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 * $DragonFly: src/sys/dev/misc/dcons/dcons_os.c,v 1.13 2007/08/07 13:14:11 hasso Exp $ 38 */ 39 40 #include <sys/param.h> 41 #if __FreeBSD_version >= 502122 42 #include <sys/kdb.h> 43 #include <gdb/gdb.h> 44 #endif 45 #include <sys/kernel.h> 46 #include <sys/module.h> 47 #include <sys/systm.h> 48 #include <sys/types.h> 49 #include <sys/conf.h> 50 #include <sys/cons.h> 51 #include <sys/consio.h> 52 #include <sys/tty.h> 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 #define CDEV_MAJOR 184 93 94 static d_open_t dcons_open; 95 static d_close_t dcons_close; 96 static d_ioctl_t dcons_ioctl; 97 98 static struct dev_ops dcons_ops = { 99 { "dcons", CDEV_MAJOR, D_TTY }, 100 .d_open = dcons_open, 101 .d_close = dcons_close, 102 .d_read = ttyread, 103 .d_write = ttywrite, 104 .d_ioctl = dcons_ioctl, 105 .d_kqfilter = ttykqfilter, 106 .d_revoke = ttyrevoke 107 }; 108 109 #ifndef KLD_MODULE 110 static char bssbuf[DCONS_BUF_SIZE]; /* buf in bss */ 111 #endif 112 113 /* global data */ 114 static struct dcons_global dg; 115 struct dcons_global *dcons_conf; 116 static int poll_hz = DCONS_POLL_HZ; 117 118 static struct dcons_softc sc[DCONS_NPORT]; 119 120 SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console"); 121 SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0, 122 "dcons polling rate"); 123 124 static int drv_init = 0; 125 static struct callout dcons_callout; 126 struct dcons_buf *dcons_buf; /* for local dconschat */ 127 128 #ifdef __DragonFly__ 129 #define DEV cdev_t 130 #define THREAD d_thread_t 131 #elif __FreeBSD_version < 500000 132 #define DEV cdev_t 133 #define THREAD struct proc 134 #else 135 #define DEV struct cdev * 136 #define THREAD struct thread 137 #endif 138 139 140 static void dcons_tty_start(struct tty *); 141 static int dcons_tty_param(struct tty *, struct termios *); 142 static void dcons_timeout(void *); 143 static int dcons_drv_init(int); 144 145 static cn_probe_t dcons_cnprobe; 146 static cn_init_t dcons_cninit; 147 static cn_init_fini_t dcons_cninit_fini; 148 static cn_getc_t dcons_cngetc; 149 static cn_checkc_t dcons_cncheckc; 150 static cn_putc_t dcons_cnputc; 151 152 CONS_DRIVER(dcons, dcons_cnprobe, dcons_cninit, dcons_cninit_fini, 153 NULL, dcons_cngetc, dcons_cncheckc, dcons_cnputc, NULL); 154 155 #if __FreeBSD_version >= 502122 156 static gdb_probe_f dcons_dbg_probe; 157 static gdb_init_f dcons_dbg_init; 158 static gdb_term_f dcons_dbg_term; 159 static gdb_getc_f dcons_dbg_getc; 160 static gdb_checkc_f dcons_dbg_checkc; 161 static gdb_putc_f dcons_dbg_putc; 162 163 GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term, 164 dcons_dbg_checkc, dcons_dbg_getc, dcons_dbg_putc); 165 166 extern struct gdb_dbgport *gdb_cur; 167 #endif 168 169 #if (KDB || DDB) && ALT_BREAK_TO_DEBUGGER 170 static int 171 dcons_check_break(struct dcons_softc *dc, int c) 172 { 173 if (c < 0) 174 return (c); 175 176 lwkt_gettoken(&tty_token); 177 #if __FreeBSD_version >= 502122 178 if (kdb_alt_break(c, &dc->brk_state)) { 179 if ((dc->flags & DC_GDB) != 0) { 180 if (gdb_cur == &dcons_gdb_dbgport) { 