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 1.84 2008/01/06 16:55:51 swildner 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
  70 #include <machine/cpu.h>
  71
  72 #include <vm/vm.h>
  73 #include <vm/vm_param.h>
  74 #include <sys/lock.h>
  75 #include <vm/pmap.h>
  76 #include <vm/vm_map.h>
  77 #include <vm/vm_extern.h>
  78 #include <sys/user.h>
  79 #include <sys/copyright.h>
  80
  81 /* Components of the first process -- never freed. */
  82 static struct session session0;
  83 static struct pgrp pgrp0;
  84 static struct sigacts sigacts0;
  85 static struct filedesc filedesc0;
  86 static struct plimit limit0;
  87 static struct vmspace vmspace0;
  88 struct proc *initproc;
  89 struct proc proc0;
  90 struct lwp lwp0;
  91 struct thread thread0;
  92
  93 int cmask = CMASK;
  94 extern  struct user *proc0paddr;
  95 extern int fallback_elf_brand;
  96
  97 int     boothowto = 0;          /* initialized so that it can be patched */
  98 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, "");
  99
 100 /*
 101  * This ensures that there is at least one entry so that the sysinit_set
 102  * symbol is not undefined.  A sybsystem ID of SI_SPECIAL_DUMMY is never
 103  * executed.
 104  */
 105 SYSINIT(placeholder, SI_SPECIAL_DUMMY, SI_ORDER_ANY, NULL, NULL)
 106
 107 /*
 108  * The sysinit table itself.  Items are checked off as the are run.
 109  * If we want to register new sysinit types, add them to newsysinit.
 110  */
 111 SET_DECLARE(sysinit_set, struct sysinit);
 112 struct sysinit **sysinit, **sysinit_end;
 113 struct sysinit **newsysinit, **newsysinit_end;
 114
 115
 116 /*
 117  * Merge a new sysinit set into the current set, reallocating it if
 118  * necessary.  This can only be called after malloc is running.
 119  */
 120 void
 121 sysinit_add(struct sysinit **set, struct sysinit **set_end)
 122 {
 123         struct sysinit **newset;
 124         struct sysinit **sipp;
 125         struct sysinit **xipp;
 126         int count;
 127
 128         count = set_end - set;
 129         if (newsysinit)
 130                 count += newsysinit_end - newsysinit;
 131         else
 132                 count += sysinit_end - sysinit;
 133         newset = kmalloc(count * sizeof(*sipp), M_TEMP, M_WAITOK);
 134         xipp = newset;
 135         if (newsysinit) {
 136                 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
 137                         *xipp++ = *sipp;
 138         } else {
 139                 for (sipp = sysinit; sipp < sysinit_end; sipp++)
 140                         *xipp++ = *sipp;
 141         }
 142         for (sipp = set; sipp < set_end; sipp++)
 143                 *xipp++ = *sipp;
 144         if (newsysinit)
 145                 kfree(newsysinit, M_TEMP);
 146         newsysinit = newset;
 147         newsysinit_end = newset + count;
 148 }
 149
 150 /*
 151  * Callbacks from machine-dependant startup code (e.g. init386) to set
 152  * up low level entities related to cpu #0's globaldata.
 153  *
 154  * Called from very low level boot code.
 155  */
 156 void
 157 mi_proc0init(struct globaldata *gd, struct user *proc0paddr)
 158 {
 159         lwkt_init_thread(&thread0, proc0paddr, LWKT_THREAD_STACK, 0, gd);
 160         lwkt_set_comm(&thread0, "thread0");
 161         RB_INIT(&proc0.p_lwp_tree);
 162         proc0.p_lasttid = 0;    /* +1 = next TID */
 163         lwp_rb_tree_RB_INSERT(&proc0.p_lwp_tree, &lwp0);
 164         lwp0.lwp_thread = &thread0;
 165         lwp0.lwp_proc = &proc0;
 166         proc0.p_usched = usched_init();
 167         lwp0.lwp_cpumask = 0xFFFFFFFF;
 168         varsymset_init(&proc0.p_varsymset, NULL);
 169         thread0.td_flags |= TDF_RUNNING;
 170         thread0.td_proc = &proc0;
 171         thread0.td_lwp = &lwp0;
 172         thread0.td_switch = cpu_heavy_switch;   /* YYY eventually LWKT */
 173         lwkt_schedule_self(curthread);
 174 }
 175
 176 /*
 177  * System startup; initialize the world, create process 0, mount root
 178  * filesystem, and fork to create init and pagedaemon.  Most of the
 179  * hard work is done in the lower-level initialization routines including
 180  * startup(), which does memory initialization and autoconfiguration.
