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
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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 1.26 2003/11/10 06:12:13 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 filedesc0 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;
96 int boothowto = 0; /* initialized so that it can be patched */
97 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, "");
100 * This ensures that there is at least one entry so that the sysinit_set
101 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
104 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL)
107 * The sysinit table itself. Items are checked off as the are run.
108 * If we want to register new sysinit types, add them to newsysinit.
110 SET_DECLARE(sysinit_set, struct sysinit);
111 struct sysinit **sysinit, **sysinit_end;
112 struct sysinit **newsysinit, **newsysinit_end;
116 * Merge a new sysinit set into the current set, reallocating it if
117 * necessary. This can only be called after malloc is running.
120 sysinit_add(struct sysinit **set, struct sysinit **set_end)
122 struct sysinit **newset;
123 struct sysinit **sipp;
124 struct sysinit **xipp;
127 count = set_end - set;
129 count += newsysinit_end - newsysinit;
131 count += sysinit_end - sysinit;
132 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
134 panic("cannot malloc for sysinit");
137 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
140 for (sipp = sysinit; sipp < sysinit_end; sipp++)
143 for (sipp = set; sipp < set_end; sipp++)
146 free(newsysinit, M_TEMP);
148 newsysinit_end = newset + count;
152 * System startup; initialize the world, create process 0, mount root
153 * filesystem, and fork to create init and pagedaemon. Most of the
154 * hard work is done in the lower-level initialization routines including
155 * startup(), which does memory initialization and autoconfiguration.
157 * This allows simple addition of new kernel subsystems that require
158 * boot time initialization. It also allows substitution of subsystem
159 * (for instance, a scheduler, kernel profiler, or VM system) by object
160 * module. Finally, it allows for optional "kernel threads".
165 struct sysinit *sip; /* system initialization*/
166 struct sysinit **sipp; /* system initialization*/
167 struct sysinit **xipp; /* interior loop of sort*/
168 struct sysinit *save; /* bubble*/
170 if (sysinit == NULL) {
171 sysinit = SET_BEGIN(sysinit_set);
172 sysinit_end = SET_LIMIT(sysinit_set);
177 * Perform a bubble sort of the system initialization objects by
178 * their subsystem (primary key) and order (secondary key).
180 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
181 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
182 if ((*sipp)->subsystem < (*xipp)->subsystem ||
183 ((*sipp)->subsystem == (*xipp)->subsystem &&
184 (*sipp)->order <= (*xipp)->order))
193 * Traverse the (now) ordered list of system initialization tasks.
194 * Perform each task, and continue on to the next task.
196 * The last item on the list is expected to be the scheduler,
197 * which will not return.
199 for (sipp = sysinit; sipp < sysinit_end; sipp++) {
201 if (sip->subsystem == SI_SUB_DUMMY)
202 continue; /* skip dummy task(s)*/
204 if (sip->subsystem == SI_SUB_DONE)
208 (*(sip->func))(sip->udata);
210 /* Check off the one we're just done */
211 sip->subsystem = SI_SUB_DONE;
213 /* Check if we've installed more sysinit items via KLD */
214 if (newsysinit != NULL) {
215 if (sysinit != SET_BEGIN(sysinit_set))
216 free(sysinit, M_TEMP);
217 sysinit = newsysinit;
218 sysinit_end = newsysinit_end;
220 newsysinit_end = NULL;
225 panic("Shouldn't get here!");
231 ***************************************************************************
233 **** The following SYSINIT's belong elsewhere, but have not yet
236 ***************************************************************************
239 print_caddr_t(void *data __unused)
241 printf("%s", (char *)data);
243 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright)
246 * Leave the critical section that protected us from spurious interrupts
247 * so device probes work.
250 leavecrit(void *dummy __unused)
253 KKASSERT(!IN_CRITICAL_SECT(curthread));
255 printf("Leaving critical section, allowing interrupts\n");
257 SYSINIT(leavecrit, SI_SUB_LEAVE_CRIT, SI_ORDER_ANY, leavecrit, NULL)
260 ***************************************************************************
262 **** The two following SYSINT's are proc0 specific glue code. I am not
263 **** convinced that they can not be safely combined, but their order of
264 **** operation has been maintained as the same as the original init_main.c
267 **** These probably belong in init_proc.c or kern_proc.c, since they
268 **** deal with proc0 (the fork template process).
