mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-24 11:45:27 +01:00
58 lines
1.7 KiB
ArmAsm
58 lines
1.7 KiB
ArmAsm
#------------------------------------------------------------------------------
|
|
#*
|
|
#* Copyright (c) 2009 - 2010, 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
|
|
#*
|
|
#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
#*
|
|
#*
|
|
#------------------------------------------------------------------------------
|
|
|
|
#
|
|
# 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
|
|
|
|
#
|
|
# 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
|
|
#
|
|
movq %cr4, %rax
|
|
or $0x200, %rax
|
|
movq %rax, %cr4
|
|
|
|
#
|
|
# 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
|
|
|