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
  50 #include <sys/param.h>
  51 #include <sys/kernel.h>
  52 #include <sys/exec.h>
  53 #include <sys/file.h>
  54 #include <sys/filedesc.h>
  55 #include <sys/jail.h>
  56 #include <sys/ktr.h>
  57 #include <sys/lock.h>
  58 #include <sys/mount.h>
  59 #include <sys/mutex.h>
  60 #include <sys/syscallsubr.h>
  61 #include <sys/sysctl.h>
  62 #include <sys/proc.h>
  63 #include <sys/resourcevar.h>
  64 #include <sys/systm.h>
  65 #include <sys/signalvar.h>
  66 #include <sys/vnode.h>
  67 #include <sys/sysent.h>
  68 #include <sys/reboot.h>
  69 #include <sys/sched.h>
  70 #include <sys/sx.h>
  71 #include <sys/sysproto.h>
  72 #include <sys/vmmeter.h>
  73 #include <sys/unistd.h>
  74 #include <sys/malloc.h>
  75 #include <sys/conf.h>
  76 #include <sys/cpuset.h>
  77
  78 #include <machine/cpu.h>
  79
  80 #include <security/audit/audit.h>
  81 #include <security/mac/mac_framework.h>
  82
  83 #include <vm/vm.h>
  84 #include <vm/vm_param.h>
  85 #include <vm/pmap.h>
  86 #include <vm/vm_map.h>
  87 #include <sys/copyright.h>
  88
  89 #include <ddb/ddb.h>
  90 #include <ddb/db_sym.h>
  91
  92 void mi_startup(void);                          /* Should be elsewhere */
  93
  94 /* Components of the first process -- never freed. */
  95 static struct session session0;
  96 static struct pgrp pgrp0;
  97 struct  proc proc0;
  98 struct  thread thread0 __aligned(16);
  99 struct  vmspace vmspace0;
 100 struct  proc *initproc;
 101
 102 int     boothowto = 0;          /* initialized so that it can be patched */
 103 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
 104         "Boot control flags, passed from loader");
 105 int     bootverbose;
 106 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
 107         "Control the output of verbose kernel messages");
 108
 109 /*
 110  * This ensures that there is at least one entry so that the sysinit_set
 111  * symbol is not undefined.  A sybsystem ID of SI_SUB_DUMMY is never
 112  * executed.
 113  */
 114 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
 115
 116 /*
 117  * The sysinit table itself.  Items are checked off as the are run.
 118  * If we want to register new sysinit types, add them to newsysinit.
 119  */
 120 SET_DECLARE(sysinit_set, struct sysinit);
 121 struct sysinit **sysinit, **sysinit_end;
 122 struct sysinit **newsysinit, **newsysinit_end;
 123
 124 /*
 125  * Merge a new sysinit set into the current set, reallocating it if
 126  * necessary.  This can only be called after malloc is running.
 127  */
 128 void
 129 sysinit_add(struct sysinit **set, struct sysinit **set_end)
 130 {
 131         struct sysinit **newset;
 132         struct sysinit **sipp;
 133         struct sysinit **xipp;
 134         int count;
 135
 136         count = set_end - set;
 137         if (newsysinit)
 138                 count += newsysinit_end - newsysinit;
 139         else
 140                 count += sysinit_end - sysinit;
 141         newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
 142         if (newset == NULL)
 143                 panic("cannot malloc for sysinit");
 144         xipp = newset;
 145         if (newsysinit)
 146                 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
 147                         *xipp++ = *sipp;
 148         else
 149                 for (sipp = sysinit; sipp < sysinit_end; sipp++)
 150                         *xipp++ = *sipp;
 151         for (sipp = set; sipp < set_end; sipp++)
 152                 *xipp++ = *sipp;
 153         if (newsysinit)
 154                 free(newsysinit, M_TEMP);
 155         newsysinit = newset;
 156         newsysinit_end = newset + count;
 157 }
 158
 159 /*
 160  * System startup; initialize the world, create process 0, mount root
 161  * filesystem, and fork to create init and pagedaemon.  Most of the
 162  * hard work is done in the lower-level initialization routines including
 163  * startup(), which does memory initialization and autoconfiguration.
 164  *
 165  * This allows simple addition of new kernel subsystems that require
 166  * boot time initialization.  It also allows substitution of subsystem
 167  * (for instance, a scheduler, kernel profiler, or VM system) by object
 168  * module.  Finally, it allows for optional "kernel threads".
