| blob | 089c0b5e454fccbdbc63a4d4e9d72d15baa7075a |
1 /*
2 * linux/arch/arm/mm/proc-v7.S
3 *
4 * Copyright (C) 2001 Deep Blue Solutions Ltd.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This is the "shell" of the ARMv7 processor support.
11 */
12 #include <linux/init.h>
13 #include <linux/linkage.h>
14 #include <asm/assembler.h>
15 #include <asm/asm-offsets.h>
16 #include <asm/hwcap.h>
17 #include <asm/pgtable-hwdef.h>
18 #include <asm/pgtable.h>
20 #include "proc-macros.S"
22 #define TTB_S (1 << 1)
23 #define TTB_RGN_NC (0 << 3)
24 #define TTB_RGN_OC_WBWA (1 << 3)
25 #define TTB_RGN_OC_WT (2 << 3)
26 #define TTB_RGN_OC_WB (3 << 3)
27 #define TTB_NOS (1 << 5)
28 #define TTB_IRGN_NC ((0 << 0) | (0 << 6))
29 #define TTB_IRGN_WBWA ((0 << 0) | (1 << 6))
30 #define TTB_IRGN_WT ((1 << 0) | (0 << 6))
31 #define TTB_IRGN_WB ((1 << 0) | (1 << 6))
33 /* PTWs cacheable, inner WB not shareable, outer WB not shareable */
34 #define TTB_FLAGS_UP TTB_IRGN_WB|TTB_RGN_OC_WB
35 #define PMD_FLAGS_UP PMD_SECT_WB
37 /* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */
38 #define TTB_FLAGS_SMP TTB_IRGN_WBWA|TTB_S|TTB_NOS|TTB_RGN_OC_WBWA
39 #define PMD_FLAGS_SMP PMD_SECT_WBWA|PMD_SECT_S
41 ENTRY(cpu_v7_proc_init)
42 mov pc, lr
43 ENDPROC(cpu_v7_proc_init)
45 ENTRY(cpu_v7_proc_fin)
46 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
47 bic r0, r0, #0x1000 @ ...i............
48 bic r0, r0, #0x0006 @ .............ca.
49 mcr p15, 0, r0, c1, c0, 0 @ disable caches
50 mov pc, lr
51 ENDPROC(cpu_v7_proc_fin)
53 /*
54 * cpu_v7_reset(loc)
55 *
56 * Perform a soft reset of the system. Put the CPU into the
57 * same state as it would be if it had been reset, and branch
58 * to what would be the reset vector.
59 *
60 * - loc - location to jump to for soft reset
61 */
62 .align 5
63 ENTRY(cpu_v7_reset)
64 mov pc, r0
65 ENDPROC(cpu_v7_reset)
67 /*
68 * cpu_v7_do_idle()
69 *
70 * Idle the processor (eg, wait for interrupt).
71 *
72 * IRQs are already disabled.
73 */
74 ENTRY(cpu_v7_do_idle)
75 dsb @ WFI may enter a low-power mode
76 wfi
77 mov pc, lr
78 ENDPROC(cpu_v7_do_idle)
80 ENTRY(cpu_v7_dcache_clean_area)
81 #ifndef TLB_CAN_READ_FROM_L1_CACHE
82 dcache_line_size r2, r3
83 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
84 add r0, r0, r2
85 subs r1, r1, r2
86 bhi 1b
87 dsb
88 #endif
89 mov pc, lr
90 ENDPROC(cpu_v7_dcache_clean_area)
92 /*
93 * cpu_v7_switch_mm(pgd_phys, tsk)
94 *
95 * Set the translation table base pointer to be pgd_phys
96 *
97 * - pgd_phys - physical address of new TTB
98 *
99 * It is assumed that:
100 * - we are not using split page tables
101 */
102 ENTRY(cpu_v7_switch_mm)
103 #ifdef CONFIG_MMU
104 mov r2, #0
105 ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id
106 ALT_SMP(orr r0, r0, #TTB_FLAGS_SMP)
107 ALT_UP(orr r0, r0, #TTB_FLAGS_UP)
108 #ifdef CONFIG_ARM_ERRATA_430973
109 mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB
110 #endif
111 #ifdef CONFIG_ARM_ERRATA_754322
112 dsb
113 #endif
114 mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID
115 isb
116 1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
117 isb
118 #ifdef CONFIG_ARM_ERRATA_754322
119 dsb
120 #endif
121 mcr p15, 0, r1, c13, c0, 1 @ set context ID
122 isb
123 #endif
124 mov pc, lr
125 ENDPROC(cpu_v7_switch_mm)
127 /*
128 * cpu_v7_set_pte_ext(ptep, pte)
129 *
130 * Set a level 2 translation table entry.
