The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/init_main.c

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    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: releng/8.3/sys/kern/init_main.c 229481 2012-01-04 13:53:50Z pluknet $");
   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 int     bootverbose;
  105 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, "");
  106 
  107 /*
  108  * This ensures that there is at least one entry so that the sysinit_set
  109  * symbol is not undefined.  A sybsystem ID of SI_SUB_DUMMY is never
  110  * executed.
  111  */
  112 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
  113 
  114 /*
  115  * The sysinit table itself.  Items are checked off as the are run.
  116  * If we want to register new sysinit types, add them to newsysinit.
  117  */
  118 SET_DECLARE(sysinit_set, struct sysinit);
  119 struct sysinit **sysinit, **sysinit_end;
  120 struct sysinit **newsysinit, **newsysinit_end;
  121 
  122 /*
  123  * Merge a new sysinit set into the current set, reallocating it if
  124  * necessary.  This can only be called after malloc is running.
  125  */
  126 void
  127 sysinit_add(struct sysinit **set, struct sysinit **set_end)
  128 {
  129         struct sysinit **newset;
  130         struct sysinit **sipp;
  131         struct sysinit **xipp;
  132         int count;
  133 
  134         count = set_end - set;
  135         if (newsysinit)
  136                 count += newsysinit_end - newsysinit;
  137         else
  138                 count += sysinit_end - sysinit;
  139         newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
  140         if (newset == NULL)
  141                 panic("cannot malloc for sysinit");
  142         xipp = newset;
  143         if (newsysinit)
  144                 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
  145                         *xipp++ = *sipp;
  146         else
  147                 for (sipp = sysinit; sipp < sysinit_end; sipp++)
  148                         *xipp++ = *sipp;
  149         for (sipp = set; sipp < set_end; sipp++)
  150                 *xipp++ = *sipp;
  151         if (newsysinit)
  152                 free(newsysinit, M_TEMP);
  153         newsysinit = newset;
  154         newsysinit_end = newset + count;
  155 }
  156 
  157 /*
  158  * System startup; initialize the world, create process 0, mount root
  159  * filesystem, and fork to create init and pagedaemon.  Most of the
  160  * hard work is done in the lower-level initialization routines including
  161  * startup(), which does memory initialization and autoconfiguration.
  162  *
  163  * This allows simple addition of new kernel subsystems that require
  164  * boot time initialization.  It also allows substitution of subsystem
  165  * (for instance, a scheduler, kernel profiler, or VM system) by object
  166  * module.  Finally, it allows for optional "kernel threads".
  167  */
  168 void
  169 mi_startup(void)
  170 {
  171 
  172         register struct sysinit **sipp;         /* system initialization*/
  173         register struct sysinit **xipp;         /* interior loop of sort*/
  174         register struct sysinit *save;          /* bubble*/
  175 
  176 #if defined(VERBOSE_SYSINIT)
  177         int last;
  178         int verbose;
  179 #endif
  180 
  181         if (boothowto & RB_VERBOSE)
  182                 bootverbose++;
  183 
  184         if (sysinit == NULL) {
  185                 sysinit = SET_BEGIN(sysinit_set);
  186                 sysinit_end = SET_LIMIT(sysinit_set);
  187         }
  188 
  189 restart:
  190         /*
  191          * Perform a bubble sort of the system initialization objects by
  192          * their subsystem (primary key) and order (secondary key).
  193          */
  194         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
  195                 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
  196                         if ((*sipp)->subsystem < (*xipp)->subsystem ||
  197                              ((*sipp)->subsystem == (*xipp)->subsystem &&
  198                               (*sipp)->order <= (*xipp)->order))
  199                                 continue;       /* skip*/
  200                         save = *sipp;
  201                         *sipp = *xipp;
  202                         *xipp = save;
  203                 }
  204         }
  205 
  206 #if defined(VERBOSE_SYSINIT)
  207         last = SI_SUB_COPYRIGHT;
  208         verbose = 0;
  209 #if !defined(DDB)
  210         printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
  211 #endif
  212 #endif
  213 
  214         /*
  215          * Traverse the (now) ordered list of system initialization tasks.
