[mirror_edk2.git] / UefiCpuPkg / Include / Library / MtrrLib.h

/** @file\r
  MTRR setting library\r
\r
  Copyright (c) 2008 - 2017, Intel Corporation. All rights reserved.<BR>\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#ifndef  _MTRR_LIB_H_\r
#define  _MTRR_LIB_H_\r
\r
//\r
// According to IA32 SDM, MTRRs number and MSR offset are always consistent\r
// for IA32 processor family\r
//\r
\r
//\r
// The semantics of below macro is MAX_MTRR_NUMBER_OF_VARIABLE_MTRR, the real number can be read out from MTRR_CAP register.\r
//\r
#define  MTRR_NUMBER_OF_VARIABLE_MTRR  32\r
//\r
// Firmware need reserve 2 MTRR for OS\r
// Note: It is replaced by PCD PcdCpuNumberOfReservedVariableMtrrs\r
//\r
#define  RESERVED_FIRMWARE_VARIABLE_MTRR_NUMBER  2\r
\r
#define  MTRR_NUMBER_OF_FIXED_MTRR      11\r
\r
//\r
// Structure to describe a fixed MTRR\r
//\r
typedef struct {\r
  UINT32  Msr;\r
  UINT32  BaseAddress;\r
  UINT32  Length;\r
} FIXED_MTRR;\r
\r
//\r
// Structure to describe a variable MTRR\r
//\r
typedef struct {\r
  UINT64  BaseAddress;\r
  UINT64  Length;\r
  UINT64  Type;\r
  UINT32  Msr;\r
  BOOLEAN Valid;\r
  BOOLEAN Used;\r
} VARIABLE_MTRR;\r
\r
//\r
// Structure to hold base and mask pair for variable MTRR register\r
//\r
typedef struct _MTRR_VARIABLE_SETTING_ {\r
  UINT64    Base;\r
  UINT64    Mask;\r
} MTRR_VARIABLE_SETTING;\r
\r
//\r
// Array for variable MTRRs\r
//\r
typedef struct _MTRR_VARIABLE_SETTINGS_ {\r
  MTRR_VARIABLE_SETTING   Mtrr[MTRR_NUMBER_OF_VARIABLE_MTRR];\r
} MTRR_VARIABLE_SETTINGS;\r
\r
//\r
// Array for fixed MTRRs\r
//\r
typedef  struct  _MTRR_FIXED_SETTINGS_ {\r
  UINT64       Mtrr[MTRR_NUMBER_OF_FIXED_MTRR];\r
} MTRR_FIXED_SETTINGS;\r
\r
//\r
// Structure to hold all MTRRs\r
//\r
typedef struct _MTRR_SETTINGS_ {\r
  MTRR_FIXED_SETTINGS       Fixed;\r
  MTRR_VARIABLE_SETTINGS    Variables;\r
  UINT64                    MtrrDefType;\r
} MTRR_SETTINGS;\r
\r
//\r
// Memory cache types\r
//\r
typedef enum {\r
  CacheUncacheable    = 0,\r
  CacheWriteCombining = 1,\r
  CacheWriteThrough   = 4,\r
  CacheWriteProtected = 5,\r
  CacheWriteBack      = 6,\r
  CacheInvalid        = 7\r
} MTRR_MEMORY_CACHE_TYPE;\r
\r
#define  MTRR_CACHE_UNCACHEABLE      0\r
#define  MTRR_CACHE_WRITE_COMBINING  1\r
#define  MTRR_CACHE_WRITE_THROUGH    4\r
#define  MTRR_CACHE_WRITE_PROTECTED  5\r
#define  MTRR_CACHE_WRITE_BACK       6\r
#define  MTRR_CACHE_INVALID_TYPE     7\r
\r
typedef struct {\r
  UINT64                 BaseAddress;\r
  UINT64                 Length;\r
  MTRR_MEMORY_CACHE_TYPE Type;\r
} MTRR_MEMORY_RANGE;\r
\r
/**\r
  Returns the variable MTRR count for the CPU.\r
\r
  @return Variable MTRR count\r
\r
**/\r
UINT32\r
EFIAPI\r
GetVariableMtrrCount (\r
  VOID\r
  );\r
\r
/**\r
  Returns the firmware usable variable MTRR count for the CPU.\r
\r
  @return Firmware usable variable MTRR count\r
\r
**/\r
UINT32\r
EFIAPI\r
GetFirmwareVariableMtrrCount (\r
  VOID\r
  );\r
\r
/**\r
  This function attempts to set the attributes for a memory range.\r
\r
  @param[in]       BaseAddress       The physical address that is the start\r
                                     address of a memory region.\r
