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
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.
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22 * must display the following acknowledgement:
23 * This product includes software developed by the University of
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26 * may be used to endorse or promote products derived from this software
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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 1.64 2006/09/19 11:47:35 corecode 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 = kmalloc(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 kfree(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 kfree(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)
279 lp = &proc0.p_lwp; /* XXX lwp to be: lwp0 */
282 * Initialize process and pgrp structures.
287 * additional VM structures
292 * Create process 0 (the swapper).
294 LIST_INSERT_HEAD(&allproc, p, p_list);
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);
300 pgrp0.pg_session = &session0;
301 session0.s_count = 1;
302 session0.s_leader = p;
304 p->p_sysent = &aout_sysvec;
306 p->p_flag = P_SYSTEM;
309 p->p_rtprio.type = RTP_PRIO_NORMAL;
310 p->p_rtprio.prio = 0;
311 p->p_lwp.lwp_rtprio = p->p_rtprio;
316 bcopy("swapper", p->p_comm, sizeof ("swapper"));
317 bcopy("swapper", thread0.td_comm, sizeof ("swapper"));
319 /* Create credentials. */
320 p->p_ucred = crget();
321 p->p_ucred->cr_ruidinfo = uifind(0);
322 p->p_ucred->cr_ngroups = 1; /* group 0 */
323 p->p_ucred->cr_uidinfo = uifind(0);
326 p->p_ucred->cr_prison = NULL;
328 /* Create procsig. */
329 p->p_procsig = &procsig0;
330 p->p_procsig->ps_refcnt = 1;
332 /* Initialize signal state for process 0. */
335 /* Create the file descriptor table. */
336 fdinit_bootstrap(p, &filedesc0, cmask);
338 /* Create the limits structures. */
339 plimit_init0(&limit0);
340 p->p_limit = &limit0;
342 /* Allocate a prototype map so we have something to fork. */
343 pmap_pinit0(vmspace_pmap(&vmspace0));
344 p->p_vmspace = &vmspace0;
345 vmspace0.vm_refcnt = 1;
346 vm_map_init(&vmspace0.vm_map, round_page(VM_MIN_ADDRESS),
347 trunc_page(VM_MAXUSER_ADDRESS));
348 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0);
351 * We continue to place resource usage info and signal
352 * actions in the user struct so they're pageable.
354 p->p_stats = &p->p_addr->u_stats;
355 p->p_sigacts = &p->p_addr->u_sigacts;
358 * Charge root for one process.
360 (void)chgproccnt(p->p_ucred->cr_uidinfo, 1, 0);
363 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL)
365 static int proc0_post_callback(struct proc *p, void *data __unused);
369 proc0_post(void *dummy __unused)
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.
377 allproc_scan(proc0_post_callback, NULL);
380 * Give the ``random'' number generator a thump.
381 * XXX: Does read_random() contain enough bits to be used here ?
384 skrandom(ts.tv_sec ^ ts.tv_nsec);
388 proc0_post_callback(struct proc *p, void *data __unused)
390 microtime(&p->p_start);
394 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL)
397 ***************************************************************************
399 **** The following SYSINIT's and glue code should be moved to the
400 **** respective files on a per subsystem basis.
402 ***************************************************************************
407 ***************************************************************************
409 **** The following code probably belongs in another file, like
410 **** kern/init_init.c.
412 ***************************************************************************
416 * List of paths to try when searching for "init".
418 static char init_path[MAXPATHLEN] =
420 __XSTRING(INIT_PATH);
422 "/sbin/init:/sbin/oinit:/sbin/init.bak:/stand/sysinstall";
424 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, "");
427 * Start the initial user process; try exec'ing each pathname in init_path.
428 * The program is invoked with one argument containing the boot flags.
430 * The MP lock is held on entry.
