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/* 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.
*/
static int prom_nbgetchar(void)
{
unsigned long args[7];
char inc;
args[0] = (unsigned long) "read";
args[1] = 3;
args[2] = 1;
args[3] = (unsigned int) prom_stdin;
args[4] = (unsigned long) &inc;
args[5] = 1;
args[6] = (unsigned long) -1;
p1275_cmd_direct(args);
if (args[6] == 1)
return inc;
return -1;
}
/* Non blocking put character to console device, returns -1 if
* unsuccessful.
*/
static int prom_nbputchar(char c)
{
unsigned long args[7];
char outc;
outc = c;
args[0] = (unsigned long) "write";
args[1] = 3;
args[2] = 1;
args[3] = (unsigned int) prom_stdout;
args[4] = (unsigned long) &outc;
args[5] = 1;
args[6] = (unsigned long) -1;
p1275_cmd_direct(args);
if (args[6] == 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);
}
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