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
  67 #include <sys/file2.h>
  68 #include <sys/thread2.h>
  69 #include <sys/sysref2.h>
  70 #include <sys/spinlock2.h>
  71 #include <sys/mplock2.h>
  72
  73 #include <machine/cpu.h>
  74
  75 #include <vm/vm.h>
  76 #include <vm/vm_param.h>
  77 #include <sys/lock.h>
  78 #include <vm/pmap.h>
  79 #include <vm/vm_map.h>
  80 #include <vm/vm_extern.h>
  81 #include <sys/user.h>
  82 #include <sys/copyright.h>
  83
  84 int vfs_mountroot_devfs(void);
  85
  86 /* Components of the first process -- never freed. */
  87 static struct session session0;
  88 static struct pgrp pgrp0;
  89 static struct sigacts sigacts0;
  90 static struct filedesc filedesc0;
  91 static struct plimit limit0;
  92 static struct vmspace vmspace0;
  93 struct proc *initproc;
  94 struct proc proc0;
  95 struct lwp lwp0;
  96 struct thread thread0;
  97
  98 int cmask = CMASK;
  99 extern  struct user *proc0paddr;
 100 extern int fallback_elf_brand;
 101
 102 int     boothowto = 0;          /* initialized so that it can be patched */
 103 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, "");
 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         proc0.p_lasttid = 0;    /* +1 = next TID */
 169         lwp_rb_tree_RB_INSERT(&proc0.p_lwp_tree, &lwp0);
 170         lwp0.lwp_thread = &thread0;
 171         lwp0.lwp_proc = &proc0;
 172         proc0.p_usched = usched_init();
 173         lwp0.lwp_cpumask = 0xFFFFFFFF;
 174         varsymset_init(&proc0.p_varsymset, NULL);
 175         thread0.td_flags |= TDF_RUNNING;
 176         thread0.td_proc = &proc0;
 177         thread0.td_lwp = &lwp0;
 178         thread0.td_switch = cpu_lwkt_switch;
 179         lwkt_schedule_self(curthread);
 180 }
 181
 182 /*
 183  * System startup; initialize the world, create process 0, mount root
 184  * filesystem, and fork to create init and pagedaemon.  Most of the
 185  * hard work is done in the lower-level initialization routines including
 186  * startup(), which does memory initialization and autoconfiguration.
 187  *
 188  * This allows simple addition of new kernel subsystems that require
 189  * boot time initialization.  It also allows substitution of subsystem
 190  * (for instance, a scheduler, kernel profiler, or VM system) by object
 191  * module.  Finally, it allows for optional "kernel threads".
 192  */
 193 void
 194 mi_startup(void)
 195 {
 196         struct sysinit *sip;            /* system initialization*/
 197         struct sysinit **sipp;          /* system initialization*/
 198         struct sysinit **xipp;          /* interior loop of sort*/
 199         struct sysinit *save;           /* bubble*/
 200
 201         if (sysinit == NULL) {
 202                 sysinit = SET_BEGIN(sysinit_set);
 203                 sysinit_end = SET_LIMIT(sysinit_set);
 204         }
 205
 206 restart:
 207         /*
 208          * Perform a bubble sort of the system initialization objects by
 209          * their subsystem (primary key) and order (secondary key).
 210          */
 211         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
 212                 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
 213                         if ((*sipp)->subsystem < (*xipp)->subsystem ||
 214                              ((*sipp)->subsystem == (*xipp)->subsystem &&
 215                               (*sipp)->order <= (*xipp)->order))
 216                                 continue;       /* skip*/
 217                         save = *sipp;
 218                         *sipp = *xipp;
 219                         *xipp = save;
 220                 }
 221         }
 222
 223         /*
 224          * Traverse the (now) ordered list of system initialization tasks.
 225          * Perform each task, and continue on to the next task.
 226          *
 227          * The last item on the list is expected to be the scheduler,
 228          * which will not return.
