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: src/sys/kern/init_main.c,v 1.134.2.8 2003/06/06 20:21:32 tegge Exp $ 43 * $DragonFly: src/sys/kern/init_main.c,v 1.36 2004/09/20 06:32:58 dillon Exp $ 44 */ 45 46 #include "opt_init_path.h" 47 48 #include <sys/param.h> 49 #include <sys/file.h> 50 #include <sys/filedesc.h> 51 #include <sys/kernel.h> 52 #include <sys/mount.h> 53 #include <sys/sysctl.h> 54 #include <sys/proc.h> 55 #include <sys/resourcevar.h> 56 #include <sys/signalvar.h> 57 #include <sys/systm.h> 58 #include <sys/vnode.h> 59 #include <sys/sysent.h> 60 #include <sys/reboot.h> 61 #include <sys/sysproto.h> 62 #include <sys/vmmeter.h> 63 #include <sys/unistd.h> 64 #include <sys/malloc.h> 65 #include <sys/file2.h> 66 #include <sys/thread2.h> 67 68 #include <machine/cpu.h> 69 70 #include <vm/vm.h> 71 #include <vm/vm_param.h> 72 #include <sys/lock.h> 73 #include <vm/pmap.h> 74 #include <vm/vm_map.h> 75 #include <sys/user.h> 76 #include <sys/copyright.h> 77 78 void mi_startup(void); /* Should be elsewhere */ 79 80 /* Components of the first process -- never freed. */ 81 static struct session session0; 82 static struct pgrp pgrp0; 83 static struct procsig procsig0; 84 static struct filedesc0 filedesc0; 85 static struct plimit limit0; 86 static struct vmspace vmspace0; 87 struct proc *initproc; 88 struct proc proc0; 89 struct thread thread0; 90 91 int cmask = CMASK; 92 extern struct user *proc0paddr; 93 extern int fallback_elf_brand; 94 95 struct vnode *rootvp; 96 int boothowto = 0; /* initialized so that it can be patched */ 97 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, ""); 98 99 /* 100 * This ensures that there is at least one entry so that the sysinit_set 101 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 102 * executed. 103 */ 104 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL) 105 106 /* 107 * The sysinit table itself. Items are checked off as the are run. 108 * If we want to register new sysinit types, add them to newsysinit. 109 */ 110 SET_DECLARE(sysinit_set, struct sysinit); 111 struct sysinit **sysinit, **sysinit_end; 112 struct sysinit **newsysinit, **newsysinit_end; 113 114 115 /* 116 * Merge a new sysinit set into the current set, reallocating it if 117 * necessary. This can only be called after malloc is running. 118 */ 119 void 120 sysinit_add(struct sysinit **set, struct sysinit **set_end) 121 { 122 struct sysinit **newset; 123 struct sysinit **sipp; 124 struct sysinit **xipp; 125 int count; 126 127 count = set_end - set; 128 if (newsysinit) 129 count += newsysinit_end - newsysinit; 130 else 131 count += sysinit_end - sysinit; 132 newset = malloc(count * sizeof(*sipp), M_TEMP, M_WAITOK); 133 if (newset == NULL) 134 panic("cannot malloc for sysinit"); 135 xipp = newset; 136 if (newsysinit) { 137 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 138 *xipp++ = *sipp; 139 } else { 140 for (sipp = sysinit; sipp < sysinit_end; sipp++) 141 *xipp++ = *sipp; 142 } 143 for (sipp = set; sipp < set_end; sipp++) 144 *xipp++ = *sipp; 145 if (newsysinit) 146 free(newsysinit, M_TEMP); 147 newsysinit = newset; 148 newsysinit_end = newset + count; 149 } 150 151 /* 152 * System startup; initialize the world, create process 0, mount root 153 * filesystem, and fork to create init and pagedaemon. Most of the 154 * hard work is done in the lower-level initialization routines including 155 * startup(), which does memory initialization and autoconfiguration. 156 * 157 * This allows simple addition of new kernel subsystems that require 158 * boot time initialization. It also allows substitution of subsystem 159 * (for instance, a scheduler, kernel profiler, or VM system) by object 160 * module. Finally, it allows for optional "kernel threads". 161 */ 162 void 163 mi_startup(void) 164 { 165 struct sysinit *sip; /* system initialization*/ 166 struct sysinit **sipp; /* system initialization*/ 167 struct sysinit **xipp; /* interior loop of sort*/ 168 struct sysinit *save; /* bubble*/ 169 170 if (sysinit == NULL) { 171 sysinit = SET_BEGIN(sysinit_set); 172 sysinit_end = SET_LIMIT(sysinit_set); 173 } 174 175 restart: 176 /* 177 * Perform a bubble sort of the system initialization objects by 178 * their subsystem (primary key) and order (secondary key). 