131 *
132 * - ptep - pointer to level 2 translation table entry
133 * (hardware version is stored at +2048 bytes)
134 * - pte - PTE value to store
135 * - ext - value for extended PTE bits
136 */
137 ENTRY(cpu_v7_set_pte_ext)
138 #ifdef CONFIG_MMU
139 str r1, [r0] @ linux version
141 bic r3, r1, #0x000003f0
142 bic r3, r3, #PTE_TYPE_MASK
143 orr r3, r3, r2
144 orr r3, r3, #PTE_EXT_AP0 | 2
146 tst r1, #1 << 4
147 orrne r3, r3, #PTE_EXT_TEX(1)
149 eor r1, r1, #L_PTE_DIRTY
150 tst r1, #L_PTE_RDONLY | L_PTE_DIRTY
151 orrne r3, r3, #PTE_EXT_APX
153 tst r1, #L_PTE_USER
154 orrne r3, r3, #PTE_EXT_AP1
155 #ifdef CONFIG_CPU_USE_DOMAINS
156 @ allow kernel read/write access to read-only user pages
157 tstne r3, #PTE_EXT_APX
158 bicne r3, r3, #PTE_EXT_APX | PTE_EXT_AP0
159 #endif
161 tst r1, #L_PTE_XN
162 orrne r3, r3, #PTE_EXT_XN
164 tst r1, #L_PTE_YOUNG
165 tstne r1, #L_PTE_PRESENT
166 moveq r3, #0
168 ARM( str r3, [r0, #2048]! )
169 THUMB( add r0, r0, #2048 )
170 THUMB( str r3, [r0] )
171 mcr p15, 0, r0, c7, c10, 1 @ flush_pte
172 #endif
173 mov pc, lr
174 ENDPROC(cpu_v7_set_pte_ext)
176 cpu_v7_name:
177 .ascii "ARMv7 Processor"
178 .align
180 /*
181 * Memory region attributes with SCTLR.TRE=1
182 *
183 * n = TEX[0],C,B
184 * TR = PRRR[2n+1:2n] - memory type
185 * IR = NMRR[2n+1:2n] - inner cacheable property
186 * OR = NMRR[2n+17:2n+16] - outer cacheable property
187 *
188 * n TR IR OR
189 * UNCACHED 000 00
190 * BUFFERABLE 001 10 00 00
191 * WRITETHROUGH 010 10 10 10
192 * WRITEBACK 011 10 11 11
193 * reserved 110
194 * WRITEALLOC 111 10 01 01
195 * DEV_SHARED 100 01
196 * DEV_NONSHARED 100 01
197 * DEV_WC 001 10
198 * DEV_CACHED 011 10
199 *
200 * Other attributes:
201 *
202 * DS0 = PRRR[16] = 0 - device shareable property
203 * DS1 = PRRR[17] = 1 - device shareable property
204 * NS0 = PRRR[18] = 0 - normal shareable property
205 * NS1 = PRRR[19] = 1 - normal shareable property
206 * NOS = PRRR[24+n] = 1 - not outer shareable
207 */
208 .equ PRRR, 0xff0a81a8
209 .equ NMRR, 0x40e040e0
211 /* Suspend/resume support: derived from arch/arm/mach-s5pv210/sleep.S */
212 .globl cpu_v7_suspend_size
213 .equ cpu_v7_suspend_size, 4 * 9
214 #ifdef CONFIG_PM_SLEEP
215 ENTRY(cpu_v7_do_suspend)
216 stmfd sp!, {r4 - r11, lr}
217 mrc p15, 0, r4, c13, c0, 0 @ FCSE/PID
218 mrc p15, 0, r5, c13, c0, 1 @ Context ID
219 mrc p15, 0, r6, c13, c0, 3 @ User r/o thread ID
220 stmia r0!, {r4 - r6}
221 mrc p15, 0, r6, c3, c0, 0 @ Domain ID
222 mrc p15, 0, r7, c2, c0, 0 @ TTB 0
223 mrc p15, 0, r8, c2, c0, 1 @ TTB 1
