init_main.c revision 1.316
1 /* $NetBSD: init_main.c,v 1.316 2007/09/25 21:41:59 ad Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 37 */ 38 39 /* 40 * Copyright (c) 1995 Christopher G. Demetriou. All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 71 */ 72 73 #include <sys/cdefs.h> 74 __KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.316 2007/09/25 21:41:59 ad Exp $"); 75 76 #include "opt_ipsec.h" 77 #include "opt_multiprocessor.h" 78 #include "opt_ntp.h" 79 #include "opt_pipe.h" 80 #include "opt_posix.h" 81 #include "opt_syscall_debug.h" 82 #include "opt_sysv.h" 83 #include "opt_systrace.h" 84 #include "opt_fileassoc.h" 85 #include "opt_ktrace.h" 86 #include "opt_pax.h" 87 88 #include "rnd.h" 89 #include "sysmon_envsys.h" 90 #include "sysmon_power.h" 91 #include "sysmon_taskq.h" 92 #include "sysmon_wdog.h" 93 #include "veriexec.h" 94 95 #include <sys/param.h> 96 #include <sys/acct.h> 97 #include <sys/filedesc.h> 98 #include <sys/file.h> 99 #include <sys/errno.h> 100 #include <sys/callout.h> 101 #include <sys/cpu.h> 102 #include <sys/kernel.h> 103 #include <sys/kmem.h> 104 #include <sys/mount.h> 105 #include <sys/proc.h> 106 #include <sys/kthread.h> 107 #include <sys/resourcevar.h> 108 #include <sys/signalvar.h> 109 #include <sys/systm.h> 110 #include <sys/vnode.h> 111 #include <sys/fstrans.h> 112 #include <sys/tty.h> 113 #include <sys/conf.h> 114 #include <sys/disklabel.h> 115 #include <sys/buf.h> 116 #include <sys/device.h> 117 #include <sys/exec.h> 118 #include <sys/socketvar.h> 119 #include <sys/protosw.h> 120 #include <sys/reboot.h> 121 #include <sys/user.h> 122 #include <sys/sysctl.h> 123 #include <sys/event.h> 124 #include <sys/mbuf.h> 125 #include <sys/sched.h> 126 #include <sys/sleepq.h> 127 #include <sys/iostat.h> 128 #include <sys/vmem.h> 129 #include <sys/uuid.h> 130 #include <sys/extent.h> 131 #include <sys/disk.h> 132 #include <sys/mqueue.h> 133 #ifdef FAST_IPSEC 134 #include <netipsec/ipsec.h> 135 #endif 136 #ifdef SYSVSHM 137 #include <sys/shm.h> 138 #endif 139 #ifdef SYSVSEM 140 #include <sys/sem.h> 141 #endif 142 #ifdef SYSVMSG 143 #include <sys/msg.h> 144 #endif 145 #ifdef SYSTRACE 146 #include <sys/systrace.h> 147 #endif 148 #ifdef P1003_1B_SEMAPHORE 149 #include <sys/ksem.h> 150 #endif 151 #include <sys/domain.h> 152 #include <sys/namei.h> 153 #if NRND > 0 154 #include <sys/rnd.h> 155 #endif 156 #include <sys/pipe.h> 157 #ifdef LKM 158 #include <sys/lkm.h> 159 #endif 160 #if NVERIEXEC > 0 161 #include <sys/verified_exec.h> 162 #endif /* NVERIEXEC > 0 */ 163 #ifdef KTRACE 164 #include <sys/ktrace.h> 165 #endif 166 #include <sys/debug.h> 167 #include <sys/kauth.h> 168 #include <net80211/ieee80211_netbsd.h> 169 170 #include <sys/syscall.h> 171 #include <sys/syscallargs.h> 172 173 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 174 #include <sys/pax.h> 175 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 176 #include <ufs/ufs/quota.h> 177 178 #ifdef DDB 179 #include <machine/db_machdep.h> 180 #include <ddb/db_command.h> 181 #endif 182 183 #include <miscfs/genfs/genfs.h> 184 #include <miscfs/syncfs/syncfs.h> 185 186 #include <machine/cpu.h> 187 188 #include <uvm/uvm.h> 189 190 #if NSYSMON_TASKQ > 0 191 #include <dev/sysmon/sysmon_taskq.h> 192 #endif 193 194 #include <dev/cons.h> 195 196 #if NSYSMON_ENVSYS > 0 || NSYSMON_POWER > 0 || NSYSMON_WDOG > 0 197 #include <dev/sysmon/sysmonvar.h> 