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/config.h>
30 #include <linux/init.h>
31 #include <asm/assembler.h>
32 #include <asm/pgtable-hwdef.h>
33 #include <asm/pgtable.h>
34 #include <asm/procinfo.h>
36 #include <asm/ptrace.h>
37 #include "proc-macros.S"
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.
44 * This value should be chosen such that we choose the cheapest
47 #define CACHE_DLIMIT 16384
50 * the cache line size of the I and D cache
52 #define CACHE_DLINESIZE 32
56 * cpu_arm926_proc_init()
58 ENTRY(cpu_arm926_proc_init)
62 * cpu_arm926_proc_fin()
64 ENTRY(cpu_arm926_proc_fin)
66 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
68 bl arm926_flush_kern_cache_all
69 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
70 bic r0, r0, #0x1000 @ ...i............
71 bic r0, r0, #0x000e @ ............wca.
72 mcr p15, 0, r0, c1, c0, 0 @ disable caches
76 * cpu_arm926_reset(loc)
78 * Perform a soft reset of the system. Put the CPU into the
79 * same state as it would be if it had been reset, and branch
80 * to what would be the reset vector.
82 * loc: location to jump to for soft reset
85 ENTRY(cpu_arm926_reset)
87 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
88 mcr p15, 0, ip, c7, c10, 4 @ drain WB
90 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
92 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
93 bic ip, ip, #0x000f @ ............wcam
94 bic ip, ip, #0x1100 @ ...i...s........
95 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
99 * cpu_arm926_do_idle()
101 * Called with IRQs disabled
104 ENTRY(cpu_arm926_do_idle)
106 mrc p15, 0, r1, c1, c0, 0 @ Read control register
107 mcr p15, 0, r0, c7, c10, 4 @ Drain write buffer
109 mcr p15, 0, r2, c1, c0, 0 @ Disable I cache
110 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
111 mcr p15, 0, r1, c1, c0, 0 @ Restore ICache enable
115 * flush_user_cache_all()
117 * Clean and invalidate all cache entries in a particular
120 ENTRY(arm926_flush_user_cache_all)
124 * flush_kern_cache_all()
126 * Clean and invalidate the entire cache.
128 ENTRY(arm926_flush_kern_cache_all)
132 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
133 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
135 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
139 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
140 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
144 * flush_user_cache_range(start, end, flags)
146 * Clean and invalidate a range of cache entries in the
147 * specified address range.
149 * - start - start address (inclusive)
150 * - end - end address (exclusive)
151 * - flags - vm_flags describing address space
153 ENTRY(arm926_flush_user_cache_range)
155 sub r3, r1, r0 @ calculate total size
156 cmp r3, #CACHE_DLIMIT
157 bgt __flush_whole_cache
159 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
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 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
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 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
177 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
181 * coherent_kern_range(start, end)
183 * Ensure coherency between the Icache and the Dcache in the
184 * region described by start, end. If you have non-snooping
185 * Harvard caches, you need to implement this function.
187 * - start - virtual start address
188 * - end - virtual end address
190 ENTRY(arm926_coherent_kern_range)
194 * coherent_user_range(start, end)
196 * Ensure coherency between the Icache and the Dcache in the
197 * region described by start, end. If you have non-snooping
198 * Harvard caches, you need to implement this function.
200 * - start - virtual start address
201 * - end - virtual end address
203 ENTRY(arm926_coherent_user_range)
204 bic r0, r0, #CACHE_DLINESIZE - 1
205 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
206 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
207 add r0, r0, #CACHE_DLINESIZE
210 mcr p15, 0, r0, c7, c10, 4 @ drain WB
214 * flush_kern_dcache_page(void *page)
216 * Ensure no D cache aliasing occurs, either with itself or
219 * - addr - page aligned address
221 ENTRY(arm926_flush_kern_dcache_page)
223 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
224 add r0, r0, #CACHE_DLINESIZE
228 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
229 mcr p15, 0, r0, c7, c10, 4 @ drain WB
233 * dma_inv_range(start, end)
235 * Invalidate (discard) the specified virtual address range.
236 * May not write back any entries. If 'start' or 'end'
237 * are not cache line aligned, those lines must be written
240 * - start - virtual start address
241 * - end - virtual end address
245 ENTRY(arm926_dma_inv_range)
246 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
247 tst 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
252 bic r0, r0, #CACHE_DLINESIZE - 1
253 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
254 add r0, r0, #CACHE_DLINESIZE
257 mcr p15, 0, r0, c7, c10, 4 @ drain WB
261 * dma_clean_range(start, end)
263 * Clean the specified virtual address range.
