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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>
/*
* 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 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_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)
/*
* In the EL1&0 translation regime, mark the region as User (EL0) or
* Privileged (EL1). In the EL3 translation regime this has no effect.
*/
#define MT_USER_SHIFT U(6)
/* 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,
/*
* 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).
*/
MT_USER = U(1) << MT_USER_SHIFT,
MT_PRIVILEGED = U(0) << MT_USER_SHIFT,
} mmap_attr_t;
/* 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;
mmap_attr_t attr;
/* Desired granularity. See the MAP_REGION2() macro for more details. */
size_t granularity;
} mmap_region_t;
/*
* Translation regimes supported by this library.
*/
typedef enum xlat_regime {
EL1_EL0_REGIME,
EL3_REGIME,
} xlat_regime_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_FULL_SPEC(_ctx_name, _mmap_count, \
_xlat_tables_count, \
_virt_addr_space_size, \
_phy_addr_space_size, \
IMAGE_XLAT_DEFAULT_REGIME, \
"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 xlat_regime_t enumeration.
*
* _section_name:
* Specify the name of the section where the 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) \
_REGISTER_XLAT_CONTEXT_FULL_SPEC(_ctx_name, _mmap_count, \
_xlat_tables_count, \
_virt_addr_space_size, \
_phy_addr_space_size, \
_xlat_regime, _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);
/*
* 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 */
/*
* 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 change_mem_attributes(xlat_ctx_t *ctx, uintptr_t base_va, size_t size,
mmap_attr_t attr);
/*
* 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 *attributes.
*
* 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.
* attributes
* Output parameter where to store the attributes of the targeted memory page.
*/
int get_mem_attributes(const xlat_ctx_t *ctx, uintptr_t base_va,
mmap_attr_t *attributes);
#endif /*__ASSEMBLY__*/
#endif /* __XLAT_TABLES_V2_H__ */