224 mrc p15, 0, r9, c1, c0, 0 @ Control register
225 mrc p15, 0, r10, c1, c0, 1 @ Auxiliary control register
226 mrc p15, 0, r11, c1, c0, 2 @ Co-processor access control
227 stmia r0, {r6 - r11}
228 ldmfd sp!, {r4 - r11, pc}
229 ENDPROC(cpu_v7_do_suspend)
231 ENTRY(cpu_v7_do_resume)
232 mov ip, #0
233 mcr p15, 0, ip, c8, c7, 0 @ invalidate TLBs
234 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
235 ldmia r0!, {r4 - r6}
236 mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID
237 mcr p15, 0, r5, c13, c0, 1 @ Context ID
238 mcr p15, 0, r6, c13, c0, 3 @ User r/o thread ID
239 ldmia r0, {r6 - r11}
240 mcr p15, 0, r6, c3, c0, 0 @ Domain ID
241 mcr p15, 0, r7, c2, c0, 0 @ TTB 0
242 mcr p15, 0, r8, c2, c0, 1 @ TTB 1
243 mcr p15, 0, ip, c2, c0, 2 @ TTB control register
244 mcr p15, 0, r10, c1, c0, 1 @ Auxiliary control register
245 mcr p15, 0, r11, c1, c0, 2 @ Co-processor access control
246 ldr r4, =PRRR @ PRRR
247 ldr r5, =NMRR @ NMRR
248 mcr p15, 0, r4, c10, c2, 0 @ write PRRR
249 mcr p15, 0, r5, c10, c2, 1 @ write NMRR
250 isb
251 mov r0, r9 @ control register
252 mov r2, r7, lsr #14 @ get TTB0 base
253 mov r2, r2, lsl #14
254 ldr r3, cpu_resume_l1_flags
255 b cpu_resume_mmu
256 ENDPROC(cpu_v7_do_resume)
257 cpu_resume_l1_flags:
258 ALT_SMP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_SMP)
259 ALT_UP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_UP)
260 #else
261 #define cpu_v7_do_suspend 0
262 #define cpu_v7_do_resume 0
263 #endif
265 __CPUINIT
267 /*
268 * __v7_setup
269 *
270 * Initialise TLB, Caches, and MMU state ready to switch the MMU
271 * on. Return in r0 the new CP15 C1 control register setting.
272 *
273 * We automatically detect if we have a Harvard cache, and use the
274 * Harvard cache control instructions insead of the unified cache
275 * control instructions.
276 *
277 * This should be able to cover all ARMv7 cores.
278 *
279 * It is assumed that:
280 * - cache type register is implemented
281 */
282 __v7_ca9mp_setup:
283 #ifdef CONFIG_SMP
284 ALT_SMP(mrc p15, 0, r0, c1, c0, 1)
285 ALT_UP(mov r0, #(1 << 6)) @ fake it for UP
286 tst r0, #(1 << 6) @ SMP/nAMP mode enabled?
287 orreq r0, r0, #(1 << 6) | (1 << 0) @ Enable SMP/nAMP mode and
288 mcreq p15, 0, r0, c1, c0, 1 @ TLB ops broadcasting
289 #endif
290 __v7_setup:
291 adr r12, __v7_setup_stack @ the local stack
292 stmia r12, {r0-r5, r7, r9, r11, lr}
293 bl v7_flush_dcache_all
294 ldmia r12, {r0-r5, r7, r9, r11, lr}
296 mrc p15, 0, r0, c0, c0, 0 @ read main ID register
297 and r10, r0, #0xff000000 @ ARM?
