The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/kern/init_main.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    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/11.2/sys/kern/init_main.c 331727 2018-03-29 04:41:45Z mjoras $");
   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 thread0_storage thread0_st __aligned(32);
  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 EVENTHANDLER_LIST_DECLARE(process_init);
  140 EVENTHANDLER_LIST_DECLARE(thread_init);
  141 EVENTHANDLER_LIST_DECLARE(process_ctor);
  142 EVENTHANDLER_LIST_DECLARE(thread_ctor);
  143 
  144 /*
  145  * Merge a new sysinit set into the current set, reallocating it if
  146  * necessary.  This can only be called after malloc is running.
  147  */
  148 void
  149 sysinit_add(struct sysinit **set, struct sysinit **set_end)
  150 {
  151         struct sysinit **newset;
  152         struct sysinit **sipp;
  153         struct sysinit **xipp;
  154         int count;
  155 
  156         count = set_end - set;
  157         if (newsysinit)
  158                 count += newsysinit_end - newsysinit;
  159         else
  160                 count += sysinit_end - sysinit;
  161         newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
  162         if (newset == NULL)
  163                 panic("cannot malloc for sysinit");
  164         xipp = newset;
  165         if (newsysinit)
  166                 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
  167                         *xipp++ = *sipp;
  168         else
  169                 for (sipp = sysinit; sipp < sysinit_end; sipp++)
  170                         *xipp++ = *sipp;
  171         for (sipp = set; sipp < set_end; sipp++)
  172                 *xipp++ = *sipp;
  173         if (newsysinit)
  174                 free(newsysinit, M_TEMP);
  175         newsysinit = newset;
  176         newsysinit_end = newset + count;
  177 }
  178 
  179 #if defined (DDB) && defined(VERBOSE_SYSINIT)
  180 static const char *
  181 symbol_name(vm_offset_t va, db_strategy_t strategy)
  182 {
  183         const char *name;
  184         c_db_sym_t sym;
  185         db_expr_t  offset;
  186 
  187         if (va == 0)
  188                 return (NULL);
  189         sym = db_search_symbol(va, strategy, &offset);
  190         if (offset != 0)
  191                 return (NULL);
  192         db_symbol_values(sym, &name, NULL);
  193         return (name);
  194 }
  195 #endif
  196 
  197 /*
  198  * System startup; initialize the world, create process 0, mount root
  199  * filesystem, and fork to create init and pagedaemon.  Most of the
  200  * hard work is done in the lower-level initialization routines including
  201  * startup(), which does memory initialization and autoconfiguration.
  202  *
  203  * This allows simple addition of new kernel subsystems that require
  204  * boot time initialization.  It also allows substitution of subsystem
  205  * (for instance, a scheduler, kernel profiler, or VM system) by object
  206  * module.  Finally, it allows for optional "kernel threads".
  207  */
  208 void
  209 mi_startup(void)
  210 {
  211 
  212         register struct sysinit **sipp;         /* system initialization*/
  213         register struct sysinit **xipp;         /* interior loop of sort*/
  214         register struct sysinit *save;          /* bubble*/
  215 
  216 #if defined(VERBOSE_SYSINIT)
  217         int last;
  218         int verbose;
  219 #endif
  220 
  221         if (boothowto & RB_VERBOSE)
  222                 bootverbose++;
  223 
  224         if (sysinit == NULL) {
  225                 sysinit = SET_BEGIN(sysinit_set);
  226                 sysinit_end = SET_LIMIT(sysinit_set);
  227         }
  228 
  229 restart:
  230         /*
  231          * Perform a bubble sort of the system initialization objects by
  232          * their subsystem (primary key) and order (secondary key).
  233          */
  234         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
  235                 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
  236                         if ((*sipp)->subsystem < (*xipp)->subsystem ||
  237                              ((*sipp)->subsystem == (*xipp)->subsystem &&
  238                               (*sipp)->order <= (*xipp)->order))
  239                                 continue;       /* skip*/
  240                         save = *sipp;
  241                         *sipp = *xipp;
  242                         *xipp = save;
  243                 }
  244         }
  245 
  246 #if defined(VERBOSE_SYSINIT)
  247         last = SI_SUB_COPYRIGHT;
  248         verbose = 0;
  249 #if !defined(DDB)
  250         printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
  251 #endif
  252 #endif
  253 
  254         /*
  255          * Traverse the (now) ordered list of system initialization tasks.
