HAMMER 60I/Many: Mirroring

[dragonfly.git] / sys / kern / init_main.c

/*
 * 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
 * $FreeBSD: src/sys/kern/init_main.c,v 1.134.2.8 2003/06/06 20:21:32 tegge Exp $
 * $DragonFly: src/sys/kern/init_main.c,v 1.87 2008/06/07 11:37:23 mneumann Exp $
 */

#include "opt_init_path.h"

#include <sys/param.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/signalvar.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/sysent.h>
#include <sys/reboot.h>
#include <sys/sysproto.h>
#include <sys/vmmeter.h>
#include <sys/unistd.h>
#include <sys/malloc.h>
#include <sys/machintr.h>
#include <sys/file2.h>
#include <sys/thread2.h>
#include <sys/sysref2.h>
#include <sys/spinlock2.h>

#include <machine/cpu.h>

#include <vm/vm.h>
#include <vm/vm_param.h>
#include <sys/lock.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_extern.h>
#include <sys/user.h>
#include <sys/copyright.h>

/* Components of the first process -- never freed. */
static struct session session0;
static struct pgrp pgrp0;
static struct sigacts sigacts0;
static struct filedesc filedesc0;
static struct plimit limit0;
static struct vmspace vmspace0;
struct proc *initproc;
struct proc proc0;
struct lwp lwp0;
struct thread thread0;

int cmask = CMASK;
extern  struct user *proc0paddr;
extern int fallback_elf_brand;

int     boothowto = 0;          /* initialized so that it can be patched */
SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, "");

/*
 * This ensures that there is at least one entry so that the sysinit_set
 * symbol is not undefined.  A subsystem ID of SI_SPECIAL_DUMMY is never
 * executed.
 */
SYSINIT(placeholder, SI_SPECIAL_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.
 */
SET_DECLARE(sysinit_set, struct sysinit);
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 = kmalloc(count * sizeof(*sipp), M_TEMP, M_WAITOK);
        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)
                kfree(newsysinit, M_TEMP);
        newsysinit = newset;
        newsysinit_end = newset + count;
}

/*
 * Callbacks from machine-dependant startup code (e.g. init386) to set
 * up low level entities related to cpu #0's globaldata.
 *
 * Called from very low level boot code.
 */
void
mi_proc0init(struct globaldata *gd, struct user *proc0paddr)
{
        lwkt_init_thread(&thread0, proc0paddr, LWKT_THREAD_STACK, 0, gd);
        lwkt_set_comm(&thread0, "thread0");
        RB_INIT(&proc0.p_lwp_tree);
        spin_init(&proc0.p_spin);
        proc0.p_lasttid = 0;    /* +1 = next TID */
        lwp_rb_tree_RB_INSERT(&proc0.p_lwp_tree, &lwp0);
        lwp0.lwp_thread = &thread0;
        lwp0.lwp_proc = &proc0;
        proc0.p_usched = usched_init();
        lwp0.lwp_cpumask = 0xFFFFFFFF;
        varsymset_init(&proc0.p_varsymset, NULL);
        thread0.td_flags |= TDF_RUNNING;
        thread0.td_proc = &proc0;
        thread0.td_lwp = &lwp0;
        thread0.td_switch = cpu_heavy_switch;   /* YYY eventually LWKT */
        lwkt_schedule_self(curthread);
}

/*
 * 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)
{
        struct sysinit *sip;            /* system initialization*/
        struct sysinit **sipp;          /* system initialization*/
        struct sysinit **xipp;          /* interior loop of sort*/
        struct sysinit *save;           /* bubble*/

        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;
                }
        }

        /*
         * 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++) {
                sip = *sipp;
                if (sip->subsystem == SI_SPECIAL_DUMMY)
                        continue;       /* skip dummy task(s)*/

                if (sip->subsystem == SI_SPECIAL_DONE)
                        continue;

                /* Call function */
                (*(sip->func))(sip->udata);

                /* Check off the one we're just done */
                sip->subsystem = SI_SPECIAL_DONE;

                /* Check if we've installed more sysinit items via KLD */
                if (newsysinit != NULL) {
                        if (sysinit != SET_BEGIN(sysinit_set))
                                kfree(sysinit, M_TEMP);
                        sysinit = newsysinit;
                        sysinit_end = newsysinit_end;
                        newsysinit = NULL;
                        newsysinit_end = NULL;
                        goto restart;
                }
        }

        panic("Shouldn't get here!");
        /* NOTREACHED*/
}


/*
 ***************************************************************************
 ****
 **** The following SYSINIT's belong elsewhere, but have not yet
 **** been moved.
 ****
 ***************************************************************************
 */
static void
print_caddr_t(void *data __unused)
{
        kprintf("%s", (char *)data);
}
SYSINIT(announce, SI_BOOT1_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, copyright)

/*
 * Leave the critical section that protected us from spurious interrupts
 * so device probes work.
 */
static void
leavecrit(void *dummy __unused)
{
        MachIntrABI.finalize();
        cpu_enable_intr();
        MachIntrABI.cleanup();
        crit_exit();
        KKASSERT(!IN_CRITICAL_SECT(curthread));

        if (bootverbose)
                kprintf("Leaving critical section, allowing interrupts\n");
}
SYSINIT(leavecrit, SI_BOOT2_LEAVE_CRIT, SI_ORDER_ANY, leavecrit, NULL)

/*
 * This is called after the threading system is up and running,
 * including the softclock, clock interrupts, and SMP.
 */
static void
tsleepworks(void *dummy __unused)
{
        tsleep_now_works = 1;
}
SYSINIT(tsleepworks, SI_BOOT2_FINISH_SMP, SI_ORDER_SECOND, tsleepworks, NULL)

/*
 * This is called after devices have configured.  Tell the kernel we are
 * no longer in cold boot.
 */
static void
endofcoldboot(void *dummy __unused)
{
        cold = 0;
}
SYSINIT(endofcoldboot, SI_SUB_ISWARM, SI_ORDER_ANY, endofcoldboot, NULL)

/*
 ***************************************************************************
 ****
 **** The two following SYSINT'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)
{
        struct proc *p;
        struct lwp *lp;

        p = &proc0;
        lp = &lwp0;

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

        /*
         * additional VM structures
         */
        vm_init2();

        /*
         * Create process 0 (the swapper).
         */
        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->p_sysent = &aout_sysvec;

        p->p_flag = P_SYSTEM;
        p->p_stat = SACTIVE;
        lp->lwp_stat = LSRUN;
        p->p_nice = NZERO;
        p->p_rtprio.type = RTP_PRIO_NORMAL;
        p->p_rtprio.prio = 0;
        lp->lwp_rtprio = p->p_rtprio;

        p->p_peers = 0;
        p->p_leader = p;

        bcopy("swapper", p->p_comm, sizeof ("swapper"));
        bcopy("swapper", thread0.td_comm, sizeof ("swapper"));

        /* Create credentials. */
        p->p_ucred = crget();
        p->p_ucred->cr_ruidinfo = uifind(0);
        p->p_ucred->cr_ngroups = 1;     /* group 0 */
        p->p_ucred->cr_uidinfo = uifind(0);

        /* Don't jail it */
        p->p_ucred->cr_prison = NULL;

        /* Create sigacts. */
        p->p_sigacts = &sigacts0;
        p->p_sigacts->ps_refcnt = 1;

        /* Initialize signal state for process 0. */
        siginit(p);

        /* Create the file descriptor table. */
        fdinit_bootstrap(p, &filedesc0, cmask);

        /* Create the limits structures. */
        plimit_init0(&limit0);
        p->p_limit = &limit0;

        /* Allocate a prototype map so we have something to fork. */
        pmap_pinit0(vmspace_pmap(&vmspace0));
        p->p_vmspace = &vmspace0;
        lp->lwp_vmspace = p->p_vmspace;
        sysref_init(&vmspace0.vm_sysref, &vmspace_sysref_class);
        vm_map_init(&vmspace0.vm_map,
                    round_page(VM_MIN_USER_ADDRESS),
                    trunc_page(VM_MAX_USER_ADDRESS),
                    vmspace_pmap(&vmspace0));
        sysref_activate(&vmspace0.vm_sysref);

        /*
         * Charge root for one process.
         */
        (void)chgproccnt(p->p_ucred->cr_uidinfo, 1, 0);
        vm_init_limits(p);
}
SYSINIT(p0init, SI_BOOT2_PROC0, SI_ORDER_FIRST, proc0_init, NULL)

static int proc0_post_callback(struct proc *p, void *data __unused);

/* ARGSUSED*/
static void
proc0_post(void *dummy __unused)
{
        struct timespec ts;

        /*
         * Now we can look at the time, having had a chance to verify the
         * time from the file system.  Pretend that proc0 started now.
         */
        allproc_scan(proc0_post_callback, NULL);

