[apple/xnu.git] / bsd / kern / bsd_init.c

/*
 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code 
 * as defined in and that are subject to the Apple Public Source License 
 * Version 2.0 (the 'License'). You may not use this file except in 
 * compliance with the License.  The rights granted to you under the 
 * License may not be used to create, or enable the creation or 
 * redistribution of, unlawful or unlicensed copies of an Apple operating 
 * system, or to circumvent, violate, or enable the circumvention or 
 * violation of, any terms of an Apple operating system software license 
 * agreement.
 *
 * Please obtain a copy of the License at 
 * http://www.opensource.apple.com/apsl/ and read it before using this 
 * file.
 *
 * The Original Code and all software distributed under the License are 
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * Please see the License for the specific language governing rights and 
 * limitations under the License.
 *
 * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
 */
/*
 * 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 8.16 (Berkeley) 5/14/95
 */

/* 
 *
 * Mach Operating System
 * Copyright (c) 1987 Carnegie-Mellon University
 * All rights reserved.  The CMU software License Agreement specifies
 * the terms and conditions for use and redistribution.
 */

#include <sys/param.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/mount_internal.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/systm.h>
#include <sys/vnode_internal.h>
#include <sys/conf.h>
#include <sys/buf_internal.h>
#include <sys/clist.h>
#include <sys/user.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/mman.h>

#include <bsm/audit_kernel.h>

#include <sys/malloc.h>
#include <sys/dkstat.h>

#include <kern/startup.h>
#include <kern/thread.h>
#include <kern/task.h>
#include <kern/ast.h>

#include <mach/vm_param.h>

#include <vm/vm_map.h>
#include <vm/vm_kern.h>

#include <sys/ux_exception.h>   /* for ux_exception_port */

#include <sys/reboot.h>
#include <mach/exception_types.h>
#include <dev/busvar.h>                 /* for pseudo_inits */
#include <sys/kdebug.h>

#include <mach/mach_types.h>
#include <mach/vm_prot.h>
#include <mach/semaphore.h>
#include <mach/sync_policy.h>
#include <kern/clock.h>
#include <mach/kern_return.h>

#include <mach/shared_memory_server.h>
#include <vm/vm_shared_memory_server.h>

#include <net/init.h>

#include <machine/exec.h>

extern int app_profile;         /* on/off switch for pre-heat cache */

char    copyright[] =
"Copyright (c) 1982, 1986, 1989, 1991, 1993\n\t"
"The Regents of the University of California. "
"All rights reserved.\n\n";

extern void     ux_handler();

/* Components of the first process -- never freed. */
struct  proc proc0;
struct  session session0;
struct  pgrp pgrp0;
struct  filedesc filedesc0;
struct  plimit limit0;
struct  pstats pstats0;
struct  sigacts sigacts0;
struct  proc *kernproc, *initproc;

long tk_cancc;
long tk_nin;
long tk_nout;
long tk_rawcc;

int lock_trace = 0;
/* Global variables to make pstat happy. We do swapping differently */
int nswdev, nswap;
int nswapmap;
void *swapmap;
struct swdevt swdevt[1];

dev_t   rootdev;                /* device of the root */
dev_t   dumpdev;                /* device to take dumps on */
long    dumplo;                 /* offset into dumpdev */
long    hostid;
char    hostname[MAXHOSTNAMELEN];
int             hostnamelen;
char    domainname[MAXDOMNAMELEN];
int             domainnamelen;
#if __i386__
struct exec_archhandler exec_archhandler_ppc = {
        .path = "/usr/libexec/oah/translate",
};
#else /* __i386__ */
struct exec_archhandler exec_archhandler_ppc;
#endif /* __i386__ */

char rootdevice[16];    /* hfs device names have at least 9 chars */

#ifdef  KMEMSTATS
struct  kmemstats kmemstats[M_LAST];
#endif

int     lbolt;                          /* awoken once a second */
struct  vnode *rootvp;
int boothowto = RB_DEBUG;

#define BSD_PAGABLE_MAP_SIZE    (16 * 512 * 1024)
vm_map_t        bsd_pageable_map;
vm_map_t        mb_map;
semaphore_t execve_semaphore;

int     cmask = CMASK;
extern int customnbuf;

int parse_bsd_args(void);
extern int bsd_hardclockinit;
extern task_t bsd_init_task;
extern char    init_task_failure_data[];
extern void time_zone_slock_init(void);
static void process_name(char *, struct proc *);

static void setconf(void);

funnel_t *kernel_flock;

extern void sysv_shm_lock_init(void);
extern void sysv_sem_lock_init(void);
extern void sysv_msg_lock_init(void);
extern void pshm_lock_init();
extern void psem_lock_init();
extern int maxprocperuid;

