audk/MdePkg/Library/BaseLib/Ia32/EnableCache.S

40 lines
1.2 KiB
ArmAsm

#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2008, 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.
#
# Module Name:
#
# EnableCache.S
#
# Abstract:
#
# Flush all caches with a WBINVD instruction, clear the CD bit of CR0 to 0, and clear
# the NW bit of CR0 to 0
#
# Notes:
#
#------------------------------------------------------------------------------
#------------------------------------------------------------------------------
# VOID
# EFIAPI
# AsmEnableCache (
# VOID
# );
#------------------------------------------------------------------------------
.globl ASM_PFX(AsmEnableCache)
ASM_PFX(AsmEnableCache):
wbinvd
movl %cr0, %eax
btrl $30, %eax
btrl $29, %eax
movl %eax, %cr0
ret