com.c revision 1.143
1 /* $NetBSD: com.c,v 1.143 1998/03/22 00:55:37 mycroft Exp $ */ 2 3 /*- 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998 5 * Charles M. Hannum. All rights reserved. 6 * 7 * Interrupt processing and hardware flow control partly based on code from 8 * Onno van der Linden and Gordon Ross. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Charles M. Hannum. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * Copyright (c) 1991 The Regents of the University of California. 38 * All rights reserved. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. All advertising materials mentioning features or use of this software 49 * must display the following acknowledgement: 50 * This product includes software developed by the University of 51 * California, Berkeley and its contributors. 52 * 4. Neither the name of the University nor the names of its contributors 53 * may be used to endorse or promote products derived from this software 54 * without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 * SUCH DAMAGE. 67 * 68 * @(#)com.c 7.5 (Berkeley) 5/16/91 69 */ 70 71 /* 72 * COM driver, uses National Semiconductor NS16450/NS16550AF UART 73 * Supports automatic hardware flow control on StarTech ST16C650A UART 74 */ 75 76 #include "rnd.h" 77 #if NRND > 0 && defined(RND_COM) 78 #include <sys/rnd.h> 79 #endif 80 81 #include <sys/param.h> 82 #include <sys/systm.h> 83 #include <sys/ioctl.h> 84 #include <sys/select.h> 85 #include <sys/tty.h> 86 #include <sys/proc.h> 87 #include <sys/user.h> 88 #include <sys/conf.h> 89 #include <sys/file.h> 90 #include <sys/uio.h> 91 #include <sys/kernel.h> 92 #include <sys/syslog.h> 93 #include <sys/types.h> 94 #include <sys/device.h> 95 #include <sys/malloc.h> 96 97 #include <machine/intr.h> 98 #include <machine/bus.h> 99 100 #include <dev/ic/comreg.h> 101 #include <dev/ic/comvar.h> 102 #include <dev/ic/ns16550reg.h> 103 #include <dev/ic/st16650reg.h> 104 #ifdef COM_HAYESP 105 #include <dev/ic/hayespreg.h> 106 #endif 107 #define com_lcr com_cfcr 108 #include <dev/cons.h> 109 110 #include "com.h" 111 112 #ifdef COM_HAYESP 113 int comprobeHAYESP __P((bus_space_handle_t hayespioh, struct com_softc *sc)); 114 #endif 115 116 #if defined(DDB) || defined(KGDB) 117 static void com_enable_debugport __P((struct com_softc *)); 118 #endif 119 void com_attach_subr __P((struct com_softc *sc)); 120 void com_config __P((struct com_softc *)); 121 void com_shutdown __P((struct com_softc *)); 122 int comspeed __P((long, long)); 123 static u_char cflag2lcr __P((tcflag_t)); 124 int comparam __P((struct tty *, struct termios *)); 125 void comstart __P((struct tty *)); 126 void comstop __P((struct tty *, int)); 127 int comhwiflow __P((struct tty *, int)); 128 129 void com_loadchannelregs __P((struct com_softc *)); 130 void com_hwiflow __P((struct com_softc *)); 131 void com_break __P((struct com_softc *, int)); 132 void com_modem __P((struct com_softc *, int)); 133 void com_iflush __P((struct com_softc *)); 134 135 int com_common_getc __P((bus_space_tag_t, bus_space_handle_t)); 136 void com_common_putc __P((bus_space_tag_t, bus_space_handle_t, int)); 137 138 /* XXX: These belong elsewhere */ 139 cdev_decl(com); 140 bdev_decl(com); 141 142 int comcngetc __P((dev_t)); 143 void comcnputc __P((dev_t, int)); 144 void comcnpollc __P((dev_t, int)); 145 146 #define integrate static inline 147 #ifdef __GENERIC_SOFT_INTERRUPTS 148 void comsoft __P((void *)); 149 #else 150 #ifndef __NO_SOFT_SERIAL_INTERRUPT 151 void comsoft __P((void)); 152 #else 153 void comsoft __P((void *)); 154 #endif 155 #endif 156 integrate void com_rxsoft __P((struct com_softc *, struct tty *)); 157 integrate void com_txsoft __P((struct com_softc *, struct tty *)); 158 integrate void com_stsoft __P((struct com_softc *, struct tty *)); 159 integrate void com_schedrx __P((struct com_softc *)); 160 void comdiag __P((void *)); 161 162 extern struct cfdriver com_cd; 163 164 /* 165 * Make this an option variable one can patch. 166 * But be warned: this must be a power of 2! 167 */ 168 u_int com_rbuf_size = COM_RING_SIZE; 169 170 /* Stop input when 3/4 of the ring is full; restart when only 1/4 is full. */ 171 u_int com_rbuf_hiwat = (COM_RING_SIZE * 1) / 4; 172 u_int com_rbuf_lowat = (COM_RING_SIZE * 3) / 4; 173 174 static int comconsaddr; 175 static bus_space_tag_t comconstag; 176 static bus_space_handle_t comconsioh; 177 static int comconsattached; 178 static int comconsrate; 179 static tcflag_t comconscflag; 180 181 static u_char tiocm_xxx2mcr __P((int)); 182 183 #ifndef __GENERIC_SOFT_INTERRUPTS 184 #ifdef __NO_SOFT_SERIAL_INTERRUPT 185 volatile int com_softintr_scheduled; 186 #endif 187 #endif 188 189 #ifdef KGDB 190 #include <sys/kgdb.h> 191 192 static int com_kgdb_addr; 193 static bus_space_tag_t com_kgdb_iot; 194 static bus_space_handle_t com_kgdb_ioh; 195 static int com_kgdb_attached; 196 197 int com_kgdb_getc __P((void *)); 198 void com_kgdb_putc __P((void *, int)); 199 #endif /* KGDB */ 200 201 #define COMUNIT(x) (minor(x) & 0x7ffff) 202 #define COMDIALOUT(x) (minor(x) & 0x80000) 203 204 int 205 comspeed(speed, frequency) 206 long speed, frequency; 207 { 208 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 209 210 int x, err; 211 212 #if 0 213 if (speed == 0) 214 return (0); 215 #endif 216 if (speed <= 0) 217 return (-1); 218 x = divrnd(frequency / 16, speed); 219 if (x <= 0) 220 return (-1); 221 err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000; 222 if (err < 0) 223 err = -err; 224 if (err > COM_TOLERANCE) 225 return (-1); 226 return (x); 227 228 #undef divrnd(n, q) 229 } 230 231 #ifdef COM_DEBUG 232 int com_debug = 0; 233 234 void comstatus __P((struct com_softc *, char *)); 235 void 236 comstatus(sc, str) 237 struct com_softc *sc; 238 char *str; 239 { 240 struct tty *tp = sc->sc_tty; 241 242 printf("%s: %s %sclocal %sdcd %sts_carr_on %sdtr %stx_stopped\n", 243 sc->sc_dev.dv_xname, str, 244 ISSET(tp->t_cflag, CLOCAL) ? "+" : "-", 245 ISSET(sc->sc_msr, MSR_DCD) ? "+" : "-", 246 ISSET(tp->t_state, TS_CARR_ON) ? "+" : "-", 247 ISSET(sc->sc_mcr, MCR_DTR) ? "+" : "-", 248 sc->sc_tx_stopped ? "+" : "-"); 249 250 printf("%s: %s %scrtscts %scts %sts_ttstop %srts %xrx_flags\n", 251 sc->sc_dev.dv_xname, str, 252 ISSET(tp->t_cflag, CRTSCTS) ? "+" : "-", 253 