23086ba84c
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1567 6f19259b-4bc3-4df7-8a09-765794883524
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/** @file
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AsmCpuid function.
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Copyright (c) 2006, Intel Corporation<BR>
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All rights reserved. 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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#if _MSC_EXTENSIONS
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UINT32
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EFIAPI
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AsmCpuid (
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IN UINT32 Index,
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OUT UINT32 *RegisterEax, OPTIONAL
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OUT UINT32 *RegisterEbx, OPTIONAL
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OUT UINT32 *RegisterEcx, OPTIONAL
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OUT UINT32 *RegisterEdx OPTIONAL
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)
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{
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_asm {
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mov eax, Index
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cpuid
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push ecx
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mov ecx, RegisterEax
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jecxz SkipEax
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mov [ecx], eax
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SkipEax:
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mov ecx, RegisterEbx
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jecxz SkipEbx
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mov [ecx], ebx
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SkipEbx:
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pop eax
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mov ecx, RegisterEcx
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jecxz SkipEcx
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mov [ecx], eax
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SkipEcx:
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mov ecx, RegisterEdx
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jecxz SkipEdx
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mov [ecx], edx
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SkipEdx:
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mov eax, Index
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}
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}
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#endif
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