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/** @file
MTRR setting library
Copyright (c) 2008 - 2010, Intel Corporation
All rights reserved. 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.
**/
#ifndef _MTRR_LIB_H_
#define _MTRR_LIB_H_
//
// According to IA32 SDM, MTRRs number and msr offset are always consistent
// for IA32 processor family
//
#define MTRR_NUMBER_OF_VARIABLE_MTRR 8
#define MTRR_NUMBER_OF_FIXED_MTRR 11
#define FIRMWARE_VARIABLE_MTRR_NUMBER 6
#define MTRR_LIB_IA32_MTRR_FIX64K_00000 0x250
#define MTRR_LIB_IA32_MTRR_FIX16K_80000 0x258
#define MTRR_LIB_IA32_MTRR_FIX16K_A0000 0x259
#define MTRR_LIB_IA32_MTRR_FIX4K_C0000 0x268
#define MTRR_LIB_IA32_MTRR_FIX4K_C8000 0x269
#define MTRR_LIB_IA32_MTRR_FIX4K_D0000 0x26A
#define MTRR_LIB_IA32_MTRR_FIX4K_D8000 0x26B
#define MTRR_LIB_IA32_MTRR_FIX4K_E0000 0x26C
#define MTRR_LIB_IA32_MTRR_FIX4K_E8000 0x26D
#define MTRR_LIB_IA32_MTRR_FIX4K_F0000 0x26E
#define MTRR_LIB_IA32_MTRR_FIX4K_F8000 0x26F
#define MTRR_LIB_IA32_VARIABLE_MTRR_BASE 0x200
#define MTRR_LIB_IA32_VARIABLE_MTRR_END 0x20F
#define MTRR_LIB_IA32_MTRR_DEF_TYPE 0x2FF
#define MTRR_LIB_MSR_VALID_MASK 0xFFFFFFFFFULL
#define MTRR_LIB_CACHE_VALID_ADDRESS 0xFFFFFF000ULL
#define MTRR_LIB_CACHE_MTRR_ENABLED 0x800
#define MTRR_LIB_CACHE_FIXED_MTRR_ENABLED 0x400
//
// Structure to describe a fixed MTRR
//
typedef struct {
UINT32 Msr;
UINT32 BaseAddress;
UINT32 Length;
} FIXED_MTRR;
//
// Structure to describe a variable MTRR
//
typedef struct {
UINT64 BaseAddress;
UINT64 Length;
UINT64 Type;
UINT32 Msr;
BOOLEAN Valid;
BOOLEAN Used;
} VARIABLE_MTRR;
//
// Structure to hold base and mask pair for variable MTRR register
//
typedef struct _MTRR_VARIABLE_SETTING_ {
UINT64 Base;
UINT64 Mask;
} MTRR_VARIABLE_SETTING;
//
// Array for variable MTRRs
//
typedef struct _MTRR_VARIABLE_SETTINGS_ {
MTRR_VARIABLE_SETTING Mtrr[MTRR_NUMBER_OF_VARIABLE_MTRR];
} MTRR_VARIABLE_SETTINGS;
//
// Array for fixed mtrrs
//
typedef struct _MTRR_FIXED_SETTINGS_ {
UINT64 Mtrr[MTRR_NUMBER_OF_FIXED_MTRR];
} MTRR_FIXED_SETTINGS;
//
// Structure to hold all MTRRs
//
typedef struct _MTRR_SETTINGS_ {
MTRR_FIXED_SETTINGS Fixed;
MTRR_VARIABLE_SETTINGS Variables;
UINT64 MtrrDefType;
} MTRR_SETTINGS;
//
// Memory cache types
//
typedef enum {
CacheUncacheable = 0,
CacheWriteCombining = 1,
CacheWriteThrough = 4,
CacheWriteProtected = 5,
CacheWriteBack = 6
} MTRR_MEMORY_CACHE_TYPE;
#define MTRR_CACHE_UNCACHEABLE 0
#define MTRR_CACHE_WRITE_COMBINING 1
#define MTRR_CACHE_WRITE_THROUGH 4
#define MTRR_CACHE_WRITE_PROTECTED 5
#define MTRR_CACHE_WRITE_BACK 6
#define MTRR_CACHE_INVALID_TYPE 7
/**
This function attempts to set the attributes for a memory range.