 169  */
 170 void
 171 mi_startup(void)
 172 {
 173
 174         register struct sysinit **sipp;         /* system initialization*/
 175         register struct sysinit **xipp;         /* interior loop of sort*/
 176         register struct sysinit *save;          /* bubble*/
 177
 178 #if defined(VERBOSE_SYSINIT)
 179         int last;
 180         int verbose;
 181 #endif
 182
 183         if (boothowto & RB_VERBOSE)
 184                 bootverbose++;
 185
 186         if (sysinit == NULL) {
 187                 sysinit = SET_BEGIN(sysinit_set);
 188                 sysinit_end = SET_LIMIT(sysinit_set);
 189         }
 190
 191 restart:
 192         /*
 193          * Perform a bubble sort of the system initialization objects by
 194          * their subsystem (primary key) and order (secondary key).
 195          */
 196         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
 197                 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
 198                         if ((*sipp)->subsystem < (*xipp)->subsystem ||
 199                              ((*sipp)->subsystem == (*xipp)->subsystem &&
 200                               (*sipp)->order <= (*xipp)->order))
 201                                 continue;       /* skip*/
 202                         save = *sipp;
 203                         *sipp = *xipp;
 204                         *xipp = save;
 205                 }
 206         }
 207
 208 #if defined(VERBOSE_SYSINIT)
 209         last = SI_SUB_COPYRIGHT;
 210         verbose = 0;
 211 #if !defined(DDB)
 212         printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
 213 #endif
 214 #endif
 215
 216         /*
 217          * Traverse the (now) ordered list of system initialization tasks.
 218          * Perform each task, and continue on to the next task.
 219          *
 220          * The last item on the list is expected to be the scheduler,
 221          * which will not return.
 222          */
 223         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
 224
 225                 if ((*sipp)->subsystem == SI_SUB_DUMMY)
 226                         continue;       /* skip dummy task(s)*/
 227
 228                 if ((*sipp)->subsystem == SI_SUB_DONE)
 229                         continue;
 230
 231 #if defined(VERBOSE_SYSINIT)
 232                 if ((*sipp)->subsystem > last) {
 233                         verbose = 1;
 234                         last = (*sipp)->subsystem;
 235                         printf("subsystem %x\n", last);
 236                 }
 237                 if (verbose) {
 238 #if defined(DDB)
 239                         const char *name;
 240                         c_db_sym_t sym;
 241                         db_expr_t  offset;
 242
 243                         sym = db_search_symbol((vm_offset_t)(*sipp)->func,
 244                             DB_STGY_PROC, &offset);
 245                         db_symbol_values(sym, &name, NULL);
 246                         if (name != NULL)
 247                                 printf("   %s(%p)... ", name, (*sipp)->udata);
 248                         else
 249 #endif
 250                                 printf("   %p(%p)... ", (*sipp)->func,
 251                                     (*sipp)->udata);
 252                 }
 253 #endif
 254
 255                 /* Call function */
 256                 (*((*sipp)->func))((*sipp)->udata);
 257
 258 #if defined(VERBOSE_SYSINIT)
 259                 if (verbose)
 260                         printf("done.\n");
 261 #endif
 262
 263                 /* Check off the one we're just done */
 264                 (*sipp)->subsystem = SI_SUB_DONE;
 265
 266                 /* Check if we've installed more sysinit items via KLD */
 267                 if (newsysinit != NULL) {
 268                         if (sysinit != SET_BEGIN(sysinit_set))
 269                                 free(sysinit, M_TEMP);
 270                         sysinit = newsysinit;
 271                         sysinit_end = newsysinit_end;
 272                         newsysinit = NULL;
 273                         newsysinit_end = NULL;
 274                         goto restart;
 275                 }
 276         }
 277
 278         panic("Shouldn't get here!");
 279         /* NOTREACHED*/
 280 }
 281
 282
 283 /*
 284  ***************************************************************************
 285  ****
 286  **** The following SYSINIT's belong elsewhere, but have not yet
 287  **** been moved.