  @param[in]       Length            The size in bytes of the memory region.\r
  @param[in]       Attribute         The bit mask of attributes to set for the\r
                                     memory region.\r
\r
  @retval RETURN_SUCCESS            The attributes were set for the memory\r
                                    region.\r
  @retval RETURN_INVALID_PARAMETER  Length is zero.\r
  @retval RETURN_UNSUPPORTED        The processor does not support one or\r
                                    more bytes of the memory resource range\r
                                    specified by BaseAddress and Length.\r
  @retval RETURN_UNSUPPORTED        The bit mask of attributes is not support\r
                                    for the memory resource range specified\r
                                    by BaseAddress and Length.\r
  @retval RETURN_ACCESS_DENIED      The attributes for the memory resource\r
                                    range specified by BaseAddress and Length\r
                                    cannot be modified.\r
  @retval RETURN_OUT_OF_RESOURCES   There are not enough system resources to\r
                                    modify the attributes of the memory\r
                                    resource range.\r
  @retval RETURN_BUFFER_TOO_SMALL   The scratch buffer is too small for MTRR calculation.\r
**/\r
RETURN_STATUS\r
EFIAPI\r
MtrrSetMemoryAttribute (\r
  IN PHYSICAL_ADDRESS        BaseAddress,\r
  IN UINT64                  Length,\r
  IN MTRR_MEMORY_CACHE_TYPE  Attribute\r
  );\r
\r
\r
/**\r
  This function will get the memory cache type of the specific address.\r
  This function is mainly for debugging purposes.\r
\r
  @param[in]  Address            The specific address\r
\r
  @return The memory cache type of the specific address\r
\r
**/\r
MTRR_MEMORY_CACHE_TYPE\r
EFIAPI\r
MtrrGetMemoryAttribute (\r
  IN PHYSICAL_ADDRESS   Address\r
  );\r
\r
\r
/**\r
  This function will get the raw value in variable MTRRs\r
\r
  @param[out]  VariableSettings   A buffer to hold variable MTRRs content.\r
\r
  @return The buffer point to MTRR_VARIABLE_SETTINGS in which holds the content of the variable MTRR\r
\r
**/\r
MTRR_VARIABLE_SETTINGS*\r
EFIAPI\r
MtrrGetVariableMtrr (\r
  OUT MTRR_VARIABLE_SETTINGS         *VariableSettings\r
  );\r
\r
\r
/**\r
  This function sets variable MTRRs\r
\r
  @param[in]  VariableSettings   A buffer to hold variable MTRRs content.\r
\r
  @return The pointer of VariableSettings\r
\r
**/\r
MTRR_VARIABLE_SETTINGS*\r
EFIAPI\r
MtrrSetVariableMtrr (\r
  IN MTRR_VARIABLE_SETTINGS         *VariableSettings\r
  );\r
\r
\r
/**\r
  This function gets the content in fixed MTRRs\r
\r
  @param[out]  FixedSettings      A buffer to hold fixed MTRRs content.\r
\r
  @return The pointer of FixedSettings\r
\r
**/\r
MTRR_FIXED_SETTINGS*\r
EFIAPI\r
MtrrGetFixedMtrr (\r
  OUT MTRR_FIXED_SETTINGS         *FixedSettings\r
  );\r
\r
\r
/**\r
  This function sets fixed MTRRs\r
\r
  @param[in]   FixedSettings      A buffer holding fixed MTRRs content.\r
\r
  @return  The pointer of FixedSettings\r
\r
**/\r
MTRR_FIXED_SETTINGS*\r
