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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/arm/mm/proc-arm1026.S: MMU functions for ARM1026EJ-S
3 *
4 * Copyright (C) 2000 ARM Limited
5 * Copyright (C) 2000 Deep Blue Solutions Ltd.
Hyok S. Choid090ddd2006-06-28 14:10:01 +01006 * hacked for non-paged-MM by Hyok S. Choi, 2003.
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 *
14 * These are the low level assembler for performing cache and TLB
15 * functions on the ARM1026EJ-S.
16 */
17#include <linux/linkage.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/init.h>
19#include <asm/assembler.h>
Sam Ravnborge6ae7442005-09-09 21:08:59 +020020#include <asm/asm-offsets.h>
Russell Kingee90dab2006-11-09 14:20:47 +000021#include <asm/elf.h>
Russell King74945c82006-03-16 14:44:36 +000022#include <asm/pgtable-hwdef.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <asm/pgtable.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <asm/ptrace.h>
25
Russell King00eb0f62006-07-03 12:36:07 +010026#include "proc-macros.S"
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028/*
29 * This is the maximum size of an area which will be invalidated
30 * using the single invalidate entry instructions. Anything larger
31 * than this, and we go for the whole cache.
32 *
33 * This value should be chosen such that we choose the cheapest
34 * alternative.
35 */
36#define MAX_AREA_SIZE 32768
37
38/*
39 * The size of one data cache line.
40 */
41#define CACHE_DLINESIZE 32
42
43/*
44 * The number of data cache segments.
45 */
46#define CACHE_DSEGMENTS 16
47
48/*
49 * The number of lines in a cache segment.
50 */
51#define CACHE_DENTRIES 64
52
53/*
54 * This is the size at which it becomes more efficient to
55 * clean the whole cache, rather than using the individual
56 * cache line maintainence instructions.
57 */
58#define CACHE_DLIMIT 32768
59
60 .text
61/*
62 * cpu_arm1026_proc_init()
63 */
64ENTRY(cpu_arm1026_proc_init)
65 mov pc, lr
66
67/*
68 * cpu_arm1026_proc_fin()
69 */
70ENTRY(cpu_arm1026_proc_fin)
71 stmfd sp!, {lr}
72 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
73 msr cpsr_c, ip
74 bl arm1026_flush_kern_cache_all
75 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
76 bic r0, r0, #0x1000 @ ...i............
77 bic r0, r0, #0x000e @ ............wca.
78 mcr p15, 0, r0, c1, c0, 0 @ disable caches
79 ldmfd sp!, {pc}
80
81/*
82 * cpu_arm1026_reset(loc)
83 *
84 * Perform a soft reset of the system. Put the CPU into the
85 * same state as it would be if it had been reset, and branch
86 * to what would be the reset vector.
87 *
88 * loc: location to jump to for soft reset
89 */
90 .align 5
91ENTRY(cpu_arm1026_reset)
92 mov ip, #0
93 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
94 mcr p15, 0, ip, c7, c10, 4 @ drain WB
Hyok S. Choid090ddd2006-06-28 14:10:01 +010095#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
Hyok S. Choid090ddd2006-06-28 14:10:01 +010097#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
99 bic ip, ip, #0x000f @ ............wcam
100 bic ip, ip, #0x1100 @ ...i...s........
101 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
102 mov pc, r0
103
104/*
105 * cpu_arm1026_do_idle()
106 */
107 .align 5
108ENTRY(cpu_arm1026_do_idle)
109 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
110 mov pc, lr
111
112/* ================================= CACHE ================================ */
113
114 .align 5
115/*
116 * flush_user_cache_all()
117 *
118 * Invalidate all cache entries in a particular address
119 * space.
120 */
121ENTRY(arm1026_flush_user_cache_all)
122 /* FALLTHROUGH */
123/*
124 * flush_kern_cache_all()
125 *
126 * Clean and invalidate the entire cache.
