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/proc.h> 52 #include <sys/ucred.h> 53 54 #include <machine/bus.h> 55 56 #ifdef __DragonFly__ 57 #include "dcons.h" 58 #include "dcons_os.h" 59 #else 60 #include <dev/dcons/dcons.h> 61 #include <dev/dcons/dcons_os.h> 62 #endif 63 64 #include <ddb/ddb.h> 65 #include <sys/reboot.h> 66 67 #include <sys/sysctl.h> 68 69 #include <vm/vm.h> 70 #include <vm/vm_param.h> 71 #include <vm/pmap.h> 72 73 #include "opt_ddb.h" 74 #include "opt_comconsole.h" 75 #include "opt_dcons.h" 76 77 #ifndef DCONS_POLL_HZ 78 #define DCONS_POLL_HZ 100 79 #endif 80 81 #ifndef DCONS_BUF_SIZE 82 #define DCONS_BUF_SIZE (16*1024) 83 #endif 84 85 #ifndef DCONS_FORCE_CONSOLE 86 #define DCONS_FORCE_CONSOLE 0 /* Mostly for FreeBSD-4/DragonFly */ 87 #endif 88 89 #ifndef DCONS_FORCE_GDB 90 #define DCONS_FORCE_GDB 1 91 #endif 92 93 #if __FreeBSD_version >= 500101 94 #define CONS_NODEV 1 95 #if __FreeBSD_version < 502122 96 static struct consdev gdbconsdev; 97 #endif 98 #endif 99 100 static d_open_t dcons_open; 101 static d_close_t dcons_close; 102 #if defined(__DragonFly__) || __FreeBSD_version < 500104 103 static d_ioctl_t dcons_ioctl; 104 #endif 105 106 static struct cdevsw dcons_cdevsw = { 107 #ifdef __DragonFly__ 108 #define CDEV_MAJOR 184 109 "dcons", CDEV_MAJOR, D_TTY, NULL, 0, 110 dcons_open, dcons_close, ttyread, ttywrite, dcons_ioctl, 111 ttypoll, nommap, nostrategy, nodump, nopsize, 112 #elif __FreeBSD_version >= 500104 113 .d_version = D_VERSION, 114 .d_open = dcons_open, 115 .d_close = dcons_close, 116 .d_name = "dcons", 117 .d_flags = D_TTY | D_NEEDGIANT, 118 #else 119 #define CDEV_MAJOR 184 120 /* open */ dcons_open, 121 /* close */ dcons_close, 122 /* read */ ttyread, 123 /* write */ ttywrite, 124 /* ioctl */ dcons_ioctl, 125 /* poll */ ttypoll, 126 /* mmap */ nommap, 127 /* strategy */ nostrategy, 128 /* name */ "dcons", 129 /* major */ CDEV_MAJOR, 130 /* dump */ nodump, 131 /* psize */ nopsize, 132 /* flags */ D_TTY, 133 #endif 134 }; 135 136 #ifndef KLD_MODULE 137 static char bssbuf[DCONS_BUF_SIZE]; /* buf in bss */ 138 #endif 139 140 /* global data */ 141 static struct dcons_global dg; 142 struct dcons_global *dcons_conf; 143 static int poll_hz = DCONS_POLL_HZ; 144 145 static struct dcons_softc sc[DCONS_NPORT]; 146 147 SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console"); 148 SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0, 149 "dcons polling rate"); 150 151 static int drv_init = 0; 152 static struct callout dcons_callout; 153 struct dcons_buf *dcons_buf; /* for local dconschat */ 154 155 #ifdef __DragonFly__ 156 #define DEV dev_t 157 #define THREAD d_thread_t 158 #elif __FreeBSD_version < 500000 159 #define DEV dev_t 160 #define THREAD struct proc 161 #else 162 #define DEV struct cdev * 163 #define THREAD struct thread 164 #endif 165 166 167 static void dcons_tty_start(struct tty *); 168 static int dcons_tty_param(struct