ISSET(sc->sc_msr, MSR_CTS) ? "+" : "-", 254 ISSET(tp->t_state, TS_TTSTOP) ? "+" : "-", 255 ISSET(sc->sc_mcr, MCR_RTS) ? "+" : "-", 256 sc->sc_rx_flags); 257 } 258 #endif 259 260 int 261 comprobe1(iot, ioh, iobase) 262 bus_space_tag_t iot; 263 bus_space_handle_t ioh; 264 int iobase; 265 { 266 267 /* force access to id reg */ 268 bus_space_write_1(iot, ioh, com_lcr, 0); 269 bus_space_write_1(iot, ioh, com_iir, 0); 270 if (bus_space_read_1(iot, ioh, com_iir) & 0x38) 271 return (0); 272 273 return (1); 274 } 275 276 #ifdef COM_HAYESP 277 int 278 comprobeHAYESP(hayespioh, sc) 279 bus_space_handle_t hayespioh; 280 struct com_softc *sc; 281 { 282 char val, dips; 283 int combaselist[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 }; 284 bus_space_tag_t iot = sc->sc_iot; 285 286 /* 287 * Hayes ESP cards have two iobases. One is for compatibility with 288 * 16550 serial chips, and at the same ISA PC base addresses. The 289 * other is for ESP-specific enhanced features, and lies at a 290 * different addressing range entirely (0x140, 0x180, 0x280, or 0x300). 291 */ 292 293 /* Test for ESP signature */ 294 if ((bus_space_read_1(iot, hayespioh, 0) & 0xf3) == 0) 295 return (0); 296 297 /* 298 * ESP is present at ESP enhanced base address; unknown com port 299 */ 300 301 /* Get the dip-switch configurations */ 302 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETDIPS); 303 dips = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); 304 305 /* Determine which com port this ESP card services: bits 0,1 of */ 306 /* dips is the port # (0-3); combaselist[val] is the com_iobase */ 307 if (sc->sc_iobase != combaselist[dips & 0x03]) 308 return (0); 309 310 printf(": ESP"); 311 312 /* Check ESP Self Test bits. */ 313 /* Check for ESP version 2.0: bits 4,5,6 == 010 */ 314 bus_space_write_1(iot, hayespioh, HAYESP_CMD1, HAYESP_GETTEST); 315 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS1); /* Clear reg1 */ 316 val = bus_space_read_1(iot, hayespioh, HAYESP_STATUS2); 317 if ((val & 0x70) < 0x20) { 318 printf("-old (%o)", val & 0x70); 319 /* we do not support the necessary features */ 320 return (0); 321 } 322 323 /* Check for ability to emulate 16550: bit 8 == 1 */ 324 if ((dips & 0x80) == 0) { 325 printf(" slave"); 326 /* XXX Does slave really mean no 16550 support?? */ 327 return (0); 328 } 329 330 /* 331 * If we made it this far, we are a full-featured ESP v2.0 (or 332 * better), at the correct com port address. 333 */ 334 335 SET(sc->sc_hwflags, COM_HW_HAYESP); 336 printf(", 1024 byte fifo\n"); 337 return (1); 338 } 339 #endif 340 341 #if defined(DDB) || defined(KGDB) 342 static void 343 com_enable_debugport(sc) 344 struct com_softc *sc; 345 { 346 int s; 347 348 /* Turn on line break interrupt, set carrier. */ 349 s = splserial(); 350 sc->sc_ier = IER_ERXRDY; 351 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 352 SET(sc->sc_mcr, MCR_DTR | MCR_RTS); 353 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 354 splx(s); 355 } 356 #endif 357 358 void 359 com_attach_subr(sc) 360 struct com_softc *sc; 361 { 362 int iobase = sc->sc_iobase; 363 bus_space_tag_t iot = sc->sc_iot; 364 bus_space_handle_t ioh = sc->sc_ioh; 365 struct tty *tp; 366 #ifdef COM16650 367 u_int8_t lcr; 368 #endif 369 #ifdef COM_HAYESP 370 int hayesp_ports[] = { 0x140, 0x180, 0x280, 0x300, 0 }; 371 int *hayespp; 372 #endif 373 374 /* Disable interrupts before configuring the device. */ 375 sc->sc_ier = 0; 376 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 377 378 if (iot == comconstag && iobase == comconsaddr) { 379 comconsattached = 1; 380 381 /* Make sure the console is always "hardwired". */ 382 delay(1000); /* wait for output to finish */ 383 SET(sc->sc_hwflags, COM_HW_CONSOLE); 384 SET(sc->sc_swflags, TIOCFLAG_SOFTCAR); 385 } 386 387 #ifdef COM_HAYESP 388 /* Look for a Hayes ESP board. */ 389 for (hayespp = hayesp_ports; *hayespp != 0; hayespp++) { 390 bus_space_handle_t hayespioh; 391 392 #define HAYESP_NPORTS 8 /* XXX XXX XXX ??? ??? ??? */ 393 if (bus_space_map(iot, *hayespp, HAYESP_NPORTS, 0, &hayespioh)) 394 continue; 395 if (comprobeHAYESP(hayespioh, sc)) { 396 sc->sc_hayespioh = hayespioh; 397 sc->sc_fifolen = 1024; 398 399 break; 400 } 401 bus_space_unmap(iot, hayespioh, HAYESP_NPORTS); 402 } 403 /* No ESP; look for other things. */ 404 if (!ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 405 #endif 406 sc->sc_fifolen = 1; 407 /* look for a NS 16550AF UART with FIFOs */ 408 bus_space_write_1(iot, ioh, com_fifo, 409 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); 410 delay(100); 411 if (ISSET(bus_space_read_1(iot, ioh, com_iir), IIR_FIFO_MASK) 412 == IIR_FIFO_MASK) 413 if (ISSET(bus_space_read_1(iot, ioh, com_fifo), FIFO_TRIGGER_14) 414 == FIFO_TRIGGER_14) { 415 SET(sc->sc_hwflags, COM_HW_FIFO); 416 417 #ifdef COM16650 418 /* 419 * IIR changes into the EFR if LCR is set to LCR_EERS 420 * on 16650s. We also know IIR != 0 at this point. 421 * Write 0 into the EFR, and read it. If the result 422 * is 0, we have a 16650. 423 * 424 * Older 16650s were broken; the test to detect them 425 * is taken from the Linux driver. Apparently 426 * setting DLAB enable gives access to the EFR on 427 * these chips. 428 */ 429 lcr = bus_space_read_1(iot, ioh, com_lcr); 430 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 431 bus_space_write_1(iot, ioh, com_efr, 0); 432 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 433 bus_space_write_1(iot, ioh, com_lcr, 434 lcr | LCR_DLAB); 435 if (bus_space_read_1(iot, ioh, com_efr) == 0) { 436 CLR(sc->sc_hwflags, COM_HW_FIFO); 437 sc->sc_fifolen = 0; 438 } else { 439 SET(sc->sc_hwflags, COM_HW_FLOW); 440 sc->sc_fifolen = 32; 441 } 442 } else 443 #endif 444 sc->sc_fifolen = 16; 445 446 #ifdef COM16650 447 bus_space_write_1(iot, ioh, com_lcr, lcr); 448 if (sc->sc_fifolen == 0) 449 printf(": st16650, broken fifo\n"); 450 else if (sc->sc_fifolen == 32) 451 printf(": st16650a, working fifo\n"); 452 else 453 #endif 454 printf(": ns16550a, working fifo\n"); 455 } else 456 printf(": ns16550, broken fifo\n"); 457 else 458 printf(": ns8250 or ns16450, no fifo\n"); 459 bus_space_write_1(iot, ioh, com_fifo, 0); 460 #ifdef COM_HAYESP 461 } 462 #endif 463 464 tp = ttymalloc(); 465 tp->t_oproc = comstart; 466 tp->t_param = comparam; 467 tp->t_hwiflow = comhwiflow; 468 tty_attach(tp); 469 470 sc->sc_tty = tp; 471 sc->sc_rbuf = malloc(com_rbuf_size << 1, M_DEVBUF, M_WAITOK); 472 sc->sc_ebuf = sc->sc_rbuf + (com_rbuf_size << 1); 473 474 if (!ISSET(sc->sc_hwflags, COM_HW_NOIEN)) 475 SET(sc->sc_mcr, MCR_IENABLE); 476 477 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 478 int maj; 479 480 /* locate the major number */ 481 for (maj = 0; maj < nchrdev; maj++) 482 if (cdevsw[maj].d_open == comopen) 483 break; 484 485 cn_tab->cn_dev = makedev(maj, sc->sc_dev.dv_unit); 486 487 printf("%s: console\n", sc->sc_dev.dv_xname); 488 } 489 490 #ifdef KGDB 491 /* 492 * Allow kgdb to "take over" this port. If this is 493 * the kgdb device, it has exclusive use. 494 */ 495 if (iot == com_kgdb_iot && iobase == com_kgdb_addr) { 496 com_kgdb_attached = 1; 497 498 SET(sc->sc_hwflags, COM_HW_KGDB); 499 printf("%s: kgdb\n", sc->sc_dev.dv_xname); 500 } 501 #endif 502 503 #ifdef __GENERIC_SOFT_INTERRUPTS 504 sc->sc_si = softintr_establish(IPL_SOFTSERIAL, comsoft, sc); 505 #endif 506 507 #if NRND > 0 && defined(RND_COM) 508 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 509 RND_TYPE_TTY); 510 #endif 511 512 /* if there are no enable/disable functions, assume the device 513 is always enabled */ 514 if (!sc->enable) 515 sc->enabled = 1; 516 517 com_config(sc); 518 519 SET(sc->sc_hwflags, COM_HW_DEV_OK); 520 } 521 522 void 523 com_config(sc) 524 struct com_softc *sc; 525 { 526 bus_space_tag_t iot = sc->sc_iot; 527 bus_space_handle_t ioh = sc->sc_ioh; 528 529 /* Disable interrupts before configuring the device. */ 530 sc->sc_ier = 0; 531 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 532 533 #ifdef COM_HAYESP 534 /* Look for a Hayes ESP board. */ 535 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) { 536 sc->sc_fifolen = 1024; 537 538 /* Set 16550 compatibility mode */ 539 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 540 HAYESP_SETMODE); 541 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 542 HAYESP_MODE_FIFO|HAYESP_MODE_RTS| 543 HAYESP_MODE_SCALE); 544 545 /* Set RTS/CTS flow control */ 546 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 547 HAYESP_SETFLOWTYPE); 548 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 549 HAYESP_FLOW_RTS); 550 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 551 HAYESP_FLOW_CTS); 552 553 /* Set flow control levels */ 554 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD1, 555 HAYESP_SETRXFLOW); 556 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 557 HAYESP_HIBYTE(HAYESP_RXHIWMARK)); 558 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 559 HAYESP_LOBYTE(HAYESP_RXHIWMARK)); 560 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 561 HAYESP_HIBYTE(HAYESP_RXLOWMARK)); 562 bus_space_write_1(iot, sc->sc_hayespioh, HAYESP_CMD2, 563 HAYESP_LOBYTE(HAYESP_RXLOWMARK)); 564 } 565 #endif 566 567 #ifdef DDB 568 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 569 com_enable_debugport(sc); 570 #endif 571 572 #ifdef KGDB 573 /* 574 * Allow kgdb to "take over" this port. If this is 575 * the kgdb device, it has exclusive use. 576 */ 577 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 578 com_enable_debugport(sc); 579 #endif 580 } 581 582 void 583 com_shutdown(sc) 584 struct com_softc *sc; 585 { 586 struct tty *tp = sc->sc_tty; 587 int s; 588 589 s = splserial(); 590 591 /* If we were asserting flow control, then deassert it. */ 592 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 593 com_hwiflow(sc); 594 595 /* Clear any break condition set with TIOCSBRK. */ 596 com_break(sc, 0); 597 598 /* 599 * Hang up if necessary. Wait a bit, so the other side has time to 600 * notice even if we immediately open the port again. 601 */ 602 if (ISSET(tp->t_cflag, HUPCL)) { 603 com_modem(sc, 0); 604 (void) tsleep(sc, TTIPRI, ttclos, hz); 605 } 606 607 /* Turn off interrupts. */ 608 #ifdef DDB 609 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) 610 sc->sc_ier = IER_ERXRDY; /* interrupt on break */ 611 else 612 #endif 613 sc->sc_ier = 0; 614 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 615 616 if (sc->disable) { 617 #ifdef DIAGNOSTIC 618 if (!sc->enabled) 619 panic("com_shutdown: not enabled?"); 620 #endif 621 (*sc->disable)(sc); 622 sc->enabled = 0; 623 } 624 625 splx(s); 626 } 627 628 int 629 comopen(dev, flag, mode, p) 630 dev_t dev; 631 int flag, mode; 632 struct proc *p; 633 { 634 int unit = COMUNIT(dev); 635 struct com_softc *sc; 636 struct tty *tp; 637 int s, s2; 638 int error; 639 640 if (unit >= com_cd.cd_ndevs) 641 return (ENXIO); 642 sc = com_cd.cd_devs[unit]; 643 if (sc == 0 || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK)) 644 return (ENXIO); 645 646 #ifdef KGDB 647 /* 648 * If this is the kgdb port, no other use is permitted. 649 */ 650 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) 651 return (EBUSY); 652 #endif 653 654 tp = sc->sc_tty; 655 656 if (ISSET(tp->t_state, TS_ISOPEN) && 657 ISSET(tp->t_state, TS_XCLUDE) && 658 p->p_ucred->cr_uid != 0) 659 return (EBUSY); 660 661 s = spltty(); 662 663 /* 664 * Do the following iff this is a first open. 665 */ 666 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 667 struct termios t; 668 669 tp->t_dev = dev; 670 671 s2 = splserial(); 672 673 if (sc->enable) { 674 if ((*sc->enable)(sc)) { 675 splx(s2); 676 splx(s); 677 printf("%s: device enable failed\n", 678 sc->sc_dev.dv_xname); 679 return (EIO); 680 } 681 sc->enabled = 1; 682 com_config(sc); 683 } 684 685 /* Turn on interrupts. */ 686 sc->sc_ier = IER_ERXRDY | IER_ERLS | IER_EMSC; 687 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 688 689 /* Fetch the current modem control status, needed later. */ 690 sc->sc_msr = bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_msr); 691 692 splx(s2); 693 694 /* 695 * Initialize the termios status to the defaults. Add in the 696 * sticky bits from TIOCSFLAGS. 