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| -rw-r--r-- | include/lib/xlat_tables/xlat_tables_v2.h | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/include/lib/xlat_tables/xlat_tables_v2.h b/include/lib/xlat_tables/xlat_tables_v2.h new file mode 100644 index 0000000..69ad027 --- /dev/null +++ b/include/lib/xlat_tables/xlat_tables_v2.h @@ -0,0 +1,416 @@ +/* + * Copyright (c) 2017-2021, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#ifndef XLAT_TABLES_V2_H +#define XLAT_TABLES_V2_H + +#include <lib/xlat_tables/xlat_tables_defs.h> +#include <lib/xlat_tables/xlat_tables_v2_helpers.h> + +#ifndef __ASSEMBLER__ +#include <stddef.h> +#include <stdint.h> + +#include <lib/xlat_tables/xlat_mmu_helpers.h> + +/* + * Default granularity size for an mmap_region_t. + * Useful when no specific granularity is required. + * + * By default, choose the biggest possible block size allowed by the + * architectural state and granule size in order to minimize the number of page + * tables required for the mapping. + */ +#define REGION_DEFAULT_GRANULARITY XLAT_BLOCK_SIZE(MIN_LVL_BLOCK_DESC) + +/* Helper macro to define an mmap_region_t. */ +#define MAP_REGION(_pa, _va, _sz, _attr) \ + MAP_REGION_FULL_SPEC(_pa, _va, _sz, _attr, REGION_DEFAULT_GRANULARITY) + +/* Helper macro to define an mmap_region_t with an identity mapping. */ +#define MAP_REGION_FLAT(_adr, _sz, _attr) \ + MAP_REGION(_adr, _adr, _sz, _attr) + +/* + * Helper macro to define entries for mmap_region_t. It allows to define 'pa' + * and sets 'va' to 0 for each region. To be used with mmap_add_alloc_va(). + */ +#define MAP_REGION_ALLOC_VA(pa, sz, attr) MAP_REGION(pa, 0, sz, attr) + +/* + * Helper macro to define an mmap_region_t to map with the desired granularity + * of translation tables. + * + * The granularity value passed to this macro must be a valid block or page + * size. When using a 4KB translation granule, this might be 4KB, 2MB or 1GB. + * Passing REGION_DEFAULT_GRANULARITY is also allowed and means that the library + * is free to choose the granularity for this region. In this case, it is + * equivalent to the MAP_REGION() macro. + */ +#define MAP_REGION2(_pa, _va, _sz, _attr, _gr) \ + MAP_REGION_FULL_SPEC(_pa, _va, _sz, _attr, _gr) + +/* + * Shifts and masks to access fields of an mmap attribute + */ +#define MT_TYPE_MASK U(0x7) +#define MT_TYPE(_attr) ((_attr) & MT_TYPE_MASK) +/* Access permissions (RO/RW) */ +#define MT_PERM_SHIFT U(3) + +/* Physical address space (SECURE/NS/Root/Realm) */ +#define MT_PAS_SHIFT U(4) +#define MT_PAS_MASK (U(3) << MT_PAS_SHIFT) +#define MT_PAS(_attr) ((_attr) & MT_PAS_MASK) + +/* Access permissions for instruction execution (EXECUTE/EXECUTE_NEVER) */ +#define MT_EXECUTE_SHIFT U(6) +/* In the EL1&0 translation regime, User (EL0) or Privileged (EL1). */ +#define MT_USER_SHIFT U(7) + +/* Shareability attribute for the memory region */ +#define MT_SHAREABILITY_SHIFT U(8) +#define MT_SHAREABILITY_MASK (U(3) << MT_SHAREABILITY_SHIFT) +#define MT_SHAREABILITY(_attr) ((_attr) & MT_SHAREABILITY_MASK) + +/* All other bits are reserved */ + +/* + * Memory mapping attributes + */ + +/* + * Memory types supported. + * These are organised so that, going down the list, the memory types are + * getting weaker; conversely going up the list the memory types are getting + * stronger. + */ +#define MT_DEVICE U(0) +#define MT_NON_CACHEABLE U(1) +#define MT_MEMORY U(2) +/* Values up to 7 are reserved to add new memory types in the future */ + +#define MT_RO (U(0) << MT_PERM_SHIFT) +#define MT_RW (U(1) << MT_PERM_SHIFT) + +#define MT_SECURE (U(0) << MT_PAS_SHIFT) +#define MT_NS (U(1) << MT_PAS_SHIFT) +#define MT_ROOT (U(2) << MT_PAS_SHIFT) +#define MT_REALM (U(3) << MT_PAS_SHIFT) + +/* + * Access permissions for instruction execution are only relevant for normal + * read-only memory, i.e. MT_MEMORY | MT_RO. They