198 #endif 199 200 #include <net/if.h> 201 #include <net/raw_cb.h> 202 203 #include <secmodel/secmodel.h> 204 205 extern struct proc proc0; 206 extern struct lwp lwp0; 207 extern struct cwdinfo cwdi0; 208 extern time_t rootfstime; 209 210 #ifndef curlwp 211 struct lwp *curlwp = &lwp0; 212 #endif 213 struct proc *initproc; 214 215 struct vnode *rootvp, *swapdev_vp; 216 int boothowto; 217 int cold = 1; /* still working on startup */ 218 struct timeval boottime; /* time at system startup - will only follow settime deltas */ 219 int ncpu = 0; /* number of CPUs configured, assume 1 */ 220 221 volatile int start_init_exec; /* semaphore for start_init() */ 222 223 static void check_console(struct lwp *l); 224 static void start_init(void *); 225 void main(void); 226 227 #if defined(__SSP__) || defined(__SSP_ALL__) 228 long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0}; 229 void __stack_chk_fail(void); 230 231 void 232 __stack_chk_fail(void) 233 { 234 panic("stack overflow detected; terminated"); 235 } 236 #endif 237 238 void __secmodel_none(void); 239 __weak_alias(secmodel_start,__secmodel_none); 240 void 241 __secmodel_none(void) 242 { 243 return; 244 } 245 246 /* 247 * System startup; initialize the world, create process 0, mount root 248 * filesystem, and fork to create init and pagedaemon. Most of the 249 * hard work is done in the lower-level initialization routines including 250 * startup(), which does memory initialization and autoconfiguration. 251 */ 252 void 253 main(void) 254 { 255 #ifdef __HAVE_TIMECOUNTER 256 struct timeval time; 257 #endif 258 struct lwp *l; 259 struct proc *p; 260 struct pdevinit *pdev; 261 int s, error; 262 extern struct pdevinit pdevinit[]; 263 #ifdef NVNODE_IMPLICIT 264 int usevnodes; 265 #endif 266 CPU_INFO_ITERATOR cii; 267 struct cpu_info *ci; 268 269 l = &lwp0; 270 l->l_cpu = curcpu(); 271 l->l_proc = &proc0; 272 l->l_lid = 1; 273 274 /* XXX Remove before NetBSD 5.0 release */ 275 if (curlwp != l) { 276 printf("NOTICE: curlwp should be set before main()\n"); 277 DELAY(250000); 278 curlwp = l; 279 } 280 281 /* 282 * Attempt to find console and initialize 283 * in case of early panic or other messages. 284 */ 285 consinit(); 286 287 KERNEL_LOCK_INIT(); 288 289 uvm_init(); 290 291 #ifdef DEBUG 292 debug_init(); 293 #endif 294 295 kmem_init(); 296 297 /* Initialize the extent manager. */ 298 extent_init(); 299 300 /* Do machine-dependent initialization. */ 301 cpu_startup(); 302 303 /* Initialize callouts, part 1. */ 304 callout_startup(); 305 306 /* 307 * Initialize the kernel authorization subsystem and start the 308 * default security model, if any. We need to do this early 309 * enough so that subsystems relying on any of the aforementioned 310 * can work properly. Since the security model may dictate the 311 * credential inheritance policy, it is needed at least before 312 * any process is created, specifically proc0. 313 */ 314 kauth_init(); 315 secmodel_start(); 316 317 /* Initialize the buffer cache */ 318 bufinit(); 319 320 /* 321 * Initialize mbuf's. Do this now because we might attempt to 322 * allocate mbufs or mbuf clusters during autoconfiguration. 323 */ 324 mbinit(); 325 326 /* Initialize sockets. */ 327 soinit(); 328 329 /* 330 * The following things must be done before autoconfiguration. 