127 */
128ENTRY(arm1026_flush_kern_cache_all)
129 mov r2, #VM_EXEC
130 mov ip, #0
131__flush_whole_cache:
132#ifndef CONFIG_CPU_DCACHE_DISABLE
1331: mrc p15, 0, r15, c7, c14, 3 @ test, clean, invalidate
134 bne 1b
135#endif
136 tst r2, #VM_EXEC
137#ifndef CONFIG_CPU_ICACHE_DISABLE
138 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
139#endif
140 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
141 mov pc, lr
142
143/*
144 * flush_user_cache_range(start, end, flags)
145 *
146 * Invalidate a range of cache entries in the specified
147 * address space.
148 *
149 * - start - start address (inclusive)
150 * - end - end address (exclusive)
151 * - flags - vm_flags for this space
152 */
153ENTRY(arm1026_flush_user_cache_range)
154 mov ip, #0
155 sub r3, r1, r0 @ calculate total size
156 cmp r3, #CACHE_DLIMIT
157 bhs __flush_whole_cache
158
159#ifndef CONFIG_CPU_DCACHE_DISABLE
1601: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
161 add r0, r0, #CACHE_DLINESIZE
162 cmp r0, r1
163 blo 1b
164#endif
165 tst r2, #VM_EXEC
166#ifndef CONFIG_CPU_ICACHE_DISABLE
167 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
168#endif
169 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
170 mov pc, lr
171
172/*
173 * coherent_kern_range(start, end)
174 *
175 * Ensure coherency between the Icache and the Dcache in the
176 * region described by start. If you have non-snooping
177 * Harvard caches, you need to implement this function.
178 *
179 * - start - virtual start address
180 * - end - virtual end address
181 */
182ENTRY(arm1026_coherent_kern_range)
183 /* FALLTHROUGH */
184/*
185 * coherent_user_range(start, end)
186 *
187 * Ensure coherency between the Icache and the Dcache in the
188 * region described by start. If you have non-snooping
189 * Harvard caches, you need to implement this function.
190 *
191 * - start - virtual start address
192 * - end - virtual end address
193 */
194ENTRY(arm1026_coherent_user_range)
195 mov ip, #0
196 bic r0, r0, #CACHE_DLINESIZE - 1
1971:
198#ifndef CONFIG_CPU_DCACHE_DISABLE
199 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
200#endif
201#ifndef CONFIG_CPU_ICACHE_DISABLE
202 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
203#endif
204 add r0, r0, #CACHE_DLINESIZE
205 cmp r0, r1
206 blo 1b
207 mcr p15, 0, ip, c7, c10, 4 @ drain WB
208 mov pc, lr
209
210/*
211 * flush_kern_dcache_page(void *page)
212 *
213 * Ensure no D cache aliasing occurs, either with itself or
214 * the I cache
215 *
216 * - page - page aligned address
217 */
218ENTRY(arm1026_flush_kern_dcache_page)
219 mov ip, #0
220#ifndef CONFIG_CPU_DCACHE_DISABLE
221 add r1, r0, #PAGE_SZ
2221: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
223 add r0, r0, #CACHE_DLINESIZE
224 cmp r0, r1
225 blo 1b
226#endif
227 mcr p15, 0, ip, c7, c10, 4 @ drain WB
228 mov pc, lr
229
230/*
231 * dma_inv_range(start, end)
232 *
233 * Invalidate (discard) the specified virtual address range.
234 * May not write back any entries. If 'start' or 'end'
235 * are not cache line aligned, those lines must be written
236 * back.
237 *
238 * - start - virtual start address
239 * - end - virtual end address
240 *
241 * (same as v4wb)
242 */
243ENTRY(arm1026_dma_inv_range)
244 mov ip, #0
245#ifndef CONFIG_CPU_DCACHE_DISABLE
246 tst r0, #CACHE_DLINESIZE - 1
247 bic r0, r0, #CACHE_DLINESIZE - 1
248 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
249 tst r1, #CACHE_DLINESIZE - 1
250 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
2511: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
252 add r0, r0, #CACHE_DLINESIZE
253 cmp r0, r1
254 blo 1b
255#endif
256 mcr p15, 0, ip, c7, c10, 4 @ drain WB
257 mov pc, lr
258
259/*
260 * dma_clean_range(start, end)
261 *
262 * Clean the specified virtual address range.
