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/ttydefaults.h> /* for TTYDEF_* */ 53 #include <sys/malloc.h> 54 #include <sys/proc.h> 55 #include <sys/priv.h> 56 #include <sys/thread2.h> 57 #include <sys/ucred.h> 58 #include <sys/bus.h> 59 60 #include "dcons.h" 61 #include "dcons_os.h" 62 63 #include <ddb/ddb.h> 64 #include <sys/reboot.h> 65 66 #include <sys/sysctl.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_param.h> 70 #include <vm/pmap.h> 71 72 #include "opt_ddb.h" 73 #include "opt_comconsole.h" 74 #include "opt_dcons.h" 75 76 #ifndef DCONS_POLL_HZ 77 #define DCONS_POLL_HZ 100 78 #endif 79 80 #ifndef DCONS_BUF_SIZE 81 #define DCONS_BUF_SIZE (16*1024) 82 #endif 83 84 #ifndef DCONS_FORCE_CONSOLE 85 #define DCONS_FORCE_CONSOLE 0 /* Mostly for FreeBSD-4/DragonFly */ 86 #endif 87 88 #ifndef DCONS_FORCE_GDB 89 #define DCONS_FORCE_GDB 1 90 #endif 91 92 static d_open_t dcons_open; 93 static d_close_t dcons_close; 94 static d_ioctl_t dcons_ioctl; 95 96 static struct dev_ops dcons_ops = { 97 { "dcons", 0, D_TTY }, 98 .d_open = dcons_open, 99 .d_close = dcons_close, 100 .d_read = ttyread, 101 .d_write = ttywrite, 102 .d_ioctl = dcons_ioctl, 103 .d_kqfilter = ttykqfilter, 104 .d_revoke = ttyrevoke 105 }; 106 107 #ifndef KLD_MODULE 108 static char bssbuf[DCONS_BUF_SIZE]; /* buf in bss */ 109 #endif 110 111 /* global data */ 112 static struct dcons_global dg; 113 struct dcons_global *dcons_conf; 114 static int poll_hz = DCONS_POLL_HZ; 115 116 static struct dcons_softc sc[DCONS_NPORT]; 117 118 SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console"); 119 SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0, 120 "dcons polling rate"); 121 122 static int drv_init = 0; 123 static struct callout dcons_callout; 124 struct dcons_buf *dcons_buf; /* for local dconschat */ 125 126 #ifdef __DragonFly__ 127 #define DEV cdev_t 128 #define THREAD d_thread_t 129 #elif __FreeBSD_version < 500000 130 #define DEV cdev_t 131 #define THREAD struct proc 132 #else 133 #define DEV struct cdev * 134 #define THREAD struct thread 135 #endif 136 137 138 static void dcons_tty_start(struct tty *); 139 static int dcons_tty_param(struct tty *, struct termios *); 140 static void dcons_timeout(void *); 141 static int dcons_drv_init(int); 142 143 static cn_probe_t dcons_cnprobe; 144 static cn_init_t dcons_cninit; 145 static cn_init_fini_t dcons_cninit_fini; 146 static cn_getc_t dcons_cngetc; 147 static cn_checkc_t dcons_cncheckc; 148 static cn_putc_t dcons_cnputc; 149 150 CONS_DRIVER(dcons, dcons_cnprobe, dcons_cninit, dcons_cninit_fini, 151 NULL, dcons_cngetc, dcons_cncheckc, dcons_cnputc, NULL, NULL); 152 153 #if __FreeBSD_version >= 502122 154 static gdb_probe_f dcons_dbg_probe; 155 static gdb_init_f dcons_dbg_init; 156 static gdb_term_f dcons_dbg_term; 157 static gdb_getc_f dcons_dbg_getc; 158 static gdb_checkc_f dcons_dbg_checkc; 159 static gdb_putc_f dcons_dbg_putc; 160 161 GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term, 162 dcons_dbg_checkc, dcons_dbg_getc, dcons_dbg_putc); 163 164 extern struct gdb_dbgport *gdb_cur; 165 #endif 166 167 #if (KDB || DDB) && ALT_BREAK_TO_DEBUGGER 168 static int 169 dcons_check_break(struct dcons_softc *dc, int c) 170 { 171 if (c < 0) 172 return (c); 173 174 lwkt_gettoken(&tty_token); 175 #if __FreeBSD_version >= 502122 176 if (kdb_alt_break(c, &dc->brk_state)) { 177 if ((dc->flags & DC_GDB) != 0) { 178 if (gdb_cur == &dcons_gdb_dbgport) { 179 kdb_dbbe_select("gdb"); 180 breakpoint(); 181 } 182 } else 183 breakpoint(); 184 } 185 #else 186 switch (dc->brk_state) { 187 case STATE1: 188 if (c == KEY_TILDE) 189 dc->brk_state = STATE2; 190 else 191 dc->brk_state = STATE0; 192 break; 193 case STATE2: 194 dc->brk_state = STATE0; 195 if (c == KEY_CTRLB) { 196 #if DCONS_FORCE_GDB 197 if (dc->flags & DC_GDB) 198 boothowto |= RB_GDB; 199 #endif 200 breakpoint(); 201 } 202 } 203 if (c == KEY_CR) 204 dc->brk_state = STATE1; 205 #endif 206 lwkt_reltoken(&tty_token); 207 return (c); 208 } 209 #else 210 #define dcons_check_break(dc, c) (c) 211 #endif 212 213 static int 214 dcons_os_checkc(struct dcons_softc *dc) 215 { 216 int c; 217 218 lwkt_gettoken(&tty_token); 219 if (dg.dma_tag != NULL) 220 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD); 221 222 c = dcons_check_break(dc, dcons_checkc(dc)); 223 224 if (dg.dma_tag != NULL) 225 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD); 226 227 lwkt_reltoken(&tty_token); 228 return (c); 229 } 230 231 static int 232 dcons_os_getc(struct dcons_softc *dc) 233 { 234 int c; 235 236 while ((c = dcons_os_checkc(dc)) == -1); 237 238 return (c & 0xff); 239 } 240 241 static void 242 dcons_os_putc(struct dcons_softc *dc, int c) 243 { 244 if (dg.dma_tag != NULL) 245 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE); 246 247 dcons_putc(dc, c); 248 249 if (dg.dma_tag != NULL) 250 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE); 251 } 252 static int 253 dcons_open(struct dev_open_args *ap) 254 { 255 cdev_t dev = ap->a_head.a_dev; 256 struct tty *tp; 257 int unit, error; 258 259 unit = minor(dev); 260 if (unit != 0) 261 return (ENXIO); 262 263 lwkt_gettoken(&tty_token); 264 tp = dev->si_tty = ttymalloc(dev->si_tty); 265 tp->t_oproc = dcons_tty_start; 266 tp->t_param = dcons_tty_param; 267 tp->t_stop = nottystop; 268 tp->t_dev = dev; 269 270 error = 0; 271 272 crit_enter(); 273 if ((tp->t_state & TS_ISOPEN) == 0) { 274 tp->t_state |= TS_CARR_ON; 275 ttychars(tp); 276 tp->t_iflag = TTYDEF_IFLAG; 277 tp->t_oflag = TTYDEF_OFLAG; 278 tp->t_cflag = TTYDEF_CFLAG|CLOCAL; 279 tp->t_lflag = TTYDEF_LFLAG; 280 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 281 ttsetwater(tp); 282 } else if ((tp->t_state & TS_XCLUDE) && priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) { 283 crit_exit(); 284 lwkt_reltoken(&tty_token); 285 return (EBUSY); 286 } 287 crit_exit(); 288 289 #if __FreeBSD_version < 502113 290 error = (*linesw[tp->t_line].l_open)(dev, tp); 291 #else 292 error = ttyld_open(tp, dev); 293 #endif 294 lwkt_reltoken(&tty_token); 295 return (error); 296 } 297 298 static int 299 dcons_close(struct dev_close_args *ap) 300 { 301 cdev_t dev = ap->a_head.a_dev; 302 int unit; 303 struct tty *tp; 304 305 unit = minor(dev); 306 if (unit != 0) 307 return (ENXIO); 308 309 lwkt_gettoken(&tty_token); 310 tp = dev->si_tty; 311 if (tp->t_state & TS_ISOPEN) { 312 (*linesw[tp->t_line].l_close)(tp, ap->a_fflag); 313 ttyclose(tp); 314 } 315 lwkt_reltoken(&tty_token); 316 317 return (0); 318 } 319 320 static int 321 dcons_ioctl(struct dev_ioctl_args *ap) 322 { 323 cdev_t dev = ap->a_head.a_dev; 324 int unit; 325 struct tty *tp; 326 int error; 327 328 unit = minor(dev); 329 if (unit != 0) 330 return (ENXIO); 331 332 lwkt_gettoken(&tty_token); 333 tp = dev->si_tty; 334 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data, ap->a_fflag, ap->a_cred); 335 if (error != ENOIOCTL) { 336 lwkt_reltoken(&tty_token); 337 return (error); 338 } 339 340 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag); 341 if (error != ENOIOCTL) { 342 lwkt_reltoken(&tty_token); 343 return (error); 344 } 345 346 lwkt_reltoken(&tty_token); 347 return (ENOTTY); 348 } 349 350 static int 351 dcons_tty_param(struct tty *tp, struct termios *t) 352 { 353 lwkt_gettoken(&tty_token); 354 tp->t_ispeed = t->c_ispeed; 355 tp->t_ospeed = t->c_ospeed; 356 tp->t_cflag = t->c_cflag; 357 lwkt_reltoken(&tty_token); 358 return 0; 359 } 360 361 static void 362 dcons_tty_start(struct tty *tp) 363 { 364 struct dcons_softc *dc; 365 366 lwkt_gettoken(&tty_token); 367 dc = (struct dcons_softc *)tp->t_dev->si_drv1; 368 crit_enter(); 369 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) { 370 ttwwakeup(tp); 371 crit_exit(); 372 lwkt_reltoken(&tty_token); 373 return; 374 } 375 376 tp->t_state |= TS_BUSY; 377 while (tp->t_outq.c_cc != 0) 378 dcons_os_putc(dc, clist_getc(&tp->t_outq)); 379 tp->t_state &= ~TS_BUSY; 380 381 ttwwakeup(tp); 382 crit_exit(); 383 lwkt_reltoken(&tty_token); 384 } 385 386 static void 387 dcons_timeout(void *v) 388 { 389 struct tty *tp; 390 struct dcons_softc *dc; 391 int i, c, polltime; 392 393 lwkt_gettoken(&tty_token); 394 for (i = 0; i < DCONS_NPORT; i ++) { 395 dc = &sc[i]; 396 tp = ((DEV)dc->dev)->si_tty; 397 while ((c = dcons_os_checkc(dc)) != -1) 398 if (tp->t_state & TS_ISOPEN) 399 #if __FreeBSD_version < 502113 400 (*linesw[tp->t_line].l_rint)(c, tp); 401 #else 402 ttyld_rint(tp, c); 403 #endif 404 } 405 polltime = hz / poll_hz; 406 if (polltime < 1) 407 polltime = 1; 408 callout_reset(&dcons_callout, polltime, dcons_timeout, tp); 409 lwkt_reltoken(&tty_token); 410 } 411 412 static void 413 dcons_cnprobe(struct consdev *cp) 414 { 415 #ifdef __DragonFly__ 416 cp->cn_probegood = 1; 417 #elif __FreeBSD_version >= 501109 418 ksprintf(cp->cn_name, "dcons"); 419 #else 420 cp->cn_dev = makedev(CDEV_MAJOR, DCONS_CON); 421 #endif 422 #if DCONS_FORCE_CONSOLE 423 cp->cn_pri = CN_REMOTE; 424 #else 425 cp->cn_pri = CN_NORMAL; 426 #endif 427 } 428 429 static void 430 dcons_cninit(struct consdev *cp) 431 { 432 dcons_drv_init(0); 433 #if CONS_NODEV 434 cp->cn_arg 435 #else 436 cp->cn_private 437 #endif 438 = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */ 439 } 440 441 static void 442 dcons_cninit_fini(struct consdev *cp) 443 { 444 cp->cn_dev = make_dev(&dcons_ops, DCONS_CON, 445 UID_ROOT, GID_WHEEL, 0600, "dcons"); 446 } 447 448 #if CONS_NODEV 449 static int 450 dcons_cngetc(struct consdev *cp) 451 { 452 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 453 return (dcons_os_getc(dc)); 454 } 455 static int 456 dcons_cncheckc(struct consdev *cp) 457 { 458 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 459 return (dcons_os_checkc(dc)); 460 } 461 static void 462 dcons_cnputc(struct consdev *cp, int c) 463 { 464 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 465 dcons_os_putc(dc, c); 466 } 467 #else 468 static int 469 dcons_cngetc(void *private) 470 { 471 struct dcons_softc *dc = (struct dcons_softc *)private; 472 return (dcons_os_getc(dc)); 473 } 474 static int 475 dcons_cncheckc(void *private) 476 { 477 struct dcons_softc *dc = (struct dcons_softc *)private; 478 return (dcons_os_checkc(dc)); 479 } 480 static void 481 dcons_cnputc(void *private, int c) 482 { 483 struct dcons_softc *dc = (struct dcons_softc *)private; 484 dcons_os_putc(dc, c); 485 } 486 #endif 487 488 static int 489 dcons_drv_init(int stage) 490 { 491 #ifdef __i386__ 492 quad_t addr, size; 493 #endif 494 495 if (drv_init) 496 return(drv_init); 497 498 drv_init = -1; 499 500 bzero(&dg, sizeof(dg)); 501 dcons_conf = &dg; 502 dg.cdev = &dcons_consdev; 503 dg.buf = NULL; 504 dg.size = DCONS_BUF_SIZE; 505 506 #ifdef __i386__ 507 if (kgetenv_quad("dcons.addr", &addr) > 0 && 508 kgetenv_quad("dcons.size", &size) > 0) { 509 vm_paddr_t pa; 510 /* 511 * Allow read/write access to dcons buffer. 512 */ 513 for (pa = trunc_page(addr); pa < addr + size; pa += PAGE_SIZE) 514 pmap_kmodify_rw((vm_offset_t)(KERNBASE + pa)); 515 cpu_invltlb(); 516 /* XXX P to V */ 517 dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr); 518 dg.size = size; 519 if (dcons_load_buffer(dg.buf, dg.size, sc) < 0) 520 dg.buf = NULL; 521 } 522 #endif 523 if (dg.buf != NULL) 524 goto ok; 525 526 #ifndef KLD_MODULE 527 if (stage == 0) { /* XXX or cold */ 528 /* 529 * DCONS_FORCE_CONSOLE == 1 and statically linked. 530 * called from cninit(). can't use contigmalloc yet . 531 */ 532 dg.buf = (struct dcons_buf *) bssbuf; 533 dcons_init(dg.buf, dg.size, sc); 534 } else 535 #endif 536 { 537 /* 538 * DCONS_FORCE_CONSOLE == 0 or kernel module case. 539 * if the module is loaded after boot, 540 * bssbuf could be non-continuous. 541 */ 542 dg.buf = (struct dcons_buf *) contigmalloc(dg.size, 543 M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul); 544 dcons_init(dg.buf, dg.size, sc); 545 } 546 547 ok: 548 dcons_buf = dg.buf; 549 550 #if DDB && DCONS_FORCE_GDB 551 if (gdb_tab == NULL) { 552 gdb_tab = &dcons_consdev; 553 dcons_consdev.cn_gdbprivate = &sc[DCONS_GDB]; 554 } 555 #endif 556 drv_init = 1; 557 558 return 0; 559 } 560 561 /* 562 * NOTE: Must be called with tty_token held 563 */ 564 static int 565 dcons_attach_port(int port, char *name, int flags) 566 { 567 struct dcons_softc *dc; 568 struct tty *tp; 569 DEV dev; 570 571 ASSERT_LWKT_TOKEN_HELD(&tty_token); 572 dc = &sc[port]; 573 dc->flags = flags; 574 dev = make_dev(&dcons_ops, port, UID_ROOT, GID_WHEEL, 0600, "%s", 575 name); 576 dc->dev = (void *)dev; 577 tp = ttymalloc(NULL); 578 579 dev->si_drv1 = (void *)dc; 580 dev->si_tty = tp; 581 582 tp->t_oproc = dcons_tty_start; 583 tp->t_param = dcons_tty_param; 584 tp->t_stop = nottystop; 585 tp->t_dev = dc->dev; 586 587 return(0); 588 } 589 590 /* 591 * NOTE: Must be called with tty_token held 