Import some basic libraries instances for Mde Packages.

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / CpuId.c

/** @file\r
  AsmCpuid function.\r
\r
  Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
//\r
// Include common header file for this module.\r
//\r
#include "CommonHeader.h"\r
\r
UINT32\r
EFIAPI\r
AsmCpuid (\r
  IN      UINT32                    Index,\r
  OUT     UINT32                    *RegisterEax,  OPTIONAL\r
  OUT     UINT32                    *RegisterEbx,  OPTIONAL\r
  OUT     UINT32                    *RegisterEcx,  OPTIONAL\r
  OUT     UINT32                    *RegisterEdx   OPTIONAL\r
  )\r
{\r
  _asm {\r
    mov     eax, Index\r
    cpuid\r
    push    ecx\r
    mov     ecx, RegisterEax\r
    jecxz   SkipEax\r
    mov     [ecx], eax\r
SkipEax:\r
    mov     ecx, RegisterEbx\r
    jecxz   SkipEbx\r
    mov     [ecx], ebx\r
SkipEbx:\r
    pop     eax\r
    mov     ecx, RegisterEcx\r
    jecxz   SkipEcx\r
    mov     [ecx], eax\r
SkipEcx:\r
    mov     ecx, RegisterEdx\r
    jecxz   SkipEdx\r
    mov     [ecx], edx\r
SkipEdx:\r
    mov     eax, Index\r
  }\r
}\r
\r