source: rtems-libbsd/freebsd/sys/kern/init_main.c @ 2815cdb

4.115-freebsd-12freebsd-9.3
Last change on this file since 2815cdb was 2815cdb, checked in by Sebastian Huber <sebastian.huber@…>, on Dec 2, 2013 at 2:36:31 PM

Changes due to <sys/cpuset.h> from latest Newlib

  • Property mode set to 100644
File size: 23.4 KB
Line 
1#include <machine/rtems-bsd-kernel-space.h>
2
3/*-
4 * Copyright (c) 1995 Terrence R. Lambert
5 * All rights reserved.
6 *
7 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993
8 *      The Regents of the University of California.  All rights reserved.
9 * (c) UNIX System Laboratories, Inc.
10 * All or some portions of this file are derived from material licensed
11 * to the University of California by American Telephone and Telegraph
12 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
13 * the permission of UNIX System Laboratories, Inc.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 *    notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 *    notice, this list of conditions and the following disclaimer in the
22 *    documentation and/or other materials provided with the distribution.
23 * 3. All advertising materials mentioning features or use of this software
24 *    must display the following acknowledgement:
25 *      This product includes software developed by the University of
26 *      California, Berkeley and its contributors.
27 * 4. Neither the name of the University nor the names of its contributors
28 *    may be used to endorse or promote products derived from this software
29 *    without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * SUCH DAMAGE.
42 *
43 *      @(#)init_main.c 8.9 (Berkeley) 1/21/94
44 */
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD$");
48
49#include <rtems/bsd/local/opt_ddb.h>
50#include <rtems/bsd/local/opt_init_path.h>
51
52#include <rtems/bsd/sys/param.h>
53#include <sys/kernel.h>
54#include <sys/exec.h>
55#include <sys/file.h>
56#include <sys/filedesc.h>
57#include <sys/jail.h>
58#include <sys/ktr.h>
59#include <rtems/bsd/sys/lock.h>
60#include <sys/loginclass.h>
61#include <sys/mount.h>
62#include <sys/mutex.h>
63#include <sys/syscallsubr.h>
64#include <sys/sysctl.h>
65#include <sys/proc.h>
66#include <sys/racct.h>
67#include <sys/resourcevar.h>
68#include <sys/systm.h>
69#include <sys/signalvar.h>
70#include <sys/vnode.h>
71#include <sys/sysent.h>
72#include <sys/reboot.h>
73#include <sys/sched.h>
74#include <sys/sx.h>
75#include <sys/sysproto.h>
76#include <sys/vmmeter.h>
77#include <rtems/bsd/sys/unistd.h>
78#include <sys/malloc.h>
79#include <sys/conf.h>
80#include <rtems/bsd/sys/cpuset.h>
81
82#include <machine/cpu.h>
83
84#include <security/audit/audit.h>
85#include <security/mac/mac_framework.h>
86
87#include <vm/vm.h>
88#include <vm/vm_param.h>
89#include <vm/pmap.h>
90#include <vm/vm_map.h>
91#include <sys/copyright.h>
92
93#include <ddb/ddb.h>
94#include <ddb/db_sym.h>
95
96void mi_startup(void);                          /* Should be elsewhere */
97
98#ifndef __rtems__
99/* Components of the first process -- never freed. */
100static struct session session0;
101static struct pgrp pgrp0;
102struct  proc proc0;
103struct  thread thread0 __aligned(16);
104struct  vmspace vmspace0;
105struct  proc *initproc;
106
107int     boothowto = 0;          /* initialized so that it can be patched */
108SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
109        "Boot control flags, passed from loader");
110int     bootverbose;
111SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
112        "Control the output of verbose kernel messages");
113
114/*
115 * This ensures that there is at least one entry so that the sysinit_set
116 * symbol is not undefined.  A sybsystem ID of SI_SUB_DUMMY is never
117 * executed.
