mpu.h 3.2 KB

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