arch/arm/include/asm/mpu.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ARM_MPU_H
   3 #define __ARM_MPU_H
   4
   5 /* MPUIR layout */
   6 #define MPUIR_nU                1
   7 #define MPUIR_DREGION           8
   8 #define MPUIR_IREGION           16
   9 #define MPUIR_DREGION_SZMASK    (0xFF << MPUIR_DREGION)
  10 #define MPUIR_IREGION_SZMASK    (0xFF << MPUIR_IREGION)
  11
  12 /* ID_MMFR0 data relevant to MPU */
  13 #define MMFR0_PMSA              (0xF << 4)
  14 #define MMFR0_PMSAv7            (3 << 4)
  15 #define MMFR0_PMSAv8            (4 << 4)
  16
  17 /* MPU D/I Size Register fields */
  18 #define PMSAv7_RSR_SZ           1
  19 #define PMSAv7_RSR_EN           0
  20 #define PMSAv7_RSR_SD           8
  21
  22 /* Number of subregions (SD) */
  23 #define PMSAv7_NR_SUBREGS       8
  24 #define PMSAv7_MIN_SUBREG_SIZE  256
  25
  26 /* The D/I RSR value for an enabled region spanning the whole of memory */
  27 #define PMSAv7_RSR_ALL_MEM      63
  28
  29 /* Individual bits in the DR/IR ACR */
  30 #define PMSAv7_ACR_XN           (1 << 12)
  31 #define PMSAv7_ACR_SHARED       (1 << 2)
  32
  33 /* C, B and TEX[2:0] bits only have semantic meanings when grouped */
  34 #define PMSAv7_RGN_CACHEABLE            0xB
  35 #define PMSAv7_RGN_SHARED_CACHEABLE     (PMSAv7_RGN_CACHEABLE | PMSAv7_ACR_SHARED)
  36 #define PMSAv7_RGN_STRONGLY_ORDERED     0
  37
  38 /* Main region should only be shared for SMP */
  39 #ifdef CONFIG_SMP
  40 #define PMSAv7_RGN_NORMAL       (PMSAv7_RGN_CACHEABLE | PMSAv7_ACR_SHARED)
  41 #else
  42 #define PMSAv7_RGN_NORMAL       PMSAv7_RGN_CACHEABLE
  43 #endif
  44
  45 /* Access permission bits of ACR (only define those that we use)*/
  46 #define PMSAv7_AP_PL1RO_PL0NA   (0x5 << 8)
  47 #define PMSAv7_AP_PL1RW_PL0RW   (0x3 << 8)
  48 #define PMSAv7_AP_PL1RW_PL0R0   (0x2 << 8)
  49 #define PMSAv7_AP_PL1RW_PL0NA   (0x1 << 8)
  50
  51 #define PMSAv8_BAR_XN           1
  52
  53 #define PMSAv8_LAR_EN           1
  54 #define PMSAv8_LAR_IDX(n)       (((n) & 0x7) << 1)
  55
  56
  57 #define PMSAv8_AP_PL1RW_PL0NA   (0 << 1)
  58 #define PMSAv8_AP_PL1RW_PL0RW   (1 << 1)
  59 #define PMSAv8_AP_PL1RO_PL0RO   (3 << 1)
  60
  61 #ifdef CONFIG_SMP
  62 #define PMSAv8_RGN_SHARED       (3 << 3) // inner sharable
  63 #else
  64 #define PMSAv8_RGN_SHARED       (0 << 3)
  65 #endif
  66
  67 #define PMSAv8_RGN_DEVICE_nGnRnE        0
  68 #define PMSAv8_RGN_NORMAL               1
  69
  70 #define PMSAv8_MAIR(attr, mt)   ((attr) << ((mt) * 8))
  71
  72 #ifdef CONFIG_CPU_V7M
  73 #define PMSAv8_MINALIGN         32
  74 #else
  75 #define PMSAv8_MINALIGN         64
  76 #endif
  77
  78 /* For minimal static MPU region configurations */
  79 #define PMSAv7_PROBE_REGION     0
  80 #define PMSAv7_BG_REGION        1
  81 #define PMSAv7_RAM_REGION       2
  82 #define PMSAv7_ROM_REGION       3
  83
  84 /* Fixed for PMSAv8 only */
  85 #define PMSAv8_XIP_REGION       0
  86 #define PMSAv8_KERNEL_REGION    1
  87
  88 /* Maximum number of regions Linux is interested in */
  89 #define MPU_MAX_REGIONS 16
  90
  91 #define PMSAv7_DATA_SIDE        0
  92 #define PMSAv7_INSTR_SIDE       1
  93
  94 #ifndef __ASSEMBLY__
  95
  96 struct mpu_rgn {
  97         /* Assume same attributes for d/i-side  */
  98         union {
  99                 u32 drbar;   /* PMSAv7 */
 100                 u32 prbar;   /* PMSAv8 */
 101         };
 102         union {
 103                 u32 drsr;   /* PMSAv7 */
 104                 u32 prlar;  /* PMSAv8 */
 105         };
 106         union {
 107                 u32 dracr;  /* PMSAv7 */
 108                 u32 unused; /* not used in PMSAv8 */
 109         };
 110 };
 111
 112 struct mpu_rgn_info {
 113         unsigned int used;
 114         struct mpu_rgn rgns[MPU_MAX_REGIONS];
 115 };
 116 extern struct mpu_rgn_info mpu_rgn_info;
 117
 118 #ifdef CONFIG_ARM_MPU
 119 extern void __init pmsav7_adjust_lowmem_bounds(void);
 120 extern void __init pmsav8_adjust_lowmem_bounds(void);
 121
 122 extern void __init pmsav7_setup(void);
 123 extern void __init pmsav8_setup(void);
 124 #else
 125 static inline void pmsav7_adjust_lowmem_bounds(void) {};
 126 static inline void pmsav8_adjust_lowmem_bounds(void) {};
 127 static inline void pmsav7_setup(void) {};
 128 static inline void pmsav8_setup(void) {};
 129 #endif
 130
 131 #endif /* __ASSEMBLY__ */
 132
 133 #endif