aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc/prom/console_64.c
blob: f55d58a8a1567a653f8517598edcfe7f777b4257 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
/* 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.
 */
inline int
prom_nbgetchar(void)
{
	char inc;

	if (p1275_cmd("read", P1275_ARG(1,P1275_ARG_OUT_BUF)|
			      P1275_INOUT(3,1),
			      prom_stdin, &inc, P1275_SIZE(1)) == 1)
		return inc;
	else
		return -1;
}

/* Non blocking put character to console device, returns -1 if
 * unsuccessful.
 */
inline int
prom_nbputchar(char c)
{
	char outc;
	
	outc = c;
	if (p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
			       P1275_INOUT(3,1),
			       prom_stdout, &outc, P1275_SIZE(1)) == 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);
}

void
prom_puts(const char *s, int len)
{
	p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
			   P1275_INOUT(3,1),
			   prom_stdout, s, P1275_SIZE(len));
}