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/config.h>
30 #include <linux/init.h>
31 #include <asm/assembler.h>
32 #include <asm/asm-offsets.h>
33 #include <asm/pgtable-hwdef.h>
34 #include <asm/pgtable.h>
35 #include <asm/procinfo.h>
36 #include <asm/ptrace.h>
39 * This is the maximum size of an area which will be invalidated
40 * using the single invalidate entry instructions. Anything larger
41 * than this, and we go for the whole cache.
43 * This value should be chosen such that we choose the cheapest
46 #define MAX_AREA_SIZE 32768
49 * The size of one data cache line.
51 #define CACHE_DLINESIZE 32
54 * The number of data cache segments.
56 #define CACHE_DSEGMENTS 16
59 * The number of lines in a cache segment.
61 #define CACHE_DENTRIES 64
64 * This is the size at which it becomes more efficient to
65 * clean the whole cache, rather than using the individual
66 * cache line maintainence instructions.
68 #define CACHE_DLIMIT 32768
72 * cpu_arm1020_proc_init()
74 ENTRY(cpu_arm1020_proc_init)
78 * cpu_arm1020_proc_fin()
80 ENTRY(cpu_arm1020_proc_fin)
82 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
84 bl arm1020_flush_kern_cache_all
85 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
86 bic r0, r0, #0x1000 @ ...i............
87 bic r0, r0, #0x000e @ ............wca.
88 mcr p15, 0, r0, c1, c0, 0 @ disable caches
92 * cpu_arm1020_reset(loc)
94 * Perform a soft reset of the system. Put the CPU into the
95 * same state as it would be if it had been reset, and branch
96 * to what would be the reset vector.
98 * loc: location to jump to for soft reset
101 ENTRY(cpu_arm1020_reset)
103 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
104 mcr p15, 0, ip, c7, c10, 4 @ drain WB
106 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
108 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
109 bic ip, ip, #0x000f @ ............wcam
110 bic ip, ip, #0x1100 @ ...i...s........
111 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
115 * cpu_arm1020_do_idle()
118 ENTRY(cpu_arm1020_do_idle)
119 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
122 /* ================================= CACHE ================================ */
126 * flush_user_cache_all()
128 * Invalidate all cache entries in a particular address
131 ENTRY(arm1020_flush_user_cache_all)
134 * flush_kern_cache_all()
136 * Clean and invalidate the entire cache.
138 ENTRY(arm1020_flush_kern_cache_all)
142 #ifndef CONFIG_CPU_DCACHE_DISABLE
143 mcr p15, 0, ip, c7, c10, 4 @ drain WB
144 mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments
145 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
146 2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index
147 mcr p15, 0, ip, c7, c10, 4 @ drain WB
148 subs r3, r3, #1 << 26
149 bcs 2b @ entries 63 to 0
151 bcs 1b @ segments 15 to 0
154 #ifndef CONFIG_CPU_ICACHE_DISABLE
155 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
157 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
161 * flush_user_cache_range(start, end, flags)
163 * Invalidate a range of cache entries in the specified
166 * - start - start address (inclusive)
167 * - end - end address (exclusive)
168 * - flags - vm_flags for this space
170 ENTRY(arm1020_flush_user_cache_range)
172 sub r3, r1, r0 @ calculate total size
173 cmp r3, #CACHE_DLIMIT
174 bhs __flush_whole_cache
176 #ifndef CONFIG_CPU_DCACHE_DISABLE
177 mcr p15, 0, ip, c7, c10, 4
178 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
179 mcr p15, 0, ip, c7, c10, 4 @ drain WB
180 add r0, r0, #CACHE_DLINESIZE
185 #ifndef CONFIG_CPU_ICACHE_DISABLE
186 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
188 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
192 * coherent_kern_range(start, end)
194 * Ensure coherency between the Icache and the Dcache in the
195 * region described by start. 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(arm1020_coherent_kern_range)
205 * coherent_user_range(start, end)
207 * Ensure coherency between the Icache and the Dcache in the
208 * region described by start. If you have non-snooping
209 * Harvard caches, you need to implement this function.