  216          * Perform each task, and continue on to the next task.
  217          *
  218          * The last item on the list is expected to be the scheduler,
  219          * which will not return.
  220          */
  221         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
  222 
  223                 if ((*sipp)->subsystem == SI_SUB_DUMMY)
  224                         continue;       /* skip dummy task(s)*/
  225 
  226                 if ((*sipp)->subsystem == SI_SUB_DONE)
  227                         continue;
  228 
  229 #if defined(VERBOSE_SYSINIT)
  230                 if ((*sipp)->subsystem > last) {
  231                         verbose = 1;
  232                         last = (*sipp)->subsystem;
  233                         printf("subsystem %x\n", last);
  234                 }
  235                 if (verbose) {
  236 #if defined(DDB)
  237                         const char *name;
  238                         c_db_sym_t sym;
  239                         db_expr_t  offset;
  240 
  241                         sym = db_search_symbol((vm_offset_t)(*sipp)->func,
  242                             DB_STGY_PROC, &offset);
  243                         db_symbol_values(sym, &name, NULL);
  244                         if (name != NULL)
  245                                 printf("   %s(%p)... ", name, (*sipp)->udata);
  246                         else
  247 #endif
  248                                 printf("   %p(%p)... ", (*sipp)->func,
  249                                     (*sipp)->udata);
  250                 }
  251 #endif
  252 
  253                 /* Call function */
  254                 (*((*sipp)->func))((*sipp)->udata);
  255 
  256 #if defined(VERBOSE_SYSINIT)
  257                 if (verbose)
  258                         printf("done.\n");
  259 #endif
  260 
  261                 /* Check off the one we're just done */
  262                 (*sipp)->subsystem = SI_SUB_DONE;
  263 
  264                 /* Check if we've installed more sysinit items via KLD */
  265                 if (newsysinit != NULL) {
  266                         if (sysinit != SET_BEGIN(sysinit_set))
  267                                 free(sysinit, M_TEMP);
  268                         sysinit = newsysinit;
  269                         sysinit_end = newsysinit_end;
  270                         newsysinit = NULL;
  271                         newsysinit_end = NULL;
  272                         goto restart;
  273                 }
  274         }
  275 
  276         panic("Shouldn't get here!");
  277         /* NOTREACHED*/
  278 }
  279 
  280 
  281 /*
  282  ***************************************************************************
  283  ****
  284  **** The following SYSINIT's belong elsewhere, but have not yet
  285  **** been moved.
  286  ****
  287  ***************************************************************************
  288  */
  289 static void
  290 print_caddr_t(void *data)
  291 {
  292         printf("%s", (char *)data);
  293 }
  294 
  295 static void
  296 print_version(void *data __unused)
  297 {
  298         int len;
  299 
  300         /* Strip a trailing newline from version. */
  301         len = strlen(version);
  302         while (len > 0 && version[len - 1] == '\n')
  303                 len--;
  304         printf("%.*s %s\n", len, version, machine);
  305 }
  306 
  307 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
  308     copyright);
  309 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
  310     trademark);
  311 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
  312 
  313 #ifdef WITNESS
  314 static char wit_warn[] =
  315      "WARNING: WITNESS option enabled, expect reduced performance.\n";
  316 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
  317    print_caddr_t, wit_warn);
  318 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1,
