mirror of https://github.com/acidanthera/audk.git
44 lines
1.3 KiB
NASM
44 lines
1.3 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php.
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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; Module Name:
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;
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; DisableCache.Asm
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;
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; Abstract:
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;
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; Set the CD bit of CR0 to 1, clear the NW bit of CR0 to 0, and flush all caches with a
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; WBINVD instruction.
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;
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; Notes:
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;
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;------------------------------------------------------------------------------
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DEFAULT REL
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SECTION .text
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;------------------------------------------------------------------------------
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; VOID
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; EFIAPI
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; AsmDisableCache (
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; VOID
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(AsmDisableCache)
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ASM_PFX(AsmDisableCache):
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mov rax, cr0
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bts rax, 30
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btr rax, 29
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mov cr0, rax
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wbinvd
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ret
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