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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(char *buf)
{
unsigned long args[7];
args[0] = (unsigned long) "read";
args[1] = 3;
args[2] = 1;
args[3] = (unsigned int) prom_stdin;
args[4] = (unsigned long) buf;
args[5] = 1;
args[6] = (unsigned long) -1;
p1275_cmd_direct(args);
if (args[6] == 1)
return 0;
return -1;
}
/* Non blocking put character to console device, returns -1 if
* unsuccessful.
*/
static int prom_nbputchar(const char *buf)
{
unsigned long args[7];
args[0] = (unsigned long) "write";
args[1] = 3;
args[2] = 1;
args[3] = (unsigned int) prom_stdout;
args[4] = (unsigned long) buf;
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. */
void prom_getchar(char *buf)
{
while (1) {
int err = prom_nbgetchar(buf);
if (!err)
break;
}
}
/* Blocking version of put character routine above. */
void prom_putchar(const char *buf)
{
while (1) {
int err = prom_nbputchar(buf);
if (!err)
break;
}
}
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