minix/lib/libsys/arch/i386/sys_in.c

   1 #include "syslib.h"
   2
   3 /*===========================================================================*
   4  *                                sys_in                                     *
   5  *===========================================================================*/
   6 int sys_in(port, value, type)
   7 int port;                               /* port address to read from */
   8 u32_t *value;                           /* pointer where to store value */
   9 int type;                               /* byte, word, long */
  10 {
  11     message m_io;
  12     int result;
  13
  14     m_io.m_lsys_krn_sys_devio.request = _DIO_INPUT | type;
  15     m_io.m_lsys_krn_sys_devio.port = port;
  16
  17     result = _kernel_call(SYS_DEVIO, &m_io);
  18     *value = m_io.m_krn_lsys_sys_devio.value;
  19     return(result);
  20 }
  21