| 1 | /* $NetBSD: xencons.c,v 1.41 2014/07/25 08:10:35 dholland Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2006 Manuel Bouyer. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 | * |
| 26 | */ |
| 27 | |
| 28 | /* |
| 29 | * |
| 30 | * Copyright (c) 2004 Christian Limpach. |
| 31 | * All rights reserved. |
| 32 | * |
| 33 | * Redistribution and use in source and binary forms, with or without |
| 34 | * modification, are permitted provided that the following conditions |
| 35 | * are met: |
| 36 | * 1. Redistributions of source code must retain the above copyright |
| 37 | * notice, this list of conditions and the following disclaimer. |
| 38 | * 2. Redistributions in binary form must reproduce the above copyright |
| 39 | * notice, this list of conditions and the following disclaimer in the |
| 40 | * documentation and/or other materials provided with the distribution. |
| 41 | * |
| 42 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 43 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 44 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 45 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 46 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 47 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 48 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 49 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 50 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 51 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 52 | */ |
| 53 | |
| 54 | |
| 55 | #include <sys/cdefs.h> |
| 56 | __KERNEL_RCSID(0, "$NetBSD: xencons.c,v 1.41 2014/07/25 08:10:35 dholland Exp $" ); |
| 57 | |
| 58 | #include "opt_xen.h" |
| 59 | |
| 60 | #include <sys/param.h> |
| 61 | #include <sys/ioctl.h> |
| 62 | #include <sys/proc.h> |
| 63 | #include <sys/tty.h> |
| 64 | #include <sys/systm.h> |
| 65 | #include <sys/device.h> |
| 66 | #include <sys/conf.h> |
| 67 | #include <sys/kauth.h> |
| 68 | #include <sys/kernel.h> |
| 69 | |
| 70 | #include <xen/xen.h> |
| 71 | #include <xen/hypervisor.h> |
| 72 | #include <xen/evtchn.h> |
| 73 | #include <uvm/uvm.h> |
| 74 | #include <machine/pmap.h> |
| 75 | #include <xen/xen-public/io/console.h> |
| 76 | |
| 77 | #include <dev/cons.h> |
| 78 | |
| 79 | #ifdef DDB |
| 80 | #include <ddb/db_output.h> /* XXX for db_max_line */ |
| 81 | #endif |
| 82 | |
| 83 | #undef XENDEBUG |
| 84 | |
| 85 | #ifdef XENDEBUG |
| 86 | #define XENPRINTK(x) printk x |
| 87 | #else |
| 88 | #define XENPRINTK(x) |
| 89 | #endif |
| 90 | |
| 91 | static int xencons_isconsole = 0; |
| 92 | static struct xencons_softc *xencons_console_device = NULL; |
| 93 | |
| 94 | #define XENCONS_UNIT(x) (minor(x)) |
| 95 | #define XENCONS_BURST 128 |
| 96 | |
| 97 | int xencons_match(device_t, cfdata_t, void *); |
| 98 | void xencons_attach(device_t, device_t, void *); |
| 99 | int xencons_intr(void *); |
| 100 | void xencons_tty_input(struct xencons_softc *, char*, int); |
| 101 | |
| 102 | |
| 103 | struct xencons_softc { |
| 104 | device_t sc_dev; |
| 105 | struct tty *sc_tty; |
| 106 | int polling; |
| 107 | }; |
| 108 | volatile struct xencons_interface *xencons_interface; |
| 109 | |
| 110 | CFATTACH_DECL_NEW(xencons, sizeof(struct xencons_softc), |