  319    print_caddr_t, wit_warn);
  320 #endif
  321 
  322 #ifdef DIAGNOSTIC
  323 static char diag_warn[] =
  324      "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
  325 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
  326     print_caddr_t, diag_warn);
  327 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2,
  328     print_caddr_t, diag_warn);
  329 #endif
  330 
  331 static int
  332 null_fetch_syscall_args(struct thread *td __unused,
  333     struct syscall_args *sa __unused)
  334 {
  335 
  336         panic("null_fetch_syscall_args");
  337 }
  338 
  339 static void
  340 null_set_syscall_retval(struct thread *td __unused, int error __unused)
  341 {
  342 
  343         panic("null_set_syscall_retval");
  344 }
  345 
  346 struct sysentvec null_sysvec = {
  347         .sv_size        = 0,
  348         .sv_table       = NULL,
  349         .sv_mask        = 0,
  350         .sv_sigsize     = 0,
  351         .sv_sigtbl      = NULL,
  352         .sv_errsize     = 0,
  353         .sv_errtbl      = NULL,
  354         .sv_transtrap   = NULL,
  355         .sv_fixup       = NULL,
  356         .sv_sendsig     = NULL,
  357         .sv_sigcode     = NULL,
  358         .sv_szsigcode   = NULL,
  359         .sv_prepsyscall = NULL,
  360         .sv_name        = "null",
  361         .sv_coredump    = NULL,
  362         .sv_imgact_try  = NULL,
  363         .sv_minsigstksz = 0,
  364         .sv_pagesize    = PAGE_SIZE,
  365         .sv_minuser     = VM_MIN_ADDRESS,
  366         .sv_maxuser     = VM_MAXUSER_ADDRESS,
  367         .sv_usrstack    = USRSTACK,
  368         .sv_psstrings   = PS_STRINGS,
  369         .sv_stackprot   = VM_PROT_ALL,
  370         .sv_copyout_strings     = NULL,
  371         .sv_setregs     = NULL,
  372         .sv_fixlimit    = NULL,
  373         .sv_maxssiz     = NULL,
  374         .sv_flags       = 0,
  375         .sv_set_syscall_retval = null_set_syscall_retval,
  376         .sv_fetch_syscall_args = null_fetch_syscall_args,
  377         .sv_syscallnames = NULL,
  378         .sv_schedtail   = NULL,
  379 };
  380 
  381 /*
  382  ***************************************************************************
  383  ****
  384  **** The two following SYSINIT's are proc0 specific glue code.  I am not
  385  **** convinced that they can not be safely combined, but their order of
  386  **** operation has been maintained as the same as the original init_main.c
  387  **** for right now.
  388  ****
  389  **** These probably belong in init_proc.c or kern_proc.c, since they
  390  **** deal with proc0 (the fork template process).
  391  ****
  392  ***************************************************************************
  393  */
  394 /* ARGSUSED*/
  395 static void
  396 proc0_init(void *dummy __unused)
  397 {
  398         struct proc *p;
  399         unsigned i;
  400         struct thread *td;
  401 
  402         GIANT_REQUIRED;
  403         p = &proc0;
  404         td = &thread0;
  405         
  406         /*
  407          * Initialize magic number and osrel.
  408          */
  409         p->p_magic = P_MAGIC;
  410         p->p_osrel = osreldate;
  411 
  412         /*
  413          * Initialize thread and process structures.
  414          */
  415         procinit();     /* set up proc zone */
  416         threadinit();   /* set up UMA zones */
  417 
  418         /*
  419          * Initialise scheduler resources.
  420          * Add scheduler specific parts to proc, thread as needed.
  421          */
  422         schedinit();    /* scheduler gets its house in order */
  423         /*
  424          * Initialize sleep queue hash table
  425          */
  426         sleepinit();
  427 
  428         /*
  429          * additional VM structures
  430          */
  431         vm_init2();
  432 
  433         /*
  434          * Create process 0 (the swapper).
