| blob | 7d042dc20c47a77855b258457478e1d0dceb8c96 |
1 /*
2 * linux/arch/arm/mm/proc-arm926.S: MMU functions for ARM926EJ-S
3 *
4 * Copyright (C) 1999-2001 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 arm926.
24 *
25 * CONFIG_CPU_ARM926_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/pgtable.h>
32 #include <asm/procinfo.h>
33 #include <asm/hardware.h>
34 #include <asm/page.h>
35 #include <asm/ptrace.h>
36 #include "proc-macros.S"
38 /*
39 * This is the maximum size of an area which will be invalidated
40 * using the single invalidate entry instructions. Anything larger
41 * than this, and we go for the whole cache.
42 *
43 * This value should be chosen such that we choose the cheapest
44 * alternative.
45 */
46 #define CACHE_DLIMIT 16384
48 /*
49 * the cache line size of the I and D cache
50 */
51 #define CACHE_DLINESIZE 32
53 .text
54 /*
55 * cpu_arm926_proc_init()
56 */
57 ENTRY(cpu_arm926_proc_init)
58 mov pc, lr
60 /*
61 * cpu_arm926_proc_fin()
62 */
63 ENTRY(cpu_arm926_proc_fin)
64 stmfd sp!, {lr}
65 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
66 msr cpsr_c, ip
67 bl arm926_flush_kern_cache_all
68 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
69 bic r0, r0, #0x1000 @ ...i............
70 bic r0, r0, #0x000e @ ............wca.
71 mcr p15, 0, r0, c1, c0, 0 @ disable caches
72 ldmfd sp!, {pc}
74 /*
75 * cpu_arm926_reset(loc)
76 *
77 * Perform a soft reset of the system. Put the CPU into the
78 * same state as it would be if it had been reset, and branch
79 * to what would be the reset vector.
80 *
81 * loc: location to jump to for soft reset
82 */
83 .align 5
84 ENTRY(cpu_arm926_reset)
85 mov ip, #0
86 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
87 mcr p15, 0, ip, c7, c10, 4 @ drain WB
88 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
89 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
90 bic ip, ip, #0x000f @ ............wcam
91 bic ip, ip, #0x1100 @ ...i...s........
92 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
93 mov pc, r0
95 /*
96 * cpu_arm926_do_idle()
97 *
98 * Called with IRQs disabled
99 */
100 .align 10
101 ENTRY(cpu_arm926_do_idle)
102 mov r0, #0
103 mrc p15, 0, r1, c1, c0, 0 @ Read control register
104 mcr p15, 0, r0, c7, c10, 4 @ Drain write buffer
105 bic r2, r1, #1 << 12
106 mcr p15, 0, r2, c1, c0, 0 @ Disable I cache
107 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
108 mcr p15, 0, r1, c1, c0, 0 @ Restore ICache enable
109 mov pc, lr
111 /*
112 * flush_user_cache_all()
113 *
114 * Clean and invalidate all cache entries in a particular
115 * address space.
116 */
117 ENTRY(arm926_flush_user_cache_all)
118 /* FALLTHROUGH */
120 /*
121 * flush_kern_cache_all()
122 *
123 * Clean and invalidate the entire cache.
124 */
125 ENTRY(arm926_flush_kern_cache_all)
126 mov r2, #VM_EXEC
127 mov ip, #0
128 __flush_whole_cache:
129 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
130 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
131 #else
132 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
133 bne 1b
134 #endif
135 tst r2, #VM_EXEC
136 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
137 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
138 mov pc, lr
140 /*
141 * flush_user_cache_range(start, end, flags)
142 *
143 * Clean and invalidate a range of cache entries in the
144 * specified address range.
145 *
146 * - start - start address (inclusive)
147 * - end - end address (exclusive)
148 * - flags - vm_flags describing address space
149 */
150 ENTRY(arm926_flush_user_cache_range)
151 mov ip, #0
152 sub r3, r1, r0 @ calculate total size
153 cmp r3, #CACHE_DLIMIT
154 bgt __flush_whole_cache
155 1: tst r2, #VM_EXEC
156 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
157 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
158 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
159 add r0, r0, #CACHE_DLINESIZE
160 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
161 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
162 add r0, r0, #CACHE_DLINESIZE
163 #else
164 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
165 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
166 add r0, r0, #CACHE_DLINESIZE
167 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
168 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
169 add r0, r0, #CACHE_DLINESIZE
170 #endif
171 cmp r0, r1
172 blo 1b
173 tst r2, #VM_EXEC
174 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
175 mov pc, lr
177 /*
178 * coherent_kern_range(start, end)
179 *
180 * Ensure coherency between the Icache and the Dcache in the
181 * region described by start, end. If you have non-snooping
182 * Harvard caches, you need to implement this function.
