| blob | 82ec954e45b6b67951e4d0a8e4fe0a86ee314bba |
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 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 *
22 * These are the low level assembler for performing cache and TLB
23 * functions on the arm1020.
24 *
25 * CONFIG_CPU_ARM1020_CPU_IDLE -> nohlt
26 */
27 #include <linux/linkage.h>
28 #include <linux/config.h>
29 #include <linux/init.h>
30 #include <asm/assembler.h>
31 #include <asm/asm-offsets.h>
32 #include <asm/pgtable.h>
33 #include <asm/procinfo.h>
34 #include <asm/ptrace.h>
35 #include <asm/hardware.h>
37 /*
38 * This is the maximum size of an area which will be invalidated
39 * using the single invalidate entry instructions. Anything larger
40 * than this, and we go for the whole cache.
41 *
42 * This value should be chosen such that we choose the cheapest
43 * alternative.
44 */
45 #define MAX_AREA_SIZE 32768
47 /*
48 * The size of one data cache line.
49 */
50 #define CACHE_DLINESIZE 32
52 /*
53 * The number of data cache segments.
54 */
55 #define CACHE_DSEGMENTS 16
57 /*
58 * The number of lines in a cache segment.
59 */
60 #define CACHE_DENTRIES 64
62 /*
63 * This is the size at which it becomes more efficient to
64 * clean the whole cache, rather than using the individual
65 * cache line maintainence instructions.
66 */
67 #define CACHE_DLIMIT 32768
69 .text
70 /*
71 * cpu_arm1020_proc_init()
72 */
73 ENTRY(cpu_arm1020_proc_init)
74 mov pc, lr
76 /*
77 * cpu_arm1020_proc_fin()
78 */
79 ENTRY(cpu_arm1020_proc_fin)
80 stmfd sp!, {lr}
81 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
82 msr cpsr_c, ip
83 bl arm1020_flush_kern_cache_all
84 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
85 bic r0, r0, #0x1000 @ ...i............
86 bic r0, r0, #0x000e @ ............wca.
87 mcr p15, 0, r0, c1, c0, 0 @ disable caches
88 ldmfd sp!, {pc}
90 /*
91 * cpu_arm1020_reset(loc)
92 *
93 * Perform a soft reset of the system. Put the CPU into the
94 * same state as it would be if it had been reset, and branch
95 * to what would be the reset vector.
96 *
97 * loc: location to jump to for soft reset
98 */
99 .align 5
100 ENTRY(cpu_arm1020_reset)
101 mov ip, #0
102 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
103 mcr p15, 0, ip, c7, c10, 4 @ drain WB
104 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
105 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
106 bic ip, ip, #0x000f @ ............wcam
107 bic ip, ip, #0x1100 @ ...i...s........
108 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
109 mov pc, r0
111 /*
112 * cpu_arm1020_do_idle()
113 */
114 .align 5
115 ENTRY(cpu_arm1020_do_idle)
116 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
117 mov pc, lr
119 /* ================================= CACHE ================================ */
121 .align 5
122 /*
123 * flush_user_cache_all()
124 *
125 * Invalidate all cache entries in a particular address
126 * space.
127 */
128 ENTRY(arm1020_flush_user_cache_all)
129 /* FALLTHROUGH */
130 /*
131 * flush_kern_cache_all()
132 *
133 * Clean and invalidate the entire cache.
134 */
135 ENTRY(arm1020_flush_kern_cache_all)
136 mov r2, #VM_EXEC
137 mov ip, #0
138 __flush_whole_cache:
139 #ifndef CONFIG_CPU_DCACHE_DISABLE
140 mcr p15, 0, ip, c7, c10, 4 @ drain WB
141 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
142 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
143 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
144 mcr p15, 0, ip, c7, c10, 4 @ drain WB
145 subs r3, r3, #1 << 26
146 bcs 2b @ entries 63 to 0
147 subs r1, r1, #1 << 5
148 bcs 1b @ segments 15 to 0
149 #endif
150 tst r2, #VM_EXEC
151 #ifndef CONFIG_CPU_ICACHE_DISABLE
152 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
153 #endif
154 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
155 mov pc, lr
157 /*
158 * flush_user_cache_range(start, end, flags)
159 *
160 * Invalidate a range of cache entries in the specified
161 * address space.