265 * - start - virtual start address
266 * - end - virtual end address
270 ENTRY(arm926_dma_clean_range)
271 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
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
278 mcr p15, 0, r0, c7, c10, 4 @ drain WB
282 * dma_flush_range(start, end)
284 * Clean and invalidate the specified virtual address range.
286 * - start - virtual start address
287 * - end - virtual end address
289 ENTRY(arm926_dma_flush_range)
290 bic r0, r0, #CACHE_DLINESIZE - 1
292 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
293 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
295 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
297 add r0, r0, #CACHE_DLINESIZE
300 mcr p15, 0, r0, c7, c10, 4 @ drain WB
303 ENTRY(arm926_cache_fns)
304 .long arm926_flush_kern_cache_all
305 .long arm926_flush_user_cache_all
306 .long arm926_flush_user_cache_range
307 .long arm926_coherent_kern_range
308 .long arm926_coherent_user_range
309 .long arm926_flush_kern_dcache_page
310 .long arm926_dma_inv_range
311 .long arm926_dma_clean_range
312 .long arm926_dma_flush_range
314 ENTRY(cpu_arm926_dcache_clean_area)
315 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
316 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
317 add r0, r0, #CACHE_DLINESIZE
318 subs r1, r1, #CACHE_DLINESIZE
321 mcr p15, 0, r0, c7, c10, 4 @ drain WB
324 /* =============================== PageTable ============================== */
327 * cpu_arm926_switch_mm(pgd)
329 * Set the translation base pointer to be as described by pgd.
331 * pgd: new page tables
334 ENTRY(cpu_arm926_switch_mm)
337 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
338 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
340 @ && 'Clean & Invalidate whole DCache'
341 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
344 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
345 mcr p15, 0, ip, c7, c10, 4 @ drain WB
346 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
347 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
352 * cpu_arm926_set_pte(ptep, pte)
354 * Set a PTE and flush it out
357 ENTRY(cpu_arm926_set_pte)
359 str r1, [r0], #-2048 @ linux version
361 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
363 bic r2, r1, #PTE_SMALL_AP_MASK
364 bic r2, r2, #PTE_TYPE_MASK
365 orr r2, r2, #PTE_TYPE_SMALL
367 tst r1, #L_PTE_USER @ User?
368 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
370 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
371 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
373 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
376 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
377 eor r3, r2, #0x0a @ C & small page?
381 str r2, [r0] @ hardware version
383 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
384 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
386 mcr p15, 0, r0, c7, c10, 4 @ drain WB
392 .type __arm926_setup, #function
395 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
396 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
398 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
402 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
403 mov r0, #4 @ disable write-back on caches explicitly
404 mcr p15, 7, r0, c15, c0, 0
407 mrc p15, 0, r0, c1, c0 @ get control register v4
408 ldr r5, arm926_cr1_clear
410 ldr r5, arm926_cr1_set
412 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
413 orr r0, r0, #0x4000 @ .1.. .... .... ....
416 .size __arm926_setup, . - __arm926_setup
420 * .RVI ZFRS BLDP WCAM
421 * .011 0001 ..11 0101
424 .type arm926_cr1_clear, #object
425 .type arm926_cr1_set, #object
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
447 .size arm926_processor_functions, . - arm926_processor_functions
451 .type cpu_arch_name, #object
454 .size cpu_arch_name, . - cpu_arch_name
456 .type cpu_elf_name, #object
459 .size cpu_elf_name, . - cpu_elf_name
461 .type cpu_arm926_name, #object
464 .size cpu_arm926_name, . - cpu_arm926_name
468 .section ".proc.info.init", #alloc, #execinstr
470 .type __arm926_proc_info,#object
472 .long 0x41069260 @ ARM926EJ-S (v5TEJ)
474 .long PMD_TYPE_SECT | \
475 PMD_SECT_BUFFERABLE | \
476 PMD_SECT_CACHEABLE | \
478 PMD_SECT_AP_WRITE | \
480 .long PMD_TYPE_SECT | \
482 PMD_SECT_AP_WRITE | \
487 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA
488 .long cpu_arm926_name
489 .long arm926_processor_functions
492 .long arm926_cache_fns
493 .size __arm926_proc_info, . - __arm926_proc_info