diff options
Diffstat (limited to 'arch/arm/include/asm/mpu.h')
-rw-r--r-- | arch/arm/include/asm/mpu.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/arch/arm/include/asm/mpu.h b/arch/arm/include/asm/mpu.h new file mode 100644 index 0000000000..5e088c83d3 --- /dev/null +++ b/arch/arm/include/asm/mpu.h @@ -0,0 +1,133 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ARM_MPU_H +#define __ARM_MPU_H + +/* MPUIR layout */ +#define MPUIR_nU 1 +#define MPUIR_DREGION 8 +#define MPUIR_IREGION 16 +#define MPUIR_DREGION_SZMASK (0xFF << MPUIR_DREGION) +#define MPUIR_IREGION_SZMASK (0xFF << MPUIR_IREGION) + +/* ID_MMFR0 data relevant to MPU */ +#define MMFR0_PMSA (0xF << 4) +#define MMFR0_PMSAv7 (3 << 4) +#define MMFR0_PMSAv8 (4 << 4) + +/* MPU D/I Size Register fields */ +#define PMSAv7_RSR_SZ 1 +#define PMSAv7_RSR_EN 0 +#define PMSAv7_RSR_SD 8 + +/* Number of subregions (SD) */ +#define PMSAv7_NR_SUBREGS 8 +#define PMSAv7_MIN_SUBREG_SIZE 256 + +/* The D/I RSR value for an enabled region spanning the whole of memory */ +#define PMSAv7_RSR_ALL_MEM 63 + +/* Individual bits in the DR/IR ACR */ +#define PMSAv7_ACR_XN (1 << 12) +#define PMSAv7_ACR_SHARED (1 << 2) + +/* C, B and TEX[2:0] bits only have semantic meanings when grouped */ +#define PMSAv7_RGN_CACHEABLE 0xB +#define PMSAv7_RGN_SHARED_CACHEABLE (PMSAv7_RGN_CACHEABLE | PMSAv7_ACR_SHARED) +#define PMSAv7_RGN_STRONGLY_ORDERED 0 + +/* Main region should only be shared for SMP */ +#ifdef CONFIG_SMP +#define PMSAv7_RGN_NORMAL (PMSAv7_RGN_CACHEABLE | PMSAv7_ACR_SHARED) +#else +#define PMSAv7_RGN_NORMAL PMSAv7_RGN_CACHEABLE +#endif + +/* Access permission bits of ACR (only define those that we use)*/ +#define PMSAv7_AP_PL1RO_PL0NA (0x5 << 8) +#define PMSAv7_AP_PL1RW_PL0RW (0x3 << 8) +#define PMSAv7_AP_PL1RW_PL0R0 (0x2 << 8) +#define PMSAv7_AP_PL1RW_PL0NA (0x1 << 8) + +#define PMSAv8_BAR_XN 1 + +#define PMSAv8_LAR_EN 1 +#define PMSAv8_LAR_IDX(n) (((n) & 0x7) << 1) + + +#define PMSAv8_AP_PL1RW_PL0NA (0 << 1) +#define PMSAv8_AP_PL1RW_PL0RW (1 << 1) +#define PMSAv8_AP_PL1RO_PL0RO (3 << 1) + +#ifdef CONFIG_SMP +#define PMSAv8_RGN_SHARED (3 << 3) // inner sharable +#else +#define PMSAv8_RGN_SHARED (0 << 3) +#endif + +#define PMSAv8_RGN_DEVICE_nGnRnE 0 +#define PMSAv8_RGN_NORMAL 1 + +#define PMSAv8_MAIR(attr, mt) ((attr) << ((mt) * 8)) + +#ifdef CONFIG_CPU_V7M +#define PMSAv8_MINALIGN 32 +#else +#define PMSAv8_MINALIGN 64 +#endif + +/* For minimal static MPU region configurations */ +#define PMSAv7_PROBE_REGION 0 +#define PMSAv7_BG_REGION 1 +#define PMSAv7_RAM_REGION 2 +#define PMSAv7_ROM_REGION 3 + +/* Fixed for PMSAv8 only */ +#define PMSAv8_XIP_REGION 0 +#define PMSAv8_KERNEL_REGION 1 + +/* Maximum number of regions Linux is interested in */ +#define MPU_MAX_REGIONS 16 + +#define PMSAv7_DATA_SIDE 0 +#define PMSAv7_INSTR_SIDE 1 + +#ifndef __ASSEMBLY__ + +struct mpu_rgn { + /* Assume same attributes for d/i-side */ + union { + u32 drbar; /* PMSAv7 */ + u32 prbar; /* PMSAv8 */ + }; + union { + u32 drsr; /* PMSAv7 */ + u32 prlar; /* PMSAv8 */ + }; + union { + u32 dracr; /* PMSAv7 */ + u32 unused; /* not used in PMSAv8 */ + }; +}; + +struct mpu_rgn_info { + unsigned int used; + struct mpu_rgn rgns[MPU_MAX_REGIONS]; +}; +extern struct mpu_rgn_info mpu_rgn_info; + +#ifdef CONFIG_ARM_MPU +extern void __init pmsav7_adjust_lowmem_bounds(void); +extern void __init pmsav8_adjust_lowmem_bounds(void); + +extern void __init pmsav7_setup(void); +extern void __init pmsav8_setup(void); +#else +static inline void pmsav7_adjust_lowmem_bounds(void) {}; +static inline void pmsav8_adjust_lowmem_bounds(void) {}; +static inline void pmsav7_setup(void) {}; +static inline void pmsav8_setup(void) {}; +#endif + +#endif /* __ASSEMBLY__ */ + +#endif |