 181  *
 182  * This allows simple addition of new kernel subsystems that require
 183  * boot time initialization.  It also allows substitution of subsystem
 184  * (for instance, a scheduler, kernel profiler, or VM system) by object
 185  * module.  Finally, it allows for optional "kernel threads".
 186  */
 187 void
 188 mi_startup(void)
 189 {
 190         struct sysinit *sip;            /* system initialization*/
 191         struct sysinit **sipp;          /* system initialization*/
 192         struct sysinit **xipp;          /* interior loop of sort*/
 193         struct sysinit *save;           /* bubble*/
 194
 195         if (sysinit == NULL) {
 196                 sysinit = SET_BEGIN(sysinit_set);
 197                 sysinit_end = SET_LIMIT(sysinit_set);
 198         }
 199
 200 restart:
 201         /*
 202          * Perform a bubble sort of the system initialization objects by
 203          * their subsystem (primary key) and order (secondary key).
 204          */
 205         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
 206                 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
 207                         if ((*sipp)->subsystem < (*xipp)->subsystem ||
 208                              ((*sipp)->subsystem == (*xipp)->subsystem &&
 209                               (*sipp)->order <= (*xipp)->order))
 210                                 continue;       /* skip*/
 211                         save = *sipp;
 212                         *sipp = *xipp;
 213                         *xipp = save;
 214                 }
 215         }
 216
 217         /*
 218          * Traverse the (now) ordered list of system initialization tasks.
 219          * Perform each task, and continue on to the next task.
 220          *
 221          * The last item on the list is expected to be the scheduler,
 222          * which will not return.
 223          */
 224         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
 225                 sip = *sipp;
 226                 if (sip->subsystem == SI_SPECIAL_DUMMY)
 227                         continue;       /* skip dummy task(s)*/
 228
 229                 if (sip->subsystem == SI_SPECIAL_DONE)
 230                         continue;
 231
 232                 /* Call function */
 233                 (*(sip->func))(sip->udata);
 234
 235                 /* Check off the one we're just done */
 236                 sip->subsystem = SI_SPECIAL_DONE;
 237
 238                 /* Check if we've installed more sysinit items via KLD */
 239                 if (newsysinit != NULL) {
 240                         if (sysinit != SET_BEGIN(sysinit_set))
 241                                 kfree(sysinit, M_TEMP);
 242                         sysinit = newsysinit;
 243                         sysinit_end = newsysinit_end;
 244                         newsysinit = NULL;
 245                         newsysinit_end = NULL;
 246                         goto restart;
 247                 }
 248         }
 249
 250         panic("Shouldn't get here!");
 251         /* NOTREACHED*/
 252 }
 253
 254
 255 /*
 256  ***************************************************************************
 257  ****
 258  **** The following SYSINIT's belong elsewhere, but have not yet
 259  **** been moved.
 260  ****
 261  ***************************************************************************
 262  */
 263 static void
 264 print_caddr_t(void *data __unused)
 265 {
 266         kprintf("%s", (char *)data);
 267 }
 268 SYSINIT(announce, SI_BOOT1_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright)
 269
 270 /*
 271  * Leave the critical section that protected us from spurious interrupts
 272  * so device probes work.
 273  */
 274 static void
 275 leavecrit(void *dummy __unused)
 276 {
 277         MachIntrABI.finalize();
 278         cpu_enable_intr();
 279         MachIntrABI.cleanup();
 280         crit_exit();
 281         KKASSERT(!IN_CRITICAL_SECT(curthread));
 282
 283         if (bootverbose)
 284                 kprintf("Leaving critical section, allowing interrupts\n");
 285 }
 286 SYSINIT(leavecrit, SI_BOOT2_LEAVE_CRIT, SI_ORDER_ANY, leavecrit, NULL)
 287
 288 /*
 289  * This is called after the threading system is up and running,
 290  * including the softclock, clock interrupts, and SMP.
 291  */
 292 static void
 293 tsleepworks(void *dummy __unused)
 294 {
 295         tsleep_now_works = 1;
 296 }
 297 SYSINIT(tsleepworks, SI_BOOT2_FINISH_SMP, SI_ORDER_SECOND, tsleepworks, NULL)
 298
 299 /*
 300  * This is called after devices have configured.  Tell the kernel we are
 301  * no longer in cold boot.
