DuetPkg/DxeIpl/X64/CpuIoAccess.asm

   1   title   CpuIoAccess.asm
   2 ;------------------------------------------------------------------------------
   3 ;
   4 ; Copyright (c) 2006 - 2007, Intel Corporation
   5 ; All rights reserved. This program and the accompanying materials
   6 ; are licensed and made available under the terms and conditions of the BSD License
   7 ; which accompanies this distribution.  The full text of the license may be found at
   8 ; http://opensource.org/licenses/bsd-license.php
   9 ;
  10 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 ;
  13 ; Module Name:
  14 ;   CpuIoAccess.asm
  15 ;
  16 ; Abstract:
  17 ;   CPU IO Abstraction
  18 ;
  19 ;------------------------------------------------------------------------------
  20
  21
  22 .code
  23
  24 ;------------------------------------------------------------------------------
  25 ;  UINT8
  26 ;  CpuIoRead8 (
  27 ;    UINT16  Port   // rcx
  28 ;    )
  29 ;------------------------------------------------------------------------------
  30 CpuIoRead8 PROC        PUBLIC
  31     xor   eax, eax
  32     mov    dx, cx
  33     in     al, dx
  34     ret
  35 CpuIoRead8  ENDP
  36
  37 ;------------------------------------------------------------------------------
  38 ;  VOID
  39 ;  CpuIoWrite8 (
  40 ;    UINT16  Port,    // rcx
  41 ;    UINT32  Data     // rdx
  42 ;    )
  43 ;------------------------------------------------------------------------------
  44 CpuIoWrite8 PROC        PUBLIC
  45           mov   eax, edx
  46     mov    dx, cx
  47     out    dx, al
  48     ret
  49 CpuIoWrite8  ENDP
  50
  51
  52 END