Move files to match FreeBSD layout

1 files changed, 835 insertions, 0 deletions

diff --git a/freebsd/sys/kern/init_main.c b/freebsd/sys/kern/init_main.c
new file mode 100644
index 00000000..0225a246
--- /dev/null
+++ b/freebsd/sys/kern/init_main.c
@@ -0,0 +1,835 @@
+#include <freebsd/machine/rtems-bsd-config.h>
+
+/*-
+ * Copyright (c) 1995 Terrence R. Lambert
+ * All rights reserved.
+ *
+ * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)init_main.c	8.9 (Berkeley) 1/21/94
+ */
+
+#include <freebsd/sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <freebsd/local/opt_ddb.h>
+#include <freebsd/local/opt_init_path.h>
+
+#include <freebsd/sys/param.h>
+#include <freebsd/sys/kernel.h>
+#include <freebsd/sys/exec.h>
+#include <freebsd/sys/file.h>
+#include <freebsd/sys/filedesc.h>
+#include <freebsd/sys/jail.h>
+#include <freebsd/sys/ktr.h>
+#include <freebsd/sys/lock.h>
+#include <freebsd/sys/mount.h>
+#include <freebsd/sys/mutex.h>
+#include <freebsd/sys/syscallsubr.h>
+#include <freebsd/sys/sysctl.h>
+#include <freebsd/sys/proc.h>
+#include <freebsd/sys/resourcevar.h>
+#include <freebsd/sys/systm.h>
+#include <freebsd/sys/signalvar.h>
+#include <freebsd/sys/vnode.h>
+#include <freebsd/sys/sysent.h>
+#include <freebsd/sys/reboot.h>
+#include <freebsd/sys/sched.h>
+#include <freebsd/sys/sx.h>
+#include <freebsd/sys/sysproto.h>
+#include <freebsd/sys/vmmeter.h>
+#include <freebsd/sys/unistd.h>
+#include <freebsd/sys/malloc.h>
+#include <freebsd/sys/conf.h>
+#include <freebsd/sys/cpuset.h>
+
+#include <freebsd/machine/cpu.h>
+
+#include <freebsd/security/audit/audit.h>
+#include <freebsd/security/mac/mac_framework.h>
+
+#include <freebsd/vm/vm.h>
+#include <freebsd/vm/vm_param.h>
+#include <freebsd/vm/pmap.h>
+#include <freebsd/vm/vm_map.h>
+#include <freebsd/sys/copyright.h>
+
+#include <freebsd/ddb/ddb.h>
+#include <freebsd/ddb/db_sym.h>
+
+void mi_startup(void);				/* Should be elsewhere */
+
+#ifndef __rtems__
+/* Components of the first process -- never freed. */
+static struct session session0;
+static struct pgrp pgrp0;
+struct	proc proc0;
+struct	thread thread0 __aligned(16);
+struct	vmspace vmspace0;
+struct	proc *initproc;
+
+int	boothowto = 0;		/* initialized so that it can be patched */
+SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, "");
+int	bootverbose;
+SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, "");
+
+/*
+ * This ensures that there is at least one entry so that the sysinit_set
+ * symbol is not undefined.  A sybsystem ID of SI_SUB_DUMMY is never
+ * executed.
+ */
+SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
+
+/*
+ * The sysinit table itself.  Items are checked off as the are run.
+ * If we want to register new sysinit types, add them to newsysinit.
+ */
+#endif /* __rtems__ */
+SET_DECLARE(sysinit_set, struct sysinit);
+#ifndef __rtems__
+struct sysinit **sysinit, **sysinit_end;
+struct sysinit **newsysinit, **newsysinit_end;
+
+/*
+ * Merge a new sysinit set into the current set, reallocating it if
+ * necessary.  This can only be called after malloc is running.
