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
66 .pushsection .idmap.text, "ax"
68 mrc p15, 0, r1, c1, c0, 0 @ ctrl register
69 bic r1, r1, #0x1 @ ...............m
70 THUMB( bic r1, r1, #1 << 30 ) @ SCTLR.TE (Thumb exceptions)
71 mcr p15, 0, r1, c1, c0, 0 @ disable MMU
80 * Idle the processor (eg, wait for interrupt).
82 * IRQs are already disabled.
85 dsb @ WFI may enter a low-power mode
88 ENDPROC(cpu_v7_do_idle)
90 ENTRY(cpu_v7_dcache_clean_area)
91 #ifndef TLB_CAN_READ_FROM_L1_CACHE
92 dcache_line_size r2, r3
93 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
100 ENDPROC(cpu_v7_dcache_clean_area)
103 * cpu_v7_switch_mm(pgd_phys, tsk)
105 * Set the translation table base pointer to be pgd_phys
107 * - pgd_phys - physical address of new TTB
109 * It is assumed that:
110 * - we are not using split page tables
112 ENTRY(cpu_v7_switch_mm)
115 ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id
116 ALT_SMP(orr r0, r0, #TTB_FLAGS_SMP)
117 ALT_UP(orr r0, r0, #TTB_FLAGS_UP)
118 #ifdef CONFIG_ARM_ERRATA_430973
119 mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB
121 #ifdef CONFIG_ARM_ERRATA_754322
124 mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID
126 1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
128 #ifdef CONFIG_ARM_ERRATA_754322
131 mcr p15, 0, r1, c13, c0, 1 @ set context ID
135 ENDPROC(cpu_v7_switch_mm)
138 * cpu_v7_set_pte_ext(ptep, pte)
140 * Set a level 2 translation table entry.
142 * - ptep - pointer to level 2 translation table entry
143 * (hardware version is stored at +2048 bytes)
144 * - pte - PTE value to store
145 * - ext - value for extended PTE bits
147 ENTRY(cpu_v7_set_pte_ext)
149 str r1, [r0] @ linux version
151 bic r3, r1, #0x000003f0
152 bic r3, r3, #PTE_TYPE_MASK
154 orr r3, r3, #PTE_EXT_AP0 | 2
157 orrne r3, r3, #PTE_EXT_TEX(1)
159 eor r1, r1, #L_PTE_DIRTY
160 tst r1, #L_PTE_RDONLY | L_PTE_DIRTY
161 orrne r3, r3, #PTE_EXT_APX
164 orrne r3, r3, #PTE_EXT_AP1
165 #ifdef CONFIG_CPU_USE_DOMAINS
166 @ allow kernel read/write access to read-only user pages
167 tstne r3, #PTE_EXT_APX
168 bicne r3, r3, #PTE_EXT_APX | PTE_EXT_AP0
172 orrne r3, r3, #PTE_EXT_XN
175 tstne r1, #L_PTE_PRESENT
178 ARM( str r3, [r0, #2048]! )
179 THUMB( add r0, r0, #2048 )
180 THUMB( str r3, [r0] )
181 mcr p15, 0, r0, c7, c10, 1 @ flush_pte
184 ENDPROC(cpu_v7_set_pte_ext)
186 string cpu_v7_name, "ARMv7 Processor"
190 * Memory region attributes with SCTLR.TRE=1
193 * TR = PRRR[2n+1:2n] - memory type
194 * IR = NMRR[2n+1:2n] - inner cacheable property
195 * OR = NMRR[2n+17:2n+16] - outer cacheable property
199 * BUFFERABLE 001 10 00 00
200 * WRITETHROUGH 010 10 10 10
201 * WRITEBACK 011 10 11 11
203 * WRITEALLOC 111 10 01 01
205 * DEV_NONSHARED 100 01
211 * DS0 = PRRR[16] = 0 - device shareable property
212 * DS1 = PRRR[17] = 1 - device shareable property
213 * NS0 = PRRR[18] = 0 - normal shareable property
214 * NS1 = PRRR[19] = 1 - normal shareable property
215 * NOS = PRRR[24+n] = 1 - not outer shareable
217 .equ PRRR, 0xff0a81a8
218 .equ NMRR, 0x40e040e0
220 /* Suspend/resume support: derived from arch/arm/mach-s5pv210/sleep.S */
221 .globl cpu_v7_suspend_size
222 .equ cpu_v7_suspend_size, 4 * 7
223 #ifdef CONFIG_ARM_CPU_SUSPEND
224 ENTRY(cpu_v7_do_suspend)
225 stmfd sp!, {r4 - r10, lr}
226 mrc p15, 0, r4, c13, c0, 0 @ FCSE/PID
227 mrc p15, 0, r5, c13, c0, 3 @ User r/o thread ID
229 mrc p15, 0, r6, c3, c0, 0 @ Domain ID
230 mrc p15, 0, r7, c2, c0, 1 @ TTB 1
231 mrc p15, 0, r8, c1, c0, 0 @ Control register
232 mrc p15, 0, r9, c1, c0, 1 @ Auxiliary control register
233 mrc p15, 0, r10, c1, c0, 2 @ Co-processor access control
235 ldmfd sp!, {r4 - r10, pc}
236 ENDPROC(cpu_v7_do_suspend)
238 ENTRY(cpu_v7_do_resume)
240 mcr p15, 0, ip, c8, c7, 0 @ invalidate TLBs
241 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
242 mcr p15, 0, ip, c13, c0, 1 @ set reserved context ID
244 mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID
245 mcr p15, 0, r5, c13, c0, 3 @ User r/o thread ID
247 mcr p15, 0, r6, c3, c0, 0 @ Domain ID
248 ALT_SMP(orr r1, r1, #TTB_FLAGS_SMP)
249 ALT_UP(orr r1, r1, #TTB_FLAGS_UP)
250 mcr p15, 0, r1, c2, c0, 0 @ TTB 0
251 mcr p15, 0, r7, c2, c0, 1 @ TTB 1
252 mcr p15, 0, ip, c2, c0, 2 @ TTB control register
253 mrc p15, 0, r4, c1, c0, 1 @ Read Auxiliary control register
254 teq r4, r9 @ Is it already set?