118 */
119SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
120
121/*
122 * The sysinit table itself.  Items are checked off as the are run.
123 * If we want to register new sysinit types, add them to newsysinit.
124 */
125#endif /* __rtems__ */
126SET_DECLARE(sysinit_set, struct sysinit);
127#ifndef __rtems__
128struct sysinit **sysinit, **sysinit_end;
129struct sysinit **newsysinit, **newsysinit_end;
130
131/*
132 * Merge a new sysinit set into the current set, reallocating it if
133 * necessary.  This can only be called after malloc is running.
134 */
135void
136sysinit_add(struct sysinit **set, struct sysinit **set_end)
137{
138        struct sysinit **newset;
139        struct sysinit **sipp;
140        struct sysinit **xipp;
141        int count;
142
143        count = set_end - set;
144        if (newsysinit)
145                count += newsysinit_end - newsysinit;
146        else
147                count += sysinit_end - sysinit;
148        newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
149        if (newset == NULL)
150                panic("cannot malloc for sysinit");
151        xipp = newset;
152        if (newsysinit)
153                for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
154                        *xipp++ = *sipp;
155        else
156                for (sipp = sysinit; sipp < sysinit_end; sipp++)
157                        *xipp++ = *sipp;
158        for (sipp = set; sipp < set_end; sipp++)
159                *xipp++ = *sipp;
160        if (newsysinit)
161                free(newsysinit, M_TEMP);
162        newsysinit = newset;
163        newsysinit_end = newset + count;
164}
165#endif /* __rtems__ */
166
167#if defined (DDB) && defined(VERBOSE_SYSINIT)
168static const char *
169symbol_name(vm_offset_t va, db_strategy_t strategy)
170{
171        const char *name;
172        c_db_sym_t sym;
173        db_expr_t  offset;
174
175        if (va == 0)
176                return (NULL);
177        sym = db_search_symbol(va, strategy, &offset);
178        if (offset != 0)
179                return (NULL);
180        db_symbol_values(sym, &name, NULL);
181        return (name);
182}
183#endif
184
185/*
186 * System startup; initialize the world, create process 0, mount root
187 * filesystem, and fork to create init and pagedaemon.  Most of the
188 * hard work is done in the lower-level initialization routines including
189 * startup(), which does memory initialization and autoconfiguration.
190 *
191 * This allows simple addition of new kernel subsystems that require
192 * boot time initialization.  It also allows substitution of subsystem
193 * (for instance, a scheduler, kernel profiler, or VM system) by object
194 * module.  Finally, it allows for optional "kernel threads".
195 */
196void
197mi_startup(void)
198{
199
200        register struct sysinit **sipp;         /* system initialization*/
201        register struct sysinit **xipp;         /* interior loop of sort*/
202        register struct sysinit *save;          /* bubble*/
203#ifdef __rtems__
204        struct sysinit **sysinit = NULL;
205        struct sysinit **sysinit_end = NULL;
206#endif /* __rtems__ */
207
208#if defined(VERBOSE_SYSINIT)
209        int last;
210        int verbose;
211#endif
212
213#ifndef __rtems__
214        if (boothowto & RB_VERBOSE)
215                bootverbose++;
216#endif /* __rtems__ */
217
218        if (sysinit == NULL) {
219                sysinit = SET_BEGIN(sysinit_set);
220                sysinit_end = SET_LIMIT(sysinit_set);
221        }
222
223#ifndef __rtems__
224restart:
225#endif /* __rtems__ */
226        /*
227         * Perform a bubble sort of the system initialization objects by
228         * their subsystem (primary key) and order (secondary key).
