usr/src/sys/kern/init_main.c

/*
 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)init_main.c 8.1 (Berkeley) %G%
 */

#include <sys/param.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/map.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/signalvar.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/conf.h>
#include <sys/buf.h>
#include <sys/clist.h>
#include <sys/device.h>
#include <sys/protosw.h>
#include <sys/reboot.h>
#include <sys/user.h>


#include <machine/cpu.h>

#include <vm/vm.h>

#ifdef HPFPLIB
char    copyright[] =
"Copyright (c) 1982, 1986, 1989, 1991, 1993\n\tThe Regents of the University of California.\nCopyright (c) 1992 Hewlett-Packard Company\nCopyright (c) 1992 Motorola Inc.\nAll rights reserved.\n\n";
#else
char    copyright[] =
"Copyright (c) 1982, 1986, 1989, 1991, 1993\n\tThe Regents of the University of California.  All rights reserved.\n\n";
#endif

/*
 * Components of process 0;
 * never freed.
 */
struct  session session0;
struct  pgrp pgrp0;
struct  proc proc0;
struct  pcred cred0;
struct  filedesc0 filedesc0;
struct  plimit limit0;
struct  vmspace vmspace0;
struct  proc *curproc = &proc0;
struct  proc *initproc, *pageproc;

int     cmask = CMASK;
extern  struct user *proc0paddr;
extern  int (*mountroot)();

struct  vnode *rootvp, *swapdev_vp;
int     boothowto;
struct  timeval boottime;
struct  timeval runtime;

/*
 * 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.
 */
main()
{
        register int i;
        register struct proc *p;
        register struct filedesc0 *fdp;
        register struct pdevinit *pdev;
        int s, rval[2];
        extern struct pdevinit pdevinit[];
        extern void roundrobin __P((void *));
        extern void schedcpu __P((void *));

        /*
         * Initialize curproc before any possible traps/probes
         * to simplify trap processing.
         */
        p = &proc0;
        curproc = p;
        /*
         * Attempt to find console and initialize
         * in case of early panic or other messages.
         */
        consinit();
        printf(copyright);

        vm_mem_init();
        kmeminit();
        cpu_startup();

        /*
         * set up system process 0 (swapper)
         */
        p = &proc0;
        curproc = p;

        allproc = (volatile struct proc *)p;
        p->p_prev = (struct proc **)&allproc;
        p->p_pgrp = &pgrp0;
        pgrphash[0] = &pgrp0;
        pgrp0.pg_mem = p;
        pgrp0.pg_session = &session0;
        session0.s_count = 1;
        session0.s_leader = p;

        p->p_flag = SLOAD|SSYS;
        p->p_stat = SRUN;
        p->p_nice = NZERO;
        bcopy("swapper", p->p_comm, sizeof ("swapper"));

        /*
         * Setup credentials
         */
        cred0.p_refcnt = 1;
        p->p_cred = &cred0;
        p->p_ucred = crget();
        p->p_ucred->cr_ngroups = 1;     /* group 0 */

        /*
         * Create the file descriptor table for process 0.
         */
        fdp = &filedesc0;
        p->p_fd = &fdp->fd_fd;
        fdp->fd_fd.fd_refcnt = 1;
        fdp->fd_fd.fd_cmask = cmask;
        fdp->fd_fd.fd_ofiles = fdp->fd_dfiles;
        fdp->fd_fd.fd_ofileflags = fdp->fd_dfileflags;
        fdp->fd_fd.fd_nfiles = NDFILE;

        /*
         * Set initial limits
         */
        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 = MAXUPRC;
        i = ptoa(cnt.v_free_count);
        limit0.pl_rlimit[RLIMIT_RSS].rlim_max = i;
        limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i;
        limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3;
        limit0.p_refcnt = 1;

        /*
         * Allocate a prototype map so we have something to fork
         */
        p->p_vmspace = &vmspace0;
        vmspace0.vm_refcnt = 1;
        pmap_pinit(&vmspace0.vm_pmap);
        vm_map_init(&p->p_vmspace->vm_map, round_page(VM_MIN_ADDRESS),
            trunc_page(VM_MAX_ADDRESS), TRUE);
        vmspace0.vm_map.pmap = &vmspace0.vm_pmap;
        p->p_addr = proc0paddr;                         /* XXX */

