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Removed use of pre-initialized global data in this file as it was causing problems with UNIXGCC tool chain.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9699 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
geekboy15a 2010-01-08 21:29:30 +00:00
parent bbd8fad2b8
commit 3d49c108a0
1 changed files with 28 additions and 25 deletions
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33
UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.S
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@ -1,6 +1,6 @@
#------------------------------------------------------------------------------
#*
#* Copyright 2009, Intel Corporation
#* Copyright 2009 - 2010, Intel Corporation
#* All rights reserved. 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
@ -12,18 +12,6 @@
#*
#------------------------------------------------------------------------------
#
# Float control word initial value:
# all exceptions masked, double-precision, round-to-nearest
#
ASM_PFX(mFpuControlWord): .word 0x027F
#
# Multimedia-extensions control word:
# all exceptions masked, round-to-nearest, flush to zero for masked underflow
#
ASM_PFX(mMmxControlWord): .long 0x01F80
#
# Initializes floating point units for requirement of UEFI specification.
#
@ -39,7 +27,15 @@ ASM_PFX(InitializeFloatingPointUnits):
# Initialize floating point units
#
finit
fldcw ASM_PFX(mFpuControlWord)
#
# Float control word initial value:
# all exceptions masked, double-precision, round-to-nearest
#
pushq $0x027F
lea (%rsp), %rax
fldcw (%rax)
popq %rax
#
# Set OSFXSR bit 9 in CR4
@ -48,7 +44,14 @@ ASM_PFX(InitializeFloatingPointUnits):
or $200, %rax
movq %rax, %cr4
ldmxcsr ASM_PFX(mMmxControlWord)
#
# Multimedia-extensions control word:
# all exceptions masked, round-to-nearest, flush to zero for masked underflow
#
pushq $0x01F80
lea (%rsp), %rax
ldmxcsr (%rax)
popq %rax
ret