LXR linux/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
  96struct 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
 112struct mpu_rgn_info {
 113        unsigned int used;
 114        struct mpu_rgn rgns[MPU_MAX_REGIONS];
 115};
 116extern struct mpu_rgn_info mpu_rgn_info;
 117
 118#ifdef CONFIG_ARM_MPU
 119extern void __init pmsav7_adjust_lowmem_bounds(void);
 120extern void __init pmsav8_adjust_lowmem_bounds(void);
 121
 122extern void __init pmsav7_setup(void);
 123extern void __init pmsav8_setup(void);
 124#else
 125static inline void pmsav7_adjust_lowmem_bounds(void) {};
 126static inline void pmsav8_adjust_lowmem_bounds(void) {};
 127static inline void pmsav7_setup(void) {};
 128static inline void pmsav8_setup(void) {};
 129#endif
 130
 131#endif /* __ASSEMBLY__ */
 132
 133#endif
 134