263 *
264 * - start - virtual start address
265 * - end - virtual end address
266 *
267 * (same as v4wb)
268 */
269ENTRY(arm1026_dma_clean_range)
270 mov ip, #0
271#ifndef CONFIG_CPU_DCACHE_DISABLE
272 bic r0, r0, #CACHE_DLINESIZE - 1
2731: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
274 add r0, r0, #CACHE_DLINESIZE
275 cmp r0, r1
276 blo 1b
277#endif
278 mcr p15, 0, ip, c7, c10, 4 @ drain WB
279 mov pc, lr
280
281/*
282 * dma_flush_range(start, end)
283 *
284 * Clean and invalidate the specified virtual address range.
285 *
286 * - start - virtual start address
287 * - end - virtual end address
288 */
289ENTRY(arm1026_dma_flush_range)
290 mov ip, #0
291#ifndef CONFIG_CPU_DCACHE_DISABLE
292 bic r0, r0, #CACHE_DLINESIZE - 1
2931: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
294 add r0, r0, #CACHE_DLINESIZE
295 cmp r0, r1
296 blo 1b
297#endif
298 mcr p15, 0, ip, c7, c10, 4 @ drain WB
299 mov pc, lr
300
301ENTRY(arm1026_cache_fns)
302 .long arm1026_flush_kern_cache_all
303 .long arm1026_flush_user_cache_all
304 .long arm1026_flush_user_cache_range
305 .long arm1026_coherent_kern_range
306 .long arm1026_coherent_user_range
307 .long arm1026_flush_kern_dcache_page
308 .long arm1026_dma_inv_range
309 .long arm1026_dma_clean_range
310 .long arm1026_dma_flush_range
311
312 .align 5
313ENTRY(cpu_arm1026_dcache_clean_area)
314#ifndef CONFIG_CPU_DCACHE_DISABLE
315 mov ip, #0
3161: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
317 add r0, r0, #CACHE_DLINESIZE
318 subs r1, r1, #CACHE_DLINESIZE
319 bhi 1b
320#endif
321 mov pc, lr
322
323/* =============================== PageTable ============================== */
324
325/*
326 * cpu_arm1026_switch_mm(pgd)
327 *
328 * Set the translation base pointer to be as described by pgd.
329 *
330 * pgd: new page tables
331 */
332 .align 5
333ENTRY(cpu_arm1026_switch_mm)
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100334#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 mov r1, #0
336#ifndef CONFIG_CPU_DCACHE_DISABLE
3371: mrc p15, 0, r15, c7, c14, 3 @ test, clean, invalidate
338 bne 1b
339#endif
340#ifndef CONFIG_CPU_ICACHE_DISABLE
341 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
342#endif
343 mcr p15, 0, r1, c7, c10, 4 @ drain WB
344 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
345 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100346#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 mov pc, lr
348
349/*
Russell Kingad1ae2f2006-12-13 14:34:43 +0000350 * cpu_arm1026_set_pte_ext(ptep, pte, ext)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 *
352 * Set a PTE and flush it out
353 */
354 .align 5
Russell Kingad1ae2f2006-12-13 14:34:43 +0000355ENTRY(cpu_arm1026_set_pte_ext)
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100356#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 str r1, [r0], #-2048 @ linux version
358
359 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
360
361 bic r2, r1, #PTE_SMALL_AP_MASK
362 bic r2, r2, #PTE_TYPE_MASK
363 orr r2, r2, #PTE_TYPE_SMALL
364
365 tst r1, #L_PTE_USER @ User?
366 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
367
368 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
369 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
370
371 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
372 movne r2, #0
373
374#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
375 eor r3, r1, #0x0a @ C & small page?
