sys/kern/init_main.c

   1 /*
   2  * Copyright (c) 1995 Terrence R. Lambert
   3  * All rights reserved.
   4  *
   5  * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  * (c) UNIX System Laboratories, Inc.
   8  * All or some portions of this file are derived from material licensed
   9  * to the University of California by American Telephone and Telegraph
  10  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  11  * the permission of UNIX System Laboratories, Inc.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  *
  41  *      @(#)init_main.c 8.9 (Berkeley) 1/21/94
  42  * $FreeBSD: src/sys/kern/init_main.c,v 1.134.2.8 2003/06/06 20:21:32 tegge Exp $
  43  * $DragonFly: src/sys/kern/init_main.c,v 1.87 2008/06/07 11:37:23 mneumann Exp $
  44  */
  45
  46 #include "opt_init_path.h"
  47
  48 #include <sys/param.h>
  49 #include <sys/file.h>
  50 #include <sys/filedesc.h>
  51 #include <sys/kernel.h>
  52 #include <sys/mount.h>
  53 #include <sys/sysctl.h>
  54 #include <sys/proc.h>
  55 #include <sys/resourcevar.h>
  56 #include <sys/signalvar.h>
  57 #include <sys/systm.h>
  58 #include <sys/vnode.h>
  59 #include <sys/sysent.h>
  60 #include <sys/reboot.h>
  61 #include <sys/sysproto.h>
  62 #include <sys/vmmeter.h>
  63 #include <sys/unistd.h>
  64 #include <sys/malloc.h>
  65 #include <sys/machintr.h>
  66 #include <sys/file2.h>
  67 #include <sys/thread2.h>
  68 #include <sys/sysref2.h>
  69 #include <sys/spinlock2.h>
  70
  71 #include <machine/cpu.h>
  72
  73 #include <vm/vm.h>
  74 #include <vm/vm_param.h>
  75 #include <sys/lock.h>
  76 #include <vm/pmap.h>
  77 #include <vm/vm_map.h>
  78 #include <vm/vm_extern.h>
  79 #include <sys/user.h>
  80 #include <sys/copyright.h>
  81
  82 int vfs_mountroot_devfs(void);
  83
  84 /* Components of the first process -- never freed. */
  85 static struct session session0;
  86 static struct pgrp pgrp0;
  87 static struct sigacts sigacts0;
  88 static struct filedesc filedesc0;
  89 static struct plimit limit0;
  90 static struct vmspace vmspace0;
  91 struct proc *initproc;
  92 struct proc proc0;
  93 struct lwp lwp0;
  94 struct thread thread0;
  95
  96 int cmask = CMASK;
  97 extern  struct user *proc0paddr;
  98 extern int fallback_elf_brand;
  99
 100 int     boothowto = 0;          /* initialized so that it can be patched */
 101 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, "");
 102
 103 /*
 104  * This ensures that there is at least one entry so that the sysinit_set
 105  * symbol is not undefined.  A subsystem ID of SI_SPECIAL_DUMMY is never
 106  * executed.
 107  */
 108 SYSINIT(placeholder, SI_SPECIAL_DUMMY, SI_ORDER_ANY, NULL, NULL)
 109
 110 /*
 111  * The sysinit table itself.  Items are checked off as the are run.
 112  * If we want to register new sysinit types, add them to newsysinit.
 113  */
 114 SET_DECLARE(sysinit_set, struct sysinit);
 115 struct sysinit **sysinit, **sysinit_end;
 116 struct sysinit **newsysinit, **newsysinit_end;
 117
 118
 119 /*
 120  * Merge a new sysinit set into the current set, reallocating it if
 121  * necessary.  This can only be called after malloc is running.