183 *
184 * - start - virtual start address
185 * - end - virtual end address
186 */
187 ENTRY(arm926_coherent_kern_range)
188 /* FALLTHROUGH */
190 /*
191 * coherent_user_range(start, end)
192 *
193 * Ensure coherency between the Icache and the Dcache in the
194 * region described by start, end. If you have non-snooping
195 * Harvard caches, you need to implement this function.
196 *
197 * - start - virtual start address
198 * - end - virtual end address
199 */
200 ENTRY(arm926_coherent_user_range)
201 bic r0, r0, #CACHE_DLINESIZE - 1
202 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
203 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
204 add r0, r0, #CACHE_DLINESIZE
205 cmp r0, r1
206 blo 1b
207 mcr p15, 0, r0, c7, c10, 4 @ drain WB
208 mov pc, lr
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 * - addr - page aligned address
217 */
218 ENTRY(arm926_flush_kern_dcache_page)
219 add r1, r0, #PAGE_SZ
220 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
221 add r0, r0, #CACHE_DLINESIZE
222 cmp r0, r1
223 blo 1b
224 mov r0, #0
225 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
226 mcr p15, 0, r0, c7, c10, 4 @ drain WB
227 mov pc, lr
229 /*
230 * dma_inv_range(start, end)
231 *
232 * Invalidate (discard) the specified virtual address range.
233 * May not write back any entries. If 'start' or 'end'
234 * are not cache line aligned, those lines must be written
235 * back.
236 *
237 * - start - virtual start address
238 * - end - virtual end address
239 *
240 * (same as v4wb)
241 */
242 ENTRY(arm926_dma_inv_range)
243 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
244 tst r0, #CACHE_DLINESIZE - 1
245 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
246 tst r1, #CACHE_DLINESIZE - 1
247 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
248 #endif
249 bic r0, r0, #CACHE_DLINESIZE - 1
250 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
251 add r0, r0, #CACHE_DLINESIZE
252 cmp r0, r1
253 blo 1b
254 mcr p15, 0, r0, c7, c10, 4 @ drain WB
255 mov pc, lr
257 /*
258 * dma_clean_range(start, end)
259 *
260 * Clean the specified virtual address range.
261 *
262 * - start - virtual start address
263 * - end - virtual end address
264 *
265 * (same as v4wb)
266 */
267 ENTRY(arm926_dma_clean_range)
268 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
269 bic r0, r0, #CACHE_DLINESIZE - 1
270 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
271 add r0, r0, #CACHE_DLINESIZE
272 cmp r0, r1
273 blo 1b
274 #endif
275 mcr p15, 0, r0, c7, c10, 4 @ drain WB
276 mov pc, lr
278 /*
279 * dma_flush_range(start, end)
280 *
281 * Clean and invalidate the specified virtual address range.
282 *
283 * - start - virtual start address
284 * - end - virtual end address
285 */
286 ENTRY(arm926_dma_flush_range)
287 bic r0, r0, #CACHE_DLINESIZE - 1
288 1:
289 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
290 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
291 #else
292 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
293 #endif
294 add r0, r0, #CACHE_DLINESIZE
295 cmp r0, r1
296 blo 1b
297 mcr p15, 0, r0, c7, c10, 4 @ drain WB
298 mov pc, lr
300 ENTRY(arm926_cache_fns)
301 .long arm926_flush_kern_cache_all
302 .long arm926_flush_user_cache_all
303 .long arm926_flush_user_cache_range
304 .long arm926_coherent_kern_range
305 .long arm926_coherent_user_range
306 .long arm926_flush_kern_dcache_page
307 .long arm926_dma_inv_range
308 .long arm926_dma_clean_range
309 .long arm926_dma_flush_range
311 ENTRY(cpu_arm926_dcache_clean_area)
312 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
313 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
314 add r0, r0, #CACHE_DLINESIZE
315 subs r1, r1, #CACHE_DLINESIZE
316 bhi 1b
317 #endif
318 mcr p15, 0, r0, c7, c10, 4 @ drain WB
319 mov pc, lr
321 /* =============================== PageTable ============================== */
323 /*
324 * cpu_arm926_switch_mm(pgd)
325 *
326 * Set the translation base pointer to be as described by pgd.