376 tst r3, #0x0b
377 biceq r2, r2, #4
378#endif
379 str r2, [r0] @ hardware version
380 mov r0, r0
381#ifndef CONFIG_CPU_DCACHE_DISABLE
382 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
383#endif
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100384#endif /* CONFIG_MMU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 mov pc, lr
386
387
388 __INIT
389
390 .type __arm1026_setup, #function
391__arm1026_setup:
392 mov r0, #0
393 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
394 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100395#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
397 mcr p15, 0, r4, c2, c0 @ load page table pointer
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100398#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
400 mov r0, #4 @ explicitly disable writeback
401 mcr p15, 7, r0, c15, c0, 0
402#endif
Russell King22b19082006-06-29 15:09:57 +0100403 adr r5, arm1026_crval
404 ldmia r5, {r5, r6}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 mrc p15, 0, r0, c1, c0 @ get control register v4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 bic r0, r0, r5
Russell King22b19082006-06-29 15:09:57 +0100407 orr r0, r0, r6
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
409 orr r0, r0, #0x4000 @ .R.. .... .... ....
410#endif
411 mov pc, lr
412 .size __arm1026_setup, . - __arm1026_setup
413
414 /*
415 * R
416 * .RVI ZFRS BLDP WCAM
417 * .011 1001 ..11 0101
418 *
419 */
Russell King22b19082006-06-29 15:09:57 +0100420 .type arm1026_crval, #object
421arm1026_crval:
422 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001934
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
424 __INITDATA
425
426/*
427 * Purpose : Function pointers used to access above functions - all calls
428 * come through these
429 */
430 .type arm1026_processor_functions, #object
431arm1026_processor_functions:
432 .word v5t_early_abort
433 .word cpu_arm1026_proc_init
434 .word cpu_arm1026_proc_fin
435 .word cpu_arm1026_reset
436 .word cpu_arm1026_do_idle
437 .word cpu_arm1026_dcache_clean_area
438 .word cpu_arm1026_switch_mm
Russell Kingad1ae2f2006-12-13 14:34:43 +0000439 .word cpu_arm1026_set_pte_ext
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 .size arm1026_processor_functions, . - arm1026_processor_functions
441
442 .section .rodata
443
444 .type cpu_arch_name, #object
445cpu_arch_name:
446 .asciz "armv5tej"
447 .size cpu_arch_name, . - cpu_arch_name
448
449 .type cpu_elf_name, #object
450cpu_elf_name:
451 .asciz "v5"
452 .size cpu_elf_name, . - cpu_elf_name
453 .align
454
455 .type cpu_arm1026_name, #object
456cpu_arm1026_name:
Russell King264edb32006-06-29 15:03:09 +0100457 .asciz "ARM1026EJ-S"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 .size cpu_arm1026_name, . - cpu_arm1026_name
459
460 .align
461
Ben Dooks02b7dd12005-09-20 16:35:03 +0100462 .section ".proc.info.init", #alloc, #execinstr
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463
464 .type __arm1026_proc_info,#object
465__arm1026_proc_info:
466 .long 0x4106a260 @ ARM 1026EJ-S (v5TEJ)
467 .long 0xff0ffff0
468 .long PMD_TYPE_SECT | \
469 PMD_BIT4 | \
470 PMD_SECT_AP_WRITE | \
471 PMD_SECT_AP_READ
Russell King8799ee92006-06-29 18:24:21 +0100472 .long PMD_TYPE_SECT | \
473 PMD_BIT4 | \
474 PMD_SECT_AP_WRITE | \
475 PMD_SECT_AP_READ
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 b __arm1026_setup
477 .long cpu_arch_name
478 .long cpu_elf_name
479 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA
480 .long cpu_arm1026_name
481 .long arm1026_processor_functions
482 .long v4wbi_tlb_fns
483 .long v4wb_user_fns
484 .long arm1026_cache_fns
485 .size __arm1026_proc_info, . - __arm1026_proc_info