_cache_off
711                 b       __armv5tej_mmu_cache_flush
712 #endif
713
714                 .word   0x66015261              @ FA526
715                 .word   0xff01fff1
716                 W(b)    __fa526_cache_on
717                 W(b)    __armv4_mmu_cache_off
718                 W(b)    __fa526_cache_flush
719
720                 @ These match on the architecture ID
721
722                 .word   0x00020000              @ ARMv4T
723                 .word   0x000f0000
724                 W(b)    __armv4_mmu_cache_on
725                 W(b)    __armv4_mmu_cache_off
726                 W(b)    __armv4_mmu_cache_flush
727
728                 .word   0x00050000              @ ARMv5TE
729                 .word   0x000f0000
730                 W(b)    __armv4_mmu_cache_on
731                 W(b)    __armv4_mmu_cache_off
732                 W(b)    __armv4_mmu_cache_flush
733
734                 .word   0x00060000              @ ARMv5TEJ
735                 .word   0x000f0000
736                 W(b)    __armv4_mmu_cache_on
737                 W(b)    __armv4_mmu_cache_off
738                 W(b)    __armv4_mmu_cache_flush
739
740                 .word   0x0007b000              @ ARMv6
741                 .word   0x000ff000
742                 W(b)    __armv4_mmu_cache_on
743                 W(b)    __armv4_mmu_cache_off
744                 W(b)    __armv6_mmu_cache_flush
745
746                 .word   0x560f5810              @ Marvell PJ4 ARMv6
747                 .word   0xff0ffff0
748                 W(b)    __armv4_mmu_cache_on
749                 W(b)    __armv4_mmu_cache_off
750                 W(b)    __armv6_mmu_cache_flush
751
752                 .word   0x000f0000              @ new CPU Id
753                 .word   0x000f0000
754                 W(b)    __armv7_mmu_cache_on
755                 W(b)    __armv7_mmu_cache_off
756                 W(b)    __armv7_mmu_cache_flush
757
758                 .word   0                       @ unrecognised type
759                 .word   0
760                 mov     pc, lr
761  THUMB(         nop                             )
762                 mov     pc, lr
763  THUMB(         nop                             )
764                 mov     pc, lr
765  THUMB(         nop                             )
766
767                 .size   proc_types, . - proc_types
768
769 /*
770  * Turn off the Cache and MMU.  ARMv3 does not support
771  * reading the control register, but ARMv4 does.
772  *
773  * On entry,  r6 = processor ID
774  * On exit,   r0, r1, r2, r3, r12 corrupted
775  * This routine must preserve: r4, r6, r7
776  */
777                 .align  5
778 cache_off:      mov     r3, #12                 @ cache_off function
779                 b       call_cache_fn
780
781 __armv4_mpu_cache_off:
782                 mrc     p15, 0, r0, c1, c0
783                 bic     r0, r0, #0x000d
784                 mcr     p15, 0, r0, c1, c0      @ turn MPU and cache off
785                 mov     r0, #0
786                 mcr     p15, 0, r0, c7, c10, 4  @ drain write buffer
787                 mcr     p15, 0, r0, c7, c6, 0   @ flush D-Cache
788                 mcr     p15, 0, r0, c7, c5, 0   @ flush I-Cache
789                 mov     pc, lr
790
791 __armv3_mpu_cache_off:
792                 mrc     p15, 0, r0, c1, c0
793                 bic     r0, r0, #0x000d
794                 mcr     p15, 0, r0, c1, c0, 0   @ turn MPU and cache off
795                 mov     r0, #0
796                 mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
797                 mov     pc, lr
798
799 __armv4_mmu_cache_off:
800 #ifdef CONFIG_MMU
801                 mrc     p15, 0, r0, c1, c0
802                 bic     r0, r0, #0x000d
803                 mcr     p15, 0, r0, c1, c0      @ turn MMU and cache off
804                 mov     r0, #0
805                 mcr     p15, 0, r0, c7, c7      @ invalidate whole cache v4
806                 mcr     p15, 0, r0, c8, c7      @ invalidate whole TLB v4
807 #endif
808                 mov     pc, lr
809
810 __armv7_mmu_cache_off:
811                 mrc     p15, 0, r0, c1, c0
812 #ifdef CONFIG_MMU
813                 bic     r0, r0, #0x000d
814 #else
815                 bic     r0, r0, #0x000c
816 #endif
817                 mcr     p15, 0, r0, c1, c0      @ turn MMU and cache off
818                 mov     r12, lr
819                 bl      __armv7_mmu_cache_flush
820                 mov     r0, #0
821 #ifdef CONFIG_MMU
822                 mcr     p15, 0, r0, c8, c7, 0   @ invalidate whole TLB
823 #endif
824                 mcr     p15, 0, r0, c7, c5, 6   @ invalidate BTC
825                 mcr     p15, 0, r0, c7, c10, 4  @ DSB
826                 mcr     p15, 0, r0, c7, c5, 4   @ ISB
827                 mov     pc, r12
828
829 __arm6_mmu_cache_off:
830                 mov     r0, #0x00000030         @ ARM6 control reg.
