Adjust pamp_growkernel(), elf_brand_inuse(), and ktrace() to use
[dragonfly.git] / sys / kern / init_main.c
CommitLineData
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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 $
c0b8a06d 43 * $DragonFly: src/sys/kern/init_main.c,v 1.54 2006/05/23 20:35:10 dillon Exp $
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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>
dadab5e9 65#include <sys/file2.h>
f8c3996b 66#include <sys/thread2.h>
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67
68#include <machine/cpu.h>
69
70#include <vm/vm.h>
71#include <vm/vm_param.h>
72#include <sys/lock.h>
73#include <vm/pmap.h>
74#include <vm/vm_map.h>
75#include <sys/user.h>
76#include <sys/copyright.h>
77
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78void mi_startup(void); /* Should be elsewhere */
79
80/* Components of the first process -- never freed. */
81static struct session session0;
82static struct pgrp pgrp0;
984263bc 83static struct procsig procsig0;
0679adc4 84static struct filedesc filedesc0;
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85static struct plimit limit0;
86static struct vmspace vmspace0;
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87struct proc *initproc;
88struct proc proc0;
89struct thread thread0;
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90
91int cmask = CMASK;
92extern struct user *proc0paddr;
93extern int fallback_elf_brand;
94
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95int boothowto = 0; /* initialized so that it can be patched */
96SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, "");
97
98/*
99 * This ensures that there is at least one entry so that the sysinit_set
100 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
101 * executed.
102 */
103SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL)
104
105/*
106 * The sysinit table itself. Items are checked off as the are run.
107 * If we want to register new sysinit types, add them to newsysinit.
108 */
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109SET_DECLARE(sysinit_set, struct sysinit);
110struct sysinit **sysinit, **sysinit_end;
111struct sysinit **newsysinit, **newsysinit_end;
112
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113
114/*
115 * Merge a new sysinit set into the current set, reallocating it if
116 * necessary. This can only be called after malloc is running.
117 */
118void
dc62b251 119sysinit_add(struct sysinit **set, struct sysinit **set_end)
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120{
121 struct sysinit **newset;
122 struct sysinit **sipp;
123 struct sysinit **xipp;
dc62b251 124 int count;
984263bc 125
dc62b251 126 count = set_end - set;
984263bc 127 if (newsysinit)
dc62b251 128 count += newsysinit_end - newsysinit;
984263bc 129 else
dc62b251 130 count += sysinit_end - sysinit;
dc97bdfd 131 newset = malloc(count * sizeof(*sipp), M_TEMP, M_WAITOK);
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132 if (newset == NULL)
133 panic("cannot malloc for sysinit");
134 xipp = newset;
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135 if (newsysinit) {
136 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
984263bc 137 *xipp++ = *sipp;
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138 } else {
139 for (sipp = sysinit; sipp < sysinit_end; sipp++)
984263bc 140 *xipp++ = *sipp;
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141 }
142 for (sipp = set; sipp < set_end; sipp++)
984263bc 143 *xipp++ = *sipp;
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144 if (newsysinit)
145 free(newsysinit, M_TEMP);
146 newsysinit = newset;
dc62b251 147 newsysinit_end = newset + count;
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148}
149
150/*
151 * System startup; initialize the world, create process 0, mount root
152 * filesystem, and fork to create init and pagedaemon. Most of the
153 * hard work is done in the lower-level initialization routines including
154 * startup(), which does memory initialization and autoconfiguration.
155 *
156 * This allows simple addition of new kernel subsystems that require
157 * boot time initialization. It also allows substitution of subsystem
158 * (for instance, a scheduler, kernel profiler, or VM system) by object
159 * module. Finally, it allows for optional "kernel threads".
160 */
161void
162mi_startup(void)
163{
8a8d5d85 164 struct sysinit *sip; /* system initialization*/
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165 struct sysinit **sipp; /* system initialization*/
166 struct sysinit **xipp; /* interior loop of sort*/
167 struct sysinit *save; /* bubble*/
984263bc 168
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169 if (sysinit == NULL) {
170 sysinit = SET_BEGIN(sysinit_set);
171 sysinit_end = SET_LIMIT(sysinit_set);
172 }
173
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174restart:
175 /*
176 * Perform a bubble sort of the system initialization objects by
177 * their subsystem (primary key) and order (secondary key).
178 */
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179 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
180 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
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181 if ((*sipp)->subsystem < (*xipp)->subsystem ||
182 ((*sipp)->subsystem == (*xipp)->subsystem &&
183 (*sipp)->order <= (*xipp)->order))
184 continue; /* skip*/
185 save = *sipp;
186 *sipp = *xipp;
187 *xipp = save;
188 }
189 }
190
191 /*
192 * Traverse the (now) ordered list of system initialization tasks.
193 * Perform each task, and continue on to the next task.