EFIAPI\r
MtrrSetFixedMtrr (\r
  IN MTRR_FIXED_SETTINGS          *FixedSettings\r
  );\r
\r
\r
/**\r
  This function gets the content in all MTRRs (variable and fixed)\r
\r
  @param[out]  MtrrSetting   A buffer to hold all MTRRs content.\r
\r
  @return The pointer of MtrrSetting\r
\r
**/\r
MTRR_SETTINGS *\r
EFIAPI\r
MtrrGetAllMtrrs (\r
  OUT MTRR_SETTINGS                *MtrrSetting\r
  );\r
\r
\r
/**\r
  This function sets all MTRRs (variable and fixed)\r
\r
  @param[in]  MtrrSetting   A buffer to hold all MTRRs content.\r
\r
  @return The pointer of MtrrSetting\r
\r
**/\r
MTRR_SETTINGS *\r
EFIAPI\r
MtrrSetAllMtrrs (\r
  IN MTRR_SETTINGS                *MtrrSetting\r
  );\r
\r
\r
/**\r
  Get the attribute of variable MTRRs.\r
\r
  This function shadows the content of variable MTRRs into\r
  an internal array: VariableMtrr\r
\r
  @param[in]   MtrrValidBitsMask    The mask for the valid bit of the MTRR\r
  @param[in]   MtrrValidAddressMask The valid address mask for MTRR since the base address in\r
                                    MTRR must align to 4K, so valid address mask equal to\r
                                    MtrrValidBitsMask & 0xfffffffffffff000ULL\r
  @param[out]  VariableMtrr         The array to shadow variable MTRRs content\r
\r
  @return                       The return value of this parameter indicates the number of\r
                                MTRRs which has been used.\r
**/\r
UINT32\r
EFIAPI\r
MtrrGetMemoryAttributeInVariableMtrr (\r
  IN  UINT64                    MtrrValidBitsMask,\r
  IN  UINT64                    MtrrValidAddressMask,\r
  OUT VARIABLE_MTRR             *VariableMtrr\r
  );\r
\r
\r
/**\r
  This function prints all MTRRs for debugging.\r
**/\r
VOID\r
EFIAPI\r
MtrrDebugPrintAllMtrrs (\r
  VOID\r
  );\r
\r
/**\r
  Checks if MTRR is supported.\r
\r
  @retval TRUE  MTRR is supported.\r
  @retval FALSE MTRR is not supported.\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
IsMtrrSupported (\r
  VOID\r
  );\r
\r
/**\r
  Returns the default MTRR cache type for the system.\r
\r
  @return  The default MTRR cache type.\r
\r
**/\r
MTRR_MEMORY_CACHE_TYPE\r
EFIAPI\r
MtrrGetDefaultMemoryType (\r
  VOID\r
  );\r
\r
/**\r
  This function attempts to set the attributes into MTRR setting buffer for a memory range.\r
\r
  @param[in, out]  MtrrSetting  MTRR setting buffer to be set.\r
  @param[in]       BaseAddress  The physical address that is the start address\r
                                of a memory region.\r
  @param[in]       Length       The size in bytes of the memory region.\r
  @param[in]       Attribute    The bit mask of attributes to set for the\r
                                memory region.\r
\r
  @retval RETURN_SUCCESS            The attributes were set for the memory region.\r
  @retval RETURN_INVALID_PARAMETER  Length is zero.\r
  @retval RETURN_UNSUPPORTED        The processor does not support one or more bytes of the\r
                                    memory resource range specified by BaseAddress and Length.\r
  @retval RETURN_UNSUPPORTED        The bit mask of attributes is not support for the memory resource\r
