1/* $Id: console.c,v 1.1.1.1 2007/08/03 18:51:51 Exp $
2 * console.c: Routines that deal with sending and receiving IO
3 *            to/from the current console device using the PROM.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <asm/openprom.h>
12#include <asm/oplib.h>
13#include <asm/system.h>
14#include <linux/string.h>
15
16/* Non blocking get character from console input device, returns -1
17 * if no input was taken.  This can be used for polling.
18 */
19int
20prom_nbgetchar(void)
21{
22	int i = -1;
23	unsigned long flags;
24
25	local_irq_save(flags);
26		i = (*(romvec->pv_nbgetchar))();
27	local_irq_restore(flags);
28	return i; /* Ugh, we could spin forever on unsupported proms ;( */
29}
30
31/* Non blocking put character to console device, returns -1 if
32 * unsuccessful.
33 */
34int
35prom_nbputchar(char c)
36{
37	unsigned long flags;
38	int i = -1;
39
40	local_irq_save(flags);
41		i = (*(romvec->pv_nbputchar))(c);
42	local_irq_restore(flags);
43	return i; /* Ugh, we could spin forever on unsupported proms ;( */
44}
45
46/* Blocking version of get character routine above. */
47char
48prom_getchar(void)
49{
50	int character;
51	while((character = prom_nbgetchar()) == -1) ;
52	return (char) character;
53}
54
55/* Blocking version of put character routine above. */
56void
57prom_putchar(char c)
58{
59	while(prom_nbputchar(c) == -1) ;
60	return;
61}
62
63/* Query for input device type */
64
65/* Query for output device type */
66