255 mcrne p15, 0, r9, c1, c0, 1 @ No, so write it
256 mcr p15, 0, r10, c1, c0, 2 @ Co-processor access control
259 mcr p15, 0, r4, c10, c2, 0 @ write PRRR
260 mcr p15, 0, r5, c10, c2, 1 @ write NMRR
263 mov r0, r8 @ control register
265 ENDPROC(cpu_v7_do_resume)
273 * Initialise TLB, Caches, and MMU state ready to switch the MMU
274 * on. Return in r0 the new CP15 C1 control register setting.
276 * This should be able to cover all ARMv7 cores.
278 * It is assumed that:
279 * - cache type register is implemented
283 mov r10, #(1 << 0) @ TLB ops broadcasting
289 ALT_SMP(mrc p15, 0, r0, c1, c0, 1)
290 ALT_UP(mov r0, #(1 << 6)) @ fake it for UP
291 tst r0, #(1 << 6) @ SMP/nAMP mode enabled?
292 orreq r0, r0, #(1 << 6) @ Enable SMP/nAMP mode
293 orreq r0, r0, r10 @ Enable CPU-specific SMP bits
294 mcreq p15, 0, r0, c1, c0, 1
297 adr r12, __v7_setup_stack @ the local stack
298 stmia r12, {r0-r5, r7, r9, r11, lr}
299 bl v7_flush_dcache_all
300 ldmia r12, {r0-r5, r7, r9, r11, lr}
302 mrc p15, 0, r0, c0, c0, 0 @ read main ID register
303 and r10, r0, #0xff000000 @ ARM?
306 and r5, r0, #0x00f00000 @ variant
307 and r6, r0, #0x0000000f @ revision
308 orr r6, r6, r5, lsr #20-4 @ combine variant and revision
309 ubfx r0, r0, #4, #12 @ primary part number
311 /* Cortex-A8 Errata */
312 ldr r10, =0x00000c08 @ Cortex-A8 primary part number
315 #ifdef CONFIG_ARM_ERRATA_430973
316 teq r5, #0x00100000 @ only present in r1p*
317 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
318 orreq r10, r10, #(1 << 6) @ set IBE to 1
319 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
321 #ifdef CONFIG_ARM_ERRATA_458693
322 teq r6, #0x20 @ only present in r2p0
323 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
324 orreq r10, r10, #(1 << 5) @ set L1NEON to 1
325 orreq r10, r10, #(1 << 9) @ set PLDNOP to 1
326 mcreq p15, 0, r10, c1, c0, 1 @ write aux control register
328 #ifdef CONFIG_ARM_ERRATA_460075
329 teq r6, #0x20 @ only present in r2p0
330 mrceq p15, 1, r10, c9, c0, 2 @ read L2 cache aux ctrl register
332 orreq r10, r10, #(1 << 22) @ set the Write Allocate disable bit
333 mcreq p15, 1, r10, c9, c0, 2 @ write the L2 cache aux ctrl register
337 /* Cortex-A9 Errata */
338 2: ldr r10, =0x00000c09 @ Cortex-A9 primary part number
341 #ifdef CONFIG_ARM_ERRATA_742230
342 cmp r6, #0x22 @ only present up to r2p2
343 mrcle p15, 0, r10, c15, c0, 1 @ read diagnostic register
344 orrle r10, r10, #1 << 4 @ set bit #4
345 mcrle p15, 0, r10, c15, c0, 1 @ write diagnostic register
347 #ifdef CONFIG_ARM_ERRATA_742231
348 teq r6, #0x20 @ present in r2p0
349 teqne r6, #0x21 @ present in r2p1
350 teqne r6, #0x22 @ present in r2p2
351 mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
352 orreq r10, r10, #1 << 12 @ set bit #12
353 orreq r10, r10, #1 << 22 @ set bit #22
354 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
356 #ifdef CONFIG_ARM_ERRATA_743622
357 teq r5, #0x00200000 @ only present in r2p*
358 mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
359 orreq r10, r10, #1 << 6 @ set bit #6
360 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
362 #if defined(CONFIG_ARM_ERRATA_751472) && defined(CONFIG_SMP)
363 ALT_SMP(cmp r6, #0x30) @ present prior to r3p0
365 mrclt p15, 0, r10, c15, c0, 1 @ read diagnostic register
