sys/kern/init_main.c

   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  */
  43
  44 #include <sys/cdefs.h>
  45 __FBSDID("$FreeBSD$");
  46
  47 #include "opt_ddb.h"
  48 #include "opt_init_path.h"
  49 #include "opt_verbose_sysinit.h"
  50
  51 #include <sys/param.h>
  52 #include <sys/kernel.h>
  53 #include <sys/exec.h>
  54 #include <sys/file.h>
  55 #include <sys/filedesc.h>
  56 #include <sys/jail.h>
  57 #include <sys/ktr.h>
  58 #include <sys/lock.h>
  59 #include <sys/loginclass.h>
  60 #include <sys/mount.h>
  61 #include <sys/mutex.h>
  62 #include <sys/syscallsubr.h>
  63 #include <sys/sysctl.h>
  64 #include <sys/proc.h>
  65 #include <sys/racct.h>
  66 #include <sys/resourcevar.h>
  67 #include <sys/systm.h>
  68 #include <sys/signalvar.h>
  69 #include <sys/vnode.h>
  70 #include <sys/sysent.h>
  71 #include <sys/reboot.h>
  72 #include <sys/sched.h>
  73 #include <sys/sx.h>
  74 #include <sys/sysproto.h>
  75 #include <sys/vmmeter.h>
  76 #include <sys/unistd.h>
  77 #include <sys/malloc.h>
  78 #include <sys/conf.h>
  79 #include <sys/cpuset.h>
  80
  81 #include <machine/cpu.h>
  82
  83 #include <security/audit/audit.h>
  84 #include <security/mac/mac_framework.h>
  85
  86 #include <vm/vm.h>
  87 #include <vm/vm_param.h>
  88 #include <vm/pmap.h>
  89 #include <vm/vm_map.h>
  90 #include <vm/vm_domain.h>
  91 #include <sys/copyright.h>
  92
  93 #include <ddb/ddb.h>
  94 #include <ddb/db_sym.h>
  95
  96 void mi_startup(void);                          /* Should be elsewhere */
  97
  98 /* Components of the first process -- never freed. */
  99 static struct session session0;
 100 static struct pgrp pgrp0;
 101 struct  proc proc0;
 102 struct  thread thread0 __aligned(16);
 103 struct  vmspace vmspace0;
 104 struct  proc *initproc;
 105
 106 #ifndef BOOTHOWTO
 107 #define BOOTHOWTO       0
 108 #endif
 109 int     boothowto = BOOTHOWTO;  /* initialized so that it can be patched */
 110 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
 111         "Boot control flags, passed from loader");
 112
 113 #ifndef BOOTVERBOSE
 114 #define BOOTVERBOSE     0
 115 #endif
 116 int     bootverbose = BOOTVERBOSE;
 117 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
 118         "Control the output of verbose kernel messages");
 119
 120 #ifdef INVARIANTS
 121 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance");
 122 #endif
 123
 124 /*
 125  * This ensures that there is at least one entry so that the sysinit_set
 126  * symbol is not undefined.  A sybsystem ID of SI_SUB_DUMMY is never
 127  * executed.
 128  */
 129 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
 130
 131 /*
 132  * The sysinit table itself.  Items are checked off as the are run.
 133  * If we want to register new sysinit types, add them to newsysinit.
 134  */
 135 SET_DECLARE(sysinit_set, struct sysinit);
 136 struct sysinit **sysinit, **sysinit_end;
 137 struct sysinit **newsysinit, **newsysinit_end;
 138
 139 /*
 140  * Merge a new sysinit set into the current set, reallocating it if
 141  * necessary.  This can only be called after malloc is running.
