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UefiCpuPkg/MtrrLib: Add MtrrSetMemoryAttributeInMtrrSettings()

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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.

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/trunk/edk2@19162 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Michael Kinney
2015-12-08 05:26:26 +00:00
committed by vanjeff
parent 16c2d37e9a
commit b970ed6829
2 changed files with 151 additions and 20 deletions
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31
UefiCpuPkg/Include/Library/MtrrLib.h
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@@ -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_