181 kdb_dbbe_select("gdb"); 182 breakpoint(); 183 } 184 } else 185 breakpoint(); 186 } 187 #else 188 switch (dc->brk_state) { 189 case STATE1: 190 if (c == KEY_TILDE) 191 dc->brk_state = STATE2; 192 else 193 dc->brk_state = STATE0; 194 break; 195 case STATE2: 196 dc->brk_state = STATE0; 197 if (c == KEY_CTRLB) { 198 #if DCONS_FORCE_GDB 199 if (dc->flags & DC_GDB) 200 boothowto |= RB_GDB; 201 #endif 202 breakpoint(); 203 } 204 } 205 if (c == KEY_CR) 206 dc->brk_state = STATE1; 207 #endif 208 lwkt_reltoken(&tty_token); 209 return (c); 210 } 211 #else 212 #define dcons_check_break(dc, c) (c) 213 #endif 214 215 static int 216 dcons_os_checkc(struct dcons_softc *dc) 217 { 218 int c; 219 220 lwkt_gettoken(&tty_token); 221 if (dg.dma_tag != NULL) 222 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD); 223 224 c = dcons_check_break(dc, dcons_checkc(dc)); 225 226 if (dg.dma_tag != NULL) 227 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD); 228 229 lwkt_reltoken(&tty_token); 230 return (c); 231 } 232 233 static int 234 dcons_os_getc(struct dcons_softc *dc) 235 { 236 int c; 237 238 while ((c = dcons_os_checkc(dc)) == -1); 239 240 return (c & 0xff); 241 } 242 243 static void 244 dcons_os_putc(struct dcons_softc *dc, int c) 245 { 246 if (dg.dma_tag != NULL) 247 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE); 248 249 dcons_putc(dc, c); 250 251 if (dg.dma_tag != NULL) 252 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE); 253 } 254 static int 255 dcons_open(struct dev_open_args *ap) 256 { 257 cdev_t dev = ap->a_head.a_dev; 258 struct tty *tp; 259 int unit, error; 260 261 unit = minor(dev); 262 if (unit != 0) 263 return (ENXIO); 264 265 lwkt_gettoken(&tty_token); 266 tp = dev->si_tty = ttymalloc(dev->si_tty); 267 tp->t_oproc = dcons_tty_start; 268 tp->t_param = dcons_tty_param; 269 tp->t_stop = nottystop; 270 tp->t_dev = dev; 271 272 error = 0; 273 274 crit_enter(); 275 if ((tp->t_state & TS_ISOPEN) == 0) { 276 tp->t_state |= TS_CARR_ON; 277 ttychars(tp); 278 tp->t_iflag = TTYDEF_IFLAG; 279 tp->t_oflag = TTYDEF_OFLAG; 280 tp->t_cflag = TTYDEF_CFLAG|CLOCAL; 281 tp->t_lflag = TTYDEF_LFLAG; 282 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 283 ttsetwater(tp); 284 } else if ((tp->t_state & TS_XCLUDE) && priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) { 285 crit_exit(); 286 lwkt_reltoken(&tty_token); 287 return (EBUSY); 288 } 289 crit_exit(); 290 291 #if __FreeBSD_version < 502113 292 error = (*linesw[tp->t_line].l_open)(dev, tp); 293 #else 294 error = ttyld_open(tp, dev); 295 #endif 296 lwkt_reltoken(&tty_token); 297 return (error); 298 } 299 300 static int 301 dcons_close(struct dev_close_args *ap) 302 { 303 cdev_t dev = ap->a_head.a_dev; 304 int unit; 305 struct tty *tp; 306 307 unit = minor(dev); 308 if (unit != 0) 309 return (ENXIO); 310 311 lwkt_gettoken(&tty_token); 312 tp = dev->si_tty; 313 if (tp->t_state & TS_ISOPEN) { 314 (*linesw[tp->t_line].l_close)(tp, ap->a_fflag); 315 ttyclose(tp); 316 } 317 lwkt_reltoken(&tty_token); 318 319 return (0); 320 } 321 322 static int 323 dcons_ioctl(struct dev_ioctl_args *ap) 324 { 325 cdev_t dev = ap->a_head.a_dev; 326 int unit; 327 struct tty *tp; 328 int error; 329 330 unit = minor(dev); 331 if (unit != 0) 332 return (ENXIO); 333 334 lwkt_gettoken(&tty_token); 335 tp = dev->si_tty; 336 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data, ap->a_fflag, ap->a_cred); 337 if (error != ENOIOCTL) { 338 lwkt_reltoken(&tty_token); 339 return (error); 340 } 341 342 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag); 343 if (error != ENOIOCTL) { 344 lwkt_reltoken(&tty_token); 345 return (error); 346 } 347 348 lwkt_reltoken(&tty_token); 349 return (ENOTTY); 350 } 351 352 static int 353 dcons_tty_param(struct tty *tp, struct termios *t) 354 { 355 lwkt_gettoken(&tty_token); 356 tp->t_ispeed = t->c_ispeed; 357 tp->t_ospeed = t->c_ospeed; 358 tp->t_cflag = t->c_cflag; 359 lwkt_reltoken(&tty_token); 360 return 0; 361 } 362 363 static void 364 dcons_tty_start(struct tty *tp) 365 { 366 struct dcons_softc *dc; 367 368 lwkt_gettoken(&tty_token); 369 dc = (struct dcons_softc *)tp->t_dev->si_drv1; 370 crit_enter(); 371 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) { 372 ttwwakeup(tp); 373 lwkt_reltoken(&tty_token); 374 return; 375 } 376 377 tp->t_state |= TS_BUSY; 378 while (tp->t_outq.c_cc != 0) 379 dcons_os_putc(dc, clist_getc(&tp->t_outq)); 380 tp->t_state &= ~TS_BUSY; 381 382 ttwwakeup(tp); 383 crit_exit(); 384 lwkt_reltoken(&tty_token); 385 } 386 387 static void 388 dcons_timeout(void *v) 389 { 390 struct tty *tp; 391 struct dcons_softc *dc; 392 int i, c, polltime; 393 394 lwkt_gettoken(&tty_token); 395 for (i = 0; i < DCONS_NPORT; i ++) { 396 dc = &sc[i]; 397 tp = ((DEV)dc->dev)->si_tty; 398 while ((c = dcons_os_checkc(dc)) != -1) 399 if (tp->t_state & TS_ISOPEN) 400 #if __FreeBSD_version < 502113 401 (*linesw[tp->t_line].l_rint)(c, tp); 402 #else 403 ttyld_rint(tp, c); 404 #endif 405 } 406 polltime = hz / poll_hz; 407 if (polltime < 1) 408 polltime = 1; 409 callout_reset(&dcons_callout, polltime, dcons_timeout, tp); 410 lwkt_reltoken(&tty_token); 411 } 412 413 static void 414 dcons_cnprobe(struct consdev *cp) 415 { 416 #ifdef __DragonFly__ 417 cp->cn_probegood = 1; 418 #elif __FreeBSD_version >= 501109 419 ksprintf(cp->cn_name, "dcons"); 420 #else 421 cp->cn_dev = makedev(CDEV_MAJOR, DCONS_CON); 422 #endif 423 #if DCONS_FORCE_CONSOLE 424 cp->cn_pri = CN_REMOTE; 425 #else 426 cp->cn_pri = CN_NORMAL; 427 #endif 428 } 429 430 static void 431 dcons_cninit(struct consdev *cp) 432 { 433 dcons_drv_init(0); 434 #if CONS_NODEV 435 cp->cn_arg 436 #else 437 cp->cn_private 438 #endif 439 = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */ 440 } 441 442 static void 443 dcons_cninit_fini(struct consdev *cp) 444 { 445 cp->cn_dev = make_dev(&dcons_ops, DCONS_CON, 446 UID_ROOT, GID_WHEEL, 0600, "dcons"); 447 } 448 449 #if CONS_NODEV 450 static int 451 dcons_cngetc(struct consdev *cp) 452 { 453 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 454 return (dcons_os_getc(dc)); 455 } 456 static int 457 dcons_cncheckc(struct consdev *cp) 458 { 459 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 460 return (dcons_os_checkc(dc)); 