298 teq r10, #0x41000000
299 bne 3f
300 and r5, r0, #0x00f00000 @ variant
301 and r6, r0, #0x0000000f @ revision
302 orr r6, r6, r5, lsr #20-4 @ combine variant and revision
303 ubfx r0, r0, #4, #12 @ primary part number
305 /* Cortex-A8 Errata */
306 ldr r10, =0x00000c08 @ Cortex-A8 primary part number
307 teq r0, r10
308 bne 2f
309 #ifdef CONFIG_ARM_ERRATA_430973
310 teq r5, #0x00100000 @ only present in r1p*
311 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
312 orreq r10, r10, #(1 << 6) @ set IBE to 1
313 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
314 #endif
315 #ifdef CONFIG_ARM_ERRATA_458693
316 teq r6, #0x20 @ only present in r2p0
317 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
318 orreq r10, r10, #(1 << 5) @ set L1NEON to 1
319 orreq r10, r10, #(1 << 9) @ set PLDNOP to 1
320 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
321 #endif
322 #ifdef CONFIG_ARM_ERRATA_460075
323 teq r6, #0x20 @ only present in r2p0
324 mrceq p15, 1, r10, c9, c0, 2 @ read L2 cache aux ctrl register
325 tsteq r10, #1 << 22
326 orreq r10, r10, #(1 << 22) @ set the Write Allocate disable bit
327 mcreq p15, 1, r10, c9, c0, 2 @ write the L2 cache aux ctrl register
328 #endif
329 b 3f
331 /* Cortex-A9 Errata */
332 2: ldr r10, =0x00000c09 @ Cortex-A9 primary part number
333 teq r0, r10
334 bne 3f
335 #ifdef CONFIG_ARM_ERRATA_742230
336 cmp r6, #0x22 @ only present up to r2p2
337 mrcle p15, 0, r10, c15, c0, 1 @ read diagnostic register
338 orrle r10, r10, #1 << 4 @ set bit #4
339 mcrle p15, 0, r10, c15, c0, 1 @ write diagnostic register
340 #endif
341 #ifdef CONFIG_ARM_ERRATA_742231
342 teq r6, #0x20 @ present in r2p0
343 teqne r6, #0x21 @ present in r2p1
344 teqne r6, #0x22 @ present in r2p2
345 mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
346 orreq r10, r10, #1 << 12 @ set bit #12
347 orreq r10, r10, #1 << 22 @ set bit #22
348 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
349 #endif
350 #ifdef CONFIG_ARM_ERRATA_743622
351 teq r6, #0x20 @ present in r2p0
352 teqne r6, #0x21 @ present in r2p1
353 teqne r6, #0x22 @ present in r2p2
354 mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
355 orreq r10, r10, #1 << 6 @ set bit #6
356 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
357 #endif
358 #ifdef CONFIG_ARM_ERRATA_751472
359 cmp r6, #0x30 @ present prior to r3p0
360 mrclt p15, 0, r10, c15, c0, 1 @ read diagnostic register
361 orrlt r10, r10, #1 << 11 @ set bit #11
362 mcrlt p15, 0, r10, c15, c0, 1 @ write diagnostic register
363 #endif
365 3: mov r10, #0
366 #ifdef HARVARD_CACHE
367 mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate
368 #endif
369 dsb
370 #ifdef CONFIG_MMU
371 mcr p15, 0, r10, c8, c7, 0 @ invalidate I + D TLBs
372 mcr p15, 0, r10, c2, c0, 2 @ TTB control register
373 ALT_SMP(orr r4, r4, #TTB_FLAGS_SMP)
374 ALT_UP(orr r4, r4, #TTB_FLAGS_UP)
375 ALT_SMP(orr r8, r8, #TTB_FLAGS_SMP)
376 ALT_UP(orr r8, r8, #TTB_FLAGS_UP)
377 mcr p15, 0, r8, c2, c0, 1 @ load TTB1
378 ldr r5, =PRRR @ PRRR
379 ldr r6, =NMRR @ NMRR
380 mcr p15, 0, r5, c10, c2, 0 @ write PRRR
381 mcr p15, 0, r6, c10, c2, 1 @ write NMRR
382 #endif
383 adr r5, v7_crval
384 ldmia r5, {r5, r6}
