| blob | d9fb4b98c49ff8866a1d36288d431ce364ad1180 |
1 /*
2 * linux/arch/arm/mm/proc-arm1020.S: MMU functions for ARM1020
3 *
4 * Copyright (C) 2000 ARM Limited
5 * Copyright (C) 2000 Deep Blue Solutions Ltd.
6 * hacked for non-paged-MM by Hyok S. Choi, 2003.
7 *
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 arm1020.
25 *
26 * CONFIG_CPU_ARM1020_CPU_IDLE -> nohlt
27 */
28 #include <linux/linkage.h>
29 #include <linux/init.h>
30 #include <asm/assembler.h>
31 #include <asm/asm-offsets.h>
32 #include <asm/hwcap.h>
33 #include <asm/pgtable-hwdef.h>
34 #include <asm/pgtable.h>
35 #include <asm/ptrace.h>
37 #include "proc-macros.S"
39 /*
40 * This is the maximum size of an area which will be invalidated
41 * using the single invalidate entry instructions. Anything larger
42 * than this, and we go for the whole cache.
43 *
44 * This value should be chosen such that we choose the cheapest
45 * alternative.
46 */
47 #define MAX_AREA_SIZE 32768
49 /*
50 * The size of one data cache line.
51 */
52 #define CACHE_DLINESIZE 32
54 /*
55 * The number of data cache segments.
56 */
57 #define CACHE_DSEGMENTS 16
59 /*
60 * The number of lines in a cache segment.
61 */
62 #define CACHE_DENTRIES 64
64 /*
65 * This is the size at which it becomes more efficient to
66 * clean the whole cache, rather than using the individual
67 * cache line maintainence instructions.
68 */
69 #define CACHE_DLIMIT 32768
71 .text
72 /*
73 * cpu_arm1020_proc_init()
74 */
75 ENTRY(cpu_arm1020_proc_init)
76 mov pc, lr
78 /*
79 * cpu_arm1020_proc_fin()
80 */
81 ENTRY(cpu_arm1020_proc_fin)
82 stmfd sp!, {lr}
83 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
84 msr cpsr_c, ip
85 bl arm1020_flush_kern_cache_all
86 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
87 bic r0, r0, #0x1000 @ ...i............
88 bic r0, r0, #0x000e @ ............wca.
89 mcr p15, 0, r0, c1, c0, 0 @ disable caches
90 ldmfd sp!, {pc}
92 /*
93 * cpu_arm1020_reset(loc)
94 *
95 * Perform a soft reset of the system. Put the CPU into the
96 * same state as it would be if it had been reset, and branch
97 * to what would be the reset vector.
98 *
99 * loc: location to jump to for soft reset
100 */
101 .align 5
102 ENTRY(cpu_arm1020_reset)
103 mov ip, #0
104 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
105 mcr p15, 0, ip, c7, c10, 4 @ drain WB
106 #ifdef CONFIG_MMU
107 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
108 #endif
109 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
110 bic ip, ip, #0x000f @ ............wcam
111 bic ip, ip, #0x1100 @ ...i...s........
112 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
113 mov pc, r0
115 /*
116 * cpu_arm1020_do_idle()
117 */
118 .align 5
119 ENTRY(cpu_arm1020_do_idle)
120 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
121 mov pc, lr
123 /* ================================= CACHE ================================ */
125 .align 5
126 /*
127 * flush_user_cache_all()
128 *
129 * Invalidate all cache entries in a particular address
130 * space.
131 */
132 ENTRY(arm1020_flush_user_cache_all)
133 /* FALLTHROUGH */
134 /*
135 * flush_kern_cache_all()
136 *
137 * Clean and invalidate the entire cache.
138 */
139 ENTRY(arm1020_flush_kern_cache_all)
140 mov r2, #VM_EXEC
141 mov ip, #0
142 __flush_whole_cache:
143 #ifndef CONFIG_CPU_DCACHE_DISABLE
144 mcr p15, 0, ip, c7, c10, 4 @ drain WB
145 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
146 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
147 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
148 mcr p15, 0, ip, c7, c10, 4 @ drain WB
149 subs r3, r3, #1 << 26
150 bcs 2b @ entries 63 to 0
151 subs r1, r1, #1 << 5
152 bcs 1b @ segments 15 to 0
153 #endif
154 tst r2, #VM_EXEC
155 #ifndef CONFIG_CPU_ICACHE_DISABLE
156 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
157 #endif
158 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
159 mov pc, lr
161 /*
162 * flush_user_cache_range(start, end, flags)
163 *
164 * Invalidate a range of cache entries in the specified
165 * address space.
