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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11 * the permission of UNIX System Laboratories, Inc.
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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 1.20 2003/07/10 04:47:54 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>
67 #include <machine/cpu.h>
70 #include <vm/vm_param.h>
73 #include <vm/vm_map.h>
75 #include <sys/copyright.h>
77 extern struct linker_set sysinit_set; /* XXX */
79 void mi_startup(void); /* Should be elsewhere */
81 /* Components of the first process -- never freed. */
82 static struct session session0;
83 static struct pgrp pgrp0;
84 static struct procsig procsig0;
85 static struct filedesc0 filedesc0;
86 static struct plimit limit0;
87 static struct vmspace vmspace0;
88 struct proc *initproc;
90 struct thread thread0;
93 extern struct user *proc0paddr;
94 extern int fallback_elf_brand;
97 int boothowto = 0; /* initialized so that it can be patched */
98 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, "");
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_SUB_DUMMY is never
105 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL)
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.
111 struct sysinit **sysinit = (struct sysinit **)sysinit_set.ls_items;
112 struct sysinit **newsysinit;
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)
121 struct sysinit **newset;
122 struct sysinit **sipp;
123 struct sysinit **xipp;
127 for (sipp = newsysinit; *sipp; sipp++)
130 for (sipp = sysinit; *sipp; sipp++)
132 for (sipp = set; *sipp; sipp++)
134 count++; /* Trailing NULL */
135 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
137 panic("cannot malloc for sysinit");
140 for (sipp = newsysinit; *sipp; sipp++)
143 for (sipp = sysinit; *sipp; sipp++)
145 for (sipp = set; *sipp; sipp++)
149 free(newsysinit, M_TEMP);
154 * System startup; initialize the world, create process 0, mount root
155 * filesystem, and fork to create init and pagedaemon. Most of the
156 * hard work is done in the lower-level initialization routines including
157 * startup(), which does memory initialization and autoconfiguration.
159 * This allows simple addition of new kernel subsystems that require
160 * boot time initialization. It also allows substitution of subsystem
161 * (for instance, a scheduler, kernel profiler, or VM system) by object
162 * module. Finally, it allows for optional "kernel threads".
167 struct sysinit *sip; /* system initialization*/
168 struct sysinit **sipp; /* system initialization*/
169 struct sysinit **xipp; /* interior loop of sort*/
170 struct sysinit *save; /* bubble*/
174 * Perform a bubble sort of the system initialization objects by
175 * their subsystem (primary key) and order (secondary key).
177 for (sipp = sysinit; *sipp; sipp++) {
178 for (xipp = sipp + 1; *xipp; xipp++) {
179 if ((*sipp)->subsystem < (*xipp)->subsystem ||
180 ((*sipp)->subsystem == (*xipp)->subsystem &&
181 (*sipp)->order <= (*xipp)->order))
190 * Traverse the (now) ordered list of system initialization tasks.
191 * Perform each task, and continue on to the next task.
193 * The last item on the list is expected to be the scheduler,
194 * which will not return.
196 for (sipp = sysinit; (sip = *sipp) != NULL; sipp++) {
197 if (sip->subsystem == SI_SUB_DUMMY)
198 continue; /* skip dummy task(s)*/
200 if (sip->subsystem == SI_SUB_DONE)
204 (*(sip->func))(sip->udata);
206 /* Check off the one we're just done */
207 sip->subsystem = SI_SUB_DONE;
209 /* Check if we've installed more sysinit items via KLD */
210 if (newsysinit != NULL) {
211 if (sysinit != (struct sysinit **)sysinit_set.ls_items)
212 free(sysinit, M_TEMP);
213 sysinit = newsysinit;
219 panic("Shouldn't get here!");
225 ***************************************************************************
227 **** The following SYSINIT's belong elsewhere, but have not yet
230 ***************************************************************************
233 print_caddr_t(void *data __unused)
235 printf("%s", (char *)data);
237 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright)
241 ***************************************************************************
243 **** The two following SYSINT's are proc0 specific glue code. I am not
244 **** convinced that they can not be safely combined, but their order of
245 **** operation has been maintained as the same as the original init_main.c
248 **** These probably belong in init_proc.c or kern_proc.c, since they
249 **** deal with proc0 (the fork template process).
