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 1.22 2003/08/03 10:07:41 hmp 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 67 #include <machine/cpu.h> 68 69 #include <vm/vm.h> 70 #include <vm/vm_param.h> 71 #include <sys/lock.h> 72 #include <vm/pmap.h> 73 #include <vm/vm_map.h> 74 #include <sys/user.h> 75 #include <sys/copyright.h> 76 77 extern struct linker_set sysinit_set; /* XXX */ 78 79 void mi_startup(void); /* Should be elsewhere */ 80 81 /* Components of the first process -- never freed. */ 82 static struct session session0; 83 static struct pgrp pgrp0; 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 struct proc proc0; 90 struct thread thread0; 91 92 int cmask = CMASK; 93 extern struct user *proc0paddr; 94 extern int fallback_elf_brand; 95 96 struct vnode *rootvp; 97 int boothowto = 0; /* initialized so that it can be patched */ 98 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, ""); 99 100 /* 101 * This ensures that there is at least one entry so that the sysinit_set 102 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 103 * executed. 104 */ 105 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL) 106 107 /* 108 * The sysinit table itself. Items are checked off as the are run. 109 * If we want to register new sysinit types, add them to newsysinit. 110 */ 111 struct sysinit **sysinit = (struct sysinit **)sysinit_set.ls_items; 112 struct sysinit **newsysinit; 113 114 /* 115 * Merge a new sysinit set into the current set, reallocating it if 116 * necessary. This can only be called after malloc is running. 117 */ 118 void 119 sysinit_add(struct sysinit **set) 120 { 121 struct sysinit **newset; 122 struct sysinit **sipp; 123 struct sysinit **xipp; 124 int count = 0; 125 126 if (newsysinit) 127 for (sipp = newsysinit; *sipp; sipp++) 128 count++; 129 else 130 for (sipp = sysinit; *sipp; sipp++) 131 count++; 132 for (sipp = set; *sipp; sipp++) 133 count++; 134 count++; /* Trailing NULL */ 135 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 136 if (newset == NULL) 137 panic("cannot malloc for sysinit"); 138 xipp = newset; 139 if (newsysinit) 140 for (sipp = newsysinit; *sipp; sipp++) 141 *xipp++ = *sipp; 142 else 143 for (sipp = sysinit; *sipp; sipp++) 144 *xipp++ = *sipp; 145 for (sipp = set; *sipp; sipp++) 146 *xipp++ = *sipp; 147 *xipp = NULL; 148 if (newsysinit) 149 free(newsysinit, M_TEMP); 150 newsysinit = newset; 151 } 152 153 /* 154 * System startup; initialize the world, create process 0, mount root 155 * filesystem, and fork to create init and pagedaemon. Most of the 156 * hard work is done in the lower-level initialization routines including 157 * startup(), which does memory initialization and autoconfiguration. 158 * 159 * This allows simple addition of new kernel subsystems that require 160 * boot time initialization. It also allows substitution of subsystem 161 * (for instance, a scheduler, kernel profiler, or VM system) by object 162 * module. Finally, it allows for optional "kernel threads". 163 */ 164 void 165 mi_startup(void) 166 { 167 struct sysinit *sip; /* system initialization*/ 168 struct sysinit **sipp; /* system initialization*/ 169 struct sysinit **xipp; /* interior loop of sort*/ 170 struct sysinit *save; /* bubble*/ 171 172 restart: 173 /* 174 * Perform a bubble sort of the system initialization objects by 175 * their subsystem (primary key) and order (secondary key). 176 */ 177 for (sipp = sysinit; *sipp; sipp++) { 178 for (xipp = sipp + 1; *xipp; xipp++) { 179 if ((*sipp)->subsystem < (*xipp)->subsystem || 180 ((*sipp)->subsystem == (*xipp)->subsystem && 181 (*sipp)->order <= (*xipp)->order)) 182 continue; /* skip*/ 183 save = *sipp; 184 *sipp = *xipp; 185 *xipp = save; 186 } 187 } 188 189 /* 190 * Traverse the (now) ordered list of system initialization tasks. 