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/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef __XLAT_TABLES_V2_H__
#define __XLAT_TABLES_V2_H__
#include <xlat_tables_defs.h>
#ifndef __ASSEMBLY__
#include <stddef.h>
#include <stdint.h>
#include <xlat_mmu_helpers.h>
#include <xlat_tables_v2_helpers.h>
/* Helper macro to define entries for mmap_region_t. It creates
* identity mappings for each region.
*/
#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
* re-map address mappings from 'pa' to 'va' for each region.
*/
#define MAP_REGION(_pa, _va, _sz, _attr) ((mmap_region_t){ \
.base_pa = (_pa), \
.base_va = (_va), \
.size = (_sz), \
.attr = (_attr), \
})
/*
* Shifts and masks to access fields of an mmap_attr_t
*/
#define MT_TYPE_MASK U(0x7)
#define MT_TYPE(_attr) ((_attr) & MT_TYPE_MASK)
/* Access permissions (RO/RW) */
#define MT_PERM_SHIFT U(3)
/* Security state (SECURE/NS) */
#define MT_SEC_SHIFT U(4)
/* Access permissions for instruction execution (EXECUTE/EXECUTE_NEVER) */
#define MT_EXECUTE_SHIFT U(5)
/* All other bits are reserved */
/*
* Memory mapping attributes
*/
typedef enum {
/*
* 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.
*/
MT_DEVICE,
MT_NON_CACHEABLE,
MT_MEMORY,
/* Values up to 7 are reserved to add new memory types in the future */
MT_RO = U(0) << MT_PERM_SHIFT,
MT_RW = U(1) << MT_PERM_SHIFT,
MT_SECURE = U(0) << MT_SEC_SHIFT,
MT_NS = U(1) << MT_SEC_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.
*/
MT_EXECUTE = U(0) << MT_EXECUTE_SHIFT,
MT_EXECUTE_NEVER = U(1) << MT_EXECUTE_SHIFT,
} mmap_attr_t;
#define MT_CODE (MT_MEMORY | MT_RO | MT_EXECUTE)
#define MT_RO_DATA (MT_MEMORY | MT_RO | 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;
mmap_attr_t attr;
} mmap_region_t;
/*
* 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(_ctx_name, _mmap_count, _xlat_tables_count, \
_virt_addr_space_size, _phy_addr_space_size)
/******************************************************************************
* 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);
/*
* 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, mmap_attr_t 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);
#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, mmap_attr_t attr);
int mmap_add_dynamic_region_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 */
#endif /*__ASSEMBLY__*/
#endif /* __XLAT_TABLES_V2_H__ */