194 *
195 * The last item on the list is expected to be the scheduler,
196 * which will not return.
197 */
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198 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
199 sip = *sipp;
8a8d5d85 200 if (sip->subsystem == SI_SUB_DUMMY)
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201 continue; /* skip dummy task(s)*/
202
8a8d5d85 203 if (sip->subsystem == SI_SUB_DONE)
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204 continue;
205
206 /* Call function */
8a8d5d85 207 (*(sip->func))(sip->udata);
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208
209 /* Check off the one we're just done */
8a8d5d85 210 sip->subsystem = SI_SUB_DONE;
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211
212 /* Check if we've installed more sysinit items via KLD */
213 if (newsysinit != NULL) {
dc62b251 214 if (sysinit != SET_BEGIN(sysinit_set))
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215 free(sysinit, M_TEMP);
216 sysinit = newsysinit;
dc62b251 217 sysinit_end = newsysinit_end;
984263bc 218 newsysinit = NULL;
dc62b251 219 newsysinit_end = NULL;
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220 goto restart;
221 }
222 }
223
224 panic("Shouldn't get here!");
225 /* NOTREACHED*/
226}
227
228
229/*
230 ***************************************************************************
231 ****
232 **** The following SYSINIT's belong elsewhere, but have not yet
233 **** been moved.
234 ****
235 ***************************************************************************
236 */
237static void
238print_caddr_t(void *data __unused)
239{
240 printf("%s", (char *)data);
241}
242SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright)
243
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244/*
245 * Leave the critical section that protected us from spurious interrupts
246 * so device probes work.
247 */
248static void
249leavecrit(void *dummy __unused)
250{
251 crit_exit();
252 KKASSERT(!IN_CRITICAL_SECT(curthread));
253 if (bootverbose)
254 printf("Leaving critical section, allowing interrupts\n");
255}
256SYSINIT(leavecrit, SI_SUB_LEAVE_CRIT, SI_ORDER_ANY, leavecrit, NULL)
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257
258/*
259 ***************************************************************************
260 ****
261 **** The two following SYSINT's are proc0 specific glue code. I am not
262 **** convinced that they can not be safely combined, but their order of
263 **** operation has been maintained as the same as the original init_main.c
264 **** for right now.
265 ****
266 **** These probably belong in init_proc.c or kern_proc.c, since they
267 **** deal with proc0 (the fork template process).
268 ****
269 ***************************************************************************
270 */
271/* ARGSUSED*/
272static void
273proc0_init(void *dummy __unused)
274{
0679adc4 275 struct proc *p;
81eea9f4 276 struct lwp *lp;
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277
278 p = &proc0;
81eea9f4 279 lp = &proc0.p_lwp; /* XXX lwp to be: lwp0 */
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280
281 /*
282 * Initialize process and pgrp structures.
283 */
284 procinit();
285
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286 /*
287 * additional VM structures
288 */
289 vm_init2();
290
291 /*
292 * Create process 0 (the swapper).
293 */
294 LIST_INSERT_HEAD(&allproc, p, p_list);
295 p->p_pgrp = &pgrp0;
296 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
297 LIST_INIT(&pgrp0.pg_members);
298 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
299
300 pgrp0.pg_session = &session0;
301 session0.s_count = 1;
302 session0.s_leader = p;
303
304 p->p_sysent = &aout_sysvec;
81eea9f4 305 TAILQ_INIT(&lp->lwp_sysmsgq);
984263bc 306
344ad853 307 p->p_flag = P_SYSTEM;
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308 p->p_stat = SRUN;
309 p->p_nice = NZERO;
310 p->p_rtprio.type = RTP_PRIO_NORMAL;
311 p->p_rtprio.prio = 0;
b19f1310 312 p->p_lwp.lwp_rtprio = p->p_rtprio;
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313
314 p->p_peers = 0;
315 p->p_leader = p;
316
317 bcopy("swapper", p->p_comm, sizeof ("swapper"));
81eea9f4 318 bcopy("swapper", thread0.td_comm, sizeof ("swapper"));
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319
320 /* Create credentials. */
984263bc 321 p->p_ucred = crget();
41c20dac 322 p->p_ucred->cr_ruidinfo = uifind(0);
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323 p->p_ucred->cr_ngroups = 1; /* group 0 */
324 p->p_ucred->cr_uidinfo = uifind(0);
325
326 /* Don't jail it */
41c20dac 327 p->p_ucred->cr_prison = NULL;
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328
329 /* Create procsig. */
330 p->p_procsig = &procsig0;
331 p->p_procsig->ps_refcnt = 1;
332
333 /* Initialize signal state for process 0. */
c0b8a06d 334 siginit(p);
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335
336 /* Create the file descriptor table. */
228b401d 337 fdinit_bootstrap(p, &filedesc0, cmask);
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338
339 /* Create the limits structures. */
c0b8a06d 340 plimit_init0(&limit0);
984263bc 341 p->p_limit = &limit0;
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342
343 /* Allocate a prototype map so we have something to fork. */
344 pmap_pinit0(vmspace_pmap(&vmspace0));
345 p->p_vmspace = &vmspace0;
346 vmspace0.vm_refcnt = 1;
347 vm_map_init(&vmspace0.vm_map, round_page(VM_MIN_ADDRESS),
348 trunc_page(VM_MAXUSER_ADDRESS));
349 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0);
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350
351 /*
352 * We continue to place resource usage info and signal
353 * actions in the user struct so they're pageable.