 288  ****
 289  ***************************************************************************
 290  */
 291 static void
 292 print_caddr_t(void *data)
 293 {
 294         printf("%s", (char *)data);
 295 }
 296
 297 static void
 298 print_version(void *data __unused)
 299 {
 300         int len;
 301
 302         /* Strip a trailing newline from version. */
 303         len = strlen(version);
 304         while (len > 0 && version[len - 1] == '\n')
 305                 len--;
 306         printf("%.*s %s\n", len, version, machine);
 307 }
 308
 309 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
 310     copyright);
 311 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
 312     trademark);
 313 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
 314
 315 #ifdef WITNESS
 316 static char wit_warn[] =
 317      "WARNING: WITNESS option enabled, expect reduced performance.\n";
 318 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
 319    print_caddr_t, wit_warn);
 320 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1,
 321    print_caddr_t, wit_warn);
 322 #endif
 323
 324 #ifdef DIAGNOSTIC
 325 static char diag_warn[] =
 326      "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
 327 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
 328     print_caddr_t, diag_warn);
 329 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2,
 330     print_caddr_t, diag_warn);
 331 #endif
 332
 333 static int
 334 null_fetch_syscall_args(struct thread *td __unused,
 335     struct syscall_args *sa __unused)
 336 {
 337
 338         panic("null_fetch_syscall_args");
 339 }
 340
 341 static void
 342 null_set_syscall_retval(struct thread *td __unused, int error __unused)
 343 {
 344
 345         panic("null_set_syscall_retval");
 346 }
 347
 348 struct sysentvec null_sysvec = {
 349         .sv_size        = 0,
 350         .sv_table       = NULL,
 351         .sv_mask        = 0,
 352         .sv_sigsize     = 0,
 353         .sv_sigtbl      = NULL,
 354         .sv_errsize     = 0,
 355         .sv_errtbl      = NULL,
 356         .sv_transtrap   = NULL,
 357         .sv_fixup       = NULL,
 358         .sv_sendsig     = NULL,
 359         .sv_sigcode     = NULL,
 360         .sv_szsigcode   = NULL,
 361         .sv_prepsyscall = NULL,
 362         .sv_name        = "null",
 363         .sv_coredump    = NULL,
 364         .sv_imgact_try  = NULL,
 365         .sv_minsigstksz = 0,
 366         .sv_pagesize    = PAGE_SIZE,
 367         .sv_minuser     = VM_MIN_ADDRESS,
 368         .sv_maxuser     = VM_MAXUSER_ADDRESS,
 369         .sv_usrstack    = USRSTACK,
 370         .sv_psstrings   = PS_STRINGS,
 371         .sv_stackprot   = VM_PROT_ALL,
 372         .sv_copyout_strings     = NULL,
 373         .sv_setregs     = NULL,
 374         .sv_fixlimit    = NULL,
 375         .sv_maxssiz     = NULL,
 376         .sv_flags       = 0,
 377         .sv_set_syscall_retval = null_set_syscall_retval,
 378         .sv_fetch_syscall_args = null_fetch_syscall_args,
 379         .sv_syscallnames = NULL,
 380 };
 381
 382 /*
 383  ***************************************************************************
 384  ****
 385  **** The two following SYSINIT's are proc0 specific glue code.  I am not
 386  **** convinced that they can not be safely combined, but their order of
 387  **** operation has been maintained as the same as the original init_main.c
 388  **** for right now.
 389  ****
 390  **** These probably belong in init_proc.c or kern_proc.c, since they
 391  **** deal with proc0 (the fork template process).
 392  ****
 393  ***************************************************************************
 394  */
 395 /* ARGSUSED*/
 396 static void
 397 proc0_init(void *dummy __unused)
 398 {
 399         struct proc *p;
 400         struct thread *td;
 401         vm_paddr_t pageablemem;
 402         int i;
 403
 404         GIANT_REQUIRED;
 405         p = &proc0;
 406         td = &thread0;
 407
 408         /*
 409          * Initialize magic number and osrel.
 410          */
 411         p->p_magic = P_MAGIC;
 412         p->p_osrel = osreldate;
 413
 414         /*
 415          * Initialize thread and process structures.
 416          */
 417         procinit();     /* set up proc zone */
 418         threadinit();   /* set up UMA zones */
 419
 420         /*
 421          * Initialise scheduler resources.
 422          * Add scheduler specific parts to proc, thread as needed.