 229          */
 230         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
 231                 sip = *sipp;
 232                 if (sip->subsystem == SI_SPECIAL_DUMMY)
 233                         continue;       /* skip dummy task(s)*/
 234
 235                 if (sip->subsystem == SI_SPECIAL_DONE)
 236                         continue;
 237
 238                 /* Call function */
 239                 (*(sip->func))(sip->udata);
 240
 241                 /* Check off the one we're just done */
 242                 sip->subsystem = SI_SPECIAL_DONE;
 243
 244                 /* Check if we've installed more sysinit items via KLD */
 245                 if (newsysinit != NULL) {
 246                         if (sysinit != SET_BEGIN(sysinit_set))
 247                                 kfree(sysinit, M_TEMP);
 248                         sysinit = newsysinit;
 249                         sysinit_end = newsysinit_end;
 250                         newsysinit = NULL;
 251                         newsysinit_end = NULL;
 252                         goto restart;
 253                 }
 254         }
 255
 256         panic("Shouldn't get here!");
 257         /* NOTREACHED*/
 258 }
 259
 260
 261 /*
 262  ***************************************************************************
 263  ****
 264  **** The following SYSINIT's belong elsewhere, but have not yet
 265  **** been moved.
 266  ****
 267  ***************************************************************************
 268  */
 269 static void
 270 print_caddr_t(void *data __unused)
 271 {
 272         kprintf("%s", (char *)data);
 273 }
 274 SYSINIT(announce, SI_BOOT1_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright)
 275
 276 /*
 277  * Leave the critical section that protected us from spurious interrupts
 278  * so device probes work.
 279  */
 280 static void
 281 leavecrit(void *dummy __unused)
 282 {
 283         MachIntrABI.finalize();
 284         cpu_enable_intr();
 285         MachIntrABI.cleanup();
 286         crit_exit();
 287         KKASSERT(!IN_CRITICAL_SECT(curthread));
 288
 289         if (bootverbose)
 290                 kprintf("Leaving critical section, allowing interrupts\n");
 291 }
 292 SYSINIT(leavecrit, SI_BOOT2_LEAVE_CRIT, SI_ORDER_ANY, leavecrit, NULL)
 293
 294 /*
 295  * This is called after the threading system is up and running,
 296  * including the softclock, clock interrupts, and SMP.
 297  */
 298 static void
 299 tsleepworks(void *dummy __unused)
 300 {
 301         tsleep_now_works = 1;
 302 }
 303 SYSINIT(tsleepworks, SI_BOOT2_FINISH_SMP, SI_ORDER_SECOND, tsleepworks, NULL)
 304
 305 /*
 306  * This is called after devices have configured.  Tell the kernel we are
 307  * no longer in cold boot.
 308  */
 309 static void
 310 endofcoldboot(void *dummy __unused)
 311 {
 312         cold = 0;
 313 }
 314 SYSINIT(endofcoldboot, SI_SUB_ISWARM, SI_ORDER_ANY, endofcoldboot, NULL)
 315
 316 /*
 317  ***************************************************************************
 318  ****
 319  **** The two following SYSINT's are proc0 specific glue code.  I am not
 320  **** convinced that they can not be safely combined, but their order of
 321  **** operation has been maintained as the same as the original init_main.c
 322  **** for right now.
 323  ****
 324  **** These probably belong in init_proc.c or kern_proc.c, since they
 325  **** deal with proc0 (the fork template process).
 326  ****
 327  ***************************************************************************
 328  */
 329 /* ARGSUSED*/
 330 static void
 331 proc0_init(void *dummy __unused)
 332 {
 333         struct proc *p;
 334         struct lwp *lp;
 335
 336         p = &proc0;
 337         lp = &lwp0;
 338
 339         /*
 340          * Initialize process and pgrp structures.
 341          */
 342         procinit();
 343
 344         /*
 345          * additional VM structures
 346          */
 347         vm_init2();
 348
 349         /*
 350          * Create process 0 (the swapper).
