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. Neither the name of the University nor the names of its contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  *      @(#)init_main.c 8.9 (Berkeley) 1/21/94
   38  * $FreeBSD: src/sys/kern/init_main.c,v 1.134.2.8 2003/06/06 20:21:32 tegge Exp $
   39  */
   40 
   41 #include "opt_init_path.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/file.h>
   45 #include <sys/filedesc.h>
   46 #include <sys/kernel.h>
   47 #include <sys/mount.h>
   48 #include <sys/sysctl.h>
   49 #include <sys/proc.h>
   50 #include <sys/resourcevar.h>
   51 #include <sys/signalvar.h>
   52 #include <sys/systm.h>
   53 #include <sys/vnode.h>
   54 #include <sys/sysent.h>
   55 #include <sys/reboot.h>
   56 #include <sys/sysproto.h>
   57 #include <sys/vmmeter.h>
   58 #include <sys/unistd.h>
   59 #include <sys/malloc.h>
   60 #include <sys/machintr.h>
   61 
   62 #include <sys/refcount.h>
   63 #include <sys/file2.h>
   64 #include <sys/thread2.h>
   65 #include <sys/sysref2.h>
   66 #include <sys/spinlock2.h>
   67 #include <sys/mplock2.h>
   68 
   69 #include <machine/cpu.h>
   70 
   71 #include <vm/vm.h>
   72 #include <vm/vm_param.h>
   73 #include <sys/lock.h>
   74 #include <vm/pmap.h>
   75 #include <vm/vm_map.h>
   76 #include <vm/vm_extern.h>
   77 #include <sys/user.h>
   78 #include <sys/copyright.h>
   79 
   80 int vfs_mountroot_devfs(void);
   81 
   82 /* Components of the first process -- never freed. */
   83 static struct session session0;
   84 static struct pgrp pgrp0;
   85 static struct sigacts sigacts0;
   86 static struct filedesc filedesc0;
   87 static struct plimit limit0;
   88 static struct vmspace vmspace0;
   89 struct proc *initproc;
   90 struct proc proc0;
   91 struct lwp lwp0;
   92 struct thread thread0;
   93 
   94 int cmask = CMASK;
   95 u_int cpu_mi_feature;
   96 cpumask_t usched_global_cpumask;
   97 extern  struct user *proc0paddr;
   98 
   99 int     boothowto = 0;          /* initialized so that it can be patched */
  100 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
  101     "Reboot flags, from console subsystem");
  102 SYSCTL_ULONG(_kern, OID_AUTO, usched_global_cpumask, CTLFLAG_RW,
  103     &usched_global_cpumask, 0, "global user scheduler cpumask");
  104 
  105 /*
  106  * This ensures that there is at least one entry so that the sysinit_set
  107  * symbol is not undefined.  A subsystem ID of SI_SPECIAL_DUMMY is never
  108  * executed.
  109  */
  110 SYSINIT(placeholder, SI_SPECIAL_DUMMY, SI_ORDER_ANY, NULL, NULL)
  111 
  112 /*
  113  * The sysinit table itself.  Items are checked off as the are run.
  114  * If we want to register new sysinit types, add them to newsysinit.
  115  */
  116 SET_DECLARE(sysinit_set, struct sysinit);
  117 struct sysinit **sysinit, **sysinit_end;
  118 struct sysinit **newsysinit, **newsysinit_end;
  119 
  120 
  121 /*
  122  * Merge a new sysinit set into the current set, reallocating it if
  123  * necessary.  This can only be called after malloc is running.
  124  */
  125 void
  126 sysinit_add(struct sysinit **set, struct sysinit **set_end)
  127 {
  128         struct sysinit **newset;
  129         struct sysinit **sipp;
  130         struct sysinit **xipp;
  131         int count;
  132 
  133         count = set_end - set;
  134         if (newsysinit)
  135                 count += newsysinit_end - newsysinit;
  136         else
  137                 count += sysinit_end - sysinit;
  138         newset = kmalloc(count * sizeof(*sipp), M_TEMP, M_WAITOK);
  139         xipp = newset;
  140         if (newsysinit) {
  141                 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
  142                         *xipp++ = *sipp;
  143         } else {
  144                 for (sipp = sysinit; sipp < sysinit_end; sipp++)
  145                         *xipp++ = *sipp;
  146         }
  147         for (sipp = set; sipp < set_end; sipp++)
  148                 *xipp++ = *sipp;
  149         if (newsysinit)
  150                 kfree(newsysinit, M_TEMP);
  151         newsysinit = newset;
  152         newsysinit_end = newset + count;
  153 }
  154 
  155 /*
  156  * Callbacks from machine-dependant startup code (e.g. init386) to set
  157  * up low level entities related to cpu #0's globaldata.