 423          */
 424         schedinit();    /* scheduler gets its house in order */
 425         /*
 426          * Initialize sleep queue hash table
 427          */
 428         sleepinit();
 429
 430         /*
 431          * additional VM structures
 432          */
 433         vm_init2();
 434
 435         /*
 436          * Create process 0 (the swapper).
 437          */
 438         LIST_INSERT_HEAD(&allproc, p, p_list);
 439         LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
 440         mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
 441         p->p_pgrp = &pgrp0;
 442         LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
 443         LIST_INIT(&pgrp0.pg_members);
 444         LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
 445
 446         pgrp0.pg_session = &session0;
 447         mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
 448         refcount_init(&session0.s_count, 1);
 449         session0.s_leader = p;
 450
 451         p->p_sysent = &null_sysvec;
 452         p->p_flag = P_SYSTEM | P_INMEM;
 453         p->p_state = PRS_NORMAL;
 454         knlist_init_mtx(&p->p_klist, &p->p_mtx);
 455         STAILQ_INIT(&p->p_ktr);
 456         p->p_nice = NZERO;
 457         td->td_tid = PID_MAX + 1;
 458         LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash);
 459         td->td_state = TDS_RUNNING;
 460         td->td_pri_class = PRI_TIMESHARE;
 461         td->td_user_pri = PUSER;
 462         td->td_base_user_pri = PUSER;
 463         td->td_priority = PVM;
 464         td->td_base_pri = PUSER;
 465         td->td_oncpu = 0;
 466         td->td_flags = TDF_INMEM|TDP_KTHREAD;
 467         td->td_cpuset = cpuset_thread0();
 468         prison0.pr_cpuset = cpuset_ref(td->td_cpuset);
 469         p->p_peers = 0;
 470         p->p_leader = p;
 471
 472
 473         strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
 474         strncpy(td->td_name, "swapper", sizeof (td->td_name));
 475
 476         callout_init(&p->p_itcallout, CALLOUT_MPSAFE);
 477         callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
 478         callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
 479
 480         /* Create credentials. */
 481         p->p_ucred = crget();
 482         p->p_ucred->cr_ngroups = 1;     /* group 0 */
 483         p->p_ucred->cr_uidinfo = uifind(0);
 484         p->p_ucred->cr_ruidinfo = uifind(0);
 485         p->p_ucred->cr_prison = &prison0;
 486 #ifdef AUDIT
 487         audit_cred_kproc0(p->p_ucred);
 488 #endif
 489 #ifdef MAC
 490         mac_cred_create_swapper(p->p_ucred);
 491 #endif
 492         td->td_ucred = crhold(p->p_ucred);
 493
 494         /* Create sigacts. */
 495         p->p_sigacts = sigacts_alloc();
 496
 497         /* Initialize signal state for process 0. */
 498         siginit(&proc0);
 499
 500         /* Create the file descriptor table. */
 501         p->p_fd = fdinit(NULL);
 502         p->p_fdtol = NULL;
 503
 504         /* Create the limits structures. */
 505         p->p_limit = lim_alloc();
 506         for (i = 0; i < RLIM_NLIMITS; i++)
 507                 p->p_limit->pl_rlimit[i].rlim_cur =
 508                     p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
 509         p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
 510             p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
 511         p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
 512             p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
 513         p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
 514         p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
 515         p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
 516         p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
 517         /* Cast to avoid overflow on i386/PAE. */
 518         pageablemem = ptoa((vm_paddr_t)cnt.v_free_count);
 519         p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
 520             p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
 521         p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
 522         p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
 523         p->p_cpulimit = RLIM_INFINITY;
 524
 525         p->p_stats = pstats_alloc();
 526
 527         /* Allocate a prototype map so we have something to fork. */
 528         pmap_pinit0(vmspace_pmap(&vmspace0));
 529         p->p_vmspace = &vmspace0;
 530         vmspace0.vm_refcnt = 1;
 531
 532         /*
 533          * proc0 is not expected to enter usermode, so there is no special
 534          * handling for sv_minuser here, like is done for exec_new_vmspace().
 535          */
 536         vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
 537             p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
 538
 539         /*
 540          * Call the init and ctor for the new thread and proc.  We wait
 541          * to do this until all other structures are fairly sane.
 542          */
 543         EVENTHANDLER_INVOKE(process_init, p);
 544         EVENTHANDLER_INVOKE(thread_init, td);
 545         EVENTHANDLER_INVOKE(process_ctor, p);
 546         EVENTHANDLER_INVOKE(thread_ctor, td);
 547
 548         /*
 549          * Charge root for one process.
