EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ia32/CpuId.S

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