diff options
| author | Michael Kinney <michael.d.kinney@intel.com> | 2015-12-10 07:27:38 +0000 |
|---|---|---|
| committer | vanjeff <vanjeff@Edk2> | 2015-12-10 07:27:38 +0000 |
| commit | 8e01b4c503c12a00c328cd96d5fbaca818e47980 (patch) | |
| tree | 72ec399f0e9fd3d0429e92521d1d9b39d4132151 /UefiCpuPkg/Include | |
| parent | cefdb9e78a5c24e34d66214b659f2b5f5b42f875 (diff) | |
| download | edk2-platforms-8e01b4c503c12a00c328cd96d5fbaca818e47980.tar.xz | |
UefiCpuPkg/MtrrLib: Add MtrrSetMemoryAttributeInMtrrSettings()
Add new API MtrrSetMemoryAttributeInMtrrSettings() in MtrrLib. Platform could
use this API to set MTRR setting into local MTRR settings buffer instead of
MTRRs. At last, platform could use MtrrSetAllMtrrs() to set the MTRR settings
into MTRRs totally. It could improve MTRRs programming performance obviously,
specially when platform is going to program a set of MTRRs.
(Sync patch r19162 from main trunk.)
Cc: Feng Tian <feng.tian@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/branches/UDK2015@19206 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'UefiCpuPkg/Include')
| -rw-r--r-- | UefiCpuPkg/Include/Library/MtrrLib.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/UefiCpuPkg/Include/Library/MtrrLib.h b/UefiCpuPkg/Include/Library/MtrrLib.h index 884c7bb699..36cd2cd6d5 100644 --- a/UefiCpuPkg/Include/Library/MtrrLib.h +++ b/UefiCpuPkg/Include/Library/MtrrLib.h @@ -352,4 +352,35 @@ MtrrGetDefaultMemoryType ( VOID
);
+/**
+ This function attempts to set the attributes into MTRR setting buffer for a memory range.
+
+ @param[in, out] MtrrSetting MTRR setting buffer to be set.
+ @param[in] BaseAddress The physical address that is the start address
+ of a memory region.
+ @param[in] Length The size in bytes of the memory region.
+ @param[in] Attribute 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
+MtrrSetMemoryAttributeInMtrrSettings (
+ IN OUT MTRR_SETTINGS *MtrrSetting,
+ IN PHYSICAL_ADDRESS BaseAddress,
+ IN UINT64 Length,
+ IN MTRR_MEMORY_CACHE_TYPE Attribute
+ );
+
#endif // _MTRR_LIB_H_
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