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 mcr p15, 0, r2, c1, c0, 0 @ Disable I cache
109 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
110 mcr p15, 0, r1, c1, c0, 0 @ Restore ICache enable
114 * flush_user_cache_all()
116 * Clean and invalidate all cache entries in a particular
119 ENTRY(arm926_flush_user_cache_all)
123 * flush_kern_cache_all()
125 * Clean and invalidate the entire cache.
127 ENTRY(arm926_flush_kern_cache_all)
131 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
132 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
134 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
138 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
139 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
143 * flush_user_cache_range(start, end, flags)
145 * Clean and invalidate a range of cache entries in the
146 * specified address range.
148 * - start - start address (inclusive)
149 * - end - end address (exclusive)
150 * - flags - vm_flags describing address space
152 ENTRY(arm926_flush_user_cache_range)
154 sub r3, r1, r0 @ calculate total size
155 cmp r3, #CACHE_DLIMIT
156 bgt __flush_whole_cache
158 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
159 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
160 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
161 add r0, r0, #CACHE_DLINESIZE
162 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
163 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
164 add r0, r0, #CACHE_DLINESIZE
166 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
167 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
168 add r0, r0, #CACHE_DLINESIZE
169 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
170 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
171 add r0, r0, #CACHE_DLINESIZE
176 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
180 * coherent_kern_range(start, end)
182 * Ensure coherency between the Icache and the Dcache in the
183 * region described by start, end. If you have non-snooping
184 * Harvard caches, you need to implement this function.
186 * - start - virtual start address
187 * - end - virtual end address
189 ENTRY(arm926_coherent_kern_range)
193 * coherent_user_range(start, end)
195 * Ensure coherency between the Icache and the Dcache in the
196 * region described by start, end. If you have non-snooping
197 * Harvard caches, you need to implement this function.
199 * - start - virtual start address
200 * - end - virtual end address
202 ENTRY(arm926_coherent_user_range)
203 bic r0, r0, #CACHE_DLINESIZE - 1
204 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
205 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
206 add r0, r0, #CACHE_DLINESIZE
209 mcr p15, 0, r0, c7, c10, 4 @ drain WB
213 * flush_kern_dcache_page(void *page)
215 * Ensure no D cache aliasing occurs, either with itself or
218 * - addr - page aligned address
220 ENTRY(arm926_flush_kern_dcache_page)
222 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
223 add r0, r0, #CACHE_DLINESIZE
227 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
228 mcr p15, 0, r0, c7, c10, 4 @ drain WB
232 * dma_inv_range(start, end)
234 * Invalidate (discard) the specified virtual address range.
235 * May not write back any entries. If 'start' or 'end'
236 * are not cache line aligned, those lines must be written
239 * - start - virtual start address
240 * - end - virtual end address
244 ENTRY(arm926_dma_inv_range)
245 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
246 tst r0, #CACHE_DLINESIZE - 1
247 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
248 tst r1, #CACHE_DLINESIZE - 1
249 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
251 bic r0, r0, #CACHE_DLINESIZE - 1
252 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
253 add r0, r0, #CACHE_DLINESIZE
256 mcr p15, 0, r0, c7, c10, 4 @ drain WB
260 * dma_clean_range(start, end)
262 * Clean the specified virtual address range.
264 * - start - virtual start address
265 * - end - virtual end address
269 ENTRY(arm926_dma_clean_range)
270 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
271 bic r0, r0, #CACHE_DLINESIZE - 1
272 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
273 add r0, r0, #CACHE_DLINESIZE
277 mcr p15, 0, r0, c7, c10, 4 @ drain WB
281 * dma_flush_range(start, end)
283 * Clean and invalidate the specified virtual address range.