 302  */
 303 static void
 304 endofcoldboot(void *dummy __unused)
 305 {
 306         cold = 0;
 307 }
 308 SYSINIT(endofcoldboot, SI_SUB_ISWARM, SI_ORDER_ANY, endofcoldboot, NULL)
 309
 310 /*
 311  ***************************************************************************
 312  ****
 313  **** The two following SYSINT's are proc0 specific glue code.  I am not
 314  **** convinced that they can not be safely combined, but their order of
 315  **** operation has been maintained as the same as the original init_main.c
 316  **** for right now.
 317  ****
 318  **** These probably belong in init_proc.c or kern_proc.c, since they
 319  **** deal with proc0 (the fork template process).
 320  ****
 321  ***************************************************************************
 322  */
 323 /* ARGSUSED*/
 324 static void
 325 proc0_init(void *dummy __unused)
 326 {
 327         struct proc *p;
 328         struct lwp *lp;
 329
 330         p = &proc0;
 331         lp = &lwp0;
 332
 333         /*
 334          * Initialize process and pgrp structures.
 335          */
 336         procinit();
 337
 338         /*
 339          * additional VM structures
 340          */
 341         vm_init2();
 342
 343         /*
 344          * Create process 0 (the swapper).
 345          */
 346         LIST_INSERT_HEAD(&allproc, p, p_list);
 347         p->p_pgrp = &pgrp0;
 348         LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
 349         LIST_INIT(&pgrp0.pg_members);
 350         LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
 351
 352         pgrp0.pg_session = &session0;
 353         session0.s_count = 1;
 354         session0.s_leader = p;
 355
 356         p->p_sysent = &aout_sysvec;
 357
 358         p->p_flag = P_SYSTEM;
 359         p->p_stat = SACTIVE;
 360         lp->lwp_stat = LSRUN;
 361         p->p_nice = NZERO;
 362         p->p_rtprio.type = RTP_PRIO_NORMAL;
 363         p->p_rtprio.prio = 0;
 364         lp->lwp_rtprio = p->p_rtprio;
 365
 366         p->p_peers = 0;
 367         p->p_leader = p;
 368
 369         bcopy("swapper", p->p_comm, sizeof ("swapper"));
 370         bcopy("swapper", thread0.td_comm, sizeof ("swapper"));
 371
 372         /* Create credentials. */
 373         p->p_ucred = crget();
 374         p->p_ucred->cr_ruidinfo = uifind(0);
 375         p->p_ucred->cr_ngroups = 1;     /* group 0 */
 376         p->p_ucred->cr_uidinfo = uifind(0);
 377
 378         /* Don't jail it */
 379         p->p_ucred->cr_prison = NULL;
 380
 381         /* Create sigacts. */
 382         p->p_sigacts = &sigacts0;
 383         p->p_sigacts->ps_refcnt = 1;
 384
 385         /* Initialize signal state for process 0. */
 386         siginit(p);
 387
 388         /* Create the file descriptor table. */
 389         fdinit_bootstrap(p, &filedesc0, cmask);
 390
 391         /* Create the limits structures. */
 392         plimit_init0(&limit0);
 393         p->p_limit = &limit0;
 394
 395         /* Allocate a prototype map so we have something to fork. */
 396         pmap_pinit0(vmspace_pmap(&vmspace0));
 397         p->p_vmspace = &vmspace0;
 398         lp->lwp_vmspace = p->p_vmspace;
 399         sysref_init(&vmspace0.vm_sysref, &vmspace_sysref_class);
 400         vm_map_init(&vmspace0.vm_map,
 401                     round_page(VM_MIN_USER_ADDRESS),
 402                     trunc_page(VM_MAX_USER_ADDRESS),
 403                     vmspace_pmap(&vmspace0));
 404         sysref_activate(&vmspace0.vm_sysref);
 405
 406         /*
 407          * Charge root for one process.
 408          */
 409         (void)chgproccnt(p->p_ucred->cr_uidinfo, 1, 0);
 410         vm_init_limits(p);
 411 }
 412 SYSINIT(p0init, SI_BOOT2_PROC0, SI_ORDER_FIRST, proc0_init, NULL)
 413
 414 static int proc0_post_callback(struct proc *p, void *data __unused);
 415
 416 /* ARGSUSED*/
 417 static void
 418 proc0_post(void *dummy __unused)
 419 {
 420         struct timespec ts;
 421
 422         /*
 423          * Now we can look at the time, having had a chance to verify the
 424          * time from the file system.  Pretend that proc0 started now.
