vkernel - more crit section work to avoid pthread reentrancy.
[dragonfly.git] / sys / platform / vkernel / platform / console.c
CommitLineData
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1/*
2 * Copyright (c) 2006 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
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 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
0df380ef 34 * $DragonFly: src/sys/platform/vkernel/platform/console.c,v 1.17 2007/07/02 04:19:14 dillon Exp $
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35 */
36
37#include <sys/systm.h>
38#include <sys/kernel.h>
39#include <sys/conf.h>
40#include <sys/cons.h>
41#include <sys/tty.h>
42#include <sys/termios.h>
43#include <sys/fcntl.h>
30809ad1 44#include <sys/signalvar.h>
db74ac99 45#include <sys/eventhandler.h>
0df380ef 46#include <sys/interrupt.h>
cb118784 47#include <machine/md_var.h>
6f7b98e0 48#include <unistd.h>
e7f2d7de 49#include <termios.h>
3c5a0ece 50#include <stdlib.h>
6f7b98e0 51
aaf8b91f 52static int console_stolen_by_kernel;
9aeb4297 53static struct kqueue_info *kqueue_console_info;
aaf8b91f 54
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55/*
56 * Global console locking functions
57 */
58void
59cons_lock(void)
60{
61}
62
63void
64cons_unlock(void)
65{
66}
67
68/************************************************************************
69 * CONSOLE DEVICE *
70 ************************************************************************
71 *
72 */
73
a72d8a9f 74#define CDEV_MAJOR 12 /* steal the same major as /dev/ttyv* */
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75
76static int vcons_tty_param(struct tty *tp, struct termios *tio);
77static void vcons_tty_start(struct tty *tp);
9aeb4297 78static void vcons_intr(void *tpx, struct intrframe *frame __unused);
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79
80static d_open_t vcons_open;
81static d_close_t vcons_close;
82static d_ioctl_t vcons_ioctl;
83
84static struct dev_ops vcons_ops = {
85 { "vcons", CDEV_MAJOR, D_TTY },
86 .d_open = vcons_open,
87 .d_close = vcons_close,
88 .d_read = ttyread,
89 .d_write = ttywrite,
90 .d_ioctl = vcons_ioctl,
91 .d_poll = ttypoll,
92};
93
94static int
95vcons_open(struct dev_open_args *ap)
96{
97 cdev_t dev = ap->a_head.a_dev;
98 struct tty *tp;
99 int error;
100
6f7b98e0 101 tp = dev->si_tty = ttymalloc(dev->si_tty);
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102 if ((tp->t_state & TS_ISOPEN) == 0) {
103 tp->t_oproc = vcons_tty_start;
104 tp->t_param = vcons_tty_param;
105 tp->t_stop = nottystop;
106 tp->t_dev = dev;
107
108 tp->t_state |= TS_CARR_ON | TS_CONNECTED;
109 ttychars(tp);
110 tp->t_iflag = TTYDEF_IFLAG;
111 tp->t_oflag = TTYDEF_OFLAG;
112 tp->t_cflag = TTYDEF_CFLAG;
113 tp->t_lflag = TTYDEF_LFLAG;
114 tp->t_ispeed = TTYDEF_SPEED;
115 tp->t_ospeed = TTYDEF_SPEED;
116 ttsetwater(tp);
aaf8b91f 117 }
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118 if (minor(dev) == 0) {
119 error = (*linesw[tp->t_line].l_open)(dev, tp);
120 ioctl(0, TIOCGWINSZ, &tp->t_winsize);
121
122 if (kqueue_console_info == NULL)
123 kqueue_console_info = kqueue_add(0, vcons_intr, tp);
124 } else {
125 /* dummy up other minors so the installer will run */
126 error = 0;
127 }
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128 return(error);
129}
130
131static int
132vcons_close(struct dev_close_args *ap)
133{
134 cdev_t dev = ap->a_head.a_dev;
135 struct tty *tp;
136
6f7b98e0 137 tp = dev->si_tty;
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138 (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
139 ttyclose(tp);
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140 return(0);
141}
142
143static int
144vcons_ioctl(struct dev_ioctl_args *ap)
145{
146 cdev_t dev = ap->a_head.a_dev;
147 struct tty *tp;
148 int error;
149
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150 tp = dev->si_tty;
151 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
152 ap->a_fflag, ap->a_cred);
153 if (error != ENOIOCTL)
154 return (error);
155 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
156 if (error != ENOIOCTL)
157 return (error);
158 return (ENOTTY);
159}
160
161static int
162vcons_tty_param(struct tty *tp, struct termios *tio)
163{
164 tp->t_ispeed = tio->c_ispeed;
165 tp->t_ospeed = tio->c_ospeed;
166 tp->t_cflag = tio->c_cflag;
167 return(0);
168}
169
170static void
171vcons_tty_start(struct tty *tp)
172{
173 int n;
174 char buf[64];
175
176 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
177 ttwwakeup(tp);
178 return;
179 }
180 tp->t_state |= TS_BUSY;
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181 while ((n = q_to_b(&tp->t_outq, buf, sizeof(buf))) > 0) {
182 /*
183 * Dummy up ttyv1, etc.
