1 /* 2 * Copyright (c) 1995 Terrence R. Lambert 3 * All rights reserved. 4 * 5 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * @(#)init_main.c 8.9 (Berkeley) 1/21/94 42 * $FreeBSD$ 43 */ 44 45 #include "opt_init_path.h" 46 47 #include <sys/param.h> 48 #include <sys/file.h> 49 #include <sys/filedesc.h> 50 #include <sys/kernel.h> 51 #include <sys/mount.h> 52 #include <sys/sysctl.h> 53 #include <sys/proc.h> 54 #include <sys/resourcevar.h> 55 #include <sys/signalvar.h> 56 #include <sys/systm.h> 57 #include <sys/vnode.h> 58 #include <sys/sysent.h> 59 #include <sys/reboot.h> 60 #include <sys/sysproto.h> 61 #include <sys/vmmeter.h> 62 #include <sys/unistd.h> 63 #include <sys/malloc.h> 64 65 #include <machine/cpu.h> 66 67 #include <vm/vm.h> 68 #include <vm/vm_param.h> 69 #include <sys/lock.h> 70 #include <vm/pmap.h> 71 #include <vm/vm_map.h> 72 #include <sys/user.h> 73 #include <sys/copyright.h> 74 75 extern struct linker_set sysinit_set; /* XXX */ 76 77 void mi_startup(void); /* Should be elsewhere */ 78 79 /* Components of the first process -- never freed. */ 80 static struct session session0; 81 static struct pgrp pgrp0; 82 struct proc proc0; 83 static struct pcred cred0; 84 static struct procsig procsig0; 85 static struct filedesc0 filedesc0; 86 static struct plimit limit0; 87 static struct vmspace vmspace0; 88 struct proc *initproc; 89 90 int cmask = CMASK; 91 extern struct user *proc0paddr; 92 93 struct vnode *rootvp; 94 int boothowto = 0; /* initialized so that it can be patched */ 95 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, ""); 96 97 /* 98 * This ensures that there is at least one entry so that the sysinit_set 99 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 100 * executed. 101 */ 102 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL) 103 104 /* 105 * The sysinit table itself. Items are checked off as the are run. 106 * If we want to register new sysinit types, add them to newsysinit. 107 */ 108 struct sysinit **sysinit = (struct sysinit **)sysinit_set.ls_items; 109 struct sysinit **newsysinit; 110 111 /* 112 * Merge a new sysinit set into the current set, reallocating it if 113 * necessary. This can only be called after malloc is running. 114 */ 115 void 116 sysinit_add(struct sysinit **set) 117 { 118 struct sysinit **newset; 119 struct sysinit **sipp; 120 struct sysinit **xipp; 121 int count = 0; 122 123 if (newsysinit) 124 for (sipp = newsysinit; *sipp; sipp++) 125 count++; 126 else 127 for (sipp = sysinit; *sipp; sipp++) 128 count++; 129 for (sipp = set; *sipp; sipp++) 130 count++; 131 count++; /* Trailing NULL */ 132 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 133 if (newset == NULL) 134 panic("cannot malloc for sysinit"); 135 xipp = newset; 136 if (newsysinit) 137 for (sipp = newsysinit; *sipp; sipp++) 138 *xipp++ = *sipp; 139 else 140 for (sipp = sysinit; *sipp; sipp++) 141 *xipp++ = *sipp; 142 for (sipp = set; *sipp; sipp++) 143 *xipp++ = *sipp; 144 *xipp = NULL; 145 if (newsysinit) 146 free(newsysinit, M_TEMP); 147 newsysinit = newset; 148 } 149 150 /* 151 * System startup; initialize the world, create process 0, mount root 152 * filesystem, and fork to create init and pagedaemon. Most of the 153 * hard work is done in the lower-level initialization routines including 154 * startup(), which does memory initialization and autoconfiguration. 155 * 156 * This allows simple addition of new kernel subsystems that require 157 * boot time initialization. It also allows substitution of subsystem 158 * (for instance, a scheduler, kernel profiler, or VM system) by object 159 * module. Finally, it allows for optional "kernel threads". 