 142  */
 143 void
 144 sysinit_add(struct sysinit **set, struct sysinit **set_end)
 145 {
 146         struct sysinit **newset;
 147         struct sysinit **sipp;
 148         struct sysinit **xipp;
 149         int count;
 150
 151         count = set_end - set;
 152         if (newsysinit)
 153                 count += newsysinit_end - newsysinit;
 154         else
 155                 count += sysinit_end - sysinit;
 156         newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
 157         if (newset == NULL)
 158                 panic("cannot malloc for sysinit");
 159         xipp = newset;
 160         if (newsysinit)
 161                 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
 162                         *xipp++ = *sipp;
 163         else
 164                 for (sipp = sysinit; sipp < sysinit_end; sipp++)
 165                         *xipp++ = *sipp;
 166         for (sipp = set; sipp < set_end; sipp++)
 167                 *xipp++ = *sipp;
 168         if (newsysinit)
 169                 free(newsysinit, M_TEMP);
 170         newsysinit = newset;
 171         newsysinit_end = newset + count;
 172 }
 173
 174 #if defined (DDB) && defined(VERBOSE_SYSINIT)
 175 static const char *
 176 symbol_name(vm_offset_t va, db_strategy_t strategy)
 177 {
 178         const char *name;
 179         c_db_sym_t sym;
 180         db_expr_t  offset;
 181
 182         if (va == 0)
 183                 return (NULL);
 184         sym = db_search_symbol(va, strategy, &offset);
 185         if (offset != 0)
 186                 return (NULL);
 187         db_symbol_values(sym, &name, NULL);
 188         return (name);
 189 }
 190 #endif
 191
 192 /*
 193  * System startup; initialize the world, create process 0, mount root
 194  * filesystem, and fork to create init and pagedaemon.  Most of the
 195  * hard work is done in the lower-level initialization routines including
 196  * startup(), which does memory initialization and autoconfiguration.
 197  *
 198  * This allows simple addition of new kernel subsystems that require
 199  * boot time initialization.  It also allows substitution of subsystem
 200  * (for instance, a scheduler, kernel profiler, or VM system) by object
 201  * module.  Finally, it allows for optional "kernel threads".
 202  */
 203 void
 204 mi_startup(void)
 205 {
 206
 207         register struct sysinit **sipp;         /* system initialization*/
 208         register struct sysinit **xipp;         /* interior loop of sort*/
 209         register struct sysinit *save;          /* bubble*/
 210
 211 #if defined(VERBOSE_SYSINIT)
 212         int last;
 213         int verbose;
 214 #endif
 215
 216         if (boothowto & RB_VERBOSE)
 217                 bootverbose++;
 218
 219         if (sysinit == NULL) {
 220                 sysinit = SET_BEGIN(sysinit_set);
 221                 sysinit_end = SET_LIMIT(sysinit_set);
 222         }
 223
 224 restart:
 225         /*
 226          * Perform a bubble sort of the system initialization objects by
 227          * their subsystem (primary key) and order (secondary key).
 228          */
 229         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
 230                 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
 231                         if ((*sipp)->subsystem < (*xipp)->subsystem ||
 232                              ((*sipp)->subsystem == (*xipp)->subsystem &&
 233                               (*sipp)->order <= (*xipp)->order))
 234                                 continue;       /* skip*/
 235                         save = *sipp;
 236                         *sipp = *xipp;
 237                         *xipp = save;
 238                 }
 239         }
 240
 241 #if defined(VERBOSE_SYSINIT)
 242         last = SI_SUB_COPYRIGHT;
 243         verbose = 0;
 244 #if !defined(DDB)
 245         printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
 246 #endif
 247 #endif
 248
 249         /*
 250          * Traverse the (now) ordered list of system initialization tasks.
 251          * Perform each task, and continue on to the next task.