  256          * Perform each task, and continue on to the next task.
  257          */
  258         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
  259 
  260                 if ((*sipp)->subsystem == SI_SUB_DUMMY)
  261                         continue;       /* skip dummy task(s)*/
  262 
  263                 if ((*sipp)->subsystem == SI_SUB_DONE)
  264                         continue;
  265 
  266 #if defined(VERBOSE_SYSINIT)
  267                 if ((*sipp)->subsystem > last) {
  268                         verbose = 1;
  269                         last = (*sipp)->subsystem;
  270                         printf("subsystem %x\n", last);
  271                 }
  272                 if (verbose) {
  273 #if defined(DDB)
  274                         const char *func, *data;
  275 
  276                         func = symbol_name((vm_offset_t)(*sipp)->func,
  277                             DB_STGY_PROC);
  278                         data = symbol_name((vm_offset_t)(*sipp)->udata,
  279                             DB_STGY_ANY);
  280                         if (func != NULL && data != NULL)
  281                                 printf("   %s(&%s)... ", func, data);
  282                         else if (func != NULL)
  283                                 printf("   %s(%p)... ", func, (*sipp)->udata);
  284                         else
  285 #endif
  286                                 printf("   %p(%p)... ", (*sipp)->func,
  287                                     (*sipp)->udata);
  288                 }
  289 #endif
  290 
  291                 /* Call function */
  292                 (*((*sipp)->func))((*sipp)->udata);
  293 
  294 #if defined(VERBOSE_SYSINIT)
  295                 if (verbose)
  296                         printf("done.\n");
  297 #endif
  298 
  299                 /* Check off the one we're just done */
  300                 (*sipp)->subsystem = SI_SUB_DONE;
  301 
  302                 /* Check if we've installed more sysinit items via KLD */
  303                 if (newsysinit != NULL) {
  304                         if (sysinit != SET_BEGIN(sysinit_set))
  305                                 free(sysinit, M_TEMP);
  306                         sysinit = newsysinit;
  307                         sysinit_end = newsysinit_end;
  308                         newsysinit = NULL;
  309                         newsysinit_end = NULL;
  310                         goto restart;
  311                 }
  312         }
  313 
  314         mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
  315         mtx_unlock(&Giant);
  316 
  317         /*
  318          * Now hand over this thread to swapper.
  319          */
  320         swapper();
  321         /* NOTREACHED*/
  322 }
  323 
  324 
  325 /*
  326  ***************************************************************************
  327  ****
  328  **** The following SYSINIT's belong elsewhere, but have not yet
  329  **** been moved.
  330  ****
  331  ***************************************************************************
  332  */
  333 static void
  334 print_caddr_t(void *data)
  335 {
  336         printf("%s", (char *)data);
  337 }
  338 
  339 static void
  340 print_version(void *data __unused)
  341 {
  342         int len;
  343 
  344         /* Strip a trailing newline from version. */
  345         len = strlen(version);
  346         while (len > 0 && version[len - 1] == '\n')
  347                 len--;
  348         printf("%.*s %s\n", len, version, machine);
  349         printf("%s\n", compiler_version);
  350 }
  351 
  352 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
  353     copyright);
  354 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
  355     trademark);
  356 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
  357 
  358 #ifdef WITNESS
  359 static char wit_warn[] =
  360      "WARNING: WITNESS option enabled, expect reduced performance.\n";
  361 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
  362    print_caddr_t, wit_warn);
  363 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1,
  364    print_caddr_t, wit_warn);
  365 #endif
  366 
  367 #ifdef DIAGNOSTIC
  368 static char diag_warn[] =
  369      "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
  370 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
  371     print_caddr_t, diag_warn);
  372 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2,
  373     print_caddr_t, diag_warn);
  374 #endif
  375 
  376 static int
  377 null_fetch_syscall_args(struct thread *td __unused)
  378 {
  379 
  380         panic("null_fetch_syscall_args");
  381 }
  382 
  383 static void
  384 null_set_syscall_retval(struct thread *td __unused, int error __unused)
  385 {
  386 
