MdePkg/Library/BaseLib/Ia32/CpuId.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   4 ; 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     SECTION .text
  25
  26 ;------------------------------------------------------------------------------
  27 ;  VOID
  28 ;  EFIAPI
  29 ;  AsmCpuid (
  30 ;    IN   UINT32  RegisterInEax,
  31 ;    OUT  UINT32  *RegisterOutEax  OPTIONAL,
  32 ;    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
  33 ;    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
  34 ;    OUT  UINT32  *RegisterOutEdx  OPTIONAL
  35 ;    );
  36 ;------------------------------------------------------------------------------
  37 global ASM_PFX(AsmCpuid)
  38 ASM_PFX(AsmCpuid):
  39     push    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   .0
  47     mov     [ecx], eax
  48 .0:
  49     mov     ecx, [ebp + 20]
  50     jecxz   .1
  51     mov     [ecx], ebx
  52 .1:
  53     mov     ecx, [ebp + 24]
  54     jecxz   .2
  55     pop     DWORD [ecx]
  56 .2:
  57     mov     ecx, [ebp + 28]
  58     jecxz   .3
  59     mov     [ecx], edx
  60 .3:
  61     mov     eax, [ebp + 12]
  62     leave
  63     pop     ebx
  64     ret
  65