                                    range specified by BaseAddress and Length.\r
  @retval RETURN_ACCESS_DENIED      The attributes for the memory resource range specified by\r
                                    BaseAddress and Length cannot be modified.\r
  @retval RETURN_OUT_OF_RESOURCES   There are not enough system resources to modify the attributes of\r
                                    the memory resource range.\r
  @retval RETURN_BUFFER_TOO_SMALL   The scratch buffer is too small for MTRR calculation.\r
**/\r
RETURN_STATUS\r
EFIAPI\r
MtrrSetMemoryAttributeInMtrrSettings (\r
  IN OUT MTRR_SETTINGS       *MtrrSetting,\r
  IN PHYSICAL_ADDRESS        BaseAddress,\r
  IN UINT64                  Length,\r
  IN MTRR_MEMORY_CACHE_TYPE  Attribute\r
  );\r
\r
/**\r
  This function attempts to set the attributes into MTRR setting buffer for multiple memory ranges.\r
\r
  @param[in, out]  MtrrSetting  MTRR setting buffer to be set.\r
  @param[in]       Scratch      A temporary scratch buffer that is used to perform the calculation.\r
  @param[in, out]  ScratchSize  Pointer to the size in bytes of the scratch buffer.\r
                                It may be updated to the actual required size when the calculation\r
                                needs more scratch buffer.\r
  @param[in]       Ranges       Pointer to an array of MTRR_MEMORY_RANGE.\r
                                When range overlap happens, the last one takes higher priority.\r
                                When the function returns, either all the attributes are set successfully,\r
                                or none of them is set.\r
  @param[in]      RangeCount    Count of MTRR_MEMORY_RANGE.\r
\r
  @retval RETURN_SUCCESS            The attributes were set for all the memory ranges.\r
  @retval RETURN_INVALID_PARAMETER  Length in any range is zero.\r
  @retval RETURN_UNSUPPORTED        The processor does not support one or more bytes of the\r
                                    memory resource range specified by BaseAddress and Length in any range.\r
  @retval RETURN_UNSUPPORTED        The bit mask of attributes is not support for the memory resource\r
                                    range specified by BaseAddress and Length in any range.\r
  @retval RETURN_OUT_OF_RESOURCES   There are not enough system resources to modify the attributes of\r
                                    the memory resource ranges.\r
  @retval RETURN_ACCESS_DENIED      The attributes for the memory resource range specified by\r
                                    BaseAddress and Length cannot be modified.\r
  @retval RETURN_BUFFER_TOO_SMALL   The scratch buffer is too small for MTRR calculation.\r
**/\r
RETURN_STATUS\r
EFIAPI\r
MtrrSetMemoryAttributesInMtrrSettings (\r
  IN OUT MTRR_SETTINGS           *MtrrSetting,\r
  IN     VOID                    *Scratch,\r
  IN OUT UINTN                   *ScratchSize,\r
  IN     CONST MTRR_MEMORY_RANGE *Ranges,\r
  IN     UINTN                   RangeCount\r
  );\r
#endif // _MTRR_LIB_H_\r
Commit	Line	Data
	1	/** @file\r
	2	MTRR setting library\r
	3	\r