 425          */
 426         allproc_scan(proc0_post_callback, NULL);
 427
 428         /*
 429          * Give the ``random'' number generator a thump.
 430          * XXX: Does read_random() contain enough bits to be used here ?
 431          */
 432         nanotime(&ts);
 433         skrandom(ts.tv_sec ^ ts.tv_nsec);
 434 }
 435
 436 static int
 437 proc0_post_callback(struct proc *p, void *data __unused)
 438 {
 439         microtime(&p->p_start);
 440         return(0);
 441 }
 442
 443 SYSINIT(p0post, SI_SUB_PROC0_POST, SI_ORDER_FIRST, proc0_post, NULL)
 444
 445 /*
 446  ***************************************************************************
 447  ****
 448  **** The following SYSINIT's and glue code should be moved to the
 449  **** respective files on a per subsystem basis.
 450  ****
 451  ***************************************************************************
 452  */
 453
 454
 455 /*
 456  ***************************************************************************
 457  ****
 458  **** The following code probably belongs in another file, like
 459  **** kern/init_init.c.
 460  ****
 461  ***************************************************************************
 462  */
 463
 464 /*
 465  * List of paths to try when searching for "init".
 466  */
 467 static char init_path[MAXPATHLEN] =
 468 #ifdef  INIT_PATH
 469     __XSTRING(INIT_PATH);
 470 #else
 471     "/sbin/init:/sbin/oinit:/sbin/init.bak";
 472 #endif
 473 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, "");
 474
 475 /*
 476  * Start the initial user process; try exec'ing each pathname in init_path.
 477  * The program is invoked with one argument containing the boot flags.
 478  *
 479  * The MP lock is held on entry.
 480  */
 481 static void
 482 start_init(void *dummy, struct trapframe *frame)
 483 {
 484         vm_offset_t addr;
 485         struct execve_args args;
 486         int options, error;
 487         char *var, *path, *next, *s;
 488         char *ucp, **uap, *arg0, *arg1;
 489         struct proc *p;
 490         struct lwp *lp;
 491         struct mount *mp;
 492         struct vnode *vp;
 493
 494         p = curproc;
 495
 496         lp = ONLY_LWP_IN_PROC(p);
 497
 498         /* Get the vnode for '/'.  Set p->p_fd->fd_cdir to reference it. */
 499         mp = mountlist_boot_getfirst();
 500         if (VFS_ROOT(mp, &vp))
 501                 panic("cannot find root vnode");
 502         if (mp->mnt_ncmountpt.ncp == NULL) {
 503                 cache_allocroot(&mp->mnt_ncmountpt, mp, vp);
 504                 cache_unlock(&mp->mnt_ncmountpt);       /* leave ref intact */
 505         }
 506         p->p_fd->fd_cdir = vp;
 507         vref(p->p_fd->fd_cdir);
 508         p->p_fd->fd_rdir = vp;
 509         vref(p->p_fd->fd_rdir);
 510         vfs_cache_setroot(vp, cache_hold(&mp->mnt_ncmountpt));
 511         vn_unlock(vp);                  /* leave ref intact */
 512         cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_ncdir);
 513         cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_nrdir);
 514
 515         /*
 516          * Need just enough stack to hold the faked-up "execve()" arguments.
 517          */
 518         addr = trunc_page(USRSTACK - PAGE_SIZE);
 519         error = vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
 520                             FALSE,
 521                             VM_MAPTYPE_NORMAL,
 522                             VM_PROT_ALL, VM_PROT_ALL,
 523                             0);
 524         if (error)
 525                 panic("init: couldn't allocate argument space");
 526         p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
 527         p->p_vmspace->vm_ssize = 1;
 528
 529         if ((var = kgetenv("init_path")) != NULL) {
 530                 strncpy(init_path, var, sizeof init_path);
 531                 init_path[sizeof init_path - 1] = 0;
 532         }
 533         if ((var = kgetenv("kern.fallback_elf_brand")) != NULL)
 534                 fallback_elf_brand = strtol(var, NULL, 0);
 535
 536         for (path = init_path; *path != '\0'; path = next) {
 537                 while (*path == ':')
 538                         path++;
 539                 if (*path == '\0')
 540                         break;
 541                 for (next = path; *next != '\0' && *next != ':'; next++)
 542                         /* nothing */ ;
 543                 if (bootverbose)
 544                         kprintf("start_init: trying %.*s\n", (int)(next - path),
 545                             path);
 546
 547                 /*
 548                  * Move out the boot flag argument.
