| blob | 1cc206ab5eae6a76378b79537d3fd7912805a01d |
1 /*
2 * linux/arch/arm/mm/proc-arm1020e.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 arm1020e.
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/elf.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_arm1020e_proc_init()
74 */
75 ENTRY(cpu_arm1020e_proc_init)
76 mov pc, lr
78 /*
79 * cpu_arm1020e_proc_fin()
80 */
81 ENTRY(cpu_arm1020e_proc_fin)
82 stmfd sp!, {lr}
83 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
84 msr cpsr_c, ip
85 bl arm1020e_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_arm1020e_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_arm1020e_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_arm1020e_do_idle()
117 */
118 .align 5
119 ENTRY(cpu_arm1020e_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(arm1020e_flush_user_cache_all)
133 /* FALLTHROUGH */
134 /*
135 * flush_kern_cache_all()
136 *
137 * Clean and invalidate the entire cache.
138 */
139 ENTRY(arm1020e_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 subs r3, r3, #1 << 26
149 bcs 2b @ entries 63 to 0
150 subs r1, r1, #1 << 5
151 bcs 1b @ segments 15 to 0
152 #endif
153 tst r2, #VM_EXEC
154 #ifndef CONFIG_CPU_ICACHE_DISABLE
155 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
156 #endif
157 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
158 mov pc, lr
160 /*
161 * flush_user_cache_range(start, end, flags)
162 *
163 * Invalidate a range of cache entries in the specified
164 * address space.
165 *
166 * - start - start address (inclusive)
167 * - end - end address (exclusive)
168 * - flags - vm_flags for this space
169 */
170 ENTRY(arm1020e_flush_user_cache_range)
171 mov ip, #0
172 sub r3, r1, r0 @ calculate total size
173 cmp r3, #CACHE_DLIMIT
174 bhs __flush_whole_cache
176 #ifndef CONFIG_CPU_DCACHE_DISABLE
177 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
178 add r0, r0, #CACHE_DLINESIZE
179 cmp r0, r1
180 blo 1b
181 #endif
182 tst r2, #VM_EXEC
183 #ifndef CONFIG_CPU_ICACHE_DISABLE
184 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
185 #endif
186 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
187 mov pc, lr
189 /*
190 * coherent_kern_range(start, end)
191 *
192 * Ensure coherency between the Icache and the Dcache in the
193 * region described by start. 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 */
199 ENTRY(arm1020e_coherent_kern_range)
200 /* FALLTHROUGH */
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(arm1020e_coherent_user_range)
212 mov ip, #0
213 bic r0, r0, #CACHE_DLINESIZE - 1
214 1:
215 #ifndef CONFIG_CPU_DCACHE_DISABLE
216 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
217 #endif
218 #ifndef CONFIG_CPU_ICACHE_DISABLE
219 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
220 #endif
221 add r0, r0, #CACHE_DLINESIZE
222 cmp r0, r1
223 blo 1b
224 mcr p15, 0, ip, c7, c10, 4 @ drain WB
225 mov pc, lr
227 /*
228 * flush_kern_dcache_page(void *page)
229 *
230 * Ensure no D cache aliasing occurs, either with itself or
231 * the I cache
232 *
233 * - page - page aligned address
234 */
235 ENTRY(arm1020e_flush_kern_dcache_page)
236 mov ip, #0
237 #ifndef CONFIG_CPU_DCACHE_DISABLE
238 add r1, r0, #PAGE_SZ
239 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
240 add r0, r0, #CACHE_DLINESIZE
241 cmp r0, r1
242 blo 1b
243 #endif
244 mcr p15, 0, ip, c7, c10, 4 @ drain WB
245 mov pc, lr
247 /*
248 * dma_inv_range(start, end)
249 *
250 * Invalidate (discard) the specified virtual address range.
251 * May not write back any entries. If 'start' or 'end'
252 * are not cache line aligned, those lines must be written
253 * back.
