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 #include <sys/kdb.h> 39 #include <gdb/gdb.h> 40 #include <sys/kernel.h> 41 #include <sys/module.h> 42 #include <sys/systm.h> 43 #include <sys/types.h> 44 #include <sys/conf.h> 45 #include <sys/cons.h> 46 #include <sys/consio.h> 47 #include <sys/tty.h> 48 #include <sys/malloc.h> 49 #include <sys/priv.h> 50 #include <sys/proc.h> 51 #include <sys/ucred.h> 52 53 #include <machine/bus.h> 54 55 #include <dev/dcons/dcons.h> 56 #include <dev/dcons/dcons_os.h> 57 58 #include <ddb/ddb.h> 59 #include <sys/reboot.h> 60 61 #include <sys/sysctl.h> 62 63 #include <vm/vm.h> 64 #include <vm/vm_param.h> 65 #include <vm/pmap.h> 66 67 #include "opt_dcons.h" 68 #include "opt_kdb.h" 69 #include "opt_gdb.h" 70 #include "opt_ddb.h" 71 72 73 #ifndef DCONS_POLL_HZ 74 #define DCONS_POLL_HZ 25 75 #endif 76 77 #ifndef DCONS_BUF_SIZE 78 #define DCONS_BUF_SIZE (16*1024) 79 #endif 80 81 #ifndef DCONS_FORCE_CONSOLE 82 #define DCONS_FORCE_CONSOLE 0 /* Mostly for FreeBSD-4/DragonFly */ 83 #endif 84 85 #ifndef KLD_MODULE 86 static char bssbuf[DCONS_BUF_SIZE]; /* buf in bss */ 87 #endif 88 89 /* global data */ 90 static struct dcons_global dg; 91 struct dcons_global *dcons_conf; 92 static int poll_hz = DCONS_POLL_HZ; 93 94 static struct dcons_softc sc[DCONS_NPORT]; 95 96 static SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console"); 97 SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0, 98 "dcons polling rate"); 99 100 static int drv_init = 0; 101 static struct callout dcons_callout; 102 struct dcons_buf *dcons_buf; /* for local dconschat */ 103 104 static void dcons_timeout(void *); 105 static int dcons_drv_init(int); 106 107 static cn_probe_t dcons_cnprobe; 108 static cn_init_t dcons_cninit; 109 static cn_term_t dcons_cnterm; 110 static cn_getc_t dcons_cngetc; 111 static cn_putc_t dcons_cnputc; 112 113 CONSOLE_DRIVER(dcons); 114 115 #if defined(GDB) 116 static gdb_probe_f dcons_dbg_probe; 117 static gdb_init_f dcons_dbg_init; 118 static gdb_term_f dcons_dbg_term; 119 static gdb_getc_f dcons_dbg_getc; 120 static gdb_putc_f dcons_dbg_putc; 121 122 GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term, 123 dcons_dbg_getc, dcons_dbg_putc); 124 125 extern struct gdb_dbgport *gdb_cur; 126 #endif 127 128 static tsw_outwakeup_t dcons_outwakeup; 129 130 static struct ttydevsw dcons_ttydevsw = { 131 .tsw_flags = TF_NOPREFIX, 132 .tsw_outwakeup = dcons_outwakeup, 133 }; 134 135 #if (defined(GDB) || defined(DDB)) 136 static int 137 dcons_check_break(struct dcons_softc *dc, int c) 138 { 139 140 if (c < 0) 141 return (c); 142 143 #ifdef GDB 144 if ((dc->flags & DC_GDB) != 0 && gdb_cur == &dcons_gdb_dbgport) 145 kdb_alt_break_gdb(c, &dc->brk_state); 146 else 147 #endif 148 kdb_alt_break(c, &dc->brk_state); 149 150 return (c); 151 } 152 #else 153 #define dcons_check_break(dc, c) (c) 154 #endif 155 156 static int 157 dcons_os_checkc_nopoll(struct dcons_softc *dc) 158 { 159 int c; 160 161 if (dg.dma_tag != NULL) 162 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD); 163 164 c = dcons_check_break(dc, dcons_checkc(dc)); 165 166 if (dg.dma_tag != NULL) 167 