Introduce UefiCpuLib library class in UefiCpuPkg and add one instance of BaseUefiCpuLib. The major purpose of this library class / instance is to provide some routines that are generic for IA32 family CPU

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9480 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
qhuang8
2009-11-25 04:25:02 +00:00
parent 77882e266e
commit 989322c384
8 changed files with 346 additions and 1 deletions

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#------------------------------------------------------------------------------
#*
#* Copyright 2009, 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
#* http://opensource.org/licenses/bsd-license.php
#*
#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#*
#*
#------------------------------------------------------------------------------
#
# 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.
#
# This function initializes floating-point control word to 0x027F (all exceptions
# masked,double-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).
#
ASM_GLOBAL ASM_PFX(InitializeFloatingPointUnits)
ASM_PFX(InitializeFloatingPointUnits):
#
# Initialize floating point units
#
finit
fldcw ASM_PFX(mFpuControlWord)
#
# Set OSFXSR bit 9 in CR4
#
movq %cr4, %rax
or $200, %rax
movq %rax, %cr4
ldmxcsr ASM_PFX(mMmxControlWord)
ret

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;------------------------------------------------------------------------------
;*
;* Copyright 2009, 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
;* http://opensource.org/licenses/bsd-license.php
;*
;* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
;* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;*
;*
;------------------------------------------------------------------------------
.const
;
; Float control word initial value:
; all exceptions masked, double-precision, round-to-nearest
;
mFpuControlWord DW 027Fh
;
; Multimedia-extensions control word:
; all exceptions masked, round-to-nearest, flush to zero for masked underflow
;
mMmxControlWord DD 01F80h
.code
;
; 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
; (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to zero
; for masked underflow).
;
InitializeFloatingPointUnits PROC PUBLIC
;
; Initialize floating point units
;
finit
fldcw mFpuControlWord
;
; Set OSFXSR bit 9 in CR4
;
mov rax, cr4
or rax, BIT9
mov cr4, rax
ldmxcsr mMmxControlWord
ret
InitializeFloatingPointUnits ENDP
END