	4	Copyright (c) 2008 - 2017, Intel Corporation. All rights reserved.<BR>\r
	5	This program and the accompanying materials\r
	6	are licensed and made available under the terms and conditions of the BSD License\r
	7	which accompanies this distribution. The full text of the license may be found at\r
	8	http://opensource.org/licenses/bsd-license.php\r
	9	\r
	10	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	11	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	12	\r
	13	**/\r
	14	\r
	15	#ifndef _MTRR_LIB_H_\r
	16	#define _MTRR_LIB_H_\r
	17	\r
	18	//\r
	19	// According to IA32 SDM, MTRRs number and MSR offset are always consistent\r
	20	// for IA32 processor family\r
	21	//\r
	22	\r
	23	//\r
	24	// The semantics of below macro is MAX_MTRR_NUMBER_OF_VARIABLE_MTRR, the real number can be read out from MTRR_CAP register.\r
	25	//\r
	26	#define MTRR_NUMBER_OF_VARIABLE_MTRR 32\r
	27	//\r
	28	// Firmware need reserve 2 MTRR for OS\r
	29	// Note: It is replaced by PCD PcdCpuNumberOfReservedVariableMtrrs\r
	30	//\r
	31	#define RESERVED_FIRMWARE_VARIABLE_MTRR_NUMBER 2\r
	32	\r
	33	#define MTRR_NUMBER_OF_FIXED_MTRR 11\r
	34	\r
	35	//\r
	36	// Structure to describe a fixed MTRR\r
	37	//\r
	38	typedef struct {\r
	39	UINT32 Msr;\r
	40	UINT32 BaseAddress;\r
	41	UINT32 Length;\r
	42	} FIXED_MTRR;\r
	43	\r
	44	//\r
	45	// Structure to describe a variable MTRR\r
	46	//\r
	47	typedef struct {\r
	48	UINT64 BaseAddress;\r
	49	UINT64 Length;\r
	50	UINT64 Type;\r
	51	UINT32 Msr;\r
	52	BOOLEAN Valid;\r
	53	BOOLEAN Used;\r
	54	} VARIABLE_MTRR;\r
	55	\r
	56	//\r
	57	// Structure to hold base and mask pair for variable MTRR register\r
	58	//\r
	59	typedef struct _MTRR_VARIABLE_SETTING_ {\r
	60	UINT64 Base;\r
	61	UINT64 Mask;\r
	62	} MTRR_VARIABLE_SETTING;\r
	63	\r
	64	//\r
	65	// Array for variable MTRRs\r
	66	//\r
	67	typedef struct _MTRR_VARIABLE_SETTINGS_ {\r
	68	MTRR_VARIABLE_SETTING Mtrr[MTRR_NUMBER_OF_VARIABLE_MTRR];\r
	69	} MTRR_VARIABLE_SETTINGS;\r
	70	\r
	71	//\r
	72	// Array for fixed MTRRs\r
	73	//\r
	74	typedef struct _MTRR_FIXED_SETTINGS_ {\r
	75	UINT64 Mtrr[MTRR_NUMBER_OF_FIXED_MTRR];\r
	76	} MTRR_FIXED_SETTINGS;\r
	77	\r
	78	//\r
	79	// Structure to hold all MTRRs\r
	80	//\r
	81	typedef struct _MTRR_SETTINGS_ {\r
	82	MTRR_FIXED_SETTINGS Fixed;\r
	83	MTRR_VARIABLE_SETTINGS Variables;\r
	84	UINT64 MtrrDefType;\r
	85	} MTRR_SETTINGS;\r
	86	\r
	87	//\r
	88	// Memory cache types\r
	89	//\r
	90	typedef enum {\r
	91	CacheUncacheable = 0,\r
	92	CacheWriteCombining = 1,\r
	93	CacheWriteThrough = 4,\r
	94	CacheWriteProtected = 5,\r
	95	CacheWriteBack = 6,\r
	96	CacheInvalid = 7\r
	97	} MTRR_MEMORY_CACHE_TYPE;\r
	98	\r
	99	#define MTRR_CACHE_UNCACHEABLE 0\r
	100	#define MTRR_CACHE_WRITE_COMBINING 1\r
	101	#define MTRR_CACHE_WRITE_THROUGH 4\r
	102	#define MTRR_CACHE_WRITE_PROTECTED 5\r
	103	#define MTRR_CACHE_WRITE_BACK 6\r
	104	#define MTRR_CACHE_INVALID_TYPE 7\r
	105	\r
	106	typedef struct {\r
	107	UINT64 BaseAddress;\r
	108	UINT64 Length;\r
	109	MTRR_MEMORY_CACHE_TYPE Type;\r
	110	} MTRR_MEMORY_RANGE;\r
	111	\r
	112	/**\r
	113	Returns the variable MTRR count for the CPU.\r
	114	\r
	115	@return Variable MTRR count\r
