| blob | 9591c8e9fb8cc5db7d0668c62fcbfa40d9527f0b |
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 * This code must be executed using a flat identity mapping with
63 * caches disabled.
64 */
65 .align 5
66 ENTRY(cpu_v7_reset)
67 mrc p15, 0, r1, c1, c0, 0 @ ctrl register
68 bic r1, r1, #0x1 @ ...............m
69 THUMB( bic r1, r1, #1 << 30 ) @ SCTLR.TE (Thumb exceptions)
70 mcr p15, 0, r1, c1, c0, 0 @ disable MMU
71 isb
72 mov pc, r0
73 ENDPROC(cpu_v7_reset)
75 /*
76 * cpu_v7_do_idle()
77 *
78 * Idle the processor (eg, wait for interrupt).
79 *
80 * IRQs are already disabled.
81 */
82 ENTRY(cpu_v7_do_idle)
83 dsb @ WFI may enter a low-power mode
84 wfi
85 mov pc, lr
86 ENDPROC(cpu_v7_do_idle)
88 ENTRY(cpu_v7_dcache_clean_area)
89 #ifndef TLB_CAN_READ_FROM_L1_CACHE
90 dcache_line_size r2, r3
91 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
92 add r0, r0, r2
93 subs r1, r1, r2
94 bhi 1b
95 dsb
96 #endif
97 mov pc, lr
98 ENDPROC(cpu_v7_dcache_clean_area)
100 /*
101 * cpu_v7_switch_mm(pgd_phys, tsk)
102 *
103 * Set the translation table base pointer to be pgd_phys
104 *
105 * - pgd_phys - physical address of new TTB
106 *
107 * It is assumed that:
108 * - we are not using split page tables
109 */
110 ENTRY(cpu_v7_switch_mm)
111 #ifdef CONFIG_MMU
112 mov r2, #0
113 ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id
114 ALT_SMP(orr r0, r0, #TTB_FLAGS_SMP)
115 ALT_UP(orr r0, r0, #TTB_FLAGS_UP)
116 #ifdef CONFIG_ARM_ERRATA_430973
117 mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB
118 #endif
119 #ifdef CONFIG_ARM_ERRATA_754322
120 dsb
121 #endif
122 mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID
123 isb
124 1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
125 isb
126 #ifdef CONFIG_ARM_ERRATA_754322
127 dsb
128 #endif
129 mcr p15, 0, r1, c13, c0, 1 @ set context ID
130 isb
131 #endif
132 mov pc, lr
133 ENDPROC(cpu_v7_switch_mm)
135 /*
136 * cpu_v7_set_pte_ext(ptep, pte)
137 *
138 * Set a level 2 translation table entry.
139 *
140 * - ptep - pointer to level 2 translation table entry
141 * (hardware version is stored at +2048 bytes)
142 * - pte - PTE value to store
143 * - ext - value for extended PTE bits
144 */
145 ENTRY(cpu_v7_set_pte_ext)
146 #ifdef CONFIG_MMU
147 str r1, [r0] @ linux version
149 bic r3, r1, #0x000003f0
150 bic r3, r3, #PTE_TYPE_MASK
151 orr r3, r3, r2
152 orr r3, r3, #PTE_EXT_AP0 | 2
154 tst r1, #1 << 4
155 orrne r3, r3, #PTE_EXT_TEX(1)
157 eor r1, r1, #L_PTE_DIRTY
158 tst r1, #L_PTE_RDONLY | L_PTE_DIRTY
159 orrne r3, r3, #PTE_EXT_APX
161 tst r1, #L_PTE_USER
162 orrne r3, r3, #PTE_EXT_AP1
163 #ifdef CONFIG_CPU_USE_DOMAINS
164 @ allow kernel read/write access to read-only user pages
165 tstne r3, #PTE_EXT_APX
166 bicne r3, r3, #PTE_EXT_APX | PTE_EXT_AP0
167 #endif
169 tst r1, #L_PTE_XN
170 orrne r3, r3, #PTE_EXT_XN
172 tst r1, #L_PTE_YOUNG
173 tstne r1, #L_PTE_PRESENT
174 moveq r3, #0
176 ARM( str r3, [r0, #2048]! )
177 THUMB( add r0, r0, #2048 )
178 THUMB( str r3, [r0] )
179 mcr p15, 0, r0, c7, c10, 1 @ flush_pte
180 #endif
181 mov pc, lr
182 ENDPROC(cpu_v7_set_pte_ext)
184 string cpu_v7_name, "ARMv7 Processor"
185 .align
187 /*
188 * Memory region attributes with SCTLR.TRE=1
189 *
190 * n = TEX[0],C,B