 550          */
 551         (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
 552 }
 553 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
 554
 555 /* ARGSUSED*/
 556 static void
 557 proc0_post(void *dummy __unused)
 558 {
 559         struct timespec ts;
 560         struct proc *p;
 561         struct rusage ru;
 562         struct thread *td;
 563
 564         /*
 565          * Now we can look at the time, having had a chance to verify the
 566          * time from the filesystem.  Pretend that proc0 started now.
 567          */
 568         sx_slock(&allproc_lock);
 569         FOREACH_PROC_IN_SYSTEM(p) {
 570                 microuptime(&p->p_stats->p_start);
 571                 PROC_SLOCK(p);
 572                 rufetch(p, &ru);        /* Clears thread stats */
 573                 PROC_SUNLOCK(p);
 574                 p->p_rux.rux_runtime = 0;
 575                 p->p_rux.rux_uticks = 0;
 576                 p->p_rux.rux_sticks = 0;
 577                 p->p_rux.rux_iticks = 0;
 578                 FOREACH_THREAD_IN_PROC(p, td) {
 579                         td->td_runtime = 0;
 580                 }
 581         }
 582         sx_sunlock(&allproc_lock);
 583         PCPU_SET(switchtime, cpu_ticks());
 584         PCPU_SET(switchticks, ticks);
 585
 586         /*
 587          * Give the ``random'' number generator a thump.
 588          */
 589         nanotime(&ts);
 590         srandom(ts.tv_sec ^ ts.tv_nsec);
 591 }
 592 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
 593
 594 static void
 595 random_init(void *dummy __unused)
 596 {
 597
 598         /*
 599          * After CPU has been started we have some randomness on most
 600          * platforms via get_cyclecount().  For platforms that don't
 601          * we will reseed random(9) in proc0_post() as well.
 602          */
 603         srandom(get_cyclecount());
 604 }
 605 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
 606
 607 /*
 608  ***************************************************************************
 609  ****
 610  **** The following SYSINIT's and glue code should be moved to the
 611  **** respective files on a per subsystem basis.
 612  ****
 613  ***************************************************************************
 614  */
 615
 616
 617 /*
 618  ***************************************************************************
 619  ****
 620  **** The following code probably belongs in another file, like
 621  **** kern/init_init.c.
 622  ****
 623  ***************************************************************************
 624  */
 625
 626 /*
 627  * List of paths to try when searching for "init".
 628  */
 629 static char init_path[MAXPATHLEN] =
 630 #ifdef  INIT_PATH
 631     __XSTRING(INIT_PATH);
 632 #else
 633     "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall";
 634 #endif
 635 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
 636         "Path used to search the init process");
 637
 638 /*
 639  * Shutdown timeout of init(8).
 640  * Unused within kernel, but used to control init(8), hence do not remove.
 641  */
 642 #ifndef INIT_SHUTDOWN_TIMEOUT
 643 #define INIT_SHUTDOWN_TIMEOUT 120
 644 #endif
 645 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
 646 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
 647         CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
 648         "Unused within kernel, but used to control init(8)");
 649
 650 /*
 651  * Start the initial user process; try exec'ing each pathname in init_path.
 652  * The program is invoked with one argument containing the boot flags.
 653  */
 654 static void
 655 start_init(void *dummy)
 656 {
 657         vm_offset_t addr;
 658         struct execve_args args;
 659         int options, error;
 660         char *var, *path, *next, *s;
 661         char *ucp, **uap, *arg0, *arg1;
 662         struct thread *td;
 663         struct proc *p;
 664
 665         mtx_lock(&Giant);
 666
 667         GIANT_REQUIRED;
 668
 669         td = curthread;
 670         p = td->td_proc;
 671
 672         vfs_mountroot();
 673
 674         /*
 675          * Need just enough stack to hold the faked-up "execve()" arguments.
