From 829633e3a82dee6f7f2541a0193331f6b8566dec Mon Sep 17 00:00:00 2001 From: Peicong Li Date: Tue, 7 Nov 2017 20:56:51 +0800 Subject: [PATCH] ArmPkg/ArmMmuLib: Add new attribute WRITE_BACK_NONSHAREABLE Flash region needs to be set as cacheable (write back) to increase performance, if PEI is still XIP on flash or DXE FV is decompressed from flash FV. However some ARM platforms do not support to set flash as inner shareable since flash is not normal DDR memory and it will not respond to cache snoop request, which will causes system hang after MMU is enabled. So we need a new ARM memory region attribute WRITE_BACK_NONSHAREABLE for flash region on these platforms specifically. This attribute will set the region as write back but not inner shared. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Peicong Li Signed-off-by: Heyi Guo Reviewed-by: Ard Biesheuvel Reviewed-by: Leif Lindholm --- ArmPkg/Include/Library/ArmLib.h | 8 ++++++++ ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c | 4 ++++ 2 files changed, 12 insertions(+) diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h index 24ffe9f1aa..24e84c7a19 100644 --- a/ArmPkg/Include/Library/ArmLib.h +++ b/ArmPkg/Include/Library/ArmLib.h @@ -41,6 +41,14 @@ typedef enum { ARM_MEMORY_REGION_ATTRIBUTE_NONSECURE_UNCACHED_UNBUFFERED, ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK, ARM_MEMORY_REGION_ATTRIBUTE_NONSECURE_WRITE_BACK, + + // On some platforms, memory mapped flash region is designed as not supporting + // shareable attribute, so WRITE_BACK_NONSHAREABLE is added for such special + // need. + // Do NOT use below two attributes if you are not sure. + ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK_NONSHAREABLE, + ARM_MEMORY_REGION_ATTRIBUTE_NONSECURE_WRITE_BACK_NONSHAREABLE, + ARM_MEMORY_REGION_ATTRIBUTE_WRITE_THROUGH, ARM_MEMORY_REGION_ATTRIBUTE_NONSECURE_WRITE_THROUGH, ARM_MEMORY_REGION_ATTRIBUTE_DEVICE, diff --git a/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c b/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c index 8bd1c6fad9..4b62ecb6a4 100644 --- a/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c +++ b/ArmPkg/Library/ArmMmuLib/AArch64/ArmMmuLibCore.c @@ -35,6 +35,10 @@ ArmMemoryAttributeToPageAttribute ( ) { switch (Attributes) { + case ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK_NONSHAREABLE: + case ARM_MEMORY_REGION_ATTRIBUTE_NONSECURE_WRITE_BACK_NONSHAREABLE: + return TT_ATTR_INDX_MEMORY_WRITE_BACK; + case ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK: case ARM_MEMORY_REGION_ATTRIBUTE_NONSECURE_WRITE_BACK: return TT_ATTR_INDX_MEMORY_WRITE_BACK | TT_SH_INNER_SHAREABLE; -- 2.39.2