2 * linux/arch/arm/mm/proc-arm1020.S: MMU functions for ARM1020
4 * Copyright (C) 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 arm1020.
26 * CONFIG_CPU_ARM1020_CPU_IDLE -> nohlt
28 #include <linux/linkage.h>
29 #include <linux/init.h>
30 #include <asm/assembler.h>
31 #include <asm/asm-offsets.h>
32 #include <asm/pgtable-hwdef.h>
33 #include <asm/pgtable.h>
34 #include <asm/procinfo.h>
35 #include <asm/ptrace.h>
37 #include "proc-macros.S"
40 * This is the maximum size of an area which will be invalidated
41 * using the single invalidate entry instructions. Anything larger
42 * than this, and we go for the whole cache.
44 * This value should be chosen such that we choose the cheapest
47 #define MAX_AREA_SIZE 32768
50 * The size of one data cache line.
52 #define CACHE_DLINESIZE 32
55 * The number of data cache segments.
57 #define CACHE_DSEGMENTS 16
60 * The number of lines in a cache segment.
62 #define CACHE_DENTRIES 64
65 * This is the size at which it becomes more efficient to
66 * clean the whole cache, rather than using the individual
67 * cache line maintainence instructions.
69 #define CACHE_DLIMIT 32768
73 * cpu_arm1020_proc_init()
75 ENTRY(cpu_arm1020_proc_init)
79 * cpu_arm1020_proc_fin()
81 ENTRY(cpu_arm1020_proc_fin)
83 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
85 bl arm1020_flush_kern_cache_all
86 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
87 bic r0, r0, #0x1000 @ ...i............
88 bic r0, r0, #0x000e @ ............wca.
89 mcr p15, 0, r0, c1, c0, 0 @ disable caches
93 * cpu_arm1020_reset(loc)
95 * Perform a soft reset of the system. Put the CPU into the
96 * same state as it would be if it had been reset, and branch
97 * to what would be the reset vector.
99 * loc: location to jump to for soft reset
102 ENTRY(cpu_arm1020_reset)
104 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
105 mcr p15, 0, ip, c7, c10, 4 @ drain WB
107 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
109 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
110 bic ip, ip, #0x000f @ ............wcam
111 bic ip, ip, #0x1100 @ ...i...s........
112 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
116 * cpu_arm1020_do_idle()
119 ENTRY(cpu_arm1020_do_idle)
120 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
123 /* ================================= CACHE ================================ */
127 * flush_user_cache_all()
129 * Invalidate all cache entries in a particular address
132 ENTRY(arm1020_flush_user_cache_all)
135 * flush_kern_cache_all()
137 * Clean and invalidate the entire cache.
139 ENTRY(arm1020_flush_kern_cache_all)
143 #ifndef CONFIG_CPU_DCACHE_DISABLE
144 mcr p15, 0, ip, c7, c10, 4 @ drain WB
145 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
146 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
147 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
148 mcr p15, 0, ip, c7, c10, 4 @ drain WB
149 subs r3, r3, #1 << 26
150 bcs 2b @ entries 63 to 0
152 bcs 1b @ segments 15 to 0
155 #ifndef CONFIG_CPU_ICACHE_DISABLE
156 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
158 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
162 * flush_user_cache_range(start, end, flags)
164 * Invalidate a range of cache entries in the specified
167 * - start - start address (inclusive)
168 * - end - end address (exclusive)
169 * - flags - vm_flags for this space
171 ENTRY(arm1020_flush_user_cache_range)
173 sub r3, r1, r0 @ calculate total size
174 cmp r3, #CACHE_DLIMIT
175 bhs __flush_whole_cache
177 #ifndef CONFIG_CPU_DCACHE_DISABLE
178 mcr p15, 0, ip, c7, c10, 4
179 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
180 mcr p15, 0, ip, c7, c10, 4 @ drain WB
181 add r0, r0, #CACHE_DLINESIZE
186 #ifndef CONFIG_CPU_ICACHE_DISABLE
187 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
189 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
193 * coherent_kern_range(start, end)
195 * Ensure coherency between the Icache and the Dcache in the
196 * region described by start. 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(arm1020_coherent_kern_range)
206 * coherent_user_range(start, end)
208 * Ensure coherency between the Icache and the Dcache in the
209 * region described by start. If you have non-snooping
210 * Harvard caches, you need to implement this function.
