mirror of https://github.com/acidanthera/audk.git
63 lines
1.7 KiB
NASM
63 lines
1.7 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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; CpuId.Asm
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;
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; Abstract:
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;
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; AsmCpuid function
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;
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; Notes:
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;
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;------------------------------------------------------------------------------
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.code
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;------------------------------------------------------------------------------
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; VOID
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; EFIAPI
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; AsmCpuid (
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; IN UINT32 RegisterInEax,
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; OUT UINT32 *RegisterOutEax OPTIONAL,
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; OUT UINT32 *RegisterOutEbx OPTIONAL,
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; OUT UINT32 *RegisterOutEcx OPTIONAL,
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; OUT UINT32 *RegisterOutEdx OPTIONAL
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; )
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;------------------------------------------------------------------------------
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AsmCpuid PROC USES rbx
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mov eax, ecx
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push rax ; save Index on stack
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push rdx
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cpuid
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test r9, r9
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jz @F
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mov [r9], ecx
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@@:
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pop rcx
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jrcxz @F
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mov [rcx], eax
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@@:
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mov rcx, r8
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jrcxz @F
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mov [rcx], ebx
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@@:
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mov rcx, [rsp + 38h]
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jrcxz @F
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mov [rcx], edx
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@@:
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pop rax ; restore Index to rax as return value
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ret
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AsmCpuid ENDP
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END
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