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/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 * The size of one data cache line.
42 #define CACHE_DLINESIZE 32
45 * The number of data cache segments.
47 #define CACHE_DSEGMENTS 4
50 * The number of lines in a cache segment.
52 #define CACHE_DENTRIES 64
55 * This is the size at which it becomes more efficient to
56 * clean the whole cache, rather than using the individual
57 * cache line maintainence instructions. (I think this should
60 #define CACHE_DLIMIT 8192
65 * cpu_arm922_proc_init()
67 ENTRY(cpu_arm922_proc_init)
71 * cpu_arm922_proc_fin()
73 ENTRY(cpu_arm922_proc_fin)
75 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
77 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
78 bl arm922_flush_kern_cache_all
80 bl v4wt_flush_kern_cache_all
82 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
83 bic r0, r0, #0x1000 @ ...i............
84 bic r0, r0, #0x000e @ ............wca.
85 mcr p15, 0, r0, c1, c0, 0 @ disable caches
89 * cpu_arm922_reset(loc)
91 * Perform a soft reset of the system. Put the CPU into the
92 * same state as it would be if it had been reset, and branch
93 * to what would be the reset vector.
95 * loc: location to jump to for soft reset
98 ENTRY(cpu_arm922_reset)
100 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
101 mcr p15, 0, ip, c7, c10, 4 @ drain WB
103 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
105 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
106 bic ip, ip, #0x000f @ ............wcam
107 bic ip, ip, #0x1100 @ ...i...s........
108 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
112 * cpu_arm922_do_idle()
115 ENTRY(cpu_arm922_do_idle)
116 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
120 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
123 * flush_user_cache_all()
125 * Clean and invalidate all cache entries in a particular
128 ENTRY(arm922_flush_user_cache_all)
132 * flush_kern_cache_all()
134 * Clean and invalidate the entire cache.
136 ENTRY(arm922_flush_kern_cache_all)
140 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
141 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
142 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
143 subs r3, r3, #1 << 26
144 bcs 2b @ entries 63 to 0
146 bcs 1b @ segments 7 to 0
148 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
149 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
153 * flush_user_cache_range(start, end, flags)
155 * Clean and invalidate a range of cache entries in the
156 * specified address range.
158 * - start - start address (inclusive)
159 * - end - end address (exclusive)
160 * - flags - vm_flags describing address space
162 ENTRY(arm922_flush_user_cache_range)
164 sub r3, r1, r0 @ calculate total size
165 cmp r3, #CACHE_DLIMIT
166 bhs __flush_whole_cache
168 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
170 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
171 add r0, r0, #CACHE_DLINESIZE
175 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
179 * coherent_kern_range(start, end)
181 * Ensure coherency between the Icache and the Dcache in the
182 * region described by start, end. If you have non-snooping
183 * Harvard caches, you need to implement this function.
185 * - start - virtual start address
186 * - end - virtual end address
188 ENTRY(arm922_coherent_kern_range)
192 * coherent_user_range(start, end)
194 * Ensure coherency between the Icache and the Dcache in the
195 * region described by start, end. If you have non-snooping
196 * Harvard caches, you need to implement this function.
198 * - start - virtual start address
199 * - end - virtual end address
201 ENTRY(arm922_coherent_user_range)
202 bic r0, r0, #CACHE_DLINESIZE - 1
203 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
204 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
205 add r0, r0, #CACHE_DLINESIZE
208 mcr p15, 0, r0, c7, c10, 4 @ drain WB
212 * flush_kern_dcache_page(void *page)
214 * Ensure no D cache aliasing occurs, either with itself or
217 * - addr - page aligned address
219 ENTRY(arm922_flush_kern_dcache_page)
221 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
222 add r0, r0, #CACHE_DLINESIZE
226 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
227 mcr p15, 0, r0, c7, c10, 4 @ drain WB
231 * dma_inv_range(start, end)
233 * Invalidate (discard) the specified virtual address range.
234 * May not write back any entries. If 'start' or 'end'
235 * are not cache line aligned, those lines must be written
238 * - start - virtual start address
239 * - end - virtual end address
243 ENTRY(arm922_dma_inv_range)
244 tst r0, #CACHE_DLINESIZE - 1
245 bic r0, r0, #CACHE_DLINESIZE - 1
246 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
247 tst r1, #CACHE_DLINESIZE - 1
248 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
249 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
250 add r0, r0, #CACHE_DLINESIZE
253 mcr p15, 0, r0, c7, c10, 4 @ drain WB
257 * dma_clean_range(start, end)
259 * Clean the specified virtual address range.
