2 * linux/arch/arm/mm/proc-v7.S
4 * Copyright (C) 2001 Deep Blue Solutions Ltd.
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.
10 * This is the "shell" of the ARMv7 processor support.
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)
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
51 ENDPROC(cpu_v7_proc_fin)
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.
60 * - loc - location to jump to for soft reset
62 * This code must be executed using a flat identity mapping with
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
78 * Idle the processor (eg, wait for interrupt).
80 * IRQs are already disabled.
83 dsb @ WFI may enter a low-power mode
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
98 ENDPROC(cpu_v7_dcache_clean_area)
101 * cpu_v7_switch_mm(pgd_phys, tsk)
103 * Set the translation table base pointer to be pgd_phys
105 * - pgd_phys - physical address of new TTB
107 * It is assumed that:
108 * - we are not using split page tables
110 ENTRY(cpu_v7_switch_mm)
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
119 #ifdef CONFIG_ARM_ERRATA_754322
122 mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID
124 1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
126 #ifdef CONFIG_ARM_ERRATA_754322
129 mcr p15, 0, r1, c13, c0, 1 @ set context ID
133 ENDPROC(cpu_v7_switch_mm)
136 * cpu_v7_set_pte_ext(ptep, pte)
138 * Set a level 2 translation table entry.
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
145 ENTRY(cpu_v7_set_pte_ext)
147 str r1, [r0] @ linux version
149 bic r3, r1, #0x000003f0
150 bic r3, r3, #PTE_TYPE_MASK
152 orr r3, r3, #PTE_EXT_AP0 | 2
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
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
170 orrne r3, r3, #PTE_EXT_XN
173 tstne r1, #L_PTE_PRESENT
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
182 ENDPROC(cpu_v7_set_pte_ext)
184 string cpu_v7_name, "ARMv7 Processor"
188 * Memory region attributes with SCTLR.TRE=1
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
197 * BUFFERABLE 001 10 00 00
198 * WRITETHROUGH 010 10 10 10
199 * WRITEBACK 011 10 11 11
201 * WRITEALLOC 111 10 01 01
203 * DEV_NONSHARED 100 01
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
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 * 7
221 #ifdef CONFIG_ARM_CPU_SUSPEND
222 ENTRY(cpu_v7_do_suspend)
223 stmfd sp!, {r4 - r10, lr}
224 mrc p15, 0, r4, c13, c0, 0 @ FCSE/PID
225 mrc p15, 0, r5, c13, c0, 3 @ User r/o thread ID
227 mrc p15, 0, r6, c3, c0, 0 @ Domain ID
228 mrc p15, 0, r7, c2, c0, 1 @ TTB 1
229 mrc p15, 0, r8, c1, c0, 0 @ Control register
230 mrc p15, 0, r9, c1, c0, 1 @ Auxiliary control register
231 mrc p15, 0, r10, c1, c0, 2 @ Co-processor access control
233 ldmfd sp!, {r4 - r10, pc}
234 ENDPROC(cpu_v7_do_suspend)
236 ENTRY(cpu_v7_do_resume)
238 mcr p15, 0, ip, c8, c7, 0 @ invalidate TLBs
239 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
240 mcr p15, 0, ip, c13, c0, 1 @ set reserved context ID
242 mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID
243 mcr p15, 0, r5, c13, c0, 3 @ User r/o thread ID
245 mcr p15, 0, r6, c3, c0, 0 @ Domain ID
246 ALT_SMP(orr r1, r1, #TTB_FLAGS_SMP)
247 ALT_UP(orr r1, r1, #TTB_FLAGS_UP)
248 mcr p15, 0, r1, c2, c0, 0 @ TTB 0
249 mcr p15, 0, r7, 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, r9 @ Is it already set?
253 mcrne p15, 0, r9, c1, c0, 1 @ No, so write it
254 mcr p15, 0, r10, c1, c0, 2 @ Co-processor access control
257 mcr p15, 0, r4, c10, c2, 0 @ write PRRR
258 mcr p15, 0, r5, c10, c2, 1 @ write NMRR
261 mov r0, r8 @ control register
263 ENDPROC(cpu_v7_do_resume)
271 * Initialise TLB, Caches, and MMU state ready to switch the MMU
272 * on. Return in r0 the new CP15 C1 control register setting.