 676          */
 677         addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
 678         if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
 679                         FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
 680                 panic("init: couldn't allocate argument space");
 681         p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
 682         p->p_vmspace->vm_ssize = 1;
 683
 684         if ((var = getenv("init_path")) != NULL) {
 685                 strlcpy(init_path, var, sizeof(init_path));
 686                 freeenv(var);
 687         }
 688
 689         for (path = init_path; *path != '\0'; path = next) {
 690                 while (*path == ':')
 691                         path++;
 692                 if (*path == '\0')
 693                         break;
 694                 for (next = path; *next != '\0' && *next != ':'; next++)
 695                         /* nothing */ ;
 696                 if (bootverbose)
 697                         printf("start_init: trying %.*s\n", (int)(next - path),
 698                             path);
 699
 700                 /*
 701                  * Move out the boot flag argument.
 702                  */
 703                 options = 0;
 704                 ucp = (char *)p->p_sysent->sv_usrstack;
 705                 (void)subyte(--ucp, 0);         /* trailing zero */
 706                 if (boothowto & RB_SINGLE) {
 707                         (void)subyte(--ucp, 's');
 708                         options = 1;
 709                 }
 710 #ifdef notyet
 711                 if (boothowto & RB_FASTBOOT) {
 712                         (void)subyte(--ucp, 'f');
 713                         options = 1;
 714                 }
 715 #endif
 716
 717 #ifdef BOOTCDROM
 718                 (void)subyte(--ucp, 'C');
 719                 options = 1;
 720 #endif
 721
 722                 if (options == 0)
 723                         (void)subyte(--ucp, '-');
 724                 (void)subyte(--ucp, '-');               /* leading hyphen */
 725                 arg1 = ucp;
 726
 727                 /*
 728                  * Move out the file name (also arg 0).
 729                  */
 730                 (void)subyte(--ucp, 0);
 731                 for (s = next - 1; s >= path; s--)
 732                         (void)subyte(--ucp, *s);
 733                 arg0 = ucp;
 734
 735                 /*
 736                  * Move out the arg pointers.
 737                  */
 738                 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
 739                 (void)suword((caddr_t)--uap, (long)0);  /* terminator */
 740                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
 741                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
 742
 743                 /*
 744                  * Point at the arguments.
 745                  */
 746                 args.fname = arg0;
 747                 args.argv = uap;
 748                 args.envv = NULL;
 749
 750                 /*
 751                  * Now try to exec the program.  If can't for any reason
 752                  * other than it doesn't exist, complain.
 753                  *
 754                  * Otherwise, return via fork_trampoline() all the way
 755                  * to user mode as init!
 756                  */
 757                 if ((error = execve(td, &args)) == 0) {
 758                         mtx_unlock(&Giant);
 759                         return;
 760                 }
 761                 if (error != ENOENT)
 762                         printf("exec %.*s: error %d\n", (int)(next - path),
 763                             path, error);
 764         }
 765         printf("init: not found in path %s\n", init_path);
 766         panic("no init");
 767 }
 768
 769 /*
 770  * Like kproc_create(), but runs in it's own address space.
 771  * We do this early to reserve pid 1.
 772  *
 773  * Note special case - do not make it runnable yet.  Other work
 774  * in progress will change this more.
 775  */
 776 static void
 777 create_init(const void *udata __unused)
 778 {
 779         struct ucred *newcred, *oldcred;
 780         int error;
 781
 782         error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc);
 783         if (error)
 784                 panic("cannot fork init: %d\n", error);
 785         KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
 786         /* divorce init's credentials from the kernel's */
 787         newcred = crget();
 788         PROC_LOCK(initproc);
 789         initproc->p_flag |= P_SYSTEM | P_INMEM;
 790         oldcred = initproc->p_ucred;
 791         crcopy(newcred, oldcred);
 792 #ifdef MAC
 793         mac_cred_create_init(newcred);
 794 #endif
 795 #ifdef AUDIT
 796         audit_cred_proc1(newcred);
 797 #endif
 798         initproc->p_ucred = newcred;
 799         PROC_UNLOCK(initproc);
 800         crfree(oldcred);
 801         cred_update_thread(FIRST_THREAD_IN_PROC(initproc));
 802         cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL);
 803 }
 804 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
 805
 806 /*
 807  * Make it runnable now.
 808  */
 809 static void
 810 kick_init(const void *udata __unused)
 811 {
 812         struct thread *td;
 813
 814         td = FIRST_THREAD_IN_PROC(initproc);
 815         thread_lock(td);
 816         TD_SET_CAN_RUN(td);
 817         sched_add(td, SRQ_BORING);
 818         thread_unlock(td);
 819 }
 820 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);