366 orrlt r10, r10, #1 << 11 @ set bit #11
367 mcrlt p15, 0, r10, c15, c0, 1 @ write diagnostic register
372 mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate
375 mcr p15, 0, r10, c8, c7, 0 @ invalidate I + D TLBs
376 mcr p15, 0, r10, c2, c0, 2 @ TTB control register
377 ALT_SMP(orr r4, r4, #TTB_FLAGS_SMP)
378 ALT_UP(orr r4, r4, #TTB_FLAGS_UP)
379 ALT_SMP(orr r8, r8, #TTB_FLAGS_SMP)
380 ALT_UP(orr r8, r8, #TTB_FLAGS_UP)
381 mcr p15, 0, r8, c2, c0, 1 @ load TTB1
384 mcr p15, 0, r5, c10, c2, 0 @ write PRRR
385 mcr p15, 0, r6, c10, c2, 1 @ write NMRR
387 #ifndef CONFIG_ARM_THUMBEE
388 mrc p15, 0, r0, c0, c1, 0 @ read ID_PFR0 for ThumbEE
389 and r0, r0, #(0xf << 12) @ ThumbEE enabled field
390 teq r0, #(1 << 12) @ check if ThumbEE is present
393 mcr p14, 6, r5, c1, c0, 0 @ Initialize TEEHBR to 0
394 mrc p14, 6, r0, c0, c0, 0 @ load TEECR
395 orr r0, r0, #1 @ set the 1st bit in order to
396 mcr p14, 6, r0, c0, c0, 0 @ stop userspace TEEHBR access
401 #ifdef CONFIG_CPU_ENDIAN_BE8
402 orr r6, r6, #1 << 25 @ big-endian page tables
404 #ifdef CONFIG_SWP_EMULATE
405 orr r5, r5, #(1 << 10) @ set SW bit in "clear"
406 bic r6, r6, #(1 << 10) @ clear it in "mmuset"
408 mrc p15, 0, r0, c1, c0, 0 @ read control register
409 bic r0, r0, r5 @ clear bits them
410 orr r0, r0, r6 @ set them
411 THUMB( orr r0, r0, #1 << 30 ) @ Thumb exceptions
412 mov pc, lr @ return to head.S:__ret
416 * TFR EV X F I D LR S
417 * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
418 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
419 * 1 0 110 0011 1100 .111 1101 < we want
421 .type v7_crval, #object
423 crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c
426 .space 4 * 11 @ 11 registers
430 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
431 define_processor_functions v7, dabort=v7_early_abort, pabort=v7_pabort, suspend=1
435 string cpu_arch_name, "armv7"
436 string cpu_elf_name, "v7"
439 .section ".proc.info.init", #alloc, #execinstr
442 * Standard v7 proc info content
444 .macro __v7_proc initfunc, mm_mmuflags = 0, io_mmuflags = 0, hwcaps = 0
445 ALT_SMP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | \
446 PMD_FLAGS_SMP | \mm_mmuflags)
447 ALT_UP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | \
448 PMD_FLAGS_UP | \mm_mmuflags)
449 .long PMD_TYPE_SECT | PMD_SECT_XN | PMD_SECT_AP_WRITE | \
450 PMD_SECT_AP_READ | \io_mmuflags
454 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | HWCAP_FAST_MULT | \
455 HWCAP_EDSP | HWCAP_TLS | \hwcaps
457 .long v7_processor_functions
464 * ARM Ltd. Cortex A5 processor.
466 .type __v7_ca5mp_proc_info, #object
467 __v7_ca5mp_proc_info:
470 __v7_proc __v7_ca5mp_setup
471 .size __v7_ca5mp_proc_info, . - __v7_ca5mp_proc_info
474 * ARM Ltd. Cortex A9 processor.
476 .type __v7_ca9mp_proc_info, #object
477 __v7_ca9mp_proc_info:
480 __v7_proc __v7_ca9mp_setup
481 .size __v7_ca9mp_proc_info, . - __v7_ca9mp_proc_info
484 * ARM Ltd. Cortex A15 processor.
486 .type __v7_ca15mp_proc_info, #object
487 __v7_ca15mp_proc_info:
490 __v7_proc __v7_ca15mp_setup, hwcaps = HWCAP_IDIV
491 .size __v7_ca15mp_proc_info, . - __v7_ca15mp_proc_info
494 * Match any ARMv7 processor core.
496 .type __v7_proc_info, #object
498 .long 0x000f0000 @ Required ID value
499 .long 0x000f0000 @ Mask for ID
501 .size __v7_proc_info, . - __v7_proc_info