| 111 | xencons_match, xencons_attach, NULL, NULL); |
| 112 | |
| 113 | extern struct cfdriver xencons_cd; |
| 114 | |
| 115 | dev_type_open(xencons_open); |
| 116 | dev_type_close(xencons_close); |
| 117 | dev_type_read(xencons_read); |
| 118 | dev_type_write(xencons_write); |
| 119 | dev_type_ioctl(xencons_ioctl); |
| 120 | dev_type_stop(xencons_stop); |
| 121 | dev_type_tty(xencons_tty); |
| 122 | dev_type_poll(xencons_poll); |
| 123 | |
| 124 | const struct cdevsw xencons_cdevsw = { |
| 125 | .d_open = xencons_open, |
| 126 | .d_close = xencons_close, |
| 127 | .d_read = xencons_read, |
| 128 | .d_write = xencons_write, |
| 129 | .d_ioctl = xencons_ioctl, |
| 130 | .d_stop = xencons_stop, |
| 131 | .d_tty = xencons_tty, |
| 132 | .d_poll = xencons_poll, |
| 133 | .d_mmap = NULL, /* XXX: is this safe? - dholland 20140315 */ |
| 134 | .d_kqfilter = ttykqfilter, |
| 135 | .d_discard = nodiscard, |
| 136 | .d_flag = D_TTY |
| 137 | }; |
| 138 | |
| 139 | |
| 140 | static int xencons_handler(void *); |
| 141 | int xenconscn_getc(dev_t); |
| 142 | void xenconscn_putc(dev_t, int); |
| 143 | void xenconscn_pollc(dev_t, int); |
| 144 | |
| 145 | static bool xencons_suspend(device_t, const pmf_qual_t *); |
| 146 | static bool xencons_resume(device_t, const pmf_qual_t *); |
| 147 | |
| 148 | static struct consdev xencons = { |
| 149 | NULL, NULL, xenconscn_getc, xenconscn_putc, xenconscn_pollc, |
| 150 | NULL, NULL, NULL, NODEV, CN_NORMAL |
| 151 | }; |
| 152 | |
| 153 | static struct cnm_state xencons_cnm_state; |
| 154 | |
| 155 | void xencons_start (struct tty *); |
| 156 | int xencons_param (struct tty *, struct termios *); |
| 157 | |
| 158 | int |
| 159 | xencons_match(device_t parent, cfdata_t match, void *aux) |
| 160 | { |
| 161 | struct xencons_attach_args *xa = (struct xencons_attach_args *)aux; |
| 162 | |
| 163 | if (strcmp(xa->xa_device, "xencons" ) == 0) |
| 164 | return 1; |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | void |
| 169 | xencons_attach(device_t parent, device_t self, void *aux) |
| 170 | { |
| 171 | struct xencons_softc *sc = device_private(self); |
| 172 | |
| 173 | aprint_normal(": Xen Virtual Console Driver\n" ); |
| 174 | |
| 175 | sc->sc_dev = self; |
| 176 | sc->sc_tty = tty_alloc(); |
| 177 | tty_attach(sc->sc_tty); |
| 178 | sc->sc_tty->t_oproc = xencons_start; |
| 179 | sc->sc_tty->t_param = xencons_param; |
| 180 | |
| 181 | if (xencons_isconsole) { |
| 182 | int maj; |
| 183 | |
| 184 | /* Locate the major number. */ |
| 185 | maj = cdevsw_lookup_major(&xencons_cdevsw); |
| 186 | |
| 187 | /* There can be only one, but it can have any unit number. */ |
| 188 | cn_tab->cn_dev = makedev(maj, device_unit(self)); |
| 189 | |
| 190 | aprint_verbose_dev(self, "console major %d, unit %d\n" , |
| 191 | maj, device_unit(self)); |
| 192 | |
| 193 | sc->sc_tty->t_dev = cn_tab->cn_dev; |
| 194 | |
| 195 | #ifdef DDB |
| 196 | /* Set db_max_line to avoid paging. */ |
| 197 | db_max_line = 0x7fffffff; |
| 198 | #endif |
| 199 | |
| 200 | xencons_console_device = sc; |
| 201 | |
| 202 | xencons_resume(self, PMF_Q_NONE); |
| 203 | } |
| 204 | sc->polling = 0; |
| 205 | |
| 206 | if (!pmf_device_register(self, xencons_suspend, xencons_resume)) |
| 207 | aprint_error_dev(self, "couldn't establish power handler\n" ); |
