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/* $Id: console.c,v 1.10 1996/12/18 06:46:54 tridge Exp $
* 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@caip.rutgers.edu)
* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#include "promlib.h"
/* Non blocking get character from console input device, returns -1
* if no input was taken. This can be used for polling.
*/
int
prom_nbgetchar(void)
{
static char inc;
int i = -1;
switch(prom_vers) {
case PROM_V0:
i = (*(romvec->pv_nbgetchar))();
break;
case PROM_V2:
case PROM_V3:
if((*(romvec->pv_v2devops).v2_dev_read)(prom_stdin , &inc, 1) == 1)
i = inc;
break;
case PROM_P1275:
if (p1275_cmd ("read", 3, prom_stdin, &inc, 1) == 1)
i = inc;
break;
}
return i;
}
/* Non blocking put character to console device, returns -1 if
* unsuccessful.
*/
int
prom_nbputchar(char c)
{
static char outc;
int i = -1;
switch(prom_vers) {
case PROM_V0:
i = (*(romvec->pv_nbputchar))(c);
break;
case PROM_V2:
case PROM_V3:
outc = c;
if( (*(romvec->pv_v2devops).v2_dev_write)(prom_stdout, &outc, 1) == 1)
i = 0;
break;
case PROM_P1275:
outc = c;
if (p1275_cmd ("write", 3, prom_stdout, &outc, 1) == 1)
i = 0;
break;
}
return i;
}
/* 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)
{
if (prom_vers == PROM_P1275)
prom_nbputchar(c);
else
while(prom_nbputchar(c) == -1) ;
}
void
prom_puts (char *s, int len)
{
switch(prom_vers) {
case PROM_V0:
case PROM_V2:
(*(romvec->pv_printf))(s);
break;
case PROM_V3:
(*(romvec->pv_v2devops).v2_dev_write)(prom_stdout, s, len);
break;
case PROM_P1275:
p1275_cmd ("write", 3, prom_stdout, s, len);
break;
}
}
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