1 files changed, 133 insertions, 0 deletions
diff --git a/arch/arm/include/asm/mpu.h b/arch/arm/include/asm/mpu.h
new file mode 100644
index 000000000..5e088c83d
--- /dev/null
+++ b/arch/arm/include/asm/mpu.h
@@ -0,0 +1,133 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ARM_MPU_H
+#define __ARM_MPU_H
+
+/* MPUIR layout */
+#define MPUIR_nU		1
+#define MPUIR_DREGION		8
+#define MPUIR_IREGION		16
+#define MPUIR_DREGION_SZMASK	(0xFF << MPUIR_DREGION)
+#define MPUIR_IREGION_SZMASK	(0xFF << MPUIR_IREGION)
+
+/* ID_MMFR0 data relevant to MPU */
+#define MMFR0_PMSA		(0xF << 4)
+#define MMFR0_PMSAv7		(3 << 4)
+#define MMFR0_PMSAv8		(4 << 4)
+
+/* MPU D/I Size Register fields */
+#define PMSAv7_RSR_SZ		1
+#define PMSAv7_RSR_EN		0
+#define PMSAv7_RSR_SD		8
+
+/* Number of subregions (SD) */
+#define PMSAv7_NR_SUBREGS	8
+#define PMSAv7_MIN_SUBREG_SIZE	256
+
+/* The D/I RSR value for an enabled region spanning the whole of memory */
+#define PMSAv7_RSR_ALL_MEM	63
+
+/* Individual bits in the DR/IR ACR */
+#define PMSAv7_ACR_XN		(1 << 12)
+#define PMSAv7_ACR_SHARED	(1 << 2)
+
+/* C, B and TEX[2:0] bits only have semantic meanings when grouped */
+#define PMSAv7_RGN_CACHEABLE		0xB
+#define PMSAv7_RGN_SHARED_CACHEABLE	(PMSAv7_RGN_CACHEABLE | PMSAv7_ACR_SHARED)
+#define PMSAv7_RGN_STRONGLY_ORDERED	0
+
+/* Main region should only be shared for SMP */
+#ifdef CONFIG_SMP
+#define PMSAv7_RGN_NORMAL	(PMSAv7_RGN_CACHEABLE | PMSAv7_ACR_SHARED)
+#else
+#define PMSAv7_RGN_NORMAL	PMSAv7_RGN_CACHEABLE
+#endif
+
+/* Access permission bits of ACR (only define those that we use)*/
+#define PMSAv7_AP_PL1RO_PL0NA	(0x5 << 8)
+#define PMSAv7_AP_PL1RW_PL0RW	(0x3 << 8)
+#define PMSAv7_AP_PL1RW_PL0R0	(0x2 << 8)
+#define PMSAv7_AP_PL1RW_PL0NA	(0x1 << 8)
+
+#define PMSAv8_BAR_XN		1
+
+#define PMSAv8_LAR_EN		1
+#define PMSAv8_LAR_IDX(n)	(((n) & 0x7) << 1)
+
+
+#define PMSAv8_AP_PL1RW_PL0NA	(0 << 1)
+#define PMSAv8_AP_PL1RW_PL0RW	(1 << 1)
+#define PMSAv8_AP_PL1RO_PL0RO	(3 << 1)
+
+#ifdef CONFIG_SMP
+#define PMSAv8_RGN_SHARED	(3 << 3) // inner sharable
+#else
+#define PMSAv8_RGN_SHARED	(0 << 3)
+#endif
+
+#define PMSAv8_RGN_DEVICE_nGnRnE	0
+#define PMSAv8_RGN_NORMAL		1
+
+#define PMSAv8_MAIR(attr, mt)	((attr) << ((mt) * 8))
+
+#ifdef CONFIG_CPU_V7M
+#define PMSAv8_MINALIGN		32
+#else
+#define PMSAv8_MINALIGN		64
+#endif
+
+/* For minimal static MPU region configurations */
+#define PMSAv7_PROBE_REGION	0
+#define PMSAv7_BG_REGION	1
+#define PMSAv7_RAM_REGION	2
+#define PMSAv7_ROM_REGION	3
+
+/* Fixed for PMSAv8 only */
+#define PMSAv8_XIP_REGION	0
+#define PMSAv8_KERNEL_REGION	1
+
+/* Maximum number of regions Linux is interested in */
+#define MPU_MAX_REGIONS	16
+
+#define PMSAv7_DATA_SIDE	0
+#define PMSAv7_INSTR_SIDE	1
+
+#ifndef __ASSEMBLY__
+
+struct mpu_rgn {
+	/* Assume same attributes for d/i-side  */
+	union {
+		u32 drbar;   /* PMSAv7 */
+		u32 prbar;   /* PMSAv8 */
+	};
+	union {
+		u32 drsr;   /* PMSAv7 */
+		u32 prlar;  /* PMSAv8 */
+	};
+	union {
+		u32 dracr;  /* PMSAv7 */
+		u32 unused; /* not used in PMSAv8 */
+	};
+};
+
+struct mpu_rgn_info {
+	unsigned int used;
+	struct mpu_rgn rgns[MPU_MAX_REGIONS];
+};
+extern struct mpu_rgn_info mpu_rgn_info;
+
+#ifdef CONFIG_ARM_MPU
+extern void __init pmsav7_adjust_lowmem_bounds(void);
+extern void __init pmsav8_adjust_lowmem_bounds(void);
+
+extern void __init pmsav7_setup(void);
+extern void __init pmsav8_setup(void);
+#else
+static inline void pmsav7_adjust_lowmem_bounds(void) {};
+static inline void pmsav8_adjust_lowmem_bounds(void) {};
+static inline void pmsav7_setup(void) {};
+static inline void pmsav8_setup(void) {};
+#endif
+
+#endif /* __ASSEMBLY__ */
+
+#endif