are ignored (and potentially + * overridden) otherwise: + * - Device memory is always marked as execute-never. + * - Read-write normal memory is always marked as execute-never. + */ +#define MT_EXECUTE (U(0) << MT_EXECUTE_SHIFT) +#define MT_EXECUTE_NEVER (U(1) << MT_EXECUTE_SHIFT) + +/* + * When mapping a region at EL0 or EL1, this attribute will be used to determine + * if a User mapping (EL0) will be created or a Privileged mapping (EL1). + */ +#define MT_USER (U(1) << MT_USER_SHIFT) +#define MT_PRIVILEGED (U(0) << MT_USER_SHIFT) + +/* + * Shareability defines the visibility of any cache changes to + * all masters belonging to a shareable domain. + * + * MT_SHAREABILITY_ISH: For inner shareable domain + * MT_SHAREABILITY_OSH: For outer shareable domain + * MT_SHAREABILITY_NSH: For non shareable domain + */ +#define MT_SHAREABILITY_ISH (U(1) << MT_SHAREABILITY_SHIFT) +#define MT_SHAREABILITY_OSH (U(2) << MT_SHAREABILITY_SHIFT) +#define MT_SHAREABILITY_NSH (U(3) << MT_SHAREABILITY_SHIFT) + +/* Compound attributes for most common usages */ +#define MT_CODE (MT_MEMORY | MT_RO | MT_EXECUTE) +#define MT_RO_DATA (MT_MEMORY | MT_RO | MT_EXECUTE_NEVER) +#define MT_RW_DATA (MT_MEMORY | MT_RW | MT_EXECUTE_NEVER) + +/* + * Structure for specifying a single region of memory. + */ +typedef struct mmap_region { + unsigned long long base_pa; + uintptr_t base_va; + size_t size; + unsigned int attr; + /* Desired granularity. See the MAP_REGION2() macro for more details. */ + size_t granularity; +} mmap_region_t; + +/* + * Translation regimes supported by this library. EL_REGIME_INVALID tells the + * library to detect it at runtime. + */ +#define EL1_EL0_REGIME 1 +#define EL2_REGIME 2 +#define EL3_REGIME 3 +#define EL_REGIME_INVALID -1 + +/* Memory type for EL3 regions. With RME, EL3 is in ROOT PAS */ +#if ENABLE_RME +#define EL3_PAS MT_ROOT +#else +#define EL3_PAS MT_SECURE +#endif /* ENABLE_RME */ + +/* + * Declare the translation context type. + * Its definition is private. + */ +typedef struct xlat_ctx xlat_ctx_t; + +/* + * Statically allocate a translation context and associated structures. Also + * initialize them. + * + * _ctx_name: + * Prefix for the translation context variable. + * E.g. If _ctx_name is 'foo', the variable will be called 'foo_xlat_ctx'. + * Useful to distinguish multiple contexts from one another. + * + * _mmap_count: + * Number of mmap_region_t to allocate. + * Would typically be MAX_MMAP_REGIONS for the translation context describing + * the BL image currently executing. + * + * _xlat_tables_count: + * Number of sub-translation tables to allocate. + * Would typically be MAX_XLAT_TABLES for the translation context describing + * the BL image currently executing. + * Note that this is only for sub-tables ; at the initial lookup level, there + * is always a single table. + * + * _virt_addr_space_size, _phy_addr_space_size: + * Size (in bytes) of the virtual (resp. physical) address space. + * Would typically be PLAT_VIRT_ADDR_SPACE_SIZE + * (resp. PLAT_PHY_ADDR_SPACE_SIZE) for the translation context describing the + * BL image currently executing. + */ +#define REGISTER_XLAT_CONTEXT(_ctx_name, _mmap_count, _xlat_tables_count, \ + _virt_addr_space_size, _phy_addr_space_size) \ + REGISTER_XLAT_CONTEXT_FULL_SPEC(_ctx_name, (_mmap_count), \ + (_xlat_tables_count), \ + (_virt_addr_space_size), \ + (_phy_addr_space_size), \ + EL_REGIME_INVALID, \ + "xlat_table", "base_xlat_table") + +/* + * Same as REGISTER_XLAT_CONTEXT plus the additional parameters: + * + * _xlat_regime: + * Specify the translation regime managed by this xlat_ctx_t instance. The + * values are the one from the EL*_REGIME definitions. + * + * _section_name: + * Specify the name of the section where the translation tables have to be + * placed by the linker. + * + * _base_table_section_name: + * Specify the name of