191 * TR = PRRR[2n+1:2n] - memory type
192 * IR = NMRR[2n+1:2n] - inner cacheable property
193 * OR = NMRR[2n+17:2n+16] - outer cacheable property
194 *
195 * n TR IR OR
196 * UNCACHED 000 00
197 * BUFFERABLE 001 10 00 00
198 * WRITETHROUGH 010 10 10 10
199 * WRITEBACK 011 10 11 11
200 * reserved 110
201 * WRITEALLOC 111 10 01 01
202 * DEV_SHARED 100 01
203 * DEV_NONSHARED 100 01
204 * DEV_WC 001 10
205 * DEV_CACHED 011 10
206 *
207 * Other attributes:
208 *
209 * DS0 = PRRR[16] = 0 - device shareable property
210 * DS1 = PRRR[17] = 1 - device shareable property
211 * NS0 = PRRR[18] = 0 - normal shareable property
212 * NS1 = PRRR[19] = 1 - normal shareable property
213 * NOS = PRRR[24+n] = 1 - not outer shareable
214 */
215 .equ PRRR, 0xff0a81a8
216 .equ NMRR, 0x40e040e0
218 /* Suspend/resume support: derived from arch/arm/mach-s5pv210/sleep.S */
219 .globl cpu_v7_suspend_size
220 .equ cpu_v7_suspend_size, 4 * 9
221 #ifdef CONFIG_ARM_CPU_SUSPEND
222 ENTRY(cpu_v7_do_suspend)
223 stmfd sp!, {r4 - r11, lr}
224 mrc p15, 0, r4, c13, c0, 0 @ FCSE/PID
225 mrc p15, 0, r5, c13, c0, 1 @ Context ID
226 mrc p15, 0, r6, c13, c0, 3 @ User r/o thread ID
227 stmia r0!, {r4 - r6}
228 mrc p15, 0, r6, c3, c0, 0 @ Domain ID
229 mrc p15, 0, r7, c2, c0, 0 @ TTB 0
230 mrc p15, 0, r8, c2, c0, 1 @ TTB 1
231 mrc p15, 0, r9, c1, c0, 0 @ Control register
232 mrc p15, 0, r10, c1, c0, 1 @ Auxiliary control register
233 mrc p15, 0, r11, c1, c0, 2 @ Co-processor access control
234 stmia r0, {r6 - r11}
235 ldmfd sp!, {r4 - r11, pc}
236 ENDPROC(cpu_v7_do_suspend)
238 ENTRY(cpu_v7_do_resume)
239 mov ip, #0
240 mcr p15, 0, ip, c8, c7, 0 @ invalidate TLBs
241 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
242 ldmia r0!, {r4 - r6}
243 mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID
244 mcr p15, 0, r5, c13, c0, 1 @ Context ID
245 mcr p15, 0, r6, c13, c0, 3 @ User r/o thread ID
246 ldmia r0, {r6 - r11}
247 mcr p15, 0, r6, c3, c0, 0 @ Domain ID
248 mcr p15, 0, r7, c2, c0, 0 @ TTB 0
249 mcr p15, 0, r8, c2, c0, 1 @ TTB 1
250 mcr p15, 0, ip, c2, c0, 2 @ TTB control register
251 mrc p15, 0, r4, c1, c0, 1 @ Read Auxiliary control register
252 teq r4, r10 @ Is it already set?
253 mcrne p15, 0, r10, c1, c0, 1 @ No, so write it
254 mcr p15, 0, r11, c1, c0, 2 @ Co-processor access control
255 ldr r4, =PRRR @ PRRR
256 ldr r5, =NMRR @ NMRR
257 mcr p15, 0, r4, c10, c2, 0 @ write PRRR
258 mcr p15, 0, r5, c10, c2, 1 @ write NMRR
259 isb
260 dsb
261 mov r0, r9 @ control register
262 mov r2, r7, lsr #14 @ get TTB0 base
263 mov r2, r2, lsl #14
264 ldr r3, cpu_resume_l1_flags
265 b cpu_resume_mmu
266 ENDPROC(cpu_v7_do_resume)
267 cpu_resume_l1_flags:
268 ALT_SMP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_SMP)
269 ALT_UP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_UP)
270 #endif
272 __CPUINIT
274 /*
275 * __v7_setup
276 *
277 * Initialise TLB, Caches, and MMU state ready to switch the MMU
278 * on. Return in r0 the new CP15 C1 control register setting.
279 *
280 * We automatically detect if we have a Harvard cache, and use the
281 * Harvard cache control instructions insead of the unified cache
282 * control instructions.
283 *
284 * This should be able to cover all ARMv7 cores.
