| /* |
| * linux/arch/arm/mm/proc-v7.S |
| * |
| * Copyright (C) 2001 Deep Blue Solutions Ltd. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This is the "shell" of the ARMv7 processor support. |
| */ |
| #include <linux/init.h> |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/hwcap.h> |
| #include <asm/pgtable-hwdef.h> |
| #include <asm/pgtable.h> |
| |
| #include "proc-macros.S" |
| |
| #define TTB_S (1 << 1) |
| #define TTB_RGN_NC (0 << 3) |
| #define TTB_RGN_OC_WBWA (1 << 3) |
| #define TTB_RGN_OC_WT (2 << 3) |
| #define TTB_RGN_OC_WB (3 << 3) |
| #define TTB_NOS (1 << 5) |
| #define TTB_IRGN_NC ((0 << 0) | (0 << 6)) |
| #define TTB_IRGN_WBWA ((0 << 0) | (1 << 6)) |
| #define TTB_IRGN_WT ((1 << 0) | (0 << 6)) |
| #define TTB_IRGN_WB ((1 << 0) | (1 << 6)) |
| |
| /* PTWs cacheable, inner WB not shareable, outer WB not shareable */ |
| #define TTB_FLAGS_UP TTB_IRGN_WB|TTB_RGN_OC_WB |
| #define PMD_FLAGS_UP PMD_SECT_WB |
| |
| /* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */ |
| #define TTB_FLAGS_SMP TTB_IRGN_WBWA|TTB_S|TTB_NOS|TTB_RGN_OC_WBWA |
| #define PMD_FLAGS_SMP PMD_SECT_WBWA|PMD_SECT_S |
| |
| ENTRY(cpu_v7_proc_init) |
| mov pc, lr |
| ENDPROC(cpu_v7_proc_init) |
| |
| ENTRY(cpu_v7_proc_fin) |
| mrc p15, 0, r0, c1, c0, 0 @ ctrl register |
| bic r0, r0, #0x1000 @ ...i............ |
| bic r0, r0, #0x0006 @ .............ca. |
| mcr p15, 0, r0, c1, c0, 0 @ disable caches |
| mov pc, lr |
| ENDPROC(cpu_v7_proc_fin) |
| |
| /* |
| * cpu_v7_reset(loc) |
| * |
| * Perform a soft reset of the system. Put the CPU into the |
| * same state as it would be if it had been reset, and branch |
| * to what would be the reset vector. |
| * |
| * - loc - location to jump to for soft reset |
| */ |
| .align 5 |
| ENTRY(cpu_v7_reset) |
| mov pc, r0 |
| ENDPROC(cpu_v7_reset) |
| |
| /* |
| * cpu_v7_do_idle() |
| * |
| * Idle the processor (eg, wait for interrupt). |
| * |
| * IRQs are already disabled. |
| */ |
| ENTRY(cpu_v7_do_idle) |
| dsb @ WFI may enter a low-power mode |
| wfi |
| mov pc, lr |
| ENDPROC(cpu_v7_do_idle) |
| |
| ENTRY(cpu_v7_dcache_clean_area) |
| #ifndef TLB_CAN_READ_FROM_L1_CACHE |
| dcache_line_size r2, r3 |
| 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
| add r0, r0, r2 |
| subs r1, r1, r2 |
| bhi 1b |
| dsb |
| #endif |
| mov pc, lr |
| ENDPROC(cpu_v7_dcache_clean_area) |
| |
| /* |
| * cpu_v7_switch_mm(pgd_phys, tsk) |
| * |
| * Set the translation table base pointer to be pgd_phys |
| * |
| * - pgd_phys - physical address of new TTB |
| * |
| * It is assumed that: |
| * - we are not using split page tables |
| */ |
| ENTRY(cpu_v7_switch_mm) |
| #ifdef CONFIG_MMU |
| mov r2, #0 |
| ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id |
| ALT_SMP(orr r0, r0, #TTB_FLAGS_SMP) |
| ALT_UP(orr r0, r0, #TTB_FLAGS_UP) |
| #ifdef CONFIG_ARM_ERRATA_430973 |
| mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_754322 |