160 */ 161 void 162 mi_startup(void) 163 { 164 165 register struct sysinit **sipp; /* system initialization*/ 166 register struct sysinit **xipp; /* interior loop of sort*/ 167 register struct sysinit *save; /* bubble*/ 168 169 restart: 170 /* 171 * Perform a bubble sort of the system initialization objects by 172 * their subsystem (primary key) and order (secondary key). 173 */ 174 for (sipp = sysinit; *sipp; sipp++) { 175 for (xipp = sipp + 1; *xipp; xipp++) { 176 if ((*sipp)->subsystem < (*xipp)->subsystem || 177 ((*sipp)->subsystem == (*xipp)->subsystem && 178 (*sipp)->order <= (*xipp)->order)) 179 continue; /* skip*/ 180 save = *sipp; 181 *sipp = *xipp; 182 *xipp = save; 183 } 184 } 185 186 /* 187 * Traverse the (now) ordered list of system initialization tasks. 188 * Perform each task, and continue on to the next task. 189 * 190 * The last item on the list is expected to be the scheduler, 191 * which will not return. 192 */ 193 for (sipp = sysinit; *sipp; sipp++) { 194 195 if ((*sipp)->subsystem == SI_SUB_DUMMY) 196 continue; /* skip dummy task(s)*/ 197 198 if ((*sipp)->subsystem == SI_SUB_DONE) 199 continue; 200 201 /* Call function */ 202 (*((*sipp)->func))((*sipp)->udata); 203 204 /* Check off the one we're just done */ 205 (*sipp)->subsystem = SI_SUB_DONE; 206 207 /* Check if we've installed more sysinit items via KLD */ 208 if (newsysinit != NULL) { 209 if (sysinit != (struct sysinit **)sysinit_set.ls_items) 210 free(sysinit, M_TEMP); 211 sysinit = newsysinit; 212 newsysinit = NULL; 213 goto restart; 214 } 215 } 216 217 panic("Shouldn't get here!"); 218 /* NOTREACHED*/ 219 } 220 221 222 /* 223 *************************************************************************** 224 **** 225 **** The following SYSINIT's belong elsewhere, but have not yet 226 **** been moved. 227 **** 228 *************************************************************************** 229 */ 230 static void 231 print_caddr_t(void *data __unused) 232 { 233 printf("%s", (char *)data); 234 } 235 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright) 236 237 238 /* 239 *************************************************************************** 240 **** 241 **** The two following SYSINT's are proc0 specific glue code. I am not 242 **** convinced that they can not be safely combined, but their order of 243 **** operation has been maintained as the same as the original init_main.c 244 **** for right now. 245 **** 246 **** These probably belong in init_proc.c or kern_proc.c, since they 247 **** deal with proc0 (the fork template process). 248 **** 249 *************************************************************************** 250 */ 251 /* ARGSUSED*/ 252 static void 253 proc0_init(void *dummy __unused) 254 { 255 register struct proc *p; 256 register struct filedesc0 *fdp; 257 register unsigned i; 258 259 p = &proc0; 260 261 /* 262 * Initialize process and pgrp structures. 263 */ 264 procinit(); 265 266 /* 267 * Initialize sleep queue hash table 268 */ 269 sleepinit(); 270 271 /* 272 * additional VM structures 273 */ 274 vm_init2(); 275 276 /* 277 * Create process 0 (the swapper). 278 */ 279 LIST_INSERT_HEAD(&allproc, p, p_list); 280 p->p_pgrp = &pgrp0; 281 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 282 LIST_INIT(&pgrp0.pg_members); 283 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 284 285 pgrp0.pg_session = &session0; 286 session0.s_count = 1; 287 session0.s_leader = p; 288 289 p->p_sysent = &aout_sysvec; 290 291 p->p_flag = P_INMEM | P_SYSTEM; 292 p->p_stat = SRUN; 293 p->p_nice = NZERO; 294 p->p_rtprio.type = RTP_PRIO_NORMAL; 295 p->p_rtprio.prio = 0; 296 297 p->p_peers = 0; 298 p->p_leader = p; 299 300 bcopy("swapper", p->p_comm, sizeof ("swapper")); 301 302 /* Create credentials. */ 303 cred0.p_refcnt = 1; 304 p->p_cred = &cred0; 305 p->p_ucred = crget(); 306 p->p_ucred->cr_ngroups = 1; /* group 0 */ 307 308 /* Don't jail it */ 309 p->p_prison = 0; 310 311 /* Create procsig. */ 312 p->p_procsig = &procsig0; 313 p->p_procsig->ps_refcnt = 1; 314 315 /* Initialize signal state for process 0. */ 316 siginit(&proc0); 317 318 /* Create the file descriptor table. */ 319 fdp = &filedesc0; 320 p->p_fd = &fdp->fd_fd; 321 fdp->fd_fd.fd_refcnt = 1; 322 fdp->fd_fd.fd_cmask = cmask; 323 fdp->fd_fd.fd_ofiles = fdp->fd_dfiles; 324 fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags; 325 fdp->fd_fd.fd_nfiles = NDFILE; 326 327 /* Create the limits structures. */ 328 p->p_limit = &limit0; 329 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 330 limit0.pl_rlimit[i].rlim_cur = 331 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 332 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = 333 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 334 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = 335 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 336 i = ptoa(cnt.v_free_count); 337 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 338 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 339 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 340 limit0.p_cpulimit = RLIM_INFINITY; 341 limit0.p_refcnt = 1; 342 343 /* Allocate a prototype map so we have something to fork. */ 344 pmap_pinit0(vmspace_pmap(&vmspace0)); 345 p->p_vmspace = &vmspace0; 346 vmspace0.vm_refcnt = 1; 347 vm_map_init(&vmspace0.vm_map, round_page(VM_MIN_ADDRESS), 348 trunc_page(VM_MAXUSER_ADDRESS)); 349 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0); 350 p->p_addr = proc0paddr; /* XXX */ 351 352 /* 353 * We continue to place resource usage info and signal 354 * actions in the user struct so they're pageable. 355 */ 356 p->p_stats = &p->p_addr->u_stats; 357 p->p_sigacts = &p->p_addr->u_sigacts; 358 359 /* 360 * Charge root for one process. 361 */ 362 (void)chgproccnt(0, 1, 0); 363 364 /* 365 * Initialize the current process pointer (curproc) before 366 * any possible traps/probes to simplify trap processing. 367 */ 368 SET_CURPROC(p); 369 370 } 371 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL) 372 373 /* ARGSUSED*/ 374 static void 375 proc0_post(void *dummy __unused) 376 { 377 struct timespec ts; 378 struct proc *p; 379 380 /* 381 * Now we can look at the time, having had a chance to verify the 382 * time from the file system. Pretend that proc0 started now. 383 */ 384 LIST_FOREACH(p, &allproc, p_list) { 385 microtime(&p->p_stats->p_start); 386 p->p_runtime = 0; 387 } 388 microuptime(&switchtime); 389 switchticks = ticks; 390 391 /* 392 * Give the ``random'' number generator a thump. 393 */ 394 nanotime(&ts); 395 srandom(ts.tv_sec ^ ts.tv_nsec); 396 } 397 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL) 398 399 /* 400 *************************************************************************** 401 **** 402 **** The following SYSINIT's and glue code should be moved to the 403 **** respective files on a per subsystem basis. 404 **** 405 *************************************************************************** 406 */ 407 408 409 /* 410 *************************************************************************** 411 **** 412 **** The following code probably belongs in another file, like 413 **** kern/init_init.c. 414 **** 415 *************************************************************************** 416 */ 417 418 419 /* 420 * List of paths to try when searching for "init". 421 */ 422 static char init_path[MAXPATHLEN] = 423 #ifdef INIT_PATH 424 __XSTRING(INIT_PATH); 425 #else 426 "/sbin/init:/sbin/oinit:/sbin/init.bak:/stand/sysinstall"; 427 #endif 428 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, ""); 429 430 /* 431 * Start the initial user process; try exec'ing each pathname in init_path. 432 * The program is invoked with one argument containing the boot flags. 