	116	\r
	117	**/\r
	118	UINT32\r
	119	EFIAPI\r
	120	GetVariableMtrrCount (\r
	121	VOID\r
	122	);\r
	123	\r
	124	/**\r
	125	Returns the firmware usable variable MTRR count for the CPU.\r
	126	\r
	127	@return Firmware usable variable MTRR count\r
	128	\r
	129	**/\r
	130	UINT32\r
	131	EFIAPI\r
	132	GetFirmwareVariableMtrrCount (\r
	133	VOID\r
	134	);\r
	135	\r
	136	/**\r
	137	This function attempts to set the attributes for a memory range.\r
	138	\r
	139	@param[in] BaseAddress The physical address that is the start\r
	140	address of a memory region.\r
	141	@param[in] Length The size in bytes of the memory region.\r
	142	@param[in] Attribute The bit mask of attributes to set for the\r
	143	memory region.\r
	144	\r
	145	@retval RETURN_SUCCESS The attributes were set for the memory\r
	146	region.\r
	147	@retval RETURN_INVALID_PARAMETER Length is zero.\r
	148	@retval RETURN_UNSUPPORTED The processor does not support one or\r
	149	more bytes of the memory resource range\r
	150	specified by BaseAddress and Length.\r
	151	@retval RETURN_UNSUPPORTED The bit mask of attributes is not support\r
	152	for the memory resource range specified\r
	153	by BaseAddress and Length.\r
	154	@retval RETURN_ACCESS_DENIED The attributes for the memory resource\r
	155	range specified by BaseAddress and Length\r
	156	cannot be modified.\r
	157	@retval RETURN_OUT_OF_RESOURCES There are not enough system resources to\r
	158	modify the attributes of the memory\r
	159	resource range.\r
	160	@retval RETURN_BUFFER_TOO_SMALL The scratch buffer is too small for MTRR calculation.\r
	161	**/\r
	162	RETURN_STATUS\r
	163	EFIAPI\r
	164	MtrrSetMemoryAttribute (\r
	165	IN PHYSICAL_ADDRESS BaseAddress,\r
	166	IN UINT64 Length,\r
	167	IN MTRR_MEMORY_CACHE_TYPE Attribute\r
	168	);\r
	169	\r
	170	\r
	171	/**\r
	172	This function will get the memory cache type of the specific address.\r
	173	This function is mainly for debugging purposes.\r
	174	\r
	175	@param[in] Address The specific address\r
	176	\r
	177	@return The memory cache type of the specific address\r
	178	\r
	179	**/\r
	180	MTRR_MEMORY_CACHE_TYPE\r
	181	EFIAPI\r
	182	MtrrGetMemoryAttribute (\r
	183	IN PHYSICAL_ADDRESS Address\r
	184	);\r
	185	\r
	186	\r
	187	/**\r
	188	This function will get the raw value in variable MTRRs\r
	189	\r
	190	@param[out] VariableSettings A buffer to hold variable MTRRs content.\r
	191	\r
	192	@return The buffer point to MTRR_VARIABLE_SETTINGS in which holds the content of the variable MTRR\r
	193	\r
	194	**/\r
	195	MTRR_VARIABLE_SETTINGS*\r
	196	EFIAPI\r
	197	MtrrGetVariableMtrr (\r
	198	OUT MTRR_VARIABLE_SETTINGS *VariableSettings\r
	199	);\r
	200	\r
	201	\r
	202	/**\r
	203	This function sets variable MTRRs\r
	204	\r
	205	@param[in] VariableSettings A buffer to hold variable MTRRs content.\r
	206	\r
	207	@return The pointer of VariableSettings\r
	208	\r
	209	**/\r
	210	MTRR_VARIABLE_SETTINGS*\r
	211	EFIAPI\r
	212	MtrrSetVariableMtrr (\r
	213	IN MTRR_VARIABLE_SETTINGS *VariableSettings\r
	214	);\r
	215	\r
	216	\r
	217	/**\r
	218	This function gets the content in fixed MTRRs\r
	219	\r
	220	@param[out] FixedSettings A buffer to hold fixed MTRRs content.\r