the section where the base translation tables have to + * be placed by the linker. + */ +#define REGISTER_XLAT_CONTEXT2(_ctx_name, _mmap_count, _xlat_tables_count, \ + _virt_addr_space_size, _phy_addr_space_size, \ + _xlat_regime, _section_name, _base_table_section_name) \ + REGISTER_XLAT_CONTEXT_FULL_SPEC(_ctx_name, (_mmap_count), \ + (_xlat_tables_count), \ + (_virt_addr_space_size), \ + (_phy_addr_space_size), \ + (_xlat_regime), \ + (_section_name), (_base_table_section_name) \ +) + +/****************************************************************************** + * Generic translation table APIs. + * Each API comes in 2 variants: + * - one that acts on the current translation context for this BL image + * - another that acts on the given translation context instead. This variant + * is named after the 1st version, with an additional '_ctx' suffix. + *****************************************************************************/ + +/* + * Initialize translation tables from the current list of mmap regions. Calling + * this function marks the transition point after which static regions can no + * longer be added. + */ +void init_xlat_tables(void); +void init_xlat_tables_ctx(xlat_ctx_t *ctx); + +/* + * Fill all fields of a dynamic translation tables context. It must be done + * either statically with REGISTER_XLAT_CONTEXT() or at runtime with this + * function. + */ +void xlat_setup_dynamic_ctx(xlat_ctx_t *ctx, unsigned long long pa_max, + uintptr_t va_max, struct mmap_region *mmap, + unsigned int mmap_num, uint64_t **tables, + unsigned int tables_num, uint64_t *base_table, + int xlat_regime, int *mapped_regions); + +/* + * Add a static region with defined base PA and base VA. This function can only + * be used before initializing the translation tables. The region cannot be + * removed afterwards. + */ +void mmap_add_region(unsigned long long base_pa, uintptr_t base_va, + size_t size, unsigned int attr); +void mmap_add_region_ctx(xlat_ctx_t *ctx, const mmap_region_t *mm); + +/* + * Add an array of static regions with defined base PA and base VA. This + * function can only be used before initializing the translation tables. The + * regions cannot be removed afterwards. + */ +void mmap_add(const mmap_region_t *mm); +void mmap_add_ctx(xlat_ctx_t *ctx, const mmap_region_t *mm); + +/* + * Add a region with defined base PA. Returns base VA calculated using the + * highest existing region in the mmap array even if it fails to allocate the + * region. + */ +void mmap_add_region_alloc_va(unsigned long long base_pa, uintptr_t *base_va, + size_t size, unsigned int attr); +void mmap_add_region_alloc_va_ctx(xlat_ctx_t *ctx, mmap_region_t *mm); + +/* + * Add an array of static regions with defined base PA, and fill the base VA + * field on the array of structs. This function can only be used before + * initializing the translation tables. The regions cannot be removed afterwards. + */ +void mmap_add_alloc_va(mmap_region_t *mm); + +#if PLAT_XLAT_TABLES_DYNAMIC +/* + * Add a dynamic region with defined base PA and base VA. This type of region + * can be added and removed even after the translation tables are initialized. + * + * Returns: + * 0: Success. + * EINVAL: Invalid values were used as arguments. + * ERANGE: Memory limits were surpassed. + * ENOMEM: Not enough space in the mmap array or not enough free xlat tables. + * EPERM: It overlaps another region in an invalid way. + */ +int mmap_add_dynamic_region(unsigned long long base_pa, uintptr_t base_va, + size_t size, unsigned int attr); +int mmap_add_dynamic_region_ctx(xlat_ctx_t *ctx, mmap_region_t *mm); + +/* + * Add a dynamic region with defined base PA. Returns base VA calculated using + * the highest existing region in the mmap array even if it fails to allocate + * the region. + * + * mmap_add_dynamic_region_alloc_va() returns the allocated