 351          */
 352         LIST_INSERT_HEAD(&allproc, p, p_list);
 353         p->p_pgrp = &pgrp0;
 354         LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
 355         LIST_INIT(&pgrp0.pg_members);
 356         LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
 357
 358         pgrp0.pg_session = &session0;
 359         session0.s_count = 1;
 360         session0.s_leader = p;
 361
 362         p->p_sysent = &aout_sysvec;
 363
 364         p->p_flag = P_SYSTEM;
 365         p->p_stat = SACTIVE;
 366         lp->lwp_stat = LSRUN;
 367         p->p_nice = NZERO;
 368         p->p_rtprio.type = RTP_PRIO_NORMAL;
 369         p->p_rtprio.prio = 0;
 370         lp->lwp_rtprio = p->p_rtprio;
 371
 372         p->p_peers = 0;
 373         p->p_leader = p;
 374
 375         bcopy("swapper", p->p_comm, sizeof ("swapper"));
 376         bcopy("swapper", thread0.td_comm, sizeof ("swapper"));
 377
 378         /* Create credentials. */
 379         p->p_ucred = crget();
 380         p->p_ucred->cr_ruidinfo = uifind(0);
 381         p->p_ucred->cr_ngroups = 1;     /* group 0 */
 382         p->p_ucred->cr_uidinfo = uifind(0);
 383         thread0.td_ucred = crhold(p->p_ucred);  /* bootstrap fork1() */
 384
 385         /* Don't jail it */
 386         p->p_ucred->cr_prison = NULL;
 387
 388         /* Create sigacts. */
 389         p->p_sigacts = &sigacts0;
 390         p->p_sigacts->ps_refcnt = 1;
 391
 392         /* Initialize signal state for process 0. */
 393         siginit(p);
 394
 395         /* Create the file descriptor table. */
 396         fdinit_bootstrap(p, &filedesc0, cmask);
 397
 398         /* Create the limits structures. */
 399         plimit_init0(&limit0);
 400         p->p_limit = &limit0;
 401
 402         /* Allocate a prototype map so we have something to fork. */
 403         pmap_pinit0(vmspace_pmap(&vmspace0));
 404         p->p_vmspace = &vmspace0;
 405         lp->lwp_vmspace = p->p_vmspace;
 406         sysref_init(&vmspace0.vm_sysref, &vmspace_sysref_class);
 407         vm_map_init(&vmspace0.vm_map,
 408                     round_page(VM_MIN_USER_ADDRESS),
 409                     trunc_page(VM_MAX_USER_ADDRESS),
 410                     vmspace_pmap(&vmspace0));
 411         sysref_activate(&vmspace0.vm_sysref);
 412
 413         kqueue_init(&lwp0.lwp_kqueue, &filedesc0);
 414
 415         /*
 416          * Charge root for one process.
 417          */
 418         (void)chgproccnt(p->p_ucred->cr_uidinfo, 1, 0);
 419         vm_init_limits(p);
 420 }
 421 SYSINIT(p0init, SI_BOOT2_PROC0, SI_ORDER_FIRST, proc0_init, NULL)
 422
 423 static int proc0_post_callback(struct proc *p, void *data __unused);
 424
 425 /* ARGSUSED*/
 426 static void
 427 proc0_post(void *dummy __unused)
 428 {
 429         struct timespec ts;
 430
 431         /*
 432          * Now we can look at the time, having had a chance to verify the
 433          * time from the file system.  Pretend that proc0 started now.
 434          */
 435         allproc_scan(proc0_post_callback, NULL);
 436
 437         /*
 438          * Give the ``random'' number generator a thump.
 439          * XXX: Does read_random() contain enough bits to be used here ?
 440          */
 441         nanotime(&ts);
 442         skrandom(ts.tv_sec ^ ts.tv_nsec);
 443 }
 444
 445 static int
 446 proc0_post_callback(struct proc *p, void *data __unused)
 447 {
 448         microtime(&p->p_start);
 449         return(0);
 450 }
 451
 452 SYSINIT(p0post, SI_SUB_PROC0_POST, SI_ORDER_FIRST, proc0_post, NULL)
 453
 454 /*
 455  ***************************************************************************
 456  ****
 457  **** The following SYSINIT's and glue code should be moved to the
 458  **** respective files on a per subsystem basis.