| 208 | } |
| 209 | |
| 210 | static bool |
| 211 | xencons_suspend(device_t dev, const pmf_qual_t *qual) { |
| 212 | |
| 213 | int evtch; |
| 214 | |
| 215 | /* dom0 console should not be suspended */ |
| 216 | if (!xendomain_is_dom0()) { |
| 217 | evtch = xen_start_info.console_evtchn; |
| 218 | hypervisor_mask_event(evtch); |
| 219 | if (event_remove_handler(evtch, xencons_handler, |
| 220 | xencons_console_device) != 0) { |
| 221 | aprint_error_dev(dev, |
| 222 | "can't remove handler: xencons_handler\n" ); |
| 223 | } |
| 224 | |
| 225 | aprint_verbose_dev(dev, "removed event channel %d\n" , evtch); |
| 226 | } |
| 227 | |
| 228 | return true; |
| 229 | } |
| 230 | |
| 231 | static bool |
| 232 | xencons_resume(device_t dev, const pmf_qual_t *qual) { |
| 233 | |
| 234 | int evtch = -1; |
| 235 | |
| 236 | if (xendomain_is_dom0()) { |
| 237 | /* dom0 console resume is required only during first start-up */ |
| 238 | if (cold) { |
| 239 | evtch = bind_virq_to_evtch(VIRQ_CONSOLE); |
| 240 | event_set_handler(evtch, xencons_intr, |
| 241 | xencons_console_device, IPL_TTY, "xencons" ); |
| 242 | } |
| 243 | } else { |
| 244 | evtch = xen_start_info.console_evtchn; |
| 245 | event_set_handler(evtch, xencons_handler, |
| 246 | xencons_console_device, IPL_TTY, "xencons" ); |
| 247 | } |
| 248 | |
| 249 | if (evtch != -1) { |
| 250 | aprint_verbose_dev(dev, "using event channel %d\n" , evtch); |
| 251 | hypervisor_enable_event(evtch); |
| 252 | } |
| 253 | |
| 254 | return true; |
| 255 | } |
| 256 | |
| 257 | int |
| 258 | xencons_open(dev_t dev, int flag, int mode, struct lwp *l) |
| 259 | { |
| 260 | struct xencons_softc *sc; |
| 261 | struct tty *tp; |
| 262 | |
| 263 | sc = device_lookup_private(&xencons_cd, XENCONS_UNIT(dev)); |
| 264 | if (sc == NULL) |
| 265 | return (ENXIO); |
| 266 | |
| 267 | tp = sc->sc_tty; |
| 268 | |
| 269 | if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp)) |
| 270 | return (EBUSY); |
| 271 | |
| 272 | if ((tp->t_state & TS_ISOPEN) == 0 && tp->t_wopen == 0) { |
| 273 | tp->t_dev = dev; |
| 274 | ttychars(tp); |
| 275 | tp->t_iflag = TTYDEF_IFLAG; |
| 276 | tp->t_oflag = TTYDEF_OFLAG; |
| 277 | tp->t_cflag = TTYDEF_CFLAG; |
| 278 | tp->t_lflag = TTYDEF_LFLAG; |
| 279 | tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; |
| 280 | xencons_param(tp, &tp->t_termios); |
| 281 | ttsetwater(tp); |
| 282 | } |
| 283 | tp->t_state |= TS_CARR_ON; |
| 284 | |
| 285 | return ((*tp->t_linesw->l_open)(dev, tp)); |
| 286 | } |
| 287 | |
| 288 | int |
| 289 | xencons_close(dev_t dev, int flag, int mode, struct lwp *l) |
| 290 | { |
| 291 | struct xencons_softc *sc = device_lookup_private(&xencons_cd, |
| 292 | XENCONS_UNIT(dev)); |
| 293 | struct tty *tp = sc->sc_tty; |
| 294 | |
| 295 | if (tp == NULL) |
| 296 | return (0); |
| 297 | (*tp->t_linesw->l_close)(tp, flag); |
| 298 | ttyclose(tp); |
| 299 | #ifdef notyet /* XXX */ |
| 300 | tty_free(tp); |
| 301 | #endif |
| 302 | return (0); |
| 303 | } |
| 304 | |
| 305 | int |
| 306 | xencons_read(dev_t dev, struct uio *uio, int flag) |
| 307 | { |
| 308 | struct xencons_softc *sc = device_lookup_private(&xencons_cd, |
| 309 | XENCONS_UNIT(dev)); |
| 310 | struct tty *tp = sc->sc_tty; |