251 ***************************************************************************
255 proc0_init(void *dummy __unused)
257 register struct proc *p;
258 register struct filedesc0 *fdp;
264 * Initialize process and pgrp structures.
269 * Initialize sleep queue hash table
274 * additional VM structures
279 * Create process 0 (the swapper).
281 LIST_INSERT_HEAD(&allproc, p, p_list);
283 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
284 LIST_INIT(&pgrp0.pg_members);
285 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
287 pgrp0.pg_session = &session0;
288 session0.s_count = 1;
289 session0.s_leader = p;
291 p->p_sysent = &aout_sysvec;
293 p->p_flag = P_INMEM | P_SYSTEM | P_CP_RELEASED;
296 p->p_rtprio.type = RTP_PRIO_NORMAL;
297 p->p_rtprio.prio = 0;
302 bcopy("swapper", p->p_comm, sizeof ("swapper"));
304 /* Create credentials. */
305 p->p_ucred = crget();
306 p->p_ucred->cr_ruidinfo = uifind(0);
307 p->p_ucred->cr_ngroups = 1; /* group 0 */
308 p->p_ucred->cr_uidinfo = uifind(0);
311 p->p_ucred->cr_prison = NULL;
313 /* Create procsig. */
314 p->p_procsig = &procsig0;
315 p->p_procsig->ps_refcnt = 1;
317 /* Initialize signal state for process 0. */
320 /* Create the file descriptor table. */
322 p->p_fd = &fdp->fd_fd;
324 fdp->fd_fd.fd_refcnt = 1;
325 fdp->fd_fd.fd_cmask = cmask;
326 fdp->fd_fd.fd_ofiles = fdp->fd_dfiles;
327 fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags;
328 fdp->fd_fd.fd_nfiles = NDFILE;
330 /* Create the limits structures. */
331 p->p_limit = &limit0;
332 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++)
333 limit0.pl_rlimit[i].rlim_cur =
334 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY;
335 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur =
336 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
337 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur =
338 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
339 i = ptoa(vmstats.v_free_count);
340 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i;
341 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i;
342 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3;
343 limit0.p_cpulimit = RLIM_INFINITY;
346 /* Allocate a prototype map so we have something to fork. */
347 pmap_pinit0(vmspace_pmap(&vmspace0));
348 p->p_vmspace = &vmspace0;
349 vmspace0.vm_refcnt = 1;
350 vm_map_init(&vmspace0.vm_map, round_page(VM_MIN_ADDRESS),
351 trunc_page(VM_MAXUSER_ADDRESS));
352 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0);
355 * We continue to place resource usage info and signal
356 * actions in the user struct so they're pageable.
358 p->p_stats = &p->p_addr->u_stats;
359 p->p_sigacts = &p->p_addr->u_sigacts;
362 * Charge root for one process.
364 (void)chgproccnt(p->p_ucred->cr_uidinfo, 1, 0);
367 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL)
371 proc0_post(void *dummy __unused)
377 * Now we can look at the time, having had a chance to verify the
378 * time from the file system. Pretend that proc0 started now.
380 LIST_FOREACH(p, &allproc, p_list) {
381 microtime(&p->p_stats->p_start);
385 * Give the ``random'' number generator a thump.
386 * XXX: Does read_random() contain enough bits to be used here ?
389 srandom(ts.tv_sec ^ ts.tv_nsec);
391 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL)
394 ***************************************************************************
396 **** The following SYSINIT's and glue code should be moved to the
397 **** respective files on a per subsystem basis.
399 ***************************************************************************
404 ***************************************************************************
406 **** The following code probably belongs in another file, like
407 **** kern/init_init.c.
409 ***************************************************************************
413 * List of paths to try when searching for "init".