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD); 168 169 return (c); 170 } 171 172 static int 173 dcons_os_checkc(struct dcons_softc *dc) 174 { 175 EVENTHANDLER_INVOKE(dcons_poll, 0); 176 return (dcons_os_checkc_nopoll(dc)); 177 } 178 179 static void 180 dcons_os_putc(struct dcons_softc *dc, int c) 181 { 182 if (dg.dma_tag != NULL) 183 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE); 184 185 dcons_putc(dc, c); 186 187 if (dg.dma_tag != NULL) 188 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE); 189 } 190 191 static void 192 dcons_outwakeup(struct tty *tp) 193 { 194 struct dcons_softc *dc; 195 char ch; 196 197 dc = tty_softc(tp); 198 199 while (ttydisc_getc(tp, &ch, sizeof ch) != 0) 200 dcons_os_putc(dc, ch); 201 } 202 203 static void 204 dcons_timeout(void *v) 205 { 206 struct tty *tp; 207 struct dcons_softc *dc; 208 int i, c, polltime; 209 210 for (i = 0; i < DCONS_NPORT; i ++) { 211 dc = &sc[i]; 212 tp = dc->tty; 213 214 tty_lock(tp); 215 while ((c = dcons_os_checkc_nopoll(dc)) != -1) 216 ttydisc_rint(tp, c, 0); 217 ttydisc_rint_done(tp); 218 tty_unlock(tp); 219 } 220 polltime = hz / poll_hz; 221 if (polltime < 1) 222 polltime = 1; 223 callout_reset(&dcons_callout, polltime, dcons_timeout, tp); 224 } 225 226 static void 227 dcons_cnprobe(struct consdev *cp) 228 { 229 sprintf(cp->cn_name, "dcons"); 230 #if DCONS_FORCE_CONSOLE 231 cp->cn_pri = CN_REMOTE; 232 #else 233 cp->cn_pri = CN_NORMAL; 234 #endif 235 } 236 237 static void 238 dcons_cninit(struct consdev *cp) 239 { 240 dcons_drv_init(0); 241 cp->cn_arg = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */ 242 } 243 244 static void 245 dcons_cnterm(struct consdev *cp) 246 { 247 } 248 249 static int 250 dcons_cngetc(struct consdev *cp) 251 { 252 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 253 return (dcons_os_checkc(dc)); 254 } 255 256 static void 257 dcons_cnputc(struct consdev *cp, int c) 258 { 259 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg; 260 dcons_os_putc(dc, c); 261 } 262 263 static int 264 dcons_drv_init(int stage) 265 { 266 #if defined(__i386__) || defined(__amd64__) 267 quad_t addr, size; 268 #endif 269 270 if (drv_init) 271 return(drv_init); 272 273 drv_init = -1; 274 275 bzero(&dg, sizeof(dg)); 276 dcons_conf = &dg; 277 dg.cdev = &dcons_consdev; 278 dg.buf = NULL; 279 dg.size = DCONS_BUF_SIZE; 280 281 #if defined(__i386__) || defined(__amd64__) 282 if (getenv_quad("dcons.addr", &addr) > 0 && 283 getenv_quad("dcons.size", &size) > 0) { 284 #ifdef __i386__ 285 vm_paddr_t pa; 286 /* 287 * Allow read/write access to dcons buffer. 288 */ 289 for (pa = trunc_page(addr); pa < addr + size; pa += PAGE_SIZE) 290 *vtopte(KERNBASE + pa) |= PG_RW; 291 invltlb(); 292 #endif 293 /* XXX P to V */ 294 dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr); 295 dg.size = size; 296 if (dcons_load_buffer(dg.buf, dg.size, sc) < 0) 297 dg.buf = NULL; 298 } 299 #endif 300 if (dg.buf != NULL) 301 goto ok; 302 303 #ifndef KLD_MODULE 304 if (stage == 0) { /* XXX or cold */ 305 /* 306 * DCONS_FORCE_CONSOLE == 1 and statically linked. 307 * called from cninit(). can't use contigmalloc yet . 