2 * linux/arch/arm/mm/proc-arm920.S: MMU functions for ARM920
4 * Copyright (C) 1999,2000 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 arm920.
26 * CONFIG_CPU_ARM920_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 * The size of one data cache line.
41 #define CACHE_DLINESIZE 32
44 * The number of data cache segments.
46 #define CACHE_DSEGMENTS 8
49 * The number of lines in a cache segment.
51 #define CACHE_DENTRIES 64
54 * This is the size at which it becomes more efficient to
55 * clean the whole cache, rather than using the individual
56 * cache line maintainence instructions.
58 #define CACHE_DLIMIT 65536
63 * cpu_arm920_proc_init()
65 ENTRY(cpu_arm920_proc_init)
69 * cpu_arm920_proc_fin()
71 ENTRY(cpu_arm920_proc_fin)
73 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
75 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
76 bl arm920_flush_kern_cache_all
78 bl v4wt_flush_kern_cache_all
80 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
81 bic r0, r0, #0x1000 @ ...i............
82 bic r0, r0, #0x000e @ ............wca.
83 mcr p15, 0, r0, c1, c0, 0 @ disable caches
87 * cpu_arm920_reset(loc)
89 * Perform a soft reset of the system. Put the CPU into the
90 * same state as it would be if it had been reset, and branch
91 * to what would be the reset vector.
93 * loc: location to jump to for soft reset
96 ENTRY(cpu_arm920_reset)
98 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
99 mcr p15, 0, ip, c7, c10, 4 @ drain WB
101 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
103 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
104 bic ip, ip, #0x000f @ ............wcam
105 bic ip, ip, #0x1100 @ ...i...s........
106 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
110 * cpu_arm920_do_idle()
113 ENTRY(cpu_arm920_do_idle)
114 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
118 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
121 * flush_user_cache_all()
123 * Invalidate all cache entries in a particular address
126 ENTRY(arm920_flush_user_cache_all)
130 * flush_kern_cache_all()
132 * Clean and invalidate the entire cache.
134 ENTRY(arm920_flush_kern_cache_all)
138 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
139 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
140 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
141 subs r3, r3, #1 << 26
142 bcs 2b @ entries 63 to 0
144 bcs 1b @ segments 7 to 0
146 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
147 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
151 * flush_user_cache_range(start, end, flags)
153 * Invalidate a range of cache entries in the specified
156 * - start - start address (inclusive)
157 * - end - end address (exclusive)
158 * - flags - vm_flags for address space
160 ENTRY(arm920_flush_user_cache_range)
162 sub r3, r1, r0 @ calculate total size
163 cmp r3, #CACHE_DLIMIT
164 bhs __flush_whole_cache
166 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
168 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
169 add r0, r0, #CACHE_DLINESIZE
173 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
177 * coherent_kern_range(start, end)
179 * Ensure coherency between the Icache and the Dcache in the
180 * region described by start, end. If you have non-snooping
181 * Harvard caches, you need to implement this function.
183 * - start - virtual start address
184 * - end - virtual end address
186 ENTRY(arm920_coherent_kern_range)
190 * coherent_user_range(start, end)
192 * Ensure coherency between the Icache and the Dcache in the
193 * region described by start, end. If you have non-snooping
194 * Harvard caches, you need to implement this function.
196 * - start - virtual start address
197 * - end - virtual end address
199 ENTRY(arm920_coherent_user_range)
200 bic r0, r0, #CACHE_DLINESIZE - 1
201 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
202 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
203 add r0, r0, #CACHE_DLINESIZE
206 mcr p15, 0, r0, c7, c10, 4 @ drain WB
210 * flush_kern_dcache_page(void *page)
212 * Ensure no D cache aliasing occurs, either with itself or
215 * - addr - page aligned address
217 ENTRY(arm920_flush_kern_dcache_page)
219 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
220 add r0, r0, #CACHE_DLINESIZE
224 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
225 mcr p15, 0, r0, c7, c10, 4 @ drain WB
229 * dma_inv_range(start, end)
231 * Invalidate (discard) the specified virtual address range.
232 * May not write back any entries. If 'start' or 'end'
233 * are not cache line aligned, those lines must be written
236 * - start - virtual start address
237 * - end - virtual end address
241 ENTRY(arm920_dma_inv_range)
242 tst r0, #CACHE_DLINESIZE - 1
243 bic r0, r0, #CACHE_DLINESIZE - 1
244 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
245 tst r1, #CACHE_DLINESIZE - 1
246 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
247 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
248 add r0, r0, #CACHE_DLINESIZE
251 mcr p15, 0, r0, c7, c10, 4 @ drain WB
255 * dma_clean_range(start, end)
257 * Clean the specified virtual address range.
