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37 lines
916 B
37 lines
916 B
/** @file
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AsmEnableCache function
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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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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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/**
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Perform a WBINVD and clear both the CD and NW bits of CR0.
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Enables the caches by executing a WBINVD instruction and then clear both the CD and NW
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bits of CR0 to 0. This function is only available on IA-32 and x64.
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**/
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VOID
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EFIAPI
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AsmEnableCache (
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VOID
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)
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{
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_asm {
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wbinvd
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mov eax, cr0
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btr eax, 30
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btr eax, 29
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mov cr0, eax
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}
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}
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