1 /*- 2 * Copyright (C) 2003,2004 3 * Hidetoshi Shimokawa. 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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * 16 * This product includes software developed by Hidetoshi Shimokawa. 17 * 18 * 4. Neither the name of the author nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $FreeBSD$ 35 */ 36 37 #include <sys/param.h> 38 #if __FreeBSD_version >= 502122 39 #include <sys/kdb.h> 40 #include <gdb/gdb.h> 41 #endif 42 #include <sys/kernel.h> 43 #include <sys/module.h> 44 #include <sys/systm.h> 45 #include <sys/types.h> 46 #include <sys/conf.h> 47 #include <sys/cons.h> 48 #include <sys/consio.h> 49 #include <sys/tty.h> 50 #include <sys/malloc.h> 51 #include <sys/priv.h> 52 #include <sys/proc.h> 53 #include <sys/ucred.h> 54 55 #include <machine/bus.h> 56 57 #ifdef __DragonFly__ 58 #include "dcons.h" 59 #include "dcons_os.h" 60 #else 61 #include <dev/dcons/dcons.h> 62 #include <dev/dcons/dcons_os.h> 63 #endif 64 65 #include <ddb/ddb.h> 66 #include <sys/reboot.h> 67 68 #include <sys/sysctl.h> 69 70 #include <vm/vm.h> 71 #include <vm/vm_param.h> 72 #include <vm/pmap.h> 73 74 #include "opt_comconsole.h" 75 #include "opt_dcons.h" 76 #include "opt_kdb.h" 77 #include "opt_gdb.h" 78 #include "opt_ddb.h" 79 80 81 #ifndef DCONS_POLL_HZ 82 #define DCONS_POLL_HZ 100 83 #endif 84 85 #ifndef DCONS_BUF_SIZE 86 #define DCONS_BUF_SIZE (16*1024) 87 #endif 88 89 #ifndef DCONS_FORCE_CONSOLE 90 #define DCONS_FORCE_CONSOLE 0 /* Mostly for FreeBSD-4/DragonFly */ 91 #endif 92 93 #ifndef DCONS_FORCE_GDB 94 #define DCONS_FORCE_GDB 1 95 #endif 96 97 #if __FreeBSD_version >= 500101 98 #define CONS_NODEV 1 99 #if __FreeBSD_version < 502122 100 static struct consdev gdbconsdev; 101 #endif 102 #endif 103 104 static d_open_t dcons_open; 105 static d_close_t dcons_close; 106 #if defined(__DragonFly__) || __FreeBSD_version < 500104 107 static d_ioctl_t dcons_ioctl; 108 #endif 109 110 static struct cdevsw dcons_cdevsw = { 111 #ifdef __DragonFly__ 112 #define CDEV_MAJOR 184 113 "dcons", CDEV_MAJOR, D_TTY, NULL, 0, 114 dcons_open, dcons_close, ttyread, ttywrite, dcons_ioctl, 115 ttypoll, nommap, nostrategy, nodump, nopsize, 116 #elif __FreeBSD_version >= 500104 117 .d_version = D_VERSION, 118 .d_open = dcons_open, 119 .d_close = dcons_close, 120 .d_name = "dcons", 121 .d_flags = D_TTY | D_NEEDGIANT, 122 #else 123 #define CDEV_MAJOR 184 124 /* open */ dcons_open, 125 /* close */ dcons_close, 126 /* read */ ttyread, 127 /* write */ ttywrite, 128 /* ioctl */ dcons_ioctl, 129 /* poll */ ttypoll, 130 /* mmap */ nommap, 131 /* strategy */ nostrategy, 132 /* name */ "dcons", 133 /* major */ CDEV_MAJOR, 134 /* dump */ nodump, 135 /* psize */ nopsize, 136 /* flags */ D_TTY, 137 #endif 138 }; 139 140 #ifndef KLD_MODULE 141 static char bssbuf[DCONS_BUF_SIZE]; /* buf in bss */ 142 #endif 143 144 /* global data */ 145 static struct dcons_global dg; 146 struct dcons_global *dcons_conf; 147 static int poll_hz = DCONS_POLL_HZ; 148 149 static struct dcons_softc sc[DCONS_NPORT]; 150 151 SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console"); 152 SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0, 153 "dcons polling rate"); 154 155 static int drv_init = 0; 156 static struct callout dcons_callout; 157 struct dcons_buf *dcons_buf; /* for local