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ArmPkg/CpuDxe: Fix MMU initialization problem 

During Mmu initialization in the CpuDxe, for a page table any bits set
in the 'NextSectionAttributes' are garbage and were set from bits that
are actually part of the pagetable address.  We clear it out to zero
so that the SyncCacheConfigPage will use the page attributes instead
of trying to convert the (bogus) section attributes into page
attributes.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Kurt Kennett <kurt.kennett@microsoft.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
This commit is contained in:
Kurt Kennett 2016-09-26 22:45:02 +00:00 committed by Ard Biesheuvel
parent 7188b4557a
commit f6be48e990
1 changed files with 5 additions and 0 deletions
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5
ArmPkg/Drivers/CpuDxe/Arm/Mmu.c
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@ -297,6 +297,11 @@ SyncCacheConfig (
}
NextRegionLength += TT_DESCRIPTOR_SECTION_SIZE;
} else if (TT_DESCRIPTOR_SECTION_TYPE_IS_PAGE_TABLE(FirstLevelTable[i])) {
// In this case any bits set in the 'NextSectionAttributes' are garbage and were set from
// bits that are actually part of the pagetable address. We clear it out to zero so that
// the SyncCacheConfigPage will use the page attributes instead of trying to convert the
// section attributes into page attributes
NextSectionAttributes = 0;
Status = SyncCacheConfigPage (
i,FirstLevelTable[i],
NumberOfDescriptors, MemorySpaceMap,