1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011 NetApp, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
15 *
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
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
37 #include <sys/types.h>
38 #include <sys/cons.h>
39 #include <sys/tty.h>
40 #include <sys/reboot.h>
41 #include <sys/bus.h>
42
43 #include <sys/kdb.h>
44 #include <ddb/ddb.h>
45
46 #ifndef BVMCONS_POLL_HZ
47 #define BVMCONS_POLL_HZ 4
48 #endif
49 #define BVMBURSTLEN 16 /* max number of bytes to write in one chunk */
50
51 static tsw_open_t bvm_tty_open;
52 static tsw_close_t bvm_tty_close;
53 static tsw_outwakeup_t bvm_tty_outwakeup;
54
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,
60 };
61
62 static int polltime;
63 static struct callout bvm_timer;
64
65 #if defined(KDB)
66 static int alt_break_state;
67 #endif
68
69 #define BVM_CONS_PORT 0x220
70 static int bvm_cons_port = BVM_CONS_PORT;
71
72 #define BVM_CONS_SIG ('b' << 8 | 'v')
73
74 static void bvm_timeout(void *);
75
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;
83
84 CONSOLE_DRIVER(bvm);
85
86 static int
bvm_rcons(u_char * ch)87 bvm_rcons(u_char *ch)
88 {
89 int c;
90
91 c = inl(bvm_cons_port);
92 if (c != -1) {
93 *ch = (u_char)c;
94 return (0);
95 } else
96 return (-1);
97 }
98
99 static void
bvm_wcons(u_char ch)100 bvm_wcons(u_char ch)
101 {
102
103 outl(bvm_cons_port, ch);
104 }
105
106 static void
cn_drvinit(void * unused)107 cn_drvinit(void *unused)
108 {
109 struct tty *tp;
110
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");
115 }
116 }
117
118 static int
bvm_tty_open(struct tty * tp)119 bvm_tty_open(struct tty *tp)
120 {
121 polltime = hz / BVMCONS_POLL_HZ;
122 if (polltime < 1)
123 polltime = 1;
124 callout_reset(&bvm_timer, polltime, bvm_timeout, tp);
125
126 return (0);
127 }
128
129 static void
bvm_tty_close(struct tty * tp)130 bvm_tty_close(struct tty *tp)
131 {
132
133 tty_lock_assert(tp, MA_OWNED);
134 callout_stop(&bvm_timer);
135 }
136
137 static void
bvm_tty_outwakeup(struct tty * tp)138 bvm_tty_outwakeup(struct tty *tp)
139 {
140 int len, written;
141 u_char buf[BVMBURSTLEN];
142
143 for (;;) {
144 len = ttydisc_getc(tp, buf, sizeof(buf));
145 if (len == 0)
146 break;
147
148 written = 0;
149 while (written < len)
150 bvm_wcons(buf[written++]);
151 }
152 }
153
154 static void
bvm_timeout(void * v)155 bvm_timeout(void *v)
156 {
157 struct tty *tp;
158 int c;
159
160 tp = (struct tty *)v;
161
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);
166
167 callout_reset(&bvm_timer, polltime, bvm_timeout, tp);
168 }
169
170 static void
bvm_cnprobe(struct consdev * cp)171 bvm_cnprobe(struct consdev *cp)
172 {
173 int disabled, port;
174
175 disabled = 0;
176 cp->cn_pri = CN_DEAD;
177 strcpy(cp->cn_name, "bvmcons");
178
179 resource_int_value("bvmconsole", 0, "disabled", &disabled);
180 if (!disabled) {
181 if (resource_int_value("bvmconsole", 0, "port", &port) == 0)
182 bvm_cons_port = port;
183
184 if (inw(bvm_cons_port) == BVM_CONS_SIG)
185 cp->cn_pri = CN_REMOTE;
186 }
187 }
188
189 static void
bvm_cninit(struct consdev * cp)190 bvm_cninit(struct consdev *cp)
191 {
192 int i;
193 const char *bootmsg = "Using bvm console.\n";
194
195 if (boothowto & RB_VERBOSE) {
196 for (i = 0; i < strlen(bootmsg); i++)
197 bvm_cnputc(cp, bootmsg[i]);
198 }
199 }
200
201 static void
bvm_cnterm(struct consdev * cp)202 bvm_cnterm(struct consdev *cp)
203 {
204
205 }
206
207 static int
bvm_cngetc(struct consdev * cp)208 bvm_cngetc(struct consdev *cp)
209 {
210 unsigned char ch;
211
212 if (bvm_rcons(&ch) == 0) {
213 #if defined(KDB)
214 kdb_alt_break(ch, &alt_break_state);
215 #endif
216 return (ch);
217 }
218
219 return (-1);
220 }
221
222 static void
bvm_cnputc(struct consdev * cp,int c)223 bvm_cnputc(struct consdev *cp, int c)
224 {
225
226 bvm_wcons(c);
227 }
228
229 static void
bvm_cngrab(struct consdev * cp)230 bvm_cngrab(struct consdev *cp)
231 {
232 }
233
234 static void
bvm_cnungrab(struct consdev * cp)235 bvm_cnungrab(struct consdev *cp)
236 {
237 }
238
239 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);
240