 @@ -1,1176 +1,1178 @@
-/*	$NetBSD: init_main.c,v 1.518 2020/01/08 17:38:42 ad Exp $	*/
+/*	$NetBSD: init_main.c,v 1.519 2020/01/28 16:35:39 ad Exp $	*/
 /*-
  * Copyright (c) 2008, 2009, 2019 The NetBSD Foundation, Inc.
  * All rights reserved.
+ *
  * 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.
+ *
  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
  */
 /*
  * 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. 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	8.16 (Berkeley) 5/14/95
  */
 /*
  * Copyright (c) 1995 Christopher G. Demetriou.  All rights reserved.
+ *
  * 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	8.16 (Berkeley) 5/14/95
  */
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.518 2020/01/08 17:38:42 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.519 2020/01/28 16:35:39 ad Exp $");
 #include "opt_ddb.h"
 #include "opt_inet.h"
 #include "opt_ipsec.h"
 #include "opt_modular.h"
 #include "opt_ntp.h"
 #include "opt_pipe.h"
 #include "opt_syscall_debug.h"
 #include "opt_sysv.h"
 #include "opt_fileassoc.h"
 #include "opt_ktrace.h"
 #include "opt_pax.h"
 #include "opt_compat_netbsd.h"
 #include "opt_wapbl.h"
 #include "opt_ptrace.h"
 #include "opt_rnd_printf.h"
 #include "opt_splash.h"
 #include "opt_kernhist.h"
 #include "opt_gprof.h"
 #if defined(SPLASHSCREEN) && defined(makeoptions_SPLASHSCREEN_IMAGE)
 extern void *_binary_splash_image_start;
 extern void *_binary_splash_image_end;
 #endif
 #include "ksyms.h"
 #include "veriexec.h"
 #include <sys/param.h>
 #include <sys/acct.h>
 #include <sys/filedesc.h>
 #include <sys/file.h>
 #include <sys/errno.h>
 #include <sys/callout.h>
 #include <sys/cpu.h>
 #include <sys/cpufreq.h>
 #include <sys/spldebug.h>
 #include <sys/kernel.h>
 #include <sys/mount.h>
 #include <sys/proc.h>
 #include <sys/kthread.h>
 #include <sys/resourcevar.h>
 #include <sys/signalvar.h>
 #include <sys/systm.h>
 #include <sys/vnode.h>
 #include <sys/fstrans.h>
 #include <sys/tty.h>
 #include <sys/conf.h>
 #include <sys/disklabel.h>
 #include <sys/buf.h>
 #include <sys/device.h>
 #include <sys/exec.h>
 #include <sys/socketvar.h>
 #include <sys/protosw.h>
 #include <sys/percpu.h>
 #include <sys/pserialize.h>
 #include <sys/pset.h>
 #include <sys/sysctl.h>
 #include <sys/reboot.h>
 #include <sys/event.h>
 #include <sys/mbuf.h>
 #include <sys/sched.h>
 #include <sys/sleepq.h>
 #include <sys/ipi.h>
 #include <sys/iostat.h>
 #include <sys/vmem.h>
 #include <sys/uuid.h>
 #include <sys/extent.h>
 #include <sys/disk.h>
 #include <sys/msgbuf.h>
 #include <sys/module.h>
 #include <sys/module_hook.h>
 #include <sys/event.h>
 #include <sys/lockf.h>
 #include <sys/once.h>
 #include <sys/kcpuset.h>
 #include <sys/ksyms.h>
 #include <sys/uidinfo.h>
 #include <sys/kprintf.h>
 #include <sys/bufq.h>
 #include <sys/threadpool.h>
 #ifdef IPSEC
 #include <netipsec/ipsec.h>
 #endif
 #include <sys/domain.h>
 #include <sys/namei.h>
 #include <sys/rnd.h>
 #include <sys/pipe.h>
 #if NVERIEXEC > 0
 #include <sys/verified_exec.h>
 #endif /* NVERIEXEC > 0 */
 #ifdef KTRACE