	221	\r
	222	@return The pointer of FixedSettings\r
	223	\r
	224	**/\r
	225	MTRR_FIXED_SETTINGS*\r
	226	EFIAPI\r
	227	MtrrGetFixedMtrr (\r
	228	OUT MTRR_FIXED_SETTINGS *FixedSettings\r
	229	);\r
	230	\r
	231	\r
	232	/**\r
	233	This function sets fixed MTRRs\r
	234	\r
	235	@param[in] FixedSettings A buffer holding fixed MTRRs content.\r
	236	\r
	237	@return The pointer of FixedSettings\r
	238	\r
	239	**/\r
	240	MTRR_FIXED_SETTINGS*\r
	241	EFIAPI\r
	242	MtrrSetFixedMtrr (\r
	243	IN MTRR_FIXED_SETTINGS *FixedSettings\r
	244	);\r
	245	\r
	246	\r
	247	/**\r
	248	This function gets the content in all MTRRs (variable and fixed)\r
	249	\r
	250	@param[out] MtrrSetting A buffer to hold all MTRRs content.\r
	251	\r
	252	@return The pointer of MtrrSetting\r
	253	\r
	254	**/\r
	255	MTRR_SETTINGS *\r
	256	EFIAPI\r
	257	MtrrGetAllMtrrs (\r
	258	OUT MTRR_SETTINGS *MtrrSetting\r
	259	);\r
	260	\r
	261	\r
	262	/**\r
	263	This function sets all MTRRs (variable and fixed)\r
	264	\r
	265	@param[in] MtrrSetting A buffer to hold all MTRRs content.\r
	266	\r
	267	@return The pointer of MtrrSetting\r
	268	\r
	269	**/\r
	270	MTRR_SETTINGS *\r
	271	EFIAPI\r
	272	MtrrSetAllMtrrs (\r
	273	IN MTRR_SETTINGS *MtrrSetting\r
	274	);\r
	275	\r
	276	\r
	277	/**\r
	278	Get the attribute of variable MTRRs.\r
	279	\r
	280	This function shadows the content of variable MTRRs into\r
	281	an internal array: VariableMtrr\r
	282	\r
	283	@param[in] MtrrValidBitsMask The mask for the valid bit of the MTRR\r
	284	@param[in] MtrrValidAddressMask The valid address mask for MTRR since the base address in\r
	285	MTRR must align to 4K, so valid address mask equal to\r
	286	MtrrValidBitsMask & 0xfffffffffffff000ULL\r
	287	@param[out] VariableMtrr The array to shadow variable MTRRs content\r
	288	\r
	289	@return The return value of this parameter indicates the number of\r
	290	MTRRs which has been used.\r
	291	**/\r
	292	UINT32\r
	293	EFIAPI\r
	294	MtrrGetMemoryAttributeInVariableMtrr (\r
	295	IN UINT64 MtrrValidBitsMask,\r
	296	IN UINT64 MtrrValidAddressMask,\r
	297	OUT VARIABLE_MTRR *VariableMtrr\r
	298	);\r
	299	\r
	300	\r
	301	/**\r
	302	This function prints all MTRRs for debugging.\r
	303	**/\r
	304	VOID\r
	305	EFIAPI\r
	306	MtrrDebugPrintAllMtrrs (\r
	307	VOID\r
	308	);\r
	309	\r
	310	/**\r
	311	Checks if MTRR is supported.\r
	312	\r
	313	@retval TRUE MTRR is supported.\r
	314	@retval FALSE MTRR is not supported.\r
	315	\r
	316	**/\r
	317	BOOLEAN\r
	318	EFIAPI\r
	319	IsMtrrSupported (\r
	320	VOID\r
	321	);\r
	322	\r
	323	/**\r
	324	Returns the default MTRR cache type for the system.\r
	325	\r
	326	@return The default MTRR cache type.\r
	327	\r
	328	**/\r
	329	MTRR_MEMORY_CACHE_TYPE\r
	330	EFIAPI\r
	331	MtrrGetDefaultMemoryType (\r
	332	VOID\r
	333	);\r
	334	\r
	335	/**\r
	336	This function attempts to set the attributes into MTRR setting buffer for a memory range.\r
	337	\r
	338	@param[in, out] MtrrSetting MTRR setting buffer to be set.\r
	339	@param[in] BaseAddress The physical address that is the start address\r
	340	of a memory region.\r
	341	@param[in] Length The size in bytes of the memory region.\r