@param BaseAddress The physical address that is the start address of a memory region.
@param Length The size in bytes of the memory region.
@param Attributes The bit mask of attributes to set for the memory region.
@retval RETURN_SUCCESS The attributes were set for the memory region.
@retval RETURN_INVALID_PARAMETER Length is zero.
@retval RETURN_UNSUPPORTED The processor does not support one or more bytes of the
memory resource range specified by BaseAddress and Length.
@retval RETURN_UNSUPPORTED The bit mask of attributes is not support for the memory resource
range specified by BaseAddress and Length.
@retval RETURN_ACCESS_DENIED The attributes for the memory resource range specified by
BaseAddress and Length cannot be modified.
@retval RETURN_OUT_OF_RESOURCES There are not enough system resources to modify the attributes of
the memory resource range.
**/
RETURN_STATUS
EFIAPI
MtrrSetMemoryAttribute (
IN PHYSICAL_ADDRESS BaseAddress,
IN UINT64 Length,
IN MTRR_MEMORY_CACHE_TYPE Attribute
);
/**
This function will get the memory cache type of the specific address.
This function is mainly for debugging purposes.
@param Address The specific address
@return The memory cache type of the specific address
**/
MTRR_MEMORY_CACHE_TYPE
EFIAPI
MtrrGetMemoryAttribute (
IN PHYSICAL_ADDRESS Address
);
/**
This function will get the raw value in variable MTRRs
@param VariableSettings A buffer to hold variable MTRRs content.
@return The buffer point to MTRR_VARIABLE_SETTINGS in which holds the content of the variable mtrr
**/
MTRR_VARIABLE_SETTINGS*
EFIAPI
MtrrGetVariableMtrr (
OUT MTRR_VARIABLE_SETTINGS *VariableSettings
);
/**
This function sets fixed MTRRs
@param VariableSettings A buffer to hold variable MTRRs content.
@return The pointer of VariableSettings
**/
MTRR_VARIABLE_SETTINGS*
EFIAPI
MtrrSetVariableMtrr (
IN MTRR_VARIABLE_SETTINGS *VariableSettings
);
/**
This function gets the content in fixed MTRRs
@param FixedSettings A buffer to hold fixed MTRRs content.
@return The pointer of FixedSettings
**/
MTRR_FIXED_SETTINGS*
EFIAPI
MtrrGetFixedMtrr (
OUT MTRR_FIXED_SETTINGS *FixedSettings
);
/**
This function sets fixed MTRRs
@param FixedSettings A buffer holding fixed MTRRs content.
@return The pointer of FixedSettings
**/
MTRR_FIXED_SETTINGS*
EFIAPI
MtrrSetFixedMtrr (
IN MTRR_FIXED_SETTINGS *FixedSettings
);
/**
This function gets the content in all MTRRs (variable and fixed)
@param MtrrSetting A buffer to hold all MTRRs content.
@return The pointer of MtrrSetting
**/
MTRR_SETTINGS *
EFIAPI
MtrrGetAllMtrrs (
OUT MTRR_SETTINGS *MtrrSetting
);
/**
This function sets all MTRRs (variable and fixed)
@param MtrrSetting A buffer to hold all MTRRs content.
@return The pointer of MtrrSetting
**/
MTRR_SETTINGS *
EFIAPI
MtrrSetAllMtrrs (
IN MTRR_SETTINGS *MtrrSetting
);
/**
Get the attribute of variable MTRRs.
This function shadows the content of variable MTRRs into
an internal array: VariableMtrr
@param MtrrValidBitsMask The mask for the valid bit of the MTRR
@param MtrrValidAddressMask The valid address mask for MTRR since the base address in
MTRR must align to 4K, so valid address mask equal to
MtrrValidBitsMask & 0xfffffffffffff000ULL
@param VariableMtrr The array to shadow variable MTRRs content
@return The ruturn value of this paramter indicates the number of
MTRRs which has been used.
**/
UINT32
EFIAPI
MtrrGetMemoryAttributeInVariableMtrr (
IN UINT64 MtrrValidBitsMask,
IN UINT64 MtrrValidAddressMask,
OUT VARIABLE_MTRR *VariableMtrr
);
/**
This function prints all MTRRs for debugging.
**/
VOID
MtrrDebugPrintAllMtrrs (
);
#endif // _MTRR_LIB_H_
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