        /*
         * Give the ``random'' number generator a thump.
         * XXX: Does read_random() contain enough bits to be used here ?
         */
        nanotime(&ts);
        skrandom(ts.tv_sec ^ ts.tv_nsec);
}

static int
proc0_post_callback(struct proc *p, void *data __unused)
{
        microtime(&p->p_start);
        return(0);
}

SYSINIT(p0post, SI_SUB_PROC0_POST, SI_ORDER_FIRST, proc0_post, 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";
#endif
SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 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.
 *
 * The MP lock is held on entry.
 */
static void
start_init(void *dummy, struct trapframe *frame)
{
        vm_offset_t addr;
        struct execve_args args;
        int options, error;
        char *var, *path, *next, *s;
        char *ucp, **uap, *arg0, *arg1;
        struct proc *p;
        struct lwp *lp;
        struct mount *mp;
        struct vnode *vp;

        p = curproc;

        lp = ONLY_LWP_IN_PROC(p);

        /* Get the vnode for '/'.  Set p->p_fd->fd_cdir to reference it. */
        mp = mountlist_boot_getfirst();
        if (VFS_ROOT(mp, &vp))
                panic("cannot find root vnode");
        if (mp->mnt_ncmountpt.ncp == NULL) {
                cache_allocroot(&mp->mnt_ncmountpt, mp, vp);
                cache_unlock(&mp->mnt_ncmountpt);       /* leave ref intact */
        }
        p->p_fd->fd_cdir = vp;
        vref(p->p_fd->fd_cdir);
        p->p_fd->fd_rdir = vp;
        vref(p->p_fd->fd_rdir);
        vfs_cache_setroot(vp, cache_hold(&mp->mnt_ncmountpt));
        vn_unlock(vp);                  /* leave ref intact */
        cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_ncdir);
        cache_copy(&mp->mnt_ncmountpt, &p->p_fd->fd_nrdir);

        /*
         * Need just enough stack to hold the faked-up "execve()" arguments.
         */
        addr = trunc_page(USRSTACK - PAGE_SIZE);
        error = vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
                            FALSE, 
                            VM_MAPTYPE_NORMAL,
                            VM_PROT_ALL, VM_PROT_ALL,
                            0);
        if (error)
                panic("init: couldn't allocate argument space");
        p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
        p->p_vmspace->vm_ssize = 1;

        if ((var = kgetenv("init_path")) != NULL) {
                strncpy(init_path, var, sizeof init_path);
                init_path[sizeof init_path - 1] = 0;
        }
        if ((var = kgetenv("kern.fallback_elf_brand")) != NULL)
                fallback_elf_brand = strtol(var, NULL, 0);
        
        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)
                        kprintf("start_init: trying %.*s\n", (int)(next - path),
                            path);
                        
                /*
                 * Move out the boot flag argument.
                 */
                options = 0;
                ucp = (char *)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!
                 *
                 * WARNING!  We may have been moved to another cpu after
                 * acquiring the current user process designation.  The
                 * MP lock will migrate with us though so we still have to
                 * release it.
                 */
                if ((error = sys_execve(&args)) == 0) {
                        rel_mplock();
                        lp->lwp_proc->p_usched->acquire_curproc(lp);
                        return;
                }
                if (error != ENOENT)
                        kprintf("exec %.*s: error %d\n", (int)(next - path), 
                            path, error);
        }
        kprintf("init: not found in path %s\n", init_path);
        panic("no init");
}

/*
 * Like kthread_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)
{
        int error;
        struct lwp *lp;

        crit_enter();
        error = fork1(&lwp0, RFFDG | RFPROC, &initproc);
        if (error)
                panic("cannot fork init: %d", error);
        initproc->p_flag |= P_SYSTEM;
        lp = ONLY_LWP_IN_PROC(initproc);
        cpu_set_fork_handler(lp, start_init, NULL);
        crit_exit();
}
SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL)

/*
 * Make it runnable now.
 */
static void
kick_init(const void *udata __unused)
{
        start_forked_proc(&lwp0, initproc);
}
SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL)

/*
 * Machine independant globaldata initialization
 *
 * WARNING!  Called from early boot, 'mycpu' may not work yet.
 */
void
mi_gdinit(struct globaldata *gd, int cpuid)
{
        TAILQ_INIT(&gd->gd_systimerq);
        gd->gd_sysid_alloc = cpuid;     /* prime low bits for cpu lookup */
        gd->gd_cpuid = cpuid;
        gd->gd_cpumask = (cpumask_t)1 << cpuid;
        lwkt_gdinit(gd);
        vm_map_entry_reserve_cpu_init(gd);
        sleep_gdinit(gd);
}