184 */
03bcb4ab 185 if (minor(tp->t_dev) == 0) {
94131955 186 pwrite(1, buf, n, -1);
03bcb4ab 187 }
a72d8a9f 188 }
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189 tp->t_state &= ~TS_BUSY;
190 ttwwakeup(tp);
191}
192
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193static
194void
9aeb4297 195vcons_intr(void *tpx, struct intrframe *frame __unused)
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196{
197 struct tty *tp = tpx;
198 unsigned char buf[32];
199 int i;
200 int n;
201
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202 /*
203 * If we aren't open we only have synchronous traffic via the
204 * debugger and do not need to poll.
205 */
206 if ((tp->t_state & TS_ISOPEN) == 0)
207 return;
208
209 /*
210 * Only poll if we are open and haven't been stolen by the debugger.
211 */
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212 if (console_stolen_by_kernel == 0 && (tp->t_state & TS_ISOPEN)) {
213 do {
b09fd398 214 n = extpread(0, buf, sizeof(buf), O_FNONBLOCKING, -1LL);
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215 for (i = 0; i < n; ++i)
216 (*linesw[tp->t_line].l_rint)(buf[i], tp);
217 } while (n > 0);
218 }
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219}
220
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221/************************************************************************
222 * KERNEL CONSOLE INTERFACE *
223 ************************************************************************
224 *
225 * Kernel direct-call interface console driver
226 */
227static cn_probe_t vconsprobe;
228static cn_init_t vconsinit;
ce81f184 229static cn_init_fini_t vconsinit_fini;
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230static cn_term_t vconsterm;
231static cn_getc_t vconsgetc;
232static cn_checkc_t vconscheckc;
233static cn_putc_t vconsputc;
234
ce81f184 235CONS_DRIVER(vcons, vconsprobe, vconsinit, vconsinit_fini, vconsterm, vconsgetc,
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236 vconscheckc, vconsputc, NULL);
237
3c5a0ece 238static struct termios init_tio;
30809ad1 239static struct consdev *vconsole;
3c5a0ece 240
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241static void
242vconsprobe(struct consdev *cp)
243{
e7f2d7de 244 cp->cn_pri = CN_NORMAL;
ce81f184 245 cp->cn_probegood = 1;
3c5a0ece 246}
e7f2d7de 247
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248/*
249 * This is a little bulky handler to set proper terminal
250 * settings in the case of a signal which might lead to
251 * termination or suspension.
252 */
253static void
254vconssignal(int sig)
255{
256 struct termios curtio;
257 struct sigaction sa, osa;
258 sigset_t ss, oss;
259
260 tcgetattr(0, &curtio);
261 tcsetattr(0, TCSAFLUSH, &init_tio);
262 bzero(&sa, sizeof(sa));
263 sigemptyset(&sa.sa_mask);
264 sa.sa_handler = SIG_DFL;
265 sigaction(sig, &sa, &osa);
266 sigemptyset(&ss);
267 sigaddset(&ss, sig);
268 sigprocmask(SIG_UNBLOCK, &ss, &oss);
269 raise(sig); /* now hand down the sig */
270 sigprocmask(SIG_SETMASK, &oss, NULL);
271 sigaction(sig, &osa, NULL);
272 tcsetattr(0, TCSAFLUSH, &curtio);
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273}
274
30809ad1 275static void
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276vconswinchsig(int __unused sig)
277{
278 signalintr(3);
279}
280
281static void
282vconswinch_intr(void *arg __unused, void *frame __unused)
30809ad1
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283{
284 struct winsize newsize;
285
286 if (vconsole != NULL && vconsole->cn_dev->si_tty != NULL) {
287 ioctl(0, TIOCGWINSZ, &newsize);
288 /*
289 * ttioctl(vconsole->cn_dev->si_tty, TIOCSWINSZ, &newsize, 0);
290 * I wished. Unfortunately this needs a curproc, so do it
291 * manually.