 549                  */
 550                 options = 0;
 551                 ucp = (char *)USRSTACK;
 552                 (void)subyte(--ucp, 0);         /* trailing zero */
 553                 if (boothowto & RB_SINGLE) {
 554                         (void)subyte(--ucp, 's');
 555                         options = 1;
 556                 }
 557 #ifdef notyet
 558                 if (boothowto & RB_FASTBOOT) {
 559                         (void)subyte(--ucp, 'f');
 560                         options = 1;
 561                 }
 562 #endif
 563
 564 #ifdef BOOTCDROM
 565                 (void)subyte(--ucp, 'C');
 566                 options = 1;
 567 #endif
 568                 if (options == 0)
 569                         (void)subyte(--ucp, '-');
 570                 (void)subyte(--ucp, '-');               /* leading hyphen */
 571                 arg1 = ucp;
 572
 573                 /*
 574                  * Move out the file name (also arg 0).
 575                  */
 576                 (void)subyte(--ucp, 0);
 577                 for (s = next - 1; s >= path; s--)
 578                         (void)subyte(--ucp, *s);
 579                 arg0 = ucp;
 580
 581                 /*
 582                  * Move out the arg pointers.
 583                  */
 584                 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
 585                 (void)suword((caddr_t)--uap, (long)0);  /* terminator */
 586                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
 587                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
 588
 589                 /*
 590                  * Point at the arguments.
 591                  */
 592                 args.fname = arg0;
 593                 args.argv = uap;
 594                 args.envv = NULL;
 595
 596                 /*
 597                  * Now try to exec the program.  If can't for any reason
 598                  * other than it doesn't exist, complain.
 599                  *
 600                  * Otherwise, return via fork_trampoline() all the way
 601                  * to user mode as init!
 602                  *
 603                  * WARNING!  We may have been moved to another cpu after
 604                  * acquiring the current user process designation.  The
 605                  * MP lock will migrate with us though so we still have to
 606                  * release it.
 607                  */
 608                 if ((error = sys_execve(&args)) == 0) {
 609                         rel_mplock();
 610                         lp->lwp_proc->p_usched->acquire_curproc(lp);
 611                         return;
 612                 }
 613                 if (error != ENOENT)
 614                         kprintf("exec %.*s: error %d\n", (int)(next - path),
 615                             path, error);
 616         }
 617         kprintf("init: not found in path %s\n", init_path);
 618         panic("no init");
 619 }
 620
 621 /*
 622  * Like kthread_create(), but runs in it's own address space.
 623  * We do this early to reserve pid 1.
 624  *
 625  * Note special case - do not make it runnable yet.  Other work
 626  * in progress will change this more.
 627  */
 628 static void
 629 create_init(const void *udata __unused)
 630 {
 631         int error;
 632         struct lwp *lp;
 633
 634         crit_enter();
 635         error = fork1(&lwp0, RFFDG | RFPROC, &initproc);
 636         if (error)
 637                 panic("cannot fork init: %d", error);
 638         initproc->p_flag |= P_SYSTEM;
 639         lp = ONLY_LWP_IN_PROC(initproc);
 640         cpu_set_fork_handler(lp, start_init, NULL);
 641         crit_exit();
 642 }
 643 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL)
 644
 645 /*
 646  * Make it runnable now.
 647  */
 648 static void
 649 kick_init(const void *udata __unused)
 650 {
 651         start_forked_proc(&lwp0, initproc);
 652 }
 653 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL)
 654
 655 /*
 656  * Machine independant globaldata initialization
 657  *
 658  * WARNING!  Called from early boot, 'mycpu' may not work yet.
 659  */
 660 void
 661 mi_gdinit(struct globaldata *gd, int cpuid)
 662 {
 663         TAILQ_INIT(&gd->gd_tdfreeq);    /* for pmap_{new,dispose}_thread() */
 664         TAILQ_INIT(&gd->gd_systimerq);
 665         gd->gd_sysid_alloc = cpuid;     /* prime low bits for cpu lookup */
 666         gd->gd_cpuid = cpuid;
 667         gd->gd_cpumask = (cpumask_t)1 << cpuid;
 668         lwkt_gdinit(gd);
 669         vm_map_entry_reserve_cpu_init(gd);
 670         sleep_gdinit(gd);
 671 }
 672