| 311 | |
| 312 | return ((*tp->t_linesw->l_read)(tp, uio, flag)); |
| 313 | } |
| 314 | |
| 315 | int |
| 316 | xencons_write(dev_t dev, struct uio *uio, int flag) |
| 317 | { |
| 318 | struct xencons_softc *sc = device_lookup_private(&xencons_cd, |
| 319 | XENCONS_UNIT(dev)); |
| 320 | struct tty *tp = sc->sc_tty; |
| 321 | |
| 322 | return ((*tp->t_linesw->l_write)(tp, uio, flag)); |
| 323 | } |
| 324 | |
| 325 | int |
| 326 | xencons_poll(dev_t dev, int events, struct lwp *l) |
| 327 | { |
| 328 | struct xencons_softc *sc = device_lookup_private(&xencons_cd, |
| 329 | XENCONS_UNIT(dev)); |
| 330 | struct tty *tp = sc->sc_tty; |
| 331 | |
| 332 | return ((*tp->t_linesw->l_poll)(tp, events, l)); |
| 333 | } |
| 334 | |
| 335 | struct tty * |
| 336 | xencons_tty(dev_t dev) |
| 337 | { |
| 338 | struct xencons_softc *sc = device_lookup_private(&xencons_cd, |
| 339 | XENCONS_UNIT(dev)); |
| 340 | struct tty *tp = sc->sc_tty; |
| 341 | |
| 342 | return (tp); |
| 343 | } |
| 344 | |
| 345 | int |
| 346 | xencons_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) |
| 347 | { |
| 348 | struct xencons_softc *sc = device_lookup_private(&xencons_cd, |
| 349 | XENCONS_UNIT(dev)); |
| 350 | struct tty *tp = sc->sc_tty; |
| 351 | int error; |
| 352 | |
| 353 | error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); |
| 354 | if (error != EPASSTHROUGH) |
| 355 | return (error); |
| 356 | |
| 357 | error = ttioctl(tp, cmd, data, flag, l); |
| 358 | if (error != EPASSTHROUGH) |
| 359 | return (error); |
| 360 | |
| 361 | switch (cmd) { |
| 362 | default: |
| 363 | return (EPASSTHROUGH); |
| 364 | } |
| 365 | |
| 366 | #ifdef DIAGNOSTIC |
| 367 | panic("xencons_ioctl: impossible" ); |
| 368 | #endif |
| 369 | } |
| 370 | |
| 371 | void |
| 372 | xencons_start(struct tty *tp) |
| 373 | { |
| 374 | struct clist *cl; |
| 375 | int s; |
| 376 | |
| 377 | s = spltty(); |
| 378 | if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) |
| 379 | goto out; |
| 380 | tp->t_state |= TS_BUSY; |
| 381 | splx(s); |
| 382 | |
| 383 | /* |
| 384 | * We need to do this outside spl since it could be fairly |
| 385 | * expensive and we don't want our serial ports to overflow. |
| 386 | */ |
| 387 | cl = &tp->t_outq; |
| 388 | if (xendomain_is_dom0()) { |
| 389 | int len, r; |
| 390 | u_char buf[XENCONS_BURST+1]; |
| 391 | |
| 392 | len = q_to_b(cl, buf, XENCONS_BURST); |
| 393 | while (len > 0) { |
| 394 | r = HYPERVISOR_console_io(CONSOLEIO_write, len, buf); |
| 395 | if (r <= 0) |
| 396 | break; |
| 397 | len -= r; |
| 398 | } |
| 399 | } else { |
| 400 | XENCONS_RING_IDX cons, prod, len; |
| 401 | |
| 402 | #define XNC_OUT (xencons_interface->out) |
| 403 | cons = xencons_interface->out_cons; |
| 404 | prod = xencons_interface->out_prod; |
| 405 | xen_rmb(); |
| 406 | while (prod != cons + sizeof(xencons_interface->out)) { |
| 407 | if (MASK_XENCONS_IDX(prod, XNC_OUT) < |
| 408 | MASK_XENCONS_IDX(cons, XNC_OUT)) { |
| 409 | len = MASK_XENCONS_IDX(cons, XNC_OUT) - |
| 410 | MASK_XENCONS_IDX(prod, XNC_OUT); |
| 411 | } else { |
| 412 | len = sizeof(XNC_OUT) - |
| 413 | MASK_XENCONS_IDX(prod, XNC_OUT); |
| 414 | } |
| 415 | len = q_to_b(cl, __UNVOLATILE( |
| 416 | &XNC_OUT[MASK_XENCONS_IDX(prod, XNC_OUT)]), len); |
