104 lines
1.4 KiB
C
104 lines
1.4 KiB
C
#
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/*
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*/
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/*
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* RF disk driver
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*/
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#include "../param.h"
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#include "../buf.h"
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#include "../conf.h"
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#include "../user.h"
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struct {
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int rfcs;
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int rfwc;
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int rfba;
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int rfda;
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int rfdae;
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};
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struct devtab rftab;
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struct buf rrfbuf;
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#define NRFBLK 1024
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#define RFADDR 0177460
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#define GO 01
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#define RCOM 02
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#define WCOM 04
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#define CTLCLR 0400
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#define IENABLE 0100
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rfstrategy(abp)
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struct buf *abp;
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{
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register struct buf *bp;
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bp = abp;
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if(bp->b_flags&B_PHYS)
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mapalloc(bp);
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if (bp->b_blkno >= NRFBLK*(bp->b_dev.d_minor+1)) {
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bp->b_flags =| B_ERROR;
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iodone(bp);
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return;
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}
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bp->av_forw = 0;
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spl5();
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if (rftab.d_actf==0)
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rftab.d_actf = bp;
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else
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rftab.d_actl->av_forw = bp;
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rftab.d_actl = bp;
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if (rftab.d_active==0)
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rfstart();
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spl0();
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}
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rfstart()
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{
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register struct buf *bp;
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if ((bp = rftab.d_actf) == 0)
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return;
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rftab.d_active++;
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RFADDR->rfdae = bp->b_blkno.hibyte;
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devstart(bp, &RFADDR->rfda, bp->b_blkno<<8, 0);
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}
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rfintr()
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{
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register struct buf *bp;
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if (rftab.d_active == 0)
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return;
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bp = rftab.d_actf;
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rftab.d_active = 0;
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if (RFADDR->rfcs < 0) { /* error bit */
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deverror(bp, RFADDR->rfcs, RFADDR->rfdae);
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RFADDR->rfcs = CTLCLR;
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if (++rftab.d_errcnt <= 10) {
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rfstart();
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return;
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}
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bp->b_flags =| B_ERROR;
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}
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rftab.d_errcnt = 0;
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rftab.d_actf = bp->av_forw;
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iodone(bp);
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rfstart();
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}
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rfread(dev)
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{
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physio(rfstrategy, &rrfbuf, dev, B_READ);
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}
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rfwrite(dev)
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{
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physio(rfstrategy, &rrfbuf, dev, B_WRITE);
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}
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