 #include <sys/ktrace.h>
 #endif
 #include <sys/kauth.h>
 #include <net80211/ieee80211_netbsd.h>
 #include <sys/cprng.h>
 #include <sys/psref.h>
 #include <sys/radixtree.h>
 #include <sys/syscall.h>
 #include <sys/syscallargs.h>
 #include <sys/pax.h>
 #include <dev/clock_subr.h>
 #include <secmodel/secmodel.h>
 #include <ufs/ufs/quota.h>
 #include <miscfs/genfs/genfs.h>
 #include <miscfs/specfs/specdev.h>
 #include <sys/cpu.h>
 #include <uvm/uvm.h>	/* extern struct uvm uvm */
 #include <dev/cons.h>
 #include <dev/splash/splash.h>
 #include <net/bpf.h>
 #include <net/if.h>
 #include <net/pfil.h>
 #include <net/raw_cb.h>
 #include <net/if_llatbl.h>
 #include <prop/proplib.h>
 #include <sys/userconf.h>
 extern struct lwp lwp0;
 extern time_t rootfstime;
 #ifndef curlwp
 struct	lwp *curlwp = &lwp0;
 #endif
 struct	proc *initproc;
 struct	vnode *rootvp, *swapdev_vp;
 int	boothowto;
 int	cold __read_mostly = 1;		/* still working on startup */
 int	shutting_down __read_mostly;	/* system is shutting down */
 int	start_init_exec;		/* semaphore for start_init() */
 cprng_strong_t	*kern_cprng;
 static void check_console(struct lwp *l);
 static void start_init(void *);
 static void configure(void);
 static void configure2(void);
 static void configure3(void);
 void main(void);
 /*
  * 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.
  */
 void
 main(void)
+{
 	struct timespec time;
 	struct lwp *l;
 	struct proc *p;
 	int s, error;
 #ifdef NVNODE_IMPLICIT
 	int usevnodes;
 #endif
 	CPU_INFO_ITERATOR cii;
 	struct cpu_info *ci;
 #ifdef DIAGNOSTIC
 	/*
 	 * Verify that CPU_INFO_FOREACH() knows about the boot CPU
 	 * and only the boot CPU at this point.
 	 */
 	int cpucount = 0;
 	for (CPU_INFO_FOREACH(cii, ci)) {
 		KASSERT(ci == curcpu());
 		cpucount++;
+	}
 	KASSERT(cpucount == 1);
 #endif
 	l = &lwp0;
 #ifndef LWP0_CPU_INFO
 	l->l_cpu = curcpu();
 #endif
 	l->l_flag |= LW_RUNNING;
 	/*
 	 * Attempt to find console and initialize
 	 * in case of early panic or other messages.
 	 */
 	consinit();
 	kernel_lock_init();
 	once_init();
 	todr_init();
 	mi_cpu_init();
 	kernconfig_lock_init();
 	kthread_sysinit();
 	/* Initialize the device switch tables. */
 	devsw_init();
 	/* Initialize event counters. */
 	evcnt_init();
 	uvm_init();
 	ubchist_init();
 	kcpuset_sysinit();
 	prop_kern_init();
 #if ((NKSYMS > 0) || (NDDB > 0) || (NMODULAR > 0))
 	ksyms_init();
 #endif
 	kprintf_init();
 	percpu_init();
 	/* Initialize lock caches. */
 	mutex_obj_init();
 	rw_obj_init();
 	/* Initialize radix trees (used by numerous subsystems). */
 	radix_tree_init();
 	/* Passive serialization. */
 	pserialize_init();
 	/* Initialize the extent manager. */
 	extent_init();
 	/* Do machine-dependent initialization. */
 	cpu_startup();
 	/* Initialize the sysctl subsystem. */
 	sysctl_init();
 	/* Initialize callouts, part 1. */
 	callout_startup();
 	/* Initialize the kernel authorization subsystem. */
 	kauth_init();
 	secmodel_init();
 	spec_init();
 	/*
 	 * Set BPF op vector.  Can't do this in bpf attach, since
 	 * network drivers attach before bpf.