285 * - start - virtual start address
286 * - end - virtual end address
288 ENTRY(arm926_dma_flush_range)
289 bic r0, r0, #CACHE_DLINESIZE - 1
291 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
292 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
294 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
296 add r0, r0, #CACHE_DLINESIZE
299 mcr p15, 0, r0, c7, c10, 4 @ drain WB
302 ENTRY(arm926_cache_fns)
303 .long arm926_flush_kern_cache_all
304 .long arm926_flush_user_cache_all
305 .long arm926_flush_user_cache_range
306 .long arm926_coherent_kern_range
307 .long arm926_coherent_user_range
308 .long arm926_flush_kern_dcache_page
309 .long arm926_dma_inv_range
310 .long arm926_dma_clean_range
311 .long arm926_dma_flush_range
313 ENTRY(cpu_arm926_dcache_clean_area)
314 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
315 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
316 add r0, r0, #CACHE_DLINESIZE
317 subs r1, r1, #CACHE_DLINESIZE
320 mcr p15, 0, r0, c7, c10, 4 @ drain WB
323 /* =============================== PageTable ============================== */
326 * cpu_arm926_switch_mm(pgd)
328 * Set the translation base pointer to be as described by pgd.
330 * pgd: new page tables
333 ENTRY(cpu_arm926_switch_mm)
336 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
337 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
339 @ && 'Clean & Invalidate whole DCache'
340 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
343 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
344 mcr p15, 0, ip, c7, c10, 4 @ drain WB
345 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
346 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
351 * cpu_arm926_set_pte(ptep, pte)
353 * Set a PTE and flush it out
356 ENTRY(cpu_arm926_set_pte)
358 str r1, [r0], #-2048 @ linux version
360 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
362 bic r2, r1, #PTE_SMALL_AP_MASK
363 bic r2, r2, #PTE_TYPE_MASK
364 orr r2, r2, #PTE_TYPE_SMALL
366 tst r1, #L_PTE_USER @ User?
367 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
369 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
370 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
372 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
375 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
376 eor r3, r2, #0x0a @ C & small page?
380 str r2, [r0] @ hardware version
382 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
383 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
385 mcr p15, 0, r0, c7, c10, 4 @ drain WB
391 .type __arm926_setup, #function
394 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
395 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
397 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
401 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
402 mov r0, #4 @ disable write-back on caches explicitly
403 mcr p15, 7, r0, c15, c0, 0
408 mrc p15, 0, r0, c1, c0 @ get control register v4
411 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
412 orr r0, r0, #0x4000 @ .1.. .... .... ....
415 .size __arm926_setup, . - __arm926_setup
419 * .RVI ZFRS BLDP WCAM
420 * .011 0001 ..11 0101
423 .type arm926_crval, #object
425 crval clear=0x00007f3f, mmuset=0x00003135, ucset=0x00001134
430 * Purpose : Function pointers used to access above functions - all calls
433 .type arm926_processor_functions, #object
434 arm926_processor_functions:
435 .word v5tj_early_abort
436 .word cpu_arm926_proc_init
437 .word cpu_arm926_proc_fin
438 .word cpu_arm926_reset
439 .word cpu_arm926_do_idle
440 .word cpu_arm926_dcache_clean_area
441 .word cpu_arm926_switch_mm
442 .word cpu_arm926_set_pte
443 .size arm926_processor_functions, . - arm926_processor_functions
447 .type cpu_arch_name, #object
450 .size cpu_arch_name, . - cpu_arch_name
452 .type cpu_elf_name, #object
455 .size cpu_elf_name, . - cpu_elf_name
457 .type cpu_arm926_name, #object
460 .size cpu_arm926_name, . - cpu_arm926_name
464 .section ".proc.info.init", #alloc, #execinstr
466 .type __arm926_proc_info,#object
468 .long 0x41069260 @ ARM926EJ-S (v5TEJ)
470 .long PMD_TYPE_SECT | \
471 PMD_SECT_BUFFERABLE | \
472 PMD_SECT_CACHEABLE | \
474 PMD_SECT_AP_WRITE | \
476 .long PMD_TYPE_SECT | \
478 PMD_SECT_AP_WRITE | \
483 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_VFP|HWCAP_EDSP|HWCAP_JAVA
484 .long cpu_arm926_name
485 .long arm926_processor_functions
488 .long arm926_cache_fns
489 .size __arm926_proc_info, . - __arm926_proc_info