2 * linux/arch/arm/mm/proc-arm926.S: MMU functions for ARM926EJ-S
4 * Copyright (C) 1999-2001 ARM Limited
5 * Copyright (C) 2000 Deep Blue Solutions Ltd.
6 * hacked for non-paged-MM by Hyok S. Choi, 2003.
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.
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.
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
23 * These are the low level assembler for performing cache and TLB
24 * functions on the arm926.
26 * CONFIG_CPU_ARM926_CPU_IDLE -> nohlt
28 #include <linux/linkage.h>
29 #include <linux/init.h>
30 #include <asm/assembler.h>
32 #include <asm/pgtable-hwdef.h>
33 #include <asm/pgtable.h>
35 #include <asm/ptrace.h>
36 #include "proc-macros.S"
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.
43 * This value should be chosen such that we choose the cheapest
46 #define CACHE_DLIMIT 16384
49 * the cache line size of the I and D cache
51 #define CACHE_DLINESIZE 32
55 * cpu_arm926_proc_init()
57 ENTRY(cpu_arm926_proc_init)
61 * cpu_arm926_proc_fin()
63 ENTRY(cpu_arm926_proc_fin)
65 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
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
75 * cpu_arm926_reset(loc)
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.
81 * loc: location to jump to for soft reset
84 ENTRY(cpu_arm926_reset)
86 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
87 mcr p15, 0, ip, c7, c10, 4 @ drain WB
89 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
91 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
92 bic ip, ip, #0x000f @ ............wcam
93 bic ip, ip, #0x1100 @ ...i...s........
94 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
98 * cpu_arm926_do_idle()
100 * Called with IRQs disabled
103 ENTRY(cpu_arm926_do_idle)
105 mrc p15, 0, r1, c1, c0, 0 @ Read control register
106 mcr p15, 0, r0, c7, c10, 4 @ Drain write buffer
108 mrs r3, cpsr @ Disable FIQs while Icache
109 orr ip, r3, #PSR_F_BIT @ is disabled
111 mcr p15, 0, r2, c1, c0, 0 @ Disable I cache
112 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
113 mcr p15, 0, r1, c1, c0, 0 @ Restore ICache enable
114 msr cpsr_c, r3 @ Restore FIQ state
118 * flush_user_cache_all()
120 * Clean and invalidate all cache entries in a particular
123 ENTRY(arm926_flush_user_cache_all)
127 * flush_kern_cache_all()
129 * Clean and invalidate the entire cache.
131 ENTRY(arm926_flush_kern_cache_all)
135 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
136 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
138 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
142 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
143 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
147 * flush_user_cache_range(start, end, flags)
149 * Clean and invalidate a range of cache entries in the
150 * specified address range.
152 * - start - start address (inclusive)
153 * - end - end address (exclusive)
154 * - flags - vm_flags describing address space
156 ENTRY(arm926_flush_user_cache_range)
158 sub r3, r1, r0 @ calculate total size
159 cmp r3, #CACHE_DLIMIT
160 bgt __flush_whole_cache
162 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
163 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
164 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
165 add r0, r0, #CACHE_DLINESIZE
166 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
167 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
168 add r0, r0, #CACHE_DLINESIZE
170 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
171 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
172 add r0, r0, #CACHE_DLINESIZE
173 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
174 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
175 add r0, r0, #CACHE_DLINESIZE
180 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
184 * coherent_kern_range(start, end)
186 * Ensure coherency between the Icache and the Dcache in the
187 * region described by start, end. If you have non-snooping
188 * Harvard caches, you need to implement this function.
190 * - start - virtual start address
191 * - end - virtual end address
193 ENTRY(arm926_coherent_kern_range)
197 * coherent_user_range(start, end)
199 * Ensure coherency between the Icache and the Dcache in the
200 * region described by start, end. If you have non-snooping
201 * Harvard caches, you need to implement this function.
203 * - start - virtual start address
204 * - end - virtual end address
206 ENTRY(arm926_coherent_user_range)
207 bic r0, r0, #CACHE_DLINESIZE - 1
208 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
209 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
210 add r0, r0, #CACHE_DLINESIZE
213 mcr p15, 0, r0, c7, c10, 4 @ drain WB
217 * flush_kern_dcache_page(void *page)
219 * Ensure no D cache aliasing occurs, either with itself or
222 * - addr - page aligned address
224 ENTRY(arm926_flush_kern_dcache_page)
226 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
227 add r0, r0, #CACHE_DLINESIZE
231 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
232 mcr p15, 0, r0, c7, c10, 4 @ drain WB
236 * dma_inv_range(start, end)
238 * Invalidate (discard) the specified virtual address range.
239 * May not write back any entries. If 'start' or 'end'
240 * are not cache line aligned, those lines must be written
243 * - start - virtual start address
244 * - end - virtual end address
248 ENTRY(arm926_dma_inv_range)
249 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
250 tst r0, #CACHE_DLINESIZE - 1
251 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
252 tst r1, #CACHE_DLINESIZE - 1
253 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
255 bic r0, r0, #CACHE_DLINESIZE - 1
256 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
257 add r0, r0, #CACHE_DLINESIZE
260 mcr p15, 0, r0, c7, c10, 4 @ drain WB
264 * dma_clean_range(start, end)
266 * Clean the specified virtual address range.