270 ***************************************************************************
274 proc0_init(void *dummy __unused)
277 struct filedesc0 *fdp;
283 * Initialize process and pgrp structures.
288 * Initialize sleep queue hash table
293 * additional VM structures
298 * Create process 0 (the swapper).
300 LIST_INSERT_HEAD(&allproc, p, p_list);
302 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
303 LIST_INIT(&pgrp0.pg_members);
304 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
306 pgrp0.pg_session = &session0;
307 session0.s_count = 1;
308 session0.s_leader = p;
310 p->p_sysent = &aout_sysvec;
312 p->p_flag = P_INMEM | P_SYSTEM | P_CP_RELEASED;
315 p->p_rtprio.type = RTP_PRIO_NORMAL;
316 p->p_rtprio.prio = 0;
321 bcopy("swapper", p->p_comm, sizeof ("swapper"));
323 /* Create credentials. */
324 p->p_ucred = crget();
325 p->p_ucred->cr_ruidinfo = uifind(0);
326 p->p_ucred->cr_ngroups = 1; /* group 0 */
327 p->p_ucred->cr_uidinfo = uifind(0);
330 p->p_ucred->cr_prison = NULL;
332 /* Create procsig. */
333 p->p_procsig = &procsig0;
334 p->p_procsig->ps_refcnt = 1;
336 /* Initialize signal state for process 0. */
339 /* Create the file descriptor table. */
341 p->p_fd = &fdp->fd_fd;
343 fdp->fd_fd.fd_refcnt = 1;
344 fdp->fd_fd.fd_cmask = cmask;
345 fdp->fd_fd.fd_ofiles = fdp->fd_dfiles;
346 fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags;
347 fdp->fd_fd.fd_nfiles = NDFILE;
349 /* Create the limits structures. */
350 p->p_limit = &limit0;
351 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++)
352 limit0.pl_rlimit[i].rlim_cur =
353 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY;
354 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur =
355 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
356 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur =
357 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
358 i = ptoa(vmstats.v_free_count);
359 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i;
360 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i;
361 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3;
362 limit0.p_cpulimit = RLIM_INFINITY;
365 /* Allocate a prototype map so we have something to fork. */
366 pmap_pinit0(vmspace_pmap(&vmspace0));
367 p->p_vmspace = &vmspace0;
368 vmspace0.vm_refcnt = 1;
369 vm_map_init(&vmspace0.vm_map, round_page(VM_MIN_ADDRESS),
370 trunc_page(VM_MAXUSER_ADDRESS));
371 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0);
374 * We continue to place resource usage info and signal
375 * actions in the user struct so they're pageable.
377 p->p_stats = &p->p_addr->u_stats;
378 p->p_sigacts = &p->p_addr->u_sigacts;
381 * Charge root for one process.
383 (void)chgproccnt(p->p_ucred->cr_uidinfo, 1, 0);
386 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL)
390 proc0_post(void *dummy __unused)
396 * Now we can look at the time, having had a chance to verify the
397 * time from the file system. Pretend that proc0 started now.
399 FOREACH_PROC_IN_SYSTEM(p) {
400 microtime(&p->p_stats->p_start);
404 * Give the ``random'' number generator a thump.
405 * XXX: Does read_random() contain enough bits to be used here ?
408 srandom(ts.tv_sec ^ ts.tv_nsec);
410 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL)
413 ***************************************************************************
415 **** The following SYSINIT's and glue code should be moved to the
416 **** respective files on a per subsystem basis.
418 ***************************************************************************
423 ***************************************************************************
425 **** The following code probably belongs in another file, like
426 **** kern/init_init.c.
428 ***************************************************************************
432 * List of paths to try when searching for "init".
