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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 "hwcap.h"
15 #include "assembler.h"
16 #include <asm/asm-offsets.h>
17 #include <asm/pgtable-hwdef.h>
18 #include "pgtable.h"
19
20 #include "proc-macros.S"
21
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))
32
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
36
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
40
41 ENTRY(cpu_v7_proc_init)
42 mov pc, lr
43 ENDPROC(cpu_v7_proc_init)
44
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)
52
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)
66
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)
79
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)
91
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)
126
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
140
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
145
146 tst r1, #1 << 4
147 orrne r3, r3, #PTE_EXT_TEX(1)
148
149 eor r1, r1, #L_PTE_DIRTY
150 tst r1, #L_PTE_RDONLY | L_PTE_DIRTY
151 orrne r3, r3, #PTE_EXT_APX
152
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
160
161 tst r1, #L_PTE_XN
162 orrne r3, r3, #PTE_EXT_XN
163
164 tst r1, #L_PTE_YOUNG
165 tstne r1, #L_PTE_PRESENT
166 moveq r3, #0
167
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)
175
176 cpu_v7_name:
177 .ascii "ARMv7 Processor"
178 .align
179
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
210
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 * 8
214 #if 0
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, c3, c0, 0 @ Domain ID
220 mrc p15, 0, r7, c2, c0, 0 @ TTB 0
221 mrc p15, 0, r8, c2, c0, 1 @ TTB 1
222 mrc p15, 0, r9, c1, c0, 0 @ Control register
223 mrc p15, 0, r10, c1, c0, 1 @ Auxiliary control register
224 mrc p15, 0, r11, c1, c0, 2 @ Co-processor access control
225 stmia r0, {r4 - r11}
226 ldmfd sp!, {r4 - r11, pc}
227 ENDPROC(cpu_v7_do_suspend)
228
229 ENTRY(cpu_v7_do_resume)
230 mov ip, #0
231 mcr p15, 0, ip, c8, c7, 0 @ invalidate TLBs
232 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
233 ldmia r0, {r4 - r11}
234 mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID
235 mcr p15, 0, r5, c13, c0, 1 @ Context ID
236 mcr p15, 0, r6, c3, c0, 0 @ Domain ID
237 mcr p15, 0, r7, c2, c0, 0 @ TTB 0
238 mcr p15, 0, r8, c2, c0, 1 @ TTB 1
239 mcr p15, 0, ip, c2, c0, 2 @ TTB control register
240 mcr p15, 0, r10, c1, c0, 1 @ Auxiliary control register
241 mcr p15, 0, r11, c1, c0, 2 @ Co-processor access control
242 ldr r4, =PRRR @ PRRR
243 ldr r5, =NMRR @ NMRR
244 mcr p15, 0, r4, c10, c2, 0 @ write PRRR
245 mcr p15, 0, r5, c10, c2, 1 @ write NMRR
246 isb
247 mov r0, r9 @ control register
248 mov r2, r7, lsr #14 @ get TTB0 base
249 mov r2, r2, lsl #14
250 ldr r3, cpu_resume_l1_flags
251 b cpu_resume_mmu
252 ENDPROC(cpu_v7_do_resume)
253 cpu_resume_l1_flags:
254 ALT_SMP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_SMP)
255 ALT_UP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_UP)
256 #else
257 #define cpu_v7_do_suspend 0
258 #define cpu_v7_do_resume 0
259 #endif
260
261 __CPUINIT
262
263 /*
264 * __v7_setup
265 *
266 * Initialise TLB, Caches, and MMU state ready to switch the MMU
267 * on. Return in r0 the new CP15 C1 control register setting.
268 *
269 * We automatically detect if we have a Harvard cache, and use the
270 * Harvard cache control instructions insead of the unified cache
271 * control instructions.
272 *
273 * This should be able to cover all ARMv7 cores.
274 *
275 * It is assumed that:
276 * - cache type register is implemented
277 */
278 __v7_ca9mp_setup:
279 #ifdef CONFIG_SMP
280 ALT_SMP(mrc p15, 0, r0, c1, c0, 1)
281 ALT_UP(mov r0, #(1 << 6)) @ fake it for UP
282 tst r0, #(1 << 6) @ SMP/nAMP mode enabled?