 252          */
 253         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
 254
 255                 if ((*sipp)->subsystem == SI_SUB_DUMMY)
 256                         continue;       /* skip dummy task(s)*/
 257
 258                 if ((*sipp)->subsystem == SI_SUB_DONE)
 259                         continue;
 260
 261 #if defined(VERBOSE_SYSINIT)
 262                 if ((*sipp)->subsystem > last) {
 263                         verbose = 1;
 264                         last = (*sipp)->subsystem;
 265                         printf("subsystem %x\n", last);
 266                 }
 267                 if (verbose) {
 268 #if defined(DDB)
 269                         const char *func, *data;
 270
 271                         func = symbol_name((vm_offset_t)(*sipp)->func,
 272                             DB_STGY_PROC);
 273                         data = symbol_name((vm_offset_t)(*sipp)->udata,
 274                             DB_STGY_ANY);
 275                         if (func != NULL && data != NULL)
 276                                 printf("   %s(&%s)... ", func, data);
 277                         else if (func != NULL)
 278                                 printf("   %s(%p)... ", func, (*sipp)->udata);
 279                         else
 280 #endif
 281                                 printf("   %p(%p)... ", (*sipp)->func,
 282                                     (*sipp)->udata);
 283                 }
 284 #endif
 285
 286                 /* Call function */
 287                 (*((*sipp)->func))((*sipp)->udata);
 288
 289 #if defined(VERBOSE_SYSINIT)
 290                 if (verbose)
 291                         printf("done.\n");
 292 #endif
 293
 294                 /* Check off the one we're just done */
 295                 (*sipp)->subsystem = SI_SUB_DONE;
 296
 297                 /* Check if we've installed more sysinit items via KLD */
 298                 if (newsysinit != NULL) {
 299                         if (sysinit != SET_BEGIN(sysinit_set))
 300                                 free(sysinit, M_TEMP);
 301                         sysinit = newsysinit;
 302                         sysinit_end = newsysinit_end;
 303                         newsysinit = NULL;
 304                         newsysinit_end = NULL;
 305                         goto restart;
 306                 }
 307         }
 308
 309         mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
 310         mtx_unlock(&Giant);
 311
 312         /*
 313          * Now hand over this thread to swapper.
 314          */
 315         swapper();
 316         /* NOTREACHED*/
 317 }
 318
 319
 320 /*
 321  ***************************************************************************
 322  ****
 323  **** The following SYSINIT's belong elsewhere, but have not yet
 324  **** been moved.
 325  ****
 326  ***************************************************************************
 327  */
 328 static void
 329 print_caddr_t(void *data)
 330 {
 331         printf("%s", (char *)data);
 332 }
 333
 334 static void
 335 print_version(void *data __unused)
 336 {
 337         int len;
 338
 339         /* Strip a trailing newline from version. */
 340         len = strlen(version);
 341         while (len > 0 && version[len - 1] == '\n')
 342                 len--;
 343         printf("%.*s %s\n", len, version, machine);
 344         printf("%s\n", compiler_version);
 345 }
 346
 347 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
 348     copyright);
 349 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
 350     trademark);
 351 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
 352
 353 #ifdef WITNESS
 354 static char wit_warn[] =
 355      "WARNING: WITNESS option enabled, expect reduced performance.\n";
 356 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
 357    print_caddr_t, wit_warn);
 358 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1,
 359    print_caddr_t, wit_warn);
 360 #endif
 361
 362 #ifdef DIAGNOSTIC
 363 static char diag_warn[] =
 364      "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
 365 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
 366     print_caddr_t, diag_warn);
 367 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2,
 368     print_caddr_t, diag_warn);
 369 #endif
 370
 371 static int
 372 null_fetch_syscall_args(struct thread *td __unused,
 373     struct syscall_args *sa __unused)
 374 {
 375
 376         panic("null_fetch_syscall_args");
 377 }
 378
 379 static void
 380 null_set_syscall_retval(struct thread *td __unused, int error __unused)
 381 {
 382
 383         panic("null_set_syscall_retval");
 384 }
 385
 386 struct sysentvec null_sysvec = {
 387         .sv_size        = 0,
 388         .sv_table       = NULL,
 389         .sv_mask        = 0,
 390         .sv_errsize     = 0,
 391         .sv_errtbl      = NULL,
 392         .sv_transtrap   = NULL,
 393         .sv_fixup       = NULL,
 394         .sv_sendsig     = NULL,
 395         .sv_sigcode     = NULL,
 396         .sv_szsigcode   = NULL,
 397         .sv_name        = "null",
 398         .sv_coredump    = NULL,
 399         .sv_imgact_try  = NULL,
 400         .sv_minsigstksz = 0,
 401         .sv_pagesize    = PAGE_SIZE,
 402         .sv_minuser     = VM_MIN_ADDRESS,
 403         .sv_maxuser     = VM_MAXUSER_ADDRESS,
 404         .sv_usrstack    = USRSTACK,
 405         .sv_psstrings   = PS_STRINGS,
 406         .sv_stackprot   = VM_PROT_ALL,
 407         .sv_copyout_strings     = NULL,
 408         .sv_setregs     = NULL,
 409         .sv_fixlimit    = NULL,
 410         .sv_maxssiz     = NULL,
 411         .sv_flags       = 0,
 412         .sv_set_syscall_retval = null_set_syscall_retval,
 413         .sv_fetch_syscall_args = null_fetch_syscall_args,
 414         .sv_syscallnames = NULL,
 415         .sv_schedtail   = NULL,
 416         .sv_thread_detach = NULL,
 417         .sv_trap        = NULL,
 418 };
 419
 420 /*
 421  ***************************************************************************
 422  ****
 423  **** The two following SYSINIT's are proc0 specific glue code.  I am not
 424  **** convinced that they can not be safely combined, but their order of
 425  **** operation has been maintained as the same as the original init_main.c
 426  **** for right now.
