minix: lib/syslib/sys_in.c Source File

00001 #include "syslib.h"
00002 
00003 /*===========================================================================*
00004  *                                sys_in                                     *
00005  *===========================================================================*/
00006 PUBLIC int sys_in(port, value, type)
00007 int port;                               /* port address to read from */
00008 unsigned long *value;                   /* pointer where to store value */
00009 int type;                               /* byte, word, long */
00010 {
00011     message m_io;
00012     int result;
00013 
00014     m_io.DIO_TYPE = type;
00015     m_io.DIO_REQUEST = DIO_INPUT;
00016     m_io.DIO_PORT = port;
00017 
00018     result = _taskcall(SYSTASK, SYS_DEVIO, &m_io);
00019     *value = m_io.DIO_VALUE;
00020     return(result);
00021 }
00022