  435          */
  436         LIST_INSERT_HEAD(&allproc, p, p_list);
  437         LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
  438         mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
  439         p->p_pgrp = &pgrp0;
  440         LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
  441         LIST_INIT(&pgrp0.pg_members);
  442         LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
  443 
  444         pgrp0.pg_session = &session0;
  445         mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
  446         refcount_init(&session0.s_count, 1);
  447         session0.s_leader = p;
  448 
  449         p->p_sysent = &null_sysvec;
  450         p->p_flag = P_SYSTEM | P_INMEM;
  451         p->p_state = PRS_NORMAL;
  452         knlist_init_mtx(&p->p_klist, &p->p_mtx);
  453         STAILQ_INIT(&p->p_ktr);
  454         p->p_nice = NZERO;
  455         td->td_tid = PID_MAX + 1;
  456         td->td_state = TDS_RUNNING;
  457         td->td_pri_class = PRI_TIMESHARE;
  458         td->td_user_pri = PUSER;
  459         td->td_base_user_pri = PUSER;
  460         td->td_priority = PVM;
  461         td->td_base_pri = PVM;
  462         td->td_oncpu = 0;
  463         td->td_flags = TDF_INMEM|TDP_KTHREAD;
  464         td->td_cpuset = cpuset_thread0();
  465         prison0.pr_cpuset = cpuset_ref(td->td_cpuset);
  466         p->p_peers = 0;
  467         p->p_leader = p;
  468 
  469 
  470         strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
  471         strncpy(td->td_name, "swapper", sizeof (td->td_name));
  472 
  473         callout_init(&p->p_itcallout, CALLOUT_MPSAFE);
  474         callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
  475         callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
  476 
  477         /* Create credentials. */
  478         p->p_ucred = crget();
  479         p->p_ucred->cr_ngroups = 1;     /* group 0 */
  480         p->p_ucred->cr_uidinfo = uifind(0);
  481         p->p_ucred->cr_ruidinfo = uifind(0);
  482         p->p_ucred->cr_prison = &prison0;
  483 #ifdef AUDIT
  484         audit_cred_kproc0(p->p_ucred);
  485 #endif
  486 #ifdef MAC
  487         mac_cred_create_swapper(p->p_ucred);
  488 #endif
  489         td->td_ucred = crhold(p->p_ucred);
  490 
  491         /* Create sigacts. */
  492         p->p_sigacts = sigacts_alloc();
  493 
  494         /* Initialize signal state for process 0. */
  495         siginit(&proc0);
  496 
  497         /* Create the file descriptor table. */
  498         p->p_fd = fdinit(NULL);
  499         p->p_fdtol = NULL;
  500 
  501         /* Create the limits structures. */
  502         p->p_limit = lim_alloc();
  503         for (i = 0; i < RLIM_NLIMITS; i++)
  504                 p->p_limit->pl_rlimit[i].rlim_cur =
  505                     p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
  506         p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
  507             p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
  508         p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
  509             p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
  510         i = ptoa(cnt.v_free_count);
  511         p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = i;
  512         p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i;
  513         p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3;
  514         p->p_cpulimit = RLIM_INFINITY;
  515 
  516         p->p_stats = pstats_alloc();
  517 
  518         /* Allocate a prototype map so we have something to fork. */
  519         pmap_pinit0(vmspace_pmap(&vmspace0));
  520         p->p_vmspace = &vmspace0;
  521         vmspace0.vm_refcnt = 1;
  522 
  523         /*
  524          * proc0 is not expected to enter usermode, so there is no special
  525          * handling for sv_minuser here, like is done for exec_new_vmspace().
  526          */
  527         vm_map_init(&vmspace0.vm_map, p->p_sysent->sv_minuser,
  528             p->p_sysent->sv_maxuser);
  529         vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0);
  530 
  531         /*-
  532          * call the init and ctor for the new thread and proc
  533          * we wait to do this until all other structures
  534          * are fairly sane.
  535          */
  536         EVENTHANDLER_INVOKE(process_init, p);
  537         EVENTHANDLER_INVOKE(thread_init, td);
  538         EVENTHANDLER_INVOKE(process_ctor, p);
  539         EVENTHANDLER_INVOKE(thread_ctor, td);
  540 
  541         /*
  542          * Charge root for one process.
  543          */
  544         (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
  545 }
  546 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
  547 
  548 /* ARGSUSED*/
  549 static void
  550 proc0_post(void *dummy __unused)
  551 {
  552         struct timespec ts;
  553         struct proc *p;
  554         struct rusage ru;
  555         struct thread *td;
  556 
  557         /*
  558          * Now we can look at the time, having had a chance to verify the
  559          * time from the filesystem.  Pretend that proc0 started now.