285 *
286 * It is assumed that:
287 * - cache type register is implemented
288 */
289 __v7_ca5mp_setup:
290 __v7_ca9mp_setup:
291 mov r10, #(1 << 0) @ TLB ops broadcasting
292 b 1f
293 __v7_ca15mp_setup:
294 mov r10, #0
295 1:
296 #ifdef CONFIG_SMP
297 ALT_SMP(mrc p15, 0, r0, c1, c0, 1)
298 ALT_UP(mov r0, #(1 << 6)) @ fake it for UP
299 tst r0, #(1 << 6) @ SMP/nAMP mode enabled?
300 orreq r0, r0, #(1 << 6) @ Enable SMP/nAMP mode
301 orreq r0, r0, r10 @ Enable CPU-specific SMP bits
302 mcreq p15, 0, r0, c1, c0, 1
303 #endif
304 __v7_setup:
305 adr r12, __v7_setup_stack @ the local stack
306 stmia r12, {r0-r5, r7, r9, r11, lr}
307 bl v7_flush_dcache_all
308 ldmia r12, {r0-r5, r7, r9, r11, lr}
310 mrc p15, 0, r0, c0, c0, 0 @ read main ID register
311 and r10, r0, #0xff000000 @ ARM?
312 teq r10, #0x41000000
313 bne 3f
314 and r5, r0, #0x00f00000 @ variant
315 and r6, r0, #0x0000000f @ revision
316 orr r6, r6, r5, lsr #20-4 @ combine variant and revision
317 ubfx r0, r0, #4, #12 @ primary part number
319 /* Cortex-A8 Errata */
320 ldr r10, =0x00000c08 @ Cortex-A8 primary part number
321 teq r0, r10
322 bne 2f
323 #ifdef CONFIG_ARM_ERRATA_430973
324 teq r5, #0x00100000 @ only present in r1p*
325 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
326 orreq r10, r10, #(1 << 6) @ set IBE to 1
327 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
328 #endif
329 #ifdef CONFIG_ARM_ERRATA_458693
330 teq r6, #0x20 @ only present in r2p0
331 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
332 orreq r10, r10, #(1 << 5) @ set L1NEON to 1
333 orreq r10, r10, #(1 << 9) @ set PLDNOP to 1
334 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
335 #endif
336 #ifdef CONFIG_ARM_ERRATA_460075
337 teq r6, #0x20 @ only present in r2p0
338 mrceq p15, 1, r10, c9, c0, 2 @ read L2 cache aux ctrl register
339 tsteq r10, #1 << 22
340 orreq r10, r10, #(1 << 22) @ set the Write Allocate disable bit
341 mcreq p15, 1, r10, c9, c0, 2 @ write the L2 cache aux ctrl register
342 #endif
343 b 3f
345 /* Cortex-A9 Errata */
346 2: ldr r10, =0x00000c09 @ Cortex-A9 primary part number
347 teq r0, r10
348 bne 3f
349 #ifdef CONFIG_ARM_ERRATA_742230
350 cmp r6, #0x22 @ only present up to r2p2
351 mrcle p15, 0, r10, c15, c0, 1 @ read diagnostic register
352 orrle r10, r10, #1 << 4 @ set bit #4
353 mcrle p15, 0, r10, c15, c0, 1 @ write diagnostic register
354 #endif
355 #ifdef CONFIG_ARM_ERRATA_742231
356 teq r6, #0x20 @ present in r2p0
357 teqne r6, #0x21 @ present in r2p1
358 teqne r6, #0x22 @ present in r2p2
359 mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
360 orreq r10, r10, #1 << 12 @ set bit #12
361 orreq r10, r10, #1 << 22 @ set bit #22
362 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
363 #endif
364 #ifdef CONFIG_ARM_ERRATA_743622
365 teq r6, #0x20 @ present in r2p0
366 teqne r6, #0x21 @ present in r2p1
367 teqne r6, #0x22 @ present in r2p2
368 mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
369 orreq r10, r10, #1 << 6 @ set bit #6
370 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
371 #endif
372 #ifdef CONFIG_ARM_ERRATA_751472
373 cmp r6, #0x30 @ present prior to r3p0
374 mrclt p15, 0, r10, c15, c0, 1 @ read diagnostic register
375 orrlt r10, r10, #1 << 11 @ set bit #11
376 mcrlt p15, 0, r10, c15, c0, 1 @ write diagnostic register
377 #endif
379 3: mov r10, #0
380 #ifdef HARVARD_CACHE
381 mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate
382 #endif
