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/types.h>
30
31 #include "bootstrap.h"
32 #include "openfirm.h"
33
34 static void ofw_cons_probe(struct console *cp);
35 static int ofw_cons_init(int);
36 void ofw_cons_putchar(int);
37 int ofw_cons_getchar(void);
38 int ofw_cons_poll(void);
39
40 static ihandle_t stdin;
41 static ihandle_t stdout;
42
43 struct console ofwconsole = {
44 .c_name = "ofw",
45 .c_desc = "Open Firmware console",
46 .c_probe = ofw_cons_probe,
47 .c_init = ofw_cons_init,
48 .c_out = ofw_cons_putchar,
49 .c_in = ofw_cons_getchar,
50 .c_ready = ofw_cons_poll,
51 };
52
53 static void
ofw_cons_probe(struct console * cp)54 ofw_cons_probe(struct console *cp)
55 {
56
57 OF_getprop(chosen, "stdin", &stdin, sizeof(stdin));
58 OF_getprop(chosen, "stdout", &stdout, sizeof(stdout));
59 cp->c_flags |= C_PRESENTIN|C_PRESENTOUT;
60 }
61
62 static int
ofw_cons_init(int arg)63 ofw_cons_init(int arg)
64 {
65 return (0);
66 }
67
68 void
ofw_cons_putchar(int c)69 ofw_cons_putchar(int c)
70 {
71 char cbuf;
72
73 if (c == '\n') {
74 cbuf = '\r';
75 OF_write(stdout, &cbuf, 1);
76 }
77
78 cbuf = c;
79 OF_write(stdout, &cbuf, 1);
80 }
81
82 static int saved_char = -1;
83
84 int
ofw_cons_getchar(void)85 ofw_cons_getchar(void)
86 {
87 unsigned char ch = '\0';
88 int l;
89
90 if (saved_char != -1) {
91 l = saved_char;
92 saved_char = -1;
93 return (l);
94 }
95
96 /* At least since version 4.0.0, QEMU became bug-compatible
97 * with PowerVM's vty, by inserting a \0 after every \r.
98 * As this confuses loader's interpreter and as a \0 coming
99 * from the console doesn't seem reasonable, it's filtered here. */
100 if (OF_read(stdin, &ch, 1) > 0 && ch != '\0')
101 return (ch);
102
103 return (-1);
104 }
105
106 int
ofw_cons_poll(void)107 ofw_cons_poll(void)
108 {
109 unsigned char ch;
110
111 if (saved_char != -1)
112 return (1);
113
114 if (OF_read(stdin, &ch, 1) > 0) {
115 saved_char = ch;
116 return (1);
117 }
118
119 return (0);
120 }
121