  560          */
  561         sx_slock(&allproc_lock);
  562         FOREACH_PROC_IN_SYSTEM(p) {
  563                 microuptime(&p->p_stats->p_start);
  564                 PROC_SLOCK(p);
  565                 rufetch(p, &ru);        /* Clears thread stats */
  566                 PROC_SUNLOCK(p);
  567                 p->p_rux.rux_runtime = 0;
  568                 p->p_rux.rux_uticks = 0;
  569                 p->p_rux.rux_sticks = 0;
  570                 p->p_rux.rux_iticks = 0;
  571                 FOREACH_THREAD_IN_PROC(p, td) {
  572                         td->td_runtime = 0;
  573                 }
  574         }
  575         sx_sunlock(&allproc_lock);
  576         PCPU_SET(switchtime, cpu_ticks());
  577         PCPU_SET(switchticks, ticks);
  578 
  579         /*
  580          * Give the ``random'' number generator a thump.
  581          */
  582         nanotime(&ts);
  583         srandom(ts.tv_sec ^ ts.tv_nsec);
  584 }
  585 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
  586 
  587 static void
  588 random_init(void *dummy __unused)
  589 {
  590 
  591         /*
  592          * After CPU has been started we have some randomness on most
  593          * platforms via get_cyclecount().  For platforms that don't
  594          * we will reseed random(9) in proc0_post() as well.
  595          */
  596         srandom(get_cyclecount());
  597 }
  598 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
  599 
  600 /*
  601  ***************************************************************************
  602  ****
  603  **** The following SYSINIT's and glue code should be moved to the
  604  **** respective files on a per subsystem basis.
  605  ****
  606  ***************************************************************************
  607  */
  608 
  609 
  610 /*
  611  ***************************************************************************
  612  ****
  613  **** The following code probably belongs in another file, like
  614  **** kern/init_init.c.
  615  ****
  616  ***************************************************************************
  617  */
  618 
  619 /*
  620  * List of paths to try when searching for "init".
  621  */
  622 static char init_path[MAXPATHLEN] =
  623 #ifdef  INIT_PATH
  624     __XSTRING(INIT_PATH);
  625 #else
  626     "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall";
  627 #endif
  628 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
  629         "Path used to search the init process");
  630 
  631 /*
  632  * Shutdown timeout of init(8).
  633  * Unused within kernel, but used to control init(8), hence do not remove.
  634  */
  635 #ifndef INIT_SHUTDOWN_TIMEOUT
  636 #define INIT_SHUTDOWN_TIMEOUT 120
  637 #endif
  638 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
  639 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
  640         CTLFLAG_RW, &init_shutdown_timeout, 0, "");
  641 
  642 /*
  643  * Start the initial user process; try exec'ing each pathname in init_path.
  644  * The program is invoked with one argument containing the boot flags.
  645  */
  646 static void
  647 start_init(void *dummy)
  648 {
  649         vm_offset_t addr;
  650         struct execve_args args;
  651         int options, error;
  652         char *var, *path, *next, *s;
  653         char *ucp, **uap, *arg0, *arg1;
  654         struct thread *td;
  655         struct proc *p;
  656 
  657         mtx_lock(&Giant);
  658 
  659         GIANT_REQUIRED;
  660 
  661         td = curthread;
  662         p = td->td_proc;
  663 
  664         vfs_mountroot();
  665 
  666         /*
  667          * Need just enough stack to hold the faked-up "execve()" arguments.
  668          */
  669         addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
  670         if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
  671                         FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
  672                 panic("init: couldn't allocate argument space");
  673         p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
  674         p->p_vmspace->vm_ssize = 1;
  675 
  676         if ((var = getenv("init_path")) != NULL) {
  677                 strlcpy(init_path, var, sizeof(init_path));
  678                 freeenv(var);
  679         }
  680         
  681         for (path = init_path; *path != '\0'; path = next) {
  682                 while (*path == ':')
  683                         path++;
  684                 if (*path == '\0')
  685                         break;
  686                 for (next = path; *next != '\0' && *next != ':'; next++)
  687                         /* nothing */ ;
  688                 if (bootverbose)
  689                         printf("start_init: trying %.*s\n", (int)(next - path),
  690                             path);
  691                         
  692                 /*
  693                  * Move out the boot flag argument.