  158  *
  159  * Called from very low level boot code.
  160  */
  161 void
  162 mi_proc0init(struct globaldata *gd, struct user *proc0paddr)
  163 {
  164         lwkt_init_thread(&thread0, proc0paddr, LWKT_THREAD_STACK, 0, gd);
  165         lwkt_set_comm(&thread0, "thread0");
  166         RB_INIT(&proc0.p_lwp_tree);
  167         spin_init(&proc0.p_spin);
  168         lwkt_token_init(&proc0.p_token, "iproc");
  169         proc0.p_lasttid = 0;    /* +1 = next TID */
  170         lwp_rb_tree_RB_INSERT(&proc0.p_lwp_tree, &lwp0);
  171         lwp0.lwp_thread = &thread0;
  172         lwp0.lwp_proc = &proc0;
  173         proc0.p_usched = usched_init();
  174         lwp0.lwp_cpumask = (cpumask_t)-1;
  175         lwkt_token_init(&lwp0.lwp_token, "lwp_token");
  176         spin_init(&lwp0.lwp_spin);
  177         varsymset_init(&proc0.p_varsymset, NULL);
  178         thread0.td_flags |= TDF_RUNNING;
  179         thread0.td_proc = &proc0;
  180         thread0.td_lwp = &lwp0;
  181         thread0.td_switch = cpu_lwkt_switch;
  182         lwkt_schedule_self(curthread);
  183 }
  184 
  185 /*
  186  * System startup; initialize the world, create process 0, mount root
  187  * filesystem, and fork to create init and pagedaemon.  Most of the
  188  * hard work is done in the lower-level initialization routines including
  189  * startup(), which does memory initialization and autoconfiguration.
  190  *
  191  * This allows simple addition of new kernel subsystems that require
  192  * boot time initialization.  It also allows substitution of subsystem
  193  * (for instance, a scheduler, kernel profiler, or VM system) by object
  194  * module.  Finally, it allows for optional "kernel threads".
  195  */
  196 void
  197 mi_startup(void)
  198 {
  199         struct sysinit *sip;            /* system initialization*/
  200         struct sysinit **sipp;          /* system initialization*/
  201         struct sysinit **xipp;          /* interior loop of sort*/
  202         struct sysinit *save;           /* bubble*/
  203 
  204         if (sysinit == NULL) {
  205                 sysinit = SET_BEGIN(sysinit_set);
  206 #if defined(__x86_64__) && defined(_KERNEL_VIRTUAL)
  207                 /*
  208                  * XXX For whatever reason, on 64-bit vkernels
  209                  * the value of sysinit obtained from the
  210                  * linker set is wrong.
  211                  */
  212                 if ((long)sysinit % 8 != 0) {
  213                         kprintf("Fixing sysinit value...\n");
  214                         sysinit = (void *)((long)(intptr_t)sysinit + 4);
  215                 }
  216 #endif
  217                 sysinit_end = SET_LIMIT(sysinit_set);
  218         }
  219 #if defined(__x86_64__) && defined(_KERNEL_VIRTUAL)
  220         KKASSERT((long)sysinit % 8 == 0);
  221 #endif
  222 
  223 restart:
  224         /*
  225          * Perform a bubble sort of the system initialization objects by
  226          * their subsystem (primary key) and order (secondary key).
  227          */
  228         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
  229                 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
  230                         if ((*sipp)->subsystem < (*xipp)->subsystem ||
  231                              ((*sipp)->subsystem == (*xipp)->subsystem &&
  232                               (*sipp)->order <= (*xipp)->order))
  233                                 continue;       /* skip*/
  234                         save = *sipp;
  235                         *sipp = *xipp;
  236                         *xipp = save;
  237                 }
  238         }
  239 
  240         /*
  241          * Traverse the (now) ordered list of system initialization tasks.
  242          * Perform each task, and continue on to the next task.
  243          *
  244          * The last item on the list is expected to be the scheduler,
  245          * which will not return.