292 */
293 if (bcmp(&newsize, &vconsole->cn_dev->si_tty->t_winsize,
294 sizeof(newsize)) != 0) {
295 vconsole->cn_dev->si_tty->t_winsize = newsize;
296 pgsignal(vconsole->cn_dev->si_tty->t_pgrp, SIGWINCH, 1);
297 }
298 }
299}
300
301static void
302vconscleanup(void)
3c5a0ece 303{
db74ac99
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304 /*
305 * We might catch stray SIGIOs, so try hard.
306 */
307 while (tcsetattr(0, TCSAFLUSH, &init_tio) != 0 && errno == EINTR)
308 /* NOTHING */;
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309}
310
311static void
312vconsinit(struct consdev *cp)
313{
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314 struct sigaction sa;
315
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316 vconsole = cp;
317
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318 tcgetattr(0, &init_tio);
319 bzero(&sa, sizeof(sa));
320 sigemptyset(&sa.sa_mask);
321 sa.sa_handler = vconssignal;
322 sigaction(SIGTSTP, &sa, NULL);
323 sigaction(SIGINT, &sa, NULL);
324 sigaction(SIGTERM, &sa, NULL);
325 atexit(vconscleanup);
3c5a0ece 326 vcons_set_mode(0);
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327}
328
329static void
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330vconsinit_fini(struct consdev *cp)
331{
0df380ef 332 struct sigaction sa;
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333 cdev_t dev;
334 int i;
335
336 /*
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337 * We have to do this here rather then in early boot to be able
338 * to use the interrupt subsystem.
339 */
340 register_int(3, vconswinch_intr, NULL, "swinch", NULL, 0);
341 bzero(&sa, sizeof(sa));
342 sigemptyset(&sa.sa_mask);
343 sa.sa_handler = vconswinchsig;
344 sigaction(SIGWINCH, &sa, NULL);
345
346 /*
a72d8a9f
MD
347 * Implement ttyv0-ttyv7. At the moment ttyv1-7 are sink nulls.
348 */
349 dev_ops_add(&vcons_ops, -1 & ~7, 0);
350 for (i = 0; i < 8; ++i) {
351 dev = make_dev(&vcons_ops, i,
352 UID_ROOT, GID_WHEEL, 0600, "ttyv%d", i);
353 if (i == 0)
354 cp->cn_dev = dev;
355 }
db74ac99 356 EVENTHANDLER_REGISTER(shutdown_final, vconscleanup, NULL, SHUTDOWN_PRI_LAST);
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357}
358
359static void
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360vconsterm(struct consdev *vp)
361{
30809ad1 362 vconsole = NULL;
3c5a0ece 363 vconscleanup();
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364}
365
366static int
ce81f184 367vconsgetc(void *private)
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368{
369 unsigned char c;
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370 ssize_t n;
371
aaf8b91f 372 console_stolen_by_kernel = 1;
6092278a 373 for (;;) {
94131955 374 n = pread(0, &c, 1, -1);
03bcb4ab 375 if (n == 1)
aaf8b91f 376 break;
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MD
377 if (n < 0 && errno == EINTR)
378 continue;
379 panic("vconsgetc: EOF on console %d %d", n ,errno);
380 }
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381 console_stolen_by_kernel = 0;
382 return((int)c);
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383}
384
385static int
ce81f184 386vconscheckc(void *private)
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387{
388 unsigned char c;
389
b09fd398 390 if (extpread(0, &c, 1, O_FNONBLOCKING, -1LL) == 1)
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391 return((int)c);
392 return(-1);
393}
394
395static void
ce81f184 396vconsputc(void *private, int c)
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397{
398 char cc = c;
399
94131955 400 pwrite(1, &cc, 1, -1);
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401}
402
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403void
404vcons_set_mode(int in_debugger)
405{
406 struct termios tio;
407
408 if (tcgetattr(0, &tio) < 0)
409 return;
410 cfmakeraw(&tio);
1b40cca7 411 tio.c_oflag |= OPOST | ONLCR;
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MD
412 tio.c_lflag |= ISIG;
413 if (in_debugger) {
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414 tio.c_cc[VINTR] = init_tio.c_cc[VINTR];
415 tio.c_cc[VSUSP] = init_tio.c_cc[VSUSP];
416 tio.c_cc[VSTATUS] = init_tio.c_cc[VSTATUS];
cb118784 417 } else {
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418 tio.c_cc[VINTR] = _POSIX_VDISABLE;
419 tio.c_cc[VSUSP] = _POSIX_VDISABLE;
420 tio.c_cc[VSTATUS] = _POSIX_VDISABLE;
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MD
421 }
422 tcsetattr(0, TCSAFLUSH, &tio);
423}