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/config.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 8
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.
59 #define CACHE_DLIMIT 65536
64 * cpu_arm920_proc_init()
66 ENTRY(cpu_arm920_proc_init)
70 * cpu_arm920_proc_fin()
72 ENTRY(cpu_arm920_proc_fin)
74 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
76 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
77 bl arm920_flush_kern_cache_all
79 bl v4wt_flush_kern_cache_all
81 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
82 bic r0, r0, #0x1000 @ ...i............
83 bic r0, r0, #0x000e @ ............wca.
84 mcr p15, 0, r0, c1, c0, 0 @ disable caches
88 * cpu_arm920_reset(loc)
90 * Perform a soft reset of the system. Put the CPU into the
91 * same state as it would be if it had been reset, and branch
92 * to what would be the reset vector.
94 * loc: location to jump to for soft reset
97 ENTRY(cpu_arm920_reset)
99 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
100 mcr p15, 0, ip, c7, c10, 4 @ drain WB
102 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
104 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
105 bic ip, ip, #0x000f @ ............wcam
106 bic ip, ip, #0x1100 @ ...i...s........
107 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
111 * cpu_arm920_do_idle()
114 ENTRY(cpu_arm920_do_idle)
115 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
119 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
122 * flush_user_cache_all()
124 * Invalidate all cache entries in a particular address
127 ENTRY(arm920_flush_user_cache_all)
131 * flush_kern_cache_all()
133 * Clean and invalidate the entire cache.
135 ENTRY(arm920_flush_kern_cache_all)
139 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
140 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
141 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
142 subs r3, r3, #1 << 26
143 bcs 2b @ entries 63 to 0
145 bcs 1b @ segments 7 to 0
147 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
148 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
152 * flush_user_cache_range(start, end, flags)
154 * Invalidate a range of cache entries in the specified
157 * - start - start address (inclusive)
158 * - end - end address (exclusive)
159 * - flags - vm_flags for address space
161 ENTRY(arm920_flush_user_cache_range)
163 sub r3, r1, r0 @ calculate total size
164 cmp r3, #CACHE_DLIMIT
165 bhs __flush_whole_cache
167 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
169 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
170 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(arm920_coherent_kern_range)
191 * coherent_user_range(start, end)
193 * Ensure coherency between the Icache and the Dcache in the
194 * region described by start, end. If you have non-snooping
195 * Harvard caches, you need to implement this function.
197 * - start - virtual start address
198 * - end - virtual end address
200 ENTRY(arm920_coherent_user_range)
201 bic r0, r0, #CACHE_DLINESIZE - 1
202 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
203 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
204 add r0, r0, #CACHE_DLINESIZE
207 mcr p15, 0, r0, c7, c10, 4 @ drain WB
211 * flush_kern_dcache_page(void *page)
213 * Ensure no D cache aliasing occurs, either with itself or
216 * - addr - page aligned address
218 ENTRY(arm920_flush_kern_dcache_page)
220 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
221 add r0, r0, #CACHE_DLINESIZE
225 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
226 mcr p15, 0, r0, c7, c10, 4 @ drain WB
230 * dma_inv_range(start, end)
232 * Invalidate (discard) the specified virtual address range.
233 * May not write back any entries. If 'start' or 'end'
234 * are not cache line aligned, those lines must be written
237 * - start - virtual start address
238 * - end - virtual end address
242 ENTRY(arm920_dma_inv_range)
243 tst r0, #CACHE_DLINESIZE - 1
244 bic r0, r0, #CACHE_DLINESIZE - 1
245 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
246 tst r1, #CACHE_DLINESIZE - 1
247 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
248 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
249 add r0, r0, #CACHE_DLINESIZE
252 mcr p15, 0, r0, c7, c10, 4 @ drain WB
256 * dma_clean_range(start, end)
258 * Clean the specified virtual address range.
260 * - start - virtual start address
261 * - end - virtual end address
265 ENTRY(arm920_dma_clean_range)
266 bic r0, r0, #CACHE_DLINESIZE - 1
267 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
268 add r0, r0, #CACHE_DLINESIZE
271 mcr p15, 0, r0, c7, c10, 4 @ drain WB
275 * dma_flush_range(start, end)
277 * Clean and invalidate the specified virtual address range.
