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.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * These are the low level assembler for performing cache and TLB
23 * functions on the arm926.
25 * CONFIG_CPU_ARM926_CPU_IDLE -> nohlt
27 #include <linux/linkage.h>
28 #include <linux/config.h>
29 #include <linux/init.h>
30 #include <asm/assembler.h>
31 #include <asm/pgtable.h>
32 #include <asm/procinfo.h>
33 #include <asm/hardware.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
88 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
89 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
90 bic ip, ip, #0x000f @ ............wcam
91 bic ip, ip, #0x1100 @ ...i...s........
92 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
96 * cpu_arm926_do_idle()
98 * Called with IRQs disabled
101 ENTRY(cpu_arm926_do_idle)
103 mrc p15, 0, r1, c1, c0, 0 @ Read control register
104 mcr p15, 0, r0, c7, c10, 4 @ Drain write buffer
106 mcr p15, 0, r2, c1, c0, 0 @ Disable I cache
107 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
108 mcr p15, 0, r1, c1, c0, 0 @ Restore ICache enable
112 * flush_user_cache_all()
114 * Clean and invalidate all cache entries in a particular
117 ENTRY(arm926_flush_user_cache_all)
121 * flush_kern_cache_all()
123 * Clean and invalidate the entire cache.
125 ENTRY(arm926_flush_kern_cache_all)
129 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
130 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
132 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
136 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
137 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
141 * flush_user_cache_range(start, end, flags)
143 * Clean and invalidate a range of cache entries in the
144 * specified address range.
146 * - start - start address (inclusive)
147 * - end - end address (exclusive)
148 * - flags - vm_flags describing address space
150 ENTRY(arm926_flush_user_cache_range)
152 sub r3, r1, r0 @ calculate total size
153 cmp r3, #CACHE_DLIMIT
154 bgt __flush_whole_cache
156 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
157 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
158 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
159 add r0, r0, #CACHE_DLINESIZE
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
164 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
165 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
166 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
174 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
178 * coherent_kern_range(start, end)
180 * Ensure coherency between the Icache and the Dcache in the
181 * region described by start, end. If you have non-snooping
182 * Harvard caches, you need to implement this function.
184 * - start - virtual start address
185 * - end - virtual end address
187 ENTRY(arm926_coherent_kern_range)
188 bic r0, r0, #CACHE_DLINESIZE - 1
189 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
190 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
191 add r0, r0, #CACHE_DLINESIZE
194 mcr p15, 0, r0, c7, c10, 4 @ drain WB
198 * flush_kern_dcache_page(void *page)
200 * Ensure no D cache aliasing occurs, either with itself or
203 * - addr - page aligned address
205 ENTRY(arm926_flush_kern_dcache_page)
207 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
208 add r0, r0, #CACHE_DLINESIZE
212 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
213 mcr p15, 0, r0, c7, c10, 4 @ drain WB
217 * dma_inv_range(start, end)
219 * Invalidate (discard) the specified virtual address range.
220 * May not write back any entries. If 'start' or 'end'
221 * are not cache line aligned, those lines must be written
224 * - start - virtual start address
225 * - end - virtual end address
229 ENTRY(arm926_dma_inv_range)
230 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
231 tst r0, #CACHE_DLINESIZE - 1
232 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
233 tst r1, #CACHE_DLINESIZE - 1
234 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
236 bic r0, r0, #CACHE_DLINESIZE - 1
237 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
238 add r0, r0, #CACHE_DLINESIZE
241 mcr p15, 0, r0, c7, c10, 4 @ drain WB
245 * dma_clean_range(start, end)
247 * Clean the specified virtual address range.
249 * - start - virtual start address
250 * - end - virtual end address
254 ENTRY(arm926_dma_clean_range)
255 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
256 bic r0, r0, #CACHE_DLINESIZE - 1
257 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
258 add r0, r0, #CACHE_DLINESIZE
262 mcr p15, 0, r0, c7, c10, 4 @ drain WB
266 * dma_flush_range(start, end)
268 * Clean and invalidate the specified virtual address range.