 122  */
 123 void
 124 sysinit_add(struct sysinit **set, struct sysinit **set_end)
 125 {
 126         struct sysinit **newset;
 127         struct sysinit **sipp;
 128         struct sysinit **xipp;
 129         int count;
 130
 131         count = set_end - set;
 132         if (newsysinit)
 133                 count += newsysinit_end - newsysinit;
 134         else
 135                 count += sysinit_end - sysinit;
 136         newset = kmalloc(count * sizeof(*sipp), M_TEMP, M_WAITOK);
 137         xipp = newset;
 138         if (newsysinit) {
 139                 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
 140                         *xipp++ = *sipp;
 141         } else {
 142                 for (sipp = sysinit; sipp < sysinit_end; sipp++)
 143                         *xipp++ = *sipp;
 144         }
 145         for (sipp = set; sipp < set_end; sipp++)
 146                 *xipp++ = *sipp;
 147         if (newsysinit)
 148                 kfree(newsysinit, M_TEMP);
 149         newsysinit = newset;
 150         newsysinit_end = newset + count;
 151 }
 152
 153 /*
 154  * Callbacks from machine-dependant startup code (e.g. init386) to set
 155  * up low level entities related to cpu #0's globaldata.
 156  *
 157  * Called from very low level boot code.
 158  */
 159 void
 160 mi_proc0init(struct globaldata *gd, struct user *proc0paddr)
 161 {
 162         lwkt_init_thread(&thread0, proc0paddr, LWKT_THREAD_STACK, 0, gd);
 163         lwkt_set_comm(&thread0, "thread0");
 164         RB_INIT(&proc0.p_lwp_tree);
 165         spin_init(&proc0.p_spin);
 166         proc0.p_lasttid = 0;    /* +1 = next TID */
 167         lwp_rb_tree_RB_INSERT(&proc0.p_lwp_tree, &lwp0);
 168         lwp0.lwp_thread = &thread0;
 169         lwp0.lwp_proc = &proc0;
 170         proc0.p_usched = usched_init();
 171         lwp0.lwp_cpumask = 0xFFFFFFFF;
 172         varsymset_init(&proc0.p_varsymset, NULL);
 173         thread0.td_flags |= TDF_RUNNING;
 174         thread0.td_proc = &proc0;
 175         thread0.td_lwp = &lwp0;
 176         thread0.td_switch = cpu_lwkt_switch;
 177         lwkt_schedule_self(curthread);
 178 }
 179
 180 /*
 181  * System startup; initialize the world, create process 0, mount root
 182  * filesystem, and fork to create init and pagedaemon.  Most of the
 183  * hard work is done in the lower-level initialization routines including
 184  * startup(), which does memory initialization and autoconfiguration.
 185  *
 186  * This allows simple addition of new kernel subsystems that require
 187  * boot time initialization.  It also allows substitution of subsystem
 188  * (for instance, a scheduler, kernel profiler, or VM system) by object
 189  * module.  Finally, it allows for optional "kernel threads".
 190  */
 191 void
 192 mi_startup(void)
 193 {
 194         struct sysinit *sip;            /* system initialization*/
 195         struct sysinit **sipp;          /* system initialization*/
 196         struct sysinit **xipp;          /* interior loop of sort*/
 197         struct sysinit *save;           /* bubble*/
 198
 199         if (sysinit == NULL) {
 200                 sysinit = SET_BEGIN(sysinit_set);
 201                 sysinit_end = SET_LIMIT(sysinit_set);
 202         }
 203
 204 restart:
 205         /*
 206          * Perform a bubble sort of the system initialization objects by
 207          * their subsystem (primary key) and order (secondary key).
 208          */
 209         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
 210                 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
 211                         if ((*sipp)->subsystem < (*xipp)->subsystem ||
 212                              ((*sipp)->subsystem == (*xipp)->subsystem &&
 213                               (*sipp)->order <= (*xipp)->order))
 214                                 continue;       /* skip*/
 215                         save = *sipp;
 216                         *sipp = *xipp;
 217                         *xipp = save;
 218                 }
 219         }
 220
 221         /*
 222          * Traverse the (now) ordered list of system initialization tasks.
 223          * Perform each task, and continue on to the next task.
 224          *
 225          * The last item on the list is expected to be the scheduler,
 226          * which will not return.