tty *, struct termios *); 169 static void dcons_timeout(void *); 170 static int dcons_drv_init(int); 171 172 static cn_probe_t dcons_cnprobe; 173 static cn_init_t dcons_cninit; 174 static cn_getc_t dcons_cngetc; 175 static cn_checkc_t dcons_cncheckc; 176 static cn_putc_t dcons_cnputc; 177 178 CONS_DRIVER(dcons, dcons_cnprobe, dcons_cninit, NULL, dcons_cngetc, 179 dcons_cncheckc, dcons_cnputc, NULL); 180 181 #if __FreeBSD_version >= 502122 182 static gdb_probe_f dcons_dbg_probe; 183 static gdb_init_f dcons_dbg_init; 184 static gdb_term_f dcons_dbg_term; 185 static gdb_getc_f dcons_dbg_getc; 186 static gdb_checkc_f dcons_dbg_checkc; 187 static gdb_putc_f dcons_dbg_putc; 188 189 GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term, 190 dcons_dbg_checkc, dcons_dbg_getc, dcons_dbg_putc); 191 192 extern struct gdb_dbgport *gdb_cur; 193 #endif 194 195 #if (KDB || DDB) && ALT_BREAK_TO_DEBUGGER 196 static int 197 dcons_check_break(struct dcons_softc *dc, int c) 198 { 199 if (c < 0) 200 return (c); 201 202 #if __FreeBSD_version >= 502122 203 if (kdb_alt_break(c, &dc->brk_state)) { 204 if ((dc->flags & DC_GDB) != 0) { 205 if (gdb_cur == &dcons_gdb_dbgport) { 206 kdb_dbbe_select("gdb"); 207 breakpoint(); 208 } 209 } else 210 breakpoint(); 211 } 212 #else 213 switch (dc->brk_state) { 214 case STATE1: 215 if (c == KEY_TILDE) 216 dc->brk_state = STATE2; 217 else 218 dc->brk_state = STATE0; 219 break; 220 case STATE2: 221 dc->brk_state = STATE0; 222 if (c == KEY_CTRLB) { 223 #if DCONS_FORCE_GDB 224 if (dc->flags & DC_GDB) 225 boothowto |= RB_GDB; 226 #endif 227 breakpoint(); 228 } 229 } 230 if (c == KEY_CR) 231 dc->brk_state = STATE1; 232 #endif 233 return (c); 234 } 235 #else 236 #define dcons_check_break(dc, c) (c) 237 #endif 238 239 static int 240 dcons_os_checkc(struct dcons_softc *dc) 241 { 242 int c; 243 244 if (dg.dma_tag != NULL) 245 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD); 246 247 c = dcons_check_break(dc, dcons_checkc(dc)); 248 249 if (dg.dma_tag != NULL) 250 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD); 251 252 return (c); 253 } 254 255 static int 256 dcons_os_getc(struct dcons_softc *dc) 257 { 258 int c; 259 260 while ((c = dcons_os_checkc(dc)) == -1); 261 262 return (c & 0xff); 263 } 264 265 static void 266 dcons_os_putc(struct dcons_softc *dc, int c) 267 { 268 if (dg.dma_tag != NULL) 269 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE); 270 271 dcons_putc(dc, c); 272 273 if (dg.dma_tag != NULL) 274 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE); 275 } 276 static int 277 dcons_open(DEV dev, int flag, int mode, THREAD *td) 278 { 279 struct tty *tp; 280 int unit, error, s; 281 282 unit = minor(dev); 283 if (unit != 0) 284 return (ENXIO); 285 286 tp = dev->si_tty = ttymalloc(dev->si_tty); 287 tp->t_oproc = dcons_tty_start; 288 tp->t_param = dcons_tty_param; 289 tp->t_stop = nottystop; 290 tp->t_dev = dev; 291 292 error = 0; 293 294 s = spltty(); 295 if ((tp->t_state & TS_ISOPEN) == 0) { 296 tp->t_state |= TS_CARR_ON; 297 ttychars(tp); 298 tp->t_iflag = TTYDEF_IFLAG; 299 tp->t_oflag = TTYDEF_OFLAG; 300 tp->t_cflag = TTYDEF_CFLAG|CLOCAL; 301 tp->t_lflag = TTYDEF_LFLAG; 302 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 303 ttsetwater(tp); 304 } else if ((tp->t_state & TS_XCLUDE) && suser(td)) { 305 splx(s); 306 return (EBUSY); 307 } 308 splx(s); 309 310 #if __FreeBSD_version < 502113 311 error = (*linesw[tp->t_line].l_open)(dev, tp); 312 #else 313 error = ttyld_open(tp, dev); 314 #endif 315 316 return (error); 317 } 318 319 static int 320 dcons_close(DEV dev, int flag, int mode, THREAD *td) 321 { 322 int unit; 323 struct tty *tp; 324 325 unit = minor(dev); 326 if (unit != 0) 327 return (ENXIO); 328 329 tp = dev->si_tty; 330 if (tp->t_state & TS_ISOPEN) { 331 #if __FreeBSD_version < 502113 332 (*linesw[tp->t_line].l_close)(tp, flag); 333 ttyclose(tp); 334 #else 335 ttyld_close(tp, flag); 336 tty_close(tp); 337 #endif 338 } 339 340 return (0); 341 } 342 343 #if defined(__DragonFly__) || __FreeBSD_version < 500104 344 static int 345 dcons_ioctl(DEV dev, u_long cmd, caddr_t data, int flag, THREAD *td) 346 { 347 int unit; 348 struct tty *tp; 349 int error; 350 351 unit = minor(dev); 352 if (unit != 0) 353 return (ENXIO); 354 355 tp = dev->si_tty; 356 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td); 357 if (error != ENOIOCTL) 358 return (error); 359 360 error = ttioctl(tp, cmd, data, flag); 361 if (error != ENOIOCTL) 362 return (error); 363 364 return (ENOTTY); 365 } 366 #endif 367 368 static int 369 dcons_tty_param(struct tty *tp, struct termios *t) 370 { 371 tp->t_ispeed = t->c_ispeed; 372 tp->t_ospeed = t->c_ospeed; 373 tp->t_cflag = t->c_cflag; 374 return 0; 375 } 376 377 static void 378 dcons_tty_start(struct tty *tp) 379 { 380 struct dcons_softc *dc; 381 int s; 382 383 dc = (struct dcons_softc *)tp->t_dev->si_drv1; 384 s = spltty(); 385 if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) { 386 ttwwakeup(tp); 387 return; 388 } 389 390 tp->t_state |= TS_BUSY; 391 while (tp->t_outq.c_cc != 0) 392 dcons_os_putc(dc, getc(&tp->t_outq)); 393 tp->t_state &= ~TS_BUSY; 394 395 ttwwakeup(tp); 396 splx(s); 397 } 398 399 static void 400 dcons_timeout(void *v) 401 { 402 struct tty *tp; 403 struct dcons_softc *dc; 404 int i, c, polltime; 405 406 for (i = 0; i < DCONS_NPORT; i ++) { 407 dc = &sc[i]; 408 tp = ((DEV)dc->dev)->si_tty; 409 while ((c = dcons_os_checkc(dc)) != -1) 410 if (tp->t_state & TS_ISOPEN) 411 #if __FreeBSD_version < 502113 412 (*linesw[tp->t_line].l_rint)(c, tp); 413 #else 414 ttyld_rint(tp, c); 415 #endif 416 } 417 polltime = hz / poll_hz; 418 if (polltime < 1) 419 polltime = 1; 420 callout_reset(&dcons_callout, polltime, dcons_timeout, tp); 421 } 422 423 static void 424 dcons_cnprobe(struct consdev *cp) 425 { 426 #ifdef __DragonFly__ 427 cp->cn_dev = make_dev(&dcons_cdevsw, DCONS_CON, 428 UID_ROOT, GID_WHEEL, 0600, "dcons"); 429 #elif __FreeBSD_version >= 501109 430 sprintf(cp->cn_name, "dcons"); 431 #else 432 cp->cn_dev = makedev(CDEV_MAJOR, DCONS_CON); 433 #endif 434 #if DCONS_FORCE_CONSOLE 435 cp->cn_pri = CN_REMOTE; 436 #else 437 cp->cn_pri = CN_NORMAL; 438 #endif 439 } 440 441 static void 442 dcons_cninit(struct consdev *cp) 443 { 444 dcons_drv_init(0); 445 #if CONS_NODEV 446 cp->cn_arg 447 #else 448 cp->cn_dev->si_drv1 449 #endif 450 = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */ 451 } 452 453 #if CONS_NODEV 454 static int 455 dcons_cngetc(struct consdev *cp) 456 { 457 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 458 return (dcons_os_getc(dc)); 459 } 460 static int 461 dcons_cncheckc(struct consdev *cp) 462 { 463 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 464 return (dcons_os_checkc(dc)); 465 } 466 static void 467 dcons_cnputc(struct consdev *cp, int c) 468 { 469 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 470 dcons_os_putc(dc, c); 471 } 472 #else 473 static int 474 dcons_cngetc(DEV dev) 475 { 476 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 477 return (dcons_os_getc(dc)); 478 } 479 static int 480 dcons_cncheckc(DEV dev) 481 { 482 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 483 return (dcons_os_checkc(dc)); 484 } 485 static void 486 dcons_cnputc(DEV dev, int c) 487 { 488 struct dcons_softc *dc = (struct dcons_softc *)dev->si_drv1; 489 dcons_os_putc(dc, c); 490 } 491 #endif 492 493 static int 494 dcons_drv_init(int stage) 495 { 496 int addr, size; 497 498 if (drv_init) 499 return(drv_init); 500 501 drv_init = -1; 502 503 bzero(&dg, sizeof(dg)); 504 dcons_conf = &dg; 505 dg.cdev = &dcons_consdev; 506 dg.buf = NULL; 507 dg.size = DCONS_BUF_SIZE; 508 509 #ifdef __i386__ 510 if (getenv_int("dcons.addr", &addr) > 0 && 511 getenv_int("dcons.size", &size) > 0) { 512 /* XXX P to V */ 513 dg.buf = (struct dcons_buf *)(KERNBASE + addr); 514 dg.size = size; 515 if (dcons_load_buffer(dg.buf, dg.size, sc) < 0) 516 dg.buf = NULL; 517 } 518 #endif 519 if (dg.buf != NULL) 520 goto ok; 521 522 #ifndef KLD_MODULE 523 if (stage == 0) { /* XXX or cold */ 524 /* 525 * DCONS_FORCE_CONSOLE == 1 and statically linked. 526 * called from cninit(). can't use contigmalloc yet . 527 */ 528 dg.buf = (struct dcons_buf *) bssbuf; 529 dcons_init(dg.buf, dg.size, sc); 530 } else 531 #endif 532 { 533 /* 534 * DCONS_FORCE_CONSOLE == 0 or kernel module case. 535 * if the module is loaded after boot, 536 * bssbuf could be non-continuous. 