592 */ 593 static int 594 dcons_attach(void) 595 { 596 int polltime; 597 598 ASSERT_LWKT_TOKEN_HELD(&tty_token); 599 dcons_attach_port(DCONS_CON, "dcons", 0); 600 dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB); 601 #if __FreeBSD_version < 500000 602 callout_init_mp(&dcons_callout); 603 #else 604 callout_init(&dcons_callout, 0); 605 #endif 606 polltime = hz / poll_hz; 607 if (polltime < 1) 608 polltime = 1; 609 callout_reset(&dcons_callout, polltime, dcons_timeout, NULL); 610 return(0); 611 } 612 613 /* 614 * NOTE: Must be called with tty_token held 615 */ 616 static int 617 dcons_detach(int port) 618 { 619 struct tty *tp; 620 struct dcons_softc *dc; 621 622 ASSERT_LWKT_TOKEN_HELD(&tty_token); 623 dc = &sc[port]; 624 625 tp = ((DEV)dc->dev)->si_tty; 626 627 if (tp->t_state & TS_ISOPEN) { 628 kprintf("dcons: still opened\n"); 629 #if __FreeBSD_version < 502113 630 (*linesw[tp->t_line].l_close)(tp, 0); 631 ttyclose(tp); 632 #else 633 ttyld_close(tp, 0); 634 tty_close(tp); 635 #endif 636 } 637 /* XXX 638 * must wait until all device are closed. 639 */ 640 #ifdef __DragonFly__ 641 tsleep((void *)dc, 0, "dcodtc", hz/4); 642 #else 643 tsleep((void *)dc, PWAIT, "dcodtc", hz/4); 644 #endif 645 destroy_dev(dc->dev); 646 647 return(0); 648 } 649 650 651 /* cnXXX works only for FreeBSD-5 */ 652 static int 653 dcons_modevent(module_t mode, int type, void *data) 654 { 655 int err = 0, ret; 656 657 lwkt_gettoken(&tty_token); 658 switch (type) { 659 case MOD_LOAD: 660 ret = dcons_drv_init(1); 661 dcons_attach(); 662 #if __FreeBSD_version >= 500000 663 if (ret == 0) { 664 dcons_cnprobe(&dcons_consdev); 665 dcons_cninit(&dcons_consdev); 666 cnadd(&dcons_consdev); 667 } 668 #endif 669 break; 670 case MOD_UNLOAD: 671 kprintf("dcons: unload\n"); 672 callout_stop(&dcons_callout); 673 #if __FreeBSD_version < 502122 674 #if DDB && DCONS_FORCE_GDB 675 #if CONS_NODEV 676 gdb_arg = NULL; 677 #else 678 if (gdb_tab == &dcons_consdev) 679 gdb_tab = NULL; 680 #endif 681 #endif 682 #endif 683 #if __FreeBSD_version >= 500000 684 cnremove(&dcons_consdev); 685 #endif 686 dcons_detach(DCONS_CON); 687 dcons_detach(DCONS_GDB); 688 dg.buf->magic = 0; 689 690 contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF); 691 692 break; 693 case MOD_SHUTDOWN: 694 dg.buf->magic = 0; 695 break; 696 default: 697 err = EOPNOTSUPP; 698 break; 699 } 700 lwkt_reltoken(&tty_token); 701 return(err); 702 } 703 704 #if __FreeBSD_version >= 502122 705 /* Debugger interface */ 706 707 static int 708 dcons_dbg_probe(void) 709 { 710 return(DCONS_FORCE_GDB); 711 } 712 713 static void 714 dcons_dbg_init(void) 715 { 716 } 717 718 static void 719 dcons_dbg_term(void) 720 { 721 } 722 723 static void 724 dcons_dbg_putc(int c) 725 { 726 struct dcons_softc *dc = &sc[DCONS_GDB]; 727 dcons_os_putc(dc, c); 728 } 729 730 static int 731 dcons_dbg_checkc(void) 732 { 733 struct dcons_softc *dc = &sc[DCONS_GDB]; 734 return (dcons_os_checkc(dc)); 735 } 736 737 static int 738 dcons_dbg_getc(void) 739 { 740 struct dcons_softc *dc = &sc[DCONS_GDB]; 741 return (dcons_os_getc(dc)); 742 } 743 #endif 744 745 DEV_MODULE(dcons, dcons_modevent, NULL); 746 MODULE_VERSION(dcons, DCONS_VERSION); 747