1 /* 2 * (MPSAFE) 3 * 4 * Copyright (C) 2003,2004 5 * Hidetoshi Shimokawa. 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * 18 * This product includes software developed by Hidetoshi Shimokawa. 19 * 20 * 4. Neither the name of the author nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $FreeBSD: src/sys/dev/dcons/dcons_os.c,v 1.4 2004/10/24 12:41:04 simokawa Exp $ 37 */ 38 39 #include <sys/param.h> 40 #if __FreeBSD_version >= 502122 41 #include <sys/kdb.h> 42 #include <gdb/gdb.h> 43 #endif 44 #include <sys/kernel.h> 45 #include <sys/module.h> 46 #include <sys/systm.h> 47 #include <sys/types.h> 48 #include <sys/conf.h> 49 #include <sys/cons.h> 50 #include <sys/consio.h> 51 #include <sys/tty.h> 52 #include <sys/malloc.h> 53 #include <sys/proc.h> 54 #include <sys/priv.h> 55 #include <sys/thread2.h> 56 #include <sys/ucred.h> 57 #include <sys/bus.h> 58 59 #include "dcons.h" 60 #include "dcons_os.h" 61 62 #include <ddb/ddb.h> 63 #include <sys/reboot.h> 64 65 #include <sys/sysctl.h> 66 67 #include <vm/vm.h> 68 #include <vm/vm_param.h> 69 #include <vm/pmap.h> 70 71 #include "opt_ddb.h" 72 #include "opt_comconsole.h" 73 #include "opt_dcons.h" 74 75 #ifndef DCONS_POLL_HZ 76 #define DCONS_POLL_HZ 100 77 #endif 78 79 #ifndef DCONS_BUF_SIZE 80 #define DCONS_BUF_SIZE (16*1024) 81 #endif 82 83 #ifndef DCONS_FORCE_CONSOLE 84 #define DCONS_FORCE_CONSOLE 0 /* Mostly for FreeBSD-4/DragonFly */ 85 #endif 86 87 #ifndef DCONS_FORCE_GDB 88 #define DCONS_FORCE_GDB 1 89 #endif 90 91 static d_open_t dcons_open; 92 static d_close_t dcons_close; 93 static d_ioctl_t dcons_ioctl; 94 95 static struct dev_ops dcons_ops = { 96 { "dcons", 0, D_TTY }, 97 .d_open = dcons_open, 98 .d_close = dcons_close, 99 .d_read = ttyread, 100 .d_write = ttywrite, 101 .d_ioctl = dcons_ioctl, 102 .d_kqfilter = ttykqfilter, 103 .d_revoke = ttyrevoke 104 }; 105 106 #ifndef KLD_MODULE 107 static char bssbuf[DCONS_BUF_SIZE]; /* buf in bss */ 108 #endif 109 110 /* global data */ 111 static struct dcons_global dg; 112 struct dcons_global *dcons_conf; 113 static int poll_hz = DCONS_POLL_HZ; 114 115 static struct dcons_softc sc[DCONS_NPORT]; 116 117 SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console"); 118 SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0, 119 "dcons polling rate"); 120 121 static int drv_init = 0; 122 static struct callout dcons_callout; 123 struct dcons_buf *dcons_buf; /* for local dconschat */ 124 125 #ifdef __DragonFly__ 126 #define DEV cdev_t 127 #define THREAD d_thread_t 128 #elif __FreeBSD_version < 500000 129 #define DEV cdev_t 130 #define THREAD struct proc 131 #else 132 #define DEV struct cdev * 133 #define THREAD struct thread 134 #endif 135 136 137 static void dcons_tty_start(struct tty *); 138 static int dcons_tty_param(struct tty *, struct termios *); 139 static void dcons_timeout(void *); 140 static int dcons_drv_init(int); 141 142 static cn_probe_t dcons_cnprobe; 143 static cn_init_t dcons_cninit; 144 static cn_init_fini_t dcons_cninit_fini; 145 static cn_getc_t dcons_cngetc; 146 static cn_checkc_t dcons_cncheckc; 147 static cn_putc_t dcons_cnputc; 148 149 CONS_DRIVER(dcons, dcons_cnprobe, dcons_cninit, dcons_cninit_fini, 150 NULL, dcons_cngetc, dcons_cncheckc, dcons_cnputc, NULL, NULL); 151 152 #if __FreeBSD_version >= 502122 153 static gdb_probe_f dcons_dbg_probe; 154 static gdb_init_f dcons_dbg_init; 155 static gdb_term_f dcons_dbg_term; 156 static gdb_getc_f dcons_dbg_getc; 157 static gdb_checkc_f dcons_dbg_checkc; 158 static gdb_putc_f dcons_dbg_putc; 159 160 GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term, 161 dcons_dbg_checkc, dcons_dbg_getc, dcons_dbg_putc); 162 163 extern struct gdb_dbgport *gdb_cur; 164 #endif 165 166 #if (KDB || DDB) && ALT_BREAK_TO_DEBUGGER 167 static int 168 dcons_check_break(struct dcons_softc *dc, int c) 169 { 170 if (c < 0) 171 return (c); 172 173 lwkt_gettoken(&tty_token); 174 #if __FreeBSD_version >= 502122 175 if (kdb_alt_break(c, &dc->brk_state)) { 176 if ((dc->flags & DC_GDB) != 0) { 177 if (gdb_cur == &dcons_gdb_dbgport) { 178 kdb_dbbe_select("gdb"); 179 breakpoint(); 180 } 181 } else 182 breakpoint(); 183 } 184 #else 185 switch (dc->brk_state) { 186 case STATE1: 187 if (c == KEY_TILDE) 188 dc->brk_state = STATE2; 189 else 190 dc->brk_state = STATE0; 191 break; 192 case STATE2: 193 dc->brk_state = STATE0; 194 if (c == KEY_CTRLB) { 195 #if DCONS_FORCE_GDB 196 if (dc->flags & DC_GDB) 197 boothowto |= RB_GDB; 198 #endif 199 breakpoint(); 200 } 201 } 202 if (c == KEY_CR) 203 dc->brk_state = STATE1; 204 #endif 205 lwkt_reltoken(&tty_token); 206 return (c); 207 } 208 #else 209 #define dcons_check_break(dc, c) (c) 210 #endif 211 212 static int 213 dcons_os_checkc(struct dcons_softc *dc) 214 { 215 int c; 216 217 lwkt_gettoken(&tty_token); 218 if (dg.dma_tag != NULL) 219 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD); 220 221 c = dcons_check_break(dc, dcons_checkc(dc)); 222 223 if (dg.dma_tag != NULL) 224 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD); 225 226 lwkt_reltoken(&tty_token); 227 return (c); 228 } 229 230 static int 231 dcons_os_getc(struct dcons_softc *dc) 232 { 233 int c; 234 235 while ((c = dcons_os_checkc(dc)) == -1); 236 237 return (c & 0xff); 238 } 239 240 static void 241 dcons_os_putc(struct dcons_softc *dc, int c) 242 { 243 if (dg.dma_tag != NULL) 244 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE); 245 246 dcons_putc(dc, c); 247 248 if (dg.dma_tag != NULL) 249 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE); 250 } 251 static int 252 dcons_open(struct dev_open_args *ap) 253 { 254 cdev_t dev = ap->a_head.a_dev; 255 struct tty *tp; 256 int unit, error; 257 258 unit = minor(dev); 259 if (unit != 0) 260 return (ENXIO); 261 262 lwkt_gettoken(&tty_token); 263 tp = dev->si_tty = ttymalloc(dev->si_tty); 264 tp->t_oproc = dcons_tty_start; 265 tp->t_param = dcons_tty_param; 266 tp->t_stop = nottystop; 267 tp->t_dev = dev; 268 269 error = 0; 270 271 crit_enter(); 272 if ((tp->t_state & TS_ISOPEN) == 0) { 273 tp->t_state |= TS_CARR_ON; 274 ttychars(tp); 275 tp->t_iflag = TTYDEF_IFLAG; 276 tp->t_oflag = TTYDEF_OFLAG; 277 tp->t_cflag = TTYDEF_CFLAG|CLOCAL; 278 tp->t_lflag = TTYDEF_LFLAG; 279 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 280 ttsetwater(tp); 281 } else if ((tp->t_state & TS_XCLUDE) && priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) { 282 crit_exit(); 283 lwkt_reltoken(&tty_token); 284 return (EBUSY); 285 } 286 crit_exit(); 287 288 #if __FreeBSD_version < 502113 289 error = (*linesw[tp->t_line].l_open)(dev, tp); 290 #else 291 error = ttyld_open(tp, dev); 292 #endif 293 lwkt_reltoken(&tty_token); 294 return (error); 295 } 296 297 static int 298 dcons_close(struct dev_close_args *ap) 299 { 300 cdev_t dev = ap->a_head.a_dev; 301 int unit; 302 struct tty *tp; 303 304 unit = minor(dev); 305 if (unit != 0) 306 return (ENXIO); 307 308 lwkt_gettoken(&tty_token); 309 tp = dev->si_tty; 310 if (tp->t_state & TS_ISOPEN) { 311 (*linesw[tp->t_line].l_close)(tp, ap->a_fflag); 312 ttyclose(tp); 313 } 314 lwkt_reltoken(&tty_token); 315 316 return (0); 317 } 318 319 static int 320 dcons_ioctl(struct dev_ioctl_args *ap) 321 { 322 cdev_t dev = ap->a_head.a_dev; 323 int unit; 324 struct tty *tp; 325 int error; 326 327 unit = minor(dev); 328 if (unit != 0) 329 return (ENXIO); 330 331 lwkt_gettoken(&tty_token); 332 tp = dev->si_tty; 333 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data, ap->a_fflag, ap->a_cred); 334 if (error != ENOIOCTL) { 335 lwkt_reltoken(&tty_token); 336 return (error); 337 } 338 339 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag); 340 if (error != ENOIOCTL) { 341 lwkt_reltoken(&tty_token); 342 return (error); 343 } 344 345 lwkt_reltoken(&tty_token); 346 return (ENOTTY); 347 } 348 349 static int 350 dcons_tty_param(struct tty *tp, struct termios *t) 351 { 352 lwkt_gettoken(&tty_token); 353 tp->t_ispeed = t->c_ispeed; 354 tp->t_ospeed = t->c_ospeed; 355 tp->t_cflag = t->c_cflag; 356 lwkt_reltoken(&tty_token); 357 return 0; 358 } 359 360 static void 361 dcons_tty_start(struct tty *tp) 362 { 363 struct dcons_softc *dc; 364 365 lwkt_gettoken(&tty_token); 366 dc = (struct dcons_softc *)tp->t_dev->si_drv1; 367 crit_enter(); 368 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) { 369 ttwwakeup(tp); 370 crit_exit(); 371 lwkt_reltoken(&tty_token); 372 return; 373 } 374 375 tp->t_state |= TS_BUSY; 376 while (tp->t_outq.c_cc != 0) 377 dcons_os_putc(dc, clist_getc(&tp->t_outq)); 378 tp->t_state &= ~TS_BUSY; 379 380 ttwwakeup(tp); 381 crit_exit(); 382 lwkt_reltoken(&tty_token); 383 } 384 385 static void 386 dcons_timeout(void *v) 387 { 388 struct tty *tp; 389 struct dcons_softc *dc; 390 int i, c, polltime; 391 392 lwkt_gettoken(&tty_token); 393 for (i = 0; i < DCONS_NPORT; i ++) { 394 dc = &sc[i]; 395 tp = ((DEV)dc->dev)->si_tty; 396 while ((c = dcons_os_checkc(dc)) != -1) 397 if (tp->t_state & TS_ISOPEN) 398 #if __FreeBSD_version < 502113 399 (*linesw[tp->t_line].l_rint)(c, tp); 400 #else 401 ttyld_rint(tp, c); 402 #endif 403 } 404 polltime = hz / poll_hz; 405 if (polltime < 1) 406 polltime = 1; 407 callout_reset(&dcons_callout, polltime, dcons_timeout, tp); 408 lwkt_reltoken(&tty_token); 409 } 410 411 static void 412 dcons_cnprobe(struct consdev *cp) 413 { 414 #ifdef __DragonFly__ 415 cp->cn_probegood = 1; 416 #elif __FreeBSD_version >= 501109 417 ksprintf(cp->cn_name, "dcons"); 418 #else 419 cp->cn_dev = makedev(CDEV_MAJOR, DCONS_CON); 420 #endif 421 #if DCONS_FORCE_CONSOLE 422 cp->cn_pri = CN_REMOTE; 423 #else 424 cp->cn_pri = CN_NORMAL; 425 #endif 426 } 427 428 static void 429 dcons_cninit(struct consdev *cp) 430 { 431 dcons_drv_init(0); 432 #if CONS_NODEV 433 cp->cn_arg 434 #else 435 cp->cn_private 436 #endif 437 = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */ 438 } 439 440 static void 441 dcons_cninit_fini(struct consdev *cp) 442 { 443 cp->cn_dev = make_dev(&dcons_ops, DCONS_CON, 444 