537 */ 538 dg.buf = (struct dcons_buf *) contigmalloc(dg.size, 539 M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul); 540 dcons_init(dg.buf, dg.size, sc); 541 } 542 543 ok: 544 dcons_buf = dg.buf; 545 546 #if __FreeBSD_version < 502122 547 #if DDB && DCONS_FORCE_GDB 548 #if CONS_NODEV 549 gdbconsdev.cn_arg = (void *)&sc[DCONS_GDB]; 550 #if __FreeBSD_version >= 501109 551 sprintf(gdbconsdev.cn_name, "dgdb"); 552 #endif 553 gdb_arg = &gdbconsdev; 554 #elif defined(__DragonFly__) 555 gdbdev = make_dev(&dcons_cdevsw, DCONS_GDB, 556 UID_ROOT, GID_WHEEL, 0600, "dgdb"); 557 #else 558 gdbdev = makedev(CDEV_MAJOR, DCONS_GDB); 559 #endif 560 gdb_getc = dcons_cngetc; 561 gdb_putc = dcons_cnputc; 562 #endif 563 #endif 564 drv_init = 1; 565 566 return 0; 567 } 568 569 570 static int 571 dcons_attach_port(int port, char *name, int flags) 572 { 573 struct dcons_softc *dc; 574 struct tty *tp; 575 DEV dev; 576 577 dc = &sc[port]; 578 dc->flags = flags; 579 dev = make_dev(&dcons_cdevsw, port, 580 UID_ROOT, GID_WHEEL, 0600, name); 581 dc->dev = (void *)dev; 582 tp = ttymalloc(NULL); 583 584 dev->si_drv1 = (void *)dc; 585 dev->si_tty = tp; 586 587 tp->t_oproc = dcons_tty_start; 588 tp->t_param = dcons_tty_param; 589 tp->t_stop = nottystop; 590 tp->t_dev = dc->dev; 591 592 return(0); 593 } 594 595 static int 596 dcons_attach(void) 597 { 598 int polltime; 599 600 #ifdef __DragonFly__ 601 cdevsw_add(&dcons_cdevsw, -1, 0); 602 #endif 603 dcons_attach_port(DCONS_CON, "dcons", 0); 604 dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB); 605 #if __FreeBSD_version < 500000 606 callout_init(&dcons_callout); 607 #else 608 callout_init(&dcons_callout, 0); 609 #endif 610 polltime = hz / poll_hz; 611 if (polltime < 1) 612 polltime = 1; 613 callout_reset(&dcons_callout, polltime, dcons_timeout, NULL); 614 return(0); 615 } 616 617 static int 618 dcons_detach(int port) 619 { 620 struct tty *tp; 621 struct dcons_softc *dc; 622 623 dc = &sc[port]; 624 625 tp = ((DEV)dc->dev)->si_tty; 626 627 if (tp->t_state & TS_ISOPEN) { 628 printf("dcons: still opened\n"); 629 #if __FreeBSD_version < 502113 630 (*linesw[tp->t_line].l_close)(tp, 0); 631 tp->t_gen++; 632 ttyclose(tp); 633 ttwakeup(tp); 634 ttwwakeup(tp); 635 #else 636 ttyld_close(tp, 0); 637 tty_close(tp); 638 #endif 639 } 640 /* XXX 641 * must wait until all device are closed. 642 */ 643 #ifdef __DragonFly__ 644 tsleep((void *)dc, 0, "dcodtc", hz/4); 645 #else 646 tsleep((void *)dc, PWAIT, "dcodtc", hz/4); 647 #endif 648 destroy_dev(dc->dev); 649 650 return(0); 651 } 652 653 654 /* cnXXX works only for FreeBSD-5 */ 655 static int 656 dcons_modevent(module_t mode, int type, void *data) 657 { 658 int err = 0, ret; 659 660 switch (type) { 661 case MOD_LOAD: 662 ret = dcons_drv_init(1); 663 dcons_attach(); 664 #if __FreeBSD_version >= 500000 665 if (ret == 0) { 666 dcons_cnprobe(&dcons_consdev); 667 dcons_cninit(&dcons_consdev); 668 cnadd(&dcons_consdev); 669 } 670 #endif 671 break; 672 case MOD_UNLOAD: 673 printf("dcons: unload\n"); 674 callout_stop(&dcons_callout); 675 #if __FreeBSD_version < 502122 676 #if DDB && DCONS_FORCE_GDB 677 #if CONS_NODEV 678 gdb_arg = NULL; 679 #else 680 gdbdev = 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 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