211 * - start - virtual start address
212 * - end - virtual end address
214 ENTRY(arm1020_coherent_user_range)
216 bic r0, r0, #CACHE_DLINESIZE - 1
217 mcr p15, 0, ip, c7, c10, 4
219 #ifndef CONFIG_CPU_DCACHE_DISABLE
220 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
221 mcr p15, 0, ip, c7, c10, 4 @ drain WB
223 #ifndef CONFIG_CPU_ICACHE_DISABLE
224 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
226 add r0, r0, #CACHE_DLINESIZE
229 mcr p15, 0, ip, c7, c10, 4 @ drain WB
233 * flush_kern_dcache_page(void *page)
235 * Ensure no D cache aliasing occurs, either with itself or
238 * - page - page aligned address
240 ENTRY(arm1020_flush_kern_dcache_page)
242 #ifndef CONFIG_CPU_DCACHE_DISABLE
244 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
245 mcr p15, 0, ip, c7, c10, 4 @ drain WB
246 add r0, r0, #CACHE_DLINESIZE
250 mcr p15, 0, ip, c7, c10, 4 @ drain WB
254 * dma_inv_range(start, end)
256 * Invalidate (discard) the specified virtual address range.
257 * May not write back any entries. If 'start' or 'end'
258 * are not cache line aligned, those lines must be written
261 * - start - virtual start address
262 * - end - virtual end address
266 ENTRY(arm1020_dma_inv_range)
268 #ifndef CONFIG_CPU_DCACHE_DISABLE
269 tst r0, #CACHE_DLINESIZE - 1
270 bic r0, r0, #CACHE_DLINESIZE - 1
271 mcrne p15, 0, ip, c7, c10, 4
272 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
273 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
274 tst r1, #CACHE_DLINESIZE - 1
275 mcrne p15, 0, ip, c7, c10, 4
276 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
277 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
278 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
279 add r0, r0, #CACHE_DLINESIZE
283 mcr p15, 0, ip, c7, c10, 4 @ drain WB
287 * dma_clean_range(start, end)
289 * Clean the specified virtual address range.
291 * - start - virtual start address
292 * - end - virtual end address
296 ENTRY(arm1020_dma_clean_range)
298 #ifndef CONFIG_CPU_DCACHE_DISABLE
299 bic r0, r0, #CACHE_DLINESIZE - 1
300 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
301 mcr p15, 0, ip, c7, c10, 4 @ drain WB
302 add r0, r0, #CACHE_DLINESIZE
306 mcr p15, 0, ip, c7, c10, 4 @ drain WB
310 * dma_flush_range(start, end)
312 * Clean and invalidate the specified virtual address range.
314 * - start - virtual start address
315 * - end - virtual end address
317 ENTRY(arm1020_dma_flush_range)
319 #ifndef CONFIG_CPU_DCACHE_DISABLE
320 bic r0, r0, #CACHE_DLINESIZE - 1
321 mcr p15, 0, ip, c7, c10, 4
322 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
323 mcr p15, 0, ip, c7, c10, 4 @ drain WB
324 add r0, r0, #CACHE_DLINESIZE
328 mcr p15, 0, ip, c7, c10, 4 @ drain WB
331 ENTRY(arm1020_cache_fns)
332 .long arm1020_flush_kern_cache_all
333 .long arm1020_flush_user_cache_all
334 .long arm1020_flush_user_cache_range
335 .long arm1020_coherent_kern_range
336 .long arm1020_coherent_user_range
337 .long arm1020_flush_kern_dcache_page
338 .long arm1020_dma_inv_range
339 .long arm1020_dma_clean_range
340 .long arm1020_dma_flush_range
343 ENTRY(cpu_arm1020_dcache_clean_area)
344 #ifndef CONFIG_CPU_DCACHE_DISABLE
346 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
347 mcr p15, 0, ip, c7, c10, 4 @ drain WB
348 add r0, r0, #CACHE_DLINESIZE
349 subs r1, r1, #CACHE_DLINESIZE
354 /* =============================== PageTable ============================== */
357 * cpu_arm1020_switch_mm(pgd)
359 * Set the translation base pointer to be as described by pgd.
