2 * Copyright (c) 1995 Terrence R. Lambert
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
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10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
11 * the permission of UNIX System Laboratories, Inc.
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22 * must display the following acknowledgement:
23 * This product includes software developed by the University of
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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 1.53 2006/05/19 07:33:45 dillon Exp $
46 #include "opt_init_path.h"
48 #include <sys/param.h>
50 #include <sys/filedesc.h>
51 #include <sys/kernel.h>
52 #include <sys/mount.h>
53 #include <sys/sysctl.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/file2.h>
66 #include <sys/thread2.h>
68 #include <machine/cpu.h>
71 #include <vm/vm_param.h>
74 #include <vm/vm_map.h>
76 #include <sys/copyright.h>
78 void mi_startup(void); /* Should be elsewhere */
80 /* Components of the first process -- never freed. */
81 static struct session session0;
82 static struct pgrp pgrp0;
83 static struct procsig procsig0;
84 static struct filedesc filedesc0;
85 static struct plimit limit0;
86 static struct vmspace vmspace0;
87 struct proc *initproc;
89 struct thread thread0;
92 extern struct user *proc0paddr;
93 extern int fallback_elf_brand;
95 int boothowto = 0; /* initialized so that it can be patched */
96 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, "");
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
103 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL)
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.
109 SET_DECLARE(sysinit_set, struct sysinit);
110 struct sysinit **sysinit, **sysinit_end;
111 struct sysinit **newsysinit, **newsysinit_end;
115 * Merge a new sysinit set into the current set, reallocating it if
116 * necessary. This can only be called after malloc is running.
119 sysinit_add(struct sysinit **set, struct sysinit **set_end)
121 struct sysinit **newset;
122 struct sysinit **sipp;
123 struct sysinit **xipp;
126 count = set_end - set;
128 count += newsysinit_end - newsysinit;
130 count += sysinit_end - sysinit;
131 newset = malloc(count * sizeof(*sipp), M_TEMP, M_WAITOK);
133 panic("cannot malloc for sysinit");
136 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
139 for (sipp = sysinit; sipp < sysinit_end; sipp++)
142 for (sipp = set; sipp < set_end; sipp++)
145 free(newsysinit, M_TEMP);
147 newsysinit_end = newset + count;
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.
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".
164 struct sysinit *sip; /* system initialization*/
165 struct sysinit **sipp; /* system initialization*/
166 struct sysinit **xipp; /* interior loop of sort*/
167 struct sysinit *save; /* bubble*/
169 if (sysinit == NULL) {
170 sysinit = SET_BEGIN(sysinit_set);
171 sysinit_end = SET_LIMIT(sysinit_set);
176 * Perform a bubble sort of the system initialization objects by
177 * their subsystem (primary key) and order (secondary key).
179 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
180 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
181 if ((*sipp)->subsystem < (*xipp)->subsystem ||
182 ((*sipp)->subsystem == (*xipp)->subsystem &&
183 (*sipp)->order <= (*xipp)->order))
192 * Traverse the (now) ordered list of system initialization tasks.
193 * Perform each task, and continue on to the next task.
195 * The last item on the list is expected to be the scheduler,
196 * which will not return.
198 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
200 if (sip->subsystem == SI_SUB_DUMMY)
201 continue; /* skip dummy task(s)*/
203 if (sip->subsystem == SI_SUB_DONE)
207 (*(sip->func))(sip->udata);
209 /* Check off the one we're just done */
210 sip->subsystem = SI_SUB_DONE;
212 /* Check if we've installed more sysinit items via KLD */
213 if (newsysinit != NULL) {
214 if (sysinit != SET_BEGIN(sysinit_set))
215 free(sysinit, M_TEMP);
216 sysinit = newsysinit;
217 sysinit_end = newsysinit_end;
219 newsysinit_end = NULL;
224 panic("Shouldn't get here!");
230 ***************************************************************************
232 **** The following SYSINIT's belong elsewhere, but have not yet
235 ***************************************************************************
238 print_caddr_t(void *data __unused)
240 printf("%s", (char *)data);
242 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright)
245 * Leave the critical section that protected us from spurious interrupts
246 * so device probes work.
249 leavecrit(void *dummy __unused)
252 KKASSERT(!IN_CRITICAL_SECT(curthread));
254 printf("Leaving critical section, allowing interrupts\n");
256 SYSINIT(leavecrit, SI_SUB_LEAVE_CRIT, SI_ORDER_ANY, leavecrit, NULL)
259 ***************************************************************************
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
266 **** These probably belong in init_proc.c or kern_proc.c, since they
267 **** deal with proc0 (the fork template process).
269 ***************************************************************************
273 proc0_init(void *dummy __unused)
280 lp = &proc0.p_lwp; /* XXX lwp to be: lwp0 */
283 * Initialize process and pgrp structures.
288 * additional VM structures
293 * Create process 0 (the swapper).
295 LIST_INSERT_HEAD(&allproc, p, p_list);
297 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
298 LIST_INIT(&pgrp0.pg_members);
299 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
301 pgrp0.pg_session = &session0;
302 session0.s_count = 1;
303 session0.s_leader = p;
305 p->p_sysent = &aout_sysvec;
306 TAILQ_INIT(&lp->lwp_sysmsgq);
308 p->p_flag = P_SYSTEM;
311 p->p_rtprio.type = RTP_PRIO_NORMAL;
312 p->p_rtprio.prio = 0;
313 p->p_lwp.lwp_rtprio = p->p_rtprio;
318 bcopy("swapper", p->p_comm, sizeof ("swapper"));
319 bcopy("swapper", thread0.td_comm, sizeof ("swapper"));
321 /* Create credentials. */
322 p->p_ucred = crget();
323 p->p_ucred->cr_ruidinfo = uifind(0);
324 p->p_ucred->cr_ngroups = 1; /* group 0 */
325 p->p_ucred->cr_uidinfo = uifind(0);
328 p->p_ucred->cr_prison = NULL;
330 /* Create procsig. */
331 p->p_procsig = &procsig0;
332 p->p_procsig->ps_refcnt = 1;
334 /* Initialize signal state for process 0. */
337 /* Create the file descriptor table. */
338 fdinit_bootstrap(p, &filedesc0, cmask);
340 /* Create the limits structures. */
341 p->p_limit = &limit0;
342 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++)
343 limit0.pl_rlimit[i].rlim_cur =
344 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY;
345 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur =
346 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
347 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur =
348 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
349 i = ptoa(vmstats.v_free_count);
350 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i;
351 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i;
352 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3;
353 limit0.p_cpulimit = RLIM_INFINITY;
356 /* Allocate a prototype map so we have something to fork. */
357 pmap_pinit0(vmspace_pmap(&vmspace0));
358 p->p_vmspace = &vmspace0;
359 vmspace0.vm_refcnt = 1;
360 vm_map_init(&vmspace0.vm_map, round_page(VM_MIN_ADDRESS),
361 trunc_page(VM_MAXUSER_ADDRESS));
362 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0);
365 * We continue to place resource usage info and signal
366 * actions in the user struct so they're pageable.
368 p->p_stats = &p->p_addr->u_stats;
369 p->p_sigacts = &p->p_addr->u_sigacts;
372 * Charge root for one process.
374 (void)chgproccnt(p->p_ucred->cr_uidinfo, 1, 0);
377 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL)
381 proc0_post(void *dummy __unused)
387 * Now we can look at the time, having had a chance to verify the
388 * time from the file system. Pretend that proc0 started now.
390 FOREACH_PROC_IN_SYSTEM(p) {
391 microtime(&p->p_start);
395 * Give the ``random'' number generator a thump.
396 * XXX: Does read_random() contain enough bits to be used here ?
399 srandom(ts.tv_sec ^ ts.tv_nsec);
401 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL)
404 ***************************************************************************
406 **** The following SYSINIT's and glue code should be moved to the
407 **** respective files on a per subsystem basis.
409 ***************************************************************************
414 ***************************************************************************
416 **** The following code probably belongs in another file, like
417 **** kern/init_init.c.
419 ***************************************************************************
423 * List of paths to try when searching for "init".
425 static char init_path[MAXPATHLEN] =
427 __XSTRING(INIT_PATH);
429 "/sbin/init:/sbin/oinit:/sbin/init.bak:/stand/sysinstall";
431 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, "");
434 * Start the initial user process; try exec'ing each pathname in init_path.
435 * The program is invoked with one argument containing the boot flags.
437 * The MP lock is held on entry.
440 start_init(void *dummy)
443 struct execve_args args;
445 char *var, *path, *next, *s;
446 char *ucp, **uap, *arg0, *arg1;
454 KKASSERT(p->p_nthreads == 1);
456 lp = LIST_FIRST(&p->p_lwps);
458 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */
459 mp = mountlist_boot_getfirst();
460 if (VFS_ROOT(mp, &vp))
461 panic("cannot find root vnode");
462 if (mp->mnt_ncp == NULL) {
463 mp->mnt_ncp = cache_allocroot(mp, vp);
464 cache_unlock(mp->mnt_ncp); /* leave ref intact */
466 p->p_fd->fd_cdir = vp;
467 vref(p->p_fd->fd_cdir);
468 p->p_fd->fd_rdir = vp;
469 vref(p->p_fd->fd_rdir);
470 vfs_cache_setroot(vp, cache_hold(mp->mnt_ncp));
471 VOP_UNLOCK(vp, 0); /* leave ref intact */
472 p->p_fd->fd_ncdir = cache_hold(mp->mnt_ncp);
473 p->p_fd->fd_nrdir = cache_hold(mp->mnt_ncp);
476 * Need just enough stack to hold the faked-up "execve()" arguments.
478 addr = trunc_page(USRSTACK - PAGE_SIZE);
479 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
480 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
481 panic("init: couldn't allocate argument space");
482 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
483 p->p_vmspace->vm_ssize = 1;
485 if ((var = getenv("init_path")) != NULL) {
486 strncpy(init_path, var, sizeof init_path);
487 init_path[sizeof init_path - 1] = 0;
489 if ((var = getenv("kern.fallback_elf_brand")) != NULL)
490 fallback_elf_brand = strtol(var, NULL, 0);
492 for (path = init_path; *path != '\0'; path = next) {
497 for (next = path; *next != '\0' && *next != ':'; next++)
500 printf("start_init: trying %.*s\n", (int)(next - path),
504 * Move out the boot flag argument.
507 ucp = (char *)USRSTACK;
508 (void)subyte(--ucp, 0); /* trailing zero */
509 if (boothowto & RB_SINGLE) {
510 (void)subyte(--ucp, 's');
514 if (boothowto & RB_FASTBOOT) {
515 (void)subyte(--ucp, 'f');
521 (void)subyte(--ucp, 'C');
525 (void)subyte(--ucp, '-');
526 (void)subyte(--ucp, '-'); /* leading hyphen */
530 * Move out the file name (also arg 0).
532 (void)subyte(--ucp, 0);
533 for (s = next - 1; s >= path; s--)
534 (void)subyte(--ucp, *s);
538 * Move out the arg pointers.
540 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
541 (void)suword((caddr_t)--uap, (long)0); /* terminator */
542 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
543 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
546 * Point at the arguments.
553 * Now try to exec the program. If can't for any reason
554 * other than it doesn't exist, complain.
556 * Otherwise, return via fork_trampoline() all the way
557 * to user mode as init!
559 * WARNING! We may have been moved to another cpu after
560 * acquiring the current user process designation. The
561 * MP lock will migrate with us though so we still have to
564 if ((error = execve(&args)) == 0) {
565 if (lp->lwp_thread->td_gd->gd_uschedcp != lp)
566 lp->lwp_proc->p_usched->acquire_curproc(lp);
571 printf("exec %.*s: error %d\n", (int)(next - path),
574 printf("init: not found in path %s\n", init_path);
579 * Like kthread_create(), but runs in it's own address space.
580 * We do this early to reserve pid 1.
582 * Note special case - do not make it runnable yet. Other work
583 * in progress will change this more.
586 create_init(const void *udata __unused)
591 error = fork1(&proc0.p_lwp, RFFDG | RFPROC, &initproc);
593 panic("cannot fork init: %d", error);
594 initproc->p_flag |= P_SYSTEM;
595 cpu_set_fork_handler(initproc, start_init, NULL);
598 SYSINIT(init,SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL)
601 * Make it runnable now.
604 kick_init(const void *udata __unused)
606 start_forked_proc(&proc0.p_lwp, initproc);
608 SYSINIT(kickinit,SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL)
611 * Machine independant globaldata initialization
613 * WARNING! Called from early boot, 'mycpu' may not work yet.
616 mi_gdinit(struct globaldata *gd, int cpuid)
618 TAILQ_INIT(&gd->gd_tdfreeq); /* for pmap_{new,dispose}_thread() */
619 TAILQ_INIT(&gd->gd_systimerq);
620 gd->gd_cpuid = cpuid;
621 gd->gd_cpumask = (cpumask_t)1 << cpuid;
623 vm_map_entry_reserve_cpu_init(gd);