354 */
355 p->p_stats = &p->p_addr->u_stats;
356 p->p_sigacts = &p->p_addr->u_sigacts;
357
358 /*
359 * Charge root for one process.
360 */
41c20dac 361 (void)chgproccnt(p->p_ucred->cr_uidinfo, 1, 0);
984263bc 362
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363}
364SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL)
365
366/* ARGSUSED*/
367static void
368proc0_post(void *dummy __unused)
369{
370 struct timespec ts;
371 struct proc *p;
372
373 /*
374 * Now we can look at the time, having had a chance to verify the
375 * time from the file system. Pretend that proc0 started now.
376 */
f62004ad 377 FOREACH_PROC_IN_SYSTEM(p) {
d9fa5f67 378 microtime(&p->p_start);
984263bc 379 }
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380
381 /*
382 * Give the ``random'' number generator a thump.
383 * XXX: Does read_random() contain enough bits to be used here ?
384 */
385 nanotime(&ts);
386 srandom(ts.tv_sec ^ ts.tv_nsec);
387}
388SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL)
389
390/*
391 ***************************************************************************
392 ****
393 **** The following SYSINIT's and glue code should be moved to the
394 **** respective files on a per subsystem basis.
395 ****
396 ***************************************************************************
397 */
398
399
400/*
401 ***************************************************************************
402 ****
403 **** The following code probably belongs in another file, like
404 **** kern/init_init.c.
405 ****
406 ***************************************************************************
407 */
408
409/*
410 * List of paths to try when searching for "init".
411 */
412static char init_path[MAXPATHLEN] =
413#ifdef INIT_PATH
414 __XSTRING(INIT_PATH);
415#else
416 "/sbin/init:/sbin/oinit:/sbin/init.bak:/stand/sysinstall";
417#endif
418SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, "");
419
420/*
421 * Start the initial user process; try exec'ing each pathname in init_path.
422 * The program is invoked with one argument containing the boot flags.
8a8d5d85
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423 *
424 * The MP lock is held on entry.
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425 */
426static void
427start_init(void *dummy)
428{
429 vm_offset_t addr;
430 struct execve_args args;
431 int options, error;
432 char *var, *path, *next, *s;
433 char *ucp, **uap, *arg0, *arg1;
434 struct proc *p;
553ea3c8 435 struct lwp *lp;
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436 struct mount *mp;
437 struct vnode *vp;
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438
439 p = curproc;
440
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SS
441 KKASSERT(p->p_nthreads == 1);
442
443 lp = LIST_FIRST(&p->p_lwps);
444
984263bc 445 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */
861905fb 446 mp = mountlist_boot_getfirst();
21739618 447 if (VFS_ROOT(mp, &vp))
984263bc 448 panic("cannot find root vnode");
8c361dda 449 if (mp->mnt_ncp == NULL) {
5fd012e0 450 mp->mnt_ncp = cache_allocroot(mp, vp);
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MD
451 cache_unlock(mp->mnt_ncp); /* leave ref intact */
452 }
21739618 453 p->p_fd->fd_cdir = vp;
597aea93 454 vref(p->p_fd->fd_cdir);
21739618 455 p->p_fd->fd_rdir = vp;
597aea93 456 vref(p->p_fd->fd_rdir);
21739618 457 vfs_cache_setroot(vp, cache_hold(mp->mnt_ncp));
ca466bae 458 VOP_UNLOCK(vp, 0); /* leave ref intact */
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459 p->p_fd->fd_ncdir = cache_hold(mp->mnt_ncp);
460 p->p_fd->fd_nrdir = cache_hold(mp->mnt_ncp);
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461
462 /*
463 * Need just enough stack to hold the faked-up "execve()" arguments.