331 */ 332 evcnt_init(); /* initialize event counters */ 333 #if NRND > 0 334 rnd_init(); /* initialize RNG */ 335 #endif 336 337 /* Initialize process and pgrp structures. */ 338 procinit(); 339 lwpinit(); 340 341 /* Initialize signal-related data structures. */ 342 signal_init(); 343 344 /* Create process 0 (the swapper). */ 345 proc0_init(); 346 347 /* Initialize the UID hash table. */ 348 uid_init(); 349 350 /* Charge root for one process. */ 351 (void)chgproccnt(0, 1); 352 353 /* Initialize the run queues, turnstiles and sleep queues. */ 354 mutex_init(&cpu_lock, MUTEX_DEFAULT, IPL_NONE); 355 sched_rqinit(); 356 turnstile_init(); 357 sleeptab_init(&sleeptab); 358 359 /* MI initialization of the boot cpu */ 360 error = mi_cpu_attach(curcpu()); 361 KASSERT(error == 0); 362 363 /* Initialize the sysctl subsystem. */ 364 sysctl_init(); 365 366 /* Initialize I/O statistics. */ 367 iostat_init(); 368 369 /* Initialize the file systems. */ 370 #ifdef NVNODE_IMPLICIT 371 /* 372 * If maximum number of vnodes in namei vnode cache is not explicitly 373 * defined in kernel config, adjust the number such as we use roughly 374 * 1.0% of memory for vnode cache (but not less than NVNODE vnodes). 375 */ 376 usevnodes = (ptoa((unsigned)physmem) / 100) / sizeof(struct vnode); 377 if (usevnodes > desiredvnodes) 378 desiredvnodes = usevnodes; 379 #endif 380 vfsinit(); 381 382 /* Initialize fstrans. */ 383 fstrans_init(); 384 385 /* Initialize the select()/poll() system calls. */ 386 selsysinit(); 387 388 /* Initialize asynchronous I/O. */ 389 aio_sysinit(); 390 391 /* Initialize message queues. */ 392 mqueue_sysinit(); 393 394 /* Initialize the system monitor subsystems. */ 395 #if NSYSMON_TASKQ > 0 396 sysmon_task_queue_preinit(); 397 #endif 398 399 #if NSYSMON_ENVSYS > 0 400 sysmon_envsys_init(); 401 #endif 402 403 #if NSYSMON_POWER > 0 404 sysmon_power_init(); 405 #endif 406 407 #if NSYSMON_WDOG > 0 408 sysmon_wdog_init(); 409 #endif 410 411 #ifdef __HAVE_TIMECOUNTER 412 inittimecounter(); 413 ntp_init(); 414 #endif /* __HAVE_TIMECOUNTER */ 415 416 #ifdef DDB 417 db_init_commands(); 418 #endif 419 420 /* Initialize the device switch tables. */ 421 devsw_init(); 422 423 /* Initialize the disk wedge subsystem. */ 424 dkwedge_init(); 425 426 /* Configure the system hardware. This will enable interrupts. */ 427 configure(); 428 429 #if defined(__SSP__) || defined(__SSP_ALL__) 430 { 431 #ifdef DIAGNOSTIC 432 printf("Initializing SSP:"); 433 #endif 434 /* 435 * We initialize ssp here carefully: 436 * 1. after we got some entropy 437 * 2. without calling a function 438 */ 439 size_t i; 440 long guard[__arraycount(__stack_chk_guard)]; 441 442 arc4randbytes(guard, sizeof(guard)); 443 for (i = 0; i < __arraycount(guard); i++) 444 __stack_chk_guard[i] = guard[i]; 445 #ifdef DIAGNOSTIC 446 for (i = 0; i < __arraycount(guard); i++) 447 printf("%lx ", guard[i]); 448 printf("\n"); 449 #endif 450 } 451 #endif 452 ubc_init(); /* must be after autoconfig */ 453 454 /* Lock the kernel on behalf of proc0. */ 455 KERNEL_LOCK(1, l); 456 457 #ifdef SYSTRACE 458 systrace_init(); 459 #endif 460 461 #ifdef SYSVSHM 462 /* Initialize System V style shared memory. */ 463 shminit(); 464 #endif 465 466 #ifdef SYSVSEM 467 /* Initialize System V style semaphores. */ 468 seminit(); 469 #endif 470 471 #ifdef SYSVMSG 472 /* Initialize System V style message queues. */ 473 msginit(); 474 #endif 475 476 #ifdef P1003_1B_SEMAPHORE 477 /* Initialize posix semaphores */ 478 ksem_init(); 479 #endif 480 481 #if NVERIEXEC > 0 482 /* 483 * Initialise the Veriexec subsystem. 