  387         panic("null_set_syscall_retval");
  388 }
  389 
  390 struct sysentvec null_sysvec = {
  391         .sv_size        = 0,
  392         .sv_table       = NULL,
  393         .sv_mask        = 0,
  394         .sv_errsize     = 0,
  395         .sv_errtbl      = NULL,
  396         .sv_transtrap   = NULL,
  397         .sv_fixup       = NULL,
  398         .sv_sendsig     = NULL,
  399         .sv_sigcode     = NULL,
  400         .sv_szsigcode   = NULL,
  401         .sv_name        = "null",
  402         .sv_coredump    = NULL,
  403         .sv_imgact_try  = NULL,
  404         .sv_minsigstksz = 0,
  405         .sv_pagesize    = PAGE_SIZE,
  406         .sv_minuser     = VM_MIN_ADDRESS,
  407         .sv_maxuser     = VM_MAXUSER_ADDRESS,
  408         .sv_usrstack    = USRSTACK,
  409         .sv_psstrings   = PS_STRINGS,
  410         .sv_stackprot   = VM_PROT_ALL,
  411         .sv_copyout_strings     = NULL,
  412         .sv_setregs     = NULL,
  413         .sv_fixlimit    = NULL,
  414         .sv_maxssiz     = NULL,
  415         .sv_flags       = 0,
  416         .sv_set_syscall_retval = null_set_syscall_retval,
  417         .sv_fetch_syscall_args = null_fetch_syscall_args,
  418         .sv_syscallnames = NULL,
  419         .sv_schedtail   = NULL,
  420         .sv_thread_detach = NULL,
  421         .sv_trap        = NULL,
  422 };
  423 
  424 /*
  425  ***************************************************************************
  426  ****
  427  **** The two following SYSINIT's are proc0 specific glue code.  I am not
  428  **** convinced that they can not be safely combined, but their order of
  429  **** operation has been maintained as the same as the original init_main.c
  430  **** for right now.
  431  ****
  432  **** These probably belong in init_proc.c or kern_proc.c, since they
  433  **** deal with proc0 (the fork template process).
  434  ****
  435  ***************************************************************************
  436  */
  437 /* ARGSUSED*/
  438 static void
  439 proc0_init(void *dummy __unused)
  440 {
  441         struct proc *p;
  442         struct thread *td;
  443         struct ucred *newcred;
  444         vm_paddr_t pageablemem;
  445         int i;
  446 
  447         GIANT_REQUIRED;
  448         p = &proc0;
  449         td = &thread0;
  450         
  451         /*
  452          * Initialize magic number and osrel.
  453          */
  454         p->p_magic = P_MAGIC;
  455         p->p_osrel = osreldate;
  456 
  457         /*
  458          * Initialize thread and process structures.
  459          */
  460         procinit();     /* set up proc zone */
  461         threadinit();   /* set up UMA zones */
  462 
  463         /*
  464          * Initialise scheduler resources.
  465          * Add scheduler specific parts to proc, thread as needed.
  466          */
  467         schedinit();    /* scheduler gets its house in order */
  468 
  469         /*
  470          * Create process 0 (the swapper).
  471          */
  472         LIST_INSERT_HEAD(&allproc, p, p_list);
  473         LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
  474         mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
  475         p->p_pgrp = &pgrp0;
  476         LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
  477         LIST_INIT(&pgrp0.pg_members);
  478         LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
  479 
  480         pgrp0.pg_session = &session0;
  481         mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
  482         refcount_init(&session0.s_count, 1);
  483         session0.s_leader = p;
  484 
  485         p->p_sysent = &null_sysvec;
  486         p->p_flag = P_SYSTEM | P_INMEM | P_KPROC;
  487         p->p_flag2 = 0;
  488         p->p_state = PRS_NORMAL;
  489         p->p_klist = knlist_alloc(&p->p_mtx);
  490         STAILQ_INIT(&p->p_ktr);
  491         p->p_nice = NZERO;
  492         /* pid_max cannot be greater than PID_MAX */
  493         td->td_tid = PID_MAX + 1;
  494         LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash);
  495         td->td_state = TDS_RUNNING;
  496         td->td_pri_class = PRI_TIMESHARE;
  497         td->td_user_pri = PUSER;
  498         td->td_base_user_pri = PUSER;
  499         td->td_lend_user_pri = PRI_MAX;
  500         td->td_priority = PVM;
  501         td->td_base_pri = PVM;
  502         td->td_oncpu = 0;
  503         td->td_flags = TDF_INMEM;
  504         td->td_pflags = TDP_KTHREAD;
  505         td->td_cpuset = cpuset_thread0();
  506         vm_domain_policy_init(&td->td_vm_dom_policy);
  507         vm_domain_policy_set(&td->td_vm_dom_policy, VM_POLICY_NONE, -1);
  508         vm_domain_policy_init(&p->p_vm_dom_policy);