415 static char init_path[MAXPATHLEN] =
417 __XSTRING(INIT_PATH);
419 "/sbin/init:/sbin/oinit:/sbin/init.bak:/stand/sysinstall";
421 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, "");
424 * Start the initial user process; try exec'ing each pathname in init_path.
425 * The program is invoked with one argument containing the boot flags.
427 * The MP lock is held on entry.
430 start_init(void *dummy)
433 struct execve_args args;
435 char *var, *path, *next, *s;
436 char *ucp, **uap, *arg0, *arg1;
441 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */
442 if (VFS_ROOT(TAILQ_FIRST(&mountlist), &rootvnode))
443 panic("cannot find root vnode");
444 p->p_fd->fd_cdir = rootvnode;
445 VREF(p->p_fd->fd_cdir);
446 p->p_fd->fd_rdir = rootvnode;
447 VREF(p->p_fd->fd_rdir);
448 VOP_UNLOCK(rootvnode, 0, curthread);
451 * Need just enough stack to hold the faked-up "execve()" arguments.
453 addr = trunc_page(USRSTACK - PAGE_SIZE);
454 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
455 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
456 panic("init: couldn't allocate argument space");
457 p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
458 p->p_vmspace->vm_ssize = 1;
460 if ((var = getenv("init_path")) != NULL) {
461 strncpy(init_path, var, sizeof init_path);
462 init_path[sizeof init_path - 1] = 0;
464 if ((var = getenv("kern.fallback_elf_brand")) != NULL)
465 fallback_elf_brand = strtol(var, NULL, 0);
467 for (path = init_path; *path != '\0'; path = next) {
472 for (next = path; *next != '\0' && *next != ':'; next++)
475 printf("start_init: trying %.*s\n", (int)(next - path),
479 * Move out the boot flag argument.
482 ucp = (char *)USRSTACK;
483 (void)subyte(--ucp, 0); /* trailing zero */
484 if (boothowto & RB_SINGLE) {
485 (void)subyte(--ucp, 's');
489 if (boothowto & RB_FASTBOOT) {
490 (void)subyte(--ucp, 'f');
496 (void)subyte(--ucp, 'C');
500 (void)subyte(--ucp, '-');
501 (void)subyte(--ucp, '-'); /* leading hyphen */
505 * Move out the file name (also arg 0).
507 (void)subyte(--ucp, 0);
508 for (s = next - 1; s >= path; s--)
509 (void)subyte(--ucp, *s);
513 * Move out the arg pointers.
515 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
516 (void)suword((caddr_t)--uap, (long)0); /* terminator */
517 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
518 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
521 * Point at the arguments.
528 * Now try to exec the program. If can't for any reason
529 * other than it doesn't exist, complain.
531 * Otherwise, return via fork_trampoline() all the way
532 * to user mode as init!
534 * WARNING! We may have been moved to another cpu after
535 * acquiring P_CURPROC. The MP lock will migrate with us
536 * though so we still have to release it.
538 if ((error = execve(&args)) == 0) {
544 printf("exec %.*s: error %d\n", (int)(next - path),
547 printf("init: not found in path %s\n", init_path);
552 * Like kthread_create(), but runs in it's own address space.
553 * We do this early to reserve pid 1.
555 * Note special case - do not make it runnable yet. Other work
556 * in progress will change this more.
559 create_init(const void *udata __unused)
565 error = fork1(&proc0, RFFDG | RFPROC, &initproc);
567 panic("cannot fork init: %d\n", error);
568 initproc->p_flag |= P_INMEM | P_SYSTEM;
569 cpu_set_fork_handler(initproc, start_init, NULL);
572 SYSINIT(init,SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL)
575 * Make it runnable now.
578 kick_init(const void *udata __unused)
580 start_forked_proc(&proc0, initproc);
582 SYSINIT(kickinit,SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL)
585 * Machine independant globaldata initialization
587 * WARNING! Called from early boot, 'mycpu' may not work yet.
590 mi_gdinit(struct globaldata *gd, int cpuid)
592 TAILQ_INIT(&gd->gd_tdfreeq); /* for pmap_{new,dispose}_thread() */
593 gd->gd_cpuid = cpuid;