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Diffstat (limited to 'UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm')
-rw-r--r--UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm2
1 files changed, 1 insertions, 1 deletions
diff --git a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
index f8f471233e..34c07a6d51 100644
--- a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
+++ b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
@@ -266,8 +266,8 @@ MwaitLoop:
xor ecx, ecx ; ecx = 0
xor edx, edx ; edx = 0
monitor
- shl ebx, 4
mov eax, ebx ; Mwait Cx, Target C-State per eax[7:4]
+ shl eax, 4
mwait
jmp MwaitLoop
HltLoop: