dcons_os.c revision 178771
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: head/sys/dev/dcons/dcons_os.c 178771 2008-05-05 08:25:46Z peter $ 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 100static struct consdev gdbconsdev; 101#endif 102#endif 103 104static d_open_t dcons_open; 105static d_close_t dcons_close; 106#if defined(__DragonFly__) || __FreeBSD_version < 500104 107static d_ioctl_t dcons_ioctl; 108#endif 109 110static 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 141static char bssbuf[DCONS_BUF_SIZE]; /* buf in bss */ 142#endif 143 144/* global data */ 145static struct dcons_global dg; 146struct dcons_global *dcons_conf; 147static int poll_hz = DCONS_POLL_HZ; 148 149static struct dcons_softc sc[DCONS_NPORT]; 150 151SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console"); 152SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0, 153 "dcons polling rate"); 154 155static int drv_init = 0; 156static struct callout dcons_callout; 157struct 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 171static void dcons_tty_start(struct tty *); 172static int dcons_tty_param(struct tty *, struct termios *); 173static void dcons_timeout(void *); 174static int dcons_drv_init(int); 175 176static cn_probe_t dcons_cnprobe; 177static cn_init_t dcons_cninit; 178static cn_term_t dcons_cnterm; 179static cn_getc_t dcons_cngetc; 180static cn_putc_t dcons_cnputc; 181 182CONSOLE_DRIVER(dcons); 183 184#if defined(GDB) && (__FreeBSD_version >= 502122) 185static gdb_probe_f dcons_dbg_probe; 186static gdb_init_f dcons_dbg_init; 187static gdb_term_f dcons_dbg_term; 188static gdb_getc_f dcons_dbg_getc; 189static gdb_putc_f dcons_dbg_putc; 190 191GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term, 192 dcons_dbg_getc, dcons_dbg_putc); 193 194extern struct gdb_dbgport *gdb_cur; 195#endif 196 197#if (defined(GDB) || defined(DDB)) && defined(ALT_BREAK_TO_DEBUGGER) 198static int 199dcons_check_break(struct dcons_softc *dc, int c) 200{ 201#if __FreeBSD_version >= 502122 202 int kdb_brk; 203#endif 204 if (c < 0) 205 return (c); 206 207#if __FreeBSD_version >= 502122 208 if ((kdb_brk = kdb_alt_break(c, &dc->brk_state)) != 0) { 209 switch (kdb_brk) { 210 case KDB_REQ_DEBUGGER: 211 212 if ((dc->flags & DC_GDB) != 0) { 213#ifdef GDB 214 if (gdb_cur == &dcons_gdb_dbgport) { 215 kdb_dbbe_select("gdb"); 216 kdb_enter(KDB_WHY_BREAK, 217 "Break sequence on dcons gdb port"); 218 } 219#endif 220 } else 221 kdb_enter(KDB_WHY_BREAK, 222 "Break sequence on dcons console port"); 223 break; 224 case KDB_REQ_PANIC: 225 kdb_panic("Panic sequence on dcons console port"); 226 break; 227 case KDB_REQ_REBOOT: 228 kdb_reboot(); 229 break; 230 } 231 } 232#else 233 switch (dc->brk_state) { 234 case STATE1: 235 if (c == KEY_TILDE) 236 dc->brk_state = STATE2; 237 else 238 dc->brk_state = STATE0; 239 break; 240 case STATE2: 241 dc->brk_state = STATE0; 242 if (c == KEY_CTRLB) { 243#if DCONS_FORCE_GDB 244 if (dc->flags & DC_GDB) 245 boothowto |= RB_GDB; 246#endif 247 breakpoint(); 248 } 249 } 250 if (c == KEY_CR) 251 dc->brk_state = STATE1; 252#endif 253 return (c); 254} 255#else 256#define dcons_check_break(dc, c) (c) 257#endif 258 259static int 260dcons_os_checkc_nopoll(struct dcons_softc *dc) 261{ 262 int c; 263 264 if (dg.dma_tag != NULL) 265 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD); 266 267 c = dcons_check_break(dc, dcons_checkc(dc)); 268 269 if (dg.dma_tag != NULL) 270 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD); 271 272 return (c); 273} 274 275static int 276dcons_os_checkc(struct dcons_softc *dc) 277{ 278 EVENTHANDLER_INVOKE(dcons_poll, 0); 279 return (dcons_os_checkc_nopoll(dc)); 280} 281 282#if defined(GDB) || !defined(CONS_NODEV) 283static int 284dcons_os_getc(struct dcons_softc *dc) 285{ 286 int c; 287 288 while ((c = dcons_os_checkc(dc)) == -1); 289 290 return (c & 0xff); 291} 292#endif 293 294static void 295dcons_os_putc(struct dcons_softc *dc, int c) 296{ 297 if (dg.dma_tag != NULL) 298 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE); 299 300 dcons_putc(dc, c); 301 302 if (dg.dma_tag != NULL) 303 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE); 304} 305static int 306dcons_open(DEV dev, int flag, int mode, THREAD *td) 307{ 308 struct tty *tp; 309 int unit, error, s; 310 311 unit = minor(dev); 312 if (unit != 0) 313 return (ENXIO); 314 315 tp = dev->si_tty; 316 tp->t_oproc = dcons_tty_start; 317 tp->t_param = dcons_tty_param; 318 tp->t_stop = nottystop; 319 tp->t_dev = dev; 320 321 error = 0; 322 323 s = spltty(); 324 if ((tp->t_state & TS_ISOPEN) == 0) { 325 tp->t_state |= TS_CARR_ON; 326 ttyconsolemode(tp, 0); 327 } else if ((tp->t_state & TS_XCLUDE) && 328 priv_check(td, PRIV_TTY_EXCLUSIVE)) { 329 splx(s); 330 return (EBUSY); 331 } 332 splx(s); 333 334#if __FreeBSD_version < 502113 335 error = (*linesw[tp->t_line].l_open)(dev, tp); 336#else 337 error = ttyld_open(tp, dev); 338#endif 339 340 return (error); 341} 342 343static int 344dcons_close(DEV dev, int flag, int mode, THREAD *td) 345{ 346 int unit; 347 struct tty *tp; 348 349 unit = minor(dev); 350 if (unit != 0) 351 return (ENXIO); 352 353 tp = dev->si_tty; 354 if (tp->t_state & TS_ISOPEN) { 355#if __FreeBSD_version < 502113 356 (*linesw[tp->t_line].l_close)(tp, flag); 357 ttyclose(tp); 358#else 359 ttyld_close(tp, flag); 360 tty_close(tp); 361#endif 362 } 363 364 return (0); 365} 366 367#if defined(__DragonFly__) || __FreeBSD_version < 500104 368static int 369dcons_ioctl(DEV dev, u_long cmd, caddr_t data, int flag, THREAD *td) 370{ 371 int unit; 372 struct tty *tp; 373 int error; 374 375 unit = minor(dev); 376 if (unit != 0) 377 return (ENXIO); 378 379 tp = dev->si_tty; 380 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td); 381 if (error != ENOIOCTL) 382 return (error); 383 384 error = ttioctl(tp, cmd, data, flag); 385 if (error != ENOIOCTL) 386 return (error); 387 388 return (ENOTTY); 389} 390#endif 391 392static int 393dcons_tty_param(struct tty *tp, struct termios *t) 394{ 395 tp->t_ispeed = t->c_ispeed; 396 tp->t_ospeed = t->c_ospeed; 397 tp->t_cflag = t->c_cflag; 398 return 0; 399} 400 401static void 402dcons_tty_start(struct tty *tp) 403{ 404 struct dcons_softc *dc; 405 int s; 406 407 dc = (struct dcons_softc *)tp->t_dev->si_drv1; 408 s = spltty(); 409 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) { 410 ttwwakeup(tp); 411 return; 412 } 413 414 tp->t_state |= TS_BUSY; 415 while (tp->t_outq.c_cc != 0) 416 dcons_os_putc(dc, getc(&tp->t_outq)); 417 tp->t_state &= ~TS_BUSY; 418 419 ttwwakeup(tp); 420 splx(s); 421} 422 423static void 424dcons_timeout(void *v) 425{ 426 struct tty *tp; 427 struct dcons_softc *dc; 428 int i, c, polltime; 429 430 for (i = 0; i < DCONS_NPORT; i ++) { 431 dc = &sc[i]; 432 tp = ((DEV)dc->dev)->si_tty; 433 while ((c = dcons_os_checkc_nopoll(dc)) != -1) 434 if (tp->t_state & TS_ISOPEN) 435#if __FreeBSD_version < 502113 436 (*linesw[tp->t_line].l_rint)(c, tp); 437#else 438 ttyld_rint(tp, c); 439#endif 440 } 441 polltime = hz / poll_hz; 442 if (polltime < 1) 443 polltime = 1; 444 callout_reset(&dcons_callout, polltime, dcons_timeout, tp); 445} 446 447static void 