+ */
+void
+sysinit_add(struct sysinit **set, struct sysinit **set_end)
+{
+	struct sysinit **newset;
+	struct sysinit **sipp;
+	struct sysinit **xipp;
+	int count;
+
+	count = set_end - set;
+	if (newsysinit)
+		count += newsysinit_end - newsysinit;
+	else
+		count += sysinit_end - sysinit;
+	newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
+	if (newset == NULL)
+		panic("cannot malloc for sysinit");
+	xipp = newset;
+	if (newsysinit)
+		for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
+			*xipp++ = *sipp;
+	else
+		for (sipp = sysinit; sipp < sysinit_end; sipp++)
+			*xipp++ = *sipp;
+	for (sipp = set; sipp < set_end; sipp++)
+		*xipp++ = *sipp;
+	if (newsysinit)
+		free(newsysinit, M_TEMP);
+	newsysinit = newset;
+	newsysinit_end = newset + count;
+}
+#endif /* __rtems__ */
+
+/*
+ * System startup; initialize the world, create process 0, mount root
+ * filesystem, and fork to create init and pagedaemon.  Most of the
+ * hard work is done in the lower-level initialization routines including
+ * startup(), which does memory initialization and autoconfiguration.
+ *
+ * This allows simple addition of new kernel subsystems that require
+ * boot time initialization.  It also allows substitution of subsystem
+ * (for instance, a scheduler, kernel profiler, or VM system) by object
+ * module.  Finally, it allows for optional "kernel threads".
+ */
+void
+mi_startup(void)
+{
+
+	register struct sysinit **sipp;		/* system initialization*/
+	register struct sysinit **xipp;		/* interior loop of sort*/
+	register struct sysinit *save;		/* bubble*/
+#ifdef __rtems__
+	struct sysinit **sysinit = NULL;
+	struct sysinit **sysinit_end = NULL;
+#endif /* __rtems__ */
+
+#if defined(VERBOSE_SYSINIT)
+	int last;
+	int verbose;
+#endif
+
+#ifndef __rtems__
+	if (boothowto & RB_VERBOSE)
+		bootverbose++;
+#endif /* __rtems__ */
+
+	if (sysinit == NULL) {
+		sysinit = SET_BEGIN(sysinit_set);
+		sysinit_end = SET_LIMIT(sysinit_set);
+	}
+
+restart:
+	/*
+	 * Perform a bubble sort of the system initialization objects by
+	 * their subsystem (primary key) and order (secondary key).
+	 */
+	for (sipp = sysinit; sipp < sysinit_end; sipp++) {
+		for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
+			if ((*sipp)->subsystem < (*xipp)->subsystem ||
+			     ((*sipp)->subsystem == (*xipp)->subsystem &&
+			      (*sipp)->order <= (*xipp)->order))
+				continue;	/* skip*/
+			save = *sipp;
+			*sipp = *xipp;
+			*xipp = save;
+		}
+	}
+
+#if defined(VERBOSE_SYSINIT)
+	last = SI_SUB_COPYRIGHT;
+	verbose = 0;
+#if !defined(DDB)
+	printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
+#endif
+#endif
+
+	/*
+	 * Traverse the (now) ordered list of system initialization tasks.
+	 * Perform each task, and continue on to the next task.
+	 *
+	 * The last item on the list is expected to be the scheduler,
+	 * which will not return.
+	 */
+	for (sipp = sysinit; sipp < sysinit_end; sipp++) {
+
+		if ((*sipp)->subsystem == SI_SUB_DUMMY)
+			continue;	/* skip dummy task(s)*/
+
+		if ((*sipp)->subsystem == SI_SUB_DONE)
+			continue;
+
+#if defined(VERBOSE_SYSINIT)
+		if ((*sipp)->subsystem > last) {
+			verbose = 1;
+			last = (*sipp)->subsystem;
+			printf("subsystem %x\n", last);
+		}
+		if (verbose) {
+#if defined(DDB)
+			const char *name;
+			c_db_sym_t sym;
+			db_expr_t  offset;
+
+			sym = db_search_symbol((vm_offset_t)(*sipp)->func,
+			    DB_STGY_PROC, &offset);
+			db_symbol_values(sym, &name, NULL);
+			if (name != NULL)
+				printf("   %s(%p)... ", name, (*sipp)->udata);
+			else
+#endif
+				printf("   %p(%p)... ", (*sipp)->func,
+				    (*sipp)->udata);
+		}
+#endif
+
+		/* Call function */
+		(*((*sipp)->func))((*sipp)->udata);
+
+#if defined(VERBOSE_SYSINIT)
+		if (verbose)
+			printf("done.\n");
+#endif
+
+		/* Check off the one we're just done */
+		(*sipp)->subsystem = SI_SUB_DONE;
+
+#ifndef __rtems__
+		/* Check if we've installed more sysinit items via KLD */
+		if (newsysinit != NULL) {
+			if (sysinit != SET_BEGIN(sysinit_set))
+				free(sysinit, M_TEMP);
+			sysinit = newsysinit;
+			sysinit_end = newsysinit_end;
+			newsysinit = NULL;
+			newsysinit_end = NULL;
+			goto restart;
+		}
+#endif /* __rtems__ */
+	}
+
+#ifndef __rtems__
+	panic("Shouldn't get here!");
+	/* NOTREACHED*/
+#endif /* __rtems__ */
+}
+
+
+#ifndef __rtems__
+/*
+ ***************************************************************************
+ ****
+ **** The following SYSINIT's belong elsewhere, but have not yet
+ **** been moved.