191 * Perform each task, and continue on to the next task. 192 * 193 * The last item on the list is expected to be the scheduler, 194 * which will not return. 195 */ 196 for (sipp = sysinit; (sip = *sipp) != NULL; sipp++) { 197 if (sip->subsystem == SI_SUB_DUMMY) 198 continue; /* skip dummy task(s)*/ 199 200 if (sip->subsystem == SI_SUB_DONE) 201 continue; 202 203 /* Call function */ 204 (*(sip->func))(sip->udata); 205 206 /* Check off the one we're just done */ 207 sip->subsystem = SI_SUB_DONE; 208 209 /* Check if we've installed more sysinit items via KLD */ 210 if (newsysinit != NULL) { 211 if (sysinit != (struct sysinit **)sysinit_set.ls_items) 212 free(sysinit, M_TEMP); 213 sysinit = newsysinit; 214 newsysinit = NULL; 215 goto restart; 216 } 217 } 218 219 panic("Shouldn't get here!"); 220 /* NOTREACHED*/ 221 } 222 223 224 /* 225 *************************************************************************** 226 **** 227 **** The following SYSINIT's belong elsewhere, but have not yet 228 **** been moved. 229 **** 230 *************************************************************************** 231 */ 232 static void 233 print_caddr_t(void *data __unused) 234 { 235 printf("%s", (char *)data); 236 } 237 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright) 238 239 240 /* 241 *************************************************************************** 242 **** 243 **** The two following SYSINT's are proc0 specific glue code. I am not 244 **** convinced that they can not be safely combined, but their order of 245 **** operation has been maintained as the same as the original init_main.c 246 **** for right now. 247 **** 248 **** These probably belong in init_proc.c or kern_proc.c, since they 249 **** deal with proc0 (the fork template process). 250 **** 251 *************************************************************************** 252 */ 253 /* ARGSUSED*/ 254 static void 255 proc0_init(void *dummy __unused) 256 { 257 struct proc *p; 258 struct filedesc0 *fdp; 259 unsigned i; 260 261 p = &proc0; 262 263 /* 264 * Initialize process and pgrp structures. 265 */ 266 procinit(); 267 268 /* 269 * Initialize sleep queue hash table 270 */ 271 sleepinit(); 272 273 /* 274 * additional VM structures 275 */ 276 vm_init2(); 277 278 /* 279 * Create process 0 (the swapper). 280 */ 281 LIST_INSERT_HEAD(&allproc, p, p_list); 282 p->p_pgrp = &pgrp0; 283 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 284 LIST_INIT(&pgrp0.pg_members); 285 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 286 287 pgrp0.pg_session = &session0; 288 session0.s_count = 1; 289 session0.s_leader = p; 290 291 p->p_sysent = &aout_sysvec; 292 293 p->p_flag = P_INMEM | P_SYSTEM | P_CP_RELEASED; 294 p->p_stat = SRUN; 295 p->p_nice = NZERO; 296 p->p_rtprio.type = RTP_PRIO_NORMAL; 297 p->p_rtprio.prio = 0; 298 299 p->p_peers = 0; 300 p->p_leader = p; 301 302 bcopy("swapper", p->p_comm, sizeof ("swapper")); 303 304 /* Create credentials. */ 305 p->p_ucred = crget(); 306 p->p_ucred->cr_ruidinfo = uifind(0); 307 p->p_ucred->cr_ngroups = 1; /* group 0 */ 308 p->p_ucred->cr_uidinfo = uifind(0); 309 310 /* Don't jail it */ 311 p->p_ucred->cr_prison = NULL; 312 313 /* Create procsig. */ 314 p->p_procsig = &procsig0; 315 p->p_procsig->ps_refcnt = 1; 316 317 /* Initialize signal state for process 0. */ 318 siginit(&proc0); 319 320 /* Create the file descriptor table. */ 321 fdp = &filedesc0; 322 p->p_fd = &fdp->fd_fd; 323 p->p_fdtol = NULL; 324 fdp->fd_fd.fd_refcnt = 1; 325 fdp->fd_fd.fd_cmask = cmask; 326 fdp->fd_fd.fd_ofiles = fdp->fd_dfiles; 327 fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags; 328 fdp->fd_fd.fd_nfiles = NDFILE; 329 330 /* Create the limits structures. */ 331 p->p_limit = &limit0; 332 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 333 