461 } 462 static void 463 dcons_cnputc(struct consdev *cp, int c) 464 { 465 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 466 dcons_os_putc(dc, c); 467 } 468 #else 469 static int 470 dcons_cngetc(void *private) 471 { 472 struct dcons_softc *dc = (struct dcons_softc *)private; 473 return (dcons_os_getc(dc)); 474 } 475 static int 476 dcons_cncheckc(void *private) 477 { 478 struct dcons_softc *dc = (struct dcons_softc *)private; 479 return (dcons_os_checkc(dc)); 480 } 481 static void 482 dcons_cnputc(void *private, int c) 483 { 484 struct dcons_softc *dc = (struct dcons_softc *)private; 485 dcons_os_putc(dc, c); 486 } 487 #endif 488 489 static int 490 dcons_drv_init(int stage) 491 { 492 #ifdef __i386__ 493 quad_t addr, size; 494 #endif 495 496 if (drv_init) 497 return(drv_init); 498 499 drv_init = -1; 500 501 bzero(&dg, sizeof(dg)); 502 dcons_conf = &dg; 503 dg.cdev = &dcons_consdev; 504 dg.buf = NULL; 505 dg.size = DCONS_BUF_SIZE; 506 507 #ifdef __i386__ 508 if (kgetenv_quad("dcons.addr", &addr) > 0 && 509 kgetenv_quad("dcons.size", &size) > 0) { 510 vm_paddr_t pa; 511 /* 512 * Allow read/write access to dcons buffer. 513 */ 514 for (pa = trunc_page(addr); pa < addr + size; pa += PAGE_SIZE) 515 pmap_kmodify_rw((vm_offset_t)(KERNBASE + pa)); 516 cpu_invltlb(); 517 /* XXX P to V */ 518 dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr); 519 dg.size = size; 520 if (dcons_load_buffer(dg.buf, dg.size, sc) < 0) 521 dg.buf = NULL; 522 } 523 #endif 524 if (dg.buf != NULL) 525 goto ok; 526 527 #ifndef KLD_MODULE 528 if (stage == 0) { /* XXX or cold */ 529 /* 530 * DCONS_FORCE_CONSOLE == 1 and statically linked. 531 * called from cninit(). can't use contigmalloc yet . 532 */ 533 dg.buf = (struct dcons_buf *) bssbuf; 534 dcons_init(dg.buf, dg.size, sc); 535 } else 536 #endif 537 { 538 /* 539 * DCONS_FORCE_CONSOLE == 0 or kernel module case. 540 * if the module is loaded after boot, 541 * bssbuf could be non-continuous. 542 */ 543 dg.buf = (struct dcons_buf *) contigmalloc(dg.size, 544 M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul); 545 dcons_init(dg.buf, dg.size, sc); 546 } 547 548 ok: 549 dcons_buf = dg.buf; 550 551 #if DDB && DCONS_FORCE_GDB 552 if (gdb_tab == NULL) { 553 gdb_tab = &dcons_consdev; 554 dcons_consdev.cn_gdbprivate = &sc[DCONS_GDB]; 555 } 556 #endif 557 drv_init = 1; 558 559 return 0; 560 } 561 562 /* 563 * NOTE: Must be called with tty_token held 564 */ 565 static int 566 dcons_attach_port(int port, char *name, int flags) 567 { 568 struct dcons_softc *dc; 569 struct tty *tp; 570 DEV dev; 571 572 ASSERT_LWKT_TOKEN_HELD(&tty_token); 573 dc = &sc[port]; 574 dc->flags = flags; 575 dev = make_dev(&dcons_ops, port, 576 UID_ROOT, GID_WHEEL, 0600, name); 577 dc->dev = (void *)dev; 578 tp = ttymalloc(NULL); 579 580 dev->si_drv1 = (void *)dc; 581 dev->si_tty = tp; 582 583 tp->t_oproc = dcons_tty_start; 584 tp->t_param = dcons_tty_param; 585 tp->t_stop = nottystop; 586 tp->t_dev = dc->dev; 587 588 return(0); 589 } 590 591 /* 592 * NOTE: Must be called with tty_token held 593 */ 594 static int 595 dcons_attach(void) 596 { 597 int polltime; 