| dsb |
| #endif |
| mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID |
| isb |
| 1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 |
| isb |
| #ifdef CONFIG_ARM_ERRATA_754322 |
| dsb |
| #endif |
| mcr p15, 0, r1, c13, c0, 1 @ set context ID |
| isb |
| #endif |
| mov pc, lr |
| ENDPROC(cpu_v7_switch_mm) |
| |
| /* |
| * cpu_v7_set_pte_ext(ptep, pte) |
| * |
| * Set a level 2 translation table entry. |
| * |
| * - ptep - pointer to level 2 translation table entry |
| * (hardware version is stored at +2048 bytes) |
| * - pte - PTE value to store |
| * - ext - value for extended PTE bits |
| */ |
| ENTRY(cpu_v7_set_pte_ext) |
| #ifdef CONFIG_MMU |
| str r1, [r0] @ linux version |
| |
| bic r3, r1, #0x000003f0 |
| bic r3, r3, #PTE_TYPE_MASK |
| orr r3, r3, r2 |
| orr r3, r3, #PTE_EXT_AP0 | 2 |
| |
| tst r1, #1 << 4 |
| orrne r3, r3, #PTE_EXT_TEX(1) |
| |
| eor r1, r1, #L_PTE_DIRTY |
| tst r1, #L_PTE_RDONLY | L_PTE_DIRTY |
| orrne r3, r3, #PTE_EXT_APX |
| |
| tst r1, #L_PTE_USER |
| orrne r3, r3, #PTE_EXT_AP1 |
| #ifdef CONFIG_CPU_USE_DOMAINS |
| @ allow kernel read/write access to read-only user pages |
| tstne r3, #PTE_EXT_APX |
| bicne r3, r3, #PTE_EXT_APX | PTE_EXT_AP0 |
| #endif |
| |
| tst r1, #L_PTE_XN |
| orrne r3, r3, #PTE_EXT_XN |
| |
| tst r1, #L_PTE_YOUNG |
| tstne r1, #L_PTE_PRESENT |
| moveq r3, #0 |
| |
| ARM( str r3, [r0, #2048]! ) |
| THUMB( add r0, r0, #2048 ) |
| THUMB( str r3, [r0] ) |
| mcr p15, 0, r0, c7, c10, 1 @ flush_pte |
| #endif |
| mov pc, lr |
| ENDPROC(cpu_v7_set_pte_ext) |
| |
| cpu_v7_name: |
| .ascii "ARMv7 Processor" |
| .align |
| |
| /* |
| * Memory region attributes with SCTLR.TRE=1 |
| * |
| * n = TEX[0],C,B |
| * TR = PRRR[2n+1:2n] - memory type |
| * IR = NMRR[2n+1:2n] - inner cacheable property |
| * OR = NMRR[2n+17:2n+16] - outer cacheable property |
| * |
| * n TR IR OR |
| * UNCACHED 000 00 |
| * BUFFERABLE 001 10 00 00 |
| * WRITETHROUGH 010 10 10 10 |
| * WRITEBACK 011 10 11 11 |
| * reserved 110 |
| * WRITEALLOC 111 10 01 01 |
| * DEV_SHARED 100 01 |
| * DEV_NONSHARED 100 01 |
| * DEV_WC 001 10 |
| * DEV_CACHED 011 10 |
| * |
| * Other attributes: |
| * |
| * DS0 = PRRR[16] = 0 - device shareable property |
| * DS1 = PRRR[17] = 1 - device shareable property |
| * NS0 = PRRR[18] = 0 - normal shareable property |
| * NS1 = PRRR[19] = 1 - normal shareable property |
| * NOS = PRRR[24+n] = 1 - not outer shareable |
| */ |
| .equ PRRR, 0xff0a81a8 |
| .equ NMRR, 0x40e040e0 |
| |
| /* Suspend/resume support: derived from arch/arm/mach-s5pv210/sleep.S */ |
| .globl cpu_v7_suspend_size |
| .equ cpu_v7_suspend_size, 4 * 8 |
| #ifdef CONFIG_PM_SLEEP |
| ENTRY(cpu_v7_do_suspend) |
| stmfd sp!, {r4 - r11, lr} |
| mrc p15, 0, r4, c13, c0, 0 @ FCSE/PID |
| mrc p15, 0, r5, c13, c0, 1 @ Context ID |
| mrc p15, 0, r6, c3, c0, 0 @ Domain ID |
| mrc p15, 0, r7, c2, c0, 0 @ TTB 0 |
| mrc p15, 0, r8, c2, c0, 1 @ TTB 1 |