 	 */
 	bpf_setops();
 	/* Start module system. */
 	module_init();
 	module_hook_init();
 	/*
 	 * Initialize the kernel authorization subsystem and start the
 	 * default security model, if any. We need to do this early
 	 * enough so that subsystems relying on any of the aforementioned
 	 * can work properly. Since the security model may dictate the
 	 * credential inheritance policy, it is needed at least before
 	 * any process is created, specifically proc0.
 	 */
 	module_init_class(MODULE_CLASS_SECMODEL);
 	/* Initialize the buffer cache */
 	bufinit();
 	biohist_init();
 #ifdef KERNHIST
 	sysctl_kernhist_init();
 #endif
 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_IMAGE)
 	size_t splash_size = (&_binary_splash_image_end -
 	    &_binary_splash_image_start) * sizeof(void *);
 	splash_setimage(&_binary_splash_image_start, splash_size);
 #endif
 	/* Initialize sockets. */
 	soinit();
 	/*
 	 * The following things must be done before autoconfiguration.
 	 */
 	rnd_init();		/* initialize entropy pool */
 	cprng_init();		/* initialize cryptographic PRNG */
 	/* Initialize process and pgrp structures. */
 	procinit();
 	lwpinit();
 	/* Must be called after lwpinit (lwpinit_specificdata) */
 	psref_init();
 	/* Initialize signal-related data structures. */
 	signal_init();
 	/* Initialize resource management. */
 	resource_init();
 	/* Create process 0. */
 	proc0_init();
 	lwp0_init();
 	/* Disable preemption during boot. */
 	kpreempt_disable();
 	/* Initialize the threadpool system. */
 	threadpools_init();
 	/* Initialize the UID hash table. */
 	uid_init();
 	/* Charge root for one process. */
 	(void)chgproccnt(0, 1);
 	/* Initialize timekeeping. */
 	time_init();
 	/* Initialize the run queues, turnstiles and sleep queues. */
 	sched_rqinit();
 	turnstile_init();
 	sleeptab_init(&sleeptab);
 	sched_init();
 	/* Initialize processor-sets */
 	psets_init();
 	/* Initialize cpufreq(9) */
 	cpufreq_init();
 	/* MI initialization of the boot cpu */
 	error = mi_cpu_attach(curcpu());
 	KASSERT(error == 0);
 	/* Initialize timekeeping, part 2. */
 	time_init2();
 	/*
 	 * Initialize mbuf's.  Do this now because we might attempt to
 	 * allocate mbufs or mbuf clusters during autoconfiguration.
 	 */
 	mbinit();
 	/* Initialize I/O statistics. */
 	iostat_init();
 	/* Initialize the log device. */
 	loginit();
 	/* Second part of module system initialization. */
 	module_start_unload_thread();
 	/* Initialize the file systems. */
 #ifdef NVNODE_IMPLICIT
 	/*
 	 * If maximum number of vnodes in namei vnode cache is not explicitly
 	 * defined in kernel config, adjust the number such as we use roughly
 	 * 10% of memory for vnodes and associated data structures in the
 	 * assumed worst case.  Do not provide fewer than NVNODE vnodes.
