usr/src/sys/kern/init_main.c

/*      init_main.c     4.53    83/07/01        */

#include "../machine/pte.h"

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/kernel.h"
#include "../h/fs.h"
#include "../h/mount.h"
#include "../h/map.h"
#include "../h/proc.h"
#include "../h/inode.h"
#include "../h/seg.h"
#include "../h/conf.h"
#include "../h/buf.h"
#include "../h/vm.h"
#include "../h/cmap.h"
#include "../h/text.h"
#include "../h/clist.h"
#ifdef INET
#include "../h/protosw.h"
#endif
#include "../h/quota.h"
#include "../machine/reg.h"
#include "../machine/cpu.h"

extern  struct user u;          /* have to declare it somewhere! */
/*
 * Initialization code.
 * Called from cold start routine as
 * soon as a stack and segmentation
 * have been established.
 * Functions:
 *      clear and free user core
 *      turn on clock
 *      hand craft 0th process
 *      call all initialization routines
 *      fork - process 0 to schedule
 *           - process 2 to page out
 *           - process 1 execute bootstrap
 *
 * loop at loc 13 (0xd) in user mode -- /etc/init
 *      cannot be executed.
 */
main(firstaddr)
        int firstaddr;
{
        register int i;
        register struct proc *p;
        struct fs *fs;
        int s;

        rqinit();
#include "loop.h"
        startup(firstaddr);

        /*
         * set up system process 0 (swapper)
         */
        p = &proc[0];
        p->p_p0br = u.u_pcb.pcb_p0br;
        p->p_szpt = 1;
        p->p_addr = uaddr(p);
        p->p_stat = SRUN;
        p->p_flag |= SLOAD|SSYS;
        p->p_nice = NZERO;
        setredzone(p->p_addr, (caddr_t)&u);
        u.u_procp = p;
        u.u_cmask = CMASK;
        for (i = 1; i < NGROUPS; i++)
                u.u_groups[i] = NOGROUP;
        for (i = 0; i < sizeof(u.u_rlimit)/sizeof(u.u_rlimit[0]); i++)
                u.u_rlimit[i].rlim_cur = u.u_rlimit[i].rlim_max =
                    RLIM_INFINITY;
        u.u_rlimit[RLIMIT_STACK].rlim_cur = 512*1024;
        u.u_rlimit[RLIMIT_STACK].rlim_max = ctob(MAXDSIZ);
        u.u_rlimit[RLIMIT_DATA].rlim_max =
            u.u_rlimit[RLIMIT_DATA].rlim_cur = ctob(MAXDSIZ);
        p->p_maxrss = RLIM_INFINITY/NBPG;
#ifdef QUOTA
        qtinit();
        p->p_quota = u.u_quota = getquota(0, 0, Q_NDQ);
#endif
        startrtclock();
#include "kg.h"
#if NKG > 0
        startkgclock();
#endif

        /*
         * Initialize tables, protocols, and set up well-known inodes.
         */
        mbinit();
        cinit();                        /* needed by dmc-11 driver */
#ifdef INET
#if NLOOP > 0
        loattach();                     /* XXX */
#endif
        /*
         * Block reception of incoming packets
         * until protocols have been initialized.
         */
        s = splimp();
        ifinit();
#endif
        domaininit();
#ifdef INET
        splx(s);
#endif
        ihinit();
        bhinit();
        binit();
        bswinit();
#ifdef GPROF
        kmstartup();
#endif

        fs = mountfs(rootdev, 0, (struct inode *)0);
        if (fs == 0)
                panic("iinit");
        bcopy("/", fs->fs_fsmnt, 2);

        inittodr(fs->fs_time);
        boottime = time;

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

/* set up the root file system */
        rootdir = iget(rootdev, fs, (ino_t)ROOTINO);
        iunlock(rootdir);
        u.u_cdir = iget(rootdev, fs, (ino_t)ROOTINO);
        iunlock(u.u_cdir);
        u.u_rdir = NULL;

        u.u_dmap = zdmap;
        u.u_smap = zdmap;