179 */ 180 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 181 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 182 if ((*sipp)->subsystem < (*xipp)->subsystem || 183 ((*sipp)->subsystem == (*xipp)->subsystem && 184 (*sipp)->order <= (*xipp)->order)) 185 continue; /* skip*/ 186 save = *sipp; 187 *sipp = *xipp; 188 *xipp = save; 189 } 190 } 191 192 /* 193 * Traverse the (now) ordered list of system initialization tasks. 194 * Perform each task, and continue on to the next task. 195 * 196 * The last item on the list is expected to be the scheduler, 197 * which will not return. 198 */ 199 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 200 sip = *sipp; 201 if (sip->subsystem == SI_SUB_DUMMY) 202 continue; /* skip dummy task(s)*/ 203 204 if (sip->subsystem == SI_SUB_DONE) 205 continue; 206 207 /* Call function */ 208 (*(sip->func))(sip->udata); 209 210 /* Check off the one we're just done */ 211 sip->subsystem = SI_SUB_DONE; 212 213 /* Check if we've installed more sysinit items via KLD */ 214 if (newsysinit != NULL) { 215 if (sysinit != SET_BEGIN(sysinit_set)) 216 free(sysinit, M_TEMP); 217 sysinit = newsysinit; 218 sysinit_end = newsysinit_end; 219 newsysinit = NULL; 220 newsysinit_end = NULL; 221 goto restart; 222 } 223 } 224 225 panic("Shouldn't get here!"); 226 /* NOTREACHED*/ 227 } 228 229 230 /* 231 *************************************************************************** 232 **** 233 **** The following SYSINIT's belong elsewhere, but have not yet 234 **** been moved. 235 **** 236 *************************************************************************** 237 */ 238 static void 239 print_caddr_t(void *data __unused) 240 { 241 printf("%s", (char *)data); 242 } 243 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright) 244 245 /* 246 * Leave the critical section that protected us from spurious interrupts 247 * so device probes work. 248 */ 249 static void 250 leavecrit(void *dummy __unused) 251 { 252 crit_exit(); 253 KKASSERT(!IN_CRITICAL_SECT(curthread)); 254 if (bootverbose) 255 printf("Leaving critical section, allowing interrupts\n"); 256 } 257 SYSINIT(leavecrit, SI_SUB_LEAVE_CRIT, SI_ORDER_ANY, leavecrit, NULL) 258 259 /* 260 *************************************************************************** 261 **** 262 **** The two following SYSINT's are proc0 specific glue code. I am not 263 **** convinced that they can not be safely combined, but their order of 264 **** operation has been maintained as the same as the original init_main.c 265 **** for right now. 266 **** 267 **** These probably belong in init_proc.c or kern_proc.c, since they 268 **** deal with proc0 (the fork template process). 269 **** 270 *************************************************************************** 271 */ 272 /* ARGSUSED*/ 273 static void 274 proc0_init(void *dummy __unused) 275 { 276 struct proc *p; 277 struct filedesc0 *fdp; 278 unsigned i; 279 280 p = &proc0; 281 282 /* 283 * Initialize process and pgrp structures. 284 */ 285 procinit(); 286 287 /* 288 * Initialize sleep queue hash table 289 */ 290 sleepinit(); 291 292 /* 293 * additional VM structures 294 */ 295 vm_init2(); 296 297 /* 298 * Create process 0 (the swapper). 299 */ 300 LIST_INSERT_HEAD(&allproc, p, p_list); 301 p->p_pgrp = &pgrp0; 302 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 303 LIST_INIT(&pgrp0.pg_members); 304 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 305 306 pgrp0.pg_session = &session0; 307 session0.s_count = 1; 308 session0.s_leader = p; 309 310 p->p_sysent = &aout_sysvec; 311 TAILQ_INIT(&p->p_sysmsgq); 312 313 p->p_flag = P_INMEM | P_SYSTEM; 314 p->p_stat = SRUN; 315 p->p_nice = NZERO; 316 p->p_rtprio.type = RTP_PRIO_NORMAL; 317 p->p_rtprio.prio = 0; 318 319 p->p_peers = 0; 320 p->p_leader = p; 321 322 bcopy("swapper", p->p_comm, sizeof ("swapper")); 323 324 /* Create credentials. */ 325 p->p_ucred = crget(); 326 p->p_ucred->cr_ruidinfo = uifind(0); 327 p->p_ucred->cr_ngroups = 1; /* group 0 */ 328 p->p_ucred->cr_uidinfo = uifind(0); 329 330 /* Don't jail it */ 331 p->p_ucred->cr_prison = NULL; 332 333 /* Create procsig. */ 334 p->p_procsig = &procsig0; 