268 * - start - virtual start address
269 * - end - virtual end address
273 ENTRY(arm926_dma_clean_range)
274 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
275 bic r0, r0, #CACHE_DLINESIZE - 1
276 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
277 add r0, r0, #CACHE_DLINESIZE
281 mcr p15, 0, r0, c7, c10, 4 @ drain WB
285 * dma_flush_range(start, end)
287 * Clean and invalidate the specified virtual address range.
289 * - start - virtual start address
290 * - end - virtual end address
292 ENTRY(arm926_dma_flush_range)
293 bic r0, r0, #CACHE_DLINESIZE - 1
295 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
296 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
298 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
300 add r0, r0, #CACHE_DLINESIZE
303 mcr p15, 0, r0, c7, c10, 4 @ drain WB
306 ENTRY(arm926_cache_fns)
307 .long arm926_flush_kern_cache_all
308 .long arm926_flush_user_cache_all
309 .long arm926_flush_user_cache_range
310 .long arm926_coherent_kern_range
311 .long arm926_coherent_user_range
312 .long arm926_flush_kern_dcache_page
313 .long arm926_dma_inv_range
314 .long arm926_dma_clean_range
315 .long arm926_dma_flush_range
317 ENTRY(cpu_arm926_dcache_clean_area)
318 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
319 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
320 add r0, r0, #CACHE_DLINESIZE
321 subs r1, r1, #CACHE_DLINESIZE
324 mcr p15, 0, r0, c7, c10, 4 @ drain WB
327 /* =============================== PageTable ============================== */
330 * cpu_arm926_switch_mm(pgd)
332 * Set the translation base pointer to be as described by pgd.
334 * pgd: new page tables
337 ENTRY(cpu_arm926_switch_mm)
340 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
341 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
343 @ && 'Clean & Invalidate whole DCache'
344 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
347 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
348 mcr p15, 0, ip, c7, c10, 4 @ drain WB
349 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
350 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
355 * cpu_arm926_set_pte_ext(ptep, pte, ext)
357 * Set a PTE and flush it out
360 ENTRY(cpu_arm926_set_pte_ext)
362 str r1, [r0], #-2048 @ linux version
364 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
366 bic r2, r1, #PTE_SMALL_AP_MASK
367 bic r2, r2, #PTE_TYPE_MASK
368 orr r2, r2, #PTE_TYPE_SMALL
370 tst r1, #L_PTE_USER @ User?
371 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
373 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
374 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
376 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
379 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
380 eor r3, r2, #0x0a @ C & small page?
384 str r2, [r0] @ hardware version
386 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
387 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
389 mcr p15, 0, r0, c7, c10, 4 @ drain WB
395 .type __arm926_setup, #function
398 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
399 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
401 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
405 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
406 mov r0, #4 @ disable write-back on caches explicitly
407 mcr p15, 7, r0, c15, c0, 0
412 mrc p15, 0, r0, c1, c0 @ get control register v4
415 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
416 orr r0, r0, #0x4000 @ .1.. .... .... ....
419 .size __arm926_setup, . - __arm926_setup
423 * .RVI ZFRS BLDP WCAM
424 * .011 0001 ..11 0101
427 .type arm926_crval, #object
429 crval clear=0x00007f3f, mmuset=0x00003135, ucset=0x00001134
434 * Purpose : Function pointers used to access above functions - all calls
437 .type arm926_processor_functions, #object
438 arm926_processor_functions:
439 .word v5tj_early_abort
440 .word cpu_arm926_proc_init
441 .word cpu_arm926_proc_fin
442 .word cpu_arm926_reset
443 .word cpu_arm926_do_idle
444 .word cpu_arm926_dcache_clean_area
445 .word cpu_arm926_switch_mm
446 .word cpu_arm926_set_pte_ext
448 .size arm926_processor_functions, . - arm926_processor_functions
452 .type cpu_arch_name, #object
455 .size cpu_arch_name, . - cpu_arch_name
457 .type cpu_elf_name, #object
460 .size cpu_elf_name, . - cpu_elf_name
462 .type cpu_arm926_name, #object
465 .size cpu_arm926_name, . - cpu_arm926_name
469 .section ".proc.info.init", #alloc, #execinstr
471 .type __arm926_proc_info,#object
473 .long 0x41069260 @ ARM926EJ-S (v5TEJ)
475 .long PMD_TYPE_SECT | \
476 PMD_SECT_BUFFERABLE | \
477 PMD_SECT_CACHEABLE | \
479 PMD_SECT_AP_WRITE | \
481 .long PMD_TYPE_SECT | \
483 PMD_SECT_AP_WRITE | \
488 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA
489 .long cpu_arm926_name
490 .long arm926_processor_functions
493 .long arm926_cache_fns
494 .size __arm926_proc_info, . - __arm926_proc_info