1/* $NetBSD: prom.c,v 1.3 1997/09/06 14:03:58 drochner Exp $ */
2
3/*-
4 * Mach Operating System
5 * Copyright (c) 1992 Carnegie Mellon University
6 * All Rights Reserved.
7 *
8 * Permission to use, copy, modify and distribute this software and its
9 * documentation is hereby granted, provided that both the copyright
10 * notice and this permission notice appear in all copies of the
11 * software, derivative works or modified versions, and any portions
12 * thereof, and that both notices appear in supporting documentation.
13 *
14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
15 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17 *
18 * Carnegie Mellon requests users of this software to return to
19 *
20 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
21 *  School of Computer Science
22 *  Carnegie Mellon University
23 *  Pittsburgh PA 15213-3890
24 *
25 * any improvements or extensions that they make and grant Carnegie Mellon
26 * the rights to redistribute these changes.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/types.h>
33
34#include "bootstrap.h"
35#include "openfirm.h"
36
37static void ofw_cons_probe(struct console *cp);
38static int ofw_cons_init(int);
39void ofw_cons_putchar(int);
40int ofw_cons_getchar(void);
41int ofw_cons_poll(void);
42
43static ihandle_t stdin;
44static ihandle_t stdout;
45
46struct console ofwconsole = {
47	"ofw",
48	"Open Firmware console",
49	0,
50	ofw_cons_probe,
51	ofw_cons_init,
52	ofw_cons_putchar,
53	ofw_cons_getchar,
54	ofw_cons_poll,
55};
56
57static void
58ofw_cons_probe(struct console *cp)
59{
60
61	OF_getprop(chosen, "stdin", &stdin, sizeof(stdin));
62	OF_getprop(chosen, "stdout", &stdout, sizeof(stdout));
63	cp->c_flags |= C_PRESENTIN|C_PRESENTOUT;
64}
65
66static int
67ofw_cons_init(int arg)
68{
69	return 0;
70}
71
72void
73ofw_cons_putchar(int c)
74{
75	char cbuf;
76
77	if (c == '\n') {
78		cbuf = '\r';
79		OF_write(stdout, &cbuf, 1);
80	}
81
82	cbuf = c;
83	OF_write(stdout, &cbuf, 1);
84}
85
86static int saved_char = -1;
87
88int
89ofw_cons_getchar()
90{
91	unsigned char ch = '\0';
92	int l;
93
94	if (saved_char != -1) {
95		l = saved_char;
96		saved_char = -1;
97		return l;
98	}
99
100	/* At least since version 4.0.0, QEMU became bug-compatible
101	 * with PowerVM's vty, by inserting a \0 after every \r.
102	 * As this confuses loader's interpreter and as a \0 coming
103	 * from the console doesn't seem reasonable, it's filtered here. */
104	if (OF_read(stdin, &ch, 1) > 0 && ch != '\0')
105		return (ch);
106
107	return (-1);
108}
109
110int
111ofw_cons_poll()
112{
113	unsigned char ch;
114
115	if (saved_char != -1)
116		return 1;
117
118	if (OF_read(stdin, &ch, 1) > 0) {
119		saved_char = ch;
120		return 1;
121	}
122
123	return 0;
124}
125