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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2016-04-19 16:19:02 +0200
committerArd Biesheuvel <ard.biesheuvel@linaro.org>2016-05-10 14:44:39 +0200
commit885d57ef091fd58916163e79ee694ddaf8fcc25e (patch)
treebc9bab8f8f3ff5a41b836557ef1f5e2d59abdcf0 /ArmPkg
parent80e5a33da1fcbe54cbcc178f1880e80e297d5fd4 (diff)
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ArmPkg/ArmDmaLib: interpret GCD attributes as a bit field
Comparing a GCD attribute field directly against EFI_MEMORY_UC and EFI_MEMORY_WT is incorrect, since it may have other bits set as well which are not related to the cacheability of the region. So instead, test explicitly against the flags EFI_MEMORY_WB and EFI_MEMORY_WT, which must be set if the region may be mapped with cacheable attributes. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Diffstat (limited to 'ArmPkg')
-rw-r--r--ArmPkg/Library/ArmDmaLib/ArmDmaLib.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c b/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c
index 66f3469eb1..2144699c08 100644
--- a/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c
+++ b/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c
@@ -102,9 +102,7 @@ DmaMap (
}
// If the mapped buffer is not an uncached buffer
- if ( (GcdDescriptor.Attributes != EFI_MEMORY_WC) &&
- (GcdDescriptor.Attributes != EFI_MEMORY_UC) )
- {
+ if ((GcdDescriptor.Attributes & (EFI_MEMORY_WB | EFI_MEMORY_WT)) != 0) {
//
// If the buffer does not fill entire cache lines we must double buffer into
// uncached memory. Device (PCI) address becomes uncached page.