 	 */
 	usevnodes = calc_cache_size(vmem_size(kmem_arena, VMEM_FREE|VMEM_ALLOC),
 , VNODE_KMEM_MAXPCT) / VNODE_COST;
 	if (usevnodes > desiredvnodes)
 		desiredvnodes = usevnodes;
 #endif
 	/* Initialize fstrans. */
 	fstrans_init();
 	radix_tree_init(); /* used for page cache */
 	vfsinit();
 	lf_init();
 	/* Initialize the file descriptor system. */
 	fd_sys_init();
 	/* Initialize cwd structures */
 	cwd_sys_init();
 	/* Initialize kqueue. */
 	kqueue_init();
 	inittimecounter();
 	ntp_init();
 	/* Initialize tty subsystem. */
 	tty_init();
 	ttyldisc_init();
 	/* Initialize the buffer cache, part 2. */
 	bufinit2();
 	/* Initialize the disk wedge subsystem. */
 	dkwedge_init();
 	/* Initialize the kernel strong PRNG. */
 	kern_cprng = cprng_strong_create("kernel", IPL_VM,
 					 CPRNG_INIT_ANY|CPRNG_REKEY_ANY);
 	/* Initialize pfil */
 	pfil_init();
 	/* Initialize interfaces. */
 	ifinit1();
 	spldebug_start();
 	/* Initialize sockets thread(s) */
 	soinit1();
 	/*
 	 * Initialize the bufq strategy sub-system and any built-in
 	 * strategy modules - they may be needed by some devices during
 	 * auto-configuration
 	 */
 	bufq_init();
 	module_init_class(MODULE_CLASS_BUFQ);
 	/* Configure the system hardware.  This will enable interrupts. */
 	configure();
 	/* Once all CPUs are detected, initialize the per-CPU cprng_fast.  */
 	cprng_fast_init();
 	ssp_init();
 	ubc_init();		/* must be after autoconfig */
 	mm_init();
 	configure2();
 	ipi_sysinit();
 	/* Now timer is working.  Enable preemption. */
 	kpreempt_enable();
 	/* Get the threads going and into any sleeps before continuing. */
 	yield();
 	/* Enable deferred processing of RNG samples */
 	rnd_init_softint();
 #ifdef RND_PRINTF
 	/* Enable periodic injection of console output into entropy pool */
 	kprintf_init_callout();
 #endif
 	vmem_rehash_start();	/* must be before exec_init */
 	/* Initialize exec structures */
 	exec_init(1);		/* seminit calls exithook_establish() */
 #if NVERIEXEC > 0
 	/*
 	 * Initialise the Veriexec subsystem.
 	 */
 	veriexec_init();
 #endif /* NVERIEXEC > 0 */
 	pax_init();
 #ifdef	IPSEC
 	/* Attach network crypto subsystem */
 	ipsec_attach();
 #endif
 	/*
 	 * Initialize protocols.  Block reception of incoming packets
 	 * until everything is ready.
 	 */
 	s = splnet();
 	ifinit();
 #if defined(INET) || defined(INET6)
 	lltableinit();
 #endif
 	domaininit(true);
 	ifinit_post();
 	if_attachdomain();
 	splx(s);
 #ifdef GPROF
 	/* Initialize kernel profiling. */
 	kmstartup();
 #endif
 	/* Initialize system accounting. */
 	acct_init();
 #ifndef PIPE_SOCKETPAIR
 	/* Initialize pipes. */
 	pipe_init();
 #endif
 #ifdef KTRACE
 	/* Initialize ktrace. */
 	ktrinit();
 #endif
 	machdep_init();
 	procinit_sysctl();
 	scdebug_init();
 	/*
 	 * Create process 1 (init(8)).  We do this now, as Unix has
 	 * historically had init be process 1, and changing this would
 	 * probably upset a lot of people.
+	 *
 	 * Note that process 1 won't immediately exec init(8), but will
 	 * wait for us to inform it that the root file system has been
 	 * mounted.
 	 */
 	if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL))
 		panic("fork init");
 	/*
 	 * The initproc variable cannot be initialized in start_init as there
 	 * is a race between vfs_mountroot and start_init.
 	 */
 	mutex_enter(proc_lock);
 	initproc = proc_find_raw(1);
 	mutex_exit(proc_lock);
 	/*
 	 * Load any remaining builtin modules, and hand back temporary
 	 * storage to the VM system.  Then require force when loading any
 	 * remaining un-init'ed built-in modules to avoid later surprises.
 	 */
 	module_init_class(MODULE_CLASS_ANY);
 	module_builtin_require_force();
 	/*
 	 * Finalize configuration now that all real devices have been
 	 * found.  This needs to be done before the root device is
 	 * selected, since finalization may create the root device.
 	 */
 	config_finalize();
 	sysctl_finalize();
 	/*
 	 * Now that autoconfiguration has completed, we can determine
 	 * the root and dump devices.