697 */ 698 t.c_ispeed = 0; 699 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 700 t.c_ospeed = comconsrate; 701 t.c_cflag = comconscflag; 702 } else { 703 t.c_ospeed = TTYDEF_SPEED; 704 t.c_cflag = TTYDEF_CFLAG; 705 } 706 if (ISSET(sc->sc_swflags, TIOCFLAG_CLOCAL)) 707 SET(t.c_cflag, CLOCAL); 708 if (ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) 709 SET(t.c_cflag, CRTSCTS); 710 if (ISSET(sc->sc_swflags, TIOCFLAG_MDMBUF)) 711 SET(t.c_cflag, MDMBUF); 712 /* Make sure comparam() will do something. */ 713 tp->t_ospeed = 0; 714 (void) comparam(tp, &t); 715 tp->t_iflag = TTYDEF_IFLAG; 716 tp->t_oflag = TTYDEF_OFLAG; 717 tp->t_lflag = TTYDEF_LFLAG; 718 ttychars(tp); 719 ttsetwater(tp); 720 721 s2 = splserial(); 722 723 /* 724 * Turn on DTR. We must always do this, even if carrier is not 725 * present, because otherwise we'd have to use TIOCSDTR 726 * immediately after setting CLOCAL, which applications do not 727 * expect. We always assert DTR while the device is open 728 * unless explicitly requested to deassert it. 729 */ 730 com_modem(sc, 1); 731 732 /* Clear the input ring, and unblock. */ 733 sc->sc_rbput = sc->sc_rbget = sc->sc_rbuf; 734 sc->sc_rbavail = com_rbuf_size; 735 com_iflush(sc); 736 CLR(sc->sc_rx_flags, RX_ANY_BLOCK); 737 com_hwiflow(sc); 738 739 #ifdef COM_DEBUG 740 if (com_debug) 741 comstatus(sc, "comopen "); 742 #endif 743 744 splx(s2); 745 } 746 747 splx(s); 748 749 error = ttyopen(tp, COMDIALOUT(dev), ISSET(flag, O_NONBLOCK)); 750 if (error) 751 goto bad; 752 753 error = (*linesw[tp->t_line].l_open)(dev, tp); 754 if (error) 755 goto bad; 756 757 return (0); 758 759 bad: 760 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 761 /* 762 * We failed to open the device, and nobody else had it opened. 763 * Clean up the state as appropriate. 764 */ 765 com_shutdown(sc); 766 } 767 768 return (error); 769 } 770 771 int 772 comclose(dev, flag, mode, p) 773 dev_t dev; 774 int flag, mode; 775 struct proc *p; 776 { 777 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 778 struct tty *tp = sc->sc_tty; 779 780 /* XXX This is for cons.c. */ 781 if (!ISSET(tp->t_state, TS_ISOPEN)) 782 return (0); 783 784 (*linesw[tp->t_line].l_close)(tp, flag); 785 ttyclose(tp); 786 787 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) { 788 /* 789 * Although we got a last close, the device may still be in 790 * use; e.g. if this was the dialout node, and there are still 791 * processes waiting for carrier on the non-dialout node. 792 */ 793 com_shutdown(sc); 794 } 795 796 return (0); 797 } 798 799 int 800 comread(dev, uio, flag) 801 dev_t dev; 802 struct uio *uio; 803 int flag; 804 { 805 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 806 struct tty *tp = sc->sc_tty; 807 808 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 809 } 810 811 int 812 comwrite(dev, uio, flag) 813 dev_t dev; 814 struct uio *uio; 815 int flag; 816 { 817 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 818 struct tty *tp = sc->sc_tty; 819 820 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 821 } 822 823 struct tty * 824 comtty(dev) 825 dev_t dev; 826 { 827 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 828 struct tty *tp = sc->sc_tty; 829 830 return (tp); 831 } 832 833 static u_char 834 tiocm_xxx2mcr(data) 835 int data; 836 { 837 u_char m = 0; 838 839 if (ISSET(data, TIOCM_DTR)) 840 SET(m, MCR_DTR); 841 if (ISSET(data, TIOCM_RTS)) 842 SET(m, MCR_RTS); 843 return m; 844 } 845 846 int 847 comioctl(dev, cmd, data, flag, p) 848 dev_t dev; 849 u_long cmd; 850 caddr_t data; 851 int flag; 852 struct proc *p; 853 { 854 struct com_softc *sc = com_cd.cd_devs[COMUNIT(dev)]; 855 struct tty *tp = sc->sc_tty; 856 int error; 857 int s; 858 859 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 860 if (error >= 0) 861 return (error); 862 863 error = ttioctl(tp, cmd, data, flag, p); 864 if (error >= 0) 865 return (error); 866 867 error = 0; 868 869 s = splserial(); 870 871 switch (cmd) { 872 case TIOCSBRK: 873 com_break(sc, 1); 874 break; 875 876 case TIOCCBRK: 877 com_break(sc, 0); 878 break; 879 880 case TIOCSDTR: 881 com_modem(sc, 1); 882 break; 883 884 case TIOCCDTR: 885 com_modem(sc, 0); 886 break; 887 888 case TIOCGFLAGS: 889 *(int *)data = sc->sc_swflags; 890 break; 891 892 case TIOCSFLAGS: 893 error = suser(p->p_ucred, &p->p_acflag); 894 if (error) 895 break; 896 sc->sc_swflags = *(int *)data; 897 break; 898 899 case TIOCMSET: 900 CLR(sc->sc_mcr, MCR_DTR | MCR_RTS); 901 /*FALLTHROUGH*/ 902 903 case TIOCMBIS: 904 SET(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 905 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 906 break; 907 908 case TIOCMBIC: 909 CLR(sc->sc_mcr, tiocm_xxx2mcr(*(int *)data)); 910 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_mcr, sc->sc_mcr); 911 break; 912 913 case TIOCMGET: { 914 u_char m; 915 int bits = 0; 916 917 m = sc->sc_mcr; 918 if (ISSET(m, MCR_DTR)) 919 SET(bits, TIOCM_DTR); 920 if (ISSET(m, MCR_RTS)) 921 SET(bits, TIOCM_RTS); 922 m = sc->sc_msr; 923 if (ISSET(m, MSR_DCD)) 924 SET(bits, TIOCM_CD); 925 if (ISSET(m, MSR_CTS)) 926 SET(bits, TIOCM_CTS); 927 if (ISSET(m, MSR_DSR)) 928 SET(bits, TIOCM_DSR); 929 if (ISSET(m, MSR_RI | MSR_TERI)) 930 SET(bits, TIOCM_RI); 931 if (bus_space_read_1(sc->sc_iot, sc->sc_ioh, com_ier)) 932 SET(bits, TIOCM_LE); 933 *(int *)data = bits; 934 break; 935 } 936 default: 937 error = ENOTTY; 938 break; 939 } 940 941 splx(s); 942 943 #ifdef COM_DEBUG 944 if (com_debug) 945 comstatus(sc, "comioctl "); 946 #endif 947 948 return (error); 949 } 950 951 integrate void 952 com_schedrx(sc) 953 struct com_softc *sc; 954 { 955 956 sc->sc_rx_ready = 1; 957 958 /* Wake up the poller. */ 959 #ifdef __GENERIC_SOFT_INTERRUPTS 960 softintr_schedule(sc->sc_si); 961 #else 962 #ifndef __NO_SOFT_SERIAL_INTERRUPT 963 setsoftserial(); 964 #else 965 if (!com_softintr_scheduled) { 966 com_softintr_scheduled = 1; 967 timeout(comsoft, NULL, 1); 968 } 969 #endif 970 #endif 971 } 972 973 void 974 com_break(sc, onoff) 975 struct com_softc *sc; 976 int onoff; 977 { 978 979 if (onoff) 980 SET(sc->sc_lcr, LCR_SBREAK); 981 else 982 CLR(sc->sc_lcr, LCR_SBREAK); 983 984 if (!sc->sc_heldchange) { 985 if (sc->sc_tx_busy) { 986 sc->sc_heldtbc = sc->sc_tbc; 987 sc->sc_tbc = 0; 988 sc->sc_heldchange = 1; 989 } else 990 com_loadchannelregs(sc); 991 } 992 } 993 994 void 995 com_modem(sc, onoff) 996 struct com_softc *sc; 997 int onoff; 998 { 999 1000 if (onoff) 1001 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1002 else 1003 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1004 1005 if (!sc->sc_heldchange) { 1006 if (sc->sc_tx_busy) { 1007 sc->sc_heldtbc = sc->sc_tbc; 1008 sc->sc_tbc = 0; 1009 sc->sc_heldchange = 1; 1010 } else 1011 com_loadchannelregs(sc); 1012 } 1013 } 1014 1015 static u_char 1016 cflag2lcr(cflag) 1017 tcflag_t cflag; 1018 { 1019 u_char lcr = 0; 1020 1021 switch (ISSET(cflag, CSIZE)) { 1022 case CS5: 1023 SET(lcr, LCR_5BITS); 1024 break; 1025 case CS6: 1026 SET(lcr, LCR_6BITS); 1027 break; 1028 case CS7: 1029 SET(lcr, LCR_7BITS); 1030 break; 1031 case CS8: 1032 SET(lcr, LCR_8BITS); 1033 break; 1034 } 1035 if (ISSET(cflag, PARENB)) { 1036 SET(lcr, LCR_PENAB); 1037 if (!ISSET(cflag, PARODD)) 1038 SET(lcr, LCR_PEVEN); 1039 } 1040 if (ISSET(cflag, CSTOPB)) 1041 SET(lcr, LCR_STOPB); 1042 1043 return (lcr); 1044 } 1045 1046 int 1047 comparam(tp, t) 1048 struct tty *tp; 1049 struct termios *t; 1050 { 1051 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1052 int ospeed = comspeed(t->c_ospeed, sc->sc_frequency); 1053 u_char lcr; 1054 int s; 1055 1056 /* Check requested parameters. */ 1057 if (ospeed < 0) 1058 return (EINVAL); 1059 if (t->c_ispeed && t->c_ispeed != t->c_ospeed) 1060 return (EINVAL); 1061 1062 /* 1063 * For the console, always force CLOCAL and !HUPCL, so that the port 1064 * is always active. 1065 */ 1066 if (ISSET(sc->sc_swflags, TIOCFLAG_SOFTCAR) || 1067 ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1068 SET(t->c_cflag, CLOCAL); 1069 CLR(t->c_cflag, HUPCL); 1070 } 1071 1072 /* 1073 * If there were no changes, don't do anything. This avoids dropping 1074 * input and improves performance when all we did was frob things like 1075 * VMIN and VTIME. 1076 */ 1077 if (tp->t_ospeed == t->c_ospeed && 1078 tp->t_cflag == t->c_cflag) 1079 return (0); 1080 1081 lcr = ISSET(sc->sc_lcr, LCR_SBREAK) | cflag2lcr(t->c_cflag); 1082 1083 s = splserial(); 1084 1085 sc->sc_lcr = lcr; 1086 1087 /* 1088 * If we're not in a mode that assumes a connection is present, then 1089 * ignore carrier changes. 1090 */ 1091 if (ISSET(t->c_cflag, CLOCAL | MDMBUF)) 1092 sc->sc_msr_dcd = 0; 1093 else 1094 sc->sc_msr_dcd = MSR_DCD; 1095 /* 1096 * Set the flow control pins depending on the current flow control 1097 * mode. 1098 */ 1099 if (ISSET(t->c_cflag, CRTSCTS)) { 1100 sc->sc_mcr_dtr = MCR_DTR; 1101 sc->sc_mcr_rts = MCR_RTS; 1102 sc->sc_msr_cts = MSR_CTS; 1103 sc->sc_efr = EFR_AUTORTS | EFR_AUTOCTS; 1104 } else if (ISSET(t->c_cflag, MDMBUF)) { 1105 /* 1106 * For DTR/DCD flow control, make sure we don't toggle DTR for 1107 * carrier detection. 1108 */ 1109 sc->sc_mcr_dtr = 0; 1110 sc->sc_mcr_rts = MCR_DTR; 1111 sc->sc_msr_cts = MSR_DCD; 1112 sc->sc_efr = 0; 1113 } else { 1114 /* 1115 * If no flow control, then always set RTS. This will make 1116 * the other side happy if it mistakenly thinks we're doing 1117 * RTS/CTS flow control. 1118 */ 1119 sc->sc_mcr_dtr = MCR_DTR | MCR_RTS; 1120 sc->sc_mcr_rts = 0; 1121 sc->sc_msr_cts = 0; 1122 sc->sc_efr = 0; 1123 if (ISSET(sc->sc_mcr, MCR_DTR)) 1124 SET(sc->sc_mcr, MCR_RTS); 1125 else 1126 CLR(sc->sc_mcr, MCR_RTS); 1127 } 1128 sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd; 1129 1130 #if 0 1131 if (ospeed == 0) 1132 CLR(sc->sc_mcr, sc->sc_mcr_dtr); 1133 else 1134 SET(sc->sc_mcr, sc->sc_mcr_dtr); 1135 #endif 1136 1137 sc->sc_dlbl = ospeed; 1138 sc->sc_dlbh = ospeed >> 8; 1139 1140 /* 1141 * Set the FIFO threshold based on the receive speed. 1142 * 1143 * * If it's a low speed, it's probably a mouse or some other 1144 * interactive device, so set the threshold low. 1145 * * If it's a high speed, trim the trigger level down to prevent 1146 * overflows. 1147 * * Otherwise set it a bit higher. 1148 */ 1149 if (ISSET(sc->sc_hwflags, COM_HW_HAYESP)) 1150 sc->sc_fifo = FIFO_DMA_MODE | FIFO_ENABLE | FIFO_TRIGGER_8; 1151 else if (ISSET(sc->sc_hwflags, COM_HW_FIFO)) 1152 sc->sc_fifo = FIFO_ENABLE | 1153 (t->c_ospeed <= 1200 ? FIFO_TRIGGER_1 : 1154 t->c_ospeed <= 38400 ? FIFO_TRIGGER_8 : FIFO_TRIGGER_4); 1155 else 1156 sc->sc_fifo = 0; 1157 1158 /* And copy to tty. */ 1159 tp->t_ispeed = 0; 1160 tp->t_ospeed = t->c_ospeed; 1161 tp->t_cflag = t->c_cflag; 1162 1163 if (!sc->sc_heldchange) { 1164 if (sc->sc_tx_busy) { 1165 sc->sc_heldtbc = sc->sc_tbc; 1166 sc->sc_tbc = 0; 1167 sc->sc_heldchange = 1; 1168 } else 1169 com_loadchannelregs(sc); 1170 } 1171 1172 if (!ISSET(t->c_cflag, CHWFLOW)) { 1173 /* Disable the high water mark. */ 1174 sc->sc_r_hiwat = 0; 1175 sc->sc_r_lowat = 0; 1176 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1177 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1178 com_schedrx(sc); 1179 } 1180 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED)) { 1181 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED|RX_IBUF_BLOCKED); 1182 com_hwiflow(sc); 1183 } 1184 } else { 1185 sc->sc_r_hiwat = com_rbuf_hiwat; 1186 sc->sc_r_lowat = com_rbuf_lowat; 1187 } 1188 1189 splx(s); 1190 1191 /* 1192 * Update the tty layer's idea of the carrier bit, in case we changed 1193 * CLOCAL or MDMBUF. We don't hang up here; we only do that by 1194 * explicit request. 1195 */ 1196 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(sc->sc_msr, MSR_DCD)); 1197 1198 #ifdef COM_DEBUG 1199 if (com_debug) 1200 comstatus(sc, "comparam "); 1201 #endif 1202 1203 if (!ISSET(t->c_cflag, CHWFLOW)) { 1204 if (sc->sc_tx_stopped) { 1205 sc->sc_tx_stopped = 0; 1206 comstart(tp); 1207 } 1208 } 1209 1210 return (0); 1211 } 1212 1213 void 1214 com_iflush(sc) 1215 struct com_softc *sc; 1216 { 1217 bus_space_tag_t iot = sc->sc_iot; 1218 bus_space_handle_t ioh = sc->sc_ioh; 1219 #ifdef DIAGNOSTIC 1220 int reg; 1221 #endif 1222 int timo; 1223 1224 #ifdef DIAGNOSTIC 1225 reg = 0xffff; 1226 #endif 1227 timo = 50000; 1228 /* flush any pending I/O */ 1229 while (ISSET(bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY) 1230 && --timo) 1231 #ifdef DIAGNOSTIC 1232 reg = 1233 #else 1234 (void) 1235 #endif 1236 bus_space_read_1(iot, ioh, com_data); 1237 #ifdef DIAGNOSTIC 1238 if (!timo) 1239 printf("%s: com_iflush timeout %02x\n", sc->sc_dev.dv_xname, 1240 reg); 1241 #endif 1242 } 1243 1244 void 1245 com_loadchannelregs(sc) 1246 struct com_softc *sc; 1247 { 1248 bus_space_tag_t iot = sc->sc_iot; 1249 bus_space_handle_t ioh = sc->sc_ioh; 1250 1251 /* XXXXX necessary? */ 1252 com_iflush(sc); 1253 1254 bus_space_write_1(iot, ioh, com_ier, 0); 1255 1256 if (ISSET(sc->sc_hwflags, COM_HW_FLOW)) { 1257 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1258 