+ ****
+ ***************************************************************************
+ */
+static void
+print_caddr_t(void *data)
+{
+	printf("%s", (char *)data);
+}
+
+static void
+print_version(void *data __unused)
+{
+	int len;
+
+	/* Strip a trailing newline from version. */
+	len = strlen(version);
+	while (len > 0 && version[len - 1] == '\n')
+		len--;
+	printf("%.*s %s\n", len, version, machine);
+}
+
+SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
+    copyright);
+SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
+    trademark);
+SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
+
+#ifdef WITNESS
+static char wit_warn[] =
+     "WARNING: WITNESS option enabled, expect reduced performance.\n";
+SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
+   print_caddr_t, wit_warn);
+SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1,
+   print_caddr_t, wit_warn);
+#endif
+
+#ifdef DIAGNOSTIC
+static char diag_warn[] =
+     "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
+SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
+    print_caddr_t, diag_warn);
+SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2,
+    print_caddr_t, diag_warn);
+#endif
+
+static int
+null_fetch_syscall_args(struct thread *td __unused,
+    struct syscall_args *sa __unused)
+{
+
+	panic("null_fetch_syscall_args");
+}
+
+static void
+null_set_syscall_retval(struct thread *td __unused, int error __unused)
+{
+
+	panic("null_set_syscall_retval");
+}
+
+struct sysentvec null_sysvec = {
+	.sv_size	= 0,
+	.sv_table	= NULL,
+	.sv_mask	= 0,
+	.sv_sigsize	= 0,
+	.sv_sigtbl	= NULL,
+	.sv_errsize	= 0,
+	.sv_errtbl	= NULL,
+	.sv_transtrap	= NULL,
+	.sv_fixup	= NULL,
+	.sv_sendsig	= NULL,
+	.sv_sigcode	= NULL,
+	.sv_szsigcode	= NULL,
+	.sv_prepsyscall	= NULL,
+	.sv_name	= "null",
+	.sv_coredump	= NULL,
+	.sv_imgact_try	= NULL,
+	.sv_minsigstksz	= 0,
+	.sv_pagesize	= PAGE_SIZE,
+	.sv_minuser	= VM_MIN_ADDRESS,
+	.sv_maxuser	= VM_MAXUSER_ADDRESS,
+	.sv_usrstack	= USRSTACK,
+	.sv_psstrings	= PS_STRINGS,
+	.sv_stackprot	= VM_PROT_ALL,
+	.sv_copyout_strings	= NULL,
+	.sv_setregs	= NULL,
+	.sv_fixlimit	= NULL,
+	.sv_maxssiz	= NULL,
+	.sv_flags	= 0,
+	.sv_set_syscall_retval = null_set_syscall_retval,
+	.sv_fetch_syscall_args = null_fetch_syscall_args,
+	.sv_syscallnames = NULL,
+};
+#endif /* __rtems__ */
+
+/*
+ ***************************************************************************
+ ****
+ **** The two following SYSINIT's are proc0 specific glue code.  I am not
+ **** convinced that they can not be safely combined, but their order of
+ **** operation has been maintained as the same as the original init_main.c
+ **** for right now.
+ ****
+ **** These probably belong in init_proc.c or kern_proc.c, since they
+ **** deal with proc0 (the fork template process).