433 start_init(void *dummy)
436 struct execve_args args;
438 char *var, *path, *next, *s;
439 char *ucp, **uap, *arg0, *arg1;
447 KKASSERT(p->p_nthreads == 1);
449 lp = LIST_FIRST(&p->p_lwps);
451 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */
452 mp = mountlist_boot_getfirst();
453 if (VFS_ROOT(mp, &vp))
454 panic("cannot find root vnode");
455 if (mp->mnt_ncp == NULL) {
456 mp->mnt_ncp = cache_allocroot(mp, vp);
457 cache_unlock(mp->mnt_ncp); /* leave ref intact */
459 p->p_fd->fd_cdir = vp;
460 vref(p->p_fd->fd_cdir);
461 p->p_fd->fd_rdir = vp;
462 vref(p->p_fd->fd_rdir);
463 vfs_cache_setroot(vp, cache_hold(mp->mnt_ncp));
464 vn_unlock(vp); /* leave ref intact */
465 p->p_fd->fd_ncdir = cache_hold(mp->mnt_ncp);
466 p->p_fd->fd_nrdir = cache_hold(mp->mnt_ncp);
469 * Need just enough stack to hold the faked-up "execve()" arguments.
471 addr = trunc_page(USRSTACK - PAGE_SIZE);
472 error = vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
475 VM_PROT_ALL, VM_PROT_ALL,
478 panic("init: couldn't allocate argument space");
479 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
480 p->p_vmspace->vm_ssize = 1;
482 if ((var = kgetenv("init_path")) != NULL) {
483 strncpy(init_path, var, sizeof init_path);
484 init_path[sizeof init_path - 1] = 0;
486 if ((var = kgetenv("kern.fallback_elf_brand")) != NULL)
487 fallback_elf_brand = strtol(var, NULL, 0);
489 for (path = init_path; *path != '\0'; path = next) {
494 for (next = path; *next != '\0' && *next != ':'; next++)
497 printf("start_init: trying %.*s\n", (int)(next - path),
501 * Move out the boot flag argument.
504 ucp = (char *)USRSTACK;
505 (void)subyte(--ucp, 0); /* trailing zero */
506 if (boothowto & RB_SINGLE) {
507 (void)subyte(--ucp, 's');
511 if (boothowto & RB_FASTBOOT) {
512 (void)subyte(--ucp, 'f');
518 (void)subyte(--ucp, 'C');
522 (void)subyte(--ucp, '-');
523 (void)subyte(--ucp, '-'); /* leading hyphen */
527 * Move out the file name (also arg 0).
529 (void)subyte(--ucp, 0);
530 for (s = next - 1; s >= path; s--)
531 (void)subyte(--ucp, *s);
535 * Move out the arg pointers.
537 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
538 (void)suword((caddr_t)--uap, (long)0); /* terminator */
539 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
540 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
543 * Point at the arguments.
550 * Now try to exec the program. If can't for any reason
551 * other than it doesn't exist, complain.
553 * Otherwise, return via fork_trampoline() all the way
554 * to user mode as init!
556 * WARNING! We may have been moved to another cpu after
557 * acquiring the current user process designation. The
558 * MP lock will migrate with us though so we still have to
561 if ((error = sys_execve(&args)) == 0) {
563 lp->lwp_proc->p_usched->acquire_curproc(lp);
567 printf("exec %.*s: error %d\n", (int)(next - path),
570 printf("init: not found in path %s\n", init_path);
575 * Like kthread_create(), but runs in it's own address space.
576 * We do this early to reserve pid 1.
578 * Note special case - do not make it runnable yet. Other work
579 * in progress will change this more.
582 create_init(const void *udata __unused)
588 error = fork1(&proc0.p_lwp, RFFDG | RFPROC, &initproc);
590 panic("cannot fork init: %d", error);
591 initproc->p_flag |= P_SYSTEM;
592 lp = LIST_FIRST(&initproc->p_lwps);
593 cpu_set_fork_handler(lp, start_init, NULL);
596 SYSINIT(init,SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL)
599 * Make it runnable now.
602 kick_init(const void *udata __unused)
604 start_forked_proc(&proc0.p_lwp, initproc);
606 SYSINIT(kickinit,SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL)
609 * Machine independant globaldata initialization
611 * WARNING! Called from early boot, 'mycpu' may not work yet.
614 mi_gdinit(struct globaldata *gd, int cpuid)
616 TAILQ_INIT(&gd->gd_tdfreeq); /* for pmap_{new,dispose}_thread() */
617 TAILQ_INIT(&gd->gd_systimerq);
618 gd->gd_cpuid = cpuid;
619 gd->gd_cpumask = (cpumask_t)1 << cpuid;
621 vm_map_entry_reserve_cpu_init(gd);