/* kmem access not enabled by default; can be changed with boot-args */
int setup_kmem = 0;

extern void stackshot_lock_init();

/*
 * Initialization code.
 * Called from cold start routine as
 * soon as a stack and segmentation
 * have been established.
 * Functions:
 *      turn on clock
 *      hand craft 0th process
 *      call all initialization routines
 *  hand craft 1st user process
 */

/*
 *      Sets the name for the given task.
 */
static void
process_name(s, p)
        char            *s;
        struct proc *p;
{
        int             length = strlen(s);

        bcopy(s, p->p_comm,
                length >= sizeof(p->p_comm) ? sizeof(p->p_comm) :
                        length + 1);
}

/* To allow these values to be patched, they're globals here */
#include <machine/vmparam.h>
struct rlimit vm_initial_limit_stack = { DFLSSIZ, MAXSSIZ };
struct rlimit vm_initial_limit_data = { DFLDSIZ, MAXDSIZ };
struct rlimit vm_initial_limit_core = { DFLCSIZ, MAXCSIZ };

extern thread_t cloneproc(struct proc *, int);
extern int      (*mountroot)(void);
extern int      netboot_mountroot();    /* netboot.c */
extern int      netboot_setup(struct proc * p);

lck_grp_t * proc_lck_grp;
lck_grp_attr_t * proc_lck_grp_attr;
lck_attr_t * proc_lck_attr;

/* hook called after root is mounted XXX temporary hack */
void (*mountroot_post_hook)(void);

/*
 * This function is called very early on in the Mach startup, from the
 * function start_kernel_threads() in osfmk/kern/startup.c.  It's called
 * in the context of the current (startup) task using a call to the
 * function kernel_thread_create() to jump into start_kernel_threads().
 * Internally, kernel_thread_create() calls thread_create_internal(),
 * which calls uthread_alloc().  The function of uthread_alloc() is
 * normally to allocate a uthread structure, and fill out the uu_sigmask,
 * uu_act, and uu_ucred fields.  It skips filling these out in the case
 * of the "task" being "kernel_task", because the order of operation is
 * inverted.  To account for that, we need to manually fill in at least
 * the uu_cred field so that the uthread structure can be used like any
 * other.
 */
void
bsd_init()
{
        register struct proc *p;
        struct uthread *ut;
        extern kauth_cred_t rootcred;
        register int i;
        int s;
        int error;
        thread_t        th;
        struct vfs_context context;
        void            lightning_bolt(void );
        kern_return_t   ret;
        boolean_t funnel_state;
        struct ucred temp_cred;
        extern void file_lock_init(void);

        kernel_flock = funnel_alloc(KERNEL_FUNNEL);
        if (kernel_flock == (funnel_t *)0 ) {
                panic("bsd_init: Failed to allocate kernel funnel");
        }
        
        funnel_state = thread_funnel_set(kernel_flock, TRUE);

        printf(copyright);
        
        kmeminit();
        
        parse_bsd_args();

        /* Initialize the uthread zone */
        //uthread_zone_init();  /* XXX redundant: previous uthread_alloc() */

        /* Initialize kauth subsystem before instancing the first credential */
        kauth_init();

        /* Initialize process and pgrp structures. */
        procinit();

        kernproc = &proc0;

        p = kernproc;

        /* kernel_task->proc = kernproc; */
        set_bsdtask_info(kernel_task,(void *)p);
        p->p_pid = 0;

        /* give kernproc a name */
        process_name("kernel_task", p);

        /* allocate proc lock group attribute and group */
        proc_lck_grp_attr= lck_grp_attr_alloc_init();
        
        proc_lck_grp = lck_grp_alloc_init("proc",  proc_lck_grp_attr);

        /* Allocate proc lock attribute */
        proc_lck_attr = lck_attr_alloc_init();

        lck_mtx_init(&p->p_mlock, proc_lck_grp, proc_lck_attr);
        lck_mtx_init(&p->p_fdmlock, proc_lck_grp, proc_lck_attr);

        if (current_task() != kernel_task)
                printf("bsd_init: We have a problem, "
                                "current task is not kernel task\n");
        
        ut = (uthread_t)get_bsdthread_info(current_thread());

