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mmustructs.h
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/*
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* Copyright (c) 2011-2014 Wind River Systems, Inc.
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* Copyright (c) 2020 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_INCLUDE_ARCH_X86_MMU_H
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#define ZEPHYR_INCLUDE_ARCH_X86_MMU_H
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#include <
zephyr/sys/util.h
>
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/*
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* K_MEM_PARTITION_* defines
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*
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* Slated for removal when virtual memory is implemented, memory
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* mapping APIs will replace memory domains.
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*/
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#define Z_X86_MMU_RW BIT64(1)
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#define Z_X86_MMU_US BIT64(2)
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#if defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
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#define Z_X86_MMU_XD BIT64(63)
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#else
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#define Z_X86_MMU_XD 0
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#endif
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/* For these we'll just use the same bits in the PTE */
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#define ARCH_DATA_PAGE_DIRTY ((uintptr_t)BIT(6))
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#define ARCH_DATA_PAGE_LOADED ((uintptr_t)BIT(0))
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#define ARCH_DATA_PAGE_ACCESSED ((uintptr_t)BIT(5))
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/* Use an PAT bit for this one since it's never set in a mapped PTE */
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#define ARCH_DATA_PAGE_NOT_MAPPED ((uintptr_t)BIT(7))
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/*
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* Special unpaged "location" tags. These are defined as the highest possible
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* PTE address values unlikely to conflict with backing store locations.
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* As noted in arch_page_info_get(), those values on PAE systems, whose
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* pentry_t is larger than uintptr_t get truncated.
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*/
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#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
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#define ARCH_UNPAGED_ANON_ZERO ((uintptr_t)0x07FFFFFFFFFFF000ULL)
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#define ARCH_UNPAGED_ANON_UNINIT ((uintptr_t)0x07FFFFFFFFFFE000ULL)
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#else
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#define ARCH_UNPAGED_ANON_ZERO ((uintptr_t)0xFFFFF000U)
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#define ARCH_UNPAGED_ANON_UNINIT ((uintptr_t)0xFFFFE000U)
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#endif
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/* Always true with 32-bit page tables, don't enable
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* CONFIG_EXECUTE_XOR_WRITE and expect it to work for you
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*/
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#define K_MEM_PARTITION_IS_EXECUTABLE(attr) (((attr) & Z_X86_MMU_XD) == 0)
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#define K_MEM_PARTITION_IS_WRITABLE(attr) (((attr) & Z_X86_MMU_RW) != 0)
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/* memory partition arch/soc independent attribute */
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#define K_MEM_PARTITION_P_RW_U_RW (Z_X86_MMU_RW | Z_X86_MMU_US | \
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Z_X86_MMU_XD)
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#define K_MEM_PARTITION_P_RW_U_NA (Z_X86_MMU_RW | Z_X86_MMU_XD)
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#define K_MEM_PARTITION_P_RO_U_RO (Z_X86_MMU_US | Z_X86_MMU_XD)
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#define K_MEM_PARTITION_P_RO_U_NA Z_X86_MMU_XD
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/* Execution-allowed attributes */
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#define K_MEM_PARTITION_P_RWX_U_RWX (Z_X86_MMU_RW | Z_X86_MMU_US)
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#define K_MEM_PARTITION_P_RWX_U_NA Z_X86_MMU_RW
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#define K_MEM_PARTITION_P_RX_U_RX Z_X86_MMU_US
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#define K_MEM_PARTITION_P_RX_U_NA (0)
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/* memory partition access permission mask */
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#define K_MEM_PARTITION_PERM_MASK (Z_X86_MMU_RW | Z_X86_MMU_US | \
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Z_X86_MMU_XD)
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#ifndef _ASMLANGUAGE
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#include <
zephyr/sys/slist.h
>
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/* Page table entry data type at all levels. Defined here due to
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* k_mem_partition_attr_t, eventually move to private x86_mmu.h
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*/
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#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
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typedef
uint64_t
pentry_t
;
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#else
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typedef
uint32_t
pentry_t
;
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#endif
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typedef
pentry_t
k_mem_partition_attr_t
;
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struct
arch_mem_domain
{
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#ifdef CONFIG_X86_PAE
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/* 4-entry, 32-byte top-level PDPT */
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pentry_t
pdpt[4];
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#endif
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/* Pointer to top-level structure, either a PML4, PDPT, PD */
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pentry_t
*
ptables
;
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/* Linked list of all active memory domains */
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sys_snode_t
node
;
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#ifdef CONFIG_X86_PAE
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} __aligned(32);
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#else
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};
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#endif
/* CONFIG_X86_PAE */
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#endif
/* _ASMLANGUAGE */
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#endif
/* ZEPHYR_INCLUDE_ARCH_X86_MMU_H */
sys_snode_t
struct _snode sys_snode_t
Single-linked list node structure.
Definition
slist.h:39
k_mem_partition_attr_t
pentry_t k_mem_partition_attr_t
Definition
mmustructs.h:81
pentry_t
uint32_t pentry_t
Definition
mmustructs.h:79
slist.h
uint32_t
__UINT32_TYPE__ uint32_t
Definition
stdint.h:90
uint64_t
__UINT64_TYPE__ uint64_t
Definition
stdint.h:91
arch_mem_domain
Definition
arch.h:46
arch_mem_domain::node
sys_snode_t node
Definition
arch.h:50
arch_mem_domain::ptables
pentry_t * ptables
Definition
mmustructs.h:89
util.h
Misc utilities.
zephyr
arch
x86
mmustructs.h
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