162 *
163 * - start - start address (inclusive)
164 * - end - end address (exclusive)
165 * - flags - vm_flags for this space
166 */
167 ENTRY(arm1020_flush_user_cache_range)
168 mov ip, #0
169 sub r3, r1, r0 @ calculate total size
170 cmp r3, #CACHE_DLIMIT
171 bhs __flush_whole_cache
173 #ifndef CONFIG_CPU_DCACHE_DISABLE
174 mcr p15, 0, ip, c7, c10, 4
175 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
176 mcr p15, 0, ip, c7, c10, 4 @ drain WB
177 add r0, r0, #CACHE_DLINESIZE
178 cmp r0, r1
179 blo 1b
180 #endif
181 tst r2, #VM_EXEC
182 #ifndef CONFIG_CPU_ICACHE_DISABLE
183 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
184 #endif
185 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
186 mov pc, lr
188 /*
189 * coherent_kern_range(start, end)
190 *
191 * Ensure coherency between the Icache and the Dcache in the
192 * region described by start. If you have non-snooping
193 * Harvard caches, you need to implement this function.
194 *
195 * - start - virtual start address
196 * - end - virtual end address
197 */
198 ENTRY(arm1020_coherent_kern_range)
199 /* FALLTRHOUGH */
201 /*
202 * coherent_user_range(start, end)
203 *
204 * Ensure coherency between the Icache and the Dcache in the
205 * region described by start. If you have non-snooping
206 * Harvard caches, you need to implement this function.
207 *
208 * - start - virtual start address
209 * - end - virtual end address
210 */
211 ENTRY(arm1020_coherent_user_range)
212 mov ip, #0
213 bic r0, r0, #CACHE_DLINESIZE - 1
214 mcr p15, 0, ip, c7, c10, 4
215 1:
216 #ifndef CONFIG_CPU_DCACHE_DISABLE
217 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
218 mcr p15, 0, ip, c7, c10, 4 @ drain WB
219 #endif
220 #ifndef CONFIG_CPU_ICACHE_DISABLE
221 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
222 #endif
223 add r0, r0, #CACHE_DLINESIZE
224 cmp r0, r1
225 blo 1b
226 mcr p15, 0, ip, c7, c10, 4 @ drain WB
227 mov pc, lr
229 /*
230 * flush_kern_dcache_page(void *page)
231 *
232 * Ensure no D cache aliasing occurs, either with itself or
233 * the I cache
234 *
235 * - page - page aligned address
236 */
237 ENTRY(arm1020_flush_kern_dcache_page)
238 mov ip, #0
239 #ifndef CONFIG_CPU_DCACHE_DISABLE
240 add r1, r0, #PAGE_SZ
241 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
242 mcr p15, 0, ip, c7, c10, 4 @ drain WB
243 add r0, r0, #CACHE_DLINESIZE
244 cmp r0, r1
245 blo 1b
246 #endif
247 mcr p15, 0, ip, c7, c10, 4 @ drain WB
248 mov pc, lr
250 /*
251 * dma_inv_range(start, end)
252 *
253 * Invalidate (discard) the specified virtual address range.
254 * May not write back any entries. If 'start' or 'end'
255 * are not cache line aligned, those lines must be written
256 * back.
257 *
258 * - start - virtual start address
259 * - end - virtual end address
260 *
261 * (same as v4wb)
262 */
263 ENTRY(arm1020_dma_inv_range)
264 mov ip, #0
265 #ifndef CONFIG_CPU_DCACHE_DISABLE
266 tst r0, #CACHE_DLINESIZE - 1
267 bic r0, r0, #CACHE_DLINESIZE - 1
268 mcrne p15, 0, ip, c7, c10, 4
269 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
270 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
271 tst r1, #CACHE_DLINESIZE - 1
272 mcrne p15, 0, ip, c7, c10, 4
273 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
274 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
275 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
276 add r0, r0, #CACHE_DLINESIZE
277 cmp r0, r1
278 blo 1b
279 #endif
280 mcr p15, 0, ip, c7, c10, 4 @ drain WB
281 mov pc, lr
283 /*
284 * dma_clean_range(start, end)
285 *
286 * Clean the specified virtual address range.