229         */
230        for (sipp = sysinit; sipp < sysinit_end; sipp++) {
231                for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
232                        if ((*sipp)->subsystem < (*xipp)->subsystem ||
233                             ((*sipp)->subsystem == (*xipp)->subsystem &&
234                              (*sipp)->order <= (*xipp)->order))
235                                continue;       /* skip*/
236                        save = *sipp;
237                        *sipp = *xipp;
238                        *xipp = save;
239                }
240        }
241
242#if defined(VERBOSE_SYSINIT)
243        last = SI_SUB_COPYRIGHT;
244        verbose = 0;
245#if !defined(DDB)
246        printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
247#endif
248#endif
249
250        /*
251         * Traverse the (now) ordered list of system initialization tasks.
252         * Perform each task, and continue on to the next task.
253         *
254         * The last item on the list is expected to be the scheduler,
255         * which will not return.
256         */
257        for (sipp = sysinit; sipp < sysinit_end; sipp++) {
258
259                if ((*sipp)->subsystem == SI_SUB_DUMMY)
260                        continue;       /* skip dummy task(s)*/
261
262                if ((*sipp)->subsystem == SI_SUB_DONE)
263                        continue;
264
265#if defined(VERBOSE_SYSINIT)
266                if ((*sipp)->subsystem > last) {
267                        verbose = 1;
268                        last = (*sipp)->subsystem;
269                        printf("subsystem %x\n", last);
270                }
271                if (verbose) {
272#if defined(DDB)
273                        const char *func, *data;
274
275                        func = symbol_name((vm_offset_t)(*sipp)->func,
276                            DB_STGY_PROC);
277                        data = symbol_name((vm_offset_t)(*sipp)->udata,
278                            DB_STGY_ANY);
279                        if (func != NULL && data != NULL)
280                                printf("   %s(&%s)... ", func, data);
281                        else if (func != NULL)
282                                printf("   %s(%p)... ", func, (*sipp)->udata);
283                        else
284#endif
285                                printf("   %p(%p)... ", (*sipp)->func,
286                                    (*sipp)->udata);
287                }
288#endif
289
290                /* Call function */
291                (*((*sipp)->func))((*sipp)->udata);
292
293#if defined(VERBOSE_SYSINIT)
294                if (verbose)
295                        printf("done.\n");
296#endif
297
298                /* Check off the one we're just done */
299                (*sipp)->subsystem = SI_SUB_DONE;
300
301#ifndef __rtems__
302                /* Check if we've installed more sysinit items via KLD */
303                if (newsysinit != NULL) {
304                        if (sysinit != SET_BEGIN(sysinit_set))
305                                free(sysinit, M_TEMP);
306                        sysinit = newsysinit;
307                        sysinit_end = newsysinit_end;
308                        newsysinit = NULL;
309                        newsysinit_end = NULL;
310                        goto restart;
311                }
312#endif /* __rtems__ */
313        }
314
315#ifndef __rtems__
316        panic("Shouldn't get here!");
317        /* NOTREACHED*/
318#endif /* __rtems__ */
319}
320
321
322#ifndef __rtems__
323/*
324 ***************************************************************************
325 ****
326 **** The following SYSINIT's belong elsewhere, but have not yet
327 **** been moved.
