DuetPkg/CpuIoDxe/X64/CpuIoAccess.asm

   1   title   CpuIoAccess.asm
   2
   3 ;------------------------------------------------------------------------------
   4 ;*
   5 ;*   Copyright (c) 2005 - 2007, Intel Corporation
   6 ;*   All rights reserved. This program and the accompanying materials
   7 ;*   are licensed and made available under the terms and conditions of the BSD License
   8 ;*   which accompanies this distribution.  The full text of the license may be found at
   9 ;*   http://opensource.org/licenses/bsd-license.php
  10 ;*
  11 ;*   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 ;*   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13 ;*
  14 ;*   Module Name:
  15 ;*    CpuIoAccess.asm
  16 ;*
  17 ;*   Abstract:
  18 ;*    Supports x64 CPU IO operation
  19 ;*
  20 ;------------------------------------------------------------------------------
  21 ;
  22 ;
  23 ;
  24 ; Abstract:
  25 ;
  26 ;
  27 ;------------------------------------------------------------------------------
  28
  29 .CODE
  30
  31 ;------------------------------------------------------------------------------
  32 ;  UINT8
  33 ;  CpuIoRead8 (
  34 ;    UINT16  Port   // rcx
  35 ;    )
  36 ;------------------------------------------------------------------------------
  37 CpuIoRead8 PROC        PUBLIC
  38     xor   eax, eax
  39     mov    dx, cx
  40     in     al, dx
  41     ret
  42 CpuIoRead8  ENDP
  43
  44 ;------------------------------------------------------------------------------
  45 ;  VOID
  46 ;  CpuIoWrite8 (
  47 ;    UINT16  Port,    // rcx
  48 ;    UINT32  Data     // rdx
  49 ;    )
  50 ;------------------------------------------------------------------------------
  51 CpuIoWrite8 PROC        PUBLIC
  52     mov   eax, edx
  53     mov    dx, cx
  54     out    dx, al
  55     ret
  56 CpuIoWrite8  ENDP
  57
  58 ;------------------------------------------------------------------------------
  59 ;  UINT16
  60 ;  CpuIoRead16 (
  61 ;    UINT16  Port   // rcx
  62 ;    )
  63 ;------------------------------------------------------------------------------
  64 CpuIoRead16 PROC        PUBLIC
  65     xor   eax, eax
  66     mov    dx, cx
  67     in     ax, dx
  68     ret
  69 CpuIoRead16  ENDP
  70
  71 ;------------------------------------------------------------------------------
  72 ;  VOID
  73 ;  CpuIoWrite16 (
  74 ;    UINT16  Port,    // rcx
  75 ;    UINT32  Data     // rdx
  76 ;    )
  77 ;------------------------------------------------------------------------------
  78 CpuIoWrite16 PROC        PUBLIC
  79     mov   eax, edx
  80     mov    dx, cx
  81     out    dx, ax
  82     ret
  83 CpuIoWrite16  ENDP
  84
  85 ;------------------------------------------------------------------------------
  86 ;  UINT32
  87 ;  CpuIoRead32 (
  88 ;    UINT16  Port   // rcx
  89 ;    )
  90 ;------------------------------------------------------------------------------
  91 CpuIoRead32 PROC        PUBLIC
  92     mov    dx, cx
  93     in    eax, dx
  94     ret
  95 CpuIoRead32  ENDP
  96
  97 ;------------------------------------------------------------------------------
  98 ;  VOID
  99 ;  CpuIoWrite32 (
 100 ;    UINT16  Port,    // rcx
 101 ;    UINT32  Data     // rdx
 102 ;    )
 103 ;------------------------------------------------------------------------------
 104 CpuIoWrite32 PROC        PUBLIC
 105     mov   eax, edx
 106     mov    dx, cx
 107     out    dx, eax
 108     ret
 109 CpuIoWrite32  ENDP
 110
 111 END