383 dsb
384 #ifdef CONFIG_MMU
385 mcr p15, 0, r10, c8, c7, 0 @ invalidate I + D TLBs
386 mcr p15, 0, r10, c2, c0, 2 @ TTB control register
387 ALT_SMP(orr r4, r4, #TTB_FLAGS_SMP)
388 ALT_UP(orr r4, r4, #TTB_FLAGS_UP)
389 ALT_SMP(orr r8, r8, #TTB_FLAGS_SMP)
390 ALT_UP(orr r8, r8, #TTB_FLAGS_UP)
391 mcr p15, 0, r8, c2, c0, 1 @ load TTB1
392 ldr r5, =PRRR @ PRRR
393 ldr r6, =NMRR @ NMRR
394 mcr p15, 0, r5, c10, c2, 0 @ write PRRR
395 mcr p15, 0, r6, c10, c2, 1 @ write NMRR
396 #endif
397 adr r5, v7_crval
398 ldmia r5, {r5, r6}
399 #ifdef CONFIG_CPU_ENDIAN_BE8
400 orr r6, r6, #1 << 25 @ big-endian page tables
401 #endif
402 #ifdef CONFIG_SWP_EMULATE
403 orr r5, r5, #(1 << 10) @ set SW bit in "clear"
404 bic r6, r6, #(1 << 10) @ clear it in "mmuset"
405 #endif
406 mrc p15, 0, r0, c1, c0, 0 @ read control register
407 bic r0, r0, r5 @ clear bits them
408 orr r0, r0, r6 @ set them
409 THUMB( orr r0, r0, #1 << 30 ) @ Thumb exceptions
410 mov pc, lr @ return to head.S:__ret
411 ENDPROC(__v7_setup)
413 /* AT
414 * TFR EV X F I D LR S
415 * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
416 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
417 * 1 0 110 0011 1100 .111 1101 < we want
418 */
419 .type v7_crval, #object
420 v7_crval:
421 crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c
423 __v7_setup_stack:
424 .space 4 * 11 @ 11 registers
426 __INITDATA
428 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
429 define_processor_functions v7, dabort=v7_early_abort, pabort=v7_pabort, suspend=1
431 .section ".rodata"
433 string cpu_arch_name, "armv7"
434 string cpu_elf_name, "v7"
435 .align
437 .section ".proc.info.init", #alloc, #execinstr
439 /*
440 * Standard v7 proc info content
441 */
442 .macro __v7_proc initfunc, mm_mmuflags = 0, io_mmuflags = 0, hwcaps = 0
443 ALT_SMP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | \
444 PMD_FLAGS_SMP | \mm_mmuflags)
445 ALT_UP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | \
446 PMD_FLAGS_UP | \mm_mmuflags)
447 .long PMD_TYPE_SECT | PMD_SECT_XN | PMD_SECT_AP_WRITE | \
448 PMD_SECT_AP_READ | \io_mmuflags
449 W(b) \initfunc
450 .long cpu_arch_name
451 .long cpu_elf_name
452 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_FAST_MULT | \
453 HWCAP_EDSP | HWCAP_TLS | \hwcaps
454 .long cpu_v7_name
455 .long v7_processor_functions
456 .long v7wbi_tlb_fns
457 .long v6_user_fns
458 .long v7_cache_fns
459 .endm
461 /*
462 * ARM Ltd. Cortex A5 processor.
463 */
464 .type __v7_ca5mp_proc_info, #object
465 __v7_ca5mp_proc_info:
466 .long 0x410fc050
467 .long 0xff0ffff0
468 __v7_proc __v7_ca5mp_setup
469 .size __v7_ca5mp_proc_info, . - __v7_ca5mp_proc_info
471 /*
472 * ARM Ltd. Cortex A9 processor.
473 */
474 .type __v7_ca9mp_proc_info, #object
475 __v7_ca9mp_proc_info:
476 .long 0x410fc090
477 .long 0xff0ffff0
478 __v7_proc __v7_ca9mp_setup
479 .size __v7_ca9mp_proc_info, . - __v7_ca9mp_proc_info
481 /*
482 * ARM Ltd. Cortex A15 processor.
483 */
484 .type __v7_ca15mp_proc_info, #object
485 __v7_ca15mp_proc_info:
486 .long 0x410fc0f0
487 .long 0xff0ffff0
488 __v7_proc __v7_ca15mp_setup, hwcaps = HWCAP_IDIV
489 .size __v7_ca15mp_proc_info, . - __v7_ca15mp_proc_info
491 /*
492 * Match any ARMv7 processor core.
493 */
494 .type __v7_proc_info, #object
495 __v7_proc_info:
496 .long 0x000f0000 @ Required ID value
497 .long 0x000f0000 @ Mask for ID
498 __v7_proc __v7_setup
499 .size __v7_proc_info, . - __v7_proc_info