  246          */
  247         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
  248                 sip = *sipp;
  249                 if (sip->subsystem == SI_SPECIAL_DUMMY)
  250                         continue;       /* skip dummy task(s)*/
  251 
  252                 if (sip->subsystem == SI_SPECIAL_DONE)
  253                         continue;
  254 
  255                 /* Call function */
  256                 (*(sip->func))(sip->udata);
  257 
  258                 /* Check off the one we're just done */
  259                 sip->subsystem = SI_SPECIAL_DONE;
  260 
  261                 /* Check if we've installed more sysinit items via KLD */
  262                 if (newsysinit != NULL) {
  263                         if (sysinit != SET_BEGIN(sysinit_set))
  264                                 kfree(sysinit, M_TEMP);
  265                         sysinit = newsysinit;
  266                         sysinit_end = newsysinit_end;
  267                         newsysinit = NULL;
  268                         newsysinit_end = NULL;
  269                         goto restart;
  270                 }
  271         }
  272 
  273         panic("Shouldn't get here!");
  274         /* NOTREACHED*/
  275 }
  276 
  277 
  278 /*
  279  ***************************************************************************
  280  ****
  281  **** The following SYSINIT's belong elsewhere, but have not yet
  282  **** been moved.
  283  ****
  284  ***************************************************************************
  285  */
  286 static void
  287 print_caddr_t(void *data)
  288 {
  289         kprintf("%s", (char *)data);
  290 }
  291 SYSINIT(announce, SI_BOOT1_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright)
  292 
  293 /*
  294  * Leave the critical section that protected us from spurious interrupts
  295  * so device probes work.
  296  */
  297 static void
  298 leavecrit(void *dummy __unused)
  299 {
  300         MachIntrABI.stabilize();
  301         cpu_enable_intr();
  302         MachIntrABI.cleanup();
  303         crit_exit();
  304         KKASSERT(!IN_CRITICAL_SECT(curthread));
  305 
  306         if (bootverbose)
  307                 kprintf("Leaving critical section, allowing interrupts\n");
  308 }
  309 SYSINIT(leavecrit, SI_BOOT2_LEAVE_CRIT, SI_ORDER_ANY, leavecrit, NULL)
  310 
  311 /*
  312  * This is called after the threading system is up and running,
  313  * including the softclock, clock interrupts, and SMP.
  314  */
  315 static void
  316 tsleepworks(void *dummy __unused)
  317 {
  318         tsleep_now_works = 1;
  319 }
  320 SYSINIT(tsleepworks, SI_BOOT2_FINISH_SMP, SI_ORDER_SECOND, tsleepworks, NULL)
  321 
  322 /*
  323  * This is called after devices have configured.  Tell the kernel we are
  324  * no longer in cold boot.
  325  */
  326 static void
  327 endofcoldboot(void *dummy __unused)
  328 {
  329         cold = 0;
  330 }
  331 SYSINIT(endofcoldboot, SI_SUB_ISWARM, SI_ORDER_ANY, endofcoldboot, NULL)
  332 
  333 /*
  334  ***************************************************************************
  335  ****
  336  **** The two following SYSINT's are proc0 specific glue code.  I am not
  337  **** convinced that they can not be safely combined, but their order of
  338  **** operation has been maintained as the same as the original init_main.c
  339  **** for right now.
  340  ****
  341  **** These probably belong in init_proc.c or kern_proc.c, since they
  342  **** deal with proc0 (the fork template process).
  343  ****
  344  ***************************************************************************
  345  */
  346 /* ARGSUSED*/
  347 static void
  348 proc0_init(void *dummy __unused)
  349 {
  350         struct proc *p;
  351         struct lwp *lp;
  352 
  353         p = &proc0;
  354         lp = &lwp0;
  355 
  356         /*
  357          * Initialize osrel
  358          */
  359         p->p_osrel = osreldate;
  360 
  361         /*
  362          * Initialize process and pgrp structures.
  363          */
  364         procinit();
  365 
  366         /*
  367          * additional VM structures
  368          */
  369         vm_init2();
  370 
  371         /*
  372          * Create process 0 (the swapper).
