| blob | 65e43a1090855df170c30b2b8fa576c4c7803e1d |
1 /*
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.
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 *
14 * These are the low level assembler for performing cache and TLB
15 * functions on the ARM1026EJ-S.
16 */
17 #include <linux/linkage.h>
18 #include <linux/init.h>
19 #include <asm/assembler.h>
20 #include <asm/asm-offsets.h>
21 #include <asm/elf.h>
22 #include <asm/pgtable-hwdef.h>
23 #include <asm/pgtable.h>
24 #include <asm/ptrace.h>
26 #include "proc-macros.S"
28 /*
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
38 /*
39 * The size of one data cache line.
40 */
41 #define CACHE_DLINESIZE 32
43 /*
44 * The number of data cache segments.
45 */
46 #define CACHE_DSEGMENTS 16
48 /*
49 * The number of lines in a cache segment.
50 */
51 #define CACHE_DENTRIES 64
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
60 .text
61 /*
62 * cpu_arm1026_proc_init()
63 */
64 ENTRY(cpu_arm1026_proc_init)
65 mov pc, lr
67 /*
68 * cpu_arm1026_proc_fin()
69 */
70 ENTRY(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}
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
91 ENTRY(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
95 #ifdef CONFIG_MMU
96 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
97 #endif
98 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
104 /*
105 * cpu_arm1026_do_idle()
106 */
107 .align 5
108 ENTRY(cpu_arm1026_do_idle)
109 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
110 mov pc, lr
112 /* ================================= CACHE ================================ */
114 .align 5
115 /*
116 * flush_user_cache_all()
117 *
118 * Invalidate all cache entries in a particular address
119 * space.
120 */
121 ENTRY(arm1026_flush_user_cache_all)
122 /* FALLTHROUGH */
123 /*
124 * flush_kern_cache_all()
125 *
126 * Clean and invalidate the entire cache.
127 */
128 ENTRY(arm1026_flush_kern_cache_all)
129 mov r2, #VM_EXEC
130 mov ip, #0
131 __flush_whole_cache:
132 #ifndef CONFIG_CPU_DCACHE_DISABLE
133 1: 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
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 */
153 ENTRY(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
159 #ifndef CONFIG_CPU_DCACHE_DISABLE
160 1: 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
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 */
182 ENTRY(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 */
194 ENTRY(arm1026_coherent_user_range)
195 mov ip, #0
196 bic r0, r0, #CACHE_DLINESIZE - 1
197 1:
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
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 */
218 ENTRY(arm1026_flush_kern_dcache_page)
219 mov ip, #0
220 #ifndef CONFIG_CPU_DCACHE_DISABLE
221 add r1, r0, #PAGE_SZ
222 1: 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
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 */
243 ENTRY(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
251 1: 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
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 */
269 ENTRY(arm1026_dma_clean_range)
270 mov ip, #0
271 #ifndef CONFIG_CPU_DCACHE_DISABLE
272 bic r0, r0, #CACHE_DLINESIZE - 1
273 1: 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
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 */
289 ENTRY(arm1026_dma_flush_range)
290 mov ip, #0
291 #ifndef CONFIG_CPU_DCACHE_DISABLE
292 bic r0, r0, #CACHE_DLINESIZE - 1
293 1: 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
301 ENTRY(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
312 .align 5
313 ENTRY(cpu_arm1026_dcache_clean_area)
314 #ifndef CONFIG_CPU_DCACHE_DISABLE
315 mov ip, #0
316 1: 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
323 /* =============================== PageTable ============================== */
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
333 ENTRY(cpu_arm1026_switch_mm)
334 #ifdef CONFIG_MMU
335 mov r1, #0
336 #ifndef CONFIG_CPU_DCACHE_DISABLE
337 1: 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
346 #endif
347 mov pc, lr
349 /*
350 * cpu_arm1026_set_pte_ext(ptep, pte, ext)
351 *
352 * Set a PTE and flush it out
353 */
354 .align 5
355 ENTRY(cpu_arm1026_set_pte_ext)
356 #ifdef CONFIG_MMU
357 str r1, [r0], #-2048 @ linux version
359 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
361 bic r2, r1, #PTE_SMALL_AP_MASK
362 bic r2, r2, #PTE_TYPE_MASK
363 orr r2, r2, #PTE_TYPE_SMALL
365 tst r1, #L_PTE_USER @ User?
366 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
368 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
369 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
371 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
372 movne r2, #0
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
384 #endif /* CONFIG_MMU */
385 mov pc, lr
388 __INIT
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
395 #ifdef CONFIG_MMU
396 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
397 mcr p15, 0, r4, c2, c0 @ load page table pointer
398 #endif
399 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
400 mov r0, #4 @ explicitly disable writeback
401 mcr p15, 7, r0, c15, c0, 0
402 #endif
403 adr r5, arm1026_crval
404 ldmia r5, {r5, r6}
405 mrc p15, 0, r0, c1, c0 @ get control register v4
406 bic r0, r0, r5
407 orr r0, r0, r6
408 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
409 orr r0, r0, #0x4000 @ .R.. .... .... ....
410 #endif
411 mov pc, lr
412 .size __arm1026_setup, . - __arm1026_setup
414 /*
415 * R
416 * .RVI ZFRS BLDP WCAM
417 * .011 1001 ..11 0101
418 *
419 */
420 .type arm1026_crval, #object
421 arm1026_crval:
422 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001934
424 __INITDATA
426 /*
427 * Purpose : Function pointers used to access above functions - all calls
428 * come through these
429 */
430 .type arm1026_processor_functions, #object
431 arm1026_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
439 .word cpu_arm1026_set_pte_ext
440 .size arm1026_processor_functions, . - arm1026_processor_functions
442 .section .rodata
444 .type cpu_arch_name, #object
445 cpu_arch_name:
446 .asciz "armv5tej"
447 .size cpu_arch_name, . - cpu_arch_name
449 .type cpu_elf_name, #object
450 cpu_elf_name:
451 .asciz "v5"
452 .size cpu_elf_name, . - cpu_elf_name
453 .align
455 .type cpu_arm1026_name, #object
456 cpu_arm1026_name:
457 .asciz "ARM1026EJ-S"
458 .size cpu_arm1026_name, . - cpu_arm1026_name
460 .align
462 .section ".proc.info.init", #alloc, #execinstr
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
472 .long PMD_TYPE_SECT | \
473 PMD_BIT4 | \
474 PMD_SECT_AP_WRITE | \
475 PMD_SECT_AP_READ
476 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