Fix DMA does not work issue when system memory is not
greater than 4G.
Cc: Jiewen Yao <[email protected]>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <[email protected]>
---
IntelSiliconPkg/Feature/VTd/IntelVTdDxe/TranslationTable.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/TranslationTable.c
b/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/TranslationTable.c
index cecb5d23efbf..7f64d5e418f6 100644
--- a/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/TranslationTable.c
+++ b/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/TranslationTable.c
@@ -286,11 +286,14 @@ CreateSecondLevelPagingEntry (
if (SecondLevelPagingEntry == NULL) {
return NULL;
}
- SecondLevelPagingEntry = CreateSecondLevelPagingEntryTable (VtdIndex,
SecondLevelPagingEntry, SIZE_4GB, mAbove4GMemoryLimit, IoMmuAccess);
- if (SecondLevelPagingEntry == NULL) {
- return NULL;
- }
+ if (mAbove4GMemoryLimit != 0) {
+ ASSERT (mAbove4GMemoryLimit > BASE_4GB);
+ SecondLevelPagingEntry = CreateSecondLevelPagingEntryTable (VtdIndex,
SecondLevelPagingEntry, SIZE_4GB, mAbove4GMemoryLimit, IoMmuAccess);
+ if (SecondLevelPagingEntry == NULL) {
+ return NULL;
+ }
+ }
return SecondLevelPagingEntry;
}
--
2.7.0.windows.1
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