MdePkg/Library/BaseLib/Ia32/CpuId.s

   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
  25
  26
  27 #------------------------------------------------------------------------------
  28 #  VOID
  29 #  EFIAPI
  30 #  AsmCpuid (
  31 #    IN   UINT32  RegisterInEax,
  32 #    OUT  UINT32  *RegisterOutEax  OPTIONAL,
  33 #    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
  34 #    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
  35 #    OUT  UINT32  *RegisterOutEdx  OPTIONAL
  36 #    )
  37 #------------------------------------------------------------------------------
  38 .globl _AsmCpuid
  39 _AsmCpuid:
  40     push   %ebx
  41     push   %edi
  42     movl    12(%esp),%eax
  43     cpuid
  44     movl    %ecx,%edi
  45     movl    16(%esp),%ecx
  46     jecxz   L1
  47     movl    %eax,(%ecx)
  48 L1:
  49     movl    20(%esp),%ecx
  50     jecxz   L2
  51     movl    %ebx,(%ecx)
  52 L2:
  53     movl    24(%esp),%ecx
  54     jecxz   L3
  55     movl    %edi,(%ecx)
  56 L3:
  57     movl    28(%esp),%ecx
  58     jecxz   L4
  59     movl    %edx,(%ecx)
  60 L4:
  61     pop    %edi
  62     pop    %ebx
  63     ret