335 p->p_procsig->ps_refcnt = 1; 336 337 /* Initialize signal state for process 0. */ 338 siginit(&proc0); 339 340 /* Create the file descriptor table. */ 341 fdp = &filedesc0; 342 p->p_fd = &fdp->fd_fd; 343 p->p_fdtol = NULL; 344 fdp->fd_fd.fd_refcnt = 1; 345 fdp->fd_fd.fd_cmask = cmask; 346 fdp->fd_fd.fd_ofiles = fdp->fd_dfiles; 347 fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags; 348 fdp->fd_fd.fd_nfiles = NDFILE; 349 350 /* Create the limits structures. */ 351 p->p_limit = &limit0; 352 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 353 limit0.pl_rlimit[i].rlim_cur = 354 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 355 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = 356 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 357 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = 358 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 359 i = ptoa(vmstats.v_free_count); 360 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 361 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 362 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 363 limit0.p_cpulimit = RLIM_INFINITY; 364 limit0.p_refcnt = 1; 365 366 /* Allocate a prototype map so we have something to fork. */ 367 pmap_pinit0(vmspace_pmap(&vmspace0)); 368 p->p_vmspace = &vmspace0; 369 vmspace0.vm_refcnt = 1; 370 vm_map_init(&vmspace0.vm_map, round_page(VM_MIN_ADDRESS), 371 trunc_page(VM_MAXUSER_ADDRESS)); 372 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0); 373 374 /* 375 * We continue to place resource usage info and signal 376 * actions in the user struct so they're pageable. 377 */ 378 p->p_stats = &p->p_addr->u_stats; 379 p->p_sigacts = &p->p_addr->u_sigacts; 380 381 /* 382 * Charge root for one process. 383 */ 384 (void)chgproccnt(p->p_ucred->cr_uidinfo, 1, 0); 385 386 } 387 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL) 388 389 /* ARGSUSED*/ 390 static void 391 proc0_post(void *dummy __unused) 392 { 393 struct timespec ts; 394 struct proc *p; 395 396 /* 397 * Now we can look at the time, having had a chance to verify the 398 * time from the file system. Pretend that proc0 started now. 399 */ 400 FOREACH_PROC_IN_SYSTEM(p) { 401 microtime(&p->p_thread->td_start); 402 } 403 404 /* 405 * Give the ``random'' number generator a thump. 406 * XXX: Does read_random() contain enough bits to be used here ? 407 */ 408 nanotime(&ts); 409 srandom(ts.tv_sec ^ ts.tv_nsec); 410 } 411 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL) 412 413 /* 414 *************************************************************************** 415 **** 416 **** The following SYSINIT's and glue code should be moved to the 417 **** respective files on a per subsystem basis. 418 **** 419 *************************************************************************** 420 */ 421 422 423 /* 424 *************************************************************************** 425 **** 426 **** The following code probably belongs in another file, like 427 **** kern/init_init.c. 428 **** 429 *************************************************************************** 430 */ 431 432 /* 433 * List of paths to try when searching for "init". 434 */ 435 static char init_path[MAXPATHLEN] = 436 #ifdef INIT_PATH 437 __XSTRING(INIT_PATH); 438 #else 439 "/sbin/init:/sbin/oinit:/sbin/init.bak:/stand/sysinstall"; 440 #endif 441 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, ""); 442 443 /* 444 * Start the initial user process; try exec'ing each pathname in init_path. 445 * The program is invoked with one argument containing the boot flags. 446 * 447 * The MP lock is held on entry. 448 */ 449 static void 450 start_init(void *dummy) 451 { 452 vm_offset_t addr; 453 struct execve_args args; 454 int options, error; 455 char *var, *path, *next, *s; 456 char *ucp, **uap, *arg0, *arg1; 457 struct proc *p; 458 459 p = curproc; 460 461 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */ 462 if (VFS_ROOT(TAILQ_FIRST(&mountlist), &rootvnode)) 463 panic("cannot find root vnode"); 464 p->p_fd->fd_cdir = rootvnode; 465 vref(p->p_fd->fd_cdir); 466 p->p_fd->fd_rdir = rootvnode; 467 vref(p->p_fd->fd_rdir); 468 vfs_cache_setroot(rootvnode); 469 VOP_UNLOCK(rootvnode, NULL, 0, curthread); 470 471 /* 472 * Need just enough stack to hold the faked-up "execve()" arguments. 