484 */ 485 veriexec_init(); 486 #endif /* NVERIEXEC > 0 */ 487 488 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 489 pax_init(); 490 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 491 492 /* Attach pseudo-devices. */ 493 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 494 (*pdev->pdev_attach)(pdev->pdev_count); 495 496 #ifdef FAST_IPSEC 497 /* Attach network crypto subsystem */ 498 ipsec_attach(); 499 #endif 500 501 /* 502 * Initialize protocols. Block reception of incoming packets 503 * until everything is ready. 504 */ 505 s = splnet(); 506 ifinit(); 507 domaininit(); 508 if_attachdomain(); 509 splx(s); 510 511 #ifdef GPROF 512 /* Initialize kernel profiling. */ 513 kmstartup(); 514 #endif 515 516 /* Initialize system accouting. */ 517 acct_init(); 518 519 #ifndef PIPE_SOCKETPAIR 520 /* Initialize pipes. */ 521 pipe_init(); 522 #endif 523 524 /* Setup the scheduler */ 525 sched_init(); 526 527 #ifdef KTRACE 528 /* Initialize ktrace. */ 529 ktrinit(); 530 #endif 531 532 /* Initialize the UUID system calls. */ 533 uuid_init(); 534 535 /* 536 * Create process 1 (init(8)). We do this now, as Unix has 537 * historically had init be process 1, and changing this would 538 * probably upset a lot of people. 539 * 540 * Note that process 1 won't immediately exec init(8), but will 541 * wait for us to inform it that the root file system has been 542 * mounted. 543 */ 544 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 545 panic("fork init"); 546 547 /* 548 * Now that device driver threads have been created, wait for 549 * them to finish any deferred autoconfiguration. Note we don't 550 * need to lock this semaphore, since we haven't booted any 551 * secondary processors, yet. 552 */ 553 while (config_pending) 554 (void) tsleep(&config_pending, PWAIT, "cfpend", 0); 555 556 /* 557 * Finalize configuration now that all real devices have been 558 * found. This needs to be done before the root device is 559 * selected, since finalization may create the root device. 560 */ 561 config_finalize(); 562 563 /* 564 * Now that autoconfiguration has completed, we can determine 565 * the root and dump devices. 566 */ 567 cpu_rootconf(); 568 cpu_dumpconf(); 569 570 /* Mount the root file system. */ 571 do { 572 domountroothook(); 573 if ((error = vfs_mountroot())) { 574 printf("cannot mount root, error = %d\n", error); 575 boothowto |= RB_ASKNAME; 576 setroot(root_device, 577 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 578 } 579 } while (error != 0); 580 mountroothook_destroy(); 581 582 /* 583 * Initialise the time-of-day clock, passing the time recorded 584 * in the root filesystem (if any) for use by systems that 585 * don't have a non-volatile time-of-day device. 586 */ 587 inittodr(rootfstime); 588 589 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 590 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 591 592 /* 593 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 594 * reference it. 595 */ 596 error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode); 597 if (error) 598 panic("cannot find root vnode, error=%d", error); 599 cwdi0.cwdi_cdir = rootvnode; 600 VREF(cwdi0.cwdi_cdir); 601 VOP_UNLOCK(rootvnode, 0); 602 cwdi0.cwdi_rdir = NULL; 603 604 /* 605 * Now that root is mounted, we can fixup initproc's