| mrc p15, 0, r9, c1, c0, 0 @ Control register |
| mrc p15, 0, r10, c1, c0, 1 @ Auxiliary control register |
| mrc p15, 0, r11, c1, c0, 2 @ Co-processor access control |
| stmia r0, {r4 - r11} |
| ldmfd sp!, {r4 - r11, pc} |
| ENDPROC(cpu_v7_do_suspend) |
| |
| ENTRY(cpu_v7_do_resume) |
| mov ip, #0 |
| mcr p15, 0, ip, c8, c7, 0 @ invalidate TLBs |
| mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache |
| ldmia r0, {r4 - r11} |
| mcr p15, 0, r4, c13, c0, 0 @ FCSE/PID |
| mcr p15, 0, r5, c13, c0, 1 @ Context ID |
| mcr p15, 0, r6, c3, c0, 0 @ Domain ID |
| mcr p15, 0, r7, c2, c0, 0 @ TTB 0 |
| mcr p15, 0, r8, c2, c0, 1 @ TTB 1 |
| mcr p15, 0, ip, c2, c0, 2 @ TTB control register |
| mcr p15, 0, r10, c1, c0, 1 @ Auxiliary control register |
| mcr p15, 0, r11, c1, c0, 2 @ Co-processor access control |
| ldr r4, =PRRR @ PRRR |
| ldr r5, =NMRR @ NMRR |
| mcr p15, 0, r4, c10, c2, 0 @ write PRRR |
| mcr p15, 0, r5, c10, c2, 1 @ write NMRR |
| isb |
| mov r0, r9 @ control register |
| mov r2, r7, lsr #14 @ get TTB0 base |
| mov r2, r2, lsl #14 |
| ldr r3, cpu_resume_l1_flags |
| b cpu_resume_mmu |
| ENDPROC(cpu_v7_do_resume) |
| cpu_resume_l1_flags: |
| ALT_SMP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_SMP) |
| ALT_UP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_UP) |
| #else |
| #define cpu_v7_do_suspend 0 |
| #define cpu_v7_do_resume 0 |
| #endif |
| |
| __CPUINIT |
| |
| /* |
| * __v7_setup |
| * |
| * Initialise TLB, Caches, and MMU state ready to switch the MMU |
| * on. Return in r0 the new CP15 C1 control register setting. |
| * |
| * We automatically detect if we have a Harvard cache, and use the |
| * Harvard cache control instructions insead of the unified cache |
| * control instructions. |
| * |
| * This should be able to cover all ARMv7 cores. |
| * |
| * It is assumed that: |
| * - cache type register is implemented |
| */ |
| __v7_ca9mp_setup: |
| #ifdef CONFIG_SMP |
| ALT_SMP(mrc p15, 0, r0, c1, c0, 1) |
| ALT_UP(mov r0, #(1 << 6)) @ fake it for UP |
| tst r0, #(1 << 6) @ SMP/nAMP mode enabled? |
| orreq r0, r0, #(1 << 6) | (1 << 0) @ Enable SMP/nAMP mode and |
| mcreq p15, 0, r0, c1, c0, 1 @ TLB ops broadcasting |
| #endif |
| __v7_setup: |
| adr r12, __v7_setup_stack @ the local stack |
| stmia r12, {r0-r5, r7, r9, r11, lr} |
| bl v7_flush_dcache_all |
| ldmia r12, {r0-r5, r7, r9, r11, lr} |
| |
| mrc p15, 0, r0, c0, c0, 0 @ read main ID register |
| and r10, r0, #0xff000000 @ ARM? |
| teq r10, #0x41000000 |
| bne 3f |
| and r5, r0, #0x00f00000 @ variant |
| and r6, r0, #0x0000000f @ revision |
| orr r6, r6, r5, lsr #20-4 @ combine variant and revision |
| ubfx r0, r0, #4, #12 @ primary part number |
| |
| /* Cortex-A8 Errata */ |
| ldr r10, =0x00000c08 @ Cortex-A8 primary part number |
| teq r0, r10 |
| bne 2f |
| #ifdef CONFIG_ARM_ERRATA_430973 |
| teq r5, #0x00100000 @ only present in r1p* |
| mrceq p15, 0, r10, c1, c0, 1 @ read aux control register |