        /*
         * Create process 0.
         */
        LIST_INSERT_HEAD(&allproc, p, p_list);
        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;
        session0.s_count = 1;
        session0.s_leader = p;

        p->task = kernel_task;
        
        p->p_stat = SRUN;
        p->p_flag = P_SYSTEM;
        p->p_nice = NZERO;
        p->p_pptr = p;
        lockinit(&p->signal_lock, PVM, "signal", 0, 0);
        TAILQ_INIT(&p->p_uthlist);
        p->sigwait = FALSE;
        p->sigwait_thread = THREAD_NULL;
        p->exit_thread = THREAD_NULL;

        /*
         * Create credential.  This also Initializes the audit information.
         * XXX It is not clear what the initial values should be for audit ID,
         * XXX session ID, etc..
         */
        bzero(&temp_cred, sizeof(temp_cred));
        temp_cred.cr_ngroups = 1;

        p->p_ucred = kauth_cred_create(&temp_cred); 

        /* give the (already exisiting) initial thread a reference on it */
        kauth_cred_ref(p->p_ucred);
        ut->uu_ucred = p->p_ucred;
        
        TAILQ_INIT(&p->aio_activeq);
        TAILQ_INIT(&p->aio_doneq);
        p->aio_active_count = 0;
        p->aio_done_count = 0;

        file_lock_init();

        /* Create the file descriptor table. */
        filedesc0.fd_refcnt = 1+1;      /* +1 so shutdown will not _FREE_ZONE */
        p->p_fd = &filedesc0;
        filedesc0.fd_cmask = cmask;
        filedesc0.fd_knlistsize = -1;
        filedesc0.fd_knlist = NULL;
        filedesc0.fd_knhash = NULL;
        filedesc0.fd_knhashmask = 0;

        /* Create the limits structures. */
        p->p_limit = &limit0;
        for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++)
                limit0.pl_rlimit[i].rlim_cur = 
                        limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY;
        limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE;
        limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = maxprocperuid;
        limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
        limit0.pl_rlimit[RLIMIT_STACK] = vm_initial_limit_stack;
        limit0.pl_rlimit[RLIMIT_DATA] = vm_initial_limit_data;
        limit0.pl_rlimit[RLIMIT_CORE] = vm_initial_limit_core;
        limit0.p_refcnt = 1;

        p->p_stats = &pstats0;
        p->p_sigacts = &sigacts0;

        /*
         * Charge root for two  processes: init and mach_init.
         */
        (void)chgproccnt(0, 1);

        /*
         *      Allocate a kernel submap for pageable memory
         *      for temporary copying (execve()).
         */
        {
                vm_offset_t     min;

                ret = kmem_suballoc(kernel_map,
                                &min,
                                (vm_size_t)BSD_PAGABLE_MAP_SIZE,
                                TRUE,
                                VM_FLAGS_ANYWHERE,
                                &bsd_pageable_map);
                if (ret != KERN_SUCCESS) 
                        panic("bsd_init: Failed to allocate bsd pageable map");
        }

        /*
         * Initialize buffers and hash links for buffers
         *
         * SIDE EFFECT: Starts a thread for bcleanbuf_thread(), so must
         *              happen after a credential has been associated with
         *              the kernel task.
         */
        bsd_bufferinit();

        /* Initialize the execve() semaphore */
        ret = semaphore_create(kernel_task, &execve_semaphore,
                        SYNC_POLICY_FIFO, (BSD_PAGABLE_MAP_SIZE / NCARGS));
        if (ret != KERN_SUCCESS)
                panic("bsd_init: Failed to create execve semaphore");

        /*
         * Initialize the calendar.
         */
        IOKitResetTime();

        ubc_init();

        /* Initialize the file systems. */
        vfsinit();

        /* Initialize mbuf's. */
        mbinit();

        /*
         * Initializes security event auditing.
         * XXX: Should/could this occur later?
         */
        audit_init();  

        /* Initialize kqueues */
        knote_init();

        /* Initialize for async IO */
        aio_init();

        /* Initialize pipes */
        pipeinit();

        /* Initialize SysV shm subsystem locks; the subsystem proper is
         * initialized through a sysctl.
         */
        sysv_shm_lock_init();
        sysv_sem_lock_init();
        sysv_msg_lock_init();
        pshm_lock_init();
        psem_lock_init();

        /* POSIX Shm and Sem */
        pshm_cache_init();
        psem_cache_init();
        time_zone_slock_init();

        /* Stack snapshot facility lock */
        stackshot_lock_init();
        /*
         * Initialize protocols.  Block reception of incoming packets
         * until everything is ready.
         */
        sysctl_register_fixed(); 
        sysctl_mib_init();
        dlil_init();
        proto_kpi_init();
        socketinit();
        domaininit();

        p->p_fd->fd_cdir = NULL;
        p->p_fd->fd_rdir = NULL;