CWD 606 * info. All other processes are kthreads, which merely 607 * share proc0's CWD info. 608 */ 609 initproc->p_cwdi->cwdi_cdir = rootvnode; 610 VREF(initproc->p_cwdi->cwdi_cdir); 611 initproc->p_cwdi->cwdi_rdir = NULL; 612 613 /* 614 * Now can look at time, having had a chance to verify the time 615 * from the file system. Reset l->l_rtime as it may have been 616 * munched in mi_switch() after the time got set. 617 */ 618 #ifdef __HAVE_TIMECOUNTER 619 getmicrotime(&time); 620 #else 621 mono_time = time; 622 #endif 623 boottime = time; 624 mutex_enter(&proclist_lock); 625 LIST_FOREACH(p, &allproc, p_list) { 626 KASSERT((p->p_flag & PK_MARKER) == 0); 627 mutex_enter(&p->p_smutex); 628 p->p_stats->p_start = time; 629 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 630 lwp_lock(l); 631 l->l_cpu->ci_schedstate.spc_runtime = time; 632 l->l_rtime.tv_sec = l->l_rtime.tv_usec = 0; 633 lwp_unlock(l); 634 } 635 mutex_exit(&p->p_smutex); 636 } 637 mutex_exit(&proclist_lock); 638 639 for (CPU_INFO_FOREACH(cii, ci)) { 640 ci->ci_schedstate.spc_lastmod = time_second; 641 } 642 643 /* Create the pageout daemon kernel thread. */ 644 uvm_swap_init(); 645 if (kthread_create(PVM, 0, NULL, uvm_pageout, 646 NULL, NULL, "pgdaemon")) 647 panic("fork pagedaemon"); 648 649 /* Create the filesystem syncer kernel thread. */ 650 if (kthread_create(PINOD, 0, NULL, sched_sync, NULL, NULL, "ioflush")) 651 panic("fork syncer"); 652 653 /* Create the aiodone daemon kernel thread. */ 654 if (workqueue_create(&uvm.aiodone_queue, "aiodoned", 655 uvm_aiodone_worker, NULL, PVM, IPL_BIO, 0)) 656 panic("fork aiodoned"); 657 658 vmem_rehash_start(); 659 660 #if defined(MULTIPROCESSOR) 661 /* Boot the secondary processors. */ 662 cpu_boot_secondary_processors(); 663 #endif 664 665 /* Initialize exec structures */ 666 exec_init(1); 667 668 /* 669 * Okay, now we can let init(8) exec! It's off to userland! 670 */ 671 start_init_exec = 1; 672 wakeup(&start_init_exec); 673 674 /* The scheduler is an infinite loop. */ 675 uvm_scheduler(); 676 /* NOTREACHED */ 677 } 678 679 static void 680 check_console(struct lwp *l) 681 { 682 struct nameidata nd; 683 int error; 684 685 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", l); 686 error = namei(&nd); 687 if (error == 0) 688 vrele(nd.ni_vp); 689 else if (error == ENOENT) 690 printf("warning: no /dev/console\n"); 691 else 692 printf("warning: lookup /dev/console: error %d\n", error); 693 } 694 695 /* 696 * List of paths to try when searching for "init". 697 */ 698 static const char *initpaths[] = { 699 "/sbin/init", 700 "/sbin/oinit", 701 "/sbin/init.bak", 702 NULL, 703 }; 704 705 /* 706 * Start the initial user process; try exec'ing each pathname in "initpaths". 707 * The program is invoked with one argument containing the boot flags. 708 */ 709 static void 710 start_init(void *arg) 711 { 712 struct lwp *l = arg; 713 struct proc *p = l->l_proc; 714 vaddr_t addr; 715 struct sys_execve_args /* { 716 syscallarg(const char *) path; 717 syscallarg(char * const *) argp; 718 syscallarg(char * const *) envp; 719 } */ args; 720 int options, i, error; 721 register_t retval[2]; 722 char flags[4], *flagsp; 723 const char *path, *slash; 724 char *ucp, **uap, *arg0, *arg1 = NULL; 725 char ipath[129]; 726 int ipx, len; 727 728 /* 729 * Now in process 1. 