dconschat */ 158 159 #ifdef __DragonFly__ 160 #define DEV dev_t 161 #define THREAD d_thread_t 162 #elif __FreeBSD_version < 500000 163 #define DEV dev_t 164 #define THREAD struct proc 165 #else 166 #define DEV struct cdev * 167 #define THREAD struct thread 168 #endif 169 170 171 static void dcons_tty_start(struct tty *); 172 static int dcons_tty_param(struct tty *, struct termios *); 173 static void dcons_timeout(void *); 174 static int dcons_drv_init(int); 175 176 static cn_probe_t dcons_cnprobe; 177 static cn_init_t dcons_cninit; 178 static cn_term_t dcons_cnterm; 179 static cn_getc_t dcons_cngetc; 180 static cn_putc_t dcons_cnputc; 181 182 CONSOLE_DRIVER(dcons); 183 184 #if defined(GDB) && (__FreeBSD_version >= 502122) 185 static gdb_probe_f dcons_dbg_probe; 186 static gdb_init_f dcons_dbg_init; 187 static gdb_term_f dcons_dbg_term; 188 static gdb_getc_f dcons_dbg_getc; 189 static gdb_putc_f dcons_dbg_putc; 190 191 GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term, 192 dcons_dbg_getc, dcons_dbg_putc); 193 194 extern struct gdb_dbgport *gdb_cur; 195 #endif 196 197 #if (defined(GDB) || defined(DDB)) && defined(ALT_BREAK_TO_DEBUGGER) 198 static int 199 dcons_check_break(struct dcons_softc *dc, int c) 200 { 201 if (c < 0) 202 return (c); 203 204 #if __FreeBSD_version >= 502122 205 if (kdb_alt_break(c, &dc->brk_state)) { 206 if ((dc->flags & DC_GDB) != 0) { 207 #ifdef GDB 208 if (gdb_cur == &dcons_gdb_dbgport) { 209 kdb_dbbe_select("gdb"); 210 kdb_enter("Break sequence on dcons gdb port"); 211 } 212 #endif 213 } else 214 kdb_enter("Break sequence on dcons console port"); 215 } 216 #else 217 switch (dc->brk_state) { 218 case STATE1: 219 if (c == KEY_TILDE) 220 dc->brk_state = STATE2; 221 else 222 dc->brk_state = STATE0; 223 break; 224 case STATE2: 225 dc->brk_state = STATE0; 226 if (c == KEY_CTRLB) { 227 #if DCONS_FORCE_GDB 228 if (dc->flags & DC_GDB) 229 boothowto |= RB_GDB; 230 #endif 231 breakpoint(); 232 } 233 } 234 if (c == KEY_CR) 235 dc->brk_state = STATE1; 236 #endif 237 return (c); 238 } 239 #else 240 #define dcons_check_break(dc, c) (c) 241 #endif 242 243 static int 244 dcons_os_checkc(struct dcons_softc *dc) 245 { 246 int c; 247 248 EVENTHANDLER_INVOKE(dcons_poll, 0); 249 if (dg.dma_tag != NULL) 250 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD); 251 252 c = dcons_check_break(dc, dcons_checkc(dc)); 253 254 if (dg.dma_tag != NULL) 255 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD); 256 257 return (c); 258 } 259 260 #if defined(GDB) || !defined(CONS_NODEV) 261 static int 262 dcons_os_getc(struct dcons_softc *dc) 263 { 264 int c; 265 266 while ((c = dcons_os_checkc(dc)) == -1); 267 268 return (c & 0xff); 269 } 270 #endif 271 272 static void 273 dcons_os_putc(struct dcons_softc *dc, int c) 274 { 275 if (dg.dma_tag != NULL) 276 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE); 277 278 dcons_putc(dc, c); 279 280 if (dg.dma_tag != NULL) 281 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE); 282 } 283 static int 284 dcons_open(DEV dev, int flag, int mode, THREAD *td) 285 { 286 struct tty *tp; 287 int unit, error, s; 288 289 unit = minor(dev); 290 if (unit != 0) 291 return (ENXIO); 292 293 tp = dev->si_tty; 294 tp->t_oproc = dcons_tty_start; 295 tp->t_param = dcons_tty_param; 296 tp->t_stop = nottystop; 297 tp->t_dev = dev; 298 299 error = 0; 300 301 s = spltty(); 302 if ((tp->t_state & TS_ISOPEN) == 0) { 303 tp->t_state |= TS_CARR_ON; 304 ttyconsolemode(tp, 0); 305 } else if ((tp->t_state & TS_XCLUDE) && 306 priv_check(td, PRIV_TTY_EXCLUSIVE)) { 307 splx(s); 308 return (EBUSY); 309 } 310 splx(s); 311 312 #if __FreeBSD_version < 502113 313 error = (*linesw[tp->t_line].l_open)(dev, tp); 314 #else 315 error = ttyld_open(tp, dev); 316 #endif 317 318 return (error); 319 } 320 321 static int 322 dcons_close(DEV dev, int flag, int mode, THREAD *td) 323 { 324 int unit; 325 struct tty *tp; 326 327 unit = minor(dev); 328 if (unit != 0) 329 return (ENXIO); 330 331 tp = dev->si_tty; 332 if (tp->t_state & TS_ISOPEN) { 333 #if __FreeBSD_version < 502113 334 (*linesw[tp->t_line].l_close)(tp, flag); 335 ttyclose(tp); 336 #else 337 ttyld_close(tp, flag); 338 tty_close(tp); 339 #endif 340 } 341 342 return (0); 343 } 344 345 #if defined(__DragonFly__) || __FreeBSD_version < 500104 346 static int 347 dcons_ioctl(DEV dev, u_long cmd, caddr_t data, int flag, THREAD *td) 348 { 349 int unit; 350 struct tty *tp; 351 int error; 352 353 unit = minor(dev); 354 if (unit != 0) 355 return (ENXIO); 356 357 tp = dev->si_tty; 358 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td); 359 if (error != ENOIOCTL) 360 return (error); 361 362 error = ttioctl(tp, cmd, data, flag); 363 if (error != ENOIOCTL) 364 return (error); 365 366 return (ENOTTY); 367 } 368 #endif 369 370 static int 371 dcons_tty_param(struct tty *tp, struct termios *t) 372 { 373 tp->t_ispeed = t->c_ispeed; 374 tp->t_ospeed = t->c_ospeed; 375 tp->t_cflag = t->c_cflag; 376 return 0; 377 } 378 379 static void 380 dcons_tty_start(struct tty *tp) 381 { 382 struct dcons_softc *dc; 383 int s; 384 385 dc = (struct dcons_softc *)tp->t_dev->si_drv1; 386 s = spltty(); 387 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) { 388 ttwwakeup(tp); 389 return; 390 } 391 392 tp->t_state |= TS_BUSY; 393 while (tp->t_outq.c_cc != 0) 394 dcons_os_putc(dc, getc(&tp->t_outq)); 395 tp->t_state &= ~TS_BUSY; 396 397 ttwwakeup(tp); 398 splx(s); 399 } 400 401 static void 402 dcons_timeout(void *v) 403 { 404 struct tty *tp; 405 struct dcons_softc *dc; 406 int i, c, polltime; 407 408 for (i = 0; i < DCONS_NPORT; i ++) { 409 dc = &sc[i]; 410 tp = ((DEV)dc->dev)->si_tty; 411 while ((c = dcons_os_checkc(dc)) != -1) 412 if (tp->t_state & TS_ISOPEN) 413 #if __FreeBSD_version < 502113 414 (*linesw[tp->t_line].l_rint)(c, tp); 415 #else 416 ttyld_rint(tp, c); 417 #endif 418 } 419 polltime = hz / poll_hz; 420 if (polltime < 1) 421 polltime = 1; 422 callout_reset(&dcons_callout, polltime, dcons_timeout, tp); 423 } 424 425 static void 426 dcons_cnprobe(struct consdev *cp) 427 { 428 #ifdef __DragonFly__ 429 cp->cn_dev = make_dev(&dcons_cdevsw, DCONS_CON, 430 UID_ROOT, GID_WHEEL, 0600, "dcons"); 431 #elif __FreeBSD_version >= 501109 432 sprintf(cp->cn_name, "dcons"); 433 #else 434 cp->cn_dev = makedev(CDEV_MAJOR, DCONS_CON); 435 #endif 436 #if DCONS_FORCE_CONSOLE 437 cp->cn_pri = CN_REMOTE; 438 #else 439 cp->cn_pri = CN_NORMAL; 440 #endif 441 } 442 443 static void 444 dcons_cninit(struct consdev *cp) 445 { 446 dcons_drv_init(0); 447 #if CONS_NODEV 448 cp->cn_arg 449 #else 450 cp->cn_dev->si_drv1 451 #endif 452 = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */ 453 } 