MdePkg/Library/BaseLib/X64/CpuIdEx.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006 - 2008, 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 ;   CpuIdEx.Asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   AsmCpuidEx function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     DEFAULT REL
  25     SECTION .text
  26
  27 ;------------------------------------------------------------------------------
  28 ;  UINT32
  29 ;  EFIAPI
  30 ;  AsmCpuidEx (
  31 ;    IN   UINT32  RegisterInEax,
  32 ;    IN   UINT32  RegisterInEcx,
  33 ;    OUT  UINT32  *RegisterOutEax  OPTIONAL,
  34 ;    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
  35 ;    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
  36 ;    OUT  UINT32  *RegisterOutEdx  OPTIONAL
  37 ;    )
  38 ;------------------------------------------------------------------------------
  39 global ASM_PFX(AsmCpuidEx)
  40 ASM_PFX(AsmCpuidEx):
  41     push    rbx
  42     mov     eax, ecx
  43     mov     ecx, edx
  44     push    rax                         ; save Index on stack
  45     cpuid
  46     mov     r10, [rsp + 0x38]
  47     test    r10, r10
  48     jz      .0
  49     mov     [r10], ecx
  50 .0:
  51     mov     rcx, r8
  52     jrcxz   .1
  53     mov     [rcx], eax
  54 .1:
  55     mov     rcx, r9
  56     jrcxz   .2
  57     mov     [rcx], ebx
  58 .2:
  59     mov     rcx, [rsp + 0x40]
  60     jrcxz   .3
  61     mov     [rcx], edx
  62 .3:
  63     pop     rax                         ; restore Index to rax as return value
  64     pop     rbx
  65     ret
  66