V7M/sys/sys/main.c

#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"

/*
 * 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 1 execute bootstrap
 *
 * loop at low address in user mode -- /etc/init
 *	cannot be executed.
 */
main()
{

	startup();
	/*
	 * set up system process
	 */

	proc[0].p_addr = ka6->r[0];
	proc[0].p_size = USIZE;
	proc[0].p_stat = SRUN;
	proc[0].p_flag |= SLOAD|SSYS;
	proc[0].p_nice = NZERO;
	u.u_procp = &proc[0];
	u.u_cmask = CMASK;

	/*
	 * Initialize devices and
	 * set up 'known' i-nodes
	 */

/*	clkstart();	*/
	cinit();
	binit();
	iinit();
/*
 * clkstart() was moved to here, because
 * if there is no clock on the system `panic no clock'
 * is called. This is incorrect because panic calls update
 * which will not work due to the buffers not having
 * been initialized yet.
 * Fred Canter 8/30/81
 */
	clkstart();
	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;

	/*
	 * make init process
	 * enter scheduling loop
	 * with system process
	 */

	if(newproc()) {
		expand(USIZE + (int)btoc(szicode));
		estabur((unsigned)0, btoc(szicode), (unsigned)0, 0, RO);
		copyout((caddr_t)icode, (caddr_t)0, szicode);
		/*
		 * Return goes to loc. 0 of user init
		 * code just copied out.
		 */
		return;
	}
	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 *cp, *bp;
	register struct filsys *fp;

	(*bdevsw[major(rootdev)].d_open)(rootdev, 1);
	bp = bread(rootdev, SUPERB);
	cp = geteblk();
	if(u.u_error)
		panic("iinit");
	bcopy(bp->b_un.b_addr, cp->b_un.b_addr, sizeof(struct filsys));
	brelse(bp);
	mount[0].m_bufp = cp;
	mount[0].m_dev = rootdev;
	fp = cp->b_un.b_filsys;
	fp->s_flock = 0;
	fp->s_ilock = 0;
	fp->s_ronly = 0;
	time = fp->s_time;
}

/*
 * This is the set of buffers proper, whose heads
 * were declared in buf.h.  There can exist buffer
 * headers not pointing here that are used purely
 * as arguments to the I/O routines to describe
 * I/O to be done-- e.g. swbuf for
 * swapping.
 */
char	buffers[NBUF][BSIZE+BSLOP];

/*
 * 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;

	bfreelist.b_forw = bfreelist.b_back =
	    bfreelist.av_forw = bfreelist.av_back = &bfreelist;
	for (i=0; i<NBUF; i++) {
		bp = &buf[i];
		bp->b_dev = NODEV;
		bp->b_un.b_addr = buffers[i];
		bp->b_back = &bfreelist;
		bp->b_forw = bfreelist.b_forw;
		bfreelist.b_forw->b_back = bp;
		bfreelist.b_forw = bp;
		bp->b_flags = B_BUSY;
		brelse(bp);
	}
	for (bdp = bdevsw; bdp->d_open; bdp++) {
		dp = bdp->d_tab;
/*
 * If any massbus devices (hp, ml, ht) are in the
 * configuration table (bdevsw[]), check the controller
 * type. Set it to RH70 if the bus address extension
 * register is present.
 */
#define	HSBAE	((physadr) 0172070)
#define	MLBAE	((physadr) 0176450)
#define	HPBAE	((physadr) 0176750)
#define	HMBAE	((physadr) 0176350)
#define	HTBAE	((physadr) 0172474)
		if(dp) {
			dp->b_forw = dp;
			dp->b_back = dp;
			switch(nblkdev) {
			case 5:		/* ml - ML11 or hs - RS03/4 */
				if(fuiword((caddr_t)MLBAE) != -1)
					rh70ml++;
				if(fuiword((caddr_t)HSBAE) != -1)
					rh70hs++;
				break;
			case 6:		/* hp - RM02/3, RP04/5/6 */
				if(fuiword((caddr_t)HPBAE) != -1)
					rh70hp++;
				break;
			case 7:		/* ht - TU16/TE16 */
				if(fuiword((caddr_t)HTBAE) != -1)
					rh70ht++;
				break;
			case 12:	/* hm - RM02/3, RP04/5/6 */
				if(fuiword((caddr_t)HMBAE) != -1)
					rh70hm++;
				break;
			default:
				break;
			}
		}
		nblkdev++;
	}
}