166 *
167 * - start - start address (inclusive)
168 * - end - end address (exclusive)
169 * - flags - vm_flags for this space
170 */
171 ENTRY(arm1020_flush_user_cache_range)
172 mov ip, #0
173 sub r3, r1, r0 @ calculate total size
174 cmp r3, #CACHE_DLIMIT
175 bhs __flush_whole_cache
177 #ifndef CONFIG_CPU_DCACHE_DISABLE
178 mcr p15, 0, ip, c7, c10, 4
179 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
180 mcr p15, 0, ip, c7, c10, 4 @ drain WB
181 add r0, r0, #CACHE_DLINESIZE
182 cmp r0, r1
183 blo 1b
184 #endif
185 tst r2, #VM_EXEC
186 #ifndef CONFIG_CPU_ICACHE_DISABLE
187 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
188 #endif
189 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
190 mov pc, lr
192 /*
193 * coherent_kern_range(start, end)
194 *
195 * Ensure coherency between the Icache and the Dcache in the
196 * region described by start. If you have non-snooping
197 * Harvard caches, you need to implement this function.
198 *
199 * - start - virtual start address
200 * - end - virtual end address
201 */
202 ENTRY(arm1020_coherent_kern_range)
203 /* FALLTRHOUGH */
205 /*
206 * coherent_user_range(start, end)
207 *
208 * Ensure coherency between the Icache and the Dcache in the
209 * region described by start. If you have non-snooping
210 * Harvard caches, you need to implement this function.
211 *
212 * - start - virtual start address
213 * - end - virtual end address
214 */
215 ENTRY(arm1020_coherent_user_range)
216 mov ip, #0
217 bic r0, r0, #CACHE_DLINESIZE - 1
218 mcr p15, 0, ip, c7, c10, 4
219 1:
220 #ifndef CONFIG_CPU_DCACHE_DISABLE
221 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
222 mcr p15, 0, ip, c7, c10, 4 @ drain WB
223 #endif
224 #ifndef CONFIG_CPU_ICACHE_DISABLE
225 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
226 #endif
227 add r0, r0, #CACHE_DLINESIZE
228 cmp r0, r1
229 blo 1b
230 mcr p15, 0, ip, c7, c10, 4 @ drain WB
231 mov pc, lr
233 /*
234 * flush_kern_dcache_page(void *page)
235 *
236 * Ensure no D cache aliasing occurs, either with itself or
237 * the I cache
238 *
239 * - page - page aligned address
240 */
241 ENTRY(arm1020_flush_kern_dcache_page)
242 mov ip, #0
243 #ifndef CONFIG_CPU_DCACHE_DISABLE
244 add r1, r0, #PAGE_SZ
245 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
246 mcr p15, 0, ip, c7, c10, 4 @ drain WB
247 add r0, r0, #CACHE_DLINESIZE
248 cmp r0, r1
249 blo 1b
250 #endif
251 mcr p15, 0, ip, c7, c10, 4 @ drain WB
252 mov pc, lr
254 /*
255 * dma_inv_range(start, end)
256 *
257 * Invalidate (discard) the specified virtual address range.
258 * May not write back any entries. If 'start' or 'end'
259 * are not cache line aligned, those lines must be written
260 * back.