  373          */
  374         procinsertinit(p);
  375         pgrpinsertinit(&pgrp0);
  376         LIST_INIT(&pgrp0.pg_members);
  377         lwkt_token_init(&pgrp0.pg_token, "pgrp0");
  378         refcount_init(&pgrp0.pg_refs, 1);
  379         lockinit(&pgrp0.pg_lock, "pgwt0", 0, 0);
  380         LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
  381 
  382         pgrp0.pg_session = &session0;
  383         session0.s_count = 1;
  384         session0.s_leader = p;
  385         sessinsertinit(&session0);
  386 
  387         pgref(&pgrp0);
  388         p->p_pgrp = &pgrp0;
  389 
  390         p->p_sysent = &aout_sysvec;
  391 
  392         p->p_flags = P_SYSTEM;
  393         p->p_stat = SACTIVE;
  394         lp->lwp_stat = LSRUN;
  395         p->p_nice = NZERO;
  396         p->p_rtprio.type = RTP_PRIO_NORMAL;
  397         p->p_rtprio.prio = 0;
  398         lp->lwp_rtprio = p->p_rtprio;
  399 
  400         p->p_peers = NULL;
  401         p->p_leader = p;
  402 
  403         bcopy("swapper", p->p_comm, sizeof ("swapper"));
  404         bcopy("swapper", thread0.td_comm, sizeof ("swapper"));
  405 
  406         /* Create credentials. */
  407         p->p_ucred = crget();
  408         p->p_ucred->cr_ruidinfo = uifind(0);
  409         p->p_ucred->cr_ngroups = 1;     /* group 0 */
  410         p->p_ucred->cr_uidinfo = uifind(0);
  411         thread0.td_ucred = crhold(p->p_ucred);  /* bootstrap fork1() */
  412 
  413         /* Don't jail it */
  414         p->p_ucred->cr_prison = NULL;
  415 
  416         /* Create sigacts. */
  417         p->p_sigacts = &sigacts0;
  418         refcount_init(&p->p_sigacts->ps_refcnt, 1);
  419 
  420         /* Initialize signal state for process 0. */
  421         siginit(p);
  422 
  423         /* Create the file descriptor table. */
  424         fdinit_bootstrap(p, &filedesc0, cmask);
  425 
  426         /* Create the limits structures. */
  427         plimit_init0(&limit0);
  428         p->p_limit = &limit0;
  429 
  430         /* Allocate a prototype map so we have something to fork. */
  431         pmap_pinit0(vmspace_pmap(&vmspace0));
  432         p->p_vmspace = &vmspace0;
  433         lp->lwp_vmspace = p->p_vmspace;
  434         sysref_init(&vmspace0.vm_sysref, &vmspace_sysref_class);
  435         vm_map_init(&vmspace0.vm_map,
  436                     round_page(VM_MIN_USER_ADDRESS),
  437                     trunc_page(VM_MAX_USER_ADDRESS),
  438                     vmspace_pmap(&vmspace0));
  439         sysref_activate(&vmspace0.vm_sysref);
  440 
  441         kqueue_init(&lwp0.lwp_kqueue, &filedesc0);
  442 
  443         /*
  444          * Charge root for one process.
  445          */
  446         (void)chgproccnt(p->p_ucred->cr_uidinfo, 1, 0);
  447         vm_init_limits(p);
  448 }
  449 SYSINIT(p0init, SI_BOOT2_PROC0, SI_ORDER_FIRST, proc0_init, NULL)
  450 
  451 static int proc0_post_callback(struct proc *p, void *data __unused);
  452 
  453 /* ARGSUSED*/
  454 static void
  455 proc0_post(void *dummy __unused)
  456 {
  457         struct timespec ts;
  458 
  459         /*
  460          * Now we can look at the time, having had a chance to verify the
  461          * time from the file system.  Pretend that proc0 started now.
  462          */
  463         allproc_scan(proc0_post_callback, NULL);
  464 
  465         /*
  466          * Give the ``random'' number generator a thump.
  467          * XXX: Does read_random() contain enough bits to be used here ?
  468          */
  469         nanotime(&ts);
  470         skrandom(ts.tv_sec ^ ts.tv_nsec);
  471 }
  472 
  473 static int
  474 proc0_post_callback(struct proc *p, void *data __unused)
  475 {
  476         microtime(&p->p_start);
  477         return(0);
  478 }
  479 
  480 SYSINIT(p0post, SI_SUB_PROC0_POST, SI_ORDER_FIRST, proc0_post, NULL)
  481 
  482 /*
  483  ***************************************************************************
  484  ****
  485  **** The following SYSINIT's and glue code should be moved to the
  486  **** respective files on a per subsystem basis.