 	 */
 	cpu_rootconf();
 	cpu_dumpconf();
 	/* Mount the root file system. */
 	do {
 		domountroothook(root_device);
 		if ((error = vfs_mountroot())) {
 			printf("cannot mount root, error = %d\n", error);
 			boothowto |= RB_ASKNAME;
 			setroot(root_device,
 			    (rootdev != NODEV) ? DISKPART(rootdev) : 0);
+		}
 	} while (error != 0);
 	mountroothook_destroy();
 	configure3();
 	/*
 	 * Initialise the time-of-day clock, passing the time recorded
 	 * in the root filesystem (if any) for use by systems that
 	 * don't have a non-volatile time-of-day device.
 	 */
 	inittodr(rootfstime);
 	/*
 	 * Now can look at time, having had a chance to verify the time
 	 * from the file system.  Reset l->l_rtime as it may have been
 	 * munched in mi_switch() after the time got set.
 	 */
 	getnanotime(&time);
 	mutex_enter(proc_lock);
 	LIST_FOREACH(p, &allproc, p_list) {
 		KASSERT((p->p_flag & PK_MARKER) == 0);
 		mutex_enter(p->p_lock);
 		TIMESPEC_TO_TIMEVAL(&p->p_stats->p_start, &time);
 		LIST_FOREACH(l, &p->p_lwps, l_sibling) {
 			lwp_lock(l);
 			memset(&l->l_rtime, 0, sizeof(l->l_rtime));
 			lwp_unlock(l);
+		}
 		mutex_exit(p->p_lock);
+	}
 	mutex_exit(proc_lock);
 	binuptime(&curlwp->l_stime);
 	for (CPU_INFO_FOREACH(cii, ci)) {
 		ci->ci_schedstate.spc_lastmod = time_second;
+	}
 	/* Create the pageout daemon kernel thread. */
 	uvm_swap_init();
 	if (kthread_create(PRI_PGDAEMON, KTHREAD_MPSAFE, NULL, uvm_pageout,
 	    NULL, NULL, "pgdaemon"))
 		panic("fork pagedaemon");
 	/* Create the filesystem syncer kernel thread. */
 	if (kthread_create(PRI_IOFLUSH, KTHREAD_MPSAFE, NULL, sched_sync,
 	    NULL, NULL, "ioflush"))
 		panic("fork syncer");
 	/* Create the aiodone daemon kernel thread. */
 	if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
 	    uvm_aiodone_worker, NULL, PRI_VM, IPL_NONE, WQ_MPSAFE))
 		panic("fork aiodoned");
 	/* Wait for final configure threads to complete. */
 	config_finalize_mountroot();
 	/*
 	 * Okay, now we can let init(8) exec!  It's off to userland!
 	 */
 	mutex_enter(proc_lock);
 	start_init_exec = 1;
 	cv_broadcast(&lbolt);
 	mutex_exit(proc_lock);
 	/* The scheduler is an infinite loop. */
 	uvm_scheduler();
 	/* NOTREACHED */
+}
 /*
  * Configure the system's hardware.
  */
 static void
 configure(void)
+{
 	/* Initialize autoconf data structures. */
 	config_init_mi();
 	/*
 	 * XXX
 	 * callout_setfunc() requires mutex(9) so it can't be in config_init()
 	 * on amiga and atari which use config_init() and autoconf(9) fucntions
 	 * to initialize console devices.
 	 */
 	config_twiddle_init();
 	pmf_init();
 	/* Initialize driver modules */
 	module_init_class(MODULE_CLASS_DRIVER);
 	userconf_init();
 	if (boothowto & RB_USERCONF)
 		userconf_prompt();
 	if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) {
 		printf_nolog("Detecting hardware...");
+	}
 	/*
 	 * Do the machine-dependent portion of autoconfiguration.  This
 	 * sets the configuration machinery here in motion by "finding"
 	 * the root bus.  When this function returns, we expect interrupts
 	 * to be enabled.
