UefiCpuPkg: Use FINIT instead of hex values

https://bugzilla.tianocore.org/show_bug.cgi?id=560

Update X64 NASM file to match IA32 NASM file
and use FINIT instruction instead of hand
assembled hex values for the FINIT instruction.

Cc: Jeff Fan <jeff.fan@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>

diff --git a/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.nasm b/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.nasm
index 404c199b35925dc2513b545ced88c76be0446a19..d94a60f13e6f16991f6708c43b842099214cfdf1 100644 (file)
--- a/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.nasm
+++ b/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.nasm
@@ -41,10 +41,7 @@ ASM_PFX(InitializeFloatingPointUnits):
     ;\r
     ; Initialize floating point units\r
     ;\r
     ;\r
     ; Initialize floating point units\r
     ;\r

-    ; The following opcodes stand for instruction 'finit'\r
-    ; to be supported by some 64-bit assemblers\r
-    ;\r
-    DB      0x9B, 0xDB, 0xE3\r
+    finit\r

     fldcw   [mFpuControlWord]\r
 \r
     ;\r
     fldcw   [mFpuControlWord]\r
 \r
     ;\r