| 417 | if (len == 0) |
| 418 | break; |
| 419 | prod = prod + len; |
| 420 | } |
| 421 | xen_wmb(); |
| 422 | xencons_interface->out_prod = prod; |
| 423 | xen_wmb(); |
| 424 | hypervisor_notify_via_evtchn(xen_start_info.console.domU.evtchn); |
| 425 | #undef XNC_OUT |
| 426 | } |
| 427 | |
| 428 | s = spltty(); |
| 429 | tp->t_state &= ~TS_BUSY; |
| 430 | if (ttypull(tp)) { |
| 431 | tp->t_state |= TS_TIMEOUT; |
| 432 | callout_schedule(&tp->t_rstrt_ch, 1); |
| 433 | } |
| 434 | out: |
| 435 | splx(s); |
| 436 | } |
| 437 | |
| 438 | void |
| 439 | xencons_stop(struct tty *tp, int flag) |
| 440 | { |
| 441 | |
| 442 | } |
| 443 | |
| 444 | |
| 445 | /* Non-privileged console interrupt routine */ |
| 446 | static int |
| 447 | xencons_handler(void *arg) |
| 448 | { |
| 449 | struct xencons_softc *sc = arg; |
| 450 | XENCONS_RING_IDX cons, prod, len; |
| 451 | int s = spltty(); |
| 452 | |
| 453 | if (sc->polling) { |
| 454 | splx(s); |
| 455 | return 1; |
| 456 | } |
| 457 | |
| 458 | |
| 459 | #define XNC_IN (xencons_interface->in) |
| 460 | |
| 461 | cons = xencons_interface->in_cons; |
| 462 | prod = xencons_interface->in_prod; |
| 463 | xen_rmb(); |
| 464 | while (cons != prod) { |
| 465 | if (MASK_XENCONS_IDX(cons, XNC_IN) < |
| 466 | MASK_XENCONS_IDX(prod, XNC_IN)) |
| 467 | len = MASK_XENCONS_IDX(prod, XNC_IN) - |
| 468 | MASK_XENCONS_IDX(cons, XNC_IN); |
| 469 | else |
| 470 | len = sizeof(XNC_IN) - MASK_XENCONS_IDX(cons, XNC_IN); |
| 471 | |
| 472 | xencons_tty_input(sc, __UNVOLATILE( |
| 473 | &XNC_IN[MASK_XENCONS_IDX(cons, XNC_IN)]), len); |
| 474 | if (__predict_false(xencons_interface->in_cons != cons)) { |
| 475 | /* catch up with xenconscn_getc() */ |
| 476 | cons = xencons_interface->in_cons; |
| 477 | prod = xencons_interface->in_prod; |
| 478 | xen_rmb(); |
| 479 | } else { |
| 480 | cons += len; |
| 481 | xen_wmb(); |
| 482 | xencons_interface->in_cons = cons; |
| 483 | xen_wmb(); |
| 484 | } |
| 485 | } |
| 486 | hypervisor_notify_via_evtchn(xen_start_info.console.domU.evtchn); |
| 487 | splx(s); |
| 488 | return 1; |
| 489 | #undef XNC_IN |
| 490 | } |
| 491 | |
| 492 | |
| 493 | void |
| 494 | xencons_tty_input(struct xencons_softc *sc, char* buf, int len) |
| 495 | { |
| 496 | struct tty *tp; |
| 497 | int i; |
| 498 | |
| 499 | tp = sc->sc_tty; |
| 500 | if (tp == NULL) |
| 501 | return; |
| 502 | |
| 503 | for (i = 0; i < len; i++) { |
| 504 | cn_check_magic(sc->sc_tty->t_dev, buf[i], xencons_cnm_state); |
| 505 | (*tp->t_linesw->l_rint)(buf[i], tp); |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | /* privileged receive callback */ |
| 510 | int |
| 511 | xencons_intr(void *p) |
| 512 | { |
| 513 | static char rbuf[16]; |
| 514 | int len; |
| 515 | struct xencons_softc *sc = p; |
| 516 | |
| 517 | if (sc == NULL) |
| 518 | /* Interrupt may happen during resume */ |
| 519 | return 1; |
| 520 | |
| 521 | if (sc->polling) |
| 522 | return 1; |
| 523 | |
| 524 | while ((len = |
| 525 | HYPERVISOR_console_io(CONSOLEIO_read, sizeof(rbuf), rbuf)) > 0) { |
| 526 | xencons_tty_input(sc, rbuf, len); |
| 527 | } |
| 528 | return 1; |
| 529 | } |
| 530 | |
| 531 | void |
| 532 | xenconscn_attach(void) |
| 533 | { |
| 534 | |
| 535 | cn_tab = &xencons; |
