MdePkg/Library/BaseLib/Ia32/CpuId.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;   CpuId.Asm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   AsmCpuid function
  13 ;
  14 ; Notes:
  15 ;
  16 ;------------------------------------------------------------------------------
  17
  18     SECTION .text
  19
  20 ;------------------------------------------------------------------------------
  21 ;  VOID
  22 ;  EFIAPI
  23 ;  AsmCpuid (
  24 ;    IN   UINT32  RegisterInEax,
  25 ;    OUT  UINT32  *RegisterOutEax  OPTIONAL,
  26 ;    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
  27 ;    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
  28 ;    OUT  UINT32  *RegisterOutEdx  OPTIONAL
  29 ;    );
  30 ;------------------------------------------------------------------------------
  31 global ASM_PFX(AsmCpuid)
  32 ASM_PFX(AsmCpuid):
  33     push    ebx
  34     push    ebp
  35     mov     ebp, esp
  36     mov     eax, [ebp + 12]
  37     cpuid
  38     push    ecx
  39     mov     ecx, [ebp + 16]
  40     jecxz   .0
  41     mov     [ecx], eax
  42 .0:
  43     mov     ecx, [ebp + 20]
  44     jecxz   .1
  45     mov     [ecx], ebx
  46 .1:
  47     mov     ecx, [ebp + 24]
  48     jecxz   .2
  49     pop     DWORD [ecx]
  50 .2:
  51     mov     ecx, [ebp + 28]
  52     jecxz   .3
  53     mov     [ecx], edx
  54 .3:
  55     mov     eax, [ebp + 12]
  56     leave
  57     pop     ebx
  58     ret
  59