#ifdef GPROF
        /* Initialize kernel profiling. */
        kmstartup();
#endif

        /* kick off timeout driven events by calling first time */
        thread_wakeup(&lbolt);
        timeout((void (*)(void *))lightning_bolt, 0, hz);

        bsd_autoconf();

        /*
         * We attach the loopback interface *way* down here to ensure
         * it happens after autoconf(), otherwise it becomes the
         * "primary" interface.
         */
#include <loop.h>
#if NLOOP > 0
        loopattach();                   /* XXX */
#endif
        
        /* Register the built-in dlil ethernet interface family */
        ether_family_init();

        /* Call any kext code that wants to run just after network init */
        net_init_run();

        vnode_pager_bootstrap();
#if 0
        /* XXX Hack for early debug stop */
        printf("\nabout to sleep for 10 seconds\n");
        IOSleep( 10 * 1000 );
        /* Debugger("hello"); */
#endif

        inittodr(0);

        /* Mount the root file system. */
        while( TRUE) {
                int err;

                setconf();
                bsd_hardclockinit = -1; /* start ticking */

                if (0 == (err = vfs_mountroot()))
                        break;
#if NFSCLIENT
                if (mountroot == netboot_mountroot) {
                        printf("cannot mount network root, errno = %d\n", err);
                        mountroot = NULL;
                        if (0 == (err = vfs_mountroot()))
                                break;
                }
#endif
                printf("cannot mount root, errno = %d\n", err);
                boothowto |= RB_ASKNAME;
        }

        context.vc_proc = p;
        context.vc_ucred = p->p_ucred;
        mountlist.tqh_first->mnt_flag |= MNT_ROOTFS;

        /* Get the vnode for '/'.  Set fdp->fd_fd.fd_cdir to reference it. */
        if (VFS_ROOT(mountlist.tqh_first, &rootvnode, &context))
                panic("bsd_init: cannot find root vnode");
        rootvnode->v_flag |= VROOT;
        (void)vnode_ref(rootvnode);
        (void)vnode_put(rootvnode);
        filedesc0.fd_cdir = rootvnode;

#if NFSCLIENT
        if (mountroot == netboot_mountroot) {
                int err;
                /* post mount setup */
                if (err = netboot_setup(p)) {
                        panic("bsd_init: NetBoot could not find root, %d", err);
                }
        }
#endif
        

        microtime(&p->p_stats->p_start);
        p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0;

#if DEVFS
        {
            extern void devfs_kernel_mount(char * str);
            
            devfs_kernel_mount("/dev");
        }
#endif /* DEVFS */
        
        /* Initialize signal state for process 0. */
        siginit(p);

        bsd_utaskbootstrap();

#if __i386__
        // this should be done after the root filesystem is mounted
        error = set_archhandler(p, CPU_TYPE_POWERPC);
        if (error)
                exec_archhandler_ppc.path[0] = 0;
#endif  
        
        /* invoke post-root-mount hook */
        if (mountroot_post_hook != NULL)
                mountroot_post_hook();
        
        (void) thread_funnel_set(kernel_flock, funnel_state);
}

/* Called with kernel funnel held */
void
bsdinit_task(void)
{
        struct proc *p = current_proc();
        struct uthread *ut;
        kern_return_t   kr;
        thread_t th_act;
        shared_region_mapping_t system_region;

        process_name("init", p);

        ux_handler_init();

        th_act = current_thread();
        (void) host_set_exception_ports(host_priv_self(),
                                        EXC_MASK_ALL & ~(EXC_MASK_SYSCALL |
                                                         EXC_MASK_MACH_SYSCALL |
                                                         EXC_MASK_RPC_ALERT),
                                        ux_exception_port,
                                        EXCEPTION_DEFAULT, 0);

        (void) task_set_exception_ports(get_threadtask(th_act),
                                        EXC_MASK_ALL & ~(EXC_MASK_SYSCALL |
                                                         EXC_MASK_MACH_SYSCALL |
                                                         EXC_MASK_RPC_ALERT),
                                        ux_exception_port,
                                        EXCEPTION_DEFAULT, 0);




        ut = (uthread_t)get_bsdthread_info(th_act);

        bsd_hardclockinit = 1;  /* Start bsd hardclock */
        bsd_init_task = get_threadtask(th_act);
        init_task_failure_data[0] = 0;
        system_region = lookup_default_shared_region(ENV_DEFAULT_ROOT, cpu_type());
        if (system_region == NULL) {
                shared_file_boot_time_init(ENV_DEFAULT_ROOT, cpu_type());
        } else {
                vm_set_shared_region(get_threadtask(th_act), system_region);
        }
        load_init_program(p);
        /* turn on app-profiling i.e. pre-heating */
        app_profile = 1;
        lock_trace = 1;
}

void
lightning_bolt()
{                       
        boolean_t       funnel_state;
        extern void klogwakeup(void);

        funnel_state = thread_funnel_set(kernel_flock, TRUE);

        thread_wakeup(&lbolt);
        timeout(lightning_bolt,0,hz);
        klogwakeup();