  694                  */
  695                 options = 0;
  696                 ucp = (char *)p->p_sysent->sv_usrstack;
  697                 (void)subyte(--ucp, 0);         /* trailing zero */
  698                 if (boothowto & RB_SINGLE) {
  699                         (void)subyte(--ucp, 's');
  700                         options = 1;
  701                 }
  702 #ifdef notyet
  703                 if (boothowto & RB_FASTBOOT) {
  704                         (void)subyte(--ucp, 'f');
  705                         options = 1;
  706                 }
  707 #endif
  708 
  709 #ifdef BOOTCDROM
  710                 (void)subyte(--ucp, 'C');
  711                 options = 1;
  712 #endif
  713 
  714                 if (options == 0)
  715                         (void)subyte(--ucp, '-');
  716                 (void)subyte(--ucp, '-');               /* leading hyphen */
  717                 arg1 = ucp;
  718 
  719                 /*
  720                  * Move out the file name (also arg 0).
  721                  */
  722                 (void)subyte(--ucp, 0);
  723                 for (s = next - 1; s >= path; s--)
  724                         (void)subyte(--ucp, *s);
  725                 arg0 = ucp;
  726 
  727                 /*
  728                  * Move out the arg pointers.
  729                  */
  730                 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
  731                 (void)suword((caddr_t)--uap, (long)0);  /* terminator */
  732                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
  733                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
  734 
  735                 /*
  736                  * Point at the arguments.
  737                  */
  738                 args.fname = arg0;
  739                 args.argv = uap;
  740                 args.envv = NULL;
  741 
  742                 /*
  743                  * Now try to exec the program.  If can't for any reason
  744                  * other than it doesn't exist, complain.
  745                  *
  746                  * Otherwise, return via fork_trampoline() all the way
  747                  * to user mode as init!
  748                  */
  749                 if ((error = execve(td, &args)) == 0) {
  750                         mtx_unlock(&Giant);
  751                         return;
  752                 }
  753                 if (error != ENOENT)
  754                         printf("exec %.*s: error %d\n", (int)(next - path), 
  755                             path, error);
  756         }
  757         printf("init: not found in path %s\n", init_path);
  758         panic("no init");
  759 }
  760 
  761 /*
  762  * Like kproc_create(), but runs in it's own address space.
  763  * We do this early to reserve pid 1.
  764  *
  765  * Note special case - do not make it runnable yet.  Other work
  766  * in progress will change this more.
  767  */
  768 static void
  769 create_init(const void *udata __unused)
  770 {
  771         struct ucred *newcred, *oldcred;
  772         int error;
  773 
  774         error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc);
  775         if (error)
  776                 panic("cannot fork init: %d\n", error);
  777         KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
  778         /* divorce init's credentials from the kernel's */
  779         newcred = crget();
  780         PROC_LOCK(initproc);
  781         initproc->p_flag |= P_SYSTEM | P_INMEM;
  782         oldcred = initproc->p_ucred;
  783         crcopy(newcred, oldcred);
  784 #ifdef MAC
  785         mac_cred_create_init(newcred);
  786 #endif
  787 #ifdef AUDIT
  788         audit_cred_proc1(newcred);
  789 #endif
  790         initproc->p_ucred = newcred;
  791         PROC_UNLOCK(initproc);
  792         crfree(oldcred);
  793         cred_update_thread(FIRST_THREAD_IN_PROC(initproc));
  794         cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL);
  795 }
  796 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
  797 
  798 /*
  799  * Make it runnable now.
  800  */
  801 static void
  802 kick_init(const void *udata __unused)
  803 {
  804         struct thread *td;
  805 
  806         td = FIRST_THREAD_IN_PROC(initproc);
  807         thread_lock(td);
  808         TD_SET_CAN_RUN(td);
  809         sched_add(td, SRQ_BORING);
  810         thread_unlock(td);
  811 }
  812 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);

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