473 */ 474 addr = trunc_page(USRSTACK - PAGE_SIZE); 475 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 476 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 477 panic("init: couldn't allocate argument space"); 478 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 479 p->p_vmspace->vm_ssize = 1; 480 481 if ((var = getenv("init_path")) != NULL) { 482 strncpy(init_path, var, sizeof init_path); 483 init_path[sizeof init_path - 1] = 0; 484 } 485 if ((var = getenv("kern.fallback_elf_brand")) != NULL) 486 fallback_elf_brand = strtol(var, NULL, 0); 487 488 for (path = init_path; *path != '\0'; path = next) { 489 while (*path == ':') 490 path++; 491 if (*path == '\0') 492 break; 493 for (next = path; *next != '\0' && *next != ':'; next++) 494 /* nothing */ ; 495 if (bootverbose) 496 printf("start_init: trying %.*s\n", (int)(next - path), 497 path); 498 499 /* 500 * Move out the boot flag argument. 501 */ 502 options = 0; 503 ucp = (char *)USRSTACK; 504 (void)subyte(--ucp, 0); /* trailing zero */ 505 if (boothowto & RB_SINGLE) { 506 (void)subyte(--ucp, 's'); 507 options = 1; 508 } 509 #ifdef notyet 510 if (boothowto & RB_FASTBOOT) { 511 (void)subyte(--ucp, 'f'); 512 options = 1; 513 } 514 #endif 515 516 #ifdef BOOTCDROM 517 (void)subyte(--ucp, 'C'); 518 options = 1; 519 #endif 520 if (options == 0) 521 (void)subyte(--ucp, '-'); 522 (void)subyte(--ucp, '-'); /* leading hyphen */ 523 arg1 = ucp; 524 525 /* 526 * Move out the file name (also arg 0). 527 */ 528 (void)subyte(--ucp, 0); 529 for (s = next - 1; s >= path; s--) 530 (void)subyte(--ucp, *s); 531 arg0 = ucp; 532 533 /* 534 * Move out the arg pointers. 535 */ 536 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 537 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 538 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 539 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 540 541 /* 542 * Point at the arguments. 543 */ 544 args.fname = arg0; 545 args.argv = uap; 546 args.envv = NULL; 547 548 /* 549 * Now try to exec the program. If can't for any reason 550 * other than it doesn't exist, complain. 551 * 552 * Otherwise, return via fork_trampoline() all the way 553 * to user mode as init! 554 * 555 * WARNING! We may have been moved to another cpu after 556 * acquiring the current user process designation. The 557 * MP lock will migrate with us though so we still have to 558 * release it. 559 */ 560 if ((error = execve(&args)) == 0) { 561 if (p->p_thread->td_gd->gd_uschedcp != p) 562 acquire_curproc(p); 563 rel_mplock(); 564 return; 565 } 566 if (error != ENOENT) 567 printf("exec %.*s: error %d\n", (int)(next - path), 568 path, error); 569 } 570 printf("init: not found in path %s\n", init_path); 571 panic("no init"); 572 } 573 574 /* 575 * Like kthread_create(), but runs in it's own address space. 576 * We do this early to reserve pid 1. 577 * 578 * Note special case - do not make it runnable yet. Other work 579 * in progress will change this more. 580 */ 581 static void 582 create_init(const void *udata __unused) 583 { 584 int error; 585 int s; 586 587 s = splhigh(); 588 error = fork1(&proc0, RFFDG | RFPROC, &initproc); 589 if (error) 590 panic("cannot fork init: %d", error); 591 initproc->p_flag |= P_INMEM | P_SYSTEM; 592 cpu_set_fork_handler(initproc, start_init, NULL); 593 splx(s); 594 } 595 SYSINIT(init,SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL) 596 597 /* 598 * Make it runnable now. 599 */ 600 static void 601 kick_init(const void *udata __unused) 602 { 603 start_forked_proc(&proc0, initproc); 604 } 605 SYSINIT(kickinit,SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL) 606 607 /* 608 * Machine independant globaldata initialization 609 * 610 * WARNING! Called from early boot, 'mycpu' may not work yet. 611 */ 612 void 613 mi_gdinit(struct globaldata *gd, int cpuid) 614 { 615 TAILQ_INIT(&gd->gd_tdfreeq); /* for pmap_{new,dispose}_thread() */ 616 TAILQ_INIT(&gd->gd_systimerq); 617 gd->gd_cpuid = cpuid; 618 gd->gd_cpumask = (cpumask_t)1 << cpuid; 619 lwkt_gdinit(gd); 620 vm_map_entry_reserve_cpu_init(gd); 621 } 622 623 624