464 */
465 addr = trunc_page(USRSTACK - PAGE_SIZE);
466 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
467 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
468 panic("init: couldn't allocate argument space");
469 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
470 p->p_vmspace->vm_ssize = 1;
471
472 if ((var = getenv("init_path")) != NULL) {
473 strncpy(init_path, var, sizeof init_path);
474 init_path[sizeof init_path - 1] = 0;
475 }
476 if ((var = getenv("kern.fallback_elf_brand")) != NULL)
477 fallback_elf_brand = strtol(var, NULL, 0);
478
479 for (path = init_path; *path != '\0'; path = next) {
480 while (*path == ':')
481 path++;
482 if (*path == '\0')
483 break;
484 for (next = path; *next != '\0' && *next != ':'; next++)
485 /* nothing */ ;
486 if (bootverbose)
487 printf("start_init: trying %.*s\n", (int)(next - path),
488 path);
489
490 /*
491 * Move out the boot flag argument.
492 */
493 options = 0;
494 ucp = (char *)USRSTACK;
495 (void)subyte(--ucp, 0); /* trailing zero */
496 if (boothowto & RB_SINGLE) {
497 (void)subyte(--ucp, 's');
498 options = 1;
499 }
500#ifdef notyet
501 if (boothowto & RB_FASTBOOT) {
502 (void)subyte(--ucp, 'f');
503 options = 1;
504 }
505#endif
506
507#ifdef BOOTCDROM
508 (void)subyte(--ucp, 'C');
509 options = 1;
510#endif
511 if (options == 0)
512 (void)subyte(--ucp, '-');
513 (void)subyte(--ucp, '-'); /* leading hyphen */
514 arg1 = ucp;
515
516 /*
517 * Move out the file name (also arg 0).
518 */
519 (void)subyte(--ucp, 0);
520 for (s = next - 1; s >= path; s--)
521 (void)subyte(--ucp, *s);
522 arg0 = ucp;
523
524 /*
525 * Move out the arg pointers.
526 */
527 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
528 (void)suword((caddr_t)--uap, (long)0); /* terminator */
529 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
530 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
531
532 /*
533 * Point at the arguments.
534 */
535 args.fname = arg0;
536 args.argv = uap;
537 args.envv = NULL;
538
539 /*
540 * Now try to exec the program. If can't for any reason
541 * other than it doesn't exist, complain.
542 *
543 * Otherwise, return via fork_trampoline() all the way
544 * to user mode as init!
a2a5ad0d
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545 *
546 * WARNING! We may have been moved to another cpu after
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547 * acquiring the current user process designation. The
548 * MP lock will migrate with us though so we still have to
549 * release it.
984263bc 550 */
8a8d5d85 551 if ((error = execve(&args)) == 0) {
553ea3c8
SS
552 if (lp->lwp_thread->td_gd->gd_uschedcp != lp)
553 lp->lwp_proc->p_usched->acquire_curproc(lp);
8a8d5d85 554 rel_mplock();
984263bc 555 return;
8a8d5d85 556 }
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557 if (error != ENOENT)
558 printf("exec %.*s: error %d\n", (int)(next - path),
559 path, error);
560 }
561 printf("init: not found in path %s\n", init_path);
562 panic("no init");
563}
564
565/*
566 * Like kthread_create(), but runs in it's own address space.
567 * We do this early to reserve pid 1.
568 *
569 * Note special case - do not make it runnable yet. Other work
570 * in progress will change this more.
571 */
572static void
573create_init(const void *udata __unused)
574{
575 int error;
984263bc 576
e43a034f 577 crit_enter();
553ea3c8 578 error = fork1(&proc0.p_lwp, RFFDG | RFPROC, &initproc);
984263bc 579 if (error)
fc92d4aa 580 panic("cannot fork init: %d", error);
344ad853 581 initproc->p_flag |= P_SYSTEM;
984263bc 582 cpu_set_fork_handler(initproc, start_init, NULL);
e43a034f 583 crit_exit();
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MD
584}
585SYSINIT(init,SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL)
586
587/*
588 * Make it runnable now.
589 */
590static void
591kick_init(const void *udata __unused)
592{
553ea3c8 593 start_forked_proc(&proc0.p_lwp, initproc);
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594}
595SYSINIT(kickinit,SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL)
8ad65e08
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596
597/*
598 * Machine independant globaldata initialization
73e4f7b9
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599 *
600 * WARNING! Called from early boot, 'mycpu' may not work yet.
8ad65e08
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601 */
602void
d0e06f83 603mi_gdinit(struct globaldata *gd, int cpuid)
8ad65e08 604{
85100692 605 TAILQ_INIT(&gd->gd_tdfreeq); /* for pmap_{new,dispose}_thread() */
88c4d2f6 606 TAILQ_INIT(&gd->gd_systimerq);
d0e06f83 607 gd->gd_cpuid = cpuid;
fda1ad89 608 gd->gd_cpumask = (cpumask_t)1 << cpuid;
8ad65e08 609 lwkt_gdinit(gd);
41a01a4d 610 vm_map_entry_reserve_cpu_init(gd);
fc17ad60 611 sleep_gdinit(gd);
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MD
612}
613
614