270 * - start - virtual start address
271 * - end - virtual end address
273 ENTRY(arm926_dma_flush_range)
274 bic r0, r0, #CACHE_DLINESIZE - 1
276 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
277 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
279 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
281 add r0, r0, #CACHE_DLINESIZE
284 mcr p15, 0, r0, c7, c10, 4 @ drain WB
287 ENTRY(arm926_cache_fns)
288 .long arm926_flush_kern_cache_all
289 .long arm926_flush_user_cache_all
290 .long arm926_flush_user_cache_range
291 .long arm926_coherent_kern_range
292 .long arm926_flush_kern_dcache_page
293 .long arm926_dma_inv_range
294 .long arm926_dma_clean_range
295 .long arm926_dma_flush_range
297 ENTRY(cpu_arm926_dcache_clean_area)
298 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
299 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
300 add r0, r0, #CACHE_DLINESIZE
301 subs r1, r1, #CACHE_DLINESIZE
304 mcr p15, 0, r0, c7, c10, 4 @ drain WB
307 /* =============================== PageTable ============================== */
310 * cpu_arm926_switch_mm(pgd)
312 * Set the translation base pointer to be as described by pgd.
314 * pgd: new page tables
317 ENTRY(cpu_arm926_switch_mm)
319 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
320 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
322 @ && 'Clean & Invalidate whole DCache'
323 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
326 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
327 mcr p15, 0, ip, c7, c10, 4 @ drain WB
328 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
329 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
333 * cpu_arm926_set_pte(ptep, pte)
335 * Set a PTE and flush it out
338 ENTRY(cpu_arm926_set_pte)
339 str r1, [r0], #-2048 @ linux version
341 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
343 bic r2, r1, #PTE_SMALL_AP_MASK
344 bic r2, r2, #PTE_TYPE_MASK
345 orr r2, r2, #PTE_TYPE_SMALL
347 tst r1, #L_PTE_USER @ User?
348 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
350 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
351 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
353 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
356 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
357 eor r3, r2, #0x0a @ C & small page?
361 str r2, [r0] @ hardware version
363 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
364 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
366 mcr p15, 0, r0, c7, c10, 4 @ drain WB
371 .type __arm926_setup, #function
374 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
375 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
376 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
377 mcr p15, 0, r4, c2, c0 @ load page table pointer
380 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
381 mov r0, #4 @ disable write-back on caches explicitly
382 mcr p15, 7, r0, c15, c0, 0
385 mov r0, #0x1f @ Domains 0, 1 = client
386 mcr p15, 0, r0, c3, c0 @ load domain access register
387 mrc p15, 0, r0, c1, c0 @ get control register v4
389 * Clear out 'unwanted' bits (then put them in if we need them)
395 bic r0, r0, #0x1000 @ ...0 000. .... 000.
397 * Turn on what we want
400 orr r0, r0, #0x2100 @ ..1. ...1 ..11 ...1
402 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
403 orr r0, r0, #0x4000 @ .1.. .... .... ....
405 #ifndef CONFIG_CPU_DCACHE_DISABLE
406 orr r0, r0, #0x0004 @ .... .... .... .1..
408 #ifndef CONFIG_CPU_ICACHE_DISABLE
409 orr r0, r0, #0x1000 @ ...1 .... .... ....
412 .size __arm926_setup, . - __arm926_setup
417 * Purpose : Function pointers used to access above functions - all calls
420 .type arm926_processor_functions, #object
421 arm926_processor_functions:
422 .word v5tj_early_abort
423 .word cpu_arm926_proc_init
424 .word cpu_arm926_proc_fin
425 .word cpu_arm926_reset
426 .word cpu_arm926_do_idle
427 .word cpu_arm926_dcache_clean_area
428 .word cpu_arm926_switch_mm
429 .word cpu_arm926_set_pte
430 .size arm926_processor_functions, . - arm926_processor_functions
434 .type cpu_arch_name, #object
437 .size cpu_arch_name, . - cpu_arch_name
439 .type cpu_elf_name, #object
442 .size cpu_elf_name, . - cpu_elf_name
444 .type cpu_arm926_name, #object
447 #ifndef CONFIG_CPU_ICACHE_DISABLE
450 #ifndef CONFIG_CPU_DCACHE_DISABLE
452 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
457 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
462 .size cpu_arm926_name, . - cpu_arm926_name
466 .section ".proc.info", #alloc, #execinstr
468 .type __arm926_proc_info,#object
470 .long 0x41069260 @ ARM926EJ-S (v5TEJ)
472 .long 0x00000c1e @ mmuflags
476 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_FAST_MULT | HWCAP_JAVA
477 .long cpu_arm926_name
478 .long arm926_processor_functions
481 .long arm926_cache_fns
482 .size __arm926_proc_info, . - __arm926_proc_info