        /*
         * We continue to place resource usage info
         * and signal actions in the user struct so they're pageable.
         */
        p->p_stats = &p->p_addr->u_stats;
        p->p_sigacts = &p->p_addr->u_sigacts;

        /*
         * Initialize per uid information structure and charge
         * root for one process.
         */
        usrinfoinit();
        (void)chgproccnt(0, 1);

        rqinit();

        /* Configure virtual memory system, set vm rlimits. */
        vm_init_limits(p);

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

        /* Start real time and statistics clocks. */
        initclocks();

        /* Initialize tables. */
        mbinit();
        cinit();
#ifdef SYSVSHM
        shminit();
#endif

        /* Attach pseudo-devices. */
        for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++)
                (*pdev->pdev_attach)(pdev->pdev_count);

        /*
         * Initialize protocols.  Block reception of incoming packets
         * until everything is ready.
         */
        s = splimp();
        ifinit();
        domaininit();
        splx(s);

#ifdef GPROF
        kmstartup();
#endif

        /* kick off timeout driven events by calling first time */
        roundrobin(NULL);
        schedcpu(NULL);

        /*
         * Set up the root file system and vnode.
         */
        if ((*mountroot)())
                panic("cannot mount root");
        /*
         * Get vnode for '/'.
         * Setup rootdir and fdp->fd_fd.fd_cdir to point to it.
         */
        if (VFS_ROOT(rootfs, &rootdir))
                panic("cannot find root vnode");
        fdp->fd_fd.fd_cdir = rootdir;
        VREF(fdp->fd_fd.fd_cdir);
        VOP_UNLOCK(rootdir);
        fdp->fd_fd.fd_rdir = NULL;
        swapinit();

        /*
         * Now can look at time, having had a chance to verify the time
         * from the file system.  Reset p->p_rtime as it may have been
         * munched in swtch() after the time got set.
         */
        p->p_stats->p_start = runtime = mono_time = boottime = time;
        p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0;

        /*
         * make init process
         */
        siginit(p);
        if (fork(p, NULL, rval))
                panic("fork init");
        if (rval[1]) {
                extern int icode[];             /* user init code */
                extern int szicode;             /* size of icode */
                static char initflags[] = "-sf";
                vm_offset_t addr;
                char *ip;

                /*
                 * Now in process 1.  Set init flags into icode, get a minimal
                 * address space, copy out "icode", and return to it to do an
                 * exec of init.
                 */
                ip = initflags + 1;
                if (boothowto&RB_SINGLE)
                        *ip++ = 's';
#ifdef notyet
                if (boothowto&RB_FASTBOOT)
                        *ip++ = 'f';
#endif
                if (ip == initflags + 1)
                        *ip++ = '-';
                *ip++ = '\0';

                addr = VM_MIN_ADDRESS;
                initproc = p = curproc;
                if (vm_allocate(&p->p_vmspace->vm_map, &addr,
                    round_page(szicode + sizeof(initflags)), FALSE) != 0 ||
                    addr != VM_MIN_ADDRESS)
                        panic("init: couldn't allocate at zero");

                /* need just enough stack to exec from */
                addr = trunc_page(USRSTACK - PAGE_SIZE);
                if (vm_allocate(&p->p_vmspace->vm_map, &addr,
                    PAGE_SIZE, FALSE) != KERN_SUCCESS)
                        panic("vm_allocate init stack");
                p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
                (void)copyout((caddr_t)icode, (caddr_t)VM_MIN_ADDRESS,
                    (u_int)szicode);
                (void)copyout(initflags, (caddr_t)(VM_MIN_ADDRESS + szicode),
                    sizeof(initflags));
                return;                 /* returns to icode */
        }

        /*
         * Start up pageout daemon (process 2).
         */
        if (fork(p, NULL, rval))
                panic("fork pager");
        if (rval[1]) {
                /*
                 * Now in process 2.
                 */
                p = curproc;
                pageproc = p;
                p->p_flag |= SLOAD|SSYS;                /* XXX */
                bcopy("pagedaemon", curproc->p_comm, sizeof ("pagedaemon"));
                vm_pageout();
                /*NOTREACHED*/
        }

        /*
         * enter scheduling loop
         */
        sched();
}