DuetPkg/DxeIpl/Ia32/CpuIoAccess.asm

   1   title   CpuIoAccess.asm
   2 ;------------------------------------------------------------------------------
   3 ;
   4 ; Copyright (c) 2006, 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   .686
  22   .MODEL FLAT,C
  23   .CODE
  24
  25
  26 UINT8    TYPEDEF    BYTE
  27 UINT16   TYPEDEF    WORD
  28 UINT32   TYPEDEF    DWORD
  29 UINT64   TYPEDEF    QWORD
  30 UINTN    TYPEDEF    UINT32
  31
  32
  33
  34 ;------------------------------------------------------------------------------
  35 ;  UINT8
  36 ;  CpuIoRead8 (
  37 ;    IN  UINT16  Port
  38 ;    )
  39 ;------------------------------------------------------------------------------
  40 CpuIoRead8 PROC  PUBLIC Port:UINT16
  41     mov    dx,  Port
  42     in     al,  dx
  43     ret
  44 CpuIoRead8  ENDP
  45
  46
  47 ;------------------------------------------------------------------------------
  48 ;  VOID
  49 ;  CpuIoWrite8 (
  50 ;    IN  UINT16  Port,
  51 ;    IN  UINT32  Data
  52 ;    )
  53 ;------------------------------------------------------------------------------
  54 CpuIoWrite8 PROC    PUBLIC Port:UINT16, Data:UINT32
  55     mov    eax, Data
  56     mov    dx,  Port
  57     out    dx,  al
  58     ret
  59 CpuIoWrite8  ENDP
  60
  61
  62 END