diff options
| author | Warner Losh <imp@FreeBSD.org> | 2017-03-07 20:53:26 +0000 |
|---|---|---|
| committer | Warner Losh <imp@FreeBSD.org> | 2017-03-07 20:53:26 +0000 |
| commit | 0499b37cea9ca98acfe36368e521ad36b7783f2d (patch) | |
| tree | 7968fdc8d6edf3e051bbd434a466eca88aacf938 /MdePkg/Library/BaseLib/X64/EnableCache.S | |
Notes
Diffstat (limited to 'MdePkg/Library/BaseLib/X64/EnableCache.S')
| -rw-r--r-- | MdePkg/Library/BaseLib/X64/EnableCache.S | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/X64/EnableCache.S b/MdePkg/Library/BaseLib/X64/EnableCache.S new file mode 100644 index 0000000000000..fe2bb1089e473 --- /dev/null +++ b/MdePkg/Library/BaseLib/X64/EnableCache.S @@ -0,0 +1,39 @@ +#------------------------------------------------------------------------------ +# +# Copyright (c) 2006 - 2008, 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. +# +# 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 +# ); +#------------------------------------------------------------------------------ +ASM_GLOBAL ASM_PFX(AsmEnableCache) +ASM_PFX(AsmEnableCache): + wbinvd + movq %cr0, %rax + btrq $30, %rax + btrq $29, %rax + movq %rax, %cr0 + ret |