 	 */
 	cpu_configure();
+}
 static void
 configure2(void)
+{
 	CPU_INFO_ITERATOR cii;
 	struct cpu_info *ci;
 	int s;
 	/* Fix up CPU topology info, which has all been collected by now. */
 	cpu_topology_init();
 	/*
 	 * Now that we've found all the hardware, start the real time
 	 * and statistics clocks.
 	 */
 	initclocks();
 	cold = 0;	/* clocks are running, we're warm now! */
 	s = splsched();
 	curcpu()->ci_schedstate.spc_flags |= SPCF_RUNNING;
 	splx(s);
 	/* Setup the runqueues and scheduler. */
 	runq_init();
 	synch_init();
 	/* Boot the secondary processors. */
 	for (CPU_INFO_FOREACH(cii, ci)) {
 		uvm_cpu_attach(ci);
+	}
 	/* Decide how to partition free memory. */
 	uvm_page_rebucket();
 	mp_online = true;
 #if defined(MULTIPROCESSOR)
 	cpu_boot_secondary_processors();
 #endif
 	/*
 	 * Bus scans can make it appear as if the system has paused, so
 	 * twiddle constantly while config_interrupts() jobs are running.
 	 */
 	config_twiddle_fn(NULL);
 	/*
 	 * Create threads to call back and finish configuration for
 	 * devices that want interrupts enabled.
 	 */
 	config_create_interruptthreads();
+}
 static void
 configure3(void)
+{
 	/*
 	 * Create threads to call back and finish configuration for
 	 * devices that want the mounted root file system.
 	 */
 	config_create_mountrootthreads();
 	/* Get the threads going and into any sleeps before continuing. */
 	yield();
+}
 static void
 rootconf_handle_wedges(void)
+{
 	struct disklabel label;
 	struct partition *p;
 	struct vnode *vp;
 	daddr_t startblk;
 	uint64_t nblks;
 	device_t dev;
 	int error;
 	if (booted_nblks) {
 		/*
 		 * bootloader passed geometry
 		 */
 		dev      = booted_device;
 		startblk = booted_startblk;
 		nblks    = booted_nblks;
 		/*
 		 * keep booted_device and booted_partition
 		 * in case the kernel doesn't identify a wedge
 		 */
 	} else {
 		/*
 		 * bootloader passed partition number
+		 *
 		 * We cannot ask the partition device directly when it is
 		 * covered by a wedge. Instead we look up the geometry in
 		 * the disklabel.
 		 */
 		vp = opendisk(booted_device);
 		if (vp == NULL)
 			return;
 		error = VOP_IOCTL(vp, DIOCGDINFO, &label, FREAD, NOCRED);
 		VOP_CLOSE(vp, FREAD, NOCRED);
 		vput(vp);
 		if (error)
 			return;
 		KASSERT(booted_partition >= 0
 			&& booted_partition < MAXPARTITIONS);
 		p = &label.d_partitions[booted_partition];
 		dev      = booted_device;
 		startblk = p->p_offset;
 		nblks    = p->p_size;
+	}
 	dev = dkwedge_find_partition(dev, startblk, nblks);
 	if (dev != NULL) {
 		booted_device = dev;
 		booted_partition = 0;
+	}
+}
 void
 rootconf(void)
+{
 	if (booted_device != NULL)
 		rootconf_handle_wedges();
 	setroot(booted_device, booted_partition);
+}
 static void
 check_console(struct lwp *l)
+{
 	struct vnode *vp;
 	int error;
 	error = namei_simple_kernel("/dev/console",
 				NSM_FOLLOW_NOEMULROOT, &vp);
 	if (error == 0) {
 		vrele(vp);
 	} else if (error == ENOENT) {
 		if (boothowto & (AB_VERBOSE|AB_DEBUG))
 			printf("warning: no /dev/console\n");
 	} else {
 		printf("warning: lookup /dev/console: error %d\n", error);
+	}
+}
 /*
  * List of paths to try when searching for "init".
