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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
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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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53
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 #* All rights reserved. This program and the accompanying materials
#* are licensed and made available under the terms and conditions of the BSD License #* 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 #* which accompanies this distribution. The full text of the license may be found at
@ -12,34 +12,30 @@
#* #*
#------------------------------------------------------------------------------ #------------------------------------------------------------------------------
#
# 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. # Initializes floating point units for requirement of UEFI specification.
# #
# This function initializes floating-point control word to 0x027F (all exceptions # This function initializes floating-point control word to 0x027F (all exceptions
# masked,double-precision, round-to-nearest) and multimedia-extensions control word # masked,double-precision, round-to-nearest) and multimedia-extensions control word
# (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to zero # (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to zero
# for masked underflow). # for masked underflow).
# #
ASM_GLOBAL ASM_PFX(InitializeFloatingPointUnits) ASM_GLOBAL ASM_PFX(InitializeFloatingPointUnits)
ASM_PFX(InitializeFloatingPointUnits): ASM_PFX(InitializeFloatingPointUnits):
# #
# Initialize floating point units # Initialize floating point units
# #
finit 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 # Set OSFXSR bit 9 in CR4
@ -47,8 +43,15 @@ ASM_PFX(InitializeFloatingPointUnits):
movq %cr4, %rax movq %cr4, %rax
or $200, %rax or $200, %rax
movq %rax, %cr4 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 ret