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ArmPkg/ArmV7Mmu: introduce feature PCD to map normal memory non-shareable

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Even though mapping normal memory (inner) shareable is usually the
correct choice on coherent systems, it may be desirable in some cases
to use non-shareable mappings for normal memory, e.g., when hardware
managed coherency is not required and the memory system is not fully
configured yet. So introduce a PCD PcdNormalMemoryNonshareableOverride
that makes cacheable mappings of normal memory non-shareable.

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@18897 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ard Biesheuvel
2015-11-18 15:59:22 +00:00
committed by abiesheuvel
parent 07070ecc76
commit 65ceda9173
4 changed files with 33 additions and 9 deletions
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6
ArmPkg/ArmPkg.dec
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@@ -73,6 +73,12 @@
# Define if the GICv3 controller should use the GICv2 legacy
gArmTokenSpaceGuid.PcdArmGicV3WithV2Legacy|FALSE|BOOLEAN|0x00000042
[PcdsFeatureFlag.ARM]
# Whether to map normal memory as non-shareable. FALSE is the safe choice, but
# TRUE may be appropriate to fix performance problems if you don't care about
# hardware coherency (i.e., no virtualization or cache coherent DMA)
gArmTokenSpaceGuid.PcdNormalMemoryNonshareableOverride|FALSE|BOOLEAN|0x00000043
[PcdsFixedAtBuild.common]
gArmTokenSpaceGuid.PcdTrustzoneSupport|FALSE|BOOLEAN|0x00000006