454 455 static void 456 dcons_cnterm(struct consdev *cp) 457 { 458 } 459 460 #if CONS_NODEV 461 static int 462 dcons_cngetc(struct consdev *cp) 463 { 464 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 465 return (dcons_os_checkc(dc)); 466 } 467 static void 468 dcons_cnputc(struct consdev *cp, int c) 469 { 470 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 471 dcons_os_putc(dc, c); 472 } 473 #else 474 static int 475 dcons_cngetc(DEV dev) 476 { 477 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 478 return (dcons_os_getc(dc)); 479 } 480 static int 481 dcons_cncheckc(DEV dev) 482 { 483 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 484 return (dcons_os_checkc(dc)); 485 } 486 static void 487 dcons_cnputc(DEV dev, int c) 488 { 489 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 490 dcons_os_putc(dc, c); 491 } 492 #endif 493 494 static int 495 dcons_drv_init(int stage) 496 { 497 #if defined(__i386__) || defined(__amd64__) 498 quad_t addr, size; 499 #endif 500 501 if (drv_init) 502 return(drv_init); 503 504 drv_init = -1; 505 506 bzero(&dg, sizeof(dg)); 507 dcons_conf = &dg; 508 dg.cdev = &dcons_consdev; 509 dg.buf = NULL; 510 dg.size = DCONS_BUF_SIZE; 511 512 #if defined(__i386__) || defined(__amd64__) 513 if (getenv_quad("dcons.addr", &addr) > 0 && 514 getenv_quad("dcons.size", &size) > 0) { 515 #ifdef __i386__ 516 vm_paddr_t pa; 517 /* 518 * Allow read/write access to dcons buffer. 519 */ 520 for (pa = trunc_page(addr); pa < addr + size; pa += PAGE_SIZE) 521 *vtopte(KERNBASE + pa) |= PG_RW; 522 invltlb(); 523 #endif 524 /* XXX P to V */ 525 dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr); 526 dg.size = size; 527 if (dcons_load_buffer(dg.buf, dg.size, sc) < 0) 528 dg.buf = NULL; 529 } 530 #endif 531 if (dg.buf != NULL) 532 goto ok; 533 534 #ifndef KLD_MODULE 535 if (stage == 0) { /* XXX or cold */ 536 /* 537 * DCONS_FORCE_CONSOLE == 1 and statically linked. 538 * called from cninit(). can't use contigmalloc yet . 539 */ 540 dg.buf = (struct dcons_buf *) bssbuf; 541 dcons_init(dg.buf, dg.size, sc); 542 } else 543 #endif 544 { 545 /* 546 * DCONS_FORCE_CONSOLE == 0 or kernel module case. 547 * if the module is loaded after boot, 548 * bssbuf could be non-continuous. 549 */ 550 dg.buf = (struct dcons_buf *) contigmalloc(dg.size, 551 M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul); 552 dcons_init(dg.buf, dg.size, sc); 553 } 554 555 ok: 556 dcons_buf = dg.buf; 557 558 #if __FreeBSD_version < 502122 559 #if defined(DDB) && DCONS_FORCE_GDB 560 #if CONS_NODEV 561 gdbconsdev.cn_arg = (void *)&sc[DCONS_GDB]; 562 #if __FreeBSD_version >= 501109 563 sprintf(gdbconsdev.cn_name, "dgdb"); 564 #endif 565 gdb_arg = &gdbconsdev; 566 #elif defined(__DragonFly__) 567 gdbdev = make_dev(&dcons_cdevsw, DCONS_GDB, 568 UID_ROOT, GID_WHEEL, 0600, "dgdb"); 569 #else 570 gdbdev = makedev(CDEV_MAJOR, DCONS_GDB); 571 #endif 572 gdb_getc = dcons_cngetc; 573 gdb_putc = dcons_cnputc; 574 #endif 575 #endif 576 drv_init = 1; 577 578 return 0; 579 } 580 581 582 static int 583 dcons_attach_port(int port, char *name, int flags) 584 { 585 struct dcons_softc *dc; 586 struct tty *tp; 587 DEV dev; 588 589 dc = &sc[port]; 590 dc->flags = flags; 591 dev = make_dev(&dcons_cdevsw, port, 592 UID_ROOT, GID_WHEEL, 0600, name); 593 dc->dev = (void *)dev; 594 