274 * We automatically detect if we have a Harvard cache, and use the
275 * Harvard cache control instructions insead of the unified cache
276 * control instructions.
278 * This should be able to cover all ARMv7 cores.
280 * It is assumed that:
281 * - cache type register is implemented
285 mov r10, #(1 << 0) @ TLB ops broadcasting
291 ALT_SMP(mrc p15, 0, r0, c1, c0, 1)
292 ALT_UP(mov r0, #(1 << 6)) @ fake it for UP
293 tst r0, #(1 << 6) @ SMP/nAMP mode enabled?
294 orreq r0, r0, #(1 << 6) @ Enable SMP/nAMP mode
295 orreq r0, r0, r10 @ Enable CPU-specific SMP bits
296 mcreq p15, 0, r0, c1, c0, 1
299 adr r12, __v7_setup_stack @ the local stack
300 stmia r12, {r0-r5, r7, r9, r11, lr}
301 bl v7_flush_dcache_all
302 ldmia r12, {r0-r5, r7, r9, r11, lr}
304 mrc p15, 0, r0, c0, c0, 0 @ read main ID register
305 and r10, r0, #0xff000000 @ ARM?
308 and r5, r0, #0x00f00000 @ variant
309 and r6, r0, #0x0000000f @ revision
310 orr r6, r6, r5, lsr #20-4 @ combine variant and revision
311 ubfx r0, r0, #4, #12 @ primary part number
313 /* Cortex-A8 Errata */
314 ldr r10, =0x00000c08 @ Cortex-A8 primary part number
317 #ifdef CONFIG_ARM_ERRATA_430973
318 teq r5, #0x00100000 @ only present in r1p*
319 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
320 orreq r10, r10, #(1 << 6) @ set IBE to 1
321 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
323 #ifdef CONFIG_ARM_ERRATA_458693
324 teq r6, #0x20 @ only present in r2p0
325 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
326 orreq r10, r10, #(1 << 5) @ set L1NEON to 1
327 orreq r10, r10, #(1 << 9) @ set PLDNOP to 1
328 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
330 #ifdef CONFIG_ARM_ERRATA_460075
331 teq r6, #0x20 @ only present in r2p0
332 mrceq p15, 1, r10, c9, c0, 2 @ read L2 cache aux ctrl register
334 orreq r10, r10, #(1 << 22) @ set the Write Allocate disable bit
335 mcreq p15, 1, r10, c9, c0, 2 @ write the L2 cache aux ctrl register
339 /* Cortex-A9 Errata */
340 2: ldr r10, =0x00000c09 @ Cortex-A9 primary part number
343 #ifdef CONFIG_ARM_ERRATA_742230
344 cmp r6, #0x22 @ only present up to r2p2
345 mrcle p15, 0, r10, c15, c0, 1 @ read diagnostic register
346 orrle r10, r10, #1 << 4 @ set bit #4
347 mcrle p15, 0, r10, c15, c0, 1 @ write diagnostic register
349 #ifdef CONFIG_ARM_ERRATA_742231
350 teq r6, #0x20 @ present in r2p0
351 teqne r6, #0x21 @ present in r2p1
352 teqne r6, #0x22 @ present in r2p2
353 mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
354 orreq r10, r10, #1 << 12 @ set bit #12
355 orreq r10, r10, #1 << 22 @ set bit #22
356 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
358 #ifdef CONFIG_ARM_ERRATA_743622
359 teq r6, #0x20 @ present in r2p0
360 teqne r6, #0x21 @ present in r2p1
361 teqne r6, #0x22 @ present in r2p2
362 mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
363 orreq r10, r10, #1 << 6 @ set bit #6
364 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
366 #ifdef CONFIG_ARM_ERRATA_751472
367 cmp r6, #0x30 @ present prior to r3p0
