93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/*
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* Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef XLAT_TABLES_H
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#define XLAT_TABLES_H
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#include <lib/xlat_tables/xlat_tables_defs.h>
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#ifndef __ASSEMBLER__
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#include <stddef.h>
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#include <stdint.h>
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#include <lib/xlat_tables/xlat_mmu_helpers.h>
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/* Helper macro to define entries for mmap_region_t. It creates
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* identity mappings for each region.
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*/
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#define MAP_REGION_FLAT(adr, sz, attr) MAP_REGION(adr, adr, sz, attr)
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/* Helper macro to define entries for mmap_region_t. It allows to
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* re-map address mappings from 'pa' to 'va' for each region.
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*/
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#define MAP_REGION(pa, va, sz, attr) {(pa), (va), (sz), (attr)}
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/*
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* Shifts and masks to access fields of an mmap attribute
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*/
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#define MT_TYPE_MASK U(0x7)
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#define MT_TYPE(_attr) ((_attr) & MT_TYPE_MASK)
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/* Access permissions (RO/RW) */
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#define MT_PERM_SHIFT U(3)
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/* Security state (SECURE/NS) */
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#define MT_SEC_SHIFT U(4)
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/* Access permissions for instruction execution (EXECUTE/EXECUTE_NEVER) */
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#define MT_EXECUTE_SHIFT U(5)
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/*
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* Memory mapping attributes
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*/
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/*
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* Memory types supported.
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* These are organised so that, going down the list, the memory types are
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* getting weaker; conversely going up the list the memory types are getting
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* stronger.
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*/
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#define MT_DEVICE U(0)
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#define MT_NON_CACHEABLE U(1)
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#define MT_MEMORY U(2)
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/* Values up to 7 are reserved to add new memory types in the future */
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#define MT_RO (U(0) << MT_PERM_SHIFT)
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#define MT_RW (U(1) << MT_PERM_SHIFT)
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#define MT_SECURE (U(0) << MT_SEC_SHIFT)
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#define MT_NS (U(1) << MT_SEC_SHIFT)
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/*
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* Access permissions for instruction execution are only relevant for normal
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* read-only memory, i.e. MT_MEMORY | MT_RO. They are ignored (and potentially
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* overridden) otherwise:
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* - Device memory is always marked as execute-never.
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* - Read-write normal memory is always marked as execute-never.
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*/
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#define MT_EXECUTE (U(0) << MT_EXECUTE_SHIFT)
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#define MT_EXECUTE_NEVER (U(1) << MT_EXECUTE_SHIFT)
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/* Compound attributes for most common usages */
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#define MT_CODE (MT_MEMORY | MT_RO | MT_EXECUTE)
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#define MT_RO_DATA (MT_MEMORY | MT_RO | MT_EXECUTE_NEVER)
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/*
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* Structure for specifying a single region of memory.
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*/
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typedef struct mmap_region {
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unsigned long long base_pa;
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uintptr_t base_va;
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size_t size;
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unsigned int attr;
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} mmap_region_t;
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/* Generic translation table APIs */
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void init_xlat_tables(void);
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void mmap_add_region(unsigned long long base_pa, uintptr_t base_va,
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size_t size, unsigned int attr);
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void mmap_add(const mmap_region_t *mm);
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#endif /*__ASSEMBLER__*/
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#endif /* XLAT_TABLES_H */
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