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.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * These are the low level assembler for performing cache and TLB
23 * functions on the arm1020.
25 * CONFIG_CPU_ARM1020_CPU_IDLE -> nohlt
27 #include <linux/linkage.h>
28 #include <linux/config.h>
29 #include <linux/init.h>
30 #include <asm/assembler.h>
31 #include <asm/constants.h>
32 #include <asm/pgtable.h>
33 #include <asm/procinfo.h>
34 #include <asm/ptrace.h>
35 #include <asm/hardware.h>
38 * This is the maximum size of an area which will be invalidated
39 * using the single invalidate entry instructions. Anything larger
40 * than this, and we go for the whole cache.
42 * This value should be chosen such that we choose the cheapest
45 #define MAX_AREA_SIZE 32768
48 * The size of one data cache line.
50 #define CACHE_DLINESIZE 32
53 * The number of data cache segments.
55 #define CACHE_DSEGMENTS 16
58 * The number of lines in a cache segment.
60 #define CACHE_DENTRIES 64
63 * This is the size at which it becomes more efficient to
64 * clean the whole cache, rather than using the individual
65 * cache line maintainence instructions.
67 #define CACHE_DLIMIT 32768
71 * cpu_arm1020_proc_init()
73 ENTRY(cpu_arm1020_proc_init)
77 * cpu_arm1020_proc_fin()
79 ENTRY(cpu_arm1020_proc_fin)
81 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
83 bl arm1020_flush_kern_cache_all
84 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
85 bic r0, r0, #0x1000 @ ...i............
86 bic r0, r0, #0x000e @ ............wca.
87 mcr p15, 0, r0, c1, c0, 0 @ disable caches
91 * cpu_arm1020_reset(loc)
93 * Perform a soft reset of the system. Put the CPU into the
94 * same state as it would be if it had been reset, and branch
95 * to what would be the reset vector.
97 * loc: location to jump to for soft reset
100 ENTRY(cpu_arm1020_reset)
102 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
103 mcr p15, 0, ip, c7, c10, 4 @ drain WB
104 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_arm1020_do_idle()
115 ENTRY(cpu_arm1020_do_idle)
116 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
119 /* ================================= CACHE ================================ */
123 * flush_user_cache_all()
125 * Invalidate all cache entries in a particular address
128 ENTRY(arm1020_flush_user_cache_all)
131 * flush_kern_cache_all()
133 * Clean and invalidate the entire cache.
135 ENTRY(arm1020_flush_kern_cache_all)
139 #ifndef CONFIG_CPU_DCACHE_DISABLE
140 mcr p15, 0, ip, c7, c10, 4 @ drain WB
141 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 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 mcr p15, 0, ip, c7, c10, 4 @ drain WB
145 subs r3, r3, #1 << 26
146 bcs 2b @ entries 63 to 0
148 bcs 1b @ segments 15 to 0
151 #ifndef CONFIG_CPU_ICACHE_DISABLE
152 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
154 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
158 * flush_user_cache_range(start, end, flags)
160 * Invalidate a range of cache entries in the specified
163 * - start - start address (inclusive)
164 * - end - end address (exclusive)
165 * - flags - vm_flags for this space
167 ENTRY(arm1020_flush_user_cache_range)
169 sub r3, r1, r0 @ calculate total size
170 cmp r3, #CACHE_DLIMIT
171 bhs __flush_whole_cache
173 #ifndef CONFIG_CPU_DCACHE_DISABLE
174 mcr p15, 0, ip, c7, c10, 4
175 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
176 mcr p15, 0, ip, c7, c10, 4 @ drain WB
177 add r0, r0, #CACHE_DLINESIZE
182 #ifndef CONFIG_CPU_ICACHE_DISABLE
183 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
185 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
189 * coherent_kern_range(start, end)
191 * Ensure coherency between the Icache and the Dcache in the
192 * region described by start. If you have non-snooping
193 * Harvard caches, you need to implement this function.