328 ****
329 ***************************************************************************
330 */
331static void
332print_caddr_t(void *data)
333{
334        printf("%s", (char *)data);
335}
336
337static void
338print_version(void *data __unused)
339{
340        int len;
341
342        /* Strip a trailing newline from version. */
343        len = strlen(version);
344        while (len > 0 && version[len - 1] == '\n')
345                len--;
346        printf("%.*s %s\n", len, version, machine);
347        printf("%s\n", compiler_version);
348}
349
350SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
351    copyright);
352SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
353    trademark);
354SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
355
356#ifdef WITNESS
357static char wit_warn[] =
358     "WARNING: WITNESS option enabled, expect reduced performance.\n";
359SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
360   print_caddr_t, wit_warn);
361SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1,
362   print_caddr_t, wit_warn);
363#endif
364
365#ifdef DIAGNOSTIC
366static char diag_warn[] =
367     "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
368SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
369    print_caddr_t, diag_warn);
370SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2,
371    print_caddr_t, diag_warn);
372#endif
373
374static int
375null_fetch_syscall_args(struct thread *td __unused,
376    struct syscall_args *sa __unused)
377{
378
379        panic("null_fetch_syscall_args");
380}
381
382static void
383null_set_syscall_retval(struct thread *td __unused, int error __unused)
384{
385
386        panic("null_set_syscall_retval");
387}
388
389struct sysentvec null_sysvec = {
390        .sv_size        = 0,
391        .sv_table       = NULL,
392        .sv_mask        = 0,
393        .sv_sigsize     = 0,
394        .sv_sigtbl      = NULL,
395        .sv_errsize     = 0,
396        .sv_errtbl      = NULL,
397        .sv_transtrap   = NULL,
398        .sv_fixup       = NULL,
399        .sv_sendsig     = NULL,
400        .sv_sigcode     = NULL,
401        .sv_szsigcode   = NULL,
402        .sv_prepsyscall = NULL,
403        .sv_name        = "null",
404        .sv_coredump    = NULL,
405        .sv_imgact_try  = NULL,
406        .sv_minsigstksz = 0,
407        .sv_pagesize    = PAGE_SIZE,
408        .sv_minuser     = VM_MIN_ADDRESS,
409        .sv_maxuser     = VM_MAXUSER_ADDRESS,
410        .sv_usrstack    = USRSTACK,
411        .sv_psstrings   = PS_STRINGS,
412        .sv_stackprot   = VM_PROT_ALL,
413        .sv_copyout_strings     = NULL,
414        .sv_setregs     = NULL,
415        .sv_fixlimit    = NULL,
416        .sv_maxssiz     = NULL,
417        .sv_flags       = 0,
418        .sv_set_syscall_retval = null_set_syscall_retval,
419        .sv_fetch_syscall_args = null_fetch_syscall_args,
420        .sv_syscallnames = NULL,
421        .sv_schedtail   = NULL,
422};
423#endif /* __rtems__ */
424
425/*
426 ***************************************************************************
427 ****
428 **** The two following SYSINIT's are proc0 specific glue code.  I am not
429 **** convinced that they can not be safely combined, but their order of
430 **** operation has been maintained as the same as the original init_main.c
431 **** for right now.
432 ****
433 **** These probably belong in init_proc.c or kern_proc.c, since they
434 **** deal with proc0 (the fork template process).
435 ****
436 ***************************************************************************
437 */
438/* ARGSUSED*/
439static void
440proc0_init(void *dummy __unused)
441{
442#ifndef __rtems__
443        struct proc *p;
444        struct thread *td;
445        vm_paddr_t pageablemem;
446        int i;
447
448        GIANT_REQUIRED;
449        p = &proc0;
450        td = &thread0;
451       
452        /*
453         * Initialize magic number and osrel.
454         */
455        p->p_magic = P_MAGIC;
456        p->p_osrel = osreldate;
457
458        /*
459         * Initialize thread and process structures.
460         */
461        procinit();     /* set up proc zone */
462        threadinit();   /* set up UMA zones */
463
464        /*
465         * Initialise scheduler resources.
466         * Add scheduler specific parts to proc, thread as needed.
467         */
468        schedinit();    /* scheduler gets its house in order */
469        /*
470         * Initialize sleep queue hash table
471         */
472        sleepinit();
473
474        /*
475         * additional VM structures
476         */
477        vm_init2();
478
479        /*
480         * Create process 0 (the swapper).
