/* * RK disk driver */#include "../h/param.h"#include "../h/systm.h"#include "../h/buf.h"#include "../h/conf.h"#include	"../h/dir.h"#include "../h/user.h"#define	RKADDR	((struct device *)0177400)#define	NRK	4#define	NRKBLK	4872#define	RESET	0#define	WCOM	2#define	RCOM	4#define	GO	01#define	DRESET	014#define	IENABLE	0100#define	DRY	0200#define	ARDY	0100#define	WLO	020000#define	CTLRDY	0200/* * Monitoring device bit */#define	DK_N	1struct	device{	int	rkds;	int	rker;	int	rkcs;	int	rkwc;	caddr_t	rkba;	int	rkda;};struct	buf	rktab;struct	buf	rrkbuf;rkstrategy(bp)register struct buf *bp;{	if(bp->b_flags&B_PHYS)		mapalloc(bp);	if (bp->b_blkno >= NRKBLK) {		bp->b_flags |= B_ERROR;		iodone(bp);		return;	}	bp->av_forw = (struct buf *)NULL;	spl5();	if(rktab.b_actf == NULL)		rktab.b_actf = bp;	else		rktab.b_actl->av_forw = bp;	rktab.b_actl = bp;	if(rktab.b_active == NULL)		rkstart();	spl0();}rkstart(){	register struct buf *bp;	register com;	daddr_t bn;	int dn, cn, sn;	if ((bp = rktab.b_actf) == NULL)		return;	rktab.b_active++;	bn = bp->b_blkno;	dn = minor(bp->b_dev);	cn = bn/12;	sn = bn%12;	RKADDR->rkda = (dn<<13) | (cn<<4) | sn;	RKADDR->rkba = bp->b_un.b_addr;	RKADDR->rkwc = -(bp->b_bcount>>1);	com = ((bp->b_xmem&3) << 4) | IENABLE | GO;	if(bp->b_flags & B_READ)		com |= RCOM; else		com |= WCOM;	RKADDR->rkcs = com;	dk_busy |= 1<<DK_N;	dk_numb[DK_N] += 1;	com = bp->b_bcount>>6;	dk_wds[DK_N] += com;}rkintr(){	register struct buf *bp;	if (rktab.b_active == NULL)		return;	dk_busy &= ~(1<<DK_N);	bp = rktab.b_actf;	rktab.b_active = NULL;	if (RKADDR->rkcs < 0) {		/* error bit */		deverror(bp, RKADDR->rker, RKADDR->rkds);		RKADDR->rkcs = RESET|GO;		while((RKADDR->rkcs&CTLRDY) == 0)			;		if (++rktab.b_errcnt <= 10) {			rkstart();			return;		}		bp->b_flags |= B_ERROR;	}	rktab.b_errcnt = 0;	rktab.b_actf = bp->av_forw;	bp->b_resid = 0;	iodone(bp);	rkstart();}rkread(dev)dev_t dev;{	physio(rkstrategy, &rrkbuf, dev, B_READ);}rkwrite(dev)dev_t dev;{	physio(rkstrategy, &rrkbuf, dev, B_WRITE);}