730 */ 731 strncpy(p->p_comm, "init", MAXCOMLEN); 732 733 /* 734 * Wait for main() to tell us that it's safe to exec. 735 */ 736 while (start_init_exec == 0) 737 (void) tsleep(&start_init_exec, PWAIT, "initexec", 0); 738 739 /* 740 * This is not the right way to do this. We really should 741 * hand-craft a descriptor onto /dev/console to hand to init, 742 * but that's a _lot_ more work, and the benefit from this easy 743 * hack makes up for the "good is the enemy of the best" effect. 744 */ 745 check_console(l); 746 747 /* 748 * Need just enough stack to hold the faked-up "execve()" arguments. 749 */ 750 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 751 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 752 NULL, UVM_UNKNOWN_OFFSET, 0, 753 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 754 UVM_ADV_NORMAL, 755 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 756 panic("init: couldn't allocate argument space"); 757 p->p_vmspace->vm_maxsaddr = (void *)STACK_MAX(addr, PAGE_SIZE); 758 759 ipx = 0; 760 while (1) { 761 if (boothowto & RB_ASKNAME) { 762 printf("init path"); 763 if (initpaths[ipx]) 764 printf(" (default %s)", initpaths[ipx]); 765 printf(": "); 766 len = cngetsn(ipath, sizeof(ipath)-1); 767 if (len == 0) { 768 if (initpaths[ipx]) 769 path = initpaths[ipx++]; 770 else 771 continue; 772 } else { 773 ipath[len] = '\0'; 774 path = ipath; 775 } 776 } else { 777 if ((path = initpaths[ipx++]) == NULL) 778 break; 779 } 780 781 ucp = (char *)USRSTACK; 782 783 /* 784 * Construct the boot flag argument. 785 */ 786 flagsp = flags; 787 *flagsp++ = '-'; 788 options = 0; 789 790 if (boothowto & RB_SINGLE) { 791 *flagsp++ = 's'; 792 options = 1; 793 } 794 #ifdef notyet 795 if (boothowto & RB_FASTBOOT) { 796 *flagsp++ = 'f'; 797 options = 1; 798 } 799 #endif 800 801 /* 802 * Move out the flags (arg 1), if necessary. 803 */ 804 if (options != 0) { 805 *flagsp++ = '\0'; 806 i = flagsp - flags; 807 #ifdef DEBUG 808 printf("init: copying out flags `%s' %d\n", flags, i); 809 #endif 810 arg1 = STACK_ALLOC(ucp, i); 811 ucp = STACK_MAX(arg1, i); 812 (void)copyout((void *)flags, arg1, i); 813 } 814 815 /* 816 * Move out the file name (also arg 0). 817 */ 818 i = strlen(path) + 1; 819 #ifdef DEBUG 820 printf("init: copying out path `%s' %d\n", path, i); 821 #else 822 if (boothowto & RB_ASKNAME || path != initpaths[0]) 823 printf("init: trying %s\n", path); 824 #endif 825 arg0 = STACK_ALLOC(ucp, i); 826 ucp = STACK_MAX(arg0, i); 827 (void)copyout(path, arg0, i); 828 829 /* 830 * Move out the arg pointers. 831 */ 832 ucp = (void *)STACK_ALIGN(ucp, ALIGNBYTES); 833 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 834 SCARG(&args, path) = arg0; 835 SCARG(&args, argp) = uap; 836 SCARG(&args, envp) = NULL; 837 slash = strrchr(path, '/'); 838 if (slash) 839 (void)suword((void *)uap++, 840 (long)arg0 + (slash + 1 - path)); 841 else 842 (void)suword((void *)uap++, (long)arg0); 843 if (options != 0) 844 (void)suword((void *)uap++, (long)arg1); 845 (void)suword((void *)uap++, 0); /* terminator */ 846 847 /* 848 * Now try to exec the program. If can't for any reason 849 * other than it doesn't exist, complain. 850 */ 851 error = sys_execve(l, &args, retval); 852 if (error == 0 || error == EJUSTRETURN) { 853 KERNEL_UNLOCK_LAST(l); 854 return; 855 } 856 printf("exec %s: error %d\n", path, error); 857 } 858 printf("init: not found\n"); 859 panic("no init"); 860 } 861
Indexes created Mon Sep 22 21:09:42 GMT 2025