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
134
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