sravan/system76-edk2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

1. Introduce the API MtrrGetDefaultMemoryType () in Mtrr Library.

Browse Source 
2. Invoke MtrrGetDefaultMemoryType() to get the default memory type instead of the hard code value in module.
3. Add go though for UC attributes.

Signed-off-by: vanjeff
Reviewed-by: rsun3

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12587 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
vanjeff
2011-10-28 06:01:55 +00:00
parent beda2356f5
commit 91ec78241c
3 changed files with 53 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
UefiCpuPkg/Library/MtrrLib/MtrrLib.c
View File

@@ -144,17 +144,21 @@ GetFirmwareVariableMtrrCount (
/**
Returns the default MTRR cache type for the system.
@return MTRR default type
@return The default MTRR cache type.
**/
UINT64
GetMtrrDefaultMemoryType (
MTRR_MEMORY_CACHE_TYPE
EFIAPI
MtrrGetDefaultMemoryType (
VOID
)
)
{
return (AsmReadMsr64 (MTRR_LIB_IA32_MTRR_DEF_TYPE) & 0xff);
}
if (!IsMtrrSupported ()) {
return CacheUncacheable;
}
return (MTRR_MEMORY_CACHE_TYPE) (AsmReadMsr64 (MTRR_LIB_IA32_MTRR_DEF_TYPE) & 0x7);
}
/**
Preparation before programming MTRR.
@@ -1036,7 +1040,7 @@ MtrrSetMemoryAttribute (
// The memory type is the same with the type specified by
// MTRR_LIB_IA32_MTRR_DEF_TYPE.
//
if ((!OverwriteExistingMtrr) && (Attribute == GetMtrrDefaultMemoryType ())) {
if ((!OverwriteExistingMtrr) && (Attribute == MtrrGetDefaultMemoryType ())) {
//
// Invalidate the now-unused MTRRs
//