368 mrclt p15, 0, r10, c15, c0, 1 @ read diagnostic register
369 orrlt r10, r10, #1 << 11 @ set bit #11
370 mcrlt p15, 0, r10, c15, c0, 1 @ write diagnostic register
375 mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate
379 mcr p15, 0, r10, c8, c7, 0 @ invalidate I + D TLBs
380 mcr p15, 0, r10, c2, c0, 2 @ TTB control register
381 ALT_SMP(orr r4, r4, #TTB_FLAGS_SMP)
382 ALT_UP(orr r4, r4, #TTB_FLAGS_UP)
383 ALT_SMP(orr r8, r8, #TTB_FLAGS_SMP)
384 ALT_UP(orr r8, r8, #TTB_FLAGS_UP)
385 mcr p15, 0, r8, c2, c0, 1 @ load TTB1
388 mcr p15, 0, r5, c10, c2, 0 @ write PRRR
389 mcr p15, 0, r6, c10, c2, 1 @ write NMRR
393 #ifdef CONFIG_CPU_ENDIAN_BE8
394 orr r6, r6, #1 << 25 @ big-endian page tables
396 #ifdef CONFIG_SWP_EMULATE
397 orr r5, r5, #(1 << 10) @ set SW bit in "clear"
398 bic r6, r6, #(1 << 10) @ clear it in "mmuset"
400 mrc p15, 0, r0, c1, c0, 0 @ read control register
401 bic r0, r0, r5 @ clear bits them
402 orr r0, r0, r6 @ set them
403 THUMB( orr r0, r0, #1 << 30 ) @ Thumb exceptions
404 mov pc, lr @ return to head.S:__ret
408 * TFR EV X F I D LR S
409 * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
410 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
411 * 1 0 110 0011 1100 .111 1101 < we want
413 .type v7_crval, #object
415 crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c
418 .space 4 * 11 @ 11 registers
422 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
423 define_processor_functions v7, dabort=v7_early_abort, pabort=v7_pabort, suspend=1
427 string cpu_arch_name, "armv7"
428 string cpu_elf_name, "v7"
431 .section ".proc.info.init", #alloc, #execinstr
434 * Standard v7 proc info content
436 .macro __v7_proc initfunc, mm_mmuflags = 0, io_mmuflags = 0, hwcaps = 0
437 ALT_SMP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | \
438 PMD_FLAGS_SMP | \mm_mmuflags)
439 ALT_UP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | \
440 PMD_FLAGS_UP | \mm_mmuflags)
441 .long PMD_TYPE_SECT | PMD_SECT_XN | PMD_SECT_AP_WRITE | \
442 PMD_SECT_AP_READ | \io_mmuflags
446 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_FAST_MULT | \
447 HWCAP_EDSP | HWCAP_TLS | \hwcaps
449 .long v7_processor_functions
456 * ARM Ltd. Cortex A5 processor.
458 .type __v7_ca5mp_proc_info, #object
459 __v7_ca5mp_proc_info:
462 __v7_proc __v7_ca5mp_setup
463 .size __v7_ca5mp_proc_info, . - __v7_ca5mp_proc_info
466 * ARM Ltd. Cortex A9 processor.
468 .type __v7_ca9mp_proc_info, #object
469 __v7_ca9mp_proc_info:
472 __v7_proc __v7_ca9mp_setup
473 .size __v7_ca9mp_proc_info, . - __v7_ca9mp_proc_info
476 * ARM Ltd. Cortex A15 processor.
478 .type __v7_ca15mp_proc_info, #object
479 __v7_ca15mp_proc_info:
482 __v7_proc __v7_ca15mp_setup, hwcaps = HWCAP_IDIV
483 .size __v7_ca15mp_proc_info, . - __v7_ca15mp_proc_info
486 * Match any ARMv7 processor core.
488 .type __v7_proc_info, #object
490 .long 0x000f0000 @ Required ID value
491 .long 0x000f0000 @ Mask for ID
493 .size __v7_proc_info, . - __v7_proc_info