+ ****
+ ***************************************************************************
+ */
+/* ARGSUSED*/
+static void
+proc0_init(void *dummy __unused)
+{
+#ifndef __rtems__
+	struct proc *p;
+	unsigned i;
+	struct thread *td;
+
+	GIANT_REQUIRED;
+	p = &proc0;
+	td = &thread0;
+	
+	/*
+	 * Initialize magic number and osrel.
+	 */
+	p->p_magic = P_MAGIC;
+	p->p_osrel = osreldate;
+#endif /* __rtems__ */
+
+	/*
+	 * Initialize thread and process structures.
+	 */
+	procinit();	/* set up proc zone */
+#ifndef __rtems__
+	threadinit();	/* set up UMA zones */
+
+	/*
+	 * Initialise scheduler resources.
+	 * Add scheduler specific parts to proc, thread as needed.
+	 */
+	schedinit();	/* scheduler gets its house in order */
+	/*
+	 * Initialize sleep queue hash table
+	 */
+	sleepinit();
+
+	/*
+	 * additional VM structures
+	 */
+	vm_init2();
+
+	/*
+	 * Create process 0 (the swapper).
+	 */
+	LIST_INSERT_HEAD(&allproc, p, p_list);
+	LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
+	mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
+	p->p_pgrp = &pgrp0;
+	LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
+	LIST_INIT(&pgrp0.pg_members);
+	LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
+
+	pgrp0.pg_session = &session0;
+	mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
+	refcount_init(&session0.s_count, 1);
+	session0.s_leader = p;
+
+	p->p_sysent = &null_sysvec;
+	p->p_flag = P_SYSTEM | P_INMEM;
+	p->p_state = PRS_NORMAL;
+	knlist_init_mtx(&p->p_klist, &p->p_mtx);
+	STAILQ_INIT(&p->p_ktr);
+	p->p_nice = NZERO;
+	td->td_tid = PID_MAX + 1;
+	td->td_state = TDS_RUNNING;
+	td->td_pri_class = PRI_TIMESHARE;
+	td->td_user_pri = PUSER;
+	td->td_base_user_pri = PUSER;
+	td->td_priority = PVM;
+	td->td_base_pri = PUSER;
+	td->td_oncpu = 0;
+	td->td_flags = TDF_INMEM|TDP_KTHREAD;
+	td->td_cpuset = cpuset_thread0();
+	prison0.pr_cpuset = cpuset_ref(td->td_cpuset);
+	p->p_peers = 0;
+	p->p_leader = p;
+
+
+	strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
+	strncpy(td->td_name, "swapper", sizeof (td->td_name));
+
+	callout_init(&p->p_itcallout, CALLOUT_MPSAFE);
+	callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
+	callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
+
+	/* Create credentials. */
+	p->p_ucred = crget();
+	p->p_ucred->cr_ngroups = 1;	/* group 0 */
+	p->p_ucred->cr_uidinfo = uifind(0);
+	p->p_ucred->cr_ruidinfo = uifind(0);
+	p->p_ucred->cr_prison = &prison0;
+#ifdef AUDIT
+	audit_cred_kproc0(p->p_ucred);
+#endif
+#ifdef MAC
+	mac_cred_create_swapper(p->p_ucred);
+#endif
+	td->td_ucred = crhold(p->p_ucred);
+
+	/* Create sigacts. */
+	p->p_sigacts = sigacts_alloc();
+
+	/* Initialize signal state for process 0. */
+	siginit(&proc0);
+
+	/* Create the file descriptor table. */
+	p->p_fd = fdinit(NULL);
+	p->p_fdtol = NULL;
+
+	/* Create the limits structures. */
+	p->p_limit = lim_alloc();
+	for (i = 0; i < RLIM_NLIMITS; i++)
+		p->p_limit->pl_rlimit[i].rlim_cur =
+		    p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
+	p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
+	    p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
+	p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
+	    p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
+	i = ptoa(cnt.v_free_count);
+	p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = i;
+	p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i;
+	p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3;
+	p->p_cpulimit = RLIM_INFINITY;
+
+	p->p_stats = pstats_alloc();
+
+	/* Allocate a prototype map so we have something to fork. */
+	pmap_pinit0(vmspace_pmap(&vmspace0));
+	p->p_vmspace = &vmspace0;
+	vmspace0.vm_refcnt = 1;
+
+	/*
+	 * proc0 is not expected to enter usermode, so there is no special
+	 * handling for sv_minuser here, like is done for exec_new_vmspace().
