apps/include/ioport.h

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU Lesser General Public License as published by
   7     the Free Software Foundation, either version 3 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU Lesser General Public License for more details.
  14
  15     You should have received a copy of the GNU Lesser General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #ifndef _LIBMEINOS_IOPORT_H_
  20 #define _LIBMEINOS_IOPORT_H_
  21
  22 #include <stdint.h>
  23 #include <syscall.h>
  24 #include <errno.h>
  25
  26 static inline int ioport_reg(uint16_t port) {
  27   int ret = syscall_call(SYSCALL_IO_REG,1,port);
  28   errno = ret<0?-ret:0;
  29   return ret<0?-1:ret;
  30 }
  31
  32 static inline int ioport_unreg(uint16_t port) {
  33   int ret = syscall_call(SYSCALL_IO_UNREG,1,port);
  34   errno = ret<0?-ret:0;
  35   return ret<0?-1:ret;
  36 }
  37
  38 static inline uint8_t inb(uint16_t _port) {
  39   uint8_t _result;
  40   __asm__("inb %1, %0":"=a"(_result):"Nd"(_port));
  41   return _result;
  42 }
  43
  44 static inline uint16_t inw(uint16_t _port) {
  45   uint16_t _result;
  46   __asm__("inw %1, %0":"=a"(_result):"Nd"(_port));
  47   return _result;
  48 }
  49
  50 static inline uint32_t inl(uint16_t _port) {
  51   uint32_t _result;
  52   __asm__("inl %1, %0":"=a"(_result):"Nd"(_port));
  53   return _result;
  54 }
  55
  56 static inline void outw(uint16_t _port,uint16_t _data) {
  57   __asm__("outw %0, %1"::"a"(_data),"Nd"(_port));
  58 }
  59
  60 static inline void outb(uint16_t _port,uint8_t _data) {
  61   __asm__("outb %0, %1"::"a"(_data),"Nd"(_port));
  62 }
  63
  64 static inline void outl(uint16_t _port,uint32_t _data) {
  65   __asm__("outl %0, %1"::"a"(_data),"Nd" (_port));
  66 }
  67
  68 #endif
  69