  509         vm_domain_policy_set(&p->p_vm_dom_policy, VM_POLICY_NONE, -1);
  510         prison0_init();
  511         p->p_peers = 0;
  512         p->p_leader = p;
  513         p->p_reaper = p;
  514         LIST_INIT(&p->p_reaplist);
  515 
  516         strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
  517         strncpy(td->td_name, "swapper", sizeof (td->td_name));
  518 
  519         callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
  520         callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
  521         callout_init(&td->td_slpcallout, 1);
  522 
  523         /* Create credentials. */
  524         newcred = crget();
  525         newcred->cr_ngroups = 1;        /* group 0 */
  526         newcred->cr_uidinfo = uifind(0);
  527         newcred->cr_ruidinfo = uifind(0);
  528         newcred->cr_prison = &prison0;
  529         newcred->cr_loginclass = loginclass_find("default");
  530         proc_set_cred_init(p, newcred);
  531 #ifdef AUDIT
  532         audit_cred_kproc0(newcred);
  533 #endif
  534 #ifdef MAC
  535         mac_cred_create_swapper(newcred);
  536 #endif
  537         /* Create sigacts. */
  538         p->p_sigacts = sigacts_alloc();
  539 
  540         /* Initialize signal state for process 0. */
  541         siginit(&proc0);
  542 
  543         /* Create the file descriptor table. */
  544         p->p_fd = fdinit(NULL, false);
  545         p->p_fdtol = NULL;
  546 
  547         /* Create the limits structures. */
  548         p->p_limit = lim_alloc();
  549         for (i = 0; i < RLIM_NLIMITS; i++)
  550                 p->p_limit->pl_rlimit[i].rlim_cur =
  551                     p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
  552         p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
  553             p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
  554         p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
  555             p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
  556         p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
  557         p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
  558         p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
  559         p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
  560         /* Cast to avoid overflow on i386/PAE. */
  561         pageablemem = ptoa((vm_paddr_t)vm_cnt.v_free_count);
  562         p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
  563             p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
  564         p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
  565         p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
  566         p->p_cpulimit = RLIM_INFINITY;
  567 
  568         PROC_LOCK(p);
  569         thread_cow_get_proc(td, p);
  570         PROC_UNLOCK(p);
  571 
  572         /* Initialize resource accounting structures. */
  573         racct_create(&p->p_racct);
  574 
  575         p->p_stats = pstats_alloc();
  576 
  577         /* Allocate a prototype map so we have something to fork. */
  578         p->p_vmspace = &vmspace0;
  579         vmspace0.vm_refcnt = 1;
  580         pmap_pinit0(vmspace_pmap(&vmspace0));
  581 
  582         /*
  583          * proc0 is not expected to enter usermode, so there is no special
  584          * handling for sv_minuser here, like is done for exec_new_vmspace().
  585          */
  586         vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
  587             p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
  588 
  589         /*
  590          * Call the init and ctor for the new thread and proc.  We wait
  591          * to do this until all other structures are fairly sane.
  592          */
  593         EVENTHANDLER_DIRECT_INVOKE(process_init, p);
  594         EVENTHANDLER_DIRECT_INVOKE(thread_init, td);
  595         EVENTHANDLER_DIRECT_INVOKE(process_ctor, p);
  596         EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td);
  597 
  598         /*
  599          * Charge root for one process.
  600          */
  601         (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
  602         PROC_LOCK(p);
  603         racct_add_force(p, RACCT_NPROC, 1);
  604         PROC_UNLOCK(p);
  605 }
  606 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
  607 
  608 /* ARGSUSED*/
  609 static void
  610 proc0_post(void *dummy __unused)
  611 {
  612         struct timespec ts;
  613         struct proc *p;
  614         struct rusage ru;
  615         struct thread *td;
  616 
  617         /*
  618          * Now we can look at the time, having had a chance to verify the
  619          * time from the filesystem.  Pretend that proc0 started now.