279 * - start - virtual start address
280 * - end - virtual end address
282 ENTRY(arm920_dma_flush_range)
283 bic r0, r0, #CACHE_DLINESIZE - 1
284 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
285 add r0, r0, #CACHE_DLINESIZE
288 mcr p15, 0, r0, c7, c10, 4 @ drain WB
291 ENTRY(arm920_cache_fns)
292 .long arm920_flush_kern_cache_all
293 .long arm920_flush_user_cache_all
294 .long arm920_flush_user_cache_range
295 .long arm920_coherent_kern_range
296 .long arm920_coherent_user_range
297 .long arm920_flush_kern_dcache_page
298 .long arm920_dma_inv_range
299 .long arm920_dma_clean_range
300 .long arm920_dma_flush_range
305 ENTRY(cpu_arm920_dcache_clean_area)
306 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
307 add r0, r0, #CACHE_DLINESIZE
308 subs r1, r1, #CACHE_DLINESIZE
312 /* =============================== PageTable ============================== */
315 * cpu_arm920_switch_mm(pgd)
317 * Set the translation base pointer to be as described by pgd.
319 * pgd: new page tables
322 ENTRY(cpu_arm920_switch_mm)
325 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
326 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
328 @ && 'Clean & Invalidate whole DCache'
329 @ && Re-written to use Index Ops.
330 @ && Uses registers r1, r3 and ip
332 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments
333 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
334 2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index
335 subs r3, r3, #1 << 26
336 bcs 2b @ entries 63 to 0
338 bcs 1b @ segments 7 to 0
340 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
341 mcr p15, 0, ip, c7, c10, 4 @ drain WB
342 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
343 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
348 * cpu_arm920_set_pte(ptep, pte)
350 * Set a PTE and flush it out
353 ENTRY(cpu_arm920_set_pte)
355 str r1, [r0], #-2048 @ linux version
357 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
359 bic r2, r1, #PTE_SMALL_AP_MASK
360 bic r2, r2, #PTE_TYPE_MASK
361 orr r2, r2, #PTE_TYPE_SMALL
363 tst r1, #L_PTE_USER @ User?
364 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
366 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
367 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
369 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
372 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
373 eor r3, r2, #0x0a @ C & small page?
377 str r2, [r0] @ hardware version
379 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
380 mcr p15, 0, r0, c7, c10, 4 @ drain WB
381 #endif /* CONFIG_MMU */
386 .type __arm920_setup, #function
389 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
390 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
392 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
394 mrc p15, 0, r0, c1, c0 @ get control register v4
395 ldr r5, arm920_cr1_clear
397 ldr r5, arm920_cr1_set
400 .size __arm920_setup, . - __arm920_setup
404 * .RVI ZFRS BLDP WCAM
405 * ..11 0001 ..11 0101
408 .type arm920_cr1_clear, #object
409 .type arm920_cr1_set, #object
418 * Purpose : Function pointers used to access above functions - all calls
421 .type arm920_processor_functions, #object
422 arm920_processor_functions:
423 .word v4t_early_abort
424 .word cpu_arm920_proc_init
425 .word cpu_arm920_proc_fin
426 .word cpu_arm920_reset
427 .word cpu_arm920_do_idle
428 .word cpu_arm920_dcache_clean_area
429 .word cpu_arm920_switch_mm
430 .word cpu_arm920_set_pte
431 .size arm920_processor_functions, . - arm920_processor_functions
435 .type cpu_arch_name, #object
438 .size cpu_arch_name, . - cpu_arch_name
440 .type cpu_elf_name, #object
443 .size cpu_elf_name, . - cpu_elf_name
445 .type cpu_arm920_name, #object
448 #ifndef CONFIG_CPU_ICACHE_DISABLE
451 #ifndef CONFIG_CPU_DCACHE_DISABLE
453 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
460 .size cpu_arm920_name, . - cpu_arm920_name
464 .section ".proc.info.init", #alloc, #execinstr
466 .type __arm920_proc_info,#object
470 .long PMD_TYPE_SECT | \
471 PMD_SECT_BUFFERABLE | \
472 PMD_SECT_CACHEABLE | \
474 PMD_SECT_AP_WRITE | \
479 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
480 .long cpu_arm920_name
481 .long arm920_processor_functions
484 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
485 .long arm920_cache_fns
489 .size __arm920_proc_info, . - __arm920_proc_info