  487  ****
  488  ***************************************************************************
  489  */
  490 
  491 
  492 /*
  493  ***************************************************************************
  494  ****
  495  **** The following code probably belongs in another file, like
  496  **** kern/init_init.c.
  497  ****
  498  ***************************************************************************
  499  */
  500 
  501 /*
  502  * List of paths to try when searching for "init".
  503  */
  504 static char init_path[MAXPATHLEN] =
  505 #ifdef  INIT_PATH
  506     __XSTRING(INIT_PATH);
  507 #else
  508     "/sbin/init:/sbin/oinit:/sbin/init.bak";
  509 #endif
  510 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, "");
  511 
  512 /*
  513  * Shutdown timeout of init(8).
  514  * Unused within kernel, but used to control init(8), hence do not remove.
  515  */
  516 #ifndef INIT_SHUTDOWN_TIMEOUT
  517 #define INIT_SHUTDOWN_TIMEOUT 120
  518 #endif
  519 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
  520 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
  521         CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
  522         "Unused within kernel, but used to control init(8)");
  523 
  524 /*
  525  * Start the initial user process; try exec'ing each pathname in init_path.
  526  * The program is invoked with one argument containing the boot flags.
  527  */
  528 static void
  529 start_init(void *dummy, struct trapframe *frame)
  530 {
  531         vm_offset_t addr;
  532         struct execve_args args;
  533         int options, error;
  534         char *var, *path, *next, *s;
  535         char *ucp, **uap, *arg0, *arg1;
  536         struct proc *p;
  537         struct lwp *lp;
  538         struct mount *mp;
  539         struct vnode *vp;
  540         char *env;
  541 
  542         /*
  543          * This is passed in by the bootloader
  544          */
  545         env = kgetenv("kernelname");
  546         if (env != NULL)
  547                 strlcpy(kernelname, env, sizeof(kernelname));
  548 
  549         /*
  550          * The MP lock is not held on entry.  We release it before
  551          * returning to userland.
  552          */
  553         get_mplock();
  554         p = curproc;
  555 
  556         lp = ONLY_LWP_IN_PROC(p);
  557 
  558         /* Get the vnode for '/'.  Set p->p_fd->fd_cdir to reference it. */
  559         mp = mountlist_boot_getfirst();
  560         if (VFS_ROOT(mp, &vp))
  561                 panic("cannot find root vnode");
  562         if (mp->mnt_ncmountpt.ncp == NULL) {
  563                 cache_allocroot(&mp->mnt_ncmountpt, mp, vp);
  564                 cache_unlock(&mp->mnt_ncmountpt);       /* leave ref intact */
  565         }
  566         p->p_fd->fd_cdir = vp;
  567         vref(p->p_fd->fd_cdir);
  568         p->p_fd->fd_rdir = vp;
  569         vref(p->p_fd->fd_rdir);
  570         vfs_cache_setroot(vp, cache_hold(&mp->mnt_ncmountpt));
  571         vn_unlock(vp);                  /* leave ref intact */
  572         cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_ncdir);
  573         cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_nrdir);
  574 
  575         kprintf("Mounting devfs\n");
  576         vfs_mountroot_devfs();
  577 
  578         /*
  579          * Need just enough stack to hold the faked-up "execve()" arguments.
  580          */
  581         addr = trunc_page(USRSTACK - PAGE_SIZE);
  582         error = vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr,
  583                             PAGE_SIZE, PAGE_SIZE,
  584                             FALSE, VM_MAPTYPE_NORMAL,
  585                             VM_PROT_ALL, VM_PROT_ALL,
  586                             0);
  587         if (error)
  588                 panic("init: couldn't allocate argument space");
  589         p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
  590         p->p_vmspace->vm_ssize = 1;
  591 
  592         if ((var = kgetenv("init_path")) != NULL) {
  593                 strncpy(init_path, var, sizeof init_path);
  594                 init_path[sizeof init_path - 1] = 0;
  595         }
  596 
  597         for (path = init_path; *path != '\0'; path = next) {
  598                 while (*path == ':')
  599                         path++;
  600                 if (*path == '\0')
  601                         break;
  602                 for (next = path; *next != '\0' && *next != ':'; next++)
  603                         /* nothing */ ;
  604                 if (bootverbose)
  605                         kprintf("start_init: trying %.*s\n", (int)(next - path),
  606                             path);
  607                         
  608                 /*
  609                  * Move out the boot flag argument.