361 * pgd: new page tables
364 ENTRY(cpu_arm1020_switch_mm)
366 #ifndef CONFIG_CPU_DCACHE_DISABLE
367 mcr p15, 0, r3, c7, c10, 4
368 mov r1, #0xF @ 16 segments
369 1: mov r3, #0x3F @ 64 entries
370 2: mov ip, r3, LSL #26 @ shift up entry
371 orr ip, ip, r1, LSL #5 @ shift in/up index
372 mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
374 mcr p15, 0, ip, c7, c10, 4
377 bge 2b @ entries 3F to 0
380 bge 1b @ segments 15 to 0
384 #ifndef CONFIG_CPU_ICACHE_DISABLE
385 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
387 mcr p15, 0, r1, c7, c10, 4 @ drain WB
388 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
389 mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
390 #endif /* CONFIG_MMU */
394 * cpu_arm1020_set_pte(ptep, pte)
396 * Set a PTE and flush it out
399 ENTRY(cpu_arm1020_set_pte)
401 str r1, [r0], #-2048 @ linux version
403 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
405 bic r2, r1, #PTE_SMALL_AP_MASK
406 bic r2, r2, #PTE_TYPE_MASK
407 orr r2, r2, #PTE_TYPE_SMALL
409 tst r1, #L_PTE_USER @ User?
410 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
412 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
413 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
415 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
418 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
419 eor r3, r1, #0x0a @ C & small page?
423 str r2, [r0] @ hardware version
425 #ifndef CONFIG_CPU_DCACHE_DISABLE
426 mcr p15, 0, r0, c7, c10, 4
427 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
429 mcr p15, 0, r0, c7, c10, 4 @ drain WB
430 #endif /* CONFIG_MMU */
435 .type __arm1020_setup, #function
438 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
439 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
441 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
443 mrc p15, 0, r0, c1, c0 @ get control register v4
444 ldr r5, arm1020_cr1_clear
446 ldr r5, arm1020_cr1_set
448 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
449 orr r0, r0, #0x4000 @ .R.. .... .... ....
452 .size __arm1020_setup, . - __arm1020_setup
456 * .RVI ZFRS BLDP WCAM
457 * .011 1001 ..11 0101
459 .type arm1020_cr1_clear, #object
460 .type arm1020_cr1_set, #object
469 * Purpose : Function pointers used to access above functions - all calls
472 .type arm1020_processor_functions, #object
473 arm1020_processor_functions:
474 .word v4t_early_abort
475 .word cpu_arm1020_proc_init
476 .word cpu_arm1020_proc_fin
477 .word cpu_arm1020_reset
478 .word cpu_arm1020_do_idle
479 .word cpu_arm1020_dcache_clean_area
480 .word cpu_arm1020_switch_mm
481 .word cpu_arm1020_set_pte
482 .size arm1020_processor_functions, . - arm1020_processor_functions
486 .type cpu_arch_name, #object
489 .size cpu_arch_name, . - cpu_arch_name
491 .type cpu_elf_name, #object
494 .size cpu_elf_name, . - cpu_elf_name
496 .type cpu_arm1020_name, #object
499 #ifndef CONFIG_CPU_ICACHE_DISABLE
502 #ifndef CONFIG_CPU_DCACHE_DISABLE
504 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
510 #ifndef CONFIG_CPU_BPREDICT_DISABLE
513 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
517 .size cpu_arm1020_name, . - cpu_arm1020_name
521 .section ".proc.info.init", #alloc, #execinstr
523 .type __arm1020_proc_info,#object
525 .long 0x4104a200 @ ARM 1020T (Architecture v5T)
527 .long PMD_TYPE_SECT | \
528 PMD_SECT_AP_WRITE | \
533 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
534 .long cpu_arm1020_name
535 .long arm1020_processor_functions
538 .long arm1020_cache_fns
539 .size __arm1020_proc_info, . - __arm1020_proc_info