831                 b       __armv3_mmu_cache_off
832
833 __arm7_mmu_cache_off:
834                 mov     r0, #0x00000070         @ ARM7 control reg.
835                 b       __armv3_mmu_cache_off
836
837 __armv3_mmu_cache_off:
838                 mcr     p15, 0, r0, c1, c0, 0   @ turn MMU and cache off
839                 mov     r0, #0
840                 mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
841                 mcr     p15, 0, r0, c5, c0, 0   @ invalidate whole TLB v3
842                 mov     pc, lr
843
844 /*
845  * Clean and flush the cache to maintain consistency.
846  *
847  * On entry,
848  *  r6 = processor ID
849  * On exit,
850  *  r1, r2, r3, r11, r12 corrupted
851  * This routine must preserve:
852  *  r0, r4, r5, r6, r7
853  */
854                 .align  5
855 cache_clean_flush:
856                 mov     r3, #16
857                 b       call_cache_fn
858
859 __armv4_mpu_cache_flush:
860                 mov     r2, #1
861                 mov     r3, #0
862                 mcr     p15, 0, ip, c7, c6, 0   @ invalidate D cache
863                 mov     r1, #7 << 5             @ 8 segments
864 1:              orr     r3, r1, #63 << 26       @ 64 entries
865 2:              mcr     p15, 0, r3, c7, c14, 2  @ clean & invalidate D index
866                 subs    r3, r3, #1 << 26
867                 bcs     2b                      @ entries 63 to 0
868                 subs    r1, r1, #1 << 5
869                 bcs     1b                      @ segments 7 to 0
870
871                 teq     r2, #0
872                 mcrne   p15, 0, ip, c7, c5, 0   @ invalidate I cache
873                 mcr     p15, 0, ip, c7, c10, 4  @ drain WB
874                 mov     pc, lr
875                 
876 __fa526_cache_flush:
877                 mov     r1, #0
878                 mcr     p15, 0, r1, c7, c14, 0  @ clean and invalidate D cache
879                 mcr     p15, 0, r1, c7, c5, 0   @ flush I cache
880                 mcr     p15, 0, r1, c7, c10, 4  @ drain WB
881                 mov     pc, lr
882
883 __armv6_mmu_cache_flush:
884                 mov     r1, #0
885                 mcr     p15, 0, r1, c7, c14, 0  @ clean+invalidate D
886                 mcr     p15, 0, r1, c7, c5, 0   @ invalidate I+BTB
887                 mcr     p15, 0, r1, c7, c15, 0  @ clean+invalidate unified
888                 mcr     p15, 0, r1, c7, c10, 4  @ drain WB
889                 mov     pc, lr
890
891 __armv7_mmu_cache_flush:
892                 mrc     p15, 0, r10, c0, c1, 5  @ read ID_MMFR1
893                 tst     r10, #0xf << 16         @ hierarchical cache (ARMv7)
894                 mov     r10, #0
895                 beq     hierarchical
896                 mcr     p15, 0, r10, c7, c14, 0 @ clean+invalidate D
897                 b       iflush
898 hierarchical:
899                 mcr     p15, 0, r10, c7, c10, 5 @ DMB
900                 stmfd   sp!, {r0-r7, r9-r11}
901                 mrc     p15, 1, r0, c0, c0, 1   @ read clidr
902                 ands    r3, r0, #0x7000000      @ extract loc from clidr
903                 mov     r3, r3, lsr #23         @ left align loc bit field
904                 beq     finished                @ if loc is 0, then no need to clean
905                 mov     r10, #0                 @ start clean at cache level 0
906 loop1:
907                 add     r2, r10, r10, lsr #1    @ work out 3x current cache level
