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_nopoll(struct dcons_softc *dc) 245 { 246 int c; 247 248 if (dg.dma_tag != NULL) 249 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD); 250 251 c = dcons_check_break(dc, dcons_checkc(dc)); 252 253 if (dg.dma_tag != NULL) 254 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD); 255 256 return (c); 257 } 258 259 static int 260 dcons_os_checkc(struct dcons_softc *dc) 261 { 262 EVENTHANDLER_INVOKE(dcons_poll, 0); 263 return (dcons_os_checkc_nopoll(dc)); 264 } 265 266 #if defined(GDB) || !defined(CONS_NODEV) 267 static int 268 dcons_os_getc(struct dcons_softc *dc) 269 { 270 int c; 271 272 while ((c = dcons_os_checkc(dc)) == -1); 273 274 return (c & 0xff); 275 } 276 #endif 277 278 static void 279 dcons_os_putc(struct dcons_softc *dc, int c) 280 { 281 if (dg.dma_tag != NULL) 282 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE); 283 284 dcons_putc(dc, c); 285 286 if (dg.dma_tag != NULL) 287 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE); 288 } 289 static int 290 dcons_open(DEV dev, int flag, int mode, THREAD *td) 291 { 292 struct tty *tp; 293 int unit, error, s; 294 295 unit = minor(dev); 296 if (unit != 0) 297 return (ENXIO); 298 299 tp = dev->si_tty; 300 tp->t_oproc = dcons_tty_start; 301 tp->t_param = dcons_tty_param; 302 tp->t_stop = nottystop; 303 tp->t_dev = dev; 304 305 error = 0; 306 307 s = spltty(); 308 if ((tp->t_state & TS_ISOPEN) == 0) { 309 tp->t_state |= TS_CARR_ON; 310 ttyconsolemode(tp, 0); 311 } else if ((tp->t_state & TS_XCLUDE) && 312 priv_check(td, PRIV_TTY_EXCLUSIVE)) { 313 splx(s); 314 return (EBUSY); 315 } 316 splx(s); 317 318 #if __FreeBSD_version < 502113 319 error = (*linesw[tp->t_line].l_open)(dev, tp); 320 #else 321 error = ttyld_open(tp, dev); 322 #endif 323 324 return (error); 325 } 326 327 static int 328 dcons_close(DEV dev, int flag, int mode, THREAD *td) 329 { 330 int unit; 331 struct tty *tp; 332 333 unit = minor(dev); 334 if (unit != 0) 335 return (ENXIO); 336 337 tp = dev->si_tty; 338 if (tp->t_state & TS_ISOPEN) { 339 #if __FreeBSD_version < 502113 340 (*linesw[tp->t_line].l_close)(tp, flag); 341 ttyclose(tp); 342 #else 343 ttyld_close(tp, flag); 344 tty_close(tp); 345 #endif 346 } 347 348 return (0); 349 } 350 351 #if defined(__DragonFly__) || __FreeBSD_version < 500104 352 static int 353 dcons_ioctl(DEV dev, u_long cmd, caddr_t data, int flag, THREAD *td) 354 { 355 int unit; 356 struct tty *tp; 357 int error; 358 359 unit = minor(dev); 360 if (unit != 0) 361 return (ENXIO); 362 363 tp = dev->si_tty; 364 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td); 365 if (error != ENOIOCTL) 366 return (error); 367 368 error = ttioctl(tp, cmd, data, flag); 369 if (error != ENOIOCTL) 370 return (error); 371 372 return (ENOTTY); 373 } 374 #endif 375 376 static int 377 dcons_tty_param(struct tty *tp, struct termios *t) 378 { 379 tp->t_ispeed = t->c_ispeed; 380 tp->t_ospeed = t->c_ospeed; 381 tp->t_cflag = t->c_cflag; 382 return 0; 383 } 384 385 static void 386 dcons_tty_start(struct tty *tp) 387 { 388 struct dcons_softc *dc; 389 int s; 390 391 dc = (struct dcons_softc *)tp->t_dev->si_drv1; 392 s = spltty(); 393 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) { 394 ttwwakeup(tp); 395 return; 396 } 397 398 tp->t_state |= TS_BUSY; 399 while (tp->t_outq.c_cc != 0) 400 dcons_os_putc(dc, getc(&tp->t_outq)); 401 tp->t_state &= ~TS_BUSY; 402 403 ttwwakeup(tp); 404 splx(s); 405 } 406 407 static void 408 dcons_timeout(void *v) 409 { 410 struct tty *tp; 411 struct dcons_softc *dc; 412 int i, c, polltime; 413 414 for (i = 0; i < DCONS_NPORT; i ++) { 415 dc = &sc[i]; 416 tp = ((DEV)dc->dev)->si_tty; 417 while ((c = dcons_os_checkc_nopoll(dc)) != -1) 418 if (tp->t_state & TS_ISOPEN) 419 #if __FreeBSD_version < 502113 420 (*linesw[tp->t_line].l_rint)(c, tp); 421 #else 422 ttyld_rint(tp, c); 423 #endif 424 } 425 polltime = hz / poll_hz; 426 if (polltime < 1) 427 polltime = 1; 428 callout_reset(&dcons_callout, polltime, dcons_timeout, tp); 429 } 430 431 static void 432 dcons_cnprobe(struct consdev *cp) 433 { 434 #ifdef __DragonFly__ 435 cp->cn_dev = make_dev(&dcons_cdevsw, DCONS_CON, 436 UID_ROOT, GID_WHEEL, 0600, "dcons"); 437 #elif __FreeBSD_version >= 501109 438 sprintf(cp->cn_name, "dcons"); 439 #else 440 cp->cn_dev = makedev(CDEV_MAJOR, DCONS_CON); 441 #endif 442 #if DCONS_FORCE_CONSOLE 443 cp->cn_pri = CN_REMOTE; 444 #else 445 cp->cn_pri = CN_NORMAL; 446 #endif 447 } 448 449 static void 450 dcons_cninit(struct consdev *cp) 451 { 452 dcons_drv_init(0); 453 #if CONS_NODEV 454 cp->cn_arg 455 #else 456 cp->cn_dev->si_drv1 457 #endif 458 = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */ 459 } 460 461 static void 462 dcons_cnterm(struct consdev *cp) 463 { 464 } 465 466 #if CONS_NODEV 467 static int 468 dcons_cngetc(struct consdev *cp) 469 { 470 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 471 return (dcons_os_checkc(dc)); 472 } 473 static void 474 dcons_cnputc(struct consdev *cp, int c) 475 { 476 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 477 dcons_os_putc(dc, c); 478 } 479 #else 480 static int 481 dcons_cngetc(DEV dev) 482 { 483 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 484 return (dcons_os_getc(dc)); 485 } 486 static int 487 dcons_cncheckc(DEV dev) 488 { 489 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 490 return (dcons_os_checkc(dc)); 491 } 492 static void 493 dcons_cnputc(DEV dev, int c) 494 { 495 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 496 dcons_os_putc(dc, c); 497 } 498 #endif 499 500 static int 501 dcons_drv_init(int stage) 502 { 503 #if defined(__i386__) || defined(__amd64__) 504 quad_t addr, size; 505 #endif 506 507 if (drv_init) 508 return(drv_init); 509 510 drv_init = -1; 511 512 bzero(&dg, sizeof(dg)); 513 dcons_conf = &dg; 514 dg.cdev = &dcons_consdev; 515 dg.buf = NULL; 516 dg.size = DCONS_BUF_SIZE; 517 518 #if defined(__i386__) || defined(__amd64__) 519 if (getenv_quad("dcons.addr", &addr) > 0 && 520 getenv_quad("dcons.size", &size) > 0) { 521 #ifdef __i386__ 522 vm_paddr_t pa; 523 /* 524 * Allow read/write access to dcons buffer. 525 */ 526 for (pa = trunc_page(addr); pa < addr + size; pa += PAGE_SIZE) 527 *vtopte(KERNBASE + pa) |= PG_RW; 528 invltlb(); 529 #endif 530 /* XXX P to V */ 531 dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr); 532 dg.size = size; 533 if (dcons_load_buffer(dg.buf, dg.size, sc) < 0) 534 dg.buf = NULL; 535 } 536 #endif 537 if (dg.buf != NULL) 538 goto ok; 539 540 #ifndef KLD_MODULE 541 if (stage == 0) { /* XXX or cold */ 542 /* 543 * DCONS_FORCE_CONSOLE == 1 and statically linked. 544 * called from cninit(). can't use contigmalloc yet . 545 */ 546 dg.buf = (struct dcons_buf *) bssbuf; 547 dcons_init(dg.buf, dg.size, sc); 548 } else 549 #endif 550 { 551 /* 552 * DCONS_FORCE_CONSOLE == 0 or kernel module case. 553 * if the module is loaded after boot, 554 * bssbuf could be non-continuous. 555 */ 556 dg.buf = (struct dcons_buf *) contigmalloc(dg.size, 557 M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul); 558 dcons_init(dg.buf, dg.size, sc); 559 } 560 561 ok: 562 dcons_buf = dg.buf; 563 564 #if __FreeBSD_version < 502122 565 #if defined(DDB) && DCONS_FORCE_GDB 566 #if CONS_NODEV 567 gdbconsdev.cn_arg = (void *)&sc[DCONS_GDB]; 568 #if __FreeBSD_version >= 501109 569 sprintf(gdbconsdev.cn_name, "dgdb"); 570 #endif 571 gdb_arg = &gdbconsdev; 572 #elif defined(__DragonFly__) 573 gdbdev = make_dev(&dcons_cdevsw, DCONS_GDB, 574 UID_ROOT, GID_WHEEL, 0600, "dgdb"); 575 #else 576 gdbdev = makedev(CDEV_MAJOR, DCONS_GDB); 577 #endif 578 gdb_getc = dcons_cngetc; 579 gdb_putc = dcons_cnputc; 580 #endif 581 #endif 582 drv_init = 1; 583 584 return 0; 585 } 586 587 588 static int 589 dcons_attach_port(int port, char *name, int flags) 590 { 591 struct dcons_softc *dc; 592 struct tty *tp; 593 DEV dev; 594 595 dc = &sc[port]; 596 dc->flags = flags; 597 dev = make_dev(&dcons_cdevsw, port, 598 UID_ROOT, GID_WHEEL, 0600, name); 599 dc->dev = (void *)dev; 600 tp = ttyalloc(); 601 602 dev->si_drv1 = (void *)dc; 603 dev->si_tty = tp; 604 605 tp->t_oproc = dcons_tty_start; 606 tp->t_param = dcons_tty_param; 607 tp->t_stop = nottystop; 608 tp->t_dev = dc->dev; 609 610 return(0); 611 } 612 613 static int 614 dcons_attach(void) 615 { 616 int polltime; 617 618 #ifdef __DragonFly__ 619 cdevsw_add(&dcons_cdevsw, -1, 0); 620 #endif 621 dcons_attach_port(DCONS_CON, "dcons", 0); 622 dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB); 623 #if __FreeBSD_version < 500000 624 callout_init(&dcons_callout); 625 #else 626 callout_init(&dcons_callout, 0); 627 #endif 628 polltime = hz / poll_hz; 629 if (polltime < 1) 630 polltime = 1; 631 callout_reset(&dcons_callout, polltime, dcons_timeout, NULL); 632 return(0); 633 } 634 635 static int 636 dcons_detach(int port) 637 { 638 struct tty *tp; 639 struct dcons_softc *dc; 640 641 dc = &sc[port]; 642 643 tp = ((DEV)dc->dev)->si_tty; 644 645 if (tp->t_state & TS_ISOPEN) { 646 printf("dcons: still opened\n"); 647 #if __FreeBSD_version < 502113 648 (*linesw[tp->t_line].l_close)(tp, 0); 649 tp->t_gen++; 650 ttyclose(tp); 651 ttwakeup(tp); 652 ttwwakeup(tp); 653 #else 654 ttyld_close(tp, 0); 655 tty_close(tp); 656 #endif 657 } 658 /* XXX 659 * must wait until all device are closed. 660 */ 661 #ifdef __DragonFly__ 662 tsleep((void *)dc, 0, "dcodtc", hz/4); 663 #else 664 tsleep((void *)dc, PWAIT, "dcodtc", hz/4); 665 #endif 666 destroy_dev(dc->dev); 667 668 return(0); 669 } 670 671 672 /* cnXXX works only for FreeBSD-5 */ 673 static int 674 dcons_modevent(module_t mode, int type, void *data) 675 { 676 int err = 0, ret; 677 678 switch (type) { 679 case MOD_LOAD: 680 ret = dcons_drv_init(1); 681 dcons_attach(); 682 #if __FreeBSD_version >= 500000 683 if (ret == 0) { 684 dcons_cnprobe(&dcons_consdev); 685 dcons_cninit(&dcons_consdev); 686 cnadd(&dcons_consdev); 687 } 688 #endif 689 break; 690 case MOD_UNLOAD: 691 printf("dcons: unload\n"); 692 callout_stop(&dcons_callout); 693 #if __FreeBSD_version < 502122 694 #if defined(DDB) && DCONS_FORCE_GDB 695 #if CONS_NODEV 696 gdb_arg = NULL; 697 #else 698 gdbdev = NULL; 699 #endif 700 #endif 701 #endif 702 #if __FreeBSD_version >= 500000 703 cnremove(&dcons_consdev); 704 #endif 705 dcons_detach(DCONS_CON); 706 dcons_detach(DCONS_GDB); 707 dg.buf->magic = 0; 708 709 contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF); 710 711 break; 712 case MOD_SHUTDOWN: 713 #if 0 /* Keep connection after halt */ 714 dg.buf->magic = 0; 715 #endif 716 break; 717 default: 718 err = EOPNOTSUPP; 719 break; 720 } 721 return(err); 722 } 723 724 #if defined(GDB) && (__FreeBSD_version >= 502122) 725 /* Debugger interface */ 726 727 static int 728 dcons_dbg_probe(void) 729 { 730 int dcons_gdb; 731 732 if (getenv_int("dcons_gdb", &dcons_gdb) == 0) 733 return (-1); 734 return (dcons_gdb); 735 } 736 737 static void 738 dcons_dbg_init(void) 739 { 740 } 741 742 static void 743 dcons_dbg_term(void) 744 { 745 } 746 747 static void 748 dcons_dbg_putc(int c) 749 { 750 struct dcons_softc *dc = &sc[DCONS_GDB]; 751 dcons_os_putc(dc, c); 752 } 753 754 static int 755 dcons_dbg_getc(void) 756 { 757 struct dcons_softc *dc = &sc[DCONS_GDB]; 758 return (dcons_os_getc(dc)); 759 } 760 #endif 761 762 DEV_MODULE(dcons, dcons_modevent, NULL); 763 MODULE_VERSION(dcons, DCONS_VERSION); 764