  620          */
  621         sx_slock(&allproc_lock);
  622         FOREACH_PROC_IN_SYSTEM(p) {
  623                 microuptime(&p->p_stats->p_start);
  624                 PROC_STATLOCK(p);
  625                 rufetch(p, &ru);        /* Clears thread stats */
  626                 PROC_STATUNLOCK(p);
  627                 p->p_rux.rux_runtime = 0;
  628                 p->p_rux.rux_uticks = 0;
  629                 p->p_rux.rux_sticks = 0;
  630                 p->p_rux.rux_iticks = 0;
  631                 FOREACH_THREAD_IN_PROC(p, td) {
  632                         td->td_runtime = 0;
  633                 }
  634         }
  635         sx_sunlock(&allproc_lock);
  636         PCPU_SET(switchtime, cpu_ticks());
  637         PCPU_SET(switchticks, ticks);
  638 
  639         /*
  640          * Give the ``random'' number generator a thump.
  641          */
  642         nanotime(&ts);
  643         srandom(ts.tv_sec ^ ts.tv_nsec);
  644 }
  645 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
  646 
  647 static void
  648 random_init(void *dummy __unused)
  649 {
  650 
  651         /*
  652          * After CPU has been started we have some randomness on most
  653          * platforms via get_cyclecount().  For platforms that don't
  654          * we will reseed random(9) in proc0_post() as well.
  655          */
  656         srandom(get_cyclecount());
  657 }
  658 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
  659 
  660 /*
  661  ***************************************************************************
  662  ****
  663  **** The following SYSINIT's and glue code should be moved to the
  664  **** respective files on a per subsystem basis.
  665  ****
  666  ***************************************************************************
  667  */
  668 
  669 
  670 /*
  671  ***************************************************************************
  672  ****
  673  **** The following code probably belongs in another file, like
  674  **** kern/init_init.c.
  675  ****
  676  ***************************************************************************
  677  */
  678 
  679 /*
  680  * List of paths to try when searching for "init".
  681  */
  682 static char init_path[MAXPATHLEN] =
  683 #ifdef  INIT_PATH
  684     __XSTRING(INIT_PATH);
  685 #else
  686     "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init";
  687 #endif
  688 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
  689         "Path used to search the init process");
  690 
  691 /*
  692  * Shutdown timeout of init(8).
  693  * Unused within kernel, but used to control init(8), hence do not remove.
  694  */
  695 #ifndef INIT_SHUTDOWN_TIMEOUT
  696 #define INIT_SHUTDOWN_TIMEOUT 120
  697 #endif
  698 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
  699 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
  700         CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
  701         "Unused within kernel, but used to control init(8)");
  702 
  703 /*
  704  * Start the initial user process; try exec'ing each pathname in init_path.
  705  * The program is invoked with one argument containing the boot flags.
  706  */
  707 static void
  708 start_init(void *dummy)
  709 {
  710         vm_offset_t addr;
  711         struct execve_args args;
  712         int options, error;
  713         char *var, *path, *next, *s;
  714         char *ucp, **uap, *arg0, *arg1;
  715         struct thread *td;
  716         struct proc *p;
  717 
  718         mtx_lock(&Giant);
  719 
  720         GIANT_REQUIRED;
  721 
  722         td = curthread;
  723         p = td->td_proc;
  724 
  725         vfs_mountroot();
  726 
  727         /* Wipe GELI passphrase from the environment. */
  728         kern_unsetenv("kern.geom.eli.passphrase");
  729 
  730         /*
  731          * Need just enough stack to hold the faked-up "execve()" arguments.
  732          */
  733         addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
  734         if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 0,
  735             VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
  736                 panic("init: couldn't allocate argument space");
  737         p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
  738         p->p_vmspace->vm_ssize = 1;
  739 
  740         if ((var = kern_getenv("init_path")) != NULL) {
  741                 strlcpy(init_path, var, sizeof(init_path));
  742                 freeenv(var);
  743         }
  744         
  745         for (path = init_path; *path != '\0'; path = next) {
  746                 while (*path == ':')
  747                         path++;
  748                 if (*path == '\0')
  749                         break;
  750                 for (next = path; *next != '\0' && *next != ':'; next++)
  751                         /* nothing */ ;
  752                 if (bootverbose)
  753                         printf("start_init: trying %.*s\n", (int)(next - path),
  754                             path);
  755                         
  756                 /*
  757                  * Move out the boot flag argument.
