MdePkg/Library/BaseLib/Ia32/CpuId.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation
   4 ; All rights reserved. This program and the accompanying materials
   5 ; are licensed and made available under the terms and conditions of the BSD License
   6 ; which accompanies this distribution.  The full text of the license may be found at
   7 ; http://opensource.org/licenses/bsd-license.php
   8 ;
   9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 ;
  12 ; Module Name:
  13 ;
  14 ;   CpuId.Asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   AsmCpuid function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     .586P
  25     .model  flat,C
  26     .code
  27
  28 ;------------------------------------------------------------------------------
  29 ;  VOID
  30 ;  EFIAPI
  31 ;  AsmCpuid (
  32 ;    IN   UINT32  RegisterInEax,
  33 ;    OUT  UINT32  *RegisterOutEax  OPTIONAL,
  34 ;    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
  35 ;    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
  36 ;    OUT  UINT32  *RegisterOutEdx  OPTIONAL
  37 ;    )
  38 ;------------------------------------------------------------------------------
  39 AsmCpuid    PROC    USES    ebx
  40     push    ebp
  41     mov     ebp, esp
  42     mov     eax, [ebp + 12]
  43     cpuid
  44     push    ecx
  45     mov     ecx, [ebp + 16]
  46     jecxz   @F
  47     mov     [ecx], eax
  48 @@:
  49     mov     ecx, [ebp + 20]
  50     jecxz   @F
  51     mov     [ecx], ebx
  52 @@:
  53     mov     ecx, [ebp + 24]
  54     jecxz   @F
  55     pop     [ecx]
  56 @@:
  57     mov     ecx, [ebp + 28]
  58     jecxz   @F
  59     mov     [ecx], edx
  60 @@:
  61     mov     eax, [ebp + 12]
  62     leave
  63     ret
  64 AsmCpuid    ENDP
  65
  66     END