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UefiCpuPkg BaseUefiCpuLib: Change the initialization value for x87 FPU Control Word for x64 arch from 0x27f to 0x37f per UEFI 2.3.1c spec. 

Signed-off-by: Sun Rui <rui.sun@intel.com>
Reviewed-by: Fan Jeff <jeff.fan@intel.com>


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13506 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
rsun3 2012-07-05 08:44:57 +00:00
parent 8f8ca22e59
commit e768377c22
2 changed files with 7 additions and 7 deletions
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8
UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.S
View File

@ -1,6 +1,6 @@
#------------------------------------------------------------------------------
#*
#* Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
#* 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
@ -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

6
UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.asm
View File

@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;*
;* Copyright (c) 2009, Intel Corporation. All rights reserved.<BR>
;* 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
@ -16,9 +16,9 @@
.const
;
; Float control word initial value:
; all exceptions masked, double-precision, round-to-nearest
; all exceptions masked, double-extended-precision, round-to-nearest
;
mFpuControlWord DW 027Fh
mFpuControlWord DW 037Fh
;
; Multimedia-extensions control word:
; all exceptions masked, round-to-nearest, flush to zero for masked underflow