481         */
482        LIST_INSERT_HEAD(&allproc, p, p_list);
483        LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
484        mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
485        p->p_pgrp = &pgrp0;
486        LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
487        LIST_INIT(&pgrp0.pg_members);
488        LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
489
490        pgrp0.pg_session = &session0;
491        mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
492        refcount_init(&session0.s_count, 1);
493        session0.s_leader = p;
494
495        p->p_sysent = &null_sysvec;
496        p->p_flag = P_SYSTEM | P_INMEM;
497        p->p_state = PRS_NORMAL;
498        knlist_init_mtx(&p->p_klist, &p->p_mtx);
499        STAILQ_INIT(&p->p_ktr);
500        p->p_nice = NZERO;
501        /* pid_max cannot be greater than PID_MAX */
502        td->td_tid = PID_MAX + 1;
503        LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash);
504        td->td_state = TDS_RUNNING;
505        td->td_pri_class = PRI_TIMESHARE;
506        td->td_user_pri = PUSER;
507        td->td_base_user_pri = PUSER;
508        td->td_lend_user_pri = PRI_MAX;
509        td->td_priority = PVM;
510        td->td_base_pri = PVM;
511        td->td_oncpu = 0;
512        td->td_flags = TDF_INMEM|TDP_KTHREAD;
513        td->td_cpuset = cpuset_thread0();
514        prison0.pr_cpuset = cpuset_ref(td->td_cpuset);
515        p->p_peers = 0;
516        p->p_leader = p;
517
518
519        strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
520        strncpy(td->td_name, "swapper", sizeof (td->td_name));
521
522        callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
523        callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
524        callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
525
526        /* Create credentials. */
527        p->p_ucred = crget();
528        p->p_ucred->cr_ngroups = 1;     /* group 0 */
529        p->p_ucred->cr_uidinfo = uifind(0);
530        p->p_ucred->cr_ruidinfo = uifind(0);
531        p->p_ucred->cr_prison = &prison0;
532        p->p_ucred->cr_loginclass = loginclass_find("default");
533#ifdef AUDIT
534        audit_cred_kproc0(p->p_ucred);
535#endif
536#ifdef MAC
537        mac_cred_create_swapper(p->p_ucred);
538#endif
539        td->td_ucred = crhold(p->p_ucred);
540
541        /* Create sigacts. */
542        p->p_sigacts = sigacts_alloc();
543
544        /* Initialize signal state for process 0. */
545        siginit(&proc0);
546
547        /* Create the file descriptor table. */
548        p->p_fd = fdinit(NULL);
549        p->p_fdtol = NULL;
550
551        /* Create the limits structures. */
552        p->p_limit = lim_alloc();
553        for (i = 0; i < RLIM_NLIMITS; i++)
554                p->p_limit->pl_rlimit[i].rlim_cur =
555                    p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
556        p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
557            p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
558        p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
559            p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
560        p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
561        p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
562        p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
563        p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
564        /* Cast to avoid overflow on i386/PAE. */
565        pageablemem = ptoa((vm_paddr_t)cnt.v_free_count);
566        p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
567            p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
568        p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
569        p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
570        p->p_cpulimit = RLIM_INFINITY;
571
572        /* Initialize resource accounting structures. */
573        racct_create(&p->p_racct);
574
575        p->p_stats = pstats_alloc();
576
577        /* Allocate a prototype map so we have something to fork. */
578        pmap_pinit0(vmspace_pmap(&vmspace0));
579        p->p_vmspace = &vmspace0;
580        vmspace0.vm_refcnt = 1;
581
582        /*
583         * proc0 is not expected to enter usermode, so there is no special
584         * handling for sv_minuser here, like is done for exec_new_vmspace().
585         */
586        vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
587            p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
588
589        /*
590         * Call the init and ctor for the new thread and proc.  We wait
591         * to do this until all other structures are fairly sane.
592         */
593        EVENTHANDLER_INVOKE(process_init, p);
594        EVENTHANDLER_INVOKE(thread_init, td);
595        EVENTHANDLER_INVOKE(process_ctor, p);
596        EVENTHANDLER_INVOKE(thread_ctor, td);
597
598        /*
599         * Charge root for one process.
