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ArmPkg/ArmV7Mmu: prefer non shareable memory on non-coherent hardware

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Commit SVN r18778 made all mappings of normal memory (inner) shareable,
even on hardware that implements shareability as uncached accesses.
The original concerns that prompted the change, regarding coherent DMA
and virt guests migrating between CPUs, do not apply to such hardware,
so revert to the original behavior in that case.

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@19285 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ard Biesheuvel
2015-12-15 17:31:56 +00:00
committed by abiesheuvel
parent b9f7890c47
commit 46ff196fde
2 changed files with 53 additions and 3 deletions
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14
ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.h
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@@ -15,6 +15,20 @@
#ifndef __ARM_V7_LIB_H__
#define __ARM_V7_LIB_H__
#define ID_MMFR0_SHARELVL_SHIFT 12
#define ID_MMFR0_SHARELVL_MASK 0xf
#define ID_MMFR0_SHARELVL_ONE 0
#define ID_MMFR0_SHARELVL_TWO 1
#define ID_MMFR0_INNERSHR_SHIFT 28
#define ID_MMFR0_INNERSHR_MASK 0xf
#define ID_MMFR0_OUTERSHR_SHIFT 8
#define ID_MMFR0_OUTERSHR_MASK 0xf
#define ID_MMFR0_SHR_IMP_UNCACHED 0
#define ID_MMFR0_SHR_IMP_HW_COHERENT 1
#define ID_MMFR0_SHR_IGNORED 0xf
typedef VOID (*ARM_V7_CACHE_OPERATION)(UINT32);
VOID