1991/0809/pc/devfloppy.c (diff list | history)

1991/0806/sys/src/9/pc/devfloppy.c:29,36 – 1991/0809/sys/src/9/pc/devfloppy.c:29,34 (short | long | prev | next)
1991/0727		Fwrite= 0x47, /* write cmd */ Fmulti= 0x80, /* or'd with Fread or Fwrite for multi-head */
1991/0731		Ndrive= 4, /* floppies/controller */
1991/0727
1991/0728		DMAchan= 2, /* floppy dma channel */
1991/0727		/* sector size encodings */
1991/0806/sys/src/9/pc/devfloppy.c:123,128 – 1991/0809/sys/src/9/pc/devfloppy.c:121,129
1991/0731		long len; /* size of xfer */
1991/0727
1991/0731		Rendez r; /* waiting here for motor to spin up */
1991/0809		uchar *ccache; /* cylinder cache (always read a whole cyl) */ int ccyl; /* number of cached cylinder */
1991/0727		}; /*
1991/0806/sys/src/9/pc/devfloppy.c:132,138 – 1991/0809/sys/src/9/pc/devfloppy.c:133,139
1991/0727		{
1991/0731		QLock; /* exclusive access to the contoller */ Drive d[Ndrive]; /* the floppy drives */
1991/0809		Drive *d; /* the floppy drives */
1991/0727		uchar stat[8]; /* status of an operation */ int confused;
1991/0731		int intr; /* true if interrupt occured */
1991/0806/sys/src/9/pc/devfloppy.c:173,178 – 1991/0809/sys/src/9/pc/devfloppy.c:174,180
1991/0802		}; #define NFDIR (sizeof(floppydir)/sizeof(Dirtab))
1991/0731
1991/0809		#define k64(x) (((ulong)(x))>>16)
1991/0731		void floppyreset(void) {
1991/0806/sys/src/9/pc/devfloppy.c:188,196 – 1991/0809/sys/src/9/pc/devfloppy.c:190,203
1991/0802		} /*
1991/0809		* allocate the drive storage */ floppy.d = ialloc(conf.nfloppy*sizeof(Drive), 0); /*
1991/0802		* stop the motors */
1991/0731		for(dp = floppy.d; dp < &floppy.d[Ndrive]; dp++){
1991/0809		for(dp = floppy.d; dp < &floppy.d[conf.nfloppy]; dp++){
1991/0731		dp->dev = dp - floppy.d; dp->t = &floppytype[0]; /* default type */
1991/0802		floppydir[2*dp->dev].length = dp->t->cap;
1991/0806/sys/src/9/pc/devfloppy.c:198,203 – 1991/0809/sys/src/9/pc/devfloppy.c:205,220
1991/0802		dp->cyl = -1; /* because we don't know */
1991/0731		motoroff(dp); }
1991/0809		/* * allocate cylinder caches that don't cross 64k boundaries */ for(dp = floppy.d; dp < &floppy.d[conf.nfloppy]; dp++){ do { dp->ccache = ialloc(dp->t->cap, 1); } while(k64(dp->ccache) != k64(dp->ccache+dp->t->cap)); dp->ccyl = -1; }
1991/0731		setvec(Floppyvec, floppyintr); }
1991/0806/sys/src/9/pc/devfloppy.c:272,282 – 1991/0809/sys/src/9/pc/devfloppy.c:289,304
1991/0802		a[3] = x; }
1991/0809		/* * the floppy is so slow, we always read a cylinder * at a time and cache the extra bytes. */
1991/0731		long floppyread(Chan *c, void *a, long n) { Drive *dp; long rv, i;
1991/0809		long rv, nn, len, cyl; int sec;
1991/0731		uchar *aa = a;
1991/0802		if(c->qid.path == CHDIR)
1991/0806/sys/src/9/pc/devfloppy.c:286,295 – 1991/0809/sys/src/9/pc/devfloppy.c:308,338
1991/0802		dp = &floppy.d[c->qid.path & ~Qmask]; switch ((int)(c->qid.path & Qmask)) { case Qdata: for(rv = 0; rv < n; rv += i){ i = floppyxfer(dp, Fread, aa+rv, c->offset+rv, n-rv); if(i <= 0) break;
1991/0809		if(c->offset % dp->t->bytes) errors("bad offset"); if(n % dp->t->bytes) errors("bad len"); nn = dp->t->bytes * dp->t->sectors * dp->t->heads; for(rv = 0; rv < n; rv += len){ /* * truncate xfer at cylinder boundary */ dp->len = n - rv; floppypos(dp, c->offset+rv); cyl = dp->tcyl; len = dp->len; sec = dp