  758                  */
  759                 options = 0;
  760                 ucp = (char *)p->p_sysent->sv_usrstack;
  761                 (void)subyte(--ucp, 0);         /* trailing zero */
  762                 if (boothowto & RB_SINGLE) {
  763                         (void)subyte(--ucp, 's');
  764                         options = 1;
  765                 }
  766 #ifdef notyet
  767                 if (boothowto & RB_FASTBOOT) {
  768                         (void)subyte(--ucp, 'f');
  769                         options = 1;
  770                 }
  771 #endif
  772 
  773 #ifdef BOOTCDROM
  774                 (void)subyte(--ucp, 'C');
  775                 options = 1;
  776 #endif
  777 
  778                 if (options == 0)
  779                         (void)subyte(--ucp, '-');
  780                 (void)subyte(--ucp, '-');               /* leading hyphen */
  781                 arg1 = ucp;
  782 
  783                 /*
  784                  * Move out the file name (also arg 0).
  785                  */
  786                 (void)subyte(--ucp, 0);
  787                 for (s = next - 1; s >= path; s--)
  788                         (void)subyte(--ucp, *s);
  789                 arg0 = ucp;
  790 
  791                 /*
  792                  * Move out the arg pointers.
  793                  */
  794                 uap = (char **)rounddown2((intptr_t)ucp, sizeof(intptr_t));
  795                 (void)suword((caddr_t)--uap, (long)0);  /* terminator */
  796                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
  797                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
  798 
  799                 /*
  800                  * Point at the arguments.
  801                  */
  802                 args.fname = arg0;
  803                 args.argv = uap;
  804                 args.envv = NULL;
  805 
  806                 /*
  807                  * Now try to exec the program.  If can't for any reason
  808                  * other than it doesn't exist, complain.
  809                  *
  810                  * Otherwise, return via fork_trampoline() all the way
  811                  * to user mode as init!
  812                  */
  813                 if ((error = sys_execve(td, &args)) == 0) {
  814                         mtx_unlock(&Giant);
  815                         return;
  816                 }
  817                 if (error != ENOENT)
  818                         printf("exec %.*s: error %d\n", (int)(next - path), 
  819                             path, error);
  820         }
  821         printf("init: not found in path %s\n", init_path);
  822         panic("no init");
  823 }
  824 
  825 /*
  826  * Like kproc_create(), but runs in it's own address space.
  827  * We do this early to reserve pid 1.
  828  *
  829  * Note special case - do not make it runnable yet.  Other work
  830  * in progress will change this more.
  831  */
  832 static void
  833 create_init(const void *udata __unused)
  834 {
  835         struct fork_req fr;
  836         struct ucred *newcred, *oldcred;
  837         struct thread *td;
  838         int error;
  839 
  840         bzero(&fr, sizeof(fr));
  841         fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
  842         fr.fr_procp = &initproc;
  843         error = fork1(&thread0, &fr);
  844         if (error)
  845                 panic("cannot fork init: %d\n", error);
  846         KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
  847         /* divorce init's credentials from the kernel's */
  848         newcred = crget();
  849         sx_xlock(&proctree_lock);
  850         PROC_LOCK(initproc);
  851         initproc->p_flag |= P_SYSTEM | P_INMEM;
  852         initproc->p_treeflag |= P_TREE_REAPER;
  853         LIST_INSERT_HEAD(&initproc->p_reaplist, &proc0, p_reapsibling);
  854         oldcred = initproc->p_ucred;
  855         crcopy(newcred, oldcred);
  856 #ifdef MAC
  857         mac_cred_create_init(newcred);
  858 #endif
  859 #ifdef AUDIT
  860         audit_cred_proc1(newcred);
  861 #endif
  862         proc_set_cred(initproc, newcred);
  863         td = FIRST_THREAD_IN_PROC(initproc);
  864         crfree(td->td_ucred);
  865         td->td_ucred = crhold(initproc->p_ucred);
  866         PROC_UNLOCK(initproc);
  867         sx_xunlock(&proctree_lock);
  868         crfree(oldcred);
  869         cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc),
  870             start_init, NULL);
  871 }
  872 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
  873 
  874 /*
  875  * Make it runnable now.
  876  */
  877 static void
  878 kick_init(const void *udata __unused)
  879 {
  880         struct thread *td;
  881 
  882         td = FIRST_THREAD_IN_PROC(initproc);
  883         thread_lock(td);
  884         TD_SET_CAN_RUN(td);
  885         sched_add(td, SRQ_BORING);
  886         thread_unlock(td);
  887 }
  888 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL);

Cache object: e404dd7bd3b38a0d35f03c22c4a09f13


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.