600         */
601        (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
602        PROC_LOCK(p);
603        racct_add_force(p, RACCT_NPROC, 1);
604        PROC_UNLOCK(p);
605#endif /* __rtems__ */
606}
607SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
608
609#ifndef __rtems__
610/* ARGSUSED*/
611static void
612proc0_post(void *dummy __unused)
613{
614        struct timespec ts;
615        struct proc *p;
616        struct rusage ru;
617        struct thread *td;
618
619        /*
620         * Now we can look at the time, having had a chance to verify the
621         * time from the filesystem.  Pretend that proc0 started now.
622         */
623        sx_slock(&allproc_lock);
624        FOREACH_PROC_IN_SYSTEM(p) {
625                microuptime(&p->p_stats->p_start);
626                PROC_SLOCK(p);
627                rufetch(p, &ru);        /* Clears thread stats */
628                PROC_SUNLOCK(p);
629                p->p_rux.rux_runtime = 0;
630                p->p_rux.rux_uticks = 0;
631                p->p_rux.rux_sticks = 0;
632                p->p_rux.rux_iticks = 0;
633                FOREACH_THREAD_IN_PROC(p, td) {
634                        td->td_runtime = 0;
635                }
636        }
637        sx_sunlock(&allproc_lock);
638        PCPU_SET(switchtime, cpu_ticks());
639        PCPU_SET(switchticks, ticks);
640
641        /*
642         * Give the ``random'' number generator a thump.
643         */
644        nanotime(&ts);
645        srandom(ts.tv_sec ^ ts.tv_nsec);
646}
647SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
648
649static void
650random_init(void *dummy __unused)
651{
652
653        /*
654         * After CPU has been started we have some randomness on most
655         * platforms via get_cyclecount().  For platforms that don't
656         * we will reseed random(9) in proc0_post() as well.
657         */
658        srandom(get_cyclecount());
659}
660SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
661
662/*
663 ***************************************************************************
664 ****
665 **** The following SYSINIT's and glue code should be moved to the
666 **** respective files on a per subsystem basis.
667 ****
668 ***************************************************************************
669 */
670
671
672/*
673 ***************************************************************************
674 ****
675 **** The following code probably belongs in another file, like
676 **** kern/init_init.c.
677 ****
678 ***************************************************************************
679 */
680
681/*
682 * List of paths to try when searching for "init".
683 */
684static char init_path[MAXPATHLEN] =
685#ifdef  INIT_PATH
686    __XSTRING(INIT_PATH);
687#else
688    "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall";
689#endif
690SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
691        "Path used to search the init process");
692
693/*
694 * Shutdown timeout of init(8).
695 * Unused within kernel, but used to control init(8), hence do not remove.
696 */
697#ifndef INIT_SHUTDOWN_TIMEOUT
698#define INIT_SHUTDOWN_TIMEOUT 120
699#endif
700static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
701SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
702        CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
703        "Unused within kernel, but used to control init(8)");
704
705/*
706 * Start the initial user process; try exec'ing each pathname in init_path.
707 * The program is invoked with one argument containing the boot flags.
708 */
709static void
710start_init(void *dummy)
711{
712        vm_offset_t addr;
713        struct execve_args args;
714        int options, error;
715        char *var, *path, *next, *s;
716        char *ucp, **uap, *arg0, *arg1;
717        struct thread *td;
718        struct proc *p;
719
720        mtx_lock(&Giant);
721
722        GIANT_REQUIRED;
723
724        td = curthread;
725        p = td->td_proc;
726
727        vfs_mountroot();
728
729        /*
730         * Need just enough stack to hold the faked-up "execve()" arguments.
731         */
732        addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
733        if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
734                        FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
735                panic("init: couldn't allocate argument space");
736        p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
737        p->p_vmspace->vm_ssize = 1;
738
739        if ((var = getenv("init_path")) != NULL) {
740                strlcpy(init_path, var, sizeof(init_path));
741                freeenv(var);
742        }
743       
744        for (path = init_path; *path != '\0'; path = next) {
745                while (*path == ':')
746                        path++;
747                if (*path == '\0')
748                        break;
749                for (next = path; *next != '\0' && *next != ':'; next++)
750                        /* nothing */ ;
751                if (bootverbose)
752                        printf("start_init: trying %.*s\n", (int)(next - path),
753                            path);
754                       
755                /*
756                 * Move out the boot flag argument.