        /*
         * Set the scan rate and other parameters of the paging subsystem.
         */
        setupclock();

        /*
         * make page-out daemon (process 2)
         * the daemon has ctopt(nswbuf*CLSIZE*KLMAX) pages of page
         * table so that it can map dirty pages into
         * its address space during asychronous pushes.
         */
        mpid = 1;
        proc[0].p_szpt = clrnd(ctopt(nswbuf*CLSIZE*KLMAX + UPAGES));
        proc[1].p_stat = SZOMB;         /* force it to be in proc slot 2 */
        if (newproc(0)) {
                proc[2].p_flag |= SLOAD|SSYS;
                proc[2].p_dsize = u.u_dsize = nswbuf*CLSIZE*KLMAX;
                pageout();
                /*NOTREACHED*/
        }

        /*
         * make init process and
         * enter scheduling loop
         */

        mpid = 0;
        proc[1].p_stat = 0;
        proc[0].p_szpt = CLSIZE;
        if (newproc(0)) {
                expand(clrnd((int)btoc(szicode)), 0);
                (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap);
                (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode);
                /*
                 * Return goes to loc. 0 of user init
                 * code just copied out.
                 */
                return;
        }
        proc[0].p_szpt = 1;
        sched();
}

/*
 * Initialize hash links for buffers.
 */
bhinit()
{
        register int i;
        register struct bufhd *bp;

        for (bp = bufhash, i = 0; i < BUFHSZ; i++, bp++)
                bp->b_forw = bp->b_back = (struct buf *)bp;
}

/*
 * Initialize the buffer I/O system by freeing
 * all buffers and setting all device buffer lists to empty.
 */
binit()
{
        register struct buf *bp, *dp;
        register int i;
        struct swdevt *swp;
        int base, residual;

        for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) {
                dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp;
                dp->b_flags = B_HEAD;
        }
        base = bufpages / nbuf;
        residual = bufpages % nbuf;
        for (i = 0; i < nbuf; i++) {
                bp = &buf[i];
                bp->b_dev = NODEV;
                bp->b_bcount = 0;
                bp->b_un.b_addr = buffers + i * MAXBSIZE;
                if (i < residual)
                        bp->b_bufsize = (base + 1) * CLBYTES;
                else
                        bp->b_bufsize = base * CLBYTES;
                binshash(bp, &bfreelist[BQ_AGE]);
                bp->b_flags = B_BUSY|B_INVAL;
                brelse(bp);
        }
        /*
         * Count swap devices, and adjust total swap space available.
         * Some of this space will not be available until a vswapon()
         * system is issued, usually when the system goes multi-user.
         */
        nswdev = 0;
        nswap = 0;
        for (swp = swdevt; swp->sw_dev; swp++) {
                nswdev++;
                if (swp->sw_nblks > nswap)
                        nswap = swp->sw_nblks;
        }
        if (nswdev == 0)
                panic("binit");
        if (nswdev > 1)
                nswap = ((nswap + dmmax - 1) / dmmax) * dmmax;
        nswap *= nswdev;
        maxpgio *= nswdev;
        swfree(0);
}

/*
 * Initialize linked list of free swap
 * headers. These do not actually point
 * to buffers, but rather to pages that
 * are being swapped in and out.
 */
bswinit()
{
        register int i;
        register struct buf *sp = swbuf;

        bswlist.av_forw = sp;
        for (i=0; i<nswbuf-1; i++, sp++)
                sp->av_forw = sp+1;
        sp->av_forw = NULL;
}

/*
 * Initialize clist by freeing all character blocks, then count
 * number of character devices. (Once-only routine)
 */
cinit()
{
        register int ccp;
        register struct cblock *cp;

        ccp = (int)cfree;
        ccp = (ccp+CROUND) & ~CROUND;
        for(cp=(struct cblock *)ccp; cp < &cfree[nclist-1]; cp++) {
                cp->c_next = cfreelist;
                cfreelist = cp;
                cfreecount += CBSIZE;
        }
}