diff options
| author | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-08-31 16:24:01 +0000 |
|---|---|---|
| committer | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-08-31 16:24:01 +0000 |
| commit | 3f5aa1932f6a453981d9cab353b0340268b97808 (patch) | |
| tree | 7955a5d47855744fbc0ec13934818bf42358ab1b /ArmPkg/Library/ArmDmaLib/ArmDmaLib.c | |
| parent | f1660263de092b5596a7e97f5359877eca9cb974 (diff) | |
| download | edk2-platforms-3f5aa1932f6a453981d9cab353b0340268b97808.tar.xz | |
ArmPkg: Changed Uncached System Memory from EFI_MEMORY_UC to EFI_MEMORY_WC
EFI_MEMORY_UC is mapped to Strongly Ordered memory while EFI_MEMORY_WC is
mapped to Uncached Normal/System memory.
This change improve performance while accessing uncached regions in the
System Memory.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Eugene Cohen <eugene@hp.com>
Reviewed-by: Olivier Martin <oliviermartin@arm.com
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13693 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'ArmPkg/Library/ArmDmaLib/ArmDmaLib.c')
| -rwxr-xr-x | ArmPkg/Library/ArmDmaLib/ArmDmaLib.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c b/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c index 4764b4237a..074e3c1255 100755 --- a/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c +++ b/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c @@ -102,7 +102,9 @@ DmaMap ( }
// If the mapped buffer is not an uncached buffer
- if (GcdDescriptor.Attributes != EFI_MEMORY_UC) {
+ if ( (GcdDescriptor.Attributes != EFI_MEMORY_WC) &&
+ (GcdDescriptor.Attributes != EFI_MEMORY_UC) )
+ {
//
// If the buffer does not fill entire cache lines we must double buffer into
// uncached memory. Device (PCI) address becomes uncached page.
@@ -129,7 +131,7 @@ DmaMap ( if ((Operation == MapOperationBusMasterRead) || (Operation == MapOperationBusMasterCommonBuffer)) {
// In case the buffer is used for instance to send command to a PCI controller, we must ensure the memory is uncached
- Status = gDS->SetMemorySpaceAttributes (ALIGN_VALUE(*DeviceAddress - BASE_4KB - 1,BASE_4KB), ALIGN_VALUE(*NumberOfBytes,BASE_4KB), EFI_MEMORY_UC);
+ Status = gDS->SetMemorySpaceAttributes (ALIGN_VALUE(*DeviceAddress - BASE_4KB - 1,BASE_4KB), ALIGN_VALUE(*NumberOfBytes,BASE_4KB), EFI_MEMORY_WC);
ASSERT_EFI_ERROR (Status);
}
}
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