VA in 'base_va'. + * mmap_add_dynamic_region_alloc_va_ctx() returns it in 'mm->base_va'. + * + * It returns the same error values as mmap_add_dynamic_region(). + */ +int mmap_add_dynamic_region_alloc_va(unsigned long long base_pa, + uintptr_t *base_va, + size_t size, unsigned int attr); +int mmap_add_dynamic_region_alloc_va_ctx(xlat_ctx_t *ctx, mmap_region_t *mm); + +/* + * Remove a region with the specified base VA and size. Only dynamic regions can + * be removed, and they can be removed even if the translation tables are + * initialized. + * + * Returns: + * 0: Success. + * EINVAL: The specified region wasn't found. + * EPERM: Trying to remove a static region. + */ +int mmap_remove_dynamic_region(uintptr_t base_va, size_t size); +int mmap_remove_dynamic_region_ctx(xlat_ctx_t *ctx, + uintptr_t base_va, + size_t size); + +#endif /* PLAT_XLAT_TABLES_DYNAMIC */ + +/* + * Change the memory attributes of the memory region starting from a given + * virtual address in a set of translation tables. + * + * This function can only be used after the translation tables have been + * initialized. + * + * The base address of the memory region must be aligned on a page boundary. + * The size of this memory region must be a multiple of a page size. + * The memory region must be already mapped by the given translation tables + * and it must be mapped at the granularity of a page. + * + * Return 0 on success, a negative value on error. + * + * In case of error, the memory attributes remain unchanged and this function + * has no effect. + * + * ctx + * Translation context to work on. + * base_va: + * Virtual address of the 1st page to change the attributes of. + * size: + * Size in bytes of the memory region. + * attr: + * New attributes of the page tables. The attributes that can be changed are + * data access (MT_RO/MT_RW), instruction access (MT_EXECUTE_NEVER/MT_EXECUTE) + * and user/privileged access (MT_USER/MT_PRIVILEGED) in the case of contexts + * that are used in the EL1&0 translation regime. Also, note that this + * function doesn't allow to remap a region as RW and executable, or to remap + * device memory as executable. + * + * NOTE: The caller of this function must be able to write to the translation + * tables, i.e. the memory where they are stored must be mapped with read-write + * access permissions. This function assumes it is the case. If this is not + * the case then this function might trigger a data abort exception. + * + * NOTE2: The caller is responsible for making sure that the targeted + * translation tables are not modified by any other code while this function is + * executing. + */ +int xlat_change_mem_attributes_ctx(const xlat_ctx_t *ctx, uintptr_t base_va, + size_t size, uint32_t attr); +int xlat_change_mem_attributes(uintptr_t base_va, size_t size, uint32_t attr); + +#if PLAT_RO_XLAT_TABLES +/* + * Change the memory attributes of the memory region encompassing the higher + * level translation tables to secure read-only data. + * + * Return 0 on success, a negative error code on error. + */ +int xlat_make_tables_readonly(void); +#endif + +/* + * Query the memory attributes of a memory page in a set of translation tables. + * + * Return 0 on success, a negative error code on error. + * On success, the attributes are stored into *attr. + * + * ctx + * Translation context to work on. + * base_va + * Virtual address of the page to get the attributes of. + * There are no alignment restrictions on this address. The attributes of the + * memory page it lies within are returned. + * attr + * Output parameter where to store the attributes of the targeted memory page. + */ +int xlat_get_mem_attributes_ctx(const xlat_ctx_t *ctx, uintptr_t base_va, + uint32_t *attr); +int xlat_get_mem_attributes(uintptr_t base_va, uint32_t *attr); + +#endif /*__ASSEMBLER__*/ +#endif /* XLAT_TABLES_V2_H */ |