| orreq r10, r10, #(1 << 6) @ set IBE to 1 |
| mcreq p15, 0, r10, c1, c0, 1 @ write aux control register |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_458693 |
| teq r6, #0x20 @ only present in r2p0 |
| mrceq p15, 0, r10, c1, c0, 1 @ read aux control register |
| orreq r10, r10, #(1 << 5) @ set L1NEON to 1 |
| orreq r10, r10, #(1 << 9) @ set PLDNOP to 1 |
| mcreq p15, 0, r10, c1, c0, 1 @ write aux control register |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_460075 |
| teq r6, #0x20 @ only present in r2p0 |
| mrceq p15, 1, r10, c9, c0, 2 @ read L2 cache aux ctrl register |
| tsteq r10, #1 << 22 |
| orreq r10, r10, #(1 << 22) @ set the Write Allocate disable bit |
| mcreq p15, 1, r10, c9, c0, 2 @ write the L2 cache aux ctrl register |
| #endif |
| b 3f |
| |
| /* Cortex-A9 Errata */ |
| 2: ldr r10, =0x00000c09 @ Cortex-A9 primary part number |
| teq r0, r10 |
| bne 3f |
| #ifdef CONFIG_ARM_ERRATA_742230 |
| cmp r6, #0x22 @ only present up to r2p2 |
| mrcle p15, 0, r10, c15, c0, 1 @ read diagnostic register |
| orrle r10, r10, #1 << 4 @ set bit #4 |
| mcrle p15, 0, r10, c15, c0, 1 @ write diagnostic register |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_742231 |
| teq r6, #0x20 @ present in r2p0 |
| teqne r6, #0x21 @ present in r2p1 |
| teqne r6, #0x22 @ present in r2p2 |
| mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register |
| orreq r10, r10, #1 << 12 @ set bit #12 |
| orreq r10, r10, #1 << 22 @ set bit #22 |
| mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_743622 |
| teq r6, #0x20 @ present in r2p0 |
| teqne r6, #0x21 @ present in r2p1 |
| teqne r6, #0x22 @ present in r2p2 |
| mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register |
| orreq r10, r10, #1 << 6 @ set bit #6 |
| mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_751472 |
| cmp r6, #0x30 @ present prior to r3p0 |
| mrclt p15, 0, r10, c15, c0, 1 @ read diagnostic register |
| orrlt r10, r10, #1 << 11 @ set bit #11 |
| mcrlt p15, 0, r10, c15, c0, 1 @ write diagnostic register |
| #endif |
| |
| 3: mov r10, #0 |
| #ifdef HARVARD_CACHE |
| mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate |
| #endif |
| dsb |
| #ifdef CONFIG_MMU |
| mcr p15, 0, r10, c8, c7, 0 @ invalidate I + D TLBs |
| mcr p15, 0, r10, c2, c0, 2 @ TTB control register |
| ALT_SMP(orr r4, r4, #TTB_FLAGS_SMP) |
| ALT_UP(orr r4, r4, #TTB_FLAGS_UP) |
| mcr p15, 0, r4, c2, c0, 1 @ load TTB1 |
| ldr r5, =PRRR @ PRRR |
| ldr r6, =NMRR @ NMRR |
| mcr p15, 0, r5, c10, c2, 0 @ write PRRR |
| mcr p15, 0, r6, c10, c2, 1 @ write NMRR |
| #endif |
| adr r5, v7_crval |
| ldmia r5, {r5, r6} |
| #ifdef CONFIG_CPU_ENDIAN_BE8 |
| orr r6, r6, #1 << 25 @ big-endian page tables |
| #endif |
| #ifdef CONFIG_SWP_EMULATE |
| orr r5, r5, #(1 << 10) @ set SW bit in "clear" |
| bic r6, r6, #(1 << 10) @ clear it in "mmuset" |
| #endif |
| mrc p15, 0, r0, c1, c0, 0 @ read control register |
