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

UefiCpuPkg/MpInitLib: Add EnableExecuteDisable in MP_CPU_EXCHANGE_INFO

Browse Source 
EnableExecuteDisable in MP_CPU_EXCHANGE_INFO is used to tell AP reset vector if
enable execute disable feature on APs. This feature should be enabled before CR3
is written.

Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Michael Kinney <michael.d.kinney@intel.com>
This commit is contained in:
Jeff Fan
2016-07-29 21:13:34 +08:00
parent 8396e2dd30
commit 5c66d125ea
5 changed files with 49 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
View File

@@ -69,6 +69,19 @@ o32 lgdt [cs:si]
mov si, IdtrLocation
o32 lidt [cs:si]
mov si, EnableExecuteDisableLocation
cmp byte [si], 0
jz SkipEnableExecuteDisableBit
;
; Enable execute disable bit
;
mov ecx, 0c0000080h ; EFER MSR number
rdmsr ; Read EFER
bts eax, 11 ; Enable Execute Disable Bit
wrmsr ; Write EFER
SkipEnableExecuteDisableBit:
mov di, DataSegmentLocation
mov edi, [di] ; Save long mode DS in edi