283 orreq r0, r0, #(1 << 6) | (1 << 0) @ Enable SMP/nAMP mode and
284 mcreq p15, 0, r0, c1, c0, 1 @ TLB ops broadcasting
285 #endif
286 __v7_setup:
287 adr r12, __v7_setup_stack @ the local stack
288 stmia r12, {r0-r5, r7, r9, r11, lr}
289 bl v7_flush_dcache_all
290 ldmia r12, {r0-r5, r7, r9, r11, lr}
291
292 mrc p15, 0, r0, c0, c0, 0 @ read main ID register
293 and r10, r0, #0xff000000 @ ARM?
294 teq r10, #0x41000000
295 bne 3f
296 and r5, r0, #0x00f00000 @ variant
297 and r6, r0, #0x0000000f @ revision
298 orr r6, r6, r5, lsr #20-4 @ combine variant and revision
299 ubfx r0, r0, #4, #12 @ primary part number
300
301 /* Cortex-A8 Errata */
302 ldr r10, =0x00000c08 @ Cortex-A8 primary part number
303 teq r0, r10
304 bne 2f
305 #ifdef CONFIG_ARM_ERRATA_430973
306 teq r5, #0x00100000 @ only present in r1p*
307 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
308 orreq r10, r10, #(1 << 6) @ set IBE to 1
309 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
310 #endif
311 #ifdef CONFIG_ARM_ERRATA_458693
312 teq r6, #0x20 @ only present in r2p0
313 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
314 orreq r10, r10, #(1 << 5) @ set L1NEON to 1
315 orreq r10, r10, #(1 << 9) @ set PLDNOP to 1
316 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
317 #endif
318 #ifdef CONFIG_ARM_ERRATA_460075
319 teq r6, #0x20 @ only present in r2p0
320 mrceq p15, 1, r10, c9, c0, 2 @ read L2 cache aux ctrl register
321 tsteq r10, #1 << 22
322 orreq r10, r10, #(1 << 22) @ set the Write Allocate disable bit
323 mcreq p15, 1, r10, c9, c0, 2 @ write the L2 cache aux ctrl register
324 #endif
325 b 3f
326
327 /* Cortex-A9 Errata */
328 2: ldr r10, =0x00000c09 @ Cortex-A9 primary part number
329 teq r0, r10
330 bne 3f
331 #ifdef CONFIG_ARM_ERRATA_742230
332 cmp r6, #0x22 @ only present up to r2p2
333 mrcle p15, 0, r10, c15, c0, 1 @ read diagnostic register
334 orrle r10, r10, #1 << 4 @ set bit #4
335 mcrle p15, 0, r10, c15, c0, 1 @ write diagnostic register
336 #endif
337 #ifdef CONFIG_ARM_ERRATA_742231
338 teq r6, #0x20 @ present in r2p0
339 teqne r6, #0x21 @ present in r2p1
340 teqne r6, #0x22 @ present in r2p2
341 mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
342 orreq r10, r10, #1 << 12 @ set bit #12
343 orreq r10, r10, #1 << 22 @ set bit #22
344 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
345 #endif
346 #ifdef CONFIG_ARM_ERRATA_743622
347 teq r6, #0x20 @ present in r2p0
348 teqne r6, #0x21 @ present in r2p1
349 teqne r6, #0x22 @ present in r2p2
350 mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
351 orreq r10, r10, #1 << 6 @ set bit #6
352 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
353 #endif
354 #ifdef CONFIG_ARM_ERRATA_751472
355 cmp r6, #0x30 @ present prior to r3p0
356 mrclt p15, 0, r10, c15, c0, 1 @ read diagnostic register
357 orrlt r10, r10, #1 << 11 @ set bit #11
358 mcrlt p15, 0, r10, c15, c0, 1 @ write diagnostic register
359 #endif
360
361 3: mov r10, #0
362 #ifdef HARVARD_CACHE
363 mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate
364 #endif
365 dsb
366 #ifdef CONFIG_MMU
367 mcr p15, 0, r10, c8, c7, 0 @ invalidate I + D TLBs
368 mcr p15, 0, r10, c2, c0, 2 @ TTB control register
369 ALT_SMP(orr r4, r4, #TTB_FLAGS_SMP)
370 ALT_UP(orr r4, r4, #TTB_FLAGS_UP)
371 mcr p15, 0, r4, c2, c0, 1 @ load TTB1
372 ldr r5, =PRRR @ PRRR
373 ldr r6, =NMRR @ NMRR