 427  ****
 428  **** These probably belong in init_proc.c or kern_proc.c, since they
 429  **** deal with proc0 (the fork template process).
 430  ****
 431  ***************************************************************************
 432  */
 433 /* ARGSUSED*/
 434 static void
 435 proc0_init(void *dummy __unused)
 436 {
 437         struct proc *p;
 438         struct thread *td;
 439         struct ucred *newcred;
 440         vm_paddr_t pageablemem;
 441         int i;
 442
 443         GIANT_REQUIRED;
 444         p = &proc0;
 445         td = &thread0;
 446
 447         /*
 448          * Initialize magic number and osrel.
 449          */
 450         p->p_magic = P_MAGIC;
 451         p->p_osrel = osreldate;
 452
 453         /*
 454          * Initialize thread and process structures.
 455          */
 456         procinit();     /* set up proc zone */
 457         threadinit();   /* set up UMA zones */
 458
 459         /*
 460          * Initialise scheduler resources.
 461          * Add scheduler specific parts to proc, thread as needed.
 462          */
 463         schedinit();    /* scheduler gets its house in order */
 464
 465         /*
 466          * Create process 0 (the swapper).
 467          */
 468         LIST_INSERT_HEAD(&allproc, p, p_list);
 469         LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
 470         mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
 471         p->p_pgrp = &pgrp0;
 472         LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
 473         LIST_INIT(&pgrp0.pg_members);
 474         LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
 475
 476         pgrp0.pg_session = &session0;
 477         mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
 478         refcount_init(&session0.s_count, 1);
 479         session0.s_leader = p;
 480
 481         p->p_sysent = &null_sysvec;
 482         p->p_flag = P_SYSTEM | P_INMEM;
 483         p->p_flag2 = 0;
 484         p->p_state = PRS_NORMAL;
 485         knlist_init_mtx(&p->p_klist, &p->p_mtx);
 486         STAILQ_INIT(&p->p_ktr);
 487         p->p_nice = NZERO;
 488         /* pid_max cannot be greater than PID_MAX */
 489         td->td_tid = PID_MAX + 1;
 490         LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash);
 491         td->td_state = TDS_RUNNING;
 492         td->td_pri_class = PRI_TIMESHARE;
 493         td->td_user_pri = PUSER;
 494         td->td_base_user_pri = PUSER;
 495         td->td_lend_user_pri = PRI_MAX;
 496         td->td_priority = PVM;
 497         td->td_base_pri = PVM;
 498         td->td_oncpu = 0;
 499         td->td_flags = TDF_INMEM;
 500         td->td_pflags = TDP_KTHREAD;
 501         td->td_cpuset = cpuset_thread0();
 502         vm_domain_policy_init(&td->td_vm_dom_policy);
 503         vm_domain_policy_set(&td->td_vm_dom_policy, VM_POLICY_NONE, -1);
 504         vm_domain_policy_init(&p->p_vm_dom_policy);
 505         vm_domain_policy_set(&p->p_vm_dom_policy, VM_POLICY_NONE, -1);
 506         prison0_init();
 507         p->p_peers = 0;
 508         p->p_leader = p;
 509         p->p_reaper = p;
 510         LIST_INIT(&p->p_reaplist);
 511
 512         strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
 513         strncpy(td->td_name, "swapper", sizeof (td->td_name));
 514
 515         callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
 516         callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
 517         callout_init(&td->td_slpcallout, 1);
 518
 519         /* Create credentials. */
 520         newcred = crget();
 521         newcred->cr_ngroups = 1;        /* group 0 */
 522         newcred->cr_uidinfo = uifind(0);
 523         newcred->cr_ruidinfo = uifind(0);
 524         newcred->cr_prison = &prison0;
 525         newcred->cr_loginclass = loginclass_find("default");
 526         proc_set_cred_init(p, newcred);
 527 #ifdef AUDIT
 528         audit_cred_kproc0(newcred);
 529 #endif
 530 #ifdef MAC
 531         mac_cred_create_swapper(newcred);
 532 #endif
 533         /* Create sigacts. */
 534         p->p_sigacts = sigacts_alloc();
 535
 536         /* Initialize signal state for process 0. */
