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40 lines
1.2 KiB
40 lines
1.2 KiB
4 years ago
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#------------------------------------------------------------------------------
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#
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# Copyright (c) 2006 - 2018, 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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# EnableCache.S
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#
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# Abstract:
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#
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# Flush all caches with a WBINVD instruction, clear the CD bit of CR0 to 0, and clear
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# the NW bit of CR0 to 0
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#
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# Notes:
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#
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#------------------------------------------------------------------------------
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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_GLOBAL ASM_PFX(AsmEnableCache)
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ASM_PFX(AsmEnableCache):
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wbinvd
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movq %cr0, %rax
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btrq $30, %rax
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btrq $29, %rax
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movq %rax, %cr0
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ret
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