448dcons_cnprobe(struct consdev *cp) 449{ 450#ifdef __DragonFly__ 451 cp->cn_dev = make_dev(&dcons_cdevsw, DCONS_CON, 452 UID_ROOT, GID_WHEEL, 0600, "dcons"); 453#elif __FreeBSD_version >= 501109 454 sprintf(cp->cn_name, "dcons"); 455#else 456 cp->cn_dev = makedev(CDEV_MAJOR, DCONS_CON); 457#endif 458#if DCONS_FORCE_CONSOLE 459 cp->cn_pri = CN_REMOTE; 460#else 461 cp->cn_pri = CN_NORMAL; 462#endif 463} 464 465static void 466dcons_cninit(struct consdev *cp) 467{ 468 dcons_drv_init(0); 469#if CONS_NODEV 470 cp->cn_arg 471#else 472 cp->cn_dev->si_drv1 473#endif 474 = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */ 475} 476 477static void 478dcons_cnterm(struct consdev *cp) 479{ 480} 481 482#if CONS_NODEV 483static int 484dcons_cngetc(struct consdev *cp) 485{ 486 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 487 return (dcons_os_checkc(dc)); 488} 489static void 490dcons_cnputc(struct consdev *cp, int c) 491{ 492 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 493 dcons_os_putc(dc, c); 494} 495#else 496static int 497dcons_cngetc(DEV dev) 498{ 499 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 500 return (dcons_os_getc(dc)); 501} 502static int 503dcons_cncheckc(DEV dev) 504{ 505 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 506 return (dcons_os_checkc(dc)); 507} 508static void 509dcons_cnputc(DEV dev, int c) 510{ 511 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 512 dcons_os_putc(dc, c); 513} 514#endif 515 516static int 517dcons_drv_init(int stage) 518{ 519#if defined(__i386__) || defined(__amd64__) 520 quad_t addr, size; 521#endif 522 523 if (drv_init) 524 return(drv_init); 525 526 drv_init = -1; 527 528 bzero(&dg, sizeof(dg)); 529 dcons_conf = &dg; 530 dg.cdev = &dcons_consdev; 531 dg.buf = NULL; 532 dg.size = DCONS_BUF_SIZE; 533 534#if defined(__i386__) || defined(__amd64__) 535 if (getenv_quad("dcons.addr", &addr) > 0 && 536 getenv_quad("dcons.size", &size) > 0) { 537#ifdef __i386__ 538 vm_paddr_t pa; 539 /* 540 * Allow read/write access to dcons buffer. 541 */ 542 for (pa = trunc_page(addr); pa < addr + size; pa += PAGE_SIZE) 543 *vtopte(KERNBASE + pa) |= PG_RW; 544 invltlb(); 545#endif 546 /* XXX P to V */ 547 dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr); 548 dg.size = size; 549 if (dcons_load_buffer(dg.buf, dg.size, sc) < 0) 550 dg.buf = NULL; 551 } 552#endif 553 if (dg.buf != NULL) 554 goto ok; 555 556#ifndef KLD_MODULE 557 if (stage == 0) { /* XXX or cold */ 558 /* 559 * DCONS_FORCE_CONSOLE == 1 and statically linked. 560 * called from cninit(). can't use contigmalloc yet . 561 */ 562 dg.buf = (struct dcons_buf *) bssbuf; 563 dcons_init(dg.buf, dg.size, sc); 564 } else 565#endif 566 { 567 /* 568 * DCONS_FORCE_CONSOLE == 0 or kernel module case. 569 * if the module is loaded after boot, 570 * bssbuf could be non-continuous. 571 */ 572 dg.buf = (struct dcons_buf *) contigmalloc(dg.size, 573 M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul); 574 dcons_init(dg.buf, dg.size, sc); 575 } 576 577ok: 578 dcons_buf = dg.buf; 579 580#if __FreeBSD_version < 502122 581#if defined(DDB) && DCONS_FORCE_GDB 582#if CONS_NODEV 583 gdbconsdev.cn_arg = (void *)&sc[DCONS_GDB]; 584#if __FreeBSD_version >= 501109 585 sprintf(gdbconsdev.cn_name, "dgdb"); 586#endif 587 gdb_arg = &gdbconsdev; 588#elif defined(__DragonFly__) 589 gdbdev = make_dev(&dcons_cdevsw, DCONS_GDB, 590 UID_ROOT, GID_WHEEL, 0600, "dgdb"); 591#else 592 gdbdev = makedev(CDEV_MAJOR, DCONS_GDB); 593#endif 594 gdb_getc = dcons_cngetc; 595 gdb_putc = dcons_cnputc; 596#endif 597#endif 598 drv_init = 1; 599 