385 #ifdef CONFIG_CPU_ENDIAN_BE8
386 orr r6, r6, #1 << 25 @ big-endian page tables
387 #endif
388 #ifdef CONFIG_SWP_EMULATE
389 orr r5, r5, #(1 << 10) @ set SW bit in "clear"
390 bic r6, r6, #(1 << 10) @ clear it in "mmuset"
391 #endif
392 mrc p15, 0, r0, c1, c0, 0 @ read control register
393 bic r0, r0, r5 @ clear bits them
394 orr r0, r0, r6 @ set them
395 THUMB( orr r0, r0, #1 << 30 ) @ Thumb exceptions
396 mov pc, lr @ return to head.S:__ret
397 ENDPROC(__v7_setup)
399 /* AT
400 * TFR EV X F I D LR S
401 * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
402 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
403 * 1 0 110 0011 1100 .111 1101 < we want
404 */
405 .type v7_crval, #object
406 v7_crval:
407 crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c
409 __v7_setup_stack:
410 .space 4 * 11 @ 11 registers
412 __INITDATA
414 .type v7_processor_functions, #object
415 ENTRY(v7_processor_functions)
416 .word v7_early_abort
417 .word v7_pabort
418 .word cpu_v7_proc_init
419 .word cpu_v7_proc_fin
420 .word cpu_v7_reset
421 .word cpu_v7_do_idle
422 .word cpu_v7_dcache_clean_area
423 .word cpu_v7_switch_mm
424 .word cpu_v7_set_pte_ext
425 .word cpu_v7_suspend_size
426 .word cpu_v7_do_suspend
427 .word cpu_v7_do_resume
428 .size v7_processor_functions, . - v7_processor_functions
430 .section ".rodata"
432 .type cpu_arch_name, #object
433 cpu_arch_name:
434 .asciz "armv7"
435 .size cpu_arch_name, . - cpu_arch_name
437 .type cpu_elf_name, #object
438 cpu_elf_name:
439 .asciz "v7"
440 .size cpu_elf_name, . - cpu_elf_name
441 .align
443 .section ".proc.info.init", #alloc, #execinstr
445 .type __v7_ca9mp_proc_info, #object
446 __v7_ca9mp_proc_info:
447 .long 0x410fc090 @ Required ID value
448 .long 0xff0ffff0 @ Mask for ID
449 ALT_SMP(.long \
450 PMD_TYPE_SECT | \
451 PMD_SECT_AP_WRITE | \
452 PMD_SECT_AP_READ | \
453 PMD_FLAGS_SMP)
454 ALT_UP(.long \
455 PMD_TYPE_SECT | \
456 PMD_SECT_AP_WRITE | \
457 PMD_SECT_AP_READ | \
458 PMD_FLAGS_UP)
459 .long PMD_TYPE_SECT | \
460 PMD_SECT_XN | \
461 PMD_SECT_AP_WRITE | \
462 PMD_SECT_AP_READ
463 W(b) __v7_ca9mp_setup
464 .long cpu_arch_name
465 .long cpu_elf_name
466 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_TLS
467 .long cpu_v7_name
468 .long v7_processor_functions
469 .long v7wbi_tlb_fns
470 .long v6_user_fns
471 .long v7_cache_fns
472 .size __v7_ca9mp_proc_info, . - __v7_ca9mp_proc_info
474 /*
475 * Match any ARMv7 processor core.
476 */
477 .type __v7_proc_info, #object
478 __v7_proc_info:
479 .long 0x000f0000 @ Required ID value
480 .long 0x000f0000 @ Mask for ID
481 ALT_SMP(.long \
482 PMD_TYPE_SECT | \
483 PMD_SECT_AP_WRITE | \
484 PMD_SECT_AP_READ | \
485 PMD_FLAGS_SMP)
486 ALT_UP(.long \
487 PMD_TYPE_SECT | \
488 PMD_SECT_AP_WRITE | \
489 PMD_SECT_AP_READ | \
490 PMD_FLAGS_UP)
491 .long PMD_TYPE_SECT | \
492 PMD_SECT_XN | \
493 PMD_SECT_AP_WRITE | \
494 PMD_SECT_AP_READ
495 W(b) __v7_setup
496 .long cpu_arch_name
497 .long cpu_elf_name
498 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_TLS
499 .long cpu_v7_name
500 .long v7_processor_functions
501 .long v7wbi_tlb_fns
502 .long v6_user_fns
503 .long v7_cache_fns
504 .size __v7_proc_info, . - __v7_proc_info