908                 mov     r1, r0, lsr r2          @ extract cache type bits from clidr
909                 and     r1, r1, #7              @ mask of the bits for current cache only
910                 cmp     r1, #2                  @ see what cache we have at this level
911                 blt     skip                    @ skip if no cache, or just i-cache
912                 mcr     p15, 2, r10, c0, c0, 0  @ select current cache level in cssr
913                 mcr     p15, 0, r10, c7, c5, 4  @ isb to sych the new cssr&csidr
914                 mrc     p15, 1, r1, c0, c0, 0   @ read the new csidr
915                 and     r2, r1, #7              @ extract the length of the cache lines
916                 add     r2, r2, #4              @ add 4 (line length offset)
917                 ldr     r4, =0x3ff
918                 ands    r4, r4, r1, lsr #3      @ find maximum number on the way size
919                 clz     r5, r4                  @ find bit position of way size increment
920                 ldr     r7, =0x7fff
921                 ands    r7, r7, r1, lsr #13     @ extract max number of the index size
922 loop2:
923                 mov     r9, r4                  @ create working copy of max way size
924 loop3:
925  ARM(           orr     r11, r10, r9, lsl r5    ) @ factor way and cache number into r11
926  ARM(           orr     r11, r11, r7, lsl r2    ) @ factor index number into r11
927  THUMB(         lsl     r6, r9, r5              )
928  THUMB(         orr     r11, r10, r6            ) @ factor way and cache number into r11
929  THUMB(         lsl     r6, r7, r2              )
930  THUMB(         orr     r11, r11, r6            ) @ factor index number into r11
931                 mcr     p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
932                 subs    r9, r9, #1              @ decrement the way
933                 bge     loop3
934                 subs    r7, r7, #1              @ decrement the index
935                 bge     loop2
936 skip:
937                 add     r10, r10, #2            @ increment cache number
938                 cmp     r3, r10
939                 bgt     loop1
940 finished:
941                 ldmfd   sp!, {r0-r7, r9-r11}
942                 mov     r10, #0                 @ swith back to cache level 0
943                 mcr     p15, 2, r10, c0, c0, 0  @ select current cache level in cssr
944 iflush:
945                 mcr     p15, 0, r10, c7, c10, 4 @ DSB
946                 mcr     p15, 0, r10, c7, c5, 0  @ invalidate I+BTB
947                 mcr     p15, 0, r10, c7, c10, 4 @ DSB
948                 mcr     p15, 0, r10, c7, c5, 4  @ ISB
949                 mov     pc, lr
950
951 __armv5tej_mmu_cache_flush:
952 1:              mrc     p15, 0, r15, c7, c14, 3 @ test,clean,invalidate D cache
953                 bne     1b
954                 mcr     p15, 0, r0, c7, c5, 0   @ flush I cache
955                 mcr     p15, 0, r0, c7, c10, 4  @ drain WB
956                 mov     pc, lr
957
958 __armv4_mmu_cache_flush:
959                 mov     r2, #64*1024            @ default: 32K dcache size (*2)
960                 mov     r11, #32                @ default: 32 byte line size
961                 mrc     p15, 0, r3, c0, c0, 1   @ read cache type
962                 teq     r3, r6                  @ cache ID register present?