bus_space_write_1(iot, ioh, com_efr, sc->sc_efr); 1259 } 1260 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr | LCR_DLAB); 1261 bus_space_write_1(iot, ioh, com_dlbl, sc->sc_dlbl); 1262 bus_space_write_1(iot, ioh, com_dlbh, sc->sc_dlbh); 1263 bus_space_write_1(iot, ioh, com_lcr, sc->sc_lcr); 1264 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active = sc->sc_mcr); 1265 bus_space_write_1(iot, ioh, com_fifo, sc->sc_fifo); 1266 1267 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1268 } 1269 1270 int 1271 comhwiflow(tp, block) 1272 struct tty *tp; 1273 int block; 1274 { 1275 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1276 int s; 1277 1278 if (sc->sc_mcr_rts == 0) 1279 return (0); 1280 1281 s = splserial(); 1282 if (block) { 1283 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1284 SET(sc->sc_rx_flags, RX_TTY_BLOCKED); 1285 com_hwiflow(sc); 1286 } 1287 } else { 1288 if (ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) { 1289 CLR(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1290 com_schedrx(sc); 1291 } 1292 if (ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1293 CLR(sc->sc_rx_flags, RX_TTY_BLOCKED); 1294 com_hwiflow(sc); 1295 } 1296 } 1297 splx(s); 1298 return (1); 1299 } 1300 1301 /* 1302 * (un)block input via hw flowcontrol 1303 */ 1304 void 1305 com_hwiflow(sc) 1306 struct com_softc *sc; 1307 { 1308 bus_space_tag_t iot = sc->sc_iot; 1309 bus_space_handle_t ioh = sc->sc_ioh; 1310 1311 if (sc->sc_mcr_rts == 0) 1312 return; 1313 1314 if (ISSET(sc->sc_rx_flags, RX_ANY_BLOCK)) { 1315 CLR(sc->sc_mcr, sc->sc_mcr_rts); 1316 CLR(sc->sc_mcr_active, sc->sc_mcr_rts); 1317 } else { 1318 SET(sc->sc_mcr, sc->sc_mcr_rts); 1319 SET(sc->sc_mcr_active, sc->sc_mcr_rts); 1320 } 1321 bus_space_write_1(iot, ioh, com_mcr, sc->sc_mcr_active); 1322 } 1323 1324 1325 void 1326 comstart(tp) 1327 struct tty *tp; 1328 { 1329 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1330 bus_space_tag_t iot = sc->sc_iot; 1331 bus_space_handle_t ioh = sc->sc_ioh; 1332 int s; 1333 1334 s = spltty(); 1335 if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) 1336 goto out; 1337 if (sc->sc_tx_stopped) 1338 goto out; 1339 1340 if (tp->t_outq.c_cc <= tp->t_lowat) { 1341 if (ISSET(tp->t_state, TS_ASLEEP)) { 1342 CLR(tp->t_state, TS_ASLEEP); 1343 wakeup(&tp->t_outq); 1344 } 1345 selwakeup(&tp->t_wsel); 1346 if (tp->t_outq.c_cc == 0) 1347 goto out; 1348 } 1349 1350 /* Grab the first contiguous region of buffer space. */ 1351 { 1352 u_char *tba; 1353 int tbc; 1354 1355 tba = tp->t_outq.c_cf; 1356 tbc = ndqb(&tp->t_outq, 0); 1357 1358 (void)splserial(); 1359 1360 sc->sc_tba = tba; 1361 sc->sc_tbc = tbc; 1362 } 1363 1364 SET(tp->t_state, TS_BUSY); 1365 sc->sc_tx_busy = 1; 1366 1367 /* Enable transmit completion interrupts if necessary. */ 1368 if (!ISSET(sc->sc_ier, IER_ETXRDY)) { 1369 SET(sc->sc_ier, IER_ETXRDY); 1370 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1371 } 1372 1373 /* Output the first chunk of the contiguous buffer. */ 1374 { 1375 int n; 1376 1377 n = sc->sc_tbc; 1378 if (n > sc->sc_fifolen) 1379 n = sc->sc_fifolen; 1380 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1381 sc->sc_tbc -= n; 1382 sc->sc_tba += n; 1383 } 1384 out: 1385 splx(s); 1386 return; 1387 } 1388 1389 /* 1390 * Stop output on a line. 1391 */ 1392 void 1393 comstop(tp, flag) 1394 struct tty *tp; 1395 int flag; 1396 { 1397 struct com_softc *sc = com_cd.cd_devs[COMUNIT(tp->t_dev)]; 1398 int s; 1399 1400 s = splserial(); 1401 if (ISSET(tp->t_state, TS_BUSY)) { 1402 /* Stop transmitting at the next chunk. */ 1403 sc->sc_tbc = 0; 1404 sc->sc_heldtbc = 0; 1405 if (!ISSET(tp->t_state, TS_TTSTOP)) 1406 SET(tp->t_state, TS_FLUSH); 1407 } 1408 splx(s); 1409 } 1410 1411 void 1412 comdiag(arg) 1413 void *arg; 1414 { 1415 struct com_softc *sc = arg; 1416 int overflows, floods; 1417 int s; 1418 1419 s = splserial(); 1420 overflows = sc->sc_overflows; 1421 sc->sc_overflows = 0; 1422 floods = sc->sc_floods; 1423 sc->sc_floods = 0; 1424 sc->sc_errors = 0; 1425 splx(s); 1426 1427 log(LOG_WARNING, "%s: %d silo overflow%s, %d ibuf flood%s\n", 1428 sc->sc_dev.dv_xname, 1429 overflows, overflows == 1 ? "" : "s", 1430 floods, floods == 1 ? "" : "s"); 1431 } 1432 1433 integrate void 1434 com_rxsoft(sc, tp) 1435 struct com_softc *sc; 1436 struct tty *tp; 1437 { 1438 int (*rint) __P((int c, struct tty *tp)) = linesw[tp->t_line].l_rint; 1439 u_char *get, *end; 1440 u_int cc, scc; 1441 u_char lsr; 1442 int code; 1443 int s; 1444 1445 end = sc->sc_ebuf; 1446 get = sc->sc_rbget; 1447 scc = cc = com_rbuf_size - sc->sc_rbavail; 1448 1449 if (cc == com_rbuf_size) { 1450 sc->sc_floods++; 1451 if (sc->sc_errors++ == 0) 1452 timeout(comdiag, sc, 60 * hz); 1453 } 1454 1455 while (cc) { 1456 code = get[0]; 1457 lsr = get[1]; 1458 if (ISSET(lsr, LSR_OE | LSR_BI | LSR_FE | LSR_PE)) { 1459 if (ISSET(lsr, LSR_OE)) { 1460 sc->sc_overflows++; 1461 if (sc->sc_errors++ == 0) 1462 timeout(comdiag, sc, 60 * hz); 1463 } 1464 if (ISSET(lsr, LSR_BI | LSR_FE)) 1465 SET(code, TTY_FE); 1466 if (ISSET(lsr, LSR_PE)) 1467 SET(code, TTY_PE); 1468 } 1469 if ((*rint)(code, tp) == -1) { 1470 /* 1471 * The line discipline's buffer is out of space. 1472 */ 1473 if (!ISSET(sc->sc_rx_flags, RX_TTY_BLOCKED)) { 1474 /* 1475 * We're either not using flow control, or the 1476 * line discipline didn't tell us to block for 1477 * some reason. Either way, we have no way to 1478 * know when there's more space available, so 1479 * just drop the rest of the data. 1480 */ 1481 get += cc << 1; 1482 if (get >= end) 1483 get -= com_rbuf_size << 1; 1484 cc = 0; 1485 } else { 1486 /* 1487 * Don't schedule any more receive processing 1488 * until the line discipline tells us there's 1489 * space available (through comhwiflow()). 1490 * Leave the rest of the data in the input 1491 * buffer. 