EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/X64/CpuId.asm

   1 ; Copyright (c) 2004, Intel Corporation. All rights reserved.<BR>
   2 ; This program and the accompanying materials
   3 ; are licensed and made available under the terms and conditions of the BSD License
   4 ; which accompanies this distribution.  The full text of the license may be found at
   5 ; http://opensource.org/licenses/bsd-license.php
   6 ;
   7 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   8 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
   9 ;
  10 ; Module Name:
  11 ;
  12 ;   CpuId.Asm
  13 ;
  14 ; Abstract:
  15 ;
  16 ;   AsmCpuid function
  17 ;
  18 ; Notes:
  19 ;
  20 ;------------------------------------------------------------------------------
  21
  22     .code
  23
  24 ;------------------------------------------------------------------------------
  25 ;  VOID
  26 ;  EFIAPI
  27 ;  AsmCpuid (
  28 ;    IN   UINT32  RegisterInEax,
  29 ;    OUT  UINT32  *RegisterOutEax  OPTIONAL,
  30 ;    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
  31 ;    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
  32 ;    OUT  UINT32  *RegisterOutEdx  OPTIONAL
  33 ;    )
  34 ;------------------------------------------------------------------------------
  35 AsmCpuid    PROC    USES    rbx
  36     mov     eax, ecx
  37     push    rax                         ; save Index on stack
  38     push    rdx
  39     cpuid
  40     test    r9, r9
  41     jz      @F
  42     mov     [r9], ecx
  43 @@:
  44     pop     rcx
  45     jrcxz   @F
  46     mov     [rcx], eax
  47 @@:
  48     mov     rcx, r8
  49     jrcxz   @F
  50     mov     [rcx], ebx
  51 @@:
  52     mov     rcx, [rsp + 38h]
  53     jrcxz   @F
  54     mov     [rcx], edx
  55 @@:
  56     pop     rax                         ; restore Index to rax as return value
  57     ret
  58 AsmCpuid    ENDP
  59
  60     END