 227          */
 228         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
 229                 sip = *sipp;
 230                 if (sip->subsystem == SI_SPECIAL_DUMMY)
 231                         continue;       /* skip dummy task(s)*/
 232
 233                 if (sip->subsystem == SI_SPECIAL_DONE)
 234                         continue;
 235
 236                 /* Call function */
 237                 (*(sip->func))(sip->udata);
 238
 239                 /* Check off the one we're just done */
 240                 sip->subsystem = SI_SPECIAL_DONE;
 241
 242                 /* Check if we've installed more sysinit items via KLD */
 243                 if (newsysinit != NULL) {
 244                         if (sysinit != SET_BEGIN(sysinit_set))
 245                                 kfree(sysinit, M_TEMP);
 246                         sysinit = newsysinit;
 247                         sysinit_end = newsysinit_end;
 248                         newsysinit = NULL;
 249                         newsysinit_end = NULL;
 250                         goto restart;
 251                 }
 252         }
 253
 254         panic("Shouldn't get here!");
 255         /* NOTREACHED*/
 256 }
 257
 258
 259 /*
 260  ***************************************************************************
 261  ****
 262  **** The following SYSINIT's belong elsewhere, but have not yet
 263  **** been moved.
 264  ****
 265  ***************************************************************************
 266  */
 267 static void
 268 print_caddr_t(void *data __unused)
 269 {
 270         kprintf("%s", (char *)data);
 271 }
 272 SYSINIT(announce, SI_BOOT1_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright)
 273
 274 /*
 275  * Leave the critical section that protected us from spurious interrupts
 276  * so device probes work.
 277  */
 278 static void
 279 leavecrit(void *dummy __unused)
 280 {
 281         MachIntrABI.finalize();
 282         cpu_enable_intr();
 283         MachIntrABI.cleanup();
 284         crit_exit();
 285         KKASSERT(!IN_CRITICAL_SECT(curthread));
 286
 287         if (bootverbose)
 288                 kprintf("Leaving critical section, allowing interrupts\n");
 289 }
 290 SYSINIT(leavecrit, SI_BOOT2_LEAVE_CRIT, SI_ORDER_ANY, leavecrit, NULL)
 291
 292 /*
 293  * This is called after the threading system is up and running,
 294  * including the softclock, clock interrupts, and SMP.
 295  */
 296 static void
 297 tsleepworks(void *dummy __unused)
 298 {
 299         tsleep_now_works = 1;
 300 }
 301 SYSINIT(tsleepworks, SI_BOOT2_FINISH_SMP, SI_ORDER_SECOND, tsleepworks, NULL)
 302
 303 /*
 304  * This is called after devices have configured.  Tell the kernel we are
 305  * no longer in cold boot.
 306  */
 307 static void
 308 endofcoldboot(void *dummy __unused)
 309 {
 310         cold = 0;
 311 }
 312 SYSINIT(endofcoldboot, SI_SUB_ISWARM, SI_ORDER_ANY, endofcoldboot, NULL)
 313
 314 /*
 315  ***************************************************************************
 316  ****
 317  **** The two following SYSINT's are proc0 specific glue code.  I am not
 318  **** convinced that they can not be safely combined, but their order of
 319  **** operation has been maintained as the same as the original init_main.c
 320  **** for right now.
 321  ****
 322  **** These probably belong in init_proc.c or kern_proc.c, since they
 323  **** deal with proc0 (the fork template process).
 324  ****
 325  ***************************************************************************
 326  */
 327 /* ARGSUSED*/
 328 static void
 329 proc0_init(void *dummy __unused)
 330 {
 331         struct proc *p;
 332         struct lwp *lp;
 333
 334         p = &proc0;
 335         lp = &lwp0;
 336
 337         /*
 338          * Initialize process and pgrp structures.
 339          */
 340         procinit();
 341
 342         /*
 343          * additional VM structures
 344          */
 345         vm_init2();
 346
 347         /*
 348          * Create process 0 (the swapper).