261 *
262 * - start - virtual start address
263 * - end - virtual end address
264 *
265 * (same as v4wb)
266 */
267 ENTRY(arm1020_dma_inv_range)
268 mov ip, #0
269 #ifndef CONFIG_CPU_DCACHE_DISABLE
270 tst r0, #CACHE_DLINESIZE - 1
271 bic r0, r0, #CACHE_DLINESIZE - 1
272 mcrne p15, 0, ip, c7, c10, 4
273 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
274 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
275 tst r1, #CACHE_DLINESIZE - 1
276 mcrne p15, 0, ip, c7, c10, 4
277 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
278 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
279 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
280 add r0, r0, #CACHE_DLINESIZE
281 cmp r0, r1
282 blo 1b
283 #endif
284 mcr p15, 0, ip, c7, c10, 4 @ drain WB
285 mov pc, lr
287 /*
288 * dma_clean_range(start, end)
289 *
290 * Clean the specified virtual address range.
291 *
292 * - start - virtual start address
293 * - end - virtual end address
294 *
295 * (same as v4wb)
296 */
297 ENTRY(arm1020_dma_clean_range)
298 mov ip, #0
299 #ifndef CONFIG_CPU_DCACHE_DISABLE
300 bic r0, r0, #CACHE_DLINESIZE - 1
301 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
302 mcr p15, 0, ip, c7, c10, 4 @ drain WB
303 add r0, r0, #CACHE_DLINESIZE
304 cmp r0, r1
305 blo 1b
306 #endif
307 mcr p15, 0, ip, c7, c10, 4 @ drain WB
308 mov pc, lr
310 /*
311 * dma_flush_range(start, end)
312 *
313 * Clean and invalidate the specified virtual address range.
314 *
315 * - start - virtual start address
316 * - end - virtual end address
317 */
318 ENTRY(arm1020_dma_flush_range)
319 mov ip, #0
320 #ifndef CONFIG_CPU_DCACHE_DISABLE
321 bic r0, r0, #CACHE_DLINESIZE - 1
322 mcr p15, 0, ip, c7, c10, 4
323 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
324 mcr p15, 0, ip, c7, c10, 4 @ drain WB
325 add r0, r0, #CACHE_DLINESIZE
326 cmp r0, r1
327 blo 1b
328 #endif
329 mcr p15, 0, ip, c7, c10, 4 @ drain WB
330 mov pc, lr
332 ENTRY(arm1020_cache_fns)
333 .long arm1020_flush_kern_cache_all
334 .long arm1020_flush_user_cache_all
335 .long arm1020_flush_user_cache_range
336 .long arm1020_coherent_kern_range
337 .long arm1020_coherent_user_range
338 .long arm1020_flush_kern_dcache_page
339 .long arm1020_dma_inv_range
340 .long arm1020_dma_clean_range
341 .long arm1020_dma_flush_range
343 .align 5
344 ENTRY(cpu_arm1020_dcache_clean_area)
345 #ifndef CONFIG_CPU_DCACHE_DISABLE
346 mov ip, #0
347 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
348 mcr p15, 0, ip, c7, c10, 4 @ drain WB
349 add r0, r0, #CACHE_DLINESIZE
350 subs r1, r1, #CACHE_DLINESIZE
351 bhi 1b
352 #endif
353 mov pc, lr
355 /* =============================== PageTable ============================== */
357 /*
358 * cpu_arm1020_switch_mm(pgd)
359 *
360 * Set the translation base pointer to be as described by pgd.
361 *
362 * pgd: new page tables
363 */
364 .align 5
365 ENTRY(cpu_arm1020_switch_mm)
366 #ifdef CONFIG_MMU
367 #ifndef CONFIG_CPU_DCACHE_DISABLE
368 mcr p15, 0, r3, c7, c10, 4
369 mov r1, #0xF @ 16 segments
370 1: mov r3, #0x3F @ 64 entries
371 2: mov ip, r3, LSL #26 @ shift up entry
372 orr ip, ip, r1, LSL #5 @ shift in/up index
373 mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
374 mov ip, #0
375 mcr p15, 0, ip, c7, c10, 4
376 subs r3, r3, #1
377 cmp r3, #0
378 bge 2b @ entries 3F to 0
379 subs r1, r1, #1
380 cmp r1, #0
381 bge 1b @ segments 15 to 0
383 #endif
384 mov r1, #0
385 #ifndef CONFIG_CPU_ICACHE_DISABLE
386 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
387 #endif
388 mcr p15, 0, r1, c7, c10, 4 @ drain WB
389 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
390 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
391 #endif /* CONFIG_MMU */
392 mov pc, lr
394 /*
395 * cpu_arm1020_set_pte(ptep, pte)
396 *
397 * Set a PTE and flush it out
398 */
399 .align 5
400 ENTRY(cpu_arm1020_set_pte_ext)
401 #ifdef CONFIG_MMU
402 armv3_set_pte_ext
403 mov r0, r0
404 #ifndef CONFIG_CPU_DCACHE_DISABLE
405 mcr p15, 0, r0, c7, c10, 4
406 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
407 #endif
408 mcr p15, 0, r0, c7, c10, 4 @ drain WB
409 #endif /* CONFIG_MMU */
410 mov pc, lr
412 __INIT
414 .type __arm1020_setup, #function
415 __arm1020_setup:
416 mov r0, #0
417 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
418 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
419 #ifdef CONFIG_MMU
420 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
421 #endif
423 adr r5, arm1020_crval
424 ldmia r5, {r5, r6}
425 mrc p15, 0, r0, c1, c0 @ get control register v4
426 bic r0, r0, r5
427 orr r0, r0, r6
428 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
429 orr r0, r0, #0x4000 @ .R.. .... .... ....