limit0.pl_rlimit[i].rlim_cur = 334 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 335 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = 336 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 337 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = 338 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 339 i = ptoa(vmstats.v_free_count); 340 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i; 341 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 342 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 343 limit0.p_cpulimit = RLIM_INFINITY; 344 limit0.p_refcnt = 1; 345 346 /* Allocate a prototype map so we have something to fork. */ 347 pmap_pinit0(vmspace_pmap(&vmspace0)); 348 p->p_vmspace = &vmspace0; 349 vmspace0.vm_refcnt = 1; 350 vm_map_init(&vmspace0.vm_map, round_page(VM_MIN_ADDRESS), 351 trunc_page(VM_MAXUSER_ADDRESS)); 352 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0); 353 354 /* 355 * We continue to place resource usage info and signal 356 * actions in the user struct so they're pageable. 357 */ 358 p->p_stats = &p->p_addr->u_stats; 359 p->p_sigacts = &p->p_addr->u_sigacts; 360 361 /* 362 * Charge root for one process. 363 */ 364 (void)chgproccnt(p->p_ucred->cr_uidinfo, 1, 0); 365 366 } 367 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL) 368 369 /* ARGSUSED*/ 370 static void 371 proc0_post(void *dummy __unused) 372 { 373 struct timespec ts; 374 struct proc *p; 375 376 /* 377 * Now we can look at the time, having had a chance to verify the 378 * time from the file system. Pretend that proc0 started now. 379 */ 380 FOREACH_PROC_IN_SYSTEM(p) { 381 microtime(&p->p_stats->p_start); 382 } 383 384 /* 385 * Give the ``random'' number generator a thump. 386 * XXX: Does read_random() contain enough bits to be used here ? 387 */ 388 nanotime(&ts); 389 srandom(ts.tv_sec ^ ts.tv_nsec); 390 } 391 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL) 392 393 /* 394 *************************************************************************** 395 **** 396 **** The following SYSINIT's and glue code should be moved to the 397 **** respective files on a per subsystem basis. 398 **** 399 *************************************************************************** 400 */ 401 402 403 /* 404 *************************************************************************** 405 **** 406 **** The following code probably belongs in another file, like 407 **** kern/init_init.c. 408 **** 409 *************************************************************************** 410 */ 411 412 /* 413 * List of paths to try when searching for "init". 414 */ 415 static char init_path[MAXPATHLEN] = 416 #ifdef INIT_PATH 417 __XSTRING(INIT_PATH); 418 #else 419 "/sbin/init:/sbin/oinit:/sbin/init.bak:/stand/sysinstall"; 420 #endif 421 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, ""); 422 423 /* 424 * Start the initial user process; try exec'ing each pathname in init_path. 425 * The program is invoked with one argument containing the boot flags. 426 * 427 * The MP lock is held on entry. 428 */ 429 static void 430 start_init(void *dummy) 431 { 432 vm_offset_t addr; 433 struct execve_args args; 434 int options, error; 435 char *var, *path, *next, *s; 436 char *ucp, **uap, *arg0, *arg1; 437 struct proc *p; 438 439 p = curproc; 440 441 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */ 442 if (VFS_ROOT(TAILQ_FIRST(&mountlist), &rootvnode)) 443 panic("cannot find root vnode"); 444 p->p_fd->fd_cdir = rootvnode; 445 VREF(p->p_fd->fd_cdir); 446 p->p_fd->fd_rdir = rootvnode; 447 VREF(p->p_fd->fd_rdir); 448 VOP_UNLOCK(rootvnode, 0, curthread); 449 450 /* 451 * Need just enough stack to hold the faked-up "execve()" arguments. 