 349          */
 350         LIST_INSERT_HEAD(&allproc, p, p_list);
 351         p->p_pgrp = &pgrp0;
 352         LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
 353         LIST_INIT(&pgrp0.pg_members);
 354         LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
 355
 356         pgrp0.pg_session = &session0;
 357         session0.s_count = 1;
 358         session0.s_leader = p;
 359
 360         p->p_sysent = &aout_sysvec;
 361
 362         p->p_flag = P_SYSTEM;
 363         p->p_stat = SACTIVE;
 364         lp->lwp_stat = LSRUN;
 365         p->p_nice = NZERO;
 366         p->p_rtprio.type = RTP_PRIO_NORMAL;
 367         p->p_rtprio.prio = 0;
 368         lp->lwp_rtprio = p->p_rtprio;
 369
 370         p->p_peers = 0;
 371         p->p_leader = p;
 372
 373         bcopy("swapper", p->p_comm, sizeof ("swapper"));
 374         bcopy("swapper", thread0.td_comm, sizeof ("swapper"));
 375
 376         /* Create credentials. */
 377         p->p_ucred = crget();
 378         p->p_ucred->cr_ruidinfo = uifind(0);
 379         p->p_ucred->cr_ngroups = 1;     /* group 0 */
 380         p->p_ucred->cr_uidinfo = uifind(0);
 381
 382         /* Don't jail it */
 383         p->p_ucred->cr_prison = NULL;
 384
 385         /* Create sigacts. */
 386         p->p_sigacts = &sigacts0;
 387         p->p_sigacts->ps_refcnt = 1;
 388
 389         /* Initialize signal state for process 0. */
 390         siginit(p);
 391
 392         /* Create the file descriptor table. */
 393         fdinit_bootstrap(p, &filedesc0, cmask);
 394
 395         /* Create the limits structures. */
 396         plimit_init0(&limit0);
 397         p->p_limit = &limit0;
 398
 399         /* Allocate a prototype map so we have something to fork. */
 400         pmap_pinit0(vmspace_pmap(&vmspace0));
 401         p->p_vmspace = &vmspace0;
 402         lp->lwp_vmspace = p->p_vmspace;
 403         sysref_init(&vmspace0.vm_sysref, &vmspace_sysref_class);
 404         vm_map_init(&vmspace0.vm_map,
 405                     round_page(VM_MIN_USER_ADDRESS),
 406                     trunc_page(VM_MAX_USER_ADDRESS),
 407                     vmspace_pmap(&vmspace0));
 408         sysref_activate(&vmspace0.vm_sysref);
 409
 410         /*
 411          * Charge root for one process.
 412          */
 413         (void)chgproccnt(p->p_ucred->cr_uidinfo, 1, 0);
 414         vm_init_limits(p);
 415 }
 416 SYSINIT(p0init, SI_BOOT2_PROC0, SI_ORDER_FIRST, proc0_init, NULL)
 417
 418 static int proc0_post_callback(struct proc *p, void *data __unused);
 419
 420 /* ARGSUSED*/
 421 static void
 422 proc0_post(void *dummy __unused)
 423 {
 424         struct timespec ts;
 425
 426         /*
 427          * Now we can look at the time, having had a chance to verify the
 428          * time from the file system.  Pretend that proc0 started now.
 429          */
 430         allproc_scan(proc0_post_callback, NULL);
 431
 432         /*
 433          * Give the ``random'' number generator a thump.
 434          * XXX: Does read_random() contain enough bits to be used here ?
 435          */
 436         nanotime(&ts);
 437         skrandom(ts.tv_sec ^ ts.tv_nsec);
 438 }
 439
 440 static int
 441 proc0_post_callback(struct proc *p, void *data __unused)
 442 {
 443         microtime(&p->p_start);
 444         return(0);
 445 }
 446
 447 SYSINIT(p0post, SI_SUB_PROC0_POST, SI_ORDER_FIRST, proc0_post, NULL)
 448
 449 /*
 450  ***************************************************************************
 451  ****
 452  **** The following SYSINIT's and glue code should be moved to the
 453  **** respective files on a per subsystem basis.
