ArmPkg/CpuDxe: ignore attribute changes during SyncCacheConfig()
To prevent the initial MMU->GCD memory space map synchronization from stripping permissions attributes [which we cannot use in the GCD memory space map, unfortunately], implement the same approach as x86, and ignore SetMemoryAttributes() calls during the time SyncCacheConfig() is in progress. This is a horrible hack, but is currently the only way we can implement strict permissions on arbitrary memory regions [as opposed to PE/COFF text/data sections only] Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
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@@ -17,6 +17,7 @@
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#include <Guid/IdleLoopEvent.h>
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BOOLEAN mIsFlushingGCD;
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/**
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This function flushes the range of addresses from Start to Start+Length
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@@ -261,7 +262,9 @@ CpuDxeInitialize (
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// and that calls EFI_CPU_ARCH_PROTOCOL.SetMemoryAttributes, so this code needs to go
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// after the protocol is installed
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//
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mIsFlushingGCD = TRUE;
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SyncCacheConfig (&mCpu);
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mIsFlushingGCD = FALSE;
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// If the platform is a MPCore system then install the Configuration Table describing the
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// secondary core states
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