 459  ****
 460  ***************************************************************************
 461  */
 462
 463
 464 /*
 465  ***************************************************************************
 466  ****
 467  **** The following code probably belongs in another file, like
 468  **** kern/init_init.c.
 469  ****
 470  ***************************************************************************
 471  */
 472
 473 /*
 474  * List of paths to try when searching for "init".
 475  */
 476 static char init_path[MAXPATHLEN] =
 477 #ifdef  INIT_PATH
 478     __XSTRING(INIT_PATH);
 479 #else
 480     "/sbin/init:/sbin/oinit:/sbin/init.bak";
 481 #endif
 482 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, "");
 483
 484 /*
 485  * Start the initial user process; try exec'ing each pathname in init_path.
 486  * The program is invoked with one argument containing the boot flags.
 487  *
 488  * The MP lock is held on entry.
 489  */
 490 static void
 491 start_init(void *dummy, struct trapframe *frame)
 492 {
 493         vm_offset_t addr;
 494         struct execve_args args;
 495         int options, error;
 496         char *var, *path, *next, *s;
 497         char *ucp, **uap, *arg0, *arg1;
 498         struct proc *p;
 499         struct lwp *lp;
 500         struct mount *mp;
 501         struct vnode *vp;
 502
 503         p = curproc;
 504
 505         lp = ONLY_LWP_IN_PROC(p);
 506
 507         /* Get the vnode for '/'.  Set p->p_fd->fd_cdir to reference it. */
 508         mp = mountlist_boot_getfirst();
 509         if (VFS_ROOT(mp, &vp))
 510                 panic("cannot find root vnode");
 511         if (mp->mnt_ncmountpt.ncp == NULL) {
 512                 cache_allocroot(&mp->mnt_ncmountpt, mp, vp);
 513                 cache_unlock(&mp->mnt_ncmountpt);       /* leave ref intact */
 514         }
 515         p->p_fd->fd_cdir = vp;
 516         vref(p->p_fd->fd_cdir);
 517         p->p_fd->fd_rdir = vp;
 518         vref(p->p_fd->fd_rdir);
 519         vfs_cache_setroot(vp, cache_hold(&mp->mnt_ncmountpt));
 520         vn_unlock(vp);                  /* leave ref intact */
 521         cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_ncdir);
 522         cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_nrdir);
 523
 524         kprintf("Mounting devfs\n");
 525         vfs_mountroot_devfs();
 526
 527         /*
 528          * Need just enough stack to hold the faked-up "execve()" arguments.
 529          */
 530         addr = trunc_page(USRSTACK - PAGE_SIZE);
 531         error = vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr,
 532                             PAGE_SIZE, PAGE_SIZE,
 533                             FALSE, VM_MAPTYPE_NORMAL,
 534                             VM_PROT_ALL, VM_PROT_ALL,
 535                             0);
 536         if (error)
 537                 panic("init: couldn't allocate argument space");
 538         p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
 539         p->p_vmspace->vm_ssize = 1;
 540
 541         if ((var = kgetenv("init_path")) != NULL) {
 542                 strncpy(init_path, var, sizeof init_path);
 543                 init_path[sizeof init_path - 1] = 0;
 544         }
 545         if ((var = kgetenv("kern.fallback_elf_brand")) != NULL)
 546                 fallback_elf_brand = strtol(var, NULL, 0);
 547
 548         for (path = init_path; *path != '\0'; path = next) {
 549                 while (*path == ':')
 550                         path++;
 551                 if (*path == '\0')
 552                         break;
 553                 for (next = path; *next != '\0' && *next != ':'; next++)
 554                         /* nothing */ ;
 555                 if (bootverbose)
 556                         kprintf("start_init: trying %.*s\n", (int)(next - path),
 557                             path);
 558
 559                 /*
 560                  * Move out the boot flag argument.
 561                  */
 562                 options = 0;
 563                 ucp = (char *)USRSTACK;
 564                 (void)subyte(--ucp, 0);         /* trailing zero */
 565                 if (boothowto & RB_SINGLE) {
 566                         (void)subyte(--ucp, 's');
 567                         options = 1;
 568                 }
 569 #ifdef notyet
 570                 if (boothowto & RB_FASTBOOT) {
 571                         (void)subyte(--ucp, 'f');
 572                         options = 1;
 573                 }
 574 #endif
 575
 576 #ifdef BOOTCDROM
 577                 (void)subyte(--ucp, 'C');
 578                 options = 1;
 579 #endif
 580                 if (options == 0)
 581                         (void)subyte(--ucp, '-');
 582                 (void)subyte(--ucp, '-');               /* leading hyphen */
 583                 arg1 = ucp;
 584
 585                 /*
 586                  * Move out the file name (also arg 0).
 587                  */
 588                 (void)subyte(--ucp, 0);
 589                 for (s = next - 1; s >= path; s--)
 590                         (void)subyte(--ucp, *s);
 591                 arg0 = ucp;
 592
 593                 /*
 594                  * Move out the arg pointers.
 595                  */
 596                 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
 597                 (void)suword((caddr_t)--uap, (long)0);  /* terminator */
 598                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
 599                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
 600
 601                 /*
 602                  * Point at the arguments.
 603                  */
 604                 args.fname = arg0;
 605                 args.argv = uap;
 606                 args.envv = NULL;
 607
 608                 /*
 609                  * Now try to exec the program.  If can't for any reason
 610                  * other than it doesn't exist, complain.
 611                  *
 612                  * Otherwise, return via fork_trampoline() all the way
 613                  * to user mode as init!
 614                  *
 615                  * WARNING!  We may have been moved to another cpu after
 616                  * acquiring the current user process designation.  The
 617                  * MP lock will migrate with us though so we still have to
 618                  * release it.
 619                  */
 620                 if ((error = sys_execve(&args)) == 0) {
 621                         rel_mplock();
 622                         lp->lwp_proc->p_usched->acquire_curproc(lp);
 623                         return;
 624                 }
 625                 if (error != ENOENT)
 626                         kprintf("exec %.*s: error %d\n", (int)(next - path),
 627                             path, error);
 628         }
 629         kprintf("init: not found in path %s\n", init_path);
 630         panic("no init");
 631 }
 632
 633 /*
 634  * Like kthread_create(), but runs in it's own address space.
 635  * We do this early to reserve pid 1.
 636  *
 637  * Note special case - do not make it runnable yet.  Other work
 638  * in progress will change this more.
 639  */
 640 static void
 641 create_init(const void *udata __unused)
 642 {
 643         int error;
 644         struct lwp *lp;
 645
 646         crit_enter();
 647         error = fork1(&lwp0, RFFDG | RFPROC, &initproc);
 648         if (error)
 649                 panic("cannot fork init: %d", error);
 650         initproc->p_flag |= P_SYSTEM;
 651         lp = ONLY_LWP_IN_PROC(initproc);
 652         cpu_set_fork_handler(lp, start_init, NULL);
 653         crit_exit();
 654 }
 655 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL)
 656
 657 /*
 658  * Make it runnable now.
 659  */
 660 static void
 661 kick_init(const void *udata __unused)
 662 {
 663         start_forked_proc(&lwp0, initproc);
 664 }
 665 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL)
 666
 667 /*
 668  * Machine independant globaldata initialization
 669  *
 670  * WARNING!  Called from early boot, 'mycpu' may not work yet.
 671  */
 672 void
 673 mi_gdinit(struct globaldata *gd, int cpuid)
 674 {
 675         TAILQ_INIT(&gd->gd_systimerq);
 676         gd->gd_sysid_alloc = cpuid;     /* prime low bits for cpu lookup */
 677         gd->gd_cpuid = cpuid;
 678         gd->gd_cpumask = (cpumask_t)1 << cpuid;
 679         lwkt_gdinit(gd);
 680         vm_map_entry_reserve_cpu_init(gd);
 681         sleep_gdinit(gd);
 682 }
 683