 537         siginit(&proc0);
 538
 539         /* Create the file descriptor table. */
 540         p->p_fd = fdinit(NULL, false);
 541         p->p_fdtol = NULL;
 542
 543         /* Create the limits structures. */
 544         p->p_limit = lim_alloc();
 545         for (i = 0; i < RLIM_NLIMITS; i++)
 546                 p->p_limit->pl_rlimit[i].rlim_cur =
 547                     p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
 548         p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
 549             p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
 550         p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
 551             p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
 552         p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
 553         p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
 554         p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
 555         p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
 556         /* Cast to avoid overflow on i386/PAE. */
 557         pageablemem = ptoa((vm_paddr_t)vm_cnt.v_free_count);
 558         p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
 559             p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
 560         p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
 561         p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
 562         p->p_cpulimit = RLIM_INFINITY;
 563
 564         PROC_LOCK(p);
 565         thread_cow_get_proc(td, p);
 566         PROC_UNLOCK(p);
 567
 568         /* Initialize resource accounting structures. */
 569         racct_create(&p->p_racct);
 570
 571         p->p_stats = pstats_alloc();
 572
 573         /* Allocate a prototype map so we have something to fork. */
 574         p->p_vmspace = &vmspace0;
 575         vmspace0.vm_refcnt = 1;
 576         pmap_pinit0(vmspace_pmap(&vmspace0));
 577
 578         /*
 579          * proc0 is not expected to enter usermode, so there is no special
 580          * handling for sv_minuser here, like is done for exec_new_vmspace().
 581          */
 582         vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
 583             p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
 584
 585         /*
 586          * Call the init and ctor for the new thread and proc.  We wait
 587          * to do this until all other structures are fairly sane.
 588          */
 589         EVENTHANDLER_INVOKE(process_init, p);
 590         EVENTHANDLER_INVOKE(thread_init, td);
 591         EVENTHANDLER_INVOKE(process_ctor, p);
 592         EVENTHANDLER_INVOKE(thread_ctor, td);
 593
 594         /*
 595          * Charge root for one process.
 596          */
 597         (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
 598         PROC_LOCK(p);
 599         racct_add_force(p, RACCT_NPROC, 1);
 600         PROC_UNLOCK(p);
 601 }
 602 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
 603
 604 /* ARGSUSED*/
 605 static void
 606 proc0_post(void *dummy __unused)
 607 {
 608         struct timespec ts;
 609         struct proc *p;
 610         struct rusage ru;
 611         struct thread *td;
 612
 613         /*
 614          * Now we can look at the time, having had a chance to verify the
 615          * time from the filesystem.  Pretend that proc0 started now.
 616          */
 617         sx_slock(&allproc_lock);
 618         FOREACH_PROC_IN_SYSTEM(p) {
 619                 microuptime(&p->p_stats->p_start);
 620                 PROC_STATLOCK(p);
 621                 rufetch(p, &ru);        /* Clears thread stats */
 622                 PROC_STATUNLOCK(p);
 623                 p->p_rux.rux_runtime = 0;
 624                 p->p_rux.rux_uticks = 0;
 625                 p->p_rux.rux_sticks = 0;
 626                 p->p_rux.rux_iticks = 0;
 627                 FOREACH_THREAD_IN_PROC(p, td) {
 628                         td->td_runtime = 0;
 629                 }
 630         }
 631         sx_sunlock(&allproc_lock);
 632         PCPU_SET(switchtime, cpu_ticks());
 633         PCPU_SET(switchticks, ticks);
 634
 635         /*
 636          * Give the ``random'' number generator a thump.