212 * - start - virtual start address
213 * - end - virtual end address
215 ENTRY(arm1020_coherent_user_range)
217 bic r0, r0, #CACHE_DLINESIZE - 1
218 mcr p15, 0, ip, c7, c10, 4
220 #ifndef CONFIG_CPU_DCACHE_DISABLE
221 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
222 mcr p15, 0, ip, c7, c10, 4 @ drain WB
224 #ifndef CONFIG_CPU_ICACHE_DISABLE
225 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
227 add r0, r0, #CACHE_DLINESIZE
230 mcr p15, 0, ip, c7, c10, 4 @ drain WB
234 * flush_kern_dcache_page(void *page)
236 * Ensure no D cache aliasing occurs, either with itself or
239 * - page - page aligned address
241 ENTRY(arm1020_flush_kern_dcache_page)
243 #ifndef CONFIG_CPU_DCACHE_DISABLE
245 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
246 mcr p15, 0, ip, c7, c10, 4 @ drain WB
247 add r0, r0, #CACHE_DLINESIZE
251 mcr p15, 0, ip, c7, c10, 4 @ drain WB
255 * dma_inv_range(start, end)
257 * Invalidate (discard) the specified virtual address range.
258 * May not write back any entries. If 'start' or 'end'
259 * are not cache line aligned, those lines must be written
262 * - start - virtual start address
263 * - end - virtual end address
267 ENTRY(arm1020_dma_inv_range)
269 #ifndef CONFIG_CPU_DCACHE_DISABLE
270 tst r0, #CACHE_DLINESIZE - 1
271 bic r0, r0, #CACHE_DLINESIZE - 1
272 mcrne p15, 0, ip, c7, c10, 4
273 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
274 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
275 tst r1, #CACHE_DLINESIZE - 1
276 mcrne p15, 0, ip, c7, c10, 4
277 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
278 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
279 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
280 add r0, r0, #CACHE_DLINESIZE
284 mcr p15, 0, ip, c7, c10, 4 @ drain WB
288 * dma_clean_range(start, end)
290 * Clean the specified virtual address range.
292 * - start - virtual start address
293 * - end - virtual end address
297 ENTRY(arm1020_dma_clean_range)
299 #ifndef CONFIG_CPU_DCACHE_DISABLE
300 bic r0, r0, #CACHE_DLINESIZE - 1
301 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
302 mcr p15, 0, ip, c7, c10, 4 @ drain WB
303 add r0, r0, #CACHE_DLINESIZE
307 mcr p15, 0, ip, c7, c10, 4 @ drain WB
311 * dma_flush_range(start, end)
313 * Clean and invalidate the specified virtual address range.
315 * - start - virtual start address
316 * - end - virtual end address
318 ENTRY(arm1020_dma_flush_range)
320 #ifndef CONFIG_CPU_DCACHE_DISABLE
321 bic r0, r0, #CACHE_DLINESIZE - 1
322 mcr p15, 0, ip, c7, c10, 4
323 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
324 mcr p15, 0, ip, c7, c10, 4 @ drain WB
325 add r0, r0, #CACHE_DLINESIZE
329 mcr p15, 0, ip, c7, c10, 4 @ drain WB
332 ENTRY(arm1020_cache_fns)
333 .long arm1020_flush_kern_cache_all
334 .long arm1020_flush_user_cache_all
335 .long arm1020_flush_user_cache_range
336 .long arm1020_coherent_kern_range
337 .long arm1020_coherent_user_range
338 .long arm1020_flush_kern_dcache_page
339 .long arm1020_dma_inv_range
340 .long arm1020_dma_clean_range
341 .long arm1020_dma_flush_range
344 ENTRY(cpu_arm1020_dcache_clean_area)
345 #ifndef CONFIG_CPU_DCACHE_DISABLE
347 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
348 mcr p15, 0, ip, c7, c10, 4 @ drain WB
349 add r0, r0, #CACHE_DLINESIZE
350 subs r1, r1, #CACHE_DLINESIZE
355 /* =============================== PageTable ============================== */
358 * cpu_arm1020_switch_mm(pgd)
360 * Set the translation base pointer to be as described by pgd.
