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 #  VOID
  27 #  EFIAPI
  28 #  AsmCpuid (
  29 #    IN   UINT32  RegisterInEax,
  30 #    OUT  UINT32  *RegisterOutEax  OPTIONAL,
  31 #    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
  32 #    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
  33 #    OUT  UINT32  *RegisterOutEdx  OPTIONAL
  34 #    )
  35 #------------------------------------------------------------------------------
  36 .globl  _AsmCpuid
  37 _AsmCpuid:
  38     pushl   %ebx
  39     pushl   %ebp
  40     movl    %esp, %ebp
  41     movl    12(%ebp), %eax
  42     cpuid
  43     pushl   %ecx
  44     movl    16(%ebp), %ecx
  45     jecxz   L1
  46     movl    %eax, (%ecx)
  47 L1:
  48     movl    20(%ebp), %ecx
  49     jecxz   L2
  50     movl    %ebx, (%ecx)
  51 L2:
  52     movl    24(%ebp), %ecx
  53     jecxz   L3
  54     popl    (%ecx)
  55 L3:
  56     movl    28(%ebp), %ecx
  57     jecxz   L4
  58     movl    %edx, (%ecx)
  59 L4:
  60     movl    12(%ebp), %eax
  61     leave
  62     popl    %ebx
  63     ret
  64
  65