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author | Vladimir Murzin <vladimir.murzin@arm.com> | 2018-04-03 10:39:23 +0100 |
---|---|---|
committer | Russell King <rmk+kernel@armlinux.org.uk> | 2018-05-19 11:53:46 +0100 |
commit | 046835b4aa22b9ab6aa0bb274e3b71047c4b887d (patch) | |
tree | 1f1e8dc8ed4c30f03ba51d930a6f79a923959937 /arch/arm/kernel | |
parent | 3c24121039c9da14692eb48f6e39565b28c0f3cf (diff) | |
download | linux-046835b4aa22b9ab6aa0bb274e3b71047c4b887d.tar.gz linux-046835b4aa22b9ab6aa0bb274e3b71047c4b887d.tar.bz2 linux-046835b4aa22b9ab6aa0bb274e3b71047c4b887d.zip |
ARM: 8757/1: NOMMU: Support PMSAv8 MPU
ARMv8R/M architecture defines new memory protection scheme - PMSAv8
which is not compatible with PMSAv7.
Key differences to PMSAv7 are:
- Region geometry is defined by base and limit addresses
- Addresses need to be either 32 or 64 byte aligned
- No region priority due to overlapping regions are not allowed
- It is unified, i.e. no distinction between data/instruction regions
- Memory attributes are controlled via MAIR
This patch implements support for PMSAv8 MPU defined by ARMv8R/M
architecture.
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r-- | arch/arm/kernel/asm-offsets.c | 2 | ||||
-rw-r--r-- | arch/arm/kernel/head-nommu.S | 163 | ||||
-rw-r--r-- | arch/arm/kernel/vmlinux-xip.lds.S | 4 | ||||
-rw-r--r-- | arch/arm/kernel/vmlinux.lds.S | 7 |
4 files changed, 176 insertions, 0 deletions
diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c index 250a98544ca6..27c5381518d8 100644 --- a/arch/arm/kernel/asm-offsets.c +++ b/arch/arm/kernel/asm-offsets.c @@ -197,6 +197,8 @@ int main(void) DEFINE(MPU_RGN_DRBAR, offsetof(struct mpu_rgn, drbar)); DEFINE(MPU_RGN_DRSR, offsetof(struct mpu_rgn, drsr)); DEFINE(MPU_RGN_DRACR, offsetof(struct mpu_rgn, dracr)); + DEFINE(MPU_RGN_PRBAR, offsetof(struct mpu_rgn, prbar)); + DEFINE(MPU_RGN_PRLAR, offsetof(struct mpu_rgn, prlar)); #endif return 0; } diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S index 2f0f1ba6e237..dd546d65a383 100644 --- a/arch/arm/kernel/head-nommu.S +++ b/arch/arm/kernel/head-nommu.S @@ -132,6 +132,25 @@ M_CLASS(ldr r3, [r12, 0x50]) AR_CLASS(mrc p15, 0, r3, c0, c1, 4) @ Read ID_MMFR0 and r3, r3, #(MMFR0_PMSA) @ PMSA field teq r3, #(MMFR0_PMSAv7) @ PMSA v7 + beq 1f + teq r3, #(MMFR0_PMSAv8) @ PMSA v8 + /* + * Memory region attributes for PMSAv8: + * + * n = AttrIndx[2:0] + * n MAIR + * DEVICE_nGnRnE 000 00000000 + * NORMAL 001 11111111 + */ + ldreq r3, =PMSAv8_MAIR(0x00, PMSAv8_RGN_DEVICE_nGnRnE) | \ + PMSAv8_MAIR(0xff, PMSAv8_RGN_NORMAL) +AR_CLASS(mcreq p15, 0, r3, c10, c2, 0) @ MAIR 0 +M_CLASS(streq r3, [r12, #PMSAv8_MAIR0]) + moveq r3, #0 +AR_CLASS(mcreq p15, 0, r3, c10, c2, 1) @ MAIR 1 +M_CLASS(streq r3, [r12, #PMSAv8_MAIR1]) + +1: #endif #ifdef CONFIG_CPU_CP15 /* @@ -235,6 +254,8 @@ M_CLASS(ldr r0, [r12, 0x50]) and r0, r0, #(MMFR0_PMSA) @ PMSA field teq r0, #(MMFR0_PMSAv7) @ PMSA v7 beq __setup_pmsa_v7 + teq r0, #(MMFR0_PMSAv8) @ PMSA v8 + beq __setup_pmsa_v8 ret lr ENDPROC(__setup_mpu) @@ -304,6 +325,119 @@ M_CLASS(ldr r0, [r12, #MPU_TYPE]) ret lr ENDPROC(__setup_pmsa_v7) +ENTRY(__setup_pmsa_v8) + mov r0, #0 +AR_CLASS(mcr p15, 0, r0, c6, c2, 1) @ PRSEL +M_CLASS(str r0, [r12, #PMSAv8_RNR]) + isb + +#ifdef CONFIG_XIP_KERNEL + ldr r5, =CONFIG_XIP_PHYS_ADDR @ ROM start + ldr r6, =(_exiprom) @ ROM end + sub r6, r6, #1 + bic r6, r6, #(PMSAv8_MINALIGN - 1) + + orr r5, r5, #(PMSAv8_AP_PL1RW_PL0NA | PMSAv8_RGN_SHARED) + orr r6, r6, #(PMSAv8_LAR_IDX(PMSAv8_RGN_NORMAL) | PMSAv8_LAR_EN) + +AR_CLASS(mcr p15, 0, r5, c6, c8, 0) @ PRBAR0 +AR_CLASS(mcr p15, 0, r6, c6, c8, 1) @ PRLAR0 +M_CLASS(str r5, [r12, #PMSAv8_RBAR_A(0)]) +M_CLASS(str r6, [r12, #PMSAv8_RLAR_A(0)]) +#endif + + ldr r5, =KERNEL_START + ldr r6, =KERNEL_END + sub r6, r6, #1 + bic r6, r6, #(PMSAv8_MINALIGN - 1) + + orr r5, r5, #(PMSAv8_AP_PL1RW_PL0NA | PMSAv8_RGN_SHARED) + orr r6, r6, #(PMSAv8_LAR_IDX(PMSAv8_RGN_NORMAL) | PMSAv8_LAR_EN) + +AR_CLASS(mcr p15, 0, r5, c6, c8, 4) @ PRBAR1 +AR_CLASS(mcr p15, 0, r6, c6, c8, 5) @ PRLAR1 +M_CLASS(str r5, [r12, #PMSAv8_RBAR_A(1)]) +M_CLASS(str r6, [r12, #PMSAv8_RLAR_A(1)]) + + /* Setup Background: 0x0 - min(KERNEL_START, XIP_PHYS_ADDR) */ +#ifdef CONFIG_XIP_KERNEL + ldr r6, =KERNEL_START + ldr r5, =CONFIG_XIP_PHYS_ADDR + cmp r6, r5 + movcs r6, r5 +#else + ldr r6, =KERNEL_START +#endif + cmp r6, #0 + beq 1f + + mov r5, #0 + sub r6, r6, #1 + bic r6, r6, #(PMSAv8_MINALIGN - 1) + + orr r5, r5, #(PMSAv8_AP_PL1RW_PL0NA | PMSAv8_RGN_SHARED | PMSAv8_BAR_XN) + orr r6, r6, #(PMSAv8_LAR_IDX(PMSAv8_RGN_DEVICE_nGnRnE) | PMSAv8_LAR_EN) + +AR_CLASS(mcr p15, 0, r5, c6, c9, 0) @ PRBAR2 +AR_CLASS(mcr p15, 0, r6, c6, c9, 1) @ PRLAR2 +M_CLASS(str r5, [r12, #PMSAv8_RBAR_A(2)]) +M_CLASS(str r6, [r12, #PMSAv8_RLAR_A(2)]) + +1: + /* Setup Background: max(KERNEL_END, _exiprom) - 0xffffffff */ +#ifdef CONFIG_XIP_KERNEL + ldr r5, =KERNEL_END + ldr r6, =(_exiprom) + cmp r5, r6 + movcc r5, r6 +#else + ldr r5, =KERNEL_END +#endif + mov r6, #0xffffffff + bic r6, r6, #(PMSAv8_MINALIGN - 1) + + orr r5, r5, #(PMSAv8_AP_PL1RW_PL0NA | PMSAv8_RGN_SHARED | PMSAv8_BAR_XN) + orr r6, r6, #(PMSAv8_LAR_IDX(PMSAv8_RGN_DEVICE_nGnRnE) | PMSAv8_LAR_EN) + +AR_CLASS(mcr p15, 0, r5, c6, c9, 4) @ PRBAR3 +AR_CLASS(mcr p15, 0, r6, c6, c9, 5) @ PRLAR3 +M_CLASS(str r5, [r12, #PMSAv8_RBAR_A(3)]) +M_CLASS(str r6, [r12, #PMSAv8_RLAR_A(3)]) + +#ifdef CONFIG_XIP_KERNEL + /* Setup Background: min(_exiprom, KERNEL_END) - max(KERNEL_START, XIP_PHYS_ADDR) */ + ldr r5, =(_exiprom) + ldr r6, =KERNEL_END + cmp r5, r6 + movcs r5, r6 + + ldr r6, =KERNEL_START + ldr r0, =CONFIG_XIP_PHYS_ADDR + cmp r6, r0 + movcc r6, r0 + + sub r6, r6, #1 + bic r6, r6, #(PMSAv8_MINALIGN - 1) + + orr r5, r5, #(PMSAv8_AP_PL1RW_PL0NA | PMSAv8_RGN_SHARED | PMSAv8_BAR_XN) + orr r6, r6, #(PMSAv8_LAR_IDX(PMSAv8_RGN_DEVICE_nGnRnE) | PMSAv8_LAR_EN) + +#ifdef CONFIG_CPU_V7M + /* There is no alias for n == 4 */ + mov r0, #4 + str r0, [r12, #PMSAv8_RNR] @ PRSEL + isb + + str r5, [r12, #PMSAv8_RBAR_A(0)] + str r6, [r12, #PMSAv8_RLAR_A(0)] +#else + mcr p15, 0, r5, c6, c10, 1 @ PRBAR4 + mcr p15, 0, r6, c6, c10, 2 @ PRLAR4 +#endif +#endif + ret lr +ENDPROC(__setup_pmsa_v8) + #ifdef CONFIG_SMP /* * r6: pointer at mpu_rgn_info @@ -319,6 +453,8 @@ ENTRY(__secondary_setup_mpu) and r0, r0, #(MMFR0_PMSA) @ PMSA field teq r0, #(MMFR0_PMSAv7) @ PMSA v7 beq __secondary_setup_pmsa_v7 + teq r0, #(MMFR0_PMSAv8) @ PMSA v8 + beq __secondary_setup_pmsa_v8 b __error_p ENDPROC(__secondary_setup_mpu) @@ -361,6 +497,33 @@ ENTRY(__secondary_setup_pmsa_v7) ret lr ENDPROC(__secondary_setup_pmsa_v7) +ENTRY(__secondary_setup_pmsa_v8) + ldr r4, [r6, #MPU_RNG_INFO_USED] +#ifndef CONFIG_XIP_KERNEL + add r4, r4, #1 +#endif + mov r5, #MPU_RNG_SIZE + add r3, r6, #MPU_RNG_INFO_RNGS + mla r3, r4, r5, r3 + +1: + sub r3, r3, #MPU_RNG_SIZE + sub r4, r4, #1 + + mcr p15, 0, r4, c6, c2, 1 @ PRSEL + isb + + ldr r5, [r3, #MPU_RGN_PRBAR] + ldr r6, [r3, #MPU_RGN_PRLAR] + + mcr p15, 0, r5, c6, c3, 0 @ PRBAR + mcr p15, 0, r6, c6, c3, 1 @ PRLAR + + cmp r4, #0 + bgt 1b + + ret lr +ENDPROC(__secondary_setup_pmsa_v8) #endif /* CONFIG_SMP */ #endif /* CONFIG_ARM_MPU */ #include "head-common.S" diff --git a/arch/arm/kernel/vmlinux-xip.lds.S b/arch/arm/kernel/vmlinux-xip.lds.S index d32f5d35f602..3593d5c1acd2 100644 --- a/arch/arm/kernel/vmlinux-xip.lds.S +++ b/arch/arm/kernel/vmlinux-xip.lds.S @@ -13,6 +13,7 @@ #include <asm/cache.h> #include <asm/thread_info.h> #include <asm/memory.h> +#include <asm/mpu.h> #include <asm/page.h> #include "vmlinux.lds.h" @@ -148,6 +149,9 @@ SECTIONS __init_end = .; BSS_SECTION(0, 0, 8) +#ifdef CONFIG_ARM_MPU + . = ALIGN(PMSAv8_MINALIGN); +#endif _end = .; STABS_DEBUG diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S index b77dc675ae55..23150c0f0f4d 100644 --- a/arch/arm/kernel/vmlinux.lds.S +++ b/arch/arm/kernel/vmlinux.lds.S @@ -12,6 +12,7 @@ #include <asm/cache.h> #include <asm/thread_info.h> #include <asm/memory.h> +#include <asm/mpu.h> #include <asm/page.h> #include <asm/pgtable.h> @@ -54,6 +55,9 @@ SECTIONS . = ALIGN(1<<SECTION_SHIFT); #endif +#ifdef CONFIG_ARM_MPU + . = ALIGN(PMSAv8_MINALIGN); +#endif .text : { /* Real text segment */ _stext = .; /* Text and read-only data */ ARM_TEXT @@ -143,6 +147,9 @@ SECTIONS _edata = .; BSS_SECTION(0, 0, 0) +#ifdef CONFIG_ARM_MPU + . = ALIGN(PMSAv8_MINALIGN); +#endif _end = .; STABS_DEBUG |