261 * - start - virtual start address
262 * - end - virtual end address
266 ENTRY(arm922_dma_clean_range)
267 bic r0, r0, #CACHE_DLINESIZE - 1
268 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
269 add r0, r0, #CACHE_DLINESIZE
272 mcr p15, 0, r0, c7, c10, 4 @ drain WB
276 * dma_flush_range(start, end)
278 * Clean and invalidate the specified virtual address range.
280 * - start - virtual start address
281 * - end - virtual end address
283 ENTRY(arm922_dma_flush_range)
284 bic r0, r0, #CACHE_DLINESIZE - 1
285 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
286 add r0, r0, #CACHE_DLINESIZE
289 mcr p15, 0, r0, c7, c10, 4 @ drain WB
292 ENTRY(arm922_cache_fns)
293 .long arm922_flush_kern_cache_all
294 .long arm922_flush_user_cache_all
295 .long arm922_flush_user_cache_range
296 .long arm922_coherent_kern_range
297 .long arm922_coherent_user_range
298 .long arm922_flush_kern_dcache_page
299 .long arm922_dma_inv_range
300 .long arm922_dma_clean_range
301 .long arm922_dma_flush_range
306 ENTRY(cpu_arm922_dcache_clean_area)
307 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
308 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
309 add r0, r0, #CACHE_DLINESIZE
310 subs r1, r1, #CACHE_DLINESIZE
315 /* =============================== PageTable ============================== */
318 * cpu_arm922_switch_mm(pgd)
320 * Set the translation base pointer to be as described by pgd.
322 * pgd: new page tables
325 ENTRY(cpu_arm922_switch_mm)
328 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
329 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
331 @ && 'Clean & Invalidate whole DCache'
332 @ && Re-written to use Index Ops.
333 @ && Uses registers r1, r3 and ip
335 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 4 segments
336 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
337 2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
338 subs r3, r3, #1 << 26
339 bcs 2b @ entries 63 to 0
341 bcs 1b @ segments 7 to 0
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_arm922_set_pte(ptep, pte)
353 * Set a PTE and flush it out
356 ENTRY(cpu_arm922_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 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
383 mcr p15, 0, r0, c7, c10, 4 @ drain WB
384 #endif /* CONFIG_MMU */
389 .type __arm922_setup, #function
392 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
393 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
395 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
397 mrc p15, 0, r0, c1, c0 @ get control register v4
398 ldr r5, arm922_cr1_clear
400 ldr r5, arm922_cr1_set
403 .size __arm922_setup, . - __arm922_setup
407 * .RVI ZFRS BLDP WCAM
408 * ..11 0001 ..11 0101
411 .type arm922_cr1_clear, #object
412 .type arm922_cr1_set, #object
421 * Purpose : Function pointers used to access above functions - all calls
424 .type arm922_processor_functions, #object
425 arm922_processor_functions:
426 .word v4t_early_abort
427 .word cpu_arm922_proc_init
428 .word cpu_arm922_proc_fin
429 .word cpu_arm922_reset
430 .word cpu_arm922_do_idle
431 .word cpu_arm922_dcache_clean_area
432 .word cpu_arm922_switch_mm
433 .word cpu_arm922_set_pte
434 .size arm922_processor_functions, . - arm922_processor_functions
438 .type cpu_arch_name, #object
441 .size cpu_arch_name, . - cpu_arch_name
443 .type cpu_elf_name, #object
446 .size cpu_elf_name, . - cpu_elf_name
448 .type cpu_arm922_name, #object
451 #ifndef CONFIG_CPU_ICACHE_DISABLE
454 #ifndef CONFIG_CPU_DCACHE_DISABLE
456 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
463 .size cpu_arm922_name, . - cpu_arm922_name
467 .section ".proc.info.init", #alloc, #execinstr
469 .type __arm922_proc_info,#object
473 .long PMD_TYPE_SECT | \
474 PMD_SECT_BUFFERABLE | \
475 PMD_SECT_CACHEABLE | \
477 PMD_SECT_AP_WRITE | \
482 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
483 .long cpu_arm922_name
484 .long arm922_processor_functions
487 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
488 .long arm922_cache_fns
492 .size __arm922_proc_info, . - __arm922_proc_info