arch/arm/include/asm/mpu.h

   1 #ifndef __ARM_MPU_H
   2 #define __ARM_MPU_H
   3
   4 #ifdef CONFIG_ARM_MPU
   5
   6 /* MPUIR layout */
   7 #define MPUIR_nU                1
   8 #define MPUIR_DREGION           8
   9 #define MPUIR_IREGION           16
  10 #define MPUIR_DREGION_SZMASK    (0xFF << MPUIR_DREGION)
  11 #define MPUIR_IREGION_SZMASK    (0xFF << MPUIR_IREGION)
  12
  13 /* ID_MMFR0 data relevant to MPU */
  14 #define MMFR0_PMSA              (0xF << 4)
  15 #define MMFR0_PMSAv7            (3 << 4)
  16
  17 /* MPU D/I Size Register fields */
  18 #define MPU_RSR_SZ              1
  19 #define MPU_RSR_EN              0
  20
  21 /* The D/I RSR value for an enabled region spanning the whole of memory */
  22 #define MPU_RSR_ALL_MEM         63
  23
  24 /* Individual bits in the DR/IR ACR */
  25 #define MPU_ACR_XN              (1 << 12)
  26 #define MPU_ACR_SHARED          (1 << 2)
  27
  28 /* C, B and TEX[2:0] bits only have semantic meanings when grouped */
  29 #define MPU_RGN_CACHEABLE       0xB
  30 #define MPU_RGN_SHARED_CACHEABLE (MPU_RGN_CACHEABLE | MPU_ACR_SHARED)
  31 #define MPU_RGN_STRONGLY_ORDERED 0
  32
  33 /* Main region should only be shared for SMP */
  34 #ifdef CONFIG_SMP
  35 #define MPU_RGN_NORMAL          (MPU_RGN_CACHEABLE | MPU_ACR_SHARED)
  36 #else
  37 #define MPU_RGN_NORMAL          MPU_RGN_CACHEABLE
  38 #endif
  39
  40 /* Access permission bits of ACR (only define those that we use)*/
  41 #define MPU_AP_PL1RW_PL0RW      (0x3 << 8)
  42 #define MPU_AP_PL1RW_PL0R0      (0x2 << 8)
  43 #define MPU_AP_PL1RW_PL0NA      (0x1 << 8)
  44
  45 /* For minimal static MPU region configurations */
  46 #define MPU_PROBE_REGION        0
  47 #define MPU_BG_REGION           1
  48 #define MPU_RAM_REGION          2
  49 #define MPU_VECTORS_REGION      3
  50
  51 /* Maximum number of regions Linux is interested in */
  52 #define MPU_MAX_REGIONS         16
  53
  54 #define MPU_DATA_SIDE           0
  55 #define MPU_INSTR_SIDE          1
  56
  57 #ifndef __ASSEMBLY__
  58
  59 struct mpu_rgn {
  60         /* Assume same attributes for d/i-side  */
  61         u32 drbar;
  62         u32 drsr;
  63         u32 dracr;
  64 };
  65
  66 struct mpu_rgn_info {
  67         u32 mpuir;
  68         struct mpu_rgn rgns[MPU_MAX_REGIONS];
  69 };
  70 extern struct mpu_rgn_info mpu_rgn_info;
  71
  72 #endif /* __ASSEMBLY__ */
  73
  74 #endif /* CONFIG_ARM_MPU */
  75
  76 #endif