287 *
288 * - start - virtual start address
289 * - end - virtual end address
290 *
291 * (same as v4wb)
292 */
293 ENTRY(arm1020_dma_clean_range)
294 mov ip, #0
295 #ifndef CONFIG_CPU_DCACHE_DISABLE
296 bic r0, r0, #CACHE_DLINESIZE - 1
297 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
298 mcr p15, 0, ip, c7, c10, 4 @ drain WB
299 add r0, r0, #CACHE_DLINESIZE
300 cmp r0, r1
301 blo 1b
302 #endif
303 mcr p15, 0, ip, c7, c10, 4 @ drain WB
304 mov pc, lr
306 /*
307 * dma_flush_range(start, end)
308 *
309 * Clean and invalidate the specified virtual address range.
310 *
311 * - start - virtual start address
312 * - end - virtual end address
313 */
314 ENTRY(arm1020_dma_flush_range)
315 mov ip, #0
316 #ifndef CONFIG_CPU_DCACHE_DISABLE
317 bic r0, r0, #CACHE_DLINESIZE - 1
318 mcr p15, 0, ip, c7, c10, 4
319 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
320 mcr p15, 0, ip, c7, c10, 4 @ drain WB
321 add r0, r0, #CACHE_DLINESIZE
322 cmp r0, r1
323 blo 1b
324 #endif
325 mcr p15, 0, ip, c7, c10, 4 @ drain WB
326 mov pc, lr
328 ENTRY(arm1020_cache_fns)
329 .long arm1020_flush_kern_cache_all
330 .long arm1020_flush_user_cache_all
331 .long arm1020_flush_user_cache_range
332 .long arm1020_coherent_kern_range
333 .long arm1020_coherent_user_range
334 .long arm1020_flush_kern_dcache_page
335 .long arm1020_dma_inv_range
336 .long arm1020_dma_clean_range
337 .long arm1020_dma_flush_range
339 .align 5
340 ENTRY(cpu_arm1020_dcache_clean_area)
341 #ifndef CONFIG_CPU_DCACHE_DISABLE
342 mov ip, #0
343 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
344 mcr p15, 0, ip, c7, c10, 4 @ drain WB
345 add r0, r0, #CACHE_DLINESIZE
346 subs r1, r1, #CACHE_DLINESIZE
347 bhi 1b
348 #endif
349 mov pc, lr
351 /* =============================== PageTable ============================== */
353 /*
354 * cpu_arm1020_switch_mm(pgd)
355 *
356 * Set the translation base pointer to be as described by pgd.
357 *
358 * pgd: new page tables
359 */
360 .align 5
361 ENTRY(cpu_arm1020_switch_mm)
362 #ifndef CONFIG_CPU_DCACHE_DISABLE
363 mcr p15, 0, r3, c7, c10, 4
364 mov r1, #0xF @ 16 segments
365 1: mov r3, #0x3F @ 64 entries
366 2: mov ip, r3, LSL #26 @ shift up entry
367 orr ip, ip, r1, LSL #5 @ shift in/up index
368 mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
369 mov ip, #0
370 mcr p15, 0, ip, c7, c10, 4
371 subs r3, r3, #1
372 cmp r3, #0
373 bge 2b @ entries 3F to 0
374 subs r1, r1, #1
375 cmp r1, #0
376 bge 1b @ segments 15 to 0
378 #endif
379 mov r1, #0
380 #ifndef CONFIG_CPU_ICACHE_DISABLE
381 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
382 #endif
383 mcr p15, 0, r1, c7, c10, 4 @ drain WB
384 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
385 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
386 mov pc, lr
388 /*
389 * cpu_arm1020_set_pte(ptep, pte)
390 *
391 * Set a PTE and flush it out
392 */
393 .align 5
394 ENTRY(cpu_arm1020_set_pte)
395 str r1, [r0], #-2048 @ linux version
397 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
399 bic r2, r1, #PTE_SMALL_AP_MASK
400 bic r2, r2, #PTE_TYPE_MASK
401 orr r2, r2, #PTE_TYPE_SMALL
403 tst r1, #L_PTE_USER @ User?
