?? rf.c
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#/* * RF 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"struct device { int rfcs; int rfwc; char *rfba; int rfda; int rfdae;};struct buf rftab;struct buf rrfbuf;#define NRFBLK 1024#define RFADDR ((struct device *)0177460)#define GO 01#define RCOM 04#define WCOM 02#define CTLCLR 0400#define IENABLE 0100/* * Monitoring device number */#define DK_N 0rfstrategy(bp)register struct buf *bp;{ if(bp->b_flags&B_PHYS) mapalloc(bp); if (bp->b_blkno >= NRFBLK*(minor(bp->b_dev)+1)) { bp->b_flags |= B_ERROR; iodone(bp); return; } bp->av_forw = 0; spl5(); if (rftab.b_actf == NULL) rftab.b_actf = bp; else rftab.b_actl->av_forw = bp; rftab.b_actl = bp; if (rftab.b_active == NULL) rfstart(); spl0();}rfstart(){ register struct buf *bp; register int com; if ((bp = rftab.b_actf) == NULL) return; rftab.b_active++; RFADDR->rfda = (int)(bp->b_blkno<<8)&0177777; RFADDR->rfdae = (int)(bp->b_blkno>>8)&037; RFADDR->rfba = bp->b_un.b_addr; RFADDR->rfwc = -(bp->b_bcount>>1); com = (bp->b_xmem&3) << 4; com |= (bp->b_flags & B_READ) ? RCOM+GO+IENABLE : WCOM+GO+IENABLE; RFADDR->rfcs = com; dk_busy |= 1<<DK_N; dk_numb[DK_N] += 1; com = (-bp->b_bcount>>5) & 03777; dk_wds[DK_N] += com;}rfintr(){ register struct buf *bp; if (rftab.b_active == NULL) return; dk_busy &= ~(1<<DK_N); bp = rftab.b_actf; rftab.b_active = NULL; if (RFADDR->rfcs < 0) { /* error bit */ deverror(bp, RFADDR->rfcs, RFADDR->rfdae); RFADDR->rfcs = CTLCLR; if (++rftab.b_errcnt <= 10) { rfstart(); return; } bp->b_flags |= B_ERROR; } rftab.b_errcnt = 0; rftab.b_actf = bp->av_forw; bp->b_resid = 0; iodone(bp); rfstart();}rfread(dev){ physio(rfstrategy, &rrfbuf, dev, B_READ);}rfwrite(dev){ physio(rfstrategy, &rrfbuf, dev, B_WRITE);}?? 快捷鍵說明
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