Logo Search packages:      
Sourcecode: linux version File versions  Download package

console.c

/* console.c: Routines that deal with sending and receiving IO
 *            to/from the current console device using the PROM.
 *
 * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/system.h>
#include <linux/string.h>

extern int prom_stdin, prom_stdout;

/* Non blocking get character from console input device, returns -1
 * if no input was taken.  This can be used for polling.
 */
inline int
prom_nbgetchar(void)
{
      char inc;

      if (p1275_cmd("read", P1275_ARG(1,P1275_ARG_OUT_BUF)|
                        P1275_INOUT(3,1),
                        prom_stdin, &inc, P1275_SIZE(1)) == 1)
            return inc;
      else
            return -1;
}

/* Non blocking put character to console device, returns -1 if
 * unsuccessful.
 */
inline int
prom_nbputchar(char c)
{
      char outc;
      
      outc = c;
      if (p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
                         P1275_INOUT(3,1),
                         prom_stdout, &outc, P1275_SIZE(1)) == 1)
            return 0;
      else
            return -1;
}

/* Blocking version of get character routine above. */
char
prom_getchar(void)
{
      int character;
      while((character = prom_nbgetchar()) == -1) ;
      return (char) character;
}

/* Blocking version of put character routine above. */
void
prom_putchar(char c)
{
      prom_nbputchar(c);
      return;
}

void
prom_puts(const char *s, int len)
{
      p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
                     P1275_INOUT(3,1),
                     prom_stdout, s, P1275_SIZE(len));
}

Generated by  Doxygen 1.6.0   Back to index