	342	@param[in] Attribute The bit mask of attributes to set for the\r
	343	memory region.\r
	344	\r
	345	@retval RETURN_SUCCESS The attributes were set for the memory region.\r
	346	@retval RETURN_INVALID_PARAMETER Length is zero.\r
	347	@retval RETURN_UNSUPPORTED The processor does not support one or more bytes of the\r
	348	memory resource range specified by BaseAddress and Length.\r
	349	@retval RETURN_UNSUPPORTED The bit mask of attributes is not support for the memory resource\r
	350	range specified by BaseAddress and Length.\r
	351	@retval RETURN_ACCESS_DENIED The attributes for the memory resource range specified by\r
	352	BaseAddress and Length cannot be modified.\r
	353	@retval RETURN_OUT_OF_RESOURCES There are not enough system resources to modify the attributes of\r
	354	the memory resource range.\r
	355	@retval RETURN_BUFFER_TOO_SMALL The scratch buffer is too small for MTRR calculation.\r
	356	**/\r
	357	RETURN_STATUS\r
	358	EFIAPI\r
	359	MtrrSetMemoryAttributeInMtrrSettings (\r
	360	IN OUT MTRR_SETTINGS *MtrrSetting,\r
	361	IN PHYSICAL_ADDRESS BaseAddress,\r
	362	IN UINT64 Length,\r
	363	IN MTRR_MEMORY_CACHE_TYPE Attribute\r
	364	);\r
	365	\r
	366	/**\r
	367	This function attempts to set the attributes into MTRR setting buffer for multiple memory ranges.\r
	368	\r
	369	@param[in, out] MtrrSetting MTRR setting buffer to be set.\r
	370	@param[in] Scratch A temporary scratch buffer that is used to perform the calculation.\r
	371	@param[in, out] ScratchSize Pointer to the size in bytes of the scratch buffer.\r
	372	It may be updated to the actual required size when the calculation\r
	373	needs more scratch buffer.\r
	374	@param[in] Ranges Pointer to an array of MTRR_MEMORY_RANGE.\r
	375	When range overlap happens, the last one takes higher priority.\r
	376	When the function returns, either all the attributes are set successfully,\r
	377	or none of them is set.\r
	378	@param[in] RangeCount Count of MTRR_MEMORY_RANGE.\r
	379	\r
	380	@retval RETURN_SUCCESS The attributes were set for all the memory ranges.\r
	381	@retval RETURN_INVALID_PARAMETER Length in any range is zero.\r
	382	@retval RETURN_UNSUPPORTED The processor does not support one or more bytes of the\r
	383	memory resource range specified by BaseAddress and Length in any range.\r
	384	@retval RETURN_UNSUPPORTED The bit mask of attributes is not support for the memory resource\r
	385	range specified by BaseAddress and Length in any range.\r
	386	@retval RETURN_OUT_OF_RESOURCES There are not enough system resources to modify the attributes of\r
	387	the memory resource ranges.\r
	388	@retval RETURN_ACCESS_DENIED The attributes for the memory resource range specified by\r
	389	BaseAddress and Length cannot be modified.\r
	390	@retval RETURN_BUFFER_TOO_SMALL The scratch buffer is too small for MTRR calculation.\r
	391	**/\r
	392	RETURN_STATUS\r
	393	EFIAPI\r
	394	MtrrSetMemoryAttributesInMtrrSettings (\r
	395	IN OUT MTRR_SETTINGS *MtrrSetting,\r
	396	IN VOID *Scratch,\r
	397	IN OUT UINTN *ScratchSize,\r
	398	IN CONST MTRR_MEMORY_RANGE *Ranges,\r
	399	IN UINTN RangeCount\r
	400	);\r
	401	#endif // _MTRR_LIB_H_\r