1 /* 2 * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #ifndef __XLAT_TABLES_V2_H__ 8 #define __XLAT_TABLES_V2_H__ 9 10 #include <xlat_tables_defs.h> 11 12 #ifndef __ASSEMBLY__ 13 #include <stddef.h> 14 #include <stdint.h> 15 #include <xlat_mmu_helpers.h> 16 17 /* Helper macro to define entries for mmap_region_t. It creates 18 * identity mappings for each region. 19 */ 20 #define MAP_REGION_FLAT(adr, sz, attr) MAP_REGION(adr, adr, sz, attr) 21 22 /* Helper macro to define entries for mmap_region_t. It allows to 23 * re-map address mappings from 'pa' to 'va' for each region. 24 */ 25 #define MAP_REGION(pa, va, sz, attr) {(pa), (va), (sz), (attr)} 26 27 /* 28 * Shifts and masks to access fields of an mmap_attr_t 29 */ 30 #define MT_TYPE_MASK 0x7 31 #define MT_TYPE(_attr) ((_attr) & MT_TYPE_MASK) 32 /* Access permissions (RO/RW) */ 33 #define MT_PERM_SHIFT 3 34 /* Security state (SECURE/NS) */ 35 #define MT_SEC_SHIFT 4 36 /* Access permissions for instruction execution (EXECUTE/EXECUTE_NEVER) */ 37 #define MT_EXECUTE_SHIFT 5 38 /* All other bits are reserved */ 39 40 /* 41 * Memory mapping attributes 42 */ 43 typedef enum { 44 /* 45 * Memory types supported. 46 * These are organised so that, going down the list, the memory types 47 * are getting weaker; conversely going up the list the memory types are 48 * getting stronger. 49 */ 50 MT_DEVICE, 51 MT_NON_CACHEABLE, 52 MT_MEMORY, 53 /* Values up to 7 are reserved to add new memory types in the future */ 54 55 MT_RO = 0 << MT_PERM_SHIFT, 56 MT_RW = 1 << MT_PERM_SHIFT, 57 58 MT_SECURE = 0 << MT_SEC_SHIFT, 59 MT_NS = 1 << MT_SEC_SHIFT, 60 61 /* 62 * Access permissions for instruction execution are only relevant for 63 * normal read-only memory, i.e. MT_MEMORY | MT_RO. They are ignored 64 * (and potentially overridden) otherwise: 65 * - Device memory is always marked as execute-never. 66 * - Read-write normal memory is always marked as execute-never. 67 */ 68 MT_EXECUTE = 0 << MT_EXECUTE_SHIFT, 69 MT_EXECUTE_NEVER = 1 << MT_EXECUTE_SHIFT, 70 } mmap_attr_t; 71 72 #define MT_CODE (MT_MEMORY | MT_RO | MT_EXECUTE) 73 #define MT_RO_DATA (MT_MEMORY | MT_RO | MT_EXECUTE_NEVER) 74 75 /* 76 * Structure for specifying a single region of memory. 77 */ 78 typedef struct mmap_region { 79 unsigned long long base_pa; 80 uintptr_t base_va; 81 size_t size; 82 mmap_attr_t attr; 83 } mmap_region_t; 84 85 /* Generic translation table APIs */ 86 void init_xlat_tables(void); 87 88 /* 89 * Add a region with defined base PA and base VA. This type of region can only 90 * be added before initializing the MMU and cannot be removed later. 91 */ 92 void mmap_add_region(unsigned long long base_pa, uintptr_t base_va, 93 size_t size, mmap_attr_t attr); 94 95 /* 96 * Add a region with defined base PA and base VA. This type of region can be 97 * added and removed even if the MMU is enabled. 98 * 99 * Returns: 100 * 0: Success. 101 * EINVAL: Invalid values were used as arguments. 102 * ERANGE: Memory limits were surpassed. 103 * ENOMEM: Not enough space in the mmap array or not enough free xlat tables. 104 * EPERM: It overlaps another region in an invalid way. 105 */ 106 int mmap_add_dynamic_region(unsigned long long base_pa, uintptr_t base_va, 107 size_t size, mmap_attr_t attr); 108 109 /* 110 * Add an array of static regions with defined base PA and base VA. This type 111 * of region can only be added before initializing the MMU and cannot be 112 * removed later. 113 */ 114 void mmap_add(const mmap_region_t *mm); 115 116 /* 117 * Remove a region with the specified base VA and size. Only dynamic regions can 118 * be removed, and they can be removed even if the MMU is enabled. 119 * 120 * Returns: 121 * 0: Success. 122 * EINVAL: The specified region wasn't found. 123 * EPERM: Trying to remove a static region. 124 */ 125 int mmap_remove_dynamic_region(uintptr_t base_va, size_t size); 126 127 #endif /*__ASSEMBLY__*/ 128 #endif /* __XLAT_TABLES_V2_H__ */ 129