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 __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 258 259 static int 260 dcons_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 } 274 275 static int 276 dcons_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) 283 static int 284 dcons_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 293 294 static void 295 dcons_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 } 305 static int 306 dcons_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 } 342 343 static int 344 dcons_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 368 static int 369 dcons_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 391 392 static int 393 dcons_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 } 400 401 static void 402 dcons_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 } 422 423 static void 424 dcons_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 } 446 447 static void 448 dcons_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 } 464 465 static void 466 dcons_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 } 476 477 static void 478 dcons_cnterm(struct consdev *cp) 479 { 480 } 481 482 #if CONS_NODEV 483 static int 484 dcons_cngetc(struct consdev *cp) 485 { 486 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 487 return (dcons_os_checkc(dc)); 488 } 489 static void 490 dcons_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 496 static int 497 dcons_cngetc(DEV dev) 498 { 499 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 500 return (dcons_os_getc(dc)); 501 } 502 static int 503 dcons_cncheckc(DEV dev) 504 { 505 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 506 return (dcons_os_checkc(dc)); 507 } 508 static void 509 dcons_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 515 516 static int 517 dcons_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 } 576 577 ok: 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 } 602 603 604 static int 605 dcons_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 } 628 629 static int 630 dcons_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 } 650 651 static int 652 dcons_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 */ 689 static int 690 dcons_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 */ 742 743 static int 744 dcons_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 } 752 753 static void 754 dcons_dbg_init(void) 755 { 756 } 757 758 static void 759 dcons_dbg_term(void) 760 { 761 } 762 763 static void 764 dcons_dbg_putc(int c) 765 { 766 struct dcons_softc *dc = &sc[DCONS_GDB]; 767 dcons_os_putc(dc, c); 768 } 769 770 static int 771 dcons_dbg_getc(void) 772 { 773 struct dcons_softc *dc = &sc[DCONS_GDB]; 774 return (dcons_os_getc(dc)); 775 } 776 #endif 777 778 DEV_MODULE(dcons, dcons_modevent, NULL); 779 MODULE_VERSION(dcons, DCONS_VERSION); 780