195 * - start - virtual start address
196 * - end - virtual end address
198 ENTRY(arm1020_coherent_kern_range)
200 bic r0, r0, #CACHE_DLINESIZE - 1
201 mcr p15, 0, ip, c7, c10, 4
203 #ifndef CONFIG_CPU_DCACHE_DISABLE
204 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
205 mcr p15, 0, ip, c7, c10, 4 @ drain WB
207 #ifndef CONFIG_CPU_ICACHE_DISABLE
208 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
210 add r0, r0, #CACHE_DLINESIZE
213 mcr p15, 0, ip, c7, c10, 4 @ drain WB
217 * flush_kern_dcache_page(void *page)
219 * Ensure no D cache aliasing occurs, either with itself or
222 * - page - page aligned address
224 ENTRY(arm1020_flush_kern_dcache_page)
226 #ifndef CONFIG_CPU_DCACHE_DISABLE
228 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
229 mcr p15, 0, ip, c7, c10, 4 @ drain WB
230 add r0, r0, #CACHE_DLINESIZE
234 mcr p15, 0, ip, c7, c10, 4 @ drain WB
238 * dma_inv_range(start, end)
240 * Invalidate (discard) the specified virtual address range.
241 * May not write back any entries. If 'start' or 'end'
242 * are not cache line aligned, those lines must be written
245 * - start - virtual start address
246 * - end - virtual end address
250 ENTRY(arm1020_dma_inv_range)
252 #ifndef CONFIG_CPU_DCACHE_DISABLE
253 tst r0, #CACHE_DLINESIZE - 1
254 bic r0, r0, #CACHE_DLINESIZE - 1
255 mcrne p15, 0, ip, c7, c10, 4
256 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
257 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
258 tst r1, #CACHE_DLINESIZE - 1
259 mcrne p15, 0, ip, c7, c10, 4
260 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
261 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
262 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
263 add r0, r0, #CACHE_DLINESIZE
267 mcr p15, 0, ip, c7, c10, 4 @ drain WB
271 * dma_clean_range(start, end)
273 * Clean the specified virtual address range.
275 * - start - virtual start address
276 * - end - virtual end address
280 ENTRY(arm1020_dma_clean_range)
282 #ifndef CONFIG_CPU_DCACHE_DISABLE
283 bic r0, r0, #CACHE_DLINESIZE - 1
284 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
285 mcr p15, 0, ip, c7, c10, 4 @ drain WB
286 add r0, r0, #CACHE_DLINESIZE
290 mcr p15, 0, ip, c7, c10, 4 @ drain WB
294 * dma_flush_range(start, end)
296 * Clean and invalidate the specified virtual address range.
298 * - start - virtual start address
299 * - end - virtual end address
301 ENTRY(arm1020_dma_flush_range)
303 #ifndef CONFIG_CPU_DCACHE_DISABLE
304 bic r0, r0, #CACHE_DLINESIZE - 1
305 mcr p15, 0, ip, c7, c10, 4
306 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
307 mcr p15, 0, ip, c7, c10, 4 @ drain WB
308 add r0, r0, #CACHE_DLINESIZE
312 mcr p15, 0, ip, c7, c10, 4 @ drain WB
315 ENTRY(arm1020_cache_fns)
316 .long arm1020_flush_kern_cache_all
317 .long arm1020_flush_user_cache_all
318 .long arm1020_flush_user_cache_range
319 .long arm1020_coherent_kern_range
320 .long arm1020_flush_kern_dcache_page
321 .long arm1020_dma_inv_range
322 .long arm1020_dma_clean_range
323 .long arm1020_dma_flush_range
326 ENTRY(cpu_arm1020_dcache_clean_area)
327 #ifndef CONFIG_CPU_DCACHE_DISABLE
329 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
330 mcr p15, 0, ip, c7, c10, 4 @ drain WB
331 add r0, r0, #CACHE_DLINESIZE
332 subs r1, r1, #CACHE_DLINESIZE
337 /* =============================== PageTable ============================== */
340 * cpu_arm1020_switch_mm(pgd)
342 * Set the translation base pointer to be as described by pgd.