 454  ****
 455  ***************************************************************************
 456  */
 457
 458
 459 /*
 460  ***************************************************************************
 461  ****
 462  **** The following code probably belongs in another file, like
 463  **** kern/init_init.c.
 464  ****
 465  ***************************************************************************
 466  */
 467
 468 /*
 469  * List of paths to try when searching for "init".
 470  */
 471 static char init_path[MAXPATHLEN] =
 472 #ifdef  INIT_PATH
 473     __XSTRING(INIT_PATH);
 474 #else
 475     "/sbin/init:/sbin/oinit:/sbin/init.bak";
 476 #endif
 477 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, "");
 478
 479 /*
 480  * Start the initial user process; try exec'ing each pathname in init_path.
 481  * The program is invoked with one argument containing the boot flags.
 482  *
 483  * The MP lock is held on entry.
 484  */
 485 static void
 486 start_init(void *dummy, struct trapframe *frame)
 487 {
 488         vm_offset_t addr;
 489         struct execve_args args;
 490         int options, error;
 491         char *var, *path, *next, *s;
 492         char *ucp, **uap, *arg0, *arg1;
 493         struct proc *p;
 494         struct lwp *lp;
 495         struct mount *mp;
 496         struct vnode *vp;
 497
 498         p = curproc;
 499
 500         lp = ONLY_LWP_IN_PROC(p);
 501
 502         /* Get the vnode for '/'.  Set p->p_fd->fd_cdir to reference it. */
 503         mp = mountlist_boot_getfirst();
 504         if (VFS_ROOT(mp, &vp))
 505                 panic("cannot find root vnode");
 506         if (mp->mnt_ncmountpt.ncp == NULL) {
 507                 cache_allocroot(&mp->mnt_ncmountpt, mp, vp);
 508                 cache_unlock(&mp->mnt_ncmountpt);       /* leave ref intact */
 509         }
 510         p->p_fd->fd_cdir = vp;
 511         vref(p->p_fd->fd_cdir);
 512         p->p_fd->fd_rdir = vp;
 513         vref(p->p_fd->fd_rdir);
 514         vfs_cache_setroot(vp, cache_hold(&mp->mnt_ncmountpt));
 515         vn_unlock(vp);                  /* leave ref intact */
 516         cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_ncdir);
 517         cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_nrdir);
 518
 519         kprintf("Mounting devfs\n");
 520         vfs_mountroot_devfs();
 521
 522         /*
 523          * Need just enough stack to hold the faked-up "execve()" arguments.
 524          */
 525         addr = trunc_page(USRSTACK - PAGE_SIZE);
 526         error = vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
 527                             FALSE,
 528                             VM_MAPTYPE_NORMAL,
 529                             VM_PROT_ALL, VM_PROT_ALL,
 530                             0);
 531         if (error)
 532                 panic("init: couldn't allocate argument space");
 533         p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
 534         p->p_vmspace->vm_ssize = 1;
 535
 536         if ((var = kgetenv("init_path")) != NULL) {
 537                 strncpy(init_path, var, sizeof init_path);
 538                 init_path[sizeof init_path - 1] = 0;
 539         }
 540         if ((var = kgetenv("kern.fallback_elf_brand")) != NULL)
 541                 fallback_elf_brand = strtol(var, NULL, 0);
 542
 543         for (path = init_path; *path != '\0'; path = next) {
 544                 while (*path == ':')
 545                         path++;
 546                 if (*path == '\0')
 547                         break;
 548                 for (next = path; *next != '\0' && *next != ':'; next++)
 549                         /* nothing */ ;
 550                 if (bootverbose)
 551                         kprintf("start_init: trying %.*s\n", (int)(next - path),
 552                             path);
 553
 554                 /*
 555                  * Move out the boot flag argument.
