2 * linux/arch/arm/mm/proc-arm922.S: MMU functions for ARM922
4 * Copyright (C) 1999,2000 ARM Limited
5 * Copyright (C) 2000 Deep Blue Solutions Ltd.
6 * Copyright (C) 2001 Altera Corporation
7 * hacked for non-paged-MM by Hyok S. Choi, 2003.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 * These are the low level assembler for performing cache and TLB
25 * functions on the arm922.
27 * CONFIG_CPU_ARM922_CPU_IDLE -> nohlt
29 #include <linux/linkage.h>
30 #include <linux/config.h>
31 #include <linux/init.h>
32 #include <asm/assembler.h>
33 #include <asm/pgtable-hwdef.h>
34 #include <asm/pgtable.h>
35 #include <asm/procinfo.h>
37 #include <asm/ptrace.h>
38 #include "proc-macros.S"
41 * The size of one data cache line.
43 #define CACHE_DLINESIZE 32
46 * The number of data cache segments.
48 #define CACHE_DSEGMENTS 4
51 * The number of lines in a cache segment.
53 #define CACHE_DENTRIES 64
56 * This is the size at which it becomes more efficient to
57 * clean the whole cache, rather than using the individual
58 * cache line maintainence instructions. (I think this should
61 #define CACHE_DLIMIT 8192
66 * cpu_arm922_proc_init()
68 ENTRY(cpu_arm922_proc_init)
72 * cpu_arm922_proc_fin()
74 ENTRY(cpu_arm922_proc_fin)
76 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
78 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
79 bl arm922_flush_kern_cache_all
81 bl v4wt_flush_kern_cache_all
83 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
84 bic r0, r0, #0x1000 @ ...i............
85 bic r0, r0, #0x000e @ ............wca.
86 mcr p15, 0, r0, c1, c0, 0 @ disable caches
90 * cpu_arm922_reset(loc)
92 * Perform a soft reset of the system. Put the CPU into the
93 * same state as it would be if it had been reset, and branch
94 * to what would be the reset vector.
96 * loc: location to jump to for soft reset
99 ENTRY(cpu_arm922_reset)
101 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
102 mcr p15, 0, ip, c7, c10, 4 @ drain WB
104 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
106 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
107 bic ip, ip, #0x000f @ ............wcam
108 bic ip, ip, #0x1100 @ ...i...s........
109 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
113 * cpu_arm922_do_idle()
116 ENTRY(cpu_arm922_do_idle)
117 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
121 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
124 * flush_user_cache_all()
126 * Clean and invalidate all cache entries in a particular
129 ENTRY(arm922_flush_user_cache_all)
133 * flush_kern_cache_all()
135 * Clean and invalidate the entire cache.
137 ENTRY(arm922_flush_kern_cache_all)
141 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
142 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
143 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
144 subs r3, r3, #1 << 26
145 bcs 2b @ entries 63 to 0
147 bcs 1b @ segments 7 to 0
149 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
150 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
154 * flush_user_cache_range(start, end, flags)
156 * Clean and invalidate a range of cache entries in the
157 * specified address range.
159 * - start - start address (inclusive)
160 * - end - end address (exclusive)
161 * - flags - vm_flags describing address space
163 ENTRY(arm922_flush_user_cache_range)
165 sub r3, r1, r0 @ calculate total size
166 cmp r3, #CACHE_DLIMIT
167 bhs __flush_whole_cache
169 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
171 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
172 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(arm922_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(arm922_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(arm922_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(arm922_dma_inv_range)
245 tst r0, #CACHE_DLINESIZE - 1
246 bic r0, 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
250 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
251 add r0, r0, #CACHE_DLINESIZE
254 mcr p15, 0, r0, c7, c10, 4 @ drain WB
258 * dma_clean_range(start, end)
260 * Clean the specified virtual address range.