259 * - start - virtual start address
260 * - end - virtual end address
264 ENTRY(arm920_dma_clean_range)
265 bic r0, r0, #CACHE_DLINESIZE - 1
266 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
267 add r0, r0, #CACHE_DLINESIZE
270 mcr p15, 0, r0, c7, c10, 4 @ drain WB
274 * dma_flush_range(start, end)
276 * Clean and invalidate the specified virtual address range.
278 * - start - virtual start address
279 * - end - virtual end address
281 ENTRY(arm920_dma_flush_range)
282 bic r0, r0, #CACHE_DLINESIZE - 1
283 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
284 add r0, r0, #CACHE_DLINESIZE
287 mcr p15, 0, r0, c7, c10, 4 @ drain WB
290 ENTRY(arm920_cache_fns)
291 .long arm920_flush_kern_cache_all
292 .long arm920_flush_user_cache_all
293 .long arm920_flush_user_cache_range
294 .long arm920_coherent_kern_range
295 .long arm920_coherent_user_range
296 .long arm920_flush_kern_dcache_page
297 .long arm920_dma_inv_range
298 .long arm920_dma_clean_range
299 .long arm920_dma_flush_range
304 ENTRY(cpu_arm920_dcache_clean_area)
305 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
306 add r0, r0, #CACHE_DLINESIZE
307 subs r1, r1, #CACHE_DLINESIZE
311 /* =============================== PageTable ============================== */
314 * cpu_arm920_switch_mm(pgd)
316 * Set the translation base pointer to be as described by pgd.
318 * pgd: new page tables
321 ENTRY(cpu_arm920_switch_mm)
324 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
325 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
327 @ && 'Clean & Invalidate whole DCache'
328 @ && Re-written to use Index Ops.
329 @ && Uses registers r1, r3 and ip
331 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
332 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
333 2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
334 subs r3, r3, #1 << 26
335 bcs 2b @ entries 63 to 0
337 bcs 1b @ segments 7 to 0
339 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
340 mcr p15, 0, ip, c7, c10, 4 @ drain WB
341 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
342 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
347 * cpu_arm920_set_pte(ptep, pte, ext)
349 * Set a PTE and flush it out
352 ENTRY(cpu_arm920_set_pte_ext)
354 str r1, [r0], #-2048 @ linux version
356 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
358 bic r2, r1, #PTE_SMALL_AP_MASK
359 bic r2, r2, #PTE_TYPE_MASK
360 orr r2, r2, #PTE_TYPE_SMALL
362 tst r1, #L_PTE_USER @ User?
363 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
365 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
366 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
368 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
371 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
372 eor r3, r2, #0x0a @ C & small page?
376 str r2, [r0] @ hardware version
378 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
379 mcr p15, 0, r0, c7, c10, 4 @ drain WB
380 #endif /* CONFIG_MMU */
385 .type __arm920_setup, #function
388 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
389 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
391 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
395 mrc p15, 0, r0, c1, c0 @ get control register v4
399 .size __arm920_setup, . - __arm920_setup
403 * .RVI ZFRS BLDP WCAM
404 * ..11 0001 ..11 0101
407 .type arm920_crval, #object
409 crval clear=0x00003f3f, mmuset=0x00003135, ucset=0x00001130
414 * Purpose : Function pointers used to access above functions - all calls
417 .type arm920_processor_functions, #object
418 arm920_processor_functions:
419 .word v4t_early_abort
421 .word cpu_arm920_proc_init
422 .word cpu_arm920_proc_fin
423 .word cpu_arm920_reset
424 .word cpu_arm920_do_idle
425 .word cpu_arm920_dcache_clean_area
426 .word cpu_arm920_switch_mm
427 .word cpu_arm920_set_pte_ext
428 .size arm920_processor_functions, . - arm920_processor_functions
432 .type cpu_arch_name, #object
435 .size cpu_arch_name, . - cpu_arch_name
437 .type cpu_elf_name, #object
440 .size cpu_elf_name, . - cpu_elf_name
442 .type cpu_arm920_name, #object
445 .size cpu_arm920_name, . - cpu_arm920_name
449 .section ".proc.info.init", #alloc, #execinstr
451 .type __arm920_proc_info,#object
455 .long PMD_TYPE_SECT | \
456 PMD_SECT_BUFFERABLE | \
457 PMD_SECT_CACHEABLE | \
459 PMD_SECT_AP_WRITE | \
461 .long PMD_TYPE_SECT | \
463 PMD_SECT_AP_WRITE | \
468 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
469 .long cpu_arm920_name
470 .long arm920_processor_functions
473 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
474 .long arm920_cache_fns
478 .size __arm920_proc_info, . - __arm920_proc_info