include/asm/mpu.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef __ARM_MPU_H
0003 #define __ARM_MPU_H
0004
0005 /* MPUIR layout */
0006 #define MPUIR_nU        1
0007 #define MPUIR_DREGION       8
0008 #define MPUIR_IREGION       16
0009 #define MPUIR_DREGION_SZMASK    (0xFF << MPUIR_DREGION)
0010 #define MPUIR_IREGION_SZMASK    (0xFF << MPUIR_IREGION)
0011
0012 /* ID_MMFR0 data relevant to MPU */
0013 #define MMFR0_PMSA      (0xF << 4)
0014 #define MMFR0_PMSAv7        (3 << 4)
0015 #define MMFR0_PMSAv8        (4 << 4)
0016
0017 /* MPU D/I Size Register fields */
0018 #define PMSAv7_RSR_SZ       1
0019 #define PMSAv7_RSR_EN       0
0020 #define PMSAv7_RSR_SD       8
0021
0022 /* Number of subregions (SD) */
0023 #define PMSAv7_NR_SUBREGS   8
0024 #define PMSAv7_MIN_SUBREG_SIZE  256
0025
0026 /* The D/I RSR value for an enabled region spanning the whole of memory */
0027 #define PMSAv7_RSR_ALL_MEM  63
0028
0029 /* Individual bits in the DR/IR ACR */
0030 #define PMSAv7_ACR_XN       (1 << 12)
0031 #define PMSAv7_ACR_SHARED   (1 << 2)
0032
0033 /* C, B and TEX[2:0] bits only have semantic meanings when grouped */
0034 #define PMSAv7_RGN_CACHEABLE        0xB
0035 #define PMSAv7_RGN_SHARED_CACHEABLE (PMSAv7_RGN_CACHEABLE | PMSAv7_ACR_SHARED)
0036 #define PMSAv7_RGN_STRONGLY_ORDERED 0
0037
0038 /* Main region should only be shared for SMP */
0039 #ifdef CONFIG_SMP
0040 #define PMSAv7_RGN_NORMAL   (PMSAv7_RGN_CACHEABLE | PMSAv7_ACR_SHARED)
0041 #else
0042 #define PMSAv7_RGN_NORMAL   PMSAv7_RGN_CACHEABLE
0043 #endif
0044
0045 /* Access permission bits of ACR (only define those that we use)*/
0046 #define PMSAv7_AP_PL1RO_PL0NA   (0x5 << 8)
0047 #define PMSAv7_AP_PL1RW_PL0RW   (0x3 << 8)
0048 #define PMSAv7_AP_PL1RW_PL0R0   (0x2 << 8)
0049 #define PMSAv7_AP_PL1RW_PL0NA   (0x1 << 8)
0050
0051 #define PMSAv8_BAR_XN       1
0052
0053 #define PMSAv8_LAR_EN       1
0054 #define PMSAv8_LAR_IDX(n)   (((n) & 0x7) << 1)
0055
0056
0057 #define PMSAv8_AP_PL1RW_PL0NA   (0 << 1)
0058 #define PMSAv8_AP_PL1RW_PL0RW   (1 << 1)
0059 #define PMSAv8_AP_PL1RO_PL0RO   (3 << 1)
0060
0061 #ifdef CONFIG_SMP
0062 #define PMSAv8_RGN_SHARED   (3 << 3) // inner sharable
0063 #else
0064 #define PMSAv8_RGN_SHARED   (0 << 3)
0065 #endif
0066
0067 #define PMSAv8_RGN_DEVICE_nGnRnE    0
0068 #define PMSAv8_RGN_NORMAL       1
0069
0070 #define PMSAv8_MAIR(attr, mt)   ((attr) << ((mt) * 8))
0071
0072 #ifdef CONFIG_CPU_V7M
0073 #define PMSAv8_MINALIGN     32
0074 #else
0075 #define PMSAv8_MINALIGN     64
0076 #endif
0077
0078 /* For minimal static MPU region configurations */
0079 #define PMSAv7_PROBE_REGION 0
0080 #define PMSAv7_BG_REGION    1
0081 #define PMSAv7_RAM_REGION   2
0082 #define PMSAv7_ROM_REGION   3
0083
0084 /* Fixed for PMSAv8 only */
0085 #define PMSAv8_XIP_REGION   0
0086 #define PMSAv8_KERNEL_REGION    1
0087
0088 /* Maximum number of regions Linux is interested in */
0089 #define MPU_MAX_REGIONS 16
0090
0091 #define PMSAv7_DATA_SIDE    0
0092 #define PMSAv7_INSTR_SIDE   1
0093
0094 #ifndef __ASSEMBLY__
0095
0096 struct mpu_rgn {
0097     /* Assume same attributes for d/i-side  */
0098     union {
0099         u32 drbar;   /* PMSAv7 */
0100         u32 prbar;   /* PMSAv8 */
0101     };
0102     union {
0103         u32 drsr;   /* PMSAv7 */
0104         u32 prlar;  /* PMSAv8 */
0105     };
0106     union {
0107         u32 dracr;  /* PMSAv7 */
0108         u32 unused; /* not used in PMSAv8 */
0109     };
0110 };
0111
0112 struct mpu_rgn_info {
0113     unsigned int used;
0114     struct mpu_rgn rgns[MPU_MAX_REGIONS];
0115 };
0116 extern struct mpu_rgn_info mpu_rgn_info;
0117
0118 #ifdef CONFIG_ARM_MPU
0119 extern void __init pmsav7_adjust_lowmem_bounds(void);
0120 extern void __init pmsav8_adjust_lowmem_bounds(void);
0121
0122 extern void __init pmsav7_setup(void);
0123 extern void __init pmsav8_setup(void);
0124 #else
0125 static inline void pmsav7_adjust_lowmem_bounds(void) {};
0126 static inline void pmsav8_adjust_lowmem_bounds(void) {};
0127 static inline void pmsav7_setup(void) {};
0128 static inline void pmsav8_setup(void) {};
0129 #endif
0130
0131 #endif /* __ASSEMBLY__ */
0132
0133 #endif