  */
 static const char * const initpaths[] = {
 	"/sbin/init",
 	"/sbin/oinit",
 	"/sbin/init.bak",
 	"/rescue/init",
 	NULL,
 };
 /*
  * Start the initial user process; try exec'ing each pathname in "initpaths".
  * The program is invoked with one argument containing the boot flags.
  */
 static void
 start_init(void *arg)
+{
 	struct lwp *l = arg;
 	struct proc *p = l->l_proc;
 	vaddr_t addr;
 	struct sys_execve_args /* {
 		syscallarg(const char *) path;
 		syscallarg(char * const *) argp;
 		syscallarg(char * const *) envp;
 	} */ args;
 	int options, i, error;
 	register_t retval[2];
 	char flags[4], *flagsp;
 	const char *path, *slash;
 	char *ucp, **uap, *arg0, *arg1, *argv[3];
 	char ipath[129];
 	int ipx, len;
 	/*
 	 * Now in process 1.
 	 */
 	strncpy(p->p_comm, "init", MAXCOMLEN);
 	/*
 	 * Wait for main() to tell us that it's safe to exec.
 	 */
 	mutex_enter(proc_lock);
 	while (start_init_exec == 0)
 		cv_wait(&lbolt, proc_lock);
 	mutex_exit(proc_lock);
 	/*
 	 * This is not the right way to do this.  We really should
 	 * hand-craft a descriptor onto /dev/console to hand to init,
 	 * but that's a _lot_ more work, and the benefit from this easy
 	 * hack makes up for the "good is the enemy of the best" effect.
 	 */
 	check_console(l);
 	/*
 	 * Need just enough stack to hold the faked-up "execve()" arguments.
 	 */
 	addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE);
 	if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE,
 	    NULL, UVM_UNKNOWN_OFFSET, 0,
 	    UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_RW, UVM_INH_COPY,
 	    UVM_ADV_NORMAL,
 	    UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0)
 		panic("init: couldn't allocate argument space");
 	p->p_vmspace->vm_maxsaddr = (void *)STACK_MAX(addr, PAGE_SIZE);
 	ipx = 0;
 	while (1) {
 		if (boothowto & RB_ASKNAME) {
 			printf("init path");
 			if (initpaths[ipx])
 				printf(" (default %s)", initpaths[ipx]);
 			printf(": ");
 			len = cngetsn(ipath, sizeof(ipath)-1);
 			if (len == 4 && strcmp(ipath, "halt") == 0) {
 				kern_reboot(RB_HALT, NULL);
 			} else if (len == 6 && strcmp(ipath, "reboot") == 0) {
 				kern_reboot(0, NULL);
 #if defined(DDB)
 			} else if (len == 3 && strcmp(ipath, "ddb") == 0) {
 				console_debugger();
 				continue;
 #endif
 			} else if (len > 0 && ipath[0] == '/') {
 				ipath[len] = '\0';
 				path = ipath;
 			} else if (len == 0 && initpaths[ipx] != NULL) {
 				path = initpaths[ipx++];
 			} else {
 				printf("use absolute path, ");
 #if defined(DDB)
 				printf("\"ddb\", ");
 #endif
 				printf("\"halt\", or \"reboot\"\n");
 				continue;
+			}
 		} else {
 			if ((path = initpaths[ipx++]) == NULL) {
 				ipx = 0;
 				boothowto |= RB_ASKNAME;
 				continue;
+			}
+		}
 		ucp = (char *)USRSTACK;
 		/*
 		 * Construct the boot flag argument.
 		 */
 		flagsp = flags;
 		*flagsp++ = '-';
 		options = 0;
 		if (boothowto & RB_SINGLE) {
 			*flagsp++ = 's';
 			options = 1;
+		}
 #ifdef notyet
 		if (boothowto & RB_FASTBOOT) {
 			*flagsp++ = 'f';
 			options = 1;
+		}
 #endif
 		/*
 		 * Move out the flags (arg 1), if necessary.