 637          */
 638         nanotime(&ts);
 639         srandom(ts.tv_sec ^ ts.tv_nsec);
 640 }
 641 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
 642
 643 static void
 644 random_init(void *dummy __unused)
 645 {
 646
 647         /*
 648          * After CPU has been started we have some randomness on most
 649          * platforms via get_cyclecount().  For platforms that don't
 650          * we will reseed random(9) in proc0_post() as well.
 651          */
 652         srandom(get_cyclecount());
 653 }
 654 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
 655
 656 /*
 657  ***************************************************************************
 658  ****
 659  **** The following SYSINIT's and glue code should be moved to the
 660  **** respective files on a per subsystem basis.
 661  ****
 662  ***************************************************************************
 663  */
 664
 665
 666 /*
 667  ***************************************************************************
 668  ****
 669  **** The following code probably belongs in another file, like
 670  **** kern/init_init.c.
 671  ****
 672  ***************************************************************************
 673  */
 674
 675 /*
 676  * List of paths to try when searching for "init".
 677  */
 678 static char init_path[MAXPATHLEN] =
 679 #ifdef  INIT_PATH
 680     __XSTRING(INIT_PATH);
 681 #else
 682     "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init";
 683 #endif
 684 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
 685         "Path used to search the init process");
 686
 687 /*
 688  * Shutdown timeout of init(8).
 689  * Unused within kernel, but used to control init(8), hence do not remove.
 690  */
 691 #ifndef INIT_SHUTDOWN_TIMEOUT
 692 #define INIT_SHUTDOWN_TIMEOUT 120
 693 #endif
 694 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
 695 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
 696         CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
 697         "Unused within kernel, but used to control init(8)");
 698
 699 /*
 700  * Start the initial user process; try exec'ing each pathname in init_path.
 701  * The program is invoked with one argument containing the boot flags.
 702  */
 703 static void
 704 start_init(void *dummy)
 705 {
 706         vm_offset_t addr;
 707         struct execve_args args;
 708         int options, error;
 709         char *var, *path, *next, *s;
 710         char *ucp, **uap, *arg0, *arg1;
 711         struct thread *td;
 712         struct proc *p;
 713
 714         mtx_lock(&Giant);
 715
 716         GIANT_REQUIRED;
 717
 718         td = curthread;
 719         p = td->td_proc;
 720
 721         vfs_mountroot();
 722
 723         /* Wipe GELI passphrase from the environment. */
 724         kern_unsetenv("kern.geom.eli.passphrase");
 725
 726         /*
 727          * Need just enough stack to hold the faked-up "execve()" arguments.
 728          */
 729         addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
 730         if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 0,
 731             VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
 732                 panic("init: couldn't allocate argument space");
 733         p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
 734         p->p_vmspace->vm_ssize = 1;
 735
 736         if ((var = kern_getenv("init_path")) != NULL) {
 737                 strlcpy(init_path, var, sizeof(init_path));
 738                 freeenv(var);
 739         }
 740
 741         for (path = init_path; *path != '\0'; path = next) {
 742                 while (*path == ':')
 743                         path++;
 744                 if (*path == '\0')
 745                         break;
 746                 for (next = path; *next != '\0' && *next != ':'; next++)
 747                         /* nothing */ ;
 748                 if (bootverbose)
 749                         printf("start_init: trying %.*s\n", (int)(next - path),
 750                             path);
 751
 752                 /*
 753                  * Move out the boot flag argument.