600 return 0; 601} 602 603 604static int 605dcons_attach_port(int port, char *name, int flags) 606{ 607 struct dcons_softc *dc; 608 struct tty *tp; 609 DEV dev; 610 611 dc = &sc[port]; 612 dc->flags = flags; 613 dev = make_dev(&dcons_cdevsw, port, 614 UID_ROOT, GID_WHEEL, 0600, name); 615 dc->dev = (void *)dev; 616 tp = ttyalloc(); 617 618 dev->si_drv1 = (void *)dc; 619 dev->si_tty = tp; 620 621 tp->t_oproc = dcons_tty_start; 622 tp->t_param = dcons_tty_param; 623 tp->t_stop = nottystop; 624 tp->t_dev = dc->dev; 625 626 return(0); 627} 628 629static int 630dcons_attach(void) 631{ 632 int polltime; 633 634#ifdef __DragonFly__ 635 cdevsw_add(&dcons_cdevsw, -1, 0); 636#endif 637 dcons_attach_port(DCONS_CON, "dcons", 0); 638 dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB); 639#if __FreeBSD_version < 500000 640 callout_init(&dcons_callout); 641#else 642 callout_init(&dcons_callout, 0); 643#endif 644 polltime = hz / poll_hz; 645 if (polltime < 1) 646 polltime = 1; 647 callout_reset(&dcons_callout, polltime, dcons_timeout, NULL); 648 return(0); 649} 650 651static int 652dcons_detach(int port) 653{ 654 struct tty *tp; 655 struct dcons_softc *dc; 656 657 dc = &sc[port]; 658 659 tp = ((DEV)dc->dev)->si_tty; 660 661 if (tp->t_state & TS_ISOPEN) { 662 printf("dcons: still opened\n"); 663#if __FreeBSD_version < 502113 664 (*linesw[tp->t_line].l_close)(tp, 0); 665 tp->t_gen++; 666 ttyclose(tp); 667 ttwakeup(tp); 668 ttwwakeup(tp); 669#else 670 ttyld_close(tp, 0); 671 tty_close(tp); 672#endif 673 } 674 /* XXX 675 * must wait until all device are closed. 676 */ 677#ifdef __DragonFly__ 678 tsleep((void *)dc, 0, "dcodtc", hz/4); 679#else 680 tsleep((void *)dc, PWAIT, "dcodtc", hz/4); 681#endif 682 destroy_dev(dc->dev); 683 684 return(0); 685} 686 687 688/* cnXXX works only for FreeBSD-5 */ 689static int 690dcons_modevent(module_t mode, int type, void *data) 691{ 692 int err = 0, ret; 693 694 switch (type) { 695 case MOD_LOAD: 696 ret = dcons_drv_init(1); 697 dcons_attach(); 698#if __FreeBSD_version >= 500000 699 if (ret == 0) { 700 dcons_cnprobe(&dcons_consdev); 701 dcons_cninit(&dcons_consdev); 702 cnadd(&dcons_consdev); 703 } 704#endif 705 break; 706 case MOD_UNLOAD: 707 printf("dcons: unload\n"); 708 callout_stop(&dcons_callout); 709#if __FreeBSD_version < 502122 710#if defined(DDB) && DCONS_FORCE_GDB 711#if CONS_NODEV 712 gdb_arg = NULL; 713#else 714 gdbdev = NULL; 715#endif 716#endif 717#endif 718#if __FreeBSD_version >= 500000 719 cnremove(&dcons_consdev); 720#endif 721 dcons_detach(DCONS_CON); 722 dcons_detach(DCONS_GDB); 723 dg.buf->magic = 0; 724 725 contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF); 726 727 break; 728 case MOD_SHUTDOWN: 729#if 0 /* Keep connection after halt */ 730 dg.buf->magic = 0; 731#endif 732 break; 733 default: 734 err = EOPNOTSUPP; 735 break; 736 } 737 return(err); 738} 739 740#if defined(GDB) && (__FreeBSD_version >= 502122) 741/* Debugger interface */ 742 743static int 744dcons_dbg_probe(void) 745{ 746 int dcons_gdb; 747 748 if (getenv_int("dcons_gdb", &dcons_gdb) == 0) 749 return (-1); 750 return (dcons_gdb); 751} 752 753static void 754dcons_dbg_init(void) 755{ 756} 757 758static void 759dcons_dbg_term(void) 760{ 761} 762 763static void 764dcons_dbg_putc(int c) 765{ 766 struct dcons_softc *dc = &sc[DCONS_GDB]; 767 dcons_os_putc(dc, c); 768} 769 770static int 771dcons_dbg_getc(void) 772{ 773 struct dcons_softc *dc = &sc[DCONS_GDB]; 774 return (dcons_os_getc(dc)); 775} 776#endif 777 778DEV_MODULE(dcons, dcons_modevent, NULL); 779MODULE_VERSION(dcons, DCONS_VERSION); 780