1492 */ 1493 SET(sc->sc_rx_flags, RX_TTY_OVERFLOWED); 1494 } 1495 break; 1496 } 1497 get += 2; 1498 if (get >= end) 1499 get = sc->sc_rbuf; 1500 cc--; 1501 } 1502 1503 if (cc != scc) { 1504 sc->sc_rbget = get; 1505 s = splserial(); 1506 cc = sc->sc_rbavail += scc - cc; 1507 /* Buffers should be ok again, release possible block. */ 1508 if (cc >= sc->sc_r_lowat) { 1509 if (ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1510 CLR(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1511 SET(sc->sc_ier, IER_ERXRDY); 1512 bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_ier, sc->sc_ier); 1513 } 1514 if (ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED)) { 1515 CLR(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1516 com_hwiflow(sc); 1517 } 1518 } 1519 splx(s); 1520 } 1521 } 1522 1523 integrate void 1524 com_txsoft(sc, tp) 1525 struct com_softc *sc; 1526 struct tty *tp; 1527 { 1528 1529 CLR(tp->t_state, TS_BUSY); 1530 if (ISSET(tp->t_state, TS_FLUSH)) 1531 CLR(tp->t_state, TS_FLUSH); 1532 else 1533 ndflush(&tp->t_outq, (int)(sc->sc_tba - tp->t_outq.c_cf)); 1534 (*linesw[tp->t_line].l_start)(tp); 1535 } 1536 1537 integrate void 1538 com_stsoft(sc, tp) 1539 struct com_softc *sc; 1540 struct tty *tp; 1541 { 1542 u_char msr, delta; 1543 int s; 1544 1545 s = splserial(); 1546 msr = sc->sc_msr; 1547 delta = sc->sc_msr_delta; 1548 sc->sc_msr_delta = 0; 1549 splx(s); 1550 1551 if (ISSET(delta, sc->sc_msr_dcd)) { 1552 /* 1553 * Inform the tty layer that carrier detect changed. 1554 */ 1555 (void) (*linesw[tp->t_line].l_modem)(tp, ISSET(msr, MSR_DCD)); 1556 } 1557 1558 if (ISSET(delta, sc->sc_msr_cts)) { 1559 /* Block or unblock output according to flow control. */ 1560 if (ISSET(msr, sc->sc_msr_cts)) { 1561 sc->sc_tx_stopped = 0; 1562 (*linesw[tp->t_line].l_start)(tp); 1563 } else { 1564 sc->sc_tx_stopped = 1; 1565 } 1566 } 1567 1568 #ifdef COM_DEBUG 1569 if (com_debug) 1570 comstatus(sc, "com_stsoft"); 1571 #endif 1572 } 1573 1574 #ifdef __GENERIC_SOFT_INTERRUPTS 1575 void 1576 comsoft(arg) 1577 void *arg; 1578 { 1579 struct com_softc *sc = arg; 1580 struct tty *tp; 1581 1582 if (!sc->enabled) 1583 return; 1584 1585 { 1586 #else 1587 void 1588 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1589 comsoft() 1590 #else 1591 comsoft(arg) 1592 void *arg; 1593 #endif 1594 { 1595 struct com_softc *sc; 1596 struct tty *tp; 1597 int unit; 1598 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1599 int s; 1600 1601 s = splsoftserial(); 1602 com_softintr_scheduled = 0; 1603 #endif 1604 1605 for (unit = 0; unit < com_cd.cd_ndevs; unit++) { 1606 sc = com_cd.cd_devs[unit]; 1607 if (sc == NULL || !ISSET(sc->sc_hwflags, COM_HW_DEV_OK)) 1608 continue; 1609 1610 if (!sc->enabled) 1611 continue; 1612 1613 tp = sc->sc_tty; 1614 if (tp == NULL) 1615 continue; 1616 if (!ISSET(tp->t_state, TS_ISOPEN) && tp->t_wopen == 0) 1617 continue; 1618 #endif 1619 tp = sc->sc_tty; 1620 1621 if (sc->sc_rx_ready) { 1622 sc->sc_rx_ready = 0; 1623 com_rxsoft(sc, tp); 1624 } 1625 1626 if (sc->sc_st_check) { 1627 sc->sc_st_check = 0; 1628 com_stsoft(sc, tp); 1629 } 1630 1631 if (sc->sc_tx_done) { 1632 sc->sc_tx_done = 0; 1633 com_txsoft(sc, tp); 1634 } 1635 } 1636 1637 #ifndef __GENERIC_SOFT_INTERRUPTS 1638 #ifdef __NO_SOFT_SERIAL_INTERRUPT 1639 splx(s); 1640 #endif 1641 #endif 1642 } 1643 1644 #ifdef __ALIGN_BRACKET_LEVEL_FOR_CTAGS 1645 /* there has got to be a better way to do comsoft() */ 1646 }} 1647 #endif 1648 1649 int 1650 comintr(arg) 1651 void *arg; 1652 { 1653 struct com_softc *sc = arg; 1654 bus_space_tag_t iot = sc->sc_iot; 1655 bus_space_handle_t ioh = sc->sc_ioh; 1656 u_char *put, *end; 1657 u_int cc; 1658 u_char lsr, iir; 1659 1660 if (!sc->enabled) 1661 return (0); 1662 1663 iir = bus_space_read_1(iot, ioh, com_iir); 1664 if (ISSET(iir, IIR_NOPEND)) 1665 return (0); 1666 1667 end = sc->sc_ebuf; 1668 put = sc->sc_rbput; 1669 cc = sc->sc_rbavail; 1670 1671 do { 1672 u_char msr, delta; 1673 1674 lsr = bus_space_read_1(iot, ioh, com_lsr); 1675 #if defined(DDB) || defined(KGDB) 1676 if (ISSET(lsr, LSR_BI)) { 1677 #ifdef DDB 1678 if (ISSET(sc->sc_hwflags, COM_HW_CONSOLE)) { 1679 Debugger(); 1680 continue; 1681 } 1682 #endif 1683 #ifdef KGDB 1684 if (ISSET(sc->sc_hwflags, COM_HW_KGDB)) { 1685 kgdb_connect(1); 1686 continue; 1687 } 1688 #endif 1689 } 1690 #endif /* DDB || KGDB */ 1691 1692 if (ISSET(lsr, LSR_RCV_MASK) && 1693 !ISSET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED)) { 1694 while (cc > 0) { 1695 put[0] = bus_space_read_1(iot, ioh, com_data); 1696 put[1] = lsr; 1697 put += 2; 1698 if (put >= end) 1699 put = sc->sc_rbuf; 1700 cc--; 1701 1702 lsr = bus_space_read_1(iot, ioh, com_lsr); 1703 if (!ISSET(lsr, LSR_RCV_MASK)) 1704 break; 1705 } 1706 1707 /* 1708 * Current string of incoming characters ended because 1709 * no more data was available or we ran out of space. 1710 * Schedule a receive event if any data was received. 1711 * If we're out of space, turn off receive interrupts. 1712 */ 1713 sc->sc_rbput = put; 1714 sc->sc_rbavail = cc; 1715 if (!ISSET(sc->sc_rx_flags, RX_TTY_OVERFLOWED)) 1716 sc->sc_rx_ready = 1; 1717 1718 /* 1719 * See if we are in danger of overflowing a buffer. If 1720 * so, use hardware flow control to ease the pressure. 1721 */ 1722 if (!ISSET(sc->sc_rx_flags, RX_IBUF_BLOCKED) && 1723 cc < sc->sc_r_hiwat) { 1724 SET(sc->sc_rx_flags, RX_IBUF_BLOCKED); 1725 com_hwiflow(sc); 1726 } 1727 1728 /* 1729 * If we're out of space, disable receive interrupts 1730 * until the queue has drained a bit. 1731 */ 1732 if (!cc) { 1733 SET(sc->sc_rx_flags, RX_IBUF_OVERFLOWED); 1734 CLR(sc->sc_ier, IER_ERXRDY); 1735 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1736 } 1737 } else { 1738 if ((iir & IIR_IMASK) == IIR_RXRDY) { 1739 bus_space_write_1(iot, ioh, com_ier, 0); 1740 delay(10); 1741 bus_space_write_1(iot, ioh, com_ier,sc->sc_ier); 1742 iir = IIR_NOPEND; 1743 continue; 1744 } 1745 } 1746 1747 msr = bus_space_read_1(iot, ioh, com_msr); 1748 delta = msr ^ sc->sc_msr; 1749 sc->sc_msr = msr; 1750 if (ISSET(delta, sc->sc_msr_mask)) { 1751 SET(sc->sc_msr_delta, delta); 1752 1753 /* 1754 * Stop output immediately if we lose the output 1755 * flow control signal or carrier detect. 1756 */ 1757 if (ISSET(~msr, sc->sc_msr_mask)) { 1758 sc->sc_tbc = 0; 1759 sc->sc_heldtbc = 0; 1760 #ifdef COM_DEBUG 1761 if (com_debug) 1762 comstatus(sc, "comintr "); 1763 #endif 1764 } 1765 1766 sc->sc_st_check = 1; 1767 } 1768 } while (!ISSET((iir = bus_space_read_1(iot, ioh, com_iir)), IIR_NOPEND)); 1769 1770 /* 1771 * Done handling any receive interrupts. See if data can be 1772 * transmitted as well. Schedule tx done event if no data left 1773 * and tty was marked busy. 1774 */ 1775 if (ISSET(lsr, LSR_TXRDY)) { 1776 /* 1777 * If we've delayed a parameter change, do it now, and restart 1778 * output. 