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ArmPkg/ArmV7Mmu: handle memory regions over 4 GB correctly 

The ARM_MEMORY_REGION_DESCRIPTOR array provided by the platform may
contain entries that extend beyond the 4 GB boundary, above which
we can't map anything on 32-bit ARM. If this is the case, map only
the 1:1 addressable part.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18900 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ard Biesheuvel 2015-11-18 16:18:40 +00:00 committed by abiesheuvel
parent 72143137f4
commit 55df704dd2
1 changed files with 9 additions and 2 deletions
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11
ArmPkg/Library/ArmLib/ArmV7/ArmV7Mmu.c
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@ -147,11 +147,18 @@ FillTranslationTable (
{
UINT32 *SectionEntry;
UINT32 Attributes;
UINT32 PhysicalBase = MemoryRegion->PhysicalBase;
UINT32 RemainLength = MemoryRegion->Length;
UINT32 PhysicalBase;
UINT32 RemainLength;
ASSERT(MemoryRegion->Length > 0);
if (MemoryRegion->PhysicalBase >= SIZE_4GB) {
return;
}
PhysicalBase = MemoryRegion->PhysicalBase;
RemainLength = MIN(MemoryRegion->Length, SIZE_4GB - PhysicalBase);
switch (MemoryRegion->Attributes) {
case ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK:
Attributes = TT_DESCRIPTOR_SECTION_WRITE_BACK(0);