cfe_console.c revision 183424 
1/*-
2 * Copyright (c) 2007 Bruce M. Simpson.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/dev/cfe/cfe_console.c 183424 2008-09-28 03:33:01Z imp $");
29
30#include "opt_comconsole.h"
31
32#include <sys/param.h>
33#include <sys/kdb.h>
34#include <sys/kernel.h>
35#include <sys/priv.h>
36#include <sys/systm.h>
37#include <sys/types.h>
38#include <sys/conf.h>
39#include <sys/cons.h>
40#include <sys/consio.h>
41#include <sys/tty.h>
42
43#include <dev/cfe/cfe_api.h>
44#include <dev/cfe/cfe_error.h>
45
46#include <ddb/ddb.h>
47
48#ifndef	CFECONS_POLL_HZ
49#define	CFECONS_POLL_HZ	4
50#endif
51#define CFEBURSTLEN	128	/* max number of bytes to write in one chunk */
52
53static tsw_open_t cfe_tty_open;
54static tsw_close_t cfe_tty_close;
55static tsw_outwakeup_t cfe_tty_outwakeup;
56
57static struct ttydevsw cfe_ttydevsw = {
58	.tsw_flags	= TF_NOPREFIX,
59	.tsw_open	= cfe_tty_open,
60	.tsw_close	= cfe_tty_close,
61	.tsw_outwakeup	= cfe_tty_outwakeup,
62};
63
64static int			conhandle = -1;
65static struct tty		*cfe_tp = NULL;
66/* XXX does cfe have to poll? */
67static int			polltime;
68static struct callout_handle	cfe_timeouthandle
69    = CALLOUT_HANDLE_INITIALIZER(&cfe_timeouthandle);
70
71#if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER)
72static int			alt_break_state;
73#endif
74
75static void	cfe_timeout(void *);
76
77static cn_probe_t	cfe_cnprobe;
78static cn_init_t	cfe_cninit;
79static cn_term_t	cfe_cnterm;
80static cn_getc_t	cfe_cngetc;
81static cn_putc_t	cfe_cnputc;
82
83CONSOLE_DRIVER(cfe);
84
85static void
86cn_drvinit(void *unused)
87{
88	char output[32];
89	struct tty *tp;
90
91	if (cfe_consdev.cn_pri != CN_DEAD &&
92	    cfe_consdev.cn_name[0] != '\0') {
93		tp = tty_alloc(&cfe_ttydevsw, NULL, NULL);
94		tty_makedev(tp, NULL, "%s", output);
95		tty_makealias(tp, "cfecons");
96	}
97}
98
99static int
100cfe_tty_open(struct tty *tp)
101{
102	polltime = hz / CFECONS_POLL_HZ;
103	if (polltime < 1)
104		polltime = 1;
105	cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
106
107	return (0);
108}
109
110static void
111cfe_tty_close(struct tty *tp)
112{
113
114	/* XXX Should be replaced with callout_stop(9) */
115	untimeout(cfe_timeout, tp, cfe_timeouthandle);
116}
117
118static void
119cfe_tty_outwakeup(struct tty *tp)
120{
121	int len;
122	u_char buf[CFEBURSTLEN];
123
124	for (;;) {
125		len = ttydisc_getc(tp, buf, sizeof buf);
126		if (len == 0)
127			break;
128		while (cfe_write(conhandle, buf, len) == 0)
129			continue;
130	}
131}
132
133static void
134cfe_timeout(void *v)
135{
136	struct	tty *tp;
137	int 	c;
138
139	tp = (struct tty *)v;
140
141	tty_lock(tp);
142	while ((c = cfe_cngetc(NULL)) != -1)
143		ttydisc_rint(tp, c, 0);
144	ttydisc_rint_done(tp);
145	tty_unlock(tp);
146
147	cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
148}
149
150static void
151cfe_cnprobe(struct consdev *cp)
152{
153
154	conhandle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
155	if (conhandle < 0) {
156		cp->cn_pri = CN_DEAD;
157		return;
158	}
159
160	/* XXX */
161	if (bootverbose) {
162		char *bootmsg = "Using CFE firmware console.\n";
163		int i;
164
165		for (i = 0; i < strlen(bootmsg); i++)
166			cfe_cnputc(cp, bootmsg[i]);
167	}
168
169	cp->cn_pri = CN_LOW;
170}
171
172static void
173cfe_cninit(struct consdev *cp)
174{
175
176	sprintf(cp->cn_name, "cfecons");
177	cp->cn_tp = cfe_tp;
178}
179
180static void
181cfe_cnterm(struct consdev *cp)
182{
183
184}
185
186static int
187cfe_cngetc(struct consdev *cp)
188{
189	int result;
190	unsigned char ch;
191
192	while ((result = cfe_read(conhandle, &ch, 1)) == 0)
193		continue;
194
195	if (result > 0) {
196#if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER)
197		int kdb_brk;
198
199		if ((kdb_brk = kdb_alt_break(ch, &alt_break_state)) != 0) {
200			switch (kdb_brk) {
201			case KDB_REQ_DEBUGGER:
202				kdb_enter(KDB_WHY_BREAK,
203				    "Break sequence on console");
204				break;
205			case KDB_REQ_PANIC:
206				kdb_panic("Panic sequence on console");
207				break;
208			case KDB_REQ_REBOOT:
209				kdb_reboot();
210				break;
211
212			}
213		}
214#endif
215		return (ch);
216	}
217
218	return (-1);
219}
220
221static void
222cfe_cnputc(struct consdev *cp, int c)
223{
224	char cbuf;
225
226	if (c == '\n')
227		cfe_cnputc(cp, '\r');
228
229	cbuf = c;
230	while (cfe_write(conhandle, &cbuf, 1) == 0)
231		continue;
232}
233
234SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);
235