minix/lib/syslib/sys_in.c
Ben Gras 9df1183b94 . removed const from putenv() for g++
. added safecopies.c:
  these are library functions to maintain grant tables in own address space
. sys_safecopy.c:
  interfaces to kernel calls to perform safe copy functions in from or to
  foreign process
. changes in i/o fields (type merged with request) reflected in
  library functions (sys_out.c, sys_vinb.c, sys_vinl.c, sys_vinw.c,
  sys_voutb.c, sys_voutl.c, sys_voutw.c)
. type merged with request in sys_sdevio, also now accepts offset which
  is used when a grant is specified (the _DIO_SAFE subtype)
. system printf() function changed to send DIAGNOSTICS_S messages, which
  specify a grant id instead of a direct address for the buffer to be
  printed; tty and log can then safecopy the buffer
2006-06-20 08:45:04 +00:00

21 lines
618 B
C

#include "syslib.h"
/*===========================================================================*
* sys_in *
*===========================================================================*/
PUBLIC int sys_in(port, value, type)
int port; /* port address to read from */
unsigned long *value; /* pointer where to store value */
int type; /* byte, word, long */
{
message m_io;
int result;
m_io.DIO_REQUEST = _DIO_INPUT | type;
m_io.DIO_PORT = port;
result = _taskcall(SYSTASK, SYS_DEVIO, &m_io);
*value = m_io.DIO_VALUE;
return(result);
}