430 #endif
431 mov pc, lr
432 .size __arm1020_setup, . - __arm1020_setup
434 /*
435 * R
436 * .RVI ZFRS BLDP WCAM
437 * .011 1001 ..11 0101
438 */
439 .type arm1020_crval, #object
440 arm1020_crval:
441 crval clear=0x0000593f, mmuset=0x00003935, ucset=0x00001930
443 __INITDATA
445 /*
446 * Purpose : Function pointers used to access above functions - all calls
447 * come through these
448 */
449 .type arm1020_processor_functions, #object
450 arm1020_processor_functions:
451 .word v4t_early_abort
452 .word legacy_pabort
453 .word cpu_arm1020_proc_init
454 .word cpu_arm1020_proc_fin
455 .word cpu_arm1020_reset
456 .word cpu_arm1020_do_idle
457 .word cpu_arm1020_dcache_clean_area
458 .word cpu_arm1020_switch_mm
459 .word cpu_arm1020_set_pte_ext
460 .size arm1020_processor_functions, . - arm1020_processor_functions
462 .section ".rodata"
464 .type cpu_arch_name, #object
465 cpu_arch_name:
466 .asciz "armv5t"
467 .size cpu_arch_name, . - cpu_arch_name
469 .type cpu_elf_name, #object
470 cpu_elf_name:
471 .asciz "v5"
472 .size cpu_elf_name, . - cpu_elf_name
474 .type cpu_arm1020_name, #object
475 cpu_arm1020_name:
476 .ascii "ARM1020"
477 #ifndef CONFIG_CPU_ICACHE_DISABLE
478 .ascii "i"
479 #endif
480 #ifndef CONFIG_CPU_DCACHE_DISABLE
481 .ascii "d"
482 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
483 .ascii "(wt)"
484 #else
485 .ascii "(wb)"
486 #endif
487 #endif
488 #ifndef CONFIG_CPU_BPREDICT_DISABLE
489 .ascii "B"
490 #endif
491 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
492 .ascii "RR"
493 #endif
494 .ascii "\0"
495 .size cpu_arm1020_name, . - cpu_arm1020_name
497 .align
499 .section ".proc.info.init", #alloc, #execinstr
501 .type __arm1020_proc_info,#object
502 __arm1020_proc_info:
503 .long 0x4104a200 @ ARM 1020T (Architecture v5T)
504 .long 0xff0ffff0
505 .long PMD_TYPE_SECT | \
506 PMD_SECT_AP_WRITE | \
507 PMD_SECT_AP_READ
508 .long PMD_TYPE_SECT | \
509 PMD_SECT_AP_WRITE | \
510 PMD_SECT_AP_READ
511 b __arm1020_setup
512 .long cpu_arch_name
513 .long cpu_elf_name
514 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
515 .long cpu_arm1020_name
516 .long arm1020_processor_functions
517 .long v4wbi_tlb_fns
518 .long v4wb_user_fns
519 .long arm1020_cache_fns
520 .size __arm1020_proc_info, . - __arm1020_proc_info