434 static char init_path[MAXPATHLEN] =
436 __XSTRING(INIT_PATH);
438 "/sbin/init:/sbin/oinit:/sbin/init.bak:/stand/sysinstall";
440 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, "");
443 * Start the initial user process; try exec'ing each pathname in init_path.
444 * The program is invoked with one argument containing the boot flags.
446 * The MP lock is held on entry.
449 start_init(void *dummy)
452 struct execve_args args;
454 char *var, *path, *next, *s;
455 char *ucp, **uap, *arg0, *arg1;
460 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */
461 if (VFS_ROOT(TAILQ_FIRST(&mountlist), &rootvnode))
462 panic("cannot find root vnode");
463 p->p_fd->fd_cdir = rootvnode;
464 VREF(p->p_fd->fd_cdir);
465 p->p_fd->fd_rdir = rootvnode;
466 VREF(p->p_fd->fd_rdir);
467 vfs_cache_setroot(rootvnode);
468 VOP_UNLOCK(rootvnode, 0, curthread);
471 * Need just enough stack to hold the faked-up "execve()" arguments.
473 addr = trunc_page(USRSTACK - PAGE_SIZE);
474 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
475 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
476 panic("init: couldn't allocate argument space");
477 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
478 p->p_vmspace->vm_ssize = 1;
480 if ((var = getenv("init_path")) != NULL) {
481 strncpy(init_path, var, sizeof init_path);
482 init_path[sizeof init_path - 1] = 0;
484 if ((var = getenv("kern.fallback_elf_brand")) != NULL)
485 fallback_elf_brand = strtol(var, NULL, 0);
487 for (path = init_path; *path != '\0'; path = next) {
492 for (next = path; *next != '\0' && *next != ':'; next++)
495 printf("start_init: trying %.*s\n", (int)(next - path),
499 * Move out the boot flag argument.
502 ucp = (char *)USRSTACK;
503 (void)subyte(--ucp, 0); /* trailing zero */
504 if (boothowto & RB_SINGLE) {
505 (void)subyte(--ucp, 's');
509 if (boothowto & RB_FASTBOOT) {
510 (void)subyte(--ucp, 'f');
516 (void)subyte(--ucp, 'C');
520 (void)subyte(--ucp, '-');
521 (void)subyte(--ucp, '-'); /* leading hyphen */
525 * Move out the file name (also arg 0).
527 (void)subyte(--ucp, 0);
528 for (s = next - 1; s >= path; s--)
529 (void)subyte(--ucp, *s);
533 * Move out the arg pointers.
535 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
536 (void)suword((caddr_t)--uap, (long)0); /* terminator */
537 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
538 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
541 * Point at the arguments.
548 * Now try to exec the program. If can't for any reason
549 * other than it doesn't exist, complain.
551 * Otherwise, return via fork_trampoline() all the way
552 * to user mode as init!
554 * WARNING! We may have been moved to another cpu after
555 * acquiring P_CURPROC. The MP lock will migrate with us
556 * though so we still have to release it.
558 if ((error = execve(&args)) == 0) {
564 printf("exec %.*s: error %d\n", (int)(next - path),
567 printf("init: not found in path %s\n", init_path);
572 * Like kthread_create(), but runs in it's own address space.
573 * We do this early to reserve pid 1.
575 * Note special case - do not make it runnable yet. Other work
576 * in progress will change this more.
579 create_init(const void *udata __unused)
585 error = fork1(&proc0, RFFDG | RFPROC, &initproc);
587 panic("cannot fork init: %d\n", error);
588 initproc->p_flag |= P_INMEM | P_SYSTEM;
589 cpu_set_fork_handler(initproc, start_init, NULL);
592 SYSINIT(init,SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL)
595 * Make it runnable now.
598 kick_init(const void *udata __unused)
600 start_forked_proc(&proc0, initproc);
602 SYSINIT(kickinit,SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL)
605 * Machine independant globaldata initialization
607 * WARNING! Called from early boot, 'mycpu' may not work yet.
610 mi_gdinit(struct globaldata *gd, int cpuid)
612 TAILQ_INIT(&gd->gd_tdfreeq); /* for pmap_{new,dispose}_thread() */
613 gd->gd_cpuid = cpuid;