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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/arm/mm/proc-arm920.S: MMU functions for ARM920
3 *
4 * Copyright (C) 1999,2000 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 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 *
23 * These are the low level assembler for performing cache and TLB
24 * functions on the arm920.
25 *
26 * CONFIG_CPU_ARM920_CPU_IDLE -> nohlt
27 */
28#include <linux/linkage.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/init.h>
30#include <asm/assembler.h>
Russell Kingee90dab2006-11-09 14:20:47 +000031#include <asm/elf.h>
Russell King74945c82006-03-16 14:44:36 +000032#include <asm/pgtable-hwdef.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <asm/pgtable.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <asm/page.h>
35#include <asm/ptrace.h>
36#include "proc-macros.S"
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 8
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 65536
59
60
61 .text
62/*
63 * cpu_arm920_proc_init()
64 */
65ENTRY(cpu_arm920_proc_init)
66 mov pc, lr
67
68/*
69 * cpu_arm920_proc_fin()
70 */
71ENTRY(cpu_arm920_proc_fin)
72 stmfd sp!, {lr}
73 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
74 msr cpsr_c, ip
75#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
76 bl arm920_flush_kern_cache_all
77#else
78 bl v4wt_flush_kern_cache_all
79#endif
80 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
81 bic r0, r0, #0x1000 @ ...i............
82 bic r0, r0, #0x000e @ ............wca.
83 mcr p15, 0, r0, c1, c0, 0 @ disable caches
84 ldmfd sp!, {pc}
85
86/*
87 * cpu_arm920_reset(loc)
88 *
89 * Perform a soft reset of the system. Put the CPU into the
90 * same state as it would be if it had been reset, and branch
91 * to what would be the reset vector.
92 *
93 * loc: location to jump to for soft reset
94 */
95 .align 5
96ENTRY(cpu_arm920_reset)
97 mov ip, #0
98 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
99 mcr p15, 0, ip, c7, c10, 4 @ drain WB
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100100#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100102#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
104 bic ip, ip, #0x000f @ ............wcam
105 bic ip, ip, #0x1100 @ ...i...s........
106 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
107 mov pc, r0
108
109/*
110 * cpu_arm920_do_idle()
111 */
112 .align 5
113ENTRY(cpu_arm920_do_idle)
114 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
115 mov pc, lr
116
117
118#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
119
120/*
121 * flush_user_cache_all()
122 *
123 * Invalidate all cache entries in a particular address
124 * space.
125 */
126ENTRY(arm920_flush_user_cache_all)
127 /* FALLTHROUGH */
128
129/*
130 * flush_kern_cache_all()
131 *
132 * Clean and invalidate the entire cache.
133 */
134ENTRY(arm920_flush_kern_cache_all)
135 mov r2, #VM_EXEC
136 mov ip, #0
137__flush_whole_cache:
138 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
1391: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
1402: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
141 subs r3, r3, #1 << 26
142 bcs 2b @ entries 63 to 0
143 subs r1, r1, #1 << 5
144 bcs 1b @ segments 7 to 0
145 tst r2, #VM_EXEC
146 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
147 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
148 mov pc, lr
149
150/*
151 * flush_user_cache_range(start, end, flags)
152 *
153 * Invalidate a range of cache entries in the specified
154 * address space.
155 *
156 * - start - start address (inclusive)
157 * - end - end address (exclusive)
158 * - flags - vm_flags for address space
159 */
160ENTRY(arm920_flush_user_cache_range)
161 mov ip, #0
162 sub r3, r1, r0 @ calculate total size
163 cmp r3, #CACHE_DLIMIT
164 bhs __flush_whole_cache
165
1661: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
167 tst r2, #VM_EXEC
168 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
169 add r0, r0, #CACHE_DLINESIZE
170 cmp r0, r1
171 blo 1b
172 tst r2, #VM_EXEC
173 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
174 mov pc, lr
175
176/*
177 * coherent_kern_range(start, end)
178 *
179 * Ensure coherency between the Icache and the Dcache in the
180 * region described by start, end. If you have non-snooping
181 * Harvard caches, you need to implement this function.
182 *
183 * - start - virtual start address
184 * - end - virtual end address
185 */
186ENTRY(arm920_coherent_kern_range)
187 /* FALLTHROUGH */
188
189/*
190 * coherent_user_range(start, end)
191 *
192 * Ensure coherency between the Icache and the Dcache in the
193 * region described by start, end. If you have non-snooping
194 * Harvard caches, you need to implement this function.