        (void) thread_funnel_set(kernel_flock, FALSE);
}

bsd_autoconf()
{
        extern kern_return_t IOKitBSDInit( void );

        kminit();

        /* 
         * Early startup for bsd pseudodevices.
         */
        {
            struct pseudo_init *pi;
        
            for (pi = pseudo_inits; pi->ps_func; pi++)
                (*pi->ps_func) (pi->ps_count);
        }

        return( IOKitBSDInit());
}


#include <sys/disklabel.h>  /* for MAXPARTITIONS */

static void
setconf(void)
{       
        extern kern_return_t IOFindBSDRoot( char * rootName,
                                dev_t * root, u_int32_t * flags );
        u_int32_t       flags;
        kern_return_t   err;

        /*
         * calls into IOKit can generate networking registrations
         * which needs to be under network funnel. Right thing to do
         * here is to drop the funnel alltogether and regrab it afterwards
         */
        thread_funnel_set(kernel_flock, FALSE);
        err = IOFindBSDRoot( rootdevice, &rootdev, &flags );
        thread_funnel_set(kernel_flock, TRUE);
        if( err) {
                printf("setconf: IOFindBSDRoot returned an error (%d);"
                        "setting rootdevice to 'sd0a'.\n", err); /* XXX DEBUG TEMP */
                rootdev = makedev( 6, 0 );
                strcpy( rootdevice, "sd0a" );
                flags = 0;
        }

#if NFSCLIENT
        if( flags & 1 ) {
                /* network device */
                mountroot = netboot_mountroot;
        } else {
#endif
                /* otherwise have vfs determine root filesystem */
                mountroot = NULL;
#if NFSCLIENT
        }
#endif

}

bsd_utaskbootstrap()
{
        thread_t th_act;
        struct uthread *ut;

        th_act = cloneproc(kernproc, 0);
        initproc = pfind(1);                            
        /* Set the launch time for init */
        microtime(&initproc->p_stats->p_start);

        ut = (struct uthread *)get_bsdthread_info(th_act);
        ut->uu_sigmask = 0;
        act_set_astbsd(th_act);
        (void) thread_resume(th_act);
}

parse_bsd_args()
{
        extern char init_args[];
        char    namep[16];
        extern int boothowto;
        extern int srv;
        extern int ncl;

        int len;

        if (PE_parse_boot_arg("-s", namep)) {
                boothowto |= RB_SINGLE;
                len = strlen(init_args);
                if(len != 0)
                        strcat(init_args," -s");
                else
                        strcat(init_args,"-s");
        }

        if (PE_parse_boot_arg("-b", namep)) {
                boothowto |= RB_NOBOOTRC;
                len = strlen(init_args);
                if(len != 0)
                        strcat(init_args," -b");
                else
                        strcat(init_args,"-b");
        }

        if (PE_parse_boot_arg("-F", namep)) {
                len = strlen(init_args);
                if(len != 0)
                        strcat(init_args," -F");
                else
                        strcat(init_args,"-F");
        }

        if (PE_parse_boot_arg("-v", namep)) {
                len = strlen(init_args);
                if(len != 0)
                        strcat(init_args," -v");
                else
                        strcat(init_args,"-v");
        }

        if (PE_parse_boot_arg("-x", namep)) { /* safe boot */
                len = strlen(init_args);
                if(len != 0)
                        strcat(init_args," -x");
                else
                        strcat(init_args,"-x");
        }

        if (PE_parse_boot_arg("-d", namep)) {
                len = strlen(init_args);
                if(len != 0)
                        strcat(init_args," -d");
                else
                        strcat(init_args,"-d");
        }

        PE_parse_boot_arg("srv", &srv);
        PE_parse_boot_arg("ncl", &ncl);
        if (PE_parse_boot_arg("nbuf", &max_nbuf_headers)) 
                customnbuf = 1;
        PE_parse_boot_arg("kmem", &setup_kmem);

        return 0;
}

#if !NFSCLIENT
int 
netboot_root(void)
{
        return(0);
}
#endif