+	 */
+	vm_map_init(&vmspace0.vm_map, p->p_sysent->sv_minuser,
+	    p->p_sysent->sv_maxuser);
+	vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0);
+
+	/*-
+	 * call the init and ctor for the new thread and proc
+	 * we wait to do this until all other structures
+	 * are fairly sane.
+	 */
+	EVENTHANDLER_INVOKE(process_init, p);
+	EVENTHANDLER_INVOKE(thread_init, td);
+	EVENTHANDLER_INVOKE(process_ctor, p);
+	EVENTHANDLER_INVOKE(thread_ctor, td);
+
+	/*
+	 * Charge root for one process.
+	 */
+	(void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
+#endif /* __rtems__ */
+}
+SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
+
+#ifndef __rtems__
+/* ARGSUSED*/
+static void
+proc0_post(void *dummy __unused)
+{
+	struct timespec ts;
+	struct proc *p;
+	struct rusage ru;
+	struct thread *td;
+
+	/*
+	 * Now we can look at the time, having had a chance to verify the
+	 * time from the filesystem.  Pretend that proc0 started now.
+	 */
+	sx_slock(&allproc_lock);
+	FOREACH_PROC_IN_SYSTEM(p) {
+		microuptime(&p->p_stats->p_start);
+		PROC_SLOCK(p);
+		rufetch(p, &ru);	/* Clears thread stats */
+		PROC_SUNLOCK(p);
+		p->p_rux.rux_runtime = 0;
+		p->p_rux.rux_uticks = 0;
+		p->p_rux.rux_sticks = 0;
+		p->p_rux.rux_iticks = 0;
+		FOREACH_THREAD_IN_PROC(p, td) {
+			td->td_runtime = 0;
+		}
+	}
+	sx_sunlock(&allproc_lock);
+	PCPU_SET(switchtime, cpu_ticks());
+	PCPU_SET(switchticks, ticks);
+
+	/*
+	 * Give the ``random'' number generator a thump.
+	 */
+	nanotime(&ts);
+	srandom(ts.tv_sec ^ ts.tv_nsec);
+}
+SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
+
+static void
+random_init(void *dummy __unused)
+{
+
+	/*
+	 * After CPU has been started we have some randomness on most
+	 * platforms via get_cyclecount().  For platforms that don't
+	 * we will reseed random(9) in proc0_post() as well.
+	 */
+	srandom(get_cyclecount());
+}
+SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
+
+/*
+ ***************************************************************************
+ ****
+ **** The following SYSINIT's and glue code should be moved to the
+ **** respective files on a per subsystem basis.
+ ****
+ ***************************************************************************
+ */
+
+
+/*
+ ***************************************************************************
+ ****
+ **** The following code probably belongs in another file, like
+ **** kern/init_init.c.
+ ****
+ ***************************************************************************
+ */
+
+/*
+ * List of paths to try when searching for "init".
+ */
+static char init_path[MAXPATHLEN] =
+#ifdef	INIT_PATH
+    __XSTRING(INIT_PATH);
+#else
+    "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall";
+#endif
+SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
+	"Path used to search the init process");
+
+/*
+ * Shutdown timeout of init(8).
+ * Unused within kernel, but used to control init(8), hence do not remove.
+ */
+#ifndef INIT_SHUTDOWN_TIMEOUT
+#define INIT_SHUTDOWN_TIMEOUT 120
+#endif
+static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
+SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
+	CTLFLAG_RW, &init_shutdown_timeout, 0, "");
+
+/*
+ * Start the initial user process; try exec'ing each pathname in init_path.
+ * The program is invoked with one argument containing the boot flags.
+ */
+static void
+start_init(void *dummy)
+{
+	vm_offset_t addr;
+	struct execve_args args;
+	int options, error;
+	char *var, *path, *next, *s;
+	char *ucp, **uap, *arg0, *arg1;
+	struct thread *td;
+	struct proc *p;
+
+	mtx_lock(&Giant);
+
+	GIANT_REQUIRED;
+
+	td = curthread;
+	p = td->td_proc;
+
+	vfs_mountroot();
+
+	/*
+	 * Need just enough stack to hold the faked-up "execve()" arguments.
