MdePkg/Library/BaseLib/X64/CpuIdEx.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;   CpuIdEx.Asm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   AsmCpuidEx function
  13 ;
  14 ; Notes:
  15 ;
  16 ;------------------------------------------------------------------------------
  17
  18     DEFAULT REL
  19     SECTION .text
  20
  21 ;------------------------------------------------------------------------------
  22 ;  UINT32
  23 ;  EFIAPI
  24 ;  AsmCpuidEx (
  25 ;    IN   UINT32  RegisterInEax,
  26 ;    IN   UINT32  RegisterInEcx,
  27 ;    OUT  UINT32  *RegisterOutEax  OPTIONAL,
  28 ;    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
  29 ;    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
  30 ;    OUT  UINT32  *RegisterOutEdx  OPTIONAL
  31 ;    )
  32 ;------------------------------------------------------------------------------
  33 global ASM_PFX(AsmCpuidEx)
  34 ASM_PFX(AsmCpuidEx):
  35     push    rbx
  36     mov     eax, ecx
  37     mov     ecx, edx
  38     push    rax                         ; save Index on stack
  39     cpuid
  40     mov     r10, [rsp + 0x38]
  41     test    r10, r10
  42     jz      .0
  43     mov     [r10], ecx
  44 .0:
  45     mov     rcx, r8
  46     jrcxz   .1
  47     mov     [rcx], eax
  48 .1:
  49     mov     rcx, r9
  50     jrcxz   .2
  51     mov     [rcx], ebx
  52 .2:
  53     mov     rcx, [rsp + 0x40]
  54     jrcxz   .3
  55     mov     [rcx], edx
  56 .3:
  57     pop     rax                         ; restore Index to rax as return value
  58     pop     rbx
  59     ret
  60