757                 */
758                options = 0;
759                ucp = (char *)p->p_sysent->sv_usrstack;
760                (void)subyte(--ucp, 0);         /* trailing zero */
761                if (boothowto & RB_SINGLE) {
762                        (void)subyte(--ucp, 's');
763                        options = 1;
764                }
765#ifdef notyet
766                if (boothowto & RB_FASTBOOT) {
767                        (void)subyte(--ucp, 'f');
768                        options = 1;
769                }
770#endif
771
772#ifdef BOOTCDROM
773                (void)subyte(--ucp, 'C');
774                options = 1;
775#endif
776
777                if (options == 0)
778                        (void)subyte(--ucp, '-');
779                (void)subyte(--ucp, '-');               /* leading hyphen */
780                arg1 = ucp;
781
782                /*
783                 * Move out the file name (also arg 0).
784                 */
785                (void)subyte(--ucp, 0);
786                for (s = next - 1; s >= path; s--)
787                        (void)subyte(--ucp, *s);
788                arg0 = ucp;
789
790                /*
791                 * Move out the arg pointers.
792                 */
793                uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
794                (void)suword((caddr_t)--uap, (long)0);  /* terminator */
795                (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
796                (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
797
798                /*
799                 * Point at the arguments.
800                 */
801                args.fname = arg0;
802                args.argv = uap;
803                args.envv = NULL;
804
805                /*
806                 * Now try to exec the program.  If can't for any reason
807                 * other than it doesn't exist, complain.
808                 *
809                 * Otherwise, return via fork_trampoline() all the way
810                 * to user mode as init!
811                 */
812                if ((error = sys_execve(td, &args)) == 0) {
813                        mtx_unlock(&Giant);
814                        return;
815                }
816                if (error != ENOENT)
817                        printf("exec %.*s: error %d\n", (int)(next - path), 
818                            path, error);
819        }
820        printf("init: not found in path %s\n", init_path);
821        panic("no init");
822}
823
824/*
825 * Like kproc_create(), but runs in it's own address space.
826 * We do this early to reserve pid 1.
827 *
828 * Note special case - do not make it runnable yet.  Other work
829 * in progress will change this more.
830 */
831static void
832create_init(const void *udata __unused)
833{
834        struct ucred *newcred, *oldcred;
835        int error;
836
837        error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc,
838            NULL, 0);
839        if (error)
840                panic("cannot fork init: %d\n", error);
841        KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
842        /* divorce init's credentials from the kernel's */
843        newcred = crget();
844        PROC_LOCK(initproc);
845        initproc->p_flag |= P_SYSTEM | P_INMEM;
846        oldcred = initproc->p_ucred;
847        crcopy(newcred, oldcred);
848#ifdef MAC
849        mac_cred_create_init(newcred);
850#endif
851#ifdef AUDIT
852        audit_cred_proc1(newcred);
853#endif
854        initproc->p_ucred = newcred;
855        PROC_UNLOCK(initproc);
856        crfree(oldcred);
857        cred_update_thread(FIRST_THREAD_IN_PROC(initproc));
858        cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL);
859}
860SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
861
862/*
863 * Make it runnable now.
864 */
865static void
866kick_init(const void *udata __unused)
867{
868        struct thread *td;
869
870        td = FIRST_THREAD_IN_PROC(initproc);
871        thread_lock(td);
872        TD_SET_CAN_RUN(td);
873        sched_add(td, SRQ_BORING);
874        thread_unlock(td);
875}
876SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);
877#endif /* __rtems__ */
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