254 *
255 * - start - virtual start address
256 * - end - virtual end address
257 *
258 * (same as v4wb)
259 */
260 ENTRY(arm1020e_dma_inv_range)
261 mov ip, #0
262 #ifndef CONFIG_CPU_DCACHE_DISABLE
263 tst r0, #CACHE_DLINESIZE - 1
264 bic r0, r0, #CACHE_DLINESIZE - 1
265 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
266 tst r1, #CACHE_DLINESIZE - 1
267 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
268 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
269 add r0, r0, #CACHE_DLINESIZE
270 cmp r0, r1
271 blo 1b
272 #endif
273 mcr p15, 0, ip, c7, c10, 4 @ drain WB
274 mov pc, lr
276 /*
277 * dma_clean_range(start, end)
278 *
279 * Clean the specified virtual address range.
280 *
281 * - start - virtual start address
282 * - end - virtual end address
283 *
284 * (same as v4wb)
285 */
286 ENTRY(arm1020e_dma_clean_range)
287 mov ip, #0
288 #ifndef CONFIG_CPU_DCACHE_DISABLE
289 bic r0, r0, #CACHE_DLINESIZE - 1
290 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
291 add r0, r0, #CACHE_DLINESIZE
292 cmp r0, r1
293 blo 1b
294 #endif
295 mcr p15, 0, ip, c7, c10, 4 @ drain WB
296 mov pc, lr
298 /*
299 * dma_flush_range(start, end)
300 *
301 * Clean and invalidate the specified virtual address range.
302 *
303 * - start - virtual start address
304 * - end - virtual end address
305 */
306 ENTRY(arm1020e_dma_flush_range)
307 mov ip, #0
308 #ifndef CONFIG_CPU_DCACHE_DISABLE
309 bic r0, r0, #CACHE_DLINESIZE - 1
310 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
311 add r0, r0, #CACHE_DLINESIZE
312 cmp r0, r1
313 blo 1b
314 #endif
315 mcr p15, 0, ip, c7, c10, 4 @ drain WB
316 mov pc, lr
318 ENTRY(arm1020e_cache_fns)
319 .long arm1020e_flush_kern_cache_all
320 .long arm1020e_flush_user_cache_all
321 .long arm1020e_flush_user_cache_range
322 .long arm1020e_coherent_kern_range
323 .long arm1020e_coherent_user_range
324 .long arm1020e_flush_kern_dcache_page
325 .long arm1020e_dma_inv_range
326 .long arm1020e_dma_clean_range
327 .long arm1020e_dma_flush_range
329 .align 5
330 ENTRY(cpu_arm1020e_dcache_clean_area)
331 #ifndef CONFIG_CPU_DCACHE_DISABLE
332 mov ip, #0
333 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
334 add r0, r0, #CACHE_DLINESIZE
335 subs r1, r1, #CACHE_DLINESIZE
336 bhi 1b
337 #endif
338 mov pc, lr
340 /* =============================== PageTable ============================== */
342 /*
343 * cpu_arm1020e_switch_mm(pgd)
344 *
345 * Set the translation base pointer to be as described by pgd.
346 *
347 * pgd: new page tables
348 */
349 .align 5
350 ENTRY(cpu_arm1020e_switch_mm)
351 #ifdef CONFIG_MMU
352 #ifndef CONFIG_CPU_DCACHE_DISABLE
353 mcr p15, 0, r3, c7, c10, 4
354 mov r1, #0xF @ 16 segments
355 1: mov r3, #0x3F @ 64 entries
356 2: mov ip, r3, LSL #26 @ shift up entry
357 orr ip, ip, r1, LSL #5 @ shift in/up index
358 mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
359 mov ip, #0
360 subs r3, r3, #1
361 cmp r3, #0
362 bge 2b @ entries 3F to 0
363 subs r1, r1, #1
364 cmp r1, #0
365 bge 1b @ segments 15 to 0
367 #endif
368 mov r1, #0
369 #ifndef CONFIG_CPU_ICACHE_DISABLE
370 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
371 #endif
372 mcr p15, 0, r1, c7, c10, 4 @ drain WB
373 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
374 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
375 #endif
376 mov pc, lr
378 /*
379 * cpu_arm1020e_set_pte(ptep, pte)
380 *
381 * Set a PTE and flush it out
382 */
383 .align 5
384 ENTRY(cpu_arm1020e_set_pte_ext)
385 #ifdef CONFIG_MMU
386 str r1, [r0], #-2048 @ linux version
388 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
390 bic r2, r1, #PTE_SMALL_AP_MASK
391 bic r2, r2, #PTE_TYPE_MASK
392 orr r2, r2, #PTE_TYPE_SMALL
394 tst r1, #L_PTE_USER @ User?