344 * pgd: new page tables
347 ENTRY(cpu_arm1020_switch_mm)
348 #ifndef CONFIG_CPU_DCACHE_DISABLE
349 mcr p15, 0, r3, c7, c10, 4
350 mov r1, #0xF @ 16 segments
351 1: mov r3, #0x3F @ 64 entries
352 2: mov ip, r3, LSL #26 @ shift up entry
353 orr ip, ip, r1, LSL #5 @ shift in/up index
354 mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
356 mcr p15, 0, ip, c7, c10, 4
359 bge 2b @ entries 3F to 0
362 bge 1b @ segments 15 to 0
366 #ifndef CONFIG_CPU_ICACHE_DISABLE
367 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
369 mcr p15, 0, r1, c7, c10, 4 @ drain WB
370 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
371 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
375 * cpu_arm1020_set_pte(ptep, pte)
377 * Set a PTE and flush it out
380 ENTRY(cpu_arm1020_set_pte)
381 str r1, [r0], #-2048 @ linux version
383 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
385 bic r2, r1, #PTE_SMALL_AP_MASK
386 bic r2, r2, #PTE_TYPE_MASK
387 orr r2, r2, #PTE_TYPE_SMALL
389 tst r1, #L_PTE_USER @ User?
390 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
392 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
393 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
395 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
398 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
399 eor r3, r1, #0x0a @ C & small page?
403 str r2, [r0] @ hardware version
405 #ifndef CONFIG_CPU_DCACHE_DISABLE
406 mcr p15, 0, r0, c7, c10, 4
407 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
409 mcr p15, 0, r0, c7, c10, 4 @ drain WB
414 .type __arm1020_setup, #function
417 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
418 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
419 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
420 mcr p15, 0, r4, c2, c0 @ load page table pointer
421 mov r0, #0x1f @ Domains 0, 1 = client
422 mcr p15, 0, r0, c3, c0 @ load domain access register
423 mrc p15, 0, r0, c1, c0 @ get control register v4
425 * Clear out 'unwanted' bits (then put them in if we need them)
427 bic r0, r0, #0x1e00 @ i...??r.........
428 bic r0, r0, #0x000e @ ............wca.
430 * Turn on what we want
432 orr r0, r0, #0x0031 @ ..........DP...M
433 orr r0, r0, #0x0100 @ .......S........
435 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
436 orr r0, r0, #0x4000 @ .R..............
438 #ifndef CONFIG_CPU_BPREDICT_DISABLE
439 orr r0, r0, #0x0800 @ ....Z...........
441 #ifndef CONFIG_CPU_DCACHE_DISABLE
442 orr r0, r0, #0x0004 @ Enable D cache
444 #ifndef CONFIG_CPU_ICACHE_DISABLE
445 orr r0, r0, #0x1000 @ I Cache on
448 .size __arm1020_setup, . - __arm1020_setup
453 * Purpose : Function pointers used to access above functions - all calls
456 .type arm1020_processor_functions, #object
457 arm1020_processor_functions:
458 .word v4t_early_abort
459 .word cpu_arm1020_proc_init
460 .word cpu_arm1020_proc_fin
461 .word cpu_arm1020_reset
462 .word cpu_arm1020_do_idle
463 .word cpu_arm1020_dcache_clean_area
464 .word cpu_arm1020_switch_mm
465 .word cpu_arm1020_set_pte
466 .size arm1020_processor_functions, . - arm1020_processor_functions
470 .type cpu_arch_name, #object
473 .size cpu_arch_name, . - cpu_arch_name
475 .type cpu_elf_name, #object
478 .size cpu_elf_name, . - cpu_elf_name
480 .type cpu_arm1020_name, #object
483 #ifndef CONFIG_CPU_ICACHE_DISABLE
486 #ifndef CONFIG_CPU_DCACHE_DISABLE
488 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
494 #ifndef CONFIG_CPU_BPREDICT_DISABLE
497 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
501 .size cpu_arm1020_name, . - cpu_arm1020_name
505 .section ".proc.info", #alloc, #execinstr
507 .type __arm1020_proc_info,#object
509 .long 0x4104a200 @ ARM 1020T (Architecture v5T)
511 .long 0x00000c02 @ mmuflags
515 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
516 .long cpu_arm1020_name
517 .long arm1020_processor_functions
520 .long arm1020_cache_fns
521 .size __arm1020_proc_info, . - __arm1020_proc_info