404 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
406 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
407 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
409 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
410 movne r2, #0
412 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
413 eor r3, r1, #0x0a @ C & small page?
414 tst r3, #0x0b
415 biceq r2, r2, #4
416 #endif
417 str r2, [r0] @ hardware version
418 mov r0, r0
419 #ifndef CONFIG_CPU_DCACHE_DISABLE
420 mcr p15, 0, r0, c7, c10, 4
421 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
422 #endif
423 mcr p15, 0, r0, c7, c10, 4 @ drain WB
424 mov pc, lr
426 __INIT
428 .type __arm1020_setup, #function
429 __arm1020_setup:
430 mov r0, #0
431 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
432 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
433 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
434 mrc p15, 0, r0, c1, c0 @ get control register v4
435 ldr r5, arm1020_cr1_clear
436 bic r0, r0, r5
437 ldr r5, arm1020_cr1_set
438 orr r0, r0, r5
439 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
440 orr r0, r0, #0x4000 @ .R.. .... .... ....
441 #endif
442 mov pc, lr
443 .size __arm1020_setup, . - __arm1020_setup
445 /*
446 * R
447 * .RVI ZFRS BLDP WCAM
448 * .011 1001 ..11 0101
449 */
450 .type arm1020_cr1_clear, #object
451 .type arm1020_cr1_set, #object
452 arm1020_cr1_clear:
453 .word 0x593f
454 arm1020_cr1_set:
455 .word 0x3935
457 __INITDATA
459 /*
460 * Purpose : Function pointers used to access above functions - all calls
461 * come through these
462 */
463 .type arm1020_processor_functions, #object
464 arm1020_processor_functions:
465 .word v4t_early_abort
466 .word cpu_arm1020_proc_init
467 .word cpu_arm1020_proc_fin
468 .word cpu_arm1020_reset
469 .word cpu_arm1020_do_idle
470 .word cpu_arm1020_dcache_clean_area
471 .word cpu_arm1020_switch_mm
472 .word cpu_arm1020_set_pte
473 .size arm1020_processor_functions, . - arm1020_processor_functions
475 .section ".rodata"
477 .type cpu_arch_name, #object
478 cpu_arch_name:
479 .asciz "armv5t"
480 .size cpu_arch_name, . - cpu_arch_name
482 .type cpu_elf_name, #object
483 cpu_elf_name:
484 .asciz "v5"
485 .size cpu_elf_name, . - cpu_elf_name
487 .type cpu_arm1020_name, #object
488 cpu_arm1020_name:
489 .ascii "ARM1020"
490 #ifndef CONFIG_CPU_ICACHE_DISABLE
491 .ascii "i"
492 #endif
493 #ifndef CONFIG_CPU_DCACHE_DISABLE
494 .ascii "d"
495 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
496 .ascii "(wt)"
497 #else
498 .ascii "(wb)"
499 #endif
500 #endif
501 #ifndef CONFIG_CPU_BPREDICT_DISABLE
502 .ascii "B"
503 #endif
504 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
505 .ascii "RR"
506 #endif
507 .ascii "\0"
508 .size cpu_arm1020_name, . - cpu_arm1020_name
510 .align
512 .section ".proc.info.init", #alloc, #execinstr
514 .type __arm1020_proc_info,#object
515 __arm1020_proc_info:
516 .long 0x4104a200 @ ARM 1020T (Architecture v5T)
517 .long 0xff0ffff0
518 .long PMD_TYPE_SECT | \
519 PMD_SECT_AP_WRITE | \
520 PMD_SECT_AP_READ
521 b __arm1020_setup
522 .long cpu_arch_name
523 .long cpu_elf_name
524 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
525 .long cpu_arm1020_name
526 .long arm1020_processor_functions
527 .long v4wbi_tlb_fns
528 .long v4wb_user_fns
529 .long arm1020_cache_fns
530 .size __arm1020_proc_info, . - __arm1020_proc_info