395 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
397 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
398 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
400 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
401 movne r2, #0
403 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
404 eor r3, r1, #0x0a @ C & small page?
405 tst r3, #0x0b
406 biceq r2, r2, #4
407 #endif
408 str r2, [r0] @ hardware version
409 mov r0, r0
410 #ifndef CONFIG_CPU_DCACHE_DISABLE
411 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
412 #endif
413 #endif /* CONFIG_MMU */
414 mov pc, lr
416 __INIT
418 .type __arm1020e_setup, #function
419 __arm1020e_setup:
420 mov r0, #0
421 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
422 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
423 #ifdef CONFIG_MMU
424 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
425 #endif
426 adr r5, arm1020e_crval
427 ldmia r5, {r5, r6}
428 mrc p15, 0, r0, c1, c0 @ get control register v4
429 bic r0, r0, r5
430 orr r0, r0, r6
431 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
432 orr r0, r0, #0x4000 @ .R.. .... .... ....
433 #endif
434 mov pc, lr
435 .size __arm1020e_setup, . - __arm1020e_setup
437 /*
438 * R
439 * .RVI ZFRS BLDP WCAM
440 * .011 1001 ..11 0101
441 */
442 .type arm1020e_crval, #object
443 arm1020e_crval:
444 crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001930
446 __INITDATA
448 /*
449 * Purpose : Function pointers used to access above functions - all calls
450 * come through these
451 */
452 .type arm1020e_processor_functions, #object
453 arm1020e_processor_functions:
454 .word v4t_early_abort
455 .word cpu_arm1020e_proc_init
456 .word cpu_arm1020e_proc_fin
457 .word cpu_arm1020e_reset
458 .word cpu_arm1020e_do_idle
459 .word cpu_arm1020e_dcache_clean_area
460 .word cpu_arm1020e_switch_mm
461 .word cpu_arm1020e_set_pte_ext
462 .size arm1020e_processor_functions, . - arm1020e_processor_functions
464 .section ".rodata"
466 .type cpu_arch_name, #object
467 cpu_arch_name:
468 .asciz "armv5te"
469 .size cpu_arch_name, . - cpu_arch_name
471 .type cpu_elf_name, #object
472 cpu_elf_name:
473 .asciz "v5"
474 .size cpu_elf_name, . - cpu_elf_name
476 .type cpu_arm1020e_name, #object
477 cpu_arm1020e_name:
478 .asciz "ARM1020E"
479 .size cpu_arm1020e_name, . - cpu_arm1020e_name
481 .align
483 .section ".proc.info.init", #alloc, #execinstr
485 .type __arm1020e_proc_info,#object
486 __arm1020e_proc_info:
487 .long 0x4105a200 @ ARM 1020TE (Architecture v5TE)
488 .long 0xff0ffff0
489 .long PMD_TYPE_SECT | \
490 PMD_BIT4 | \
491 PMD_SECT_AP_WRITE | \
492 PMD_SECT_AP_READ
493 .long PMD_TYPE_SECT | \
494 PMD_BIT4 | \
495 PMD_SECT_AP_WRITE | \
496 PMD_SECT_AP_READ
497 b __arm1020e_setup
498 .long cpu_arch_name
499 .long cpu_elf_name
500 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_EDSP
501 .long cpu_arm1020e_name
502 .long arm1020e_processor_functions
503 .long v4wbi_tlb_fns
504 .long v4wb_user_fns
505 .long arm1020e_cache_fns
506 .size __arm1020e_proc_info, . - __arm1020e_proc_info