963                 beq     no_cache_id
964                 mov     r1, r3, lsr #18
965                 and     r1, r1, #7
966                 mov     r2, #1024
967                 mov     r2, r2, lsl r1          @ base dcache size *2
968                 tst     r3, #1 << 14            @ test M bit
969                 addne   r2, r2, r2, lsr #1      @ +1/2 size if M == 1
970                 mov     r3, r3, lsr #12
971                 and     r3, r3, #3
972                 mov     r11, #8
973                 mov     r11, r11, lsl r3        @ cache line size in bytes
974 no_cache_id:
975                 mov     r1, pc
976                 bic     r1, r1, #63             @ align to longest cache line
977                 add     r2, r1, r2
978 1:
979  ARM(           ldr     r3, [r1], r11           ) @ s/w flush D cache
980  THUMB(         ldr     r3, [r1]                ) @ s/w flush D cache
981  THUMB(         add     r1, r1, r11             )
982                 teq     r1, r2
983                 bne     1b
984
985                 mcr     p15, 0, r1, c7, c5, 0   @ flush I cache
986                 mcr     p15, 0, r1, c7, c6, 0   @ flush D cache
987                 mcr     p15, 0, r1, c7, c10, 4  @ drain WB
988                 mov     pc, lr
989
990 __armv3_mmu_cache_flush:
991 __armv3_mpu_cache_flush:
992                 mov     r1, #0
993                 mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
994                 mov     pc, lr
995
996 /*
997  * Various debugging routines for printing hex characters and
998  * memory, which again must be relocatable.
999  */
1000 #ifdef DEBUG
1001                 .align  2
1002                 .type   phexbuf,#object
1003 phexbuf:        .space  12
1004                 .size   phexbuf, . - phexbuf
1005
1006 phex:           adr     r3, phexbuf
1007                 mov     r2, #0
1008                 strb    r2, [r3, r1]
1009 1:              subs    r1, r1, #1
1010                 movmi   r0, r3
1011                 bmi     puts
1012                 and     r2, r0, #15
1013                 mov     r0, r0, lsr #4
1014                 cmp     r2, #10
1015                 addge   r2, r2, #7
1016                 add     r2, r2, #'0'
1017                 strb    r2, [r3, r1]
1018                 b       1b
1019
1020 puts:           loadsp  r3
1021 1:              ldrb    r2, [r0], #1
1022                 teq     r2, #0
1023                 moveq   pc, lr
1024 2:              writeb  r2, r3
1025                 mov     r1, #0x00020000
1026 3:              subs    r1, r1, #1
1027                 bne     3b
1028                 teq     r2, #'\n'
1029                 moveq   r2, #'\r'
1030                 beq     2b
1031                 teq     r0, #0
1032                 bne     1b
1033                 mov     pc, lr
1034 putc:
1035                 mov     r2, r0
1036                 mov     r0, #0
1037                 loadsp  r3
1038                 b       2b
1039
1040 memdump:        mov     r12, r0
1041                 mov     r10, lr
1042                 mov     r11, #0
1043 2:              mov     r0, r11, lsl #2
1044                 add     r0, r0, r12
1045                 mov     r1, #8
1046                 bl      phex
1047                 mov     r0, #':'
1048                 bl      putc
1049 1:              mov     r0, #' '
1050                 bl      putc
1051                 ldr     r0, [r12, r11, lsl #2]
1052                 mov     r1, #8
1053                 bl      phex
1054                 and     r0, r11, #7
1055                 teq     r0, #3
1056                 moveq   r0, #' '
1057                 bleq    putc
1058                 and     r0, r11, #7
1059                 add     r11, r11, #1
1060                 teq     r0, #7
1061                 bne     1b
1062                 mov     r0, #'\n'
1063                 bl      putc
1064                 cmp     r11, #64
1065                 blt     2b
1066                 mov     pc, r10
1067 #endif
1068
1069                 .ltorg
1070 reloc_end:
1071
1072                 .align
1073                 .section ".stack", "w"
1074 user_stack:     .space  4096