 754                  */
 755                 options = 0;
 756                 ucp = (char *)p->p_sysent->sv_usrstack;
 757                 (void)subyte(--ucp, 0);         /* trailing zero */
 758                 if (boothowto & RB_SINGLE) {
 759                         (void)subyte(--ucp, 's');
 760                         options = 1;
 761                 }
 762 #ifdef notyet
 763                 if (boothowto & RB_FASTBOOT) {
 764                         (void)subyte(--ucp, 'f');
 765                         options = 1;
 766                 }
 767 #endif
 768
 769 #ifdef BOOTCDROM
 770                 (void)subyte(--ucp, 'C');
 771                 options = 1;
 772 #endif
 773
 774                 if (options == 0)
 775                         (void)subyte(--ucp, '-');
 776                 (void)subyte(--ucp, '-');               /* leading hyphen */
 777                 arg1 = ucp;
 778
 779                 /*
 780                  * Move out the file name (also arg 0).
 781                  */
 782                 (void)subyte(--ucp, 0);
 783                 for (s = next - 1; s >= path; s--)
 784                         (void)subyte(--ucp, *s);
 785                 arg0 = ucp;
 786
 787                 /*
 788                  * Move out the arg pointers.
 789                  */
 790                 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
 791                 (void)suword((caddr_t)--uap, (long)0);  /* terminator */
 792                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
 793                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
 794
 795                 /*
 796                  * Point at the arguments.
 797                  */
 798                 args.fname = arg0;
 799                 args.argv = uap;
 800                 args.envv = NULL;
 801
 802                 /*
 803                  * Now try to exec the program.  If can't for any reason
 804                  * other than it doesn't exist, complain.
 805                  *
 806                  * Otherwise, return via fork_trampoline() all the way
 807                  * to user mode as init!
 808                  */
 809                 if ((error = sys_execve(td, &args)) == 0) {
 810                         mtx_unlock(&Giant);
 811                         return;
 812                 }
 813                 if (error != ENOENT)
 814                         printf("exec %.*s: error %d\n", (int)(next - path),
 815                             path, error);
 816         }
 817         printf("init: not found in path %s\n", init_path);
 818         panic("no init");
 819 }
 820
 821 /*
 822  * Like kproc_create(), but runs in it's own address space.
 823  * We do this early to reserve pid 1.
 824  *
 825  * Note special case - do not make it runnable yet.  Other work
 826  * in progress will change this more.
 827  */
 828 static void
 829 create_init(const void *udata __unused)
 830 {
 831         struct fork_req fr;
 832         struct ucred *newcred, *oldcred;
 833         struct thread *td;
 834         int error;
 835
 836         bzero(&fr, sizeof(fr));
 837         fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
 838         fr.fr_procp = &initproc;
 839         error = fork1(&thread0, &fr);
 840         if (error)
 841                 panic("cannot fork init: %d\n", error);
 842         KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
 843         /* divorce init's credentials from the kernel's */
 844         newcred = crget();
 845         sx_xlock(&proctree_lock);
 846         PROC_LOCK(initproc);
 847         initproc->p_flag |= P_SYSTEM | P_INMEM;
 848         initproc->p_treeflag |= P_TREE_REAPER;
 849         LIST_INSERT_HEAD(&initproc->p_reaplist, &proc0, p_reapsibling);
 850         oldcred = initproc->p_ucred;
 851         crcopy(newcred, oldcred);
 852 #ifdef MAC
 853         mac_cred_create_init(newcred);
 854 #endif
 855 #ifdef AUDIT
 856         audit_cred_proc1(newcred);
 857 #endif
 858         proc_set_cred(initproc, newcred);
 859         td = FIRST_THREAD_IN_PROC(initproc);
 860         crfree(td->td_ucred);
 861         td->td_ucred = crhold(initproc->p_ucred);
 862         PROC_UNLOCK(initproc);
 863         sx_xunlock(&proctree_lock);
 864         crfree(oldcred);
 865         cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL);
 866 }
 867 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
 868
 869 /*
 870  * Make it runnable now.
 871  */
 872 static void
 873 kick_init(const void *udata __unused)
 874 {
 875         struct thread *td;
 876
 877         td = FIRST_THREAD_IN_PROC(initproc);
 878         thread_lock(td);
 879         TD_SET_CAN_RUN(td);
 880         sched_add(td, SRQ_BORING);
 881         thread_unlock(td);
 882 }
 883 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL);