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/** @file
Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Module Name:
VirtualMemory.h
Abstract:
Revision History:
**/
#ifndef _VIRTUAL_MEMORY_H_
#define _VIRTUAL_MEMORY_H_
#pragma pack(1)
//
// Page Map Level 4 Offset (PML4) and
// Page Directory Pointer Table (PDPE) entries 4K & 2M
//
typedef union {
struct {
UINT64 Present:1; // 0 = Not present in memory, 1 = Present in memory
UINT64 ReadWrite:1; // 0 = Read-Only, 1= Read/Write
UINT64 UserSupervisor:1; // 0 = Supervisor, 1=User
UINT64 WriteThrough:1; // 0 = Write-Back caching, 1=Write-Through caching
UINT64 CacheDisabled:1; // 0 = Cached, 1=Non-Cached
UINT64 Accessed:1; // 0 = Not accessed, 1 = Accessed (set by CPU)
UINT64 Reserved:1; // Reserved
UINT64 MustBeZero:2; // Must Be Zero
UINT64 Available:3; // Available for use by system software
UINT64 PageTableBaseAddress:40; // Page Table Base Address
UINT64 AvabilableHigh:11; // Available for use by system software
UINT64 Nx:1; // No Execute bit
} Bits;
UINT64 Uint64;
} X64_PAGE_MAP_AND_DIRECTORY_POINTER_2MB_4K;
//
// Page Directory Entry 4K
//
typedef union {
struct {
UINT64 Present:1; // 0 = Not present in memory, 1 = Present in memory
UINT64 ReadWrite:1; // 0 = Read-Only, 1= Read/Write
UINT64 UserSupervisor:1; // 0 = Supervisor, 1=User
UINT64 WriteThrough:1; // 0 = Write-Back caching, 1=Write-Through caching
UINT64 CacheDisabled:1; // 0 = Cached, 1=Non-Cached
UINT64 Accessed:1; // 0 = Not accessed, 1 = Accessed (set by CPU)
UINT64 MustBeZero:3; // Must Be Zero
UINT64 Available:3; // Available for use by system software
UINT64 PageTableBaseAddress:40; // Page Table Base Address
UINT64 AvabilableHigh:11; // Available for use by system software
UINT64 Nx:1; // No Execute bit
} Bits;
UINT64 Uint64;
} X64_PAGE_DIRECTORY_ENTRY_4K;
//
// Page Table Entry 4K
//
typedef union {
struct {
UINT64 Present:1; // 0 = Not present in memory, 1 = Present in memory
UINT64 ReadWrite:1; // 0 = Read-Only, 1= Read/Write
UINT64 UserSupervisor:1; // 0 = Supervisor, 1=User
UINT64 WriteThrough:1; // 0 = Write-Back caching, 1=Write-Through caching
UINT64 CacheDisabled:1; // 0 = Cached, 1=Non-Cached
UINT64 Accessed:1; // 0 = Not accessed, 1 = Accessed (set by CPU)
UINT64 Dirty:1; // 0 = Not Dirty, 1 = written by processor on access to page
UINT64 PAT:1; // 0 = Ignore Page Attribute Table
UINT64 Global:1; // 0 = Not global page, 1 = global page TLB not cleared on CR3 write
UINT64 Available:3; // Available for use by system software
UINT64 PageTableBaseAddress:40; // Page Table Base Address
UINT64 AvabilableHigh:11; // Available for use by system software
UINT64 Nx:1; // 0 = Execute Code, 1 = No Code Execution
} Bits;
UINT64 Uint64;
} X64_PAGE_TABLE_ENTRY_4K;
//
// Page Table Entry 2M
//
typedef union {
struct {
UINT64 Present:1; // 0 = Not present in memory, 1 = Present in memory
UINT64 ReadWrite:1; // 0 = Read-Only, 1= Read/Write
UINT64 UserSupervisor:1; // 0 = Supervisor, 1=User
UINT64 WriteThrough:1; // 0 = Write-Back caching, 1=Write-Through caching
UINT64 CacheDisabled:1; // 0 = Cached, 1=Non-Cached
UINT64 Accessed:1; // 0 = Not accessed, 1 = Accessed (set by CPU)
UINT64 Dirty:1; // 0 = Not Dirty, 1 = written by processor on access to page
UINT64 MustBe1:1; // Must be 1
UINT64 Global:1; // 0 = Not global page, 1 = global page TLB not cleared on CR3 write
UINT64 Available:3; // Available for use by system software
UINT64 PAT:1; //
UINT64 MustBeZero:8; // Must be zero;
UINT64 PageTableBaseAddress:31; // Page Table Base Address
UINT64 AvabilableHigh:11; // Available for use by system software
UINT64 Nx:1; // 0 = Execute Code, 1 = No Code Execution
} Bits;
UINT64 Uint64;
} X64_PAGE_TABLE_ENTRY_2M;
#pragma pack()
#endif
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