362 * pgd: new page tables
365 ENTRY(cpu_arm1020_switch_mm)
367 #ifndef CONFIG_CPU_DCACHE_DISABLE
368 mcr p15, 0, r3, c7, c10, 4
369 mov r1, #0xF @ 16 segments
370 1: mov r3, #0x3F @ 64 entries
371 2: mov ip, r3, LSL #26 @ shift up entry
372 orr ip, ip, r1, LSL #5 @ shift in/up index
373 mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
375 mcr p15, 0, ip, c7, c10, 4
378 bge 2b @ entries 3F to 0
381 bge 1b @ segments 15 to 0
385 #ifndef CONFIG_CPU_ICACHE_DISABLE
386 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
388 mcr p15, 0, r1, c7, c10, 4 @ drain WB
389 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
390 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
391 #endif /* CONFIG_MMU */
395 * cpu_arm1020_set_pte(ptep, pte)
397 * Set a PTE and flush it out
400 ENTRY(cpu_arm1020_set_pte)
402 str r1, [r0], #-2048 @ linux version
404 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
406 bic r2, r1, #PTE_SMALL_AP_MASK
407 bic r2, r2, #PTE_TYPE_MASK
408 orr r2, r2, #PTE_TYPE_SMALL
410 tst r1, #L_PTE_USER @ User?
411 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
413 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
414 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
416 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
419 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
420 eor r3, r1, #0x0a @ C & small page?
424 str r2, [r0] @ hardware version
426 #ifndef CONFIG_CPU_DCACHE_DISABLE
427 mcr p15, 0, r0, c7, c10, 4
428 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
430 mcr p15, 0, r0, c7, c10, 4 @ drain WB
431 #endif /* CONFIG_MMU */
436 .type __arm1020_setup, #function
439 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
440 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
442 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
445 adr r5, arm1020_crval
447 mrc p15, 0, r0, c1, c0 @ get control register v4
450 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
451 orr r0, r0, #0x4000 @ .R.. .... .... ....
454 .size __arm1020_setup, . - __arm1020_setup
458 * .RVI ZFRS BLDP WCAM
459 * .011 1001 ..11 0101
461 .type arm1020_crval, #object
463 crval clear=0x0000593f, mmuset=0x00003935, ucset=0x00001930
468 * Purpose : Function pointers used to access above functions - all calls
471 .type arm1020_processor_functions, #object
472 arm1020_processor_functions:
473 .word v4t_early_abort
474 .word cpu_arm1020_proc_init
475 .word cpu_arm1020_proc_fin
476 .word cpu_arm1020_reset
477 .word cpu_arm1020_do_idle
478 .word cpu_arm1020_dcache_clean_area
479 .word cpu_arm1020_switch_mm
480 .word cpu_arm1020_set_pte
481 .size arm1020_processor_functions, . - arm1020_processor_functions
485 .type cpu_arch_name, #object
488 .size cpu_arch_name, . - cpu_arch_name
490 .type cpu_elf_name, #object
493 .size cpu_elf_name, . - cpu_elf_name
495 .type cpu_arm1020_name, #object
498 #ifndef CONFIG_CPU_ICACHE_DISABLE
501 #ifndef CONFIG_CPU_DCACHE_DISABLE
503 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
509 #ifndef CONFIG_CPU_BPREDICT_DISABLE
512 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
516 .size cpu_arm1020_name, . - cpu_arm1020_name
520 .section ".proc.info.init", #alloc, #execinstr
522 .type __arm1020_proc_info,#object
524 .long 0x4104a200 @ ARM 1020T (Architecture v5T)
526 .long PMD_TYPE_SECT | \
527 PMD_SECT_AP_WRITE | \
529 .long PMD_TYPE_SECT | \
530 PMD_SECT_AP_WRITE | \
535 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
536 .long cpu_arm1020_name
537 .long arm1020_processor_functions
540 .long arm1020_cache_fns
541 .size __arm1020_proc_info, . - __arm1020_proc_info