| bic r0, r0, r5 @ clear bits them |
| orr r0, r0, r6 @ set them |
| THUMB( orr r0, r0, #1 << 30 ) @ Thumb exceptions |
| mov pc, lr @ return to head.S:__ret |
| ENDPROC(__v7_setup) |
| |
| /* AT |
| * TFR EV X F I D LR S |
| * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM |
| * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced |
| * 1 0 110 0011 1100 .111 1101 < we want |
| */ |
| .type v7_crval, #object |
| v7_crval: |
| crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c |
| |
| __v7_setup_stack: |
| .space 4 * 11 @ 11 registers |
| |
| __INITDATA |
| |
| .type v7_processor_functions, #object |
| ENTRY(v7_processor_functions) |
| .word v7_early_abort |
| .word v7_pabort |
| .word cpu_v7_proc_init |
| .word cpu_v7_proc_fin |
| .word cpu_v7_reset |
| .word cpu_v7_do_idle |
| .word cpu_v7_dcache_clean_area |
| .word cpu_v7_switch_mm |
| .word cpu_v7_set_pte_ext |
| .word 0 |
| .word 0 |
| .word 0 |
| .size v7_processor_functions, . - v7_processor_functions |
| |
| .section ".rodata" |
| |
| .type cpu_arch_name, #object |
| cpu_arch_name: |
| .asciz "armv7" |
| .size cpu_arch_name, . - cpu_arch_name |
| |
| .type cpu_elf_name, #object |
| cpu_elf_name: |
| .asciz "v7" |
| .size cpu_elf_name, . - cpu_elf_name |
| .align |
| |
| .section ".proc.info.init", #alloc, #execinstr |
| |
| .type __v7_ca9mp_proc_info, #object |
| __v7_ca9mp_proc_info: |
| .long 0x410fc090 @ Required ID value |
| .long 0xff0ffff0 @ Mask for ID |
| ALT_SMP(.long \ |
| PMD_TYPE_SECT | \ |
| PMD_SECT_AP_WRITE | \ |
| PMD_SECT_AP_READ | \ |
| PMD_FLAGS_SMP) |
| ALT_UP(.long \ |
| PMD_TYPE_SECT | \ |
| PMD_SECT_AP_WRITE | \ |
| PMD_SECT_AP_READ | \ |
| PMD_FLAGS_UP) |
| .long PMD_TYPE_SECT | \ |
| PMD_SECT_XN | \ |
| PMD_SECT_AP_WRITE | \ |
| PMD_SECT_AP_READ |
| W(b) __v7_ca9mp_setup |
| .long cpu_arch_name |
| .long cpu_elf_name |
| .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_TLS |
| .long cpu_v7_name |
| .long v7_processor_functions |
| .long v7wbi_tlb_fns |
| .long v6_user_fns |
| .long v7_cache_fns |
| .size __v7_ca9mp_proc_info, . - __v7_ca9mp_proc_info |
| |
| /* |
| * Match any ARMv7 processor core. |
| */ |
| .type __v7_proc_info, #object |
| __v7_proc_info: |
| .long 0x000f0000 @ Required ID value |
| .long 0x000f0000 @ Mask for ID |
| ALT_SMP(.long \ |
| PMD_TYPE_SECT | \ |
| PMD_SECT_AP_WRITE | \ |
| PMD_SECT_AP_READ | \ |
| PMD_FLAGS_SMP) |
| ALT_UP(.long \ |
| PMD_TYPE_SECT | \ |
| PMD_SECT_AP_WRITE | \ |
| PMD_SECT_AP_READ | \ |
| PMD_FLAGS_UP) |
| .long PMD_TYPE_SECT | \ |
| PMD_SECT_XN | \ |
| PMD_SECT_AP_WRITE | \ |
| PMD_SECT_AP_READ |
| W(b) __v7_setup |
| .long cpu_arch_name |
| .long cpu_elf_name |
| .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_TLS |
| .long cpu_v7_name |
| .long v7_processor_functions |
| .long v7wbi_tlb_fns |
| .long v6_user_fns |
| .long v7_cache_fns |
| .size __v7_proc_info, . - __v7_proc_info |