452 */ 453 addr = trunc_page(USRSTACK - PAGE_SIZE); 454 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 455 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 456 panic("init: couldn't allocate argument space"); 457 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 458 p->p_vmspace->vm_ssize = 1; 459 460 if ((var = getenv("init_path")) != NULL) { 461 strncpy(init_path, var, sizeof init_path); 462 init_path[sizeof init_path - 1] = 0; 463 } 464 if ((var = getenv("kern.fallback_elf_brand")) != NULL) 465 fallback_elf_brand = strtol(var, NULL, 0); 466 467 for (path = init_path; *path != '\0'; path = next) { 468 while (*path == ':') 469 path++; 470 if (*path == '\0') 471 break; 472 for (next = path; *next != '\0' && *next != ':'; next++) 473 /* nothing */ ; 474 if (bootverbose) 475 printf("start_init: trying %.*s\n", (int)(next - path), 476 path); 477 478 /* 479 * Move out the boot flag argument. 480 */ 481 options = 0; 482 ucp = (char *)USRSTACK; 483 (void)subyte(--ucp, 0); /* trailing zero */ 484 if (boothowto & RB_SINGLE) { 485 (void)subyte(--ucp, 's'); 486 options = 1; 487 } 488 #ifdef notyet 489 if (boothowto & RB_FASTBOOT) { 490 (void)subyte(--ucp, 'f'); 491 options = 1; 492 } 493 #endif 494 495 #ifdef BOOTCDROM 496 (void)subyte(--ucp, 'C'); 497 options = 1; 498 #endif 499 if (options == 0) 500 (void)subyte(--ucp, '-'); 501 (void)subyte(--ucp, '-'); /* leading hyphen */ 502 arg1 = ucp; 503 504 /* 505 * Move out the file name (also arg 0). 506 */ 507 (void)subyte(--ucp, 0); 508 for (s = next - 1; s >= path; s--) 509 (void)subyte(--ucp, *s); 510 arg0 = ucp; 511 512 /* 513 * Move out the arg pointers. 514 */ 515 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 516 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 517 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 518 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 519 520 /* 521 * Point at the arguments. 522 */ 523 args.fname = arg0; 524 args.argv = uap; 525 args.envv = NULL; 526 527 /* 528 * Now try to exec the program. If can't for any reason 529 * other than it doesn't exist, complain. 530 * 531 * Otherwise, return via fork_trampoline() all the way 532 * to user mode as init! 533 * 534 * WARNING! We may have been moved to another cpu after 535 * acquiring P_CURPROC. The MP lock will migrate with us 536 * though so we still have to release it. 537 */ 538 if ((error = execve(&args)) == 0) { 539 acquire_curproc(p); 540 rel_mplock(); 541 return; 542 } 543 if (error != ENOENT) 544 printf("exec %.*s: error %d\n", (int)(next - path), 545 path, error); 546 } 547 printf("init: not found in path %s\n", init_path); 548 panic("no init"); 549 } 550 551 /* 552 * Like kthread_create(), but runs in it's own address space. 553 * We do this early to reserve pid 1. 554 * 555 * Note special case - do not make it runnable yet. Other work 556 * in progress will change this more. 557 */ 558 static void 559 create_init(const void *udata __unused) 560 { 561 int error; 562 int s; 563 564 s = splhigh(); 565 error = fork1(&proc0, RFFDG | RFPROC, &initproc); 566 if (error) 567 panic("cannot fork init: %d\n", error); 568 initproc->p_flag |= P_INMEM | P_SYSTEM; 569 cpu_set_fork_handler(initproc, start_init, NULL); 570 splx(s); 571 } 572 SYSINIT(init,SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL) 573 574 /* 575 * Make it runnable now. 576 */ 577 static void 578 kick_init(const void *udata __unused) 579 { 580 start_forked_proc(&proc0, initproc); 581 } 582 SYSINIT(kickinit,SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL) 583 584 /* 585 * Machine independant globaldata initialization 586 * 587 * WARNING! Called from early boot, 'mycpu' may not work yet. 588 */ 589 void 590 mi_gdinit(struct globaldata *gd, int cpuid) 591 { 592 TAILQ_INIT(&gd->gd_tdfreeq); /* for pmap_{new,dispose}_thread() */ 593 gd->gd_cpuid = cpuid; 594 lwkt_gdinit(gd); 595 } 596 597 598