| 536 | |
| 537 | /* console ring mapped in locore.S */ |
| 538 | |
| 539 | cn_init_magic(&xencons_cnm_state); |
| 540 | cn_set_magic("+++++" ); |
| 541 | |
| 542 | xencons_isconsole = 1; |
| 543 | } |
| 544 | |
| 545 | int |
| 546 | xenconscn_getc(dev_t dev) |
| 547 | { |
| 548 | char c; |
| 549 | int s = spltty(); |
| 550 | XENCONS_RING_IDX cons, prod; |
| 551 | |
| 552 | if (xencons_console_device && xencons_console_device->polling == 0) { |
| 553 | printf("xenconscn_getc() but not polling\n" ); |
| 554 | splx(s); |
| 555 | return 0; |
| 556 | } |
| 557 | if (xendomain_is_dom0()) { |
| 558 | while (HYPERVISOR_console_io(CONSOLEIO_read, 1, &c) == 0) |
| 559 | ; |
| 560 | cn_check_magic(dev, c, xencons_cnm_state); |
| 561 | splx(s); |
| 562 | return c; |
| 563 | } |
| 564 | if (xencons_console_device == NULL) { |
| 565 | printf("xenconscn_getc(): not console\n" ); |
| 566 | while (1) |
| 567 | ; /* loop here instead of in ddb */ |
| 568 | splx(s); |
| 569 | return 0; |
| 570 | } |
| 571 | |
| 572 | if (xencons_console_device->polling == 0) { |
| 573 | printf("xenconscn_getc() but not polling\n" ); |
| 574 | splx(s); |
| 575 | return 0; |
| 576 | } |
| 577 | |
| 578 | cons = xencons_interface->in_cons; |
| 579 | prod = xencons_interface->in_prod; |
| 580 | xen_rmb(); |
| 581 | while (cons == prod) { |
| 582 | HYPERVISOR_yield(); |
| 583 | prod = xencons_interface->in_prod; |
| 584 | } |
| 585 | xen_rmb(); |
| 586 | c = xencons_interface->in[MASK_XENCONS_IDX(xencons_interface->in_cons, |
| 587 | xencons_interface->in)]; |
| 588 | xen_rmb(); |
| 589 | xencons_interface->in_cons = cons + 1; |
| 590 | cn_check_magic(dev, c, xencons_cnm_state); |
| 591 | splx(s); |
| 592 | return c; |
| 593 | } |
| 594 | |
| 595 | void |
| 596 | xenconscn_putc(dev_t dev, int c) |
| 597 | { |
| 598 | int s = spltty(); |
| 599 | XENCONS_RING_IDX cons, prod; |
| 600 | |
| 601 | if (xendomain_is_dom0()) { |
| 602 | u_char buf[1]; |
| 603 | |
| 604 | buf[0] = c; |
| 605 | (void)HYPERVISOR_console_io(CONSOLEIO_write, 1, buf); |
| 606 | } else { |
| 607 | XENPRINTK(("xenconscn_putc(%c)\n" , c)); |
| 608 | |
| 609 | cons = xencons_interface->out_cons; |
| 610 | prod = xencons_interface->out_prod; |
| 611 | xen_rmb(); |
| 612 | while (prod == cons + sizeof(xencons_interface->out)) { |
| 613 | cons = xencons_interface->out_cons; |
| 614 | prod = xencons_interface->out_prod; |
| 615 | xen_rmb(); |
| 616 | } |
| 617 | xencons_interface->out[MASK_XENCONS_IDX(xencons_interface->out_prod, |
| 618 | xencons_interface->out)] = c; |
| 619 | xen_rmb(); |
| 620 | xencons_interface->out_prod++; |
| 621 | xen_rmb(); |
| 622 | hypervisor_notify_via_evtchn(xen_start_info.console.domU.evtchn); |
| 623 | splx(s); |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | void |
| 628 | xenconscn_pollc(dev_t dev, int on) |
| 629 | { |
| 630 | if (xencons_console_device) |
| 631 | xencons_console_device->polling = on; |
| 632 | } |
| 633 | |
| 634 | /* |
| 635 | * Set line parameters. |
| 636 | */ |
| 637 | int |
| 638 | xencons_param(struct tty *tp, struct termios *t) |
| 639 | { |
| 640 | |
| 641 | tp->t_ispeed = t->c_ispeed; |
| 642 | tp->t_ospeed = t->c_ospeed; |
| 643 | tp->t_cflag = t->c_cflag; |
| 644 | return (0); |
| 645 | } |
| 646 | |