195 *
196 * - start - virtual start address
197 * - end - virtual end address
198 */
199ENTRY(arm920_coherent_user_range)
200 bic r0, r0, #CACHE_DLINESIZE - 1
2011: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
202 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
203 add r0, r0, #CACHE_DLINESIZE
204 cmp r0, r1
205 blo 1b
206 mcr p15, 0, r0, c7, c10, 4 @ drain WB
207 mov pc, lr
208
209/*
210 * flush_kern_dcache_page(void *page)
211 *
212 * Ensure no D cache aliasing occurs, either with itself or
213 * the I cache
214 *
215 * - addr - page aligned address
216 */
217ENTRY(arm920_flush_kern_dcache_page)
218 add r1, r0, #PAGE_SZ
2191: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
220 add r0, r0, #CACHE_DLINESIZE
221 cmp r0, r1
222 blo 1b
223 mov r0, #0
224 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
225 mcr p15, 0, r0, c7, c10, 4 @ drain WB
226 mov pc, lr
227
228/*
229 * dma_inv_range(start, end)
230 *
231 * Invalidate (discard) the specified virtual address range.
232 * May not write back any entries. If 'start' or 'end'
233 * are not cache line aligned, those lines must be written
234 * back.
235 *
236 * - start - virtual start address
237 * - end - virtual end address
238 *
239 * (same as v4wb)
240 */
241ENTRY(arm920_dma_inv_range)
242 tst r0, #CACHE_DLINESIZE - 1
243 bic r0, r0, #CACHE_DLINESIZE - 1
244 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
245 tst r1, #CACHE_DLINESIZE - 1
246 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
2471: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
248 add r0, r0, #CACHE_DLINESIZE
249 cmp r0, r1
250 blo 1b
251 mcr p15, 0, r0, c7, c10, 4 @ drain WB
252 mov pc, lr
253
254/*
255 * dma_clean_range(start, end)
256 *
257 * Clean the specified virtual address range.
258 *
259 * - start - virtual start address
260 * - end - virtual end address
261 *
262 * (same as v4wb)
263 */
264ENTRY(arm920_dma_clean_range)
265 bic r0, r0, #CACHE_DLINESIZE - 1
2661: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
267 add r0, r0, #CACHE_DLINESIZE
268 cmp r0, r1
269 blo 1b
270 mcr p15, 0, r0, c7, c10, 4 @ drain WB
271 mov pc, lr
272
273/*
274 * dma_flush_range(start, end)
275 *
276 * Clean and invalidate the specified virtual address range.
277 *
278 * - start - virtual start address
279 * - end - virtual end address
280 */
281ENTRY(arm920_dma_flush_range)
282 bic r0, r0, #CACHE_DLINESIZE - 1
2831: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
284 add r0, r0, #CACHE_DLINESIZE
285 cmp r0, r1
286 blo 1b
287 mcr p15, 0, r0, c7, c10, 4 @ drain WB
288 mov pc, lr
289
290ENTRY(arm920_cache_fns)
291 .long arm920_flush_kern_cache_all
292 .long arm920_flush_user_cache_all
293 .long arm920_flush_user_cache_range
294 .long arm920_coherent_kern_range
295 .long arm920_coherent_user_range
296 .long arm920_flush_kern_dcache_page
297 .long arm920_dma_inv_range
298 .long arm920_dma_clean_range
299 .long arm920_dma_flush_range
300
301#endif
302
303
304ENTRY(cpu_arm920_dcache_clean_area)
3051: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
306 add r0, r0, #CACHE_DLINESIZE
307 subs r1, r1, #CACHE_DLINESIZE
308 bhi 1b
309 mov pc, lr
310
311/* =============================== PageTable ============================== */
312
313/*
314 * cpu_arm920_switch_mm(pgd)
315 *
316 * Set the translation base pointer to be as described by pgd.
317 *
318 * pgd: new page tables
319 */
320 .align 5
321ENTRY(cpu_arm920_switch_mm)
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100322#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 mov ip, #0
324#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
325 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
326#else
327@ && 'Clean & Invalidate whole DCache'
328@ && Re-written to use Index Ops.