 556                  */
 557                 options = 0;
 558                 ucp = (char *)USRSTACK;
 559                 (void)subyte(--ucp, 0);         /* trailing zero */
 560                 if (boothowto & RB_SINGLE) {
 561                         (void)subyte(--ucp, 's');
 562                         options = 1;
 563                 }
 564 #ifdef notyet
 565                 if (boothowto & RB_FASTBOOT) {
 566                         (void)subyte(--ucp, 'f');
 567                         options = 1;
 568                 }
 569 #endif
 570
 571 #ifdef BOOTCDROM
 572                 (void)subyte(--ucp, 'C');
 573                 options = 1;
 574 #endif
 575                 if (options == 0)
 576                         (void)subyte(--ucp, '-');
 577                 (void)subyte(--ucp, '-');               /* leading hyphen */
 578                 arg1 = ucp;
 579
 580                 /*
 581                  * Move out the file name (also arg 0).
 582                  */
 583                 (void)subyte(--ucp, 0);
 584                 for (s = next - 1; s >= path; s--)
 585                         (void)subyte(--ucp, *s);
 586                 arg0 = ucp;
 587
 588                 /*
 589                  * Move out the arg pointers.
 590                  */
 591                 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
 592                 (void)suword((caddr_t)--uap, (long)0);  /* terminator */
 593                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
 594                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
 595
 596                 /*
 597                  * Point at the arguments.
 598                  */
 599                 args.fname = arg0;
 600                 args.argv = uap;
 601                 args.envv = NULL;
 602
 603                 /*
 604                  * Now try to exec the program.  If can't for any reason
 605                  * other than it doesn't exist, complain.
 606                  *
 607                  * Otherwise, return via fork_trampoline() all the way
 608                  * to user mode as init!
 609                  *
 610                  * WARNING!  We may have been moved to another cpu after
 611                  * acquiring the current user process designation.  The
 612                  * MP lock will migrate with us though so we still have to
 613                  * release it.
 614                  */
 615                 if ((error = sys_execve(&args)) == 0) {
 616                         rel_mplock();
 617                         lp->lwp_proc->p_usched->acquire_curproc(lp);
 618                         return;
 619                 }
 620                 if (error != ENOENT)
 621                         kprintf("exec %.*s: error %d\n", (int)(next - path),
 622                             path, error);
 623         }
 624         kprintf("init: not found in path %s\n", init_path);
 625         panic("no init");
 626 }
 627
 628 /*
 629  * Like kthread_create(), but runs in it's own address space.
 630  * We do this early to reserve pid 1.
 631  *
 632  * Note special case - do not make it runnable yet.  Other work
 633  * in progress will change this more.
 634  */
 635 static void
 636 create_init(const void *udata __unused)
 637 {
 638         int error;
 639         struct lwp *lp;
 640
 641         crit_enter();
 642         error = fork1(&lwp0, RFFDG | RFPROC, &initproc);
 643         if (error)
 644                 panic("cannot fork init: %d", error);
 645         initproc->p_flag |= P_SYSTEM;
 646         lp = ONLY_LWP_IN_PROC(initproc);
 647         cpu_set_fork_handler(lp, start_init, NULL);
 648         crit_exit();
 649 }
 650 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL)
 651
 652 /*
 653  * Make it runnable now.
 654  */
 655 static void
 656 kick_init(const void *udata __unused)
 657 {
 658         start_forked_proc(&lwp0, initproc);
 659 }
 660 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL)
 661
 662 /*
 663  * Machine independant globaldata initialization
 664  *
 665  * WARNING!  Called from early boot, 'mycpu' may not work yet.
 666  */
 667 void
 668 mi_gdinit(struct globaldata *gd, int cpuid)
 669 {
 670         TAILQ_INIT(&gd->gd_systimerq);
 671         gd->gd_sysid_alloc = cpuid;     /* prime low bits for cpu lookup */
 672         gd->gd_cpuid = cpuid;
 673         gd->gd_cpumask = (cpumask_t)1 << cpuid;
 674         lwkt_gdinit(gd);
 675         vm_map_entry_reserve_cpu_init(gd);
 676         sleep_gdinit(gd);
 677 }
 678