308 */ 309 dg.buf = (struct dcons_buf *) bssbuf; 310 dcons_init(dg.buf, dg.size, sc); 311 } else 312 #endif 313 { 314 /* 315 * DCONS_FORCE_CONSOLE == 0 or kernel module case. 316 * if the module is loaded after boot, 317 * bssbuf could be non-continuous. 318 */ 319 dg.buf = (struct dcons_buf *) contigmalloc(dg.size, 320 M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul); 321 if (dg.buf == NULL) 322 return (-1); 323 dcons_init(dg.buf, dg.size, sc); 324 } 325 326 ok: 327 dcons_buf = dg.buf; 328 329 drv_init = 1; 330 331 return 0; 332 } 333 334 335 static int 336 dcons_attach_port(int port, char *name, int flags) 337 { 338 struct dcons_softc *dc; 339 struct tty *tp; 340 341 dc = &sc[port]; 342 tp = tty_alloc(&dcons_ttydevsw, dc); 343 dc->flags = flags; 344 dc->tty = tp; 345 tty_init_console(tp, 0); 346 tty_makedev(tp, NULL, "%s", name); 347 return(0); 348 } 349 350 static int 351 dcons_attach(void) 352 { 353 int polltime; 354 355 dcons_attach_port(DCONS_CON, "dcons", 0); 356 dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB); 357 callout_init(&dcons_callout, CALLOUT_MPSAFE); 358 polltime = hz / poll_hz; 359 if (polltime < 1) 360 polltime = 1; 361 callout_reset(&dcons_callout, polltime, dcons_timeout, NULL); 362 return(0); 363 } 364 365 static int 366 dcons_detach(int port) 367 { 368 struct tty *tp; 369 struct dcons_softc *dc; 370 371 dc = &sc[port]; 372 tp = dc->tty; 373 374 tty_lock(tp); 375 tty_rel_gone(tp); 376 377 return(0); 378 } 379 380 static int 381 dcons_modevent(module_t mode, int type, void *data) 382 { 383 int err = 0, ret; 384 385 switch (type) { 386 case MOD_LOAD: 387 ret = dcons_drv_init(1); 388 if (ret != -1) 389 dcons_attach(); 390 if (ret == 0) { 391 dcons_cnprobe(&dcons_consdev); 392 dcons_cninit(&dcons_consdev); 393 cnadd(&dcons_consdev); 394 } 395 break; 396 case MOD_UNLOAD: 397 printf("dcons: unload\n"); 398 if (drv_init == 1) { 399 callout_stop(&dcons_callout); 400 cnremove(&dcons_consdev); 401 dcons_detach(DCONS_CON); 402 dcons_detach(DCONS_GDB); 403 dg.buf->magic = 0; 404 405 contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF); 406 } 407 408 break; 409 case MOD_SHUTDOWN: 410 #if 0 /* Keep connection after halt */ 411 dg.buf->magic = 0; 412 #endif 413 break; 414 default: 415 err = EOPNOTSUPP; 416 break; 417 } 418 return(err); 419 } 420 421 #if defined(GDB) 422 /* Debugger interface */ 423 424 static int 425 dcons_os_getc(struct dcons_softc *dc) 426 { 427 int c; 428 429 while ((c = dcons_os_checkc(dc)) == -1); 430 431 return (c & 0xff); 432 } 433 434 static int 435 dcons_dbg_probe(void) 436 { 437 int dcons_gdb; 438 439 if (getenv_int("dcons_gdb", &dcons_gdb) == 0) 440 return (-1); 441 return (dcons_gdb); 442 } 443 444 static void 445 dcons_dbg_init(void) 446 { 447 } 448 449 static void 450 dcons_dbg_term(void) 451 { 452 } 453 454 static void 455 dcons_dbg_putc(int c) 456 { 457 struct dcons_softc *dc = &sc[DCONS_GDB]; 458 dcons_os_putc(dc, c); 459 } 460 461 static int 462 dcons_dbg_getc(void) 463 { 464 struct dcons_softc *dc = &sc[DCONS_GDB]; 465 return (dcons_os_getc(dc)); 466 } 467 #endif 468 469 DEV_MODULE(dcons, dcons_modevent, NULL); 470 MODULE_VERSION(dcons, DCONS_VERSION); 471