329@ && Uses registers r1, r3 and ip
330
331 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
3321: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
3332: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
334 subs r3, r3, #1 << 26
335 bcs 2b @ entries 63 to 0
336 subs r1, r1, #1 << 5
337 bcs 1b @ segments 7 to 0
338#endif
339 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
340 mcr p15, 0, ip, c7, c10, 4 @ drain WB
341 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
342 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100343#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 mov pc, lr
345
346/*
Russell Kingad1ae2f2006-12-13 14:34:43 +0000347 * cpu_arm920_set_pte(ptep, pte, ext)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 *
349 * Set a PTE and flush it out
350 */
351 .align 5
Russell Kingad1ae2f2006-12-13 14:34:43 +0000352ENTRY(cpu_arm920_set_pte_ext)
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100353#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 str r1, [r0], #-2048 @ linux version
355
356 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
357
358 bic r2, r1, #PTE_SMALL_AP_MASK
359 bic r2, r2, #PTE_TYPE_MASK
360 orr r2, r2, #PTE_TYPE_SMALL
361
362 tst r1, #L_PTE_USER @ User?
363 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
364
365 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
366 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
367
368 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
369 movne r2, #0
370
371#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
372 eor r3, r2, #0x0a @ C & small page?
373 tst r3, #0x0b
374 biceq r2, r2, #4
375#endif
376 str r2, [r0] @ hardware version
377 mov r0, r0
378 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
379 mcr p15, 0, r0, c7, c10, 4 @ drain WB
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100380#endif /* CONFIG_MMU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 mov pc, lr
382
383 __INIT
384
385 .type __arm920_setup, #function
386__arm920_setup:
387 mov r0, #0
388 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
389 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100390#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100392#endif
Russell King22b190862006-06-29 15:09:57 +0100393 adr r5, arm920_crval
394 ldmia r5, {r5, r6}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 mrc p15, 0, r0, c1, c0 @ get control register v4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 bic r0, r0, r5
Russell King22b190862006-06-29 15:09:57 +0100397 orr r0, r0, r6
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 mov pc, lr
399 .size __arm920_setup, . - __arm920_setup
400
401 /*
402 * R
403 * .RVI ZFRS BLDP WCAM
404 * ..11 0001 ..11 0101
405 *
406 */
Russell King22b190862006-06-29 15:09:57 +0100407 .type arm920_crval, #object
408arm920_crval:
409 crval clear=0x00003f3f, mmuset=0x00003135, ucset=0x00001130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
411 __INITDATA
412
413/*
414 * Purpose : Function pointers used to access above functions - all calls
415 * come through these
416 */
417 .type arm920_processor_functions, #object
418arm920_processor_functions:
419 .word v4t_early_abort
420 .word cpu_arm920_proc_init
421 .word cpu_arm920_proc_fin
422 .word cpu_arm920_reset
423 .word cpu_arm920_do_idle
424 .word cpu_arm920_dcache_clean_area
425 .word cpu_arm920_switch_mm
Russell Kingad1ae2f2006-12-13 14:34:43 +0000426 .word cpu_arm920_set_pte_ext
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 .size arm920_processor_functions, . - arm920_processor_functions
428
429 .section ".rodata"
430
431 .type cpu_arch_name, #object
432cpu_arch_name:
433 .asciz "armv4t"
434 .size cpu_arch_name, . - cpu_arch_name
435
436 .type cpu_elf_name, #object
437cpu_elf_name:
438 .asciz "v4"
439 .size cpu_elf_name, . - cpu_elf_name
440
441 .type cpu_arm920_name, #object
442cpu_arm920_name:
Russell King264edb32006-06-29 15:03:09 +0100443 .asciz "ARM920T"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 .size cpu_arm920_name, . - cpu_arm920_name
445
446 .align
447
Ben Dooks02b7dd12005-09-20 16:35:03 +0100448 .section ".proc.info.init", #alloc, #execinstr
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450 .type __arm920_proc_info,#object
451__arm920_proc_info:
452 .long 0x41009200
453 .long 0xff00fff0
454 .long PMD_TYPE_SECT | \
455 PMD_SECT_BUFFERABLE | \
456 PMD_SECT_CACHEABLE | \
457 PMD_BIT4 | \
458 PMD_SECT_AP_WRITE | \
459 PMD_SECT_AP_READ
Russell King8799ee92006-06-29 18:24:21 +0100460 .long PMD_TYPE_SECT | \
461 PMD_BIT4 | \
462 PMD_SECT_AP_WRITE | \
463 PMD_SECT_AP_READ
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 b __arm920_setup
465 .long cpu_arch_name
466 .long cpu_elf_name
467 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
468 .long cpu_arm920_name
469 .long arm920_processor_functions
470 .long v4wbi_tlb_fns
471 .long v4wb_user_fns
472#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
473 .long arm920_cache_fns
474#else
475 .long v4wt_cache_fns
476#endif
477 .size __arm920_proc_info, . - __arm920_proc_info