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[unix-history] / usr / src / sys / kern / init_main.c

/*      init_main.c     4.27    82/03/14        */

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/filsys.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/mtpr.h"
#include "../h/pte.h"
#include "../h/clock.h"
#include "../h/vm.h"
#include "../h/cmap.h"
#include "../h/text.h"
#include "../h/vlimit.h"
#include "../h/clist.h"
#ifdef INET
#include "../h/protosw.h"
#endif

/*
* 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)
{
       register int i;
       register struct proc *p;

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

       /*
        * set up system process 0 (swapper)
        */
       p = &proc[0];
       p->p_p0br = (struct pte *)mfpr(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 < sizeof(u.u_limit)/sizeof(u.u_limit[0]); i++)
               switch (i) {

               case LIM_STACK:
                       u.u_limit[i] = 512*1024;
                       continue;
               case LIM_DATA:
                       u.u_limit[i] = ctob(MAXDSIZ);
                       continue;
               default:
                       u.u_limit[i] = INFINITY;
                       continue;
               }
       p->p_maxrss = INFINITY/NBPG;
       clkstart();

       /*
        * Initialize tables, protocols, and set up well-known inodes.
        */
       mbinit();
       cinit();                        /* needed by dmc-11 driver */
#ifdef INET
       pfinit();
#if NLOOP > 0
       loattach();                     /* XXX */
#endif
       ifinit();
#endif
       ihinit();
       bhinit();
       binit();
       bswinit();
       iinit();
       rootdir = iget(rootdev, (ino_t)ROOTINO);
       rootdir->i_flag &= ~ILOCK;
       u.u_cdir = iget(rootdev, (ino_t)ROOTINO);
       u.u_cdir->i_flag &= ~ILOCK;
       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();
       }

       /*
        * 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)), P0BR);
               (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();
}

/*
* iinit is called once (from main)
* very early in initialization.
* It reads the root's super block
* and initializes the current date
* from the last modified date.
*
* panic: iinit -- cannot read the super
* block. Usually because of an IO error.
*/
iinit()
{
       register struct buf *bp;
       register struct filsys *fp;
       register int i;

       (*bdevsw[major(rootdev)].d_open)(rootdev, 1);
       bp = bread(rootdev, SUPERB);
       if(u.u_error)
               panic("iinit");
       bp->b_flags |= B_LOCKED;                /* block can never be re-used */
       brelse(bp);
       mount[0].m_dev = rootdev;
       mount[0].m_bufp = bp;
       fp = bp->b_un.b_filsys;
       fp->s_flock = 0;
       fp->s_ilock = 0;
       fp->s_ronly = 0;
       fp->s_lasti = 1;
       fp->s_nbehind = 0;
       fp->s_fsmnt[0] = '/';
       for (i = 1; i < sizeof(fp->s_fsmnt); i++)
               fp->s_fsmnt[i] = 0;
       clkinit(fp->s_time);
       bootime = time;
}

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

       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;
       }
       dp--;                           /* dp = &bfreelist[BQUEUES-1]; */
       for (i=0; i<nbuf; i++) {
               bp = &buf[i];
               bp->b_dev = NODEV;
               bp->b_un.b_addr = buffers + i * BSIZE;
               bp->b_back = dp;
               bp->b_forw = dp->b_forw;
               dp->b_forw->b_back = bp;
               dp->b_forw = bp;
               bp->b_flags = B_BUSY|B_INVAL;
               brelse(bp);
       }
       for (bdp = bdevsw; bdp->d_open; bdp++)
               nblkdev++;
       /*
        * 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;
       for (swp = swdevt; swp->sw_dev; swp++)
               nswdev++;
       if (nswdev == 0)
               panic("binit");
       if (nswdev > 1)
               nswap = (nswap/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;
       register struct cdevsw *cdp;

       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;
       }
       ccp = 0;
       for(cdp = cdevsw; cdp->d_open; cdp++)
               ccp++;
       nchrdev = ccp;
}