+	 */
+	addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
+	if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
+			FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
+		panic("init: couldn't allocate argument space");
+	p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
+	p->p_vmspace->vm_ssize = 1;
+
+	if ((var = getenv("init_path")) != NULL) {
+		strlcpy(init_path, var, sizeof(init_path));
+		freeenv(var);
+	}
+	
+	for (path = init_path; *path != '\0'; path = next) {
+		while (*path == ':')
+			path++;
+		if (*path == '\0')
+			break;
+		for (next = path; *next != '\0' && *next != ':'; next++)
+			/* nothing */ ;
+		if (bootverbose)
+			printf("start_init: trying %.*s\n", (int)(next - path),
+			    path);
+			
+		/*
+		 * Move out the boot flag argument.
+		 */
+		options = 0;
+		ucp = (char *)p->p_sysent->sv_usrstack;
+		(void)subyte(--ucp, 0);		/* trailing zero */
+		if (boothowto & RB_SINGLE) {
+			(void)subyte(--ucp, 's');
+			options = 1;
+		}
+#ifdef notyet
+                if (boothowto & RB_FASTBOOT) {
+			(void)subyte(--ucp, 'f');
+			options = 1;
+		}
+#endif
+
+#ifdef BOOTCDROM
+		(void)subyte(--ucp, 'C');
+		options = 1;
+#endif
+
+		if (options == 0)
+			(void)subyte(--ucp, '-');
+		(void)subyte(--ucp, '-');		/* leading hyphen */
+		arg1 = ucp;
+
+		/*
+		 * Move out the file name (also arg 0).
+		 */
+		(void)subyte(--ucp, 0);
+		for (s = next - 1; s >= path; s--)
+			(void)subyte(--ucp, *s);
+		arg0 = ucp;
+
+		/*
+		 * Move out the arg pointers.
+		 */
+		uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
+		(void)suword((caddr_t)--uap, (long)0);	/* terminator */
+		(void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
+		(void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
+
+		/*
+		 * Point at the arguments.
+		 */
+		args.fname = arg0;
+		args.argv = uap;
+		args.envv = NULL;
+
+		/*
+		 * Now try to exec the program.  If can't for any reason
+		 * other than it doesn't exist, complain.
+		 *
+		 * Otherwise, return via fork_trampoline() all the way
+		 * to user mode as init!
+		 */
+		if ((error = execve(td, &args)) == 0) {
+			mtx_unlock(&Giant);
+			return;
+		}
+		if (error != ENOENT)
+			printf("exec %.*s: error %d\n", (int)(next - path), 
+			    path, error);
+	}
+	printf("init: not found in path %s\n", init_path);
+	panic("no init");
+}
+
+/*
+ * Like kproc_create(), but runs in it's own address space.
+ * We do this early to reserve pid 1.
+ *
+ * Note special case - do not make it runnable yet.  Other work
+ * in progress will change this more.
+ */
+static void
+create_init(const void *udata __unused)
+{
+	struct ucred *newcred, *oldcred;
+	int error;
+
+	error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc);
+	if (error)
+		panic("cannot fork init: %d\n", error);
+	KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
+	/* divorce init's credentials from the kernel's */
+	newcred = crget();
+	PROC_LOCK(initproc);
+	initproc->p_flag |= P_SYSTEM | P_INMEM;
+	oldcred = initproc->p_ucred;
+	crcopy(newcred, oldcred);
+#ifdef MAC
+	mac_cred_create_init(newcred);
+#endif
+#ifdef AUDIT
+	audit_cred_proc1(newcred);
+#endif
+	initproc->p_ucred = newcred;
+	PROC_UNLOCK(initproc);
+	crfree(oldcred);
+	cred_update_thread(FIRST_THREAD_IN_PROC(initproc));
+	cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL);
+}
+SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
+
+/*
+ * Make it runnable now.
+ */
+static void
+kick_init(const void *udata __unused)
+{
+	struct thread *td;
+
+	td = FIRST_THREAD_IN_PROC(initproc);
+	thread_lock(td);
+	TD_SET_CAN_RUN(td);
+	sched_add(td, SRQ_BORING);
+	thread_unlock(td);
+}
+SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);
+#endif /* __rtems__ */