UefiCpuPkg BaseUefiCpuLib: Change the initialization value for x87 FPU Control Word...

[mirror_edk2.git] / UefiCpuPkg / Library / BaseUefiCpuLib / X64 / InitializeFpu.S

diff --git a/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.S b/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.S
index bf8d1c13e46cc650b71a6a7515289c4fa9816075..9c51772adcb0213e2623cb1d6c6f8d3fea2b87bf 100644 (file)
--- a/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.S
+++ b/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.S
@@ -1,7 +1,7 @@
 #------------------------------------------------------------------------------
 #*
-#*   Copyright 2009 - 2010, Intel Corporation
-#*   All rights reserved. This program and the accompanying materials
+#*   Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>
+#*   This program and the accompanying materials
 #*   are licensed and made available under the terms and conditions of the BSD License
 #*   which accompanies this distribution.  The full text of the license may be found at
 #*   http://opensource.org/licenses/bsd-license.php
@@ -15,8 +15,8 @@
 #
 # Initializes floating point units for requirement of UEFI specification.
 #
-# This function initializes floating-point control word to 0x027F (all exceptions
-# masked,double-precision, round-to-nearest) and multimedia-extensions control word
+# This function initializes floating-point control word to 0x037F (all exceptions
+# masked,double-extended-precision, round-to-nearest) and multimedia-extensions control word
 # (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to zero
 # for masked underflow).
 #
@@ -32,7 +32,7 @@ ASM_PFX(InitializeFloatingPointUnits):
     # Float control word initial value: 
     # all exceptions masked, double-precision, round-to-nearest
     #
-    pushq   $0x027F
+    pushq   $0x037F
     lea     (%rsp), %rax 
     fldcw   (%rax)
     popq    %rax
@@ -41,7 +41,7 @@ ASM_PFX(InitializeFloatingPointUnits):
     # Set OSFXSR bit 9 in CR4
     #
     movq    %cr4, %rax 
-    or      $200, %rax
+    or      $0x200, %rax
     movq    %rax, %cr4
 
     #