598 599 ASSERT_LWKT_TOKEN_HELD(&tty_token); 600 dcons_attach_port(DCONS_CON, "dcons", 0); 601 dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB); 602 #if __FreeBSD_version < 500000 603 callout_init_mp(&dcons_callout); 604 #else 605 callout_init(&dcons_callout, 0); 606 #endif 607 polltime = hz / poll_hz; 608 if (polltime < 1) 609 polltime = 1; 610 callout_reset(&dcons_callout, polltime, dcons_timeout, NULL); 611 return(0); 612 } 613 614 /* 615 * NOTE: Must be called with tty_token held 616 */ 617 static int 618 dcons_detach(int port) 619 { 620 struct tty *tp; 621 struct dcons_softc *dc; 622 623 ASSERT_LWKT_TOKEN_HELD(&tty_token); 624 dc = &sc[port]; 625 626 tp = ((DEV)dc->dev)->si_tty; 627 628 if (tp->t_state & TS_ISOPEN) { 629 kprintf("dcons: still opened\n"); 630 #if __FreeBSD_version < 502113 631 (*linesw[tp->t_line].l_close)(tp, 0); 632 ttyclose(tp); 633 #else 634 ttyld_close(tp, 0); 635 tty_close(tp); 636 #endif 637 } 638 /* XXX 639 * must wait until all device are closed. 640 */ 641 #ifdef __DragonFly__ 642 tsleep((void *)dc, 0, "dcodtc", hz/4); 643 #else 644 tsleep((void *)dc, PWAIT, "dcodtc", hz/4); 645 #endif 646 destroy_dev(dc->dev); 647 648 return(0); 649 } 650 651 652 /* cnXXX works only for FreeBSD-5 */ 653 static int 654 dcons_modevent(module_t mode, int type, void *data) 655 { 656 int err = 0, ret; 657 658 lwkt_gettoken(&tty_token); 659 switch (type) { 660 case MOD_LOAD: 661 ret = dcons_drv_init(1); 662 dcons_attach(); 663 #if __FreeBSD_version >= 500000 664 if (ret == 0) { 665 dcons_cnprobe(&dcons_consdev); 666 dcons_cninit(&dcons_consdev); 667 cnadd(&dcons_consdev); 668 } 669 #endif 670 break; 671 case MOD_UNLOAD: 672 kprintf("dcons: unload\n"); 673 callout_stop(&dcons_callout); 674 #if __FreeBSD_version < 502122 675 #if DDB && DCONS_FORCE_GDB 676 #if CONS_NODEV 677 gdb_arg = NULL; 678 #else 679 if (gdb_tab == &dcons_consdev) 680 gdb_tab = NULL; 681 #endif 682 #endif 683 #endif 684 #if __FreeBSD_version >= 500000 685 cnremove(&dcons_consdev); 686 #endif 687 dcons_detach(DCONS_CON); 688 dcons_detach(DCONS_GDB); 689 dg.buf->magic = 0; 690 691 contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF); 692 693 break; 694 case MOD_SHUTDOWN: 695 dg.buf->magic = 0; 696 break; 697 default: 698 err = EOPNOTSUPP; 699 break; 700 } 701 lwkt_reltoken(&tty_token); 702 return(err); 703 } 704 705 #if __FreeBSD_version >= 502122 706 /* Debugger interface */ 707 708 static int 709 dcons_dbg_probe(void) 710 { 711 return(DCONS_FORCE_GDB); 712 } 713 714 static void 715 dcons_dbg_init(void) 716 { 717 } 718 719 static void 720 dcons_dbg_term(void) 721 { 722 } 723 724 static void 725 dcons_dbg_putc(int c) 726 { 727 struct dcons_softc *dc = &sc[DCONS_GDB]; 728 dcons_os_putc(dc, c); 729 } 730 731 static int 732 dcons_dbg_checkc(void) 733 { 734 struct dcons_softc *dc = &sc[DCONS_GDB]; 735 return (dcons_os_checkc(dc)); 736 } 737 738 static int 739 dcons_dbg_getc(void) 740 { 741 struct dcons_softc *dc = &sc[DCONS_GDB]; 742 return (dcons_os_getc(dc)); 743 } 744 #endif 745 746 DEV_MODULE(dcons, dcons_modevent, NULL); 747 MODULE_VERSION(dcons, DCONS_VERSION); 748