433 */ 434 static void 435 start_init(void *dummy) 436 { 437 vm_offset_t addr; 438 struct execve_args args; 439 int options, error; 440 char *var, *path, *next, *s; 441 char *ucp, **uap, *arg0, *arg1; 442 struct proc *p; 443 444 p = curproc; 445 446 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */ 447 if (VFS_ROOT(TAILQ_FIRST(&mountlist), &rootvnode)) 448 panic("cannot find root vnode"); 449 p->p_fd->fd_cdir = rootvnode; 450 VREF(p->p_fd->fd_cdir); 451 p->p_fd->fd_rdir = rootvnode; 452 VOP_UNLOCK(rootvnode, 0, p); 453 454 /* 455 * Need just enough stack to hold the faked-up "execve()" arguments. 456 */ 457 addr = trunc_page(USRSTACK - PAGE_SIZE); 458 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 459 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 460 panic("init: couldn't allocate argument space"); 461 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 462 p->p_vmspace->vm_ssize = 1; 463 464 if ((var = getenv("init_path")) != NULL) { 465 strncpy(init_path, var, sizeof init_path); 466 init_path[sizeof init_path - 1] = 0; 467 } 468 469 for (path = init_path; *path != '\0'; path = next) { 470 while (*path == ':') 471 path++; 472 if (*path == '\0') 473 break; 474 for (next = path; *next != '\0' && *next != ':'; next++) 475 /* nothing */ ; 476 if (bootverbose) 477 printf("start_init: trying %.*s\n", (int)(next - path), 478 path); 479 480 /* 481 * Move out the boot flag argument. 482 */ 483 options = 0; 484 ucp = (char *)USRSTACK; 485 (void)subyte(--ucp, 0); /* trailing zero */ 486 if (boothowto & RB_SINGLE) { 487 (void)subyte(--ucp, 's'); 488 options = 1; 489 } 490 #ifdef notyet 491 if (boothowto & RB_FASTBOOT) { 492 (void)subyte(--ucp, 'f'); 493 options = 1; 494 } 495 #endif 496 497 #ifdef BOOTCDROM 498 (void)subyte(--ucp, 'C'); 499 options = 1; 500 #endif 501 if (options == 0) 502 (void)subyte(--ucp, '-'); 503 (void)subyte(--ucp, '-'); /* leading hyphen */ 504 arg1 = ucp; 505 506 /* 507 * Move out the file name (also arg 0). 508 */ 509 (void)subyte(--ucp, 0); 510 for (s = next - 1; s >= path; s--) 511 (void)subyte(--ucp, *s); 512 arg0 = ucp; 513 514 /* 515 * Move out the arg pointers. 516 */ 517 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 518 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 519 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 520 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 521 522 /* 523 * Point at the arguments. 524 */ 525 args.fname = arg0; 526 args.argv = uap; 527 args.envv = NULL; 528 529 /* 530 * Now try to exec the program. If can't for any reason 531 * other than it doesn't exist, complain. 532 * 533 * Otherwise, return via fork_trampoline() all the way 534 * to user mode as init! 535 */ 536 if ((error = execve(p, &args)) == 0) 537 return; 538 if (error != ENOENT) 539 printf("exec %.*s: error %d\n", (int)(next - path), 540 path, error); 541 } 542 printf("init: not found in path %s\n", init_path); 543 panic("no init"); 544 } 545 546 /* 547 * Like kthread_create(), but runs in it's own address space. 548 * We do this early to reserve pid 1. 549 * 550 * Note special case - do not make it runnable yet. Other work 551 * in progress will change this more. 552 */ 553 static void 554 create_init(const void *udata __unused) 555 { 556 int error; 557 int s; 558 559 s = splhigh(); 560 error = fork1(&proc0, RFFDG | RFPROC, &initproc); 561 if (error) 562 panic("cannot fork init: %d\n", error); 563 initproc->p_flag |= P_INMEM | P_SYSTEM; 564 cpu_set_fork_handler(initproc, start_init, NULL); 565 remrunqueue(initproc); 566 splx(s); 567 } 568 SYSINIT(init,SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL) 569 570 /* 571 * Make it runnable now. 572 */ 573 static void 574 kick_init(const void *udata __unused) 575 { 576 setrunqueue(initproc); 577 } 578 SYSINIT(kickinit,SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL) 579