/* $Id: console.c,v 1.1.1.1 2007/08/03 18:51:51 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)
 */

#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>

/* 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)
{
	int i = -1;
	unsigned long flags;

	local_irq_save(flags);
		i = (*(romvec->pv_nbgetchar))();
	local_irq_restore(flags);
	return i; /* Ugh, we could spin forever on unsupported proms ;( */
}

/* Non blocking put character to console device, returns -1 if
 * unsuccessful.
 */
int
prom_nbputchar(char c)
{
	unsigned long flags;
	int i = -1;

	local_irq_save(flags);
		i = (*(romvec->pv_nbputchar))(c);
	local_irq_restore(flags);
	return i; /* Ugh, we could spin forever on unsupported proms ;( */
}

/* 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)
{
	while(prom_nbputchar(c) == -1) ;
	return;
}

/* Query for input device type */

/* Query for output device type */