262 * - start - virtual start address
263 * - end - virtual end address
267 ENTRY(arm922_dma_clean_range)
268 bic r0, r0, #CACHE_DLINESIZE - 1
269 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
270 add r0, r0, #CACHE_DLINESIZE
273 mcr p15, 0, r0, c7, c10, 4 @ drain WB
277 * dma_flush_range(start, end)
279 * Clean and invalidate the specified virtual address range.
281 * - start - virtual start address
282 * - end - virtual end address
284 ENTRY(arm922_dma_flush_range)
285 bic r0, r0, #CACHE_DLINESIZE - 1
286 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
287 add r0, r0, #CACHE_DLINESIZE
290 mcr p15, 0, r0, c7, c10, 4 @ drain WB
293 ENTRY(arm922_cache_fns)
294 .long arm922_flush_kern_cache_all
295 .long arm922_flush_user_cache_all
296 .long arm922_flush_user_cache_range
297 .long arm922_coherent_kern_range
298 .long arm922_coherent_user_range
299 .long arm922_flush_kern_dcache_page
300 .long arm922_dma_inv_range
301 .long arm922_dma_clean_range
302 .long arm922_dma_flush_range
307 ENTRY(cpu_arm922_dcache_clean_area)
308 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
309 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
310 add r0, r0, #CACHE_DLINESIZE
311 subs r1, r1, #CACHE_DLINESIZE
316 /* =============================== PageTable ============================== */
319 * cpu_arm922_switch_mm(pgd)
321 * Set the translation base pointer to be as described by pgd.
323 * pgd: new page tables
326 ENTRY(cpu_arm922_switch_mm)
329 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
330 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
332 @ && 'Clean & Invalidate whole DCache'
333 @ && Re-written to use Index Ops.
334 @ && Uses registers r1, r3 and ip
336 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 4 segments
337 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
338 2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
339 subs r3, r3, #1 << 26
340 bcs 2b @ entries 63 to 0
342 bcs 1b @ segments 7 to 0
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_arm922_set_pte(ptep, pte)
354 * Set a PTE and flush it out
357 ENTRY(cpu_arm922_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 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
384 mcr p15, 0, r0, c7, c10, 4 @ drain WB
385 #endif /* CONFIG_MMU */
390 .type __arm922_setup, #function
393 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
394 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
396 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
400 mrc p15, 0, r0, c1, c0 @ get control register v4
404 .size __arm922_setup, . - __arm922_setup
408 * .RVI ZFRS BLDP WCAM
409 * ..11 0001 ..11 0101
412 .type arm922_crval, #object
414 crval clear=0x00003f3f, mmuset=0x00003135, ucset=0x00001130
419 * Purpose : Function pointers used to access above functions - all calls
422 .type arm922_processor_functions, #object
423 arm922_processor_functions:
424 .word v4t_early_abort
425 .word cpu_arm922_proc_init
426 .word cpu_arm922_proc_fin
427 .word cpu_arm922_reset
428 .word cpu_arm922_do_idle
429 .word cpu_arm922_dcache_clean_area
430 .word cpu_arm922_switch_mm
431 .word cpu_arm922_set_pte
432 .size arm922_processor_functions, . - arm922_processor_functions
436 .type cpu_arch_name, #object
439 .size cpu_arch_name, . - cpu_arch_name
441 .type cpu_elf_name, #object
444 .size cpu_elf_name, . - cpu_elf_name
446 .type cpu_arm922_name, #object
449 .size cpu_arm922_name, . - cpu_arm922_name
453 .section ".proc.info.init", #alloc, #execinstr
455 .type __arm922_proc_info,#object
459 .long PMD_TYPE_SECT | \
460 PMD_SECT_BUFFERABLE | \
461 PMD_SECT_CACHEABLE | \
463 PMD_SECT_AP_WRITE | \
468 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
469 .long cpu_arm922_name
470 .long arm922_processor_functions
473 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
474 .long arm922_cache_fns
478 .size __arm922_proc_info, . - __arm922_proc_info