MdePkg/Library/BaseLib/Ia32/CpuId.S

   1 //
   2 // Include common header file for this module.
   3 //
   4 #include "CommonHeader.h"
   5
   6 #------------------------------------------------------------------------------
   7 #
   8 # Copyright (c) 2006, Intel Corporation
   9 # All rights reserved. This program and the accompanying materials
  10 # are licensed and made available under the terms and conditions of the BSD License
  11 # which accompanies this distribution.  The full text of the license may be found at
  12 # http://opensource.org/licenses/bsd-license.php
  13 #
  14 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  15 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  16 #
  17 # Module Name:
  18 #
  19 #   CpuId.Asm
  20 #
  21 # Abstract:
  22 #
  23 #   AsmCpuid function
  24 #
  25 # Notes:
  26 #
  27 #------------------------------------------------------------------------------
  28
  29 .globl  ASM_PFX(AsmCpuid)
  30
  31 #------------------------------------------------------------------------------
  32 #  VOID
  33 #  EFIAPI
  34 #  AsmCpuid (
  35 #    IN   UINT32  RegisterInEax,
  36 #    OUT  UINT32  *RegisterOutEax  OPTIONAL,
  37 #    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
  38 #    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
  39 #    OUT  UINT32  *RegisterOutEdx  OPTIONAL
  40 #    )
  41 #------------------------------------------------------------------------------
  42 ASM_PFX(AsmCpuid):
  43     push    %ebx
  44     push    %ebp
  45     movl    %esp, %ebp
  46     movl    12(%ebp), %eax
  47     cpuid
  48     push    %ecx
  49     movl    16(%ebp), %ecx
  50     jecxz   L1
  51     movl    %eax, (%ecx)
  52 L1:
  53     movl    20(%ebp), %ecx
  54     jecxz   L2
  55     movl    %ebx, (%ecx)
  56 L2:
  57     movl    24(%ebp), %ecx
  58     jecxz   L3
  59     popl    (%ecx)
  60 L3:
  61     movl    28(%ebp), %ecx
  62     jecxz   L4
  63     movl    %edx, (%ecx)
  64 L4:
  65     movl    12(%ebp), %eax
  66     leave
  67     pop     %ebx
  68     ret