2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2011 NetApp, Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
37 #include <sys/types.h>
40 #include <sys/reboot.h>
46 #ifndef BVMCONS_POLL_HZ
47 #define BVMCONS_POLL_HZ 4
49 #define BVMBURSTLEN 16 /* max number of bytes to write in one chunk */
51 static tsw_open_t bvm_tty_open;
52 static tsw_close_t bvm_tty_close;
53 static tsw_outwakeup_t bvm_tty_outwakeup;
55 static struct ttydevsw bvm_ttydevsw = {
56 .tsw_flags = TF_NOPREFIX,
57 .tsw_open = bvm_tty_open,
58 .tsw_close = bvm_tty_close,
59 .tsw_outwakeup = bvm_tty_outwakeup,
63 static struct callout bvm_timer;
66 static int alt_break_state;
69 #define BVM_CONS_PORT 0x220
70 static int bvm_cons_port = BVM_CONS_PORT;
72 #define BVM_CONS_SIG ('b' << 8 | 'v')
74 static void bvm_timeout(void *);
76 static cn_probe_t bvm_cnprobe;
77 static cn_init_t bvm_cninit;
78 static cn_term_t bvm_cnterm;
79 static cn_getc_t bvm_cngetc;
80 static cn_putc_t bvm_cnputc;
81 static cn_grab_t bvm_cngrab;
82 static cn_ungrab_t bvm_cnungrab;
91 c = inl(bvm_cons_port);
103 outl(bvm_cons_port, ch);
107 cn_drvinit(void *unused)
111 if (bvm_consdev.cn_pri != CN_DEAD) {
112 tp = tty_alloc(&bvm_ttydevsw, NULL);
113 callout_init_mtx(&bvm_timer, tty_getlock(tp), 0);
114 tty_makedev(tp, NULL, "bvmcons");
119 bvm_tty_open(struct tty *tp)
121 polltime = hz / BVMCONS_POLL_HZ;
124 callout_reset(&bvm_timer, polltime, bvm_timeout, tp);
130 bvm_tty_close(struct tty *tp)
133 tty_lock_assert(tp, MA_OWNED);
134 callout_stop(&bvm_timer);
138 bvm_tty_outwakeup(struct tty *tp)
141 u_char buf[BVMBURSTLEN];
144 len = ttydisc_getc(tp, buf, sizeof(buf));
149 while (written < len)
150 bvm_wcons(buf[written++]);
160 tp = (struct tty *)v;
162 tty_lock_assert(tp, MA_OWNED);
163 while ((c = bvm_cngetc(NULL)) != -1)
164 ttydisc_rint(tp, c, 0);
165 ttydisc_rint_done(tp);
167 callout_reset(&bvm_timer, polltime, bvm_timeout, tp);
171 bvm_cnprobe(struct consdev *cp)
176 cp->cn_pri = CN_DEAD;
177 strcpy(cp->cn_name, "bvmcons");
179 resource_int_value("bvmconsole", 0, "disabled", &disabled);
181 if (resource_int_value("bvmconsole", 0, "port", &port) == 0)
182 bvm_cons_port = port;
184 if (inw(bvm_cons_port) == BVM_CONS_SIG)
185 cp->cn_pri = CN_REMOTE;
190 bvm_cninit(struct consdev *cp)
193 const char *bootmsg = "Using bvm console.\n";
195 if (boothowto & RB_VERBOSE) {
196 for (i = 0; i < strlen(bootmsg); i++)
197 bvm_cnputc(cp, bootmsg[i]);
202 bvm_cnterm(struct consdev *cp)
208 bvm_cngetc(struct consdev *cp)
212 if (bvm_rcons(&ch) == 0) {
214 kdb_alt_break(ch, &alt_break_state);
223 bvm_cnputc(struct consdev *cp, int c)
230 bvm_cngrab(struct consdev *cp)
235 bvm_cnungrab(struct consdev *cp)
239 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);