UID_ROOT, GID_WHEEL, 0600, "dcons"); 445 } 446 447 #if CONS_NODEV 448 static int 449 dcons_cngetc(struct consdev *cp) 450 { 451 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 452 return (dcons_os_getc(dc)); 453 } 454 static int 455 dcons_cncheckc(struct consdev *cp) 456 { 457 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 458 return (dcons_os_checkc(dc)); 459 } 460 static void 461 dcons_cnputc(struct consdev *cp, int c) 462 { 463 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 464 dcons_os_putc(dc, c); 465 } 466 #else 467 static int 468 dcons_cngetc(void *private) 469 { 470 struct dcons_softc *dc = (struct dcons_softc *)private; 471 return (dcons_os_getc(dc)); 472 } 473 static int 474 dcons_cncheckc(void *private) 475 { 476 struct dcons_softc *dc = (struct dcons_softc *)private; 477 return (dcons_os_checkc(dc)); 478 } 479 static void 480 dcons_cnputc(void *private, int c) 481 { 482 struct dcons_softc *dc = (struct dcons_softc *)private; 483 dcons_os_putc(dc, c); 484 } 485 #endif 486 487 static int 488 dcons_drv_init(int stage) 489 { 490 #ifdef __i386__ 491 quad_t addr, size; 492 #endif 493 494 if (drv_init) 495 return(drv_init); 496 497 drv_init = -1; 498 499 bzero(&dg, sizeof(dg)); 500 dcons_conf = &dg; 501 dg.cdev = &dcons_consdev; 502 dg.buf = NULL; 503 dg.size = DCONS_BUF_SIZE; 504 505 #ifdef __i386__ 506 if (kgetenv_quad("dcons.addr", &addr) > 0 && 507 kgetenv_quad("dcons.size", &size) > 0) { 508 vm_paddr_t pa; 509 /* 510 * Allow read/write access to dcons buffer. 511 */ 512 for (pa = trunc_page(addr); pa < addr + size; pa += PAGE_SIZE) 513 pmap_kmodify_rw((vm_offset_t)(KERNBASE + pa)); 514 cpu_invltlb(); 515 /* XXX P to V */ 516 dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr); 517 dg.size = size; 518 if (dcons_load_buffer(dg.buf, dg.size, sc) < 0) 519 dg.buf = NULL; 520 } 521 #endif 522 if (dg.buf != NULL) 523 goto ok; 524 525 #ifndef KLD_MODULE 526 if (stage == 0) { /* XXX or cold */ 527 /* 528 * DCONS_FORCE_CONSOLE == 1 and statically linked. 529 * called from cninit(). can't use contigmalloc yet . 530 */ 531 dg.buf = (struct dcons_buf *) bssbuf; 532 dcons_init(dg.buf, dg.size, sc); 533 } else 534 #endif 535 { 536 /* 537 * DCONS_FORCE_CONSOLE == 0 or kernel module case. 538 * if the module is loaded after boot, 539 * bssbuf could be non-continuous. 540 */ 541 dg.buf = (struct dcons_buf *) contigmalloc(dg.size, 542 M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul); 543 dcons_init(dg.buf, dg.size, sc); 544 } 545 546 ok: 547 dcons_buf = dg.buf; 548 549 #if DDB && DCONS_FORCE_GDB 550 if (gdb_tab == NULL) { 551 gdb_tab = &dcons_consdev; 552 dcons_consdev.cn_gdbprivate = &sc[DCONS_GDB]; 553 } 554 #endif 555 drv_init = 1; 556 557 return 0; 558 } 559 560 /* 561 * NOTE: Must be called with tty_token held 562 */ 563 static int 564 dcons_attach_port(int port, char *name, int flags) 565 { 566 struct dcons_softc *dc; 567 struct tty *tp; 568 DEV dev; 569 570 ASSERT_LWKT_TOKEN_HELD(&tty_token); 571 dc = &sc[port]; 572 dc->flags = flags; 573 dev = make_dev(&dcons_ops, port, UID_ROOT, GID_WHEEL, 0600, "%s", 574 name); 575 dc->dev = (void *)dev; 576 tp = ttymalloc(NULL); 577 578 dev->si_drv1 = (void *)dc; 579 dev->si_tty = tp; 580 581 tp->t_oproc = dcons_tty_start; 582 tp->t_param = dcons_tty_param; 583 tp->t_stop = nottystop; 584 tp->t_dev = dc->dev; 585 586 return(0); 587 } 588 589 /* 590 * NOTE: Must be called with tty_token held 591 */ 592 static int 593 dcons_attach(void) 594 { 595 int polltime; 596 597 ASSERT_LWKT_TOKEN_HELD(&tty_token); 598 dcons_attach_port(DCONS_CON, "dcons", 0); 599 dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB); 600 #if __FreeBSD_version < 500000 601 callout_init_mp(&dcons_callout); 602 #else 603 callout_init(&dcons_callout, 0); 604 #endif 605 polltime = hz / poll_hz; 606 if (polltime < 1) 607 polltime = 1; 608 callout_reset(&dcons_callout, polltime, dcons_timeout, NULL); 609 return(0); 610 } 611 612 /* 613 * NOTE: Must be called with tty_token held 614 */ 615 static int 616 dcons_detach(int port) 617 { 618 struct tty *tp; 619 struct dcons_softc *dc; 620 621 ASSERT_LWKT_TOKEN_HELD(&tty_token); 622 dc = &sc[port]; 623 624 tp = ((DEV)dc->dev)->si_tty; 625 626 if (tp->t_state & TS_ISOPEN) { 627 kprintf("dcons: still opened\n"); 628 #if __FreeBSD_version < 502113 629 (*linesw[tp->t_line].l_close)(tp, 0); 630 ttyclose(tp); 631 #else 632 ttyld_close(tp, 0); 633 tty_close(tp); 634 #endif 635 } 636 /* XXX 637 * must wait until all device are closed. 638 */ 639 #ifdef __DragonFly__ 640 tsleep((void *)dc, 0, "dcodtc", hz/4); 641 #else 642 tsleep((void *)dc, PWAIT, "dcodtc", hz/4); 643 #endif 644 destroy_dev(dc->dev); 645 646 return(0); 647 } 648 649 650 /* cnXXX works only for FreeBSD-5 */ 651 static int 652 dcons_modevent(module_t mode, int type, void *data) 653 { 654 int err = 0, ret; 655 656 lwkt_gettoken(&tty_token); 657 switch (type) { 658 case MOD_LOAD: 659 ret = dcons_drv_init(1); 660 dcons_attach(); 661 #if __FreeBSD_version >= 500000 662 if (ret == 0) { 663 dcons_cnprobe(&dcons_consdev); 664 dcons_cninit(&dcons_consdev); 665 cnadd(&dcons_consdev); 666 } 667 #endif 668 break; 669 case MOD_UNLOAD: 670 kprintf("dcons: unload\n"); 671 callout_stop(&dcons_callout); 672 #if __FreeBSD_version < 502122 673 #if DDB && DCONS_FORCE_GDB 674 #if CONS_NODEV 675 gdb_arg = NULL; 676 #else 677 if (gdb_tab == &dcons_consdev) 678 gdb_tab = NULL; 679 #endif 680 #endif 681 #endif 682 #if __FreeBSD_version >= 500000 683 cnremove(&dcons_consdev); 684 #endif 685 dcons_detach(DCONS_CON); 686 dcons_detach(DCONS_GDB); 687 dg.buf->magic = 0; 688 689 contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF); 690 691 break; 692 case MOD_SHUTDOWN: 693 dg.buf->magic = 0; 694 break; 695 default: 696 err = EOPNOTSUPP; 697 break; 698 } 699 lwkt_reltoken(&tty_token); 700 return(err); 701 } 702 703 #if __FreeBSD_version >= 502122 704 /* Debugger interface */ 705 706 static int 707 dcons_dbg_probe(void) 708 { 709 return(DCONS_FORCE_GDB); 710 } 711 712 static void 713 dcons_dbg_init(void) 714 { 715 } 716 717 static void 718 dcons_dbg_term(void) 719 { 720 } 721 722 static void 723 dcons_dbg_putc(int c) 724 { 725 struct dcons_softc *dc = &sc[DCONS_GDB]; 726 dcons_os_putc(dc, c); 727 } 728 729 static int 730 dcons_dbg_checkc(void) 731 { 732 struct dcons_softc *dc = &sc[DCONS_GDB]; 733 return (dcons_os_checkc(dc)); 734 } 735 736 static int 737 dcons_dbg_getc(void) 738 { 739 struct dcons_softc *dc = &sc[DCONS_GDB]; 740 return (dcons_os_getc(dc)); 741 } 742 #endif 743 744 DEV_MODULE(dcons, dcons_modevent, NULL); 745 MODULE_VERSION(dcons, DCONS_VERSION); 746