  610                  */
  611                 options = 0;
  612                 ucp = (char *)USRSTACK;
  613                 (void)subyte(--ucp, 0);         /* trailing zero */
  614                 if (boothowto & RB_SINGLE) {
  615                         (void)subyte(--ucp, 's');
  616                         options = 1;
  617                 }
  618 #ifdef notyet
  619                 if (boothowto & RB_FASTBOOT) {
  620                         (void)subyte(--ucp, 'f');
  621                         options = 1;
  622                 }
  623 #endif
  624 
  625 #ifdef BOOTCDROM
  626                 (void)subyte(--ucp, 'C');
  627                 options = 1;
  628 #endif
  629                 if (options == 0)
  630                         (void)subyte(--ucp, '-');
  631                 (void)subyte(--ucp, '-');               /* leading hyphen */
  632                 arg1 = ucp;
  633 
  634                 /*
  635                  * Move out the file name (also arg 0).
  636                  */
  637                 (void)subyte(--ucp, 0);
  638                 for (s = next - 1; s >= path; s--)
  639                         (void)subyte(--ucp, *s);
  640                 arg0 = ucp;
  641 
  642                 /*
  643                  * Move out the arg pointers.
  644                  */
  645                 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
  646                 (void)suword((caddr_t)--uap, (long)0);  /* terminator */
  647                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
  648                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
  649 
  650                 /*
  651                  * Point at the arguments.
  652                  */
  653                 args.fname = arg0;
  654                 args.argv = uap;
  655                 args.envv = NULL;
  656 
  657                 /*
  658                  * Now try to exec the program.  If can't for any reason
  659                  * other than it doesn't exist, complain.
  660                  *
  661                  * Otherwise, return via fork_trampoline() all the way
  662                  * to user mode as init!
  663                  *
  664                  * WARNING!  We may have been moved to another cpu after
  665                  * acquiring the current user process designation.  The
  666                  * MP lock will migrate with us though so we still have to
  667                  * release it.
  668                  */
  669                 if ((error = sys_execve(&args)) == 0) {
  670                         rel_mplock();
  671                         lp->lwp_proc->p_usched->acquire_curproc(lp);
  672                         return;
  673                 }
  674                 if (error != ENOENT)
  675                         kprintf("exec %.*s: error %d\n", (int)(next - path), 
  676                             path, error);
  677         }
  678         kprintf("init: not found in path %s\n", init_path);
  679         panic("no init");
  680 }
  681 
  682 /*
  683  * Like kthread_create(), but runs in it's own address space.
  684  * We do this early to reserve pid 1.
  685  *
  686  * Note special case - do not make it runnable yet.  Other work
  687  * in progress will change this more.
  688  */
  689 static void
  690 create_init(const void *udata __unused)
  691 {
  692         int error;
  693         struct lwp *lp;
  694 
  695         crit_enter();
  696         error = fork1(&lwp0, RFFDG | RFPROC, &initproc);
  697         if (error)
  698                 panic("cannot fork init: %d", error);
  699         initproc->p_flags |= P_SYSTEM;
  700         lp = ONLY_LWP_IN_PROC(initproc);
  701         cpu_set_fork_handler(lp, start_init, NULL);
  702         crit_exit();
  703 }
  704 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL)
  705 
  706 /*
  707  * Make it runnable now.
  708  */
  709 static void
  710 kick_init(const void *udata __unused)
  711 {
  712         start_forked_proc(&lwp0, initproc);
  713 }
  714 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL)
  715 
  716 /*
  717  * Machine independant globaldata initialization
  718  *
  719  * WARNING!  Called from early boot, 'mycpu' may not work yet.
  720  */
  721 void
  722 mi_gdinit(struct globaldata *gd, int cpuid)
  723 {
  724         TAILQ_INIT(&gd->gd_systimerq);
  725         gd->gd_sysid_alloc = cpuid;     /* prime low bits for cpu lookup */
  726         gd->gd_cpuid = cpuid;
  727         gd->gd_cpumask = CPUMASK(cpuid);
  728         lwkt_gdinit(gd);
  729         vm_map_entry_reserve_cpu_init(gd);
  730         sleep_gdinit(gd);
  731         atomic_set_cpumask(&usched_global_cpumask, CPUMASK(cpuid));
  732 }
  733 

Cache object: 9c41f9a8c5324367631a59fed078caff


[ 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.