327 *
328 * pgd: new page tables
329 */
330 .align 5
331 ENTRY(cpu_arm926_switch_mm)
332 mov ip, #0
333 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
334 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
335 #else
336 @ && 'Clean & Invalidate whole DCache'
337 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
338 bne 1b
339 #endif
340 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
341 mcr p15, 0, ip, c7, c10, 4 @ drain WB
342 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
343 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
344 mov pc, lr
346 /*
347 * cpu_arm926_set_pte(ptep, pte)
348 *
349 * Set a PTE and flush it out
350 */
351 .align 5
352 ENTRY(cpu_arm926_set_pte)
353 str r1, [r0], #-2048 @ linux version
355 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
357 bic r2, r1, #PTE_SMALL_AP_MASK
358 bic r2, r2, #PTE_TYPE_MASK
359 orr r2, r2, #PTE_TYPE_SMALL
361 tst r1, #L_PTE_USER @ User?
362 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
364 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
365 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
367 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
368 movne r2, #0
370 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
371 eor r3, r2, #0x0a @ C & small page?
372 tst r3, #0x0b
373 biceq r2, r2, #4
374 #endif
375 str r2, [r0] @ hardware version
376 mov r0, r0
377 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
378 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
379 #endif
380 mcr p15, 0, r0, c7, c10, 4 @ drain WB
381 mov pc, lr
383 __INIT
385 .type __arm926_setup, #function
386 __arm926_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
390 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
393 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
394 mov r0, #4 @ disable write-back on caches explicitly
395 mcr p15, 7, r0, c15, c0, 0
396 #endif
398 mrc p15, 0, r0, c1, c0 @ get control register v4
399 ldr r5, arm926_cr1_clear
400 bic r0, r0, r5
401 ldr r5, arm926_cr1_set
402 orr r0, r0, r5
403 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
404 orr r0, r0, #0x4000 @ .1.. .... .... ....
405 #endif
406 mov pc, lr
407 .size __arm926_setup, . - __arm926_setup
409 /*
410 * R
411 * .RVI ZFRS BLDP WCAM
412 * .011 0001 ..11 0101
413 *
414 */
415 .type arm926_cr1_clear, #object
416 .type arm926_cr1_set, #object
417 arm926_cr1_clear:
418 .word 0x7f3f
419 arm926_cr1_set:
420 .word 0x3135
422 __INITDATA
424 /*
425 * Purpose : Function pointers used to access above functions - all calls
426 * come through these
427 */
428 .type arm926_processor_functions, #object
429 arm926_processor_functions:
430 .word v5tj_early_abort
431 .word cpu_arm926_proc_init
432 .word cpu_arm926_proc_fin
433 .word cpu_arm926_reset
434 .word cpu_arm926_do_idle
435 .word cpu_arm926_dcache_clean_area
436 .word cpu_arm926_switch_mm
437 .word cpu_arm926_set_pte
438 .size arm926_processor_functions, . - arm926_processor_functions
440 .section ".rodata"
442 .type cpu_arch_name, #object
443 cpu_arch_name:
444 .asciz "armv5tej"
445 .size cpu_arch_name, . - cpu_arch_name
447 .type cpu_elf_name, #object
448 cpu_elf_name:
449 .asciz "v5"
450 .size cpu_elf_name, . - cpu_elf_name
452 .type cpu_arm926_name, #object
453 cpu_arm926_name:
454 .ascii "ARM926EJ-S"
455 #ifndef CONFIG_CPU_ICACHE_DISABLE
456 .ascii "i"
457 #endif
458 #ifndef CONFIG_CPU_DCACHE_DISABLE
459 .ascii "d"
460 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
461 .ascii "(wt)"
462 #else
463 .ascii "(wb)"
464 #endif
465 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
466 .ascii "RR"
467 #endif
468 #endif
469 .ascii "\0"
470 .size cpu_arm926_name, . - cpu_arm926_name
472 .align
474 .section ".proc.info.init", #alloc, #execinstr
476 .type __arm926_proc_info,#object
477 __arm926_proc_info:
478 .long 0x41069260 @ ARM926EJ-S (v5TEJ)
479 .long 0xff0ffff0
480 .long PMD_TYPE_SECT | \
481 PMD_SECT_BUFFERABLE | \
482 PMD_SECT_CACHEABLE | \
483 PMD_BIT4 | \
484 PMD_SECT_AP_WRITE | \
485 PMD_SECT_AP_READ
486 b __arm926_setup
487 .long cpu_arch_name
488 .long cpu_elf_name
489 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA
490 .long cpu_arm926_name
491 .long arm926_processor_functions
492 .long v4wbi_tlb_fns
493 .long v4wb_user_fns
494 .long arm926_cache_fns
495 .size __arm926_proc_info, . - __arm926_proc_info