92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ARM_MPU_H
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#define __ARM_MPU_H
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/* MPUIR layout */
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#define MPUIR_nU 1
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#define MPUIR_DREGION 8
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#define MPUIR_IREGION 16
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#define MPUIR_DREGION_SZMASK (0xFF << MPUIR_DREGION)
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#define MPUIR_IREGION_SZMASK (0xFF << MPUIR_IREGION)
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/* ID_MMFR0 data relevant to MPU */
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#define MMFR0_PMSA (0xF << 4)
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#define MMFR0_PMSAv7 (3 << 4)
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/* MPU D/I Size Register fields */
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#define MPU_RSR_SZ 1
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#define MPU_RSR_EN 0
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#define MPU_RSR_SD 8
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/* Number of subregions (SD) */
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#define MPU_NR_SUBREGS 8
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#define MPU_MIN_SUBREG_SIZE 256
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/* The D/I RSR value for an enabled region spanning the whole of memory */
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#define MPU_RSR_ALL_MEM 63
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/* Individual bits in the DR/IR ACR */
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#define MPU_ACR_XN (1 << 12)
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#define MPU_ACR_SHARED (1 << 2)
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/* C, B and TEX[2:0] bits only have semantic meanings when grouped */
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#define MPU_RGN_CACHEABLE 0xB
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#define MPU_RGN_SHARED_CACHEABLE (MPU_RGN_CACHEABLE | MPU_ACR_SHARED)
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#define MPU_RGN_STRONGLY_ORDERED 0
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/* Main region should only be shared for SMP */
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#ifdef CONFIG_SMP
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#define MPU_RGN_NORMAL (MPU_RGN_CACHEABLE | MPU_ACR_SHARED)
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#else
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#define MPU_RGN_NORMAL MPU_RGN_CACHEABLE
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#endif
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/* Access permission bits of ACR (only define those that we use)*/
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#define MPU_AP_PL1RO_PL0NA (0x5 << 8)
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#define MPU_AP_PL1RW_PL0RW (0x3 << 8)
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#define MPU_AP_PL1RW_PL0R0 (0x2 << 8)
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#define MPU_AP_PL1RW_PL0NA (0x1 << 8)
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/* For minimal static MPU region configurations */
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#define MPU_PROBE_REGION 0
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#define MPU_BG_REGION 1
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#define MPU_RAM_REGION 2
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#define MPU_ROM_REGION 3
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/* Maximum number of regions Linux is interested in */
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#define MPU_MAX_REGIONS 16
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#define MPU_DATA_SIDE 0
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#define MPU_INSTR_SIDE 1
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#ifndef __ASSEMBLY__
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struct mpu_rgn {
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/* Assume same attributes for d/i-side */
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u32 drbar;
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u32 drsr;
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u32 dracr;
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};
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struct mpu_rgn_info {
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unsigned int used;
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struct mpu_rgn rgns[MPU_MAX_REGIONS];
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};
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extern struct mpu_rgn_info mpu_rgn_info;
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#ifdef CONFIG_ARM_MPU
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extern void __init adjust_lowmem_bounds_mpu(void);
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extern void __init mpu_setup(void);
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#else
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static inline void adjust_lowmem_bounds_mpu(void) {}
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static inline void mpu_setup(void) {}
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#endif /* !CONFIG_ARM_MPU */
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#endif /* __ASSEMBLY__ */
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#endif
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