tp = ttyalloc(); 595 596 dev->si_drv1 = (void *)dc; 597 dev->si_tty = tp; 598 599 tp->t_oproc = dcons_tty_start; 600 tp->t_param = dcons_tty_param; 601 tp->t_stop = nottystop; 602 tp->t_dev = dc->dev; 603 604 return(0); 605 } 606 607 static int 608 dcons_attach(void) 609 { 610 int polltime; 611 612 #ifdef __DragonFly__ 613 cdevsw_add(&dcons_cdevsw, -1, 0); 614 #endif 615 dcons_attach_port(DCONS_CON, "dcons", 0); 616 dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB); 617 #if __FreeBSD_version < 500000 618 callout_init(&dcons_callout); 619 #else 620 callout_init(&dcons_callout, 0); 621 #endif 622 polltime = hz / poll_hz; 623 if (polltime < 1) 624 polltime = 1; 625 callout_reset(&dcons_callout, polltime, dcons_timeout, NULL); 626 return(0); 627 } 628 629 static int 630 dcons_detach(int port) 631 { 632 struct tty *tp; 633 struct dcons_softc *dc; 634 635 dc = &sc[port]; 636 637 tp = ((DEV)dc->dev)->si_tty; 638 639 if (tp->t_state & TS_ISOPEN) { 640 printf("dcons: still opened\n"); 641 #if __FreeBSD_version < 502113 642 (*linesw[tp->t_line].l_close)(tp, 0); 643 tp->t_gen++; 644 ttyclose(tp); 645 ttwakeup(tp); 646 ttwwakeup(tp); 647 #else 648 ttyld_close(tp, 0); 649 tty_close(tp); 650 #endif 651 } 652 /* XXX 653 * must wait until all device are closed. 654 */ 655 #ifdef __DragonFly__ 656 tsleep((void *)dc, 0, "dcodtc", hz/4); 657 #else 658 tsleep((void *)dc, PWAIT, "dcodtc", hz/4); 659 #endif 660 destroy_dev(dc->dev); 661 662 return(0); 663 } 664 665 666 /* cnXXX works only for FreeBSD-5 */ 667 static int 668 dcons_modevent(module_t mode, int type, void *data) 669 { 670 int err = 0, ret; 671 672 switch (type) { 673 case MOD_LOAD: 674 ret = dcons_drv_init(1); 675 dcons_attach(); 676 #if __FreeBSD_version >= 500000 677 if (ret == 0) { 678 dcons_cnprobe(&dcons_consdev); 679 dcons_cninit(&dcons_consdev); 680 cnadd(&dcons_consdev); 681 } 682 #endif 683 break; 684 case MOD_UNLOAD: 685 printf("dcons: unload\n"); 686 callout_stop(&dcons_callout); 687 #if __FreeBSD_version < 502122 688 #if defined(DDB) && DCONS_FORCE_GDB 689 #if CONS_NODEV 690 gdb_arg = NULL; 691 #else 692 gdbdev = NULL; 693 #endif 694 #endif 695 #endif 696 #if __FreeBSD_version >= 500000 697 cnremove(&dcons_consdev); 698 #endif 699 dcons_detach(DCONS_CON); 700 dcons_detach(DCONS_GDB); 701 dg.buf->magic = 0; 702 703 contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF); 704 705 break; 706 case MOD_SHUTDOWN: 707 #if 0 /* Keep connection after halt */ 708 dg.buf->magic = 0; 709 #endif 710 break; 711 default: 712 err = EOPNOTSUPP; 713 break; 714 } 715 return(err); 716 } 717 718 #if defined(GDB) && (__FreeBSD_version >= 502122) 719 /* Debugger interface */ 720 721 static int 722 dcons_dbg_probe(void) 723 { 724 int dcons_gdb; 725 726 if (getenv_int("dcons_gdb", &dcons_gdb) == 0) 727 return (-1); 728 return (dcons_gdb); 729 } 730 731 static void 732 dcons_dbg_init(void) 733 { 734 } 735 736 static void 737 dcons_dbg_term(void) 738 { 739 } 740 741 static void 742 dcons_dbg_putc(int c) 743 { 744 struct dcons_softc *dc = &sc[DCONS_GDB]; 745 dcons_os_putc(dc, c); 746 } 747 748 static int 749 dcons_dbg_getc(void) 750 { 751 struct dcons_softc *dc = &sc[DCONS_GDB]; 752 return (dcons_os_getc(dc)); 753 } 754 #endif 755 756 DEV_MODULE(dcons, dcons_modevent, NULL); 757 MODULE_VERSION(dcons, DCONS_VERSION); 758