sravan/system76-edk2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ArmPkg/ArmMmuLib ARM: Isolate the access flag from AP mask

Browse Source 
Split the ARM permission fields in the short descriptors into an access
flag and AP[2:1] as per the recommendation in the ARM ARM. This makes
the access flag available separately, which allows us to implement
EFI_MEMORY_RP memory analogous to how it will be implemented for
AArch64.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com>
This commit is contained in:
Ard Biesheuvel
2023-02-07 17:32:19 +01:00
committed by mergify[bot]
parent 699372d388
commit 28dce5b130
5 changed files with 63 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
ArmPkg/Library/ArmLib/Arm/ArmV7Support.S
View File

@@ -16,6 +16,7 @@
.set CTRL_C_BIT, (1 << 2)
.set CTRL_B_BIT, (1 << 7)
.set CTRL_I_BIT, (1 << 12)
.set CTRL_AFE_BIT,(1 << 29)
ASM_FUNC(ArmInvalidateDataCacheEntryByMVA)
@@ -64,6 +65,7 @@ ASM_FUNC(ArmInvalidateInstructionCache)
ASM_FUNC(ArmEnableMmu)
mrc p15,0,R0,c1,c0,0
orr R0,R0,#1
orr R0,R0,#CTRL_AFE_BIT
mcr p15,0,R0,c1,c0,0
dsb
isb