374 mcr p15, 0, r5, c10, c2, 0 @ write PRRR
375 mcr p15, 0, r6, c10, c2, 1 @ write NMRR
376 #endif
377 adr r5, v7_crval
378 ldmia r5, {r5, r6}
379 #ifdef CONFIG_CPU_ENDIAN_BE8
380 orr r6, r6, #1 << 25 @ big-endian page tables
381 #endif
382 #ifdef CONFIG_SWP_EMULATE
383 orr r5, r5, #(1 << 10) @ set SW bit in "clear"
384 bic r6, r6, #(1 << 10) @ clear it in "mmuset"
385 #endif
386 mrc p15, 0, r0, c1, c0, 0 @ read control register
387 bic r0, r0, r5 @ clear bits them
388 orr r0, r0, r6 @ set them
389 THUMB( orr r0, r0, #1 << 30 ) @ Thumb exceptions
390 mov pc, lr @ return to head.S:__ret
391 ENDPROC(__v7_setup)
392
393 /* AT
394 * TFR EV X F I D LR S
395 * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
396 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
397 * 1 0 110 0011 1100 .111 1101 < we want
398 */
399 .type v7_crval, #object
400 v7_crval:
401 crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c
402
403 __v7_setup_stack:
404 .space 4 * 11 @ 11 registers
405
406 __INITDATA
407
408 .type v7_processor_functions, #object
409 ENTRY(v7_processor_functions)
410 .word v7_early_abort
411 .word v7_pabort
412 .word cpu_v7_proc_init
413 .word cpu_v7_proc_fin
414 .word cpu_v7_reset
415 .word cpu_v7_do_idle
416 .word cpu_v7_dcache_clean_area
417 .word cpu_v7_switch_mm
418 .word cpu_v7_set_pte_ext
419 .word 0
420 .word 0
421 .word 0
422 .size v7_processor_functions, . - v7_processor_functions
423
424 .section ".rodata"
425
426 .type cpu_arch_name, #object
427 cpu_arch_name:
428 .asciz "armv7"
429 .size cpu_arch_name, . - cpu_arch_name
430
431 .type cpu_elf_name, #object
432 cpu_elf_name:
433 .asciz "v7"
434 .size cpu_elf_name, . - cpu_elf_name
435 .align
436
437 .section ".proc.info.init", #alloc, #execinstr
438
439 .type __v7_ca9mp_proc_info, #object
440 __v7_ca9mp_proc_info:
441 .long 0x410fc090 @ Required ID value
442 .long 0xff0ffff0 @ Mask for ID
443 ALT_SMP(.long \
444 PMD_TYPE_SECT | \
445 PMD_SECT_AP_WRITE | \
446 PMD_SECT_AP_READ | \
447 PMD_FLAGS_SMP)
448 ALT_UP(.long \
449 PMD_TYPE_SECT | \
450 PMD_SECT_AP_WRITE | \
451 PMD_SECT_AP_READ | \
452 PMD_FLAGS_UP)
453 .long PMD_TYPE_SECT | \
454 PMD_SECT_XN | \
455 PMD_SECT_AP_WRITE | \
456 PMD_SECT_AP_READ
457 W(b) __v7_ca9mp_setup
458 .long cpu_arch_name
459 .long cpu_elf_name
460 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_TLS
461 .long cpu_v7_name
462 .long v7_processor_functions
463 .long v7wbi_tlb_fns
464 .long v6_user_fns
465 .long v7_cache_fns
466 .size __v7_ca9mp_proc_info, . - __v7_ca9mp_proc_info
467
468 /*
469 * Match any ARMv7 processor core.
470 */
471 .type __v7_proc_info, #object
472 __v7_proc_info:
473 .long 0x000f0000 @ Required ID value
474 .long 0x000f0000 @ Mask for ID
475 ALT_SMP(.long \
476 PMD_TYPE_SECT | \
477 PMD_SECT_AP_WRITE | \
478 PMD_SECT_AP_READ | \
479 PMD_FLAGS_SMP)
480 ALT_UP(.long \
481 PMD_TYPE_SECT | \
482 PMD_SECT_AP_WRITE | \
483 PMD_SECT_AP_READ | \
484 PMD_FLAGS_UP)
485 .long PMD_TYPE_SECT | \
486 PMD_SECT_XN | \
487 PMD_SECT_AP_WRITE | \
488 PMD_SECT_AP_READ
489 W(b) __v7_setup
490 .long cpu_arch_name
491 .long cpu_elf_name
492 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_TLS
493 .long cpu_v7_name
494 .long v7_processor_functions
495 .long v7wbi_tlb_fns
496 .long v6_user_fns
497 .long v7_cache_fns
498 .size __v7_proc_info, . - __v7_proc_info
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