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/** @file
Public include file for PageTableLib library.
Copyright (c) 2022 - 2023, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef PAGE_TABLE_LIB_H_
#define PAGE_TABLE_LIB_H_
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 = Dirty (set by CPU)
UINT64 Pat : 1; // PAT
UINT64 Global : 1; // 0 = Not global, 1 = Global (if CR4.PGE = 1)
UINT64 Reserved1 : 3; // Ignored
UINT64 PageTableBaseAddress : 40; // Page Table Base Address
UINT64 Reserved2 : 7; // Ignored
UINT64 ProtectionKey : 4; // Protection key
UINT64 Nx : 1; // No Execute bit
} Bits;
UINT64 Uint64;
} IA32_MAP_ATTRIBUTE;
#define IA32_MAP_ATTRIBUTE_PAGE_TABLE_BASE_ADDRESS_MASK 0xFFFFFFFFFF000ull
#define IA32_MAP_ATTRIBUTE_PAGE_TABLE_BASE_ADDRESS(pa) ((pa)->Uint64 & IA32_MAP_ATTRIBUTE_PAGE_TABLE_BASE_ADDRESS_MASK)
#define IA32_MAP_ATTRIBUTE_ATTRIBUTES(pa) ((pa)->Uint64 & ~IA32_MAP_ATTRIBUTE_PAGE_TABLE_BASE_ADDRESS_MASK)
//
// Below enum follows "4.1.1 Four Paging Modes" in Chapter 4 Paging of SDM Volume 3.
// Page1GB is only supported in 4-level and 5-level.
//
typedef enum {
Paging32bit,
//
// High byte in paging mode indicates the max levels of the page table.
// Low byte in paging mode indicates the max level that can be a leaf entry.
//
PagingPae = 0x0302,
Paging4Level = 0x0402,
Paging4Level1GB = 0x0403,
Paging5Level = 0x0502,
Paging5Level1GB = 0x0503,
PagingModeMax
} PAGING_MODE;
/**
Create or update page table to map [LinearAddress, LinearAddress + Length) with specified attribute.
@param[in, out] PageTable The pointer to the page table to update, or pointer to NULL if a new page table is to be created.
@param[in] PagingMode The paging mode.
@param[in] Buffer The free buffer to be used for page table creation/updating.
@param[in, out] BufferSize The buffer size.
On return, the remaining buffer size.
The free buffer is used from the end so caller can supply the same Buffer pointer with an updated
BufferSize in the second call to this API.
@param[in] LinearAddress The start of the linear address range.
@param[in] Length The length of the linear address range.
@param[in] Attribute The attribute of the linear address range.
All non-reserved fields in IA32_MAP_ATTRIBUTE are supported to set in the page table.
Page table entries that map the linear address range are reset to 0 before set to the new attribute
when a new physical base address is set.
@param[in] Mask The mask used for attribute. The corresponding field in Attribute is ignored if that in Mask is 0.
@retval RETURN_UNSUPPORTED PagingMode is not supported.
@retval RETURN_INVALID_PARAMETER PageTable, BufferSize, Attribute or Mask is NULL.
@retval RETURN_INVALID_PARAMETER *BufferSize is not multiple of 4KB.
@retval RETURN_BUFFER_TOO_SMALL The buffer is too small for page table creation/updating.
BufferSize is updated to indicate the expected buffer size.
Caller may still get RETURN_BUFFER_TOO_SMALL with the new BufferSize.
@retval RETURN_SUCCESS PageTable is created/updated successfully or the input Length is 0.
**/
RETURN_STATUS
EFIAPI
PageTableMap (
IN OUT UINTN *PageTable OPTIONAL,
IN PAGING_MODE PagingMode,
IN VOID *Buffer,
IN OUT UINTN *BufferSize,
IN UINT64 LinearAddress,
IN UINT64 Length,
IN IA32_MAP_ATTRIBUTE *Attribute,
IN IA32_MAP_ATTRIBUTE *Mask
);
typedef struct {
UINT64 LinearAddress;
UINT64 Length;
IA32_MAP_ATTRIBUTE Attribute;
} IA32_MAP_ENTRY;
/**
Parse page table.
@param[in] PageTable Pointer to the page table.
@param[in] PagingMode The paging mode.
@param[out] Map Return an array that describes multiple linear address ranges.
@param[in, out] MapCount On input, the maximum number of entries that Map can hold.
On output, the number of entries in Map.
@retval RETURN_UNSUPPORTED PageLevel is not 5 or 4.
@retval RETURN_INVALID_PARAMETER MapCount is NULL.
@retval RETURN_INVALID_PARAMETER *MapCount is not 0 but Map is NULL.
@retval RETURN_BUFFER_TOO_SMALL *MapCount is too small.
@retval RETURN_SUCCESS Page table is parsed successfully.
**/
RETURN_STATUS
EFIAPI
PageTableParse (
IN UINTN PageTable,
IN PAGING_MODE PagingMode,
IN IA32_MAP_ENTRY *Map,
IN OUT UINTN *MapCount
);
#endif
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