PageTables.h File Reference

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Data Structures
union	IA32_GDT
struct	X64_IDT_GATE_DESCRIPTOR
union	PAGE_MAP_AND_DIRECTORY_POINTER
union	PAGE_TABLE_4K_ENTRY
union	PAGE_TABLE_ENTRY
union	PAGE_TABLE_1G_ENTRY
struct	PAGE_TABLE_POOL

Macros
#define	SYS_CODE64_SEL   0x38
#define	CR0_WP   BIT16
#define	IA32_PG_P   BIT0
#define	IA32_PG_RW   BIT1
#define	IA32_PG_PS   BIT7
#define	PAGING_PAE_INDEX_MASK   0x1FF
#define	PAGING_4K_ADDRESS_MASK_64   0x000FFFFFFFFFF000ull
#define	PAGING_2M_ADDRESS_MASK_64   0x000FFFFFFFE00000ull
#define	PAGING_1G_ADDRESS_MASK_64   0x000FFFFFC0000000ull
#define	PAGING_L1_ADDRESS_SHIFT   12
#define	PAGING_L2_ADDRESS_SHIFT   21
#define	PAGING_L3_ADDRESS_SHIFT   30
#define	PAGING_L4_ADDRESS_SHIFT   39
#define	PAGING_PML4E_NUMBER   4
#define	PAGE_TABLE_POOL_ALIGNMENT   BASE_2MB
#define	PAGE_TABLE_POOL_UNIT_SIZE   SIZE_2MB
#define	PAGE_TABLE_POOL_UNIT_PAGES   EFI_SIZE_TO_PAGES (PAGE_TABLE_POOL_UNIT_SIZE)
#define	PAGE_TABLE_POOL_ALIGN_MASK    (~(EFI_PHYSICAL_ADDRESS)(PAGE_TABLE_POOL_ALIGNMENT - 1))

Functions
UINTN	CreateIdentityMappingPageTables (IN EFI_PHYSICAL_ADDRESS StackBase, IN UINTN StackSize)
VOID	ClearFirst4KPage (IN VOID *HobStart)
BOOLEAN	IsNullDetectionEnabled (VOID)

Detailed Description

x64 Long Mode Virtual Memory Management Definitions

References: 1) IA-32 Intel(R) Architecture Software Developer's Manual Volume 1:Basic Architecture, Intel 2) IA-32 Intel(R) Architecture Software Developer's Manual Volume 2:Instruction Set Reference, Intel 3) IA-32 Intel(R) Architecture Software Developer's Manual Volume 3:System Programmer's Guide, Intel 4) AMD64 Architecture Programmer's Manual Volume 2: System Programming

Copyright (c) 2006 - 2020, Intel Corporation. All rights reserved.
Copyright (c) 2017, AMD Incorporated. All rights reserved.

SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file PageTables.h.

Macro Definition Documentation

CR0_WP

#define CR0_WP   BIT16

Definition at line 144 of file PageTables.h.

IA32_PG_P

#define IA32_PG_P   BIT0

Definition at line 146 of file PageTables.h.

IA32_PG_PS

#define IA32_PG_PS   BIT7

Definition at line 148 of file PageTables.h.

IA32_PG_RW

#define IA32_PG_RW   BIT1

Definition at line 147 of file PageTables.h.

PAGE_TABLE_POOL_ALIGN_MASK

#define PAGE_TABLE_POOL_ALIGN_MASK    (~(EFI_PHYSICAL_ADDRESS)(PAGE_TABLE_POOL_ALIGNMENT - 1))

Definition at line 166 of file PageTables.h.

PAGE_TABLE_POOL_ALIGNMENT

#define PAGE_TABLE_POOL_ALIGNMENT   BASE_2MB

Definition at line 163 of file PageTables.h.

PAGE_TABLE_POOL_UNIT_PAGES

#define PAGE_TABLE_POOL_UNIT_PAGES   EFI_SIZE_TO_PAGES (PAGE_TABLE_POOL_UNIT_SIZE)

Definition at line 165 of file PageTables.h.

PAGE_TABLE_POOL_UNIT_SIZE

#define PAGE_TABLE_POOL_UNIT_SIZE   SIZE_2MB

Definition at line 164 of file PageTables.h.

PAGING_1G_ADDRESS_MASK_64

#define PAGING_1G_ADDRESS_MASK_64   0x000FFFFFC0000000ull

Definition at line 154 of file PageTables.h.

PAGING_2M_ADDRESS_MASK_64

#define PAGING_2M_ADDRESS_MASK_64   0x000FFFFFFFE00000ull

Definition at line 153 of file PageTables.h.

PAGING_4K_ADDRESS_MASK_64

#define PAGING_4K_ADDRESS_MASK_64   0x000FFFFFFFFFF000ull

Definition at line 152 of file PageTables.h.

PAGING_L1_ADDRESS_SHIFT

#define PAGING_L1_ADDRESS_SHIFT   12

Definition at line 156 of file PageTables.h.

PAGING_L2_ADDRESS_SHIFT

#define PAGING_L2_ADDRESS_SHIFT   21

Definition at line 157 of file PageTables.h.

PAGING_L3_ADDRESS_SHIFT

#define PAGING_L3_ADDRESS_SHIFT   30

Definition at line 158 of file PageTables.h.

PAGING_L4_ADDRESS_SHIFT

#define PAGING_L4_ADDRESS_SHIFT   39

Definition at line 159 of file PageTables.h.

PAGING_PAE_INDEX_MASK

#define PAGING_PAE_INDEX_MASK   0x1FF

Definition at line 150 of file PageTables.h.

PAGING_PML4E_NUMBER

#define PAGING_PML4E_NUMBER   4

Definition at line 161 of file PageTables.h.

SYS_CODE64_SEL

#define SYS_CODE64_SEL   0x38

Definition at line 20 of file PageTables.h.

Function Documentation

ClearFirst4KPage()

VOID ClearFirst4KPage

(

IN VOID *

HobStart

)

Clear legacy memory located at the first 4K-page.

This function traverses the whole HOB list to check if memory from 0 to 4095 exists and has not been allocated, and then clear it if so.

Parameters

HobStart

The start of HobList passed to DxeCore.

Clear legacy memory located at the first 4K-page, if available.

This function traverses the whole HOB list to check if memory from 0 to 4095 exists and has not been allocated, and then clear it if so.

Parameters

HobStart

The start of HobList passed to DxeCore.

Definition at line 44 of file VirtualMemory.c.

CreateIdentityMappingPageTables()

UINTN CreateIdentityMappingPageTables	(	IN EFI_PHYSICAL_ADDRESS	StackBase,
		IN UINTN	StackSize
	)

Allocates and fills in the Page Directory and Page Table Entries to establish a 1:1 Virtual to Physical mapping.

Parameters

[in]	StackBase	Stack base address.
[in]	StackSize	Stack size.

Returns

The address of 4 level page map.

Definition at line 691 of file VirtualMemory.c.

IsNullDetectionEnabled()

BOOLEAN IsNullDetectionEnabled

(

VOID

)

Return configure status of NULL pointer detection feature.

Returns

TRUE NULL pointer detection feature is enabled

FALSE NULL pointer detection feature is disabled

Definition at line 108 of file VirtualMemory.c.