 		 */
 		if (options != 0) {
 			*flagsp++ = '\0';
 			i = flagsp - flags;
 #ifdef DEBUG
 			aprint_normal("init: copying out flags `%s' %d\n", flags, i);
 #endif
 			arg1 = STACK_ALLOC(ucp, i);
 			ucp = STACK_MAX(arg1, i);
 			if ((error = copyout((void *)flags, arg1, i)) != 0)
 				goto copyerr;
 		} else
 			arg1 = NULL;
 		/*
 		 * Move out the file name (also arg 0).
 		 */
 		i = strlen(path) + 1;
 #ifdef DEBUG
 		aprint_normal("init: copying out path `%s' %d\n", path, i);
 #else
 		if (boothowto & RB_ASKNAME || path != initpaths[0])
 			printf("init: trying %s\n", path);
 #endif
 		arg0 = STACK_ALLOC(ucp, i);
 		ucp = STACK_MAX(arg0, i);
 		if ((error = copyout(path, arg0, i)) != 0)
 			goto copyerr;
 		/*
 		 * Move out the arg pointers.
 		 */
 		ucp = (void *)STACK_ALIGN(ucp, STACK_ALIGNBYTES);
 		uap = (char **)STACK_ALLOC(ucp, sizeof(argv));
 		SCARG(&args, path) = arg0;
 		SCARG(&args, argp) = uap;
 		SCARG(&args, envp) = NULL;
 		slash = strrchr(path, '/');
 		argv[0] = slash ? arg0 + (slash + 1 - path) : arg0;
 		argv[1] = arg1;
 		argv[2] = NULL;
 		if ((error = copyout(argv, uap, sizeof(argv))) != 0)
 			goto copyerr;
 		/*
 		 * Now try to exec the program.  If it can't for any reason
 		 * other than it doesn't exist, complain.
 		 */
 		error = sys_execve(l, &args, retval);
 		if (error == 0 || error == EJUSTRETURN) {
 			KERNEL_UNLOCK_LAST(l);
 			return;
+		}
 		printf("exec %s: error %d\n", path, error);
+	}
 	printf("init: not found\n");
 	panic("no init");
 copyerr:
 	panic("copyout %d", error);
+}
 /*
  * calculate cache size (in bytes) from physmem and vsize.
  */
 vaddr_t
 calc_cache_size(vsize_t vsize, int pct, int va_pct)
+{
 	paddr_t t;
 	/* XXX should consider competing cache if any */
 	/* XXX should consider submaps */
 	t = (uintmax_t)physmem * pct / 100 * PAGE_SIZE;
 	if (vsize != 0) {
 		vsize = (uintmax_t)vsize * va_pct / 100;
 		if (t > vsize) {
 			t = vsize;
+		}
+	}
 	return t;
+}
 /*
  * Print the system start up banner.
+ *
  * - Print a limited banner if AB_SILENT.
  * - Always send normal banner to the log.
  */
 #define MEM_PBUFSIZE	sizeof("99999 MB")
 void
 banner(void)
+{
 	static char notice[] = " Notice: this software is "
 	    "protected by copyright";
 	char pbuf[81];
 	void (*pr)(const char *, ...) __printflike(1, 2);
 	int i;
 	if ((boothowto & AB_SILENT) != 0) {
 		snprintf(pbuf, sizeof(pbuf), "%s %s (%s)",
 		    ostype, osrelease, kernel_ident);
 		printf_nolog("%s", pbuf);
 		for (i = 80 - strlen(pbuf) - sizeof(notice); i > 0; i--)
 			printf(" ");
 		printf_nolog("%s\n", notice);
 		pr = aprint_normal;
 	} else {
 		pr = printf;
+	}
 	memset(pbuf, 0, sizeof(pbuf));
 	(*pr)("%s%s", copyright, version);
 	format_bytes(pbuf, MEM_PBUFSIZE, ctob((uint64_t)physmem));
 	(*pr)("total memory = %s\n", pbuf);
 	format_bytes(pbuf, MEM_PBUFSIZE, ctob((uint64_t)uvm_availmem()));
 	(*pr)("avail memory = %s\n", pbuf);
+}