1779 */ 1780 if (sc->sc_heldchange) { 1781 com_loadchannelregs(sc); 1782 sc->sc_heldchange = 0; 1783 sc->sc_tbc = sc->sc_heldtbc; 1784 sc->sc_heldtbc = 0; 1785 } 1786 1787 /* Output the next chunk of the contiguous buffer, if any. */ 1788 if (sc->sc_tbc > 0) { 1789 int n; 1790 1791 n = sc->sc_tbc; 1792 if (n > sc->sc_fifolen) 1793 n = sc->sc_fifolen; 1794 bus_space_write_multi_1(iot, ioh, com_data, sc->sc_tba, n); 1795 sc->sc_tbc -= n; 1796 sc->sc_tba += n; 1797 } else { 1798 /* Disable transmit completion interrupts if necessary. */ 1799 if (ISSET(sc->sc_ier, IER_ETXRDY)) { 1800 CLR(sc->sc_ier, IER_ETXRDY); 1801 bus_space_write_1(iot, ioh, com_ier, sc->sc_ier); 1802 } 1803 if (sc->sc_tx_busy) { 1804 sc->sc_tx_busy = 0; 1805 sc->sc_tx_done = 1; 1806 } 1807 } 1808 } 1809 1810 /* Wake up the poller. */ 1811 #ifdef __GENERIC_SOFT_INTERRUPTS 1812 softintr_schedule(sc->sc_si); 1813 #else 1814 #ifndef __NO_SOFT_SERIAL_INTERRUPT 1815 setsoftserial(); 1816 #else 1817 if (!com_softintr_scheduled) { 1818 com_softintr_scheduled = 1; 1819 timeout(comsoft, NULL, 1); 1820 } 1821 #endif 1822 #endif 1823 1824 #if NRND > 0 && defined(RND_COM) 1825 rnd_add_uint32(&sc->rnd_source, iir | lsr); 1826 #endif 1827 1828 return (1); 1829 } 1830 1831 /* 1832 * The following functions are polled getc and putc routines, shared 1833 * by the console and kgdb glue. 1834 */ 1835 1836 int 1837 com_common_getc(iot, ioh) 1838 bus_space_tag_t iot; 1839 bus_space_handle_t ioh; 1840 { 1841 int s = splserial(); 1842 u_char stat, c; 1843 1844 /* block until a character becomes available */ 1845 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_RXRDY)) 1846 ; 1847 1848 c = bus_space_read_1(iot, ioh, com_data); 1849 stat = bus_space_read_1(iot, ioh, com_iir); 1850 splx(s); 1851 return (c); 1852 } 1853 1854 void 1855 com_common_putc(iot, ioh, c) 1856 bus_space_tag_t iot; 1857 bus_space_handle_t ioh; 1858 int c; 1859 { 1860 int s = splserial(); 1861 u_char stat; 1862 int timo; 1863 1864 /* wait for any pending transmission to finish */ 1865 timo = 50000; 1866 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1867 && --timo) 1868 ; 1869 1870 bus_space_write_1(iot, ioh, com_data, c); 1871 /* wait for this transmission to complete */ 1872 timo = 1500000; 1873 while (!ISSET(stat = bus_space_read_1(iot, ioh, com_lsr), LSR_TXRDY) 1874 && --timo) 1875 ; 1876 1877 /* clear any interrupts generated by this transmission */ 1878 stat = bus_space_read_1(iot, ioh, com_iir); 1879 splx(s); 1880 } 1881 1882 /* 1883 * Initialize UART to known state. 1884 */ 1885 int 1886 cominit(iot, iobase, rate, frequency, cflag, iohp) 1887 bus_space_tag_t iot; 1888 int iobase; 1889 int rate, frequency; 1890 tcflag_t cflag; 1891 bus_space_handle_t *iohp; 1892 { 1893 bus_space_handle_t ioh; 1894 1895 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) 1896 return (ENOMEM); /* ??? */ 1897 1898 bus_space_write_1(iot, ioh, com_lcr, LCR_EERS); 1899 bus_space_write_1(iot, ioh, com_efr, 0); 1900 bus_space_write_1(iot, ioh, com_lcr, LCR_DLAB); 1901 rate = comspeed(rate, frequency); 1902 bus_space_write_1(iot, ioh, com_dlbl, rate); 1903 bus_space_write_1(iot, ioh, com_dlbh, rate >> 8); 1904 bus_space_write_1(iot, ioh, com_lcr, cflag2lcr(cflag)); 1905 bus_space_write_1(iot, ioh, com_mcr, 0); 1906 bus_space_write_1(iot, ioh, com_fifo, 1907 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1); 1908 bus_space_write_1(iot, ioh, com_ier, 0); 1909 1910 *iohp = ioh; 1911 return (0); 1912 } 1913 1914 /* 1915 * Following are all routines needed for COM to act as console 1916 */ 1917 1918 int 1919 comcnattach(iot, iobase, rate, frequency, cflag) 1920 bus_space_tag_t iot; 1921 int iobase; 1922 int rate, frequency; 1923 tcflag_t cflag; 1924 { 1925 int res; 1926 static struct consdev comcons = { 1927 NULL, NULL, comcngetc, comcnputc, comcnpollc, NODEV, CN_NORMAL 1928 }; 1929 1930 res = cominit(iot, iobase, rate, frequency, cflag, &comconsioh); 1931 if (res) 1932 return (res); 1933 1934 cn_tab = &comcons; 1935 1936 comconstag = iot; 1937 comconsaddr = iobase; 1938 comconsrate = rate; 1939 comconscflag = cflag; 1940 1941 return (0); 1942 } 1943 1944 int 1945 comcngetc(dev) 1946 dev_t dev; 1947 { 1948 1949 return (com_common_getc(comconstag, comconsioh)); 1950 } 1951 1952 /* 1953 * Console kernel output character routine. 1954 */ 1955 void 1956 comcnputc(dev, c) 1957 dev_t dev; 1958 int c; 1959 { 1960 1961 com_common_putc(comconstag, comconsioh, c); 1962 } 1963 1964 void 1965 comcnpollc(dev, on) 1966 dev_t dev; 1967 int on; 1968 { 1969 1970 } 1971 1972 #ifdef KGDB 1973 int 1974 com_kgdb_attach(iot, iobase, rate, frequency, cflag) 1975 bus_space_tag_t iot; 1976 int iobase; 1977 int rate, frequency; 1978 tcflag_t cflag; 1979 { 1980 int res; 1981 1982 if (iot == comconstag && iobase == comconsaddr) 1983 return (EBUSY); /* cannot share with console */ 1984 1985 res = cominit(iot, iobase, rate, frequency, cflag, &com_kgdb_ioh); 1986 if (res) 1987 return (res); 1988 1989 kgdb_attach(com_kgdb_getc, com_kgdb_putc, NULL); 1990 kgdb_dev = 123; /* unneeded, only to satisfy some tests */ 1991 1992 com_kgdb_iot = iot; 1993 com_kgdb_addr = iobase; 1994 1995 return (0); 1996 } 1997 1998 /* ARGSUSED */ 1999 int 2000 com_kgdb_getc(arg) 2001 void *arg; 2002 { 2003 2004 return (com_common_getc(com_kgdb_iot, com_kgdb_ioh)); 2005 } 2006 2007 /* ARGSUSED */ 2008 void 2009 com_kgdb_putc(arg, c) 2010 void *arg; 2011 int c; 2012 { 2013 2014 return (com_common_putc(com_kgdb_iot, com_kgdb_ioh, c)); 2015 } 2016 #endif /* KGDB */ 2017 2018 /* helper function to identify the com ports used by 2019 console or KGDB (and not yet autoconf attached) */ 2020 int 2021 com_is_console(iot, iobase, ioh) 2022 bus_space_tag_t iot; 2023 int iobase; 2024 bus_space_handle_t *ioh; 2025 { 2026 bus_space_handle_t help; 2027 2028 if (!comconsattached && 2029 iot == comconstag && iobase == comconsaddr) 2030 help = comconsioh; 2031 #ifdef KGDB 2032 else if (!com_kgdb_attached && 2033 iot == com_kgdb_iot && iobase == com_kgdb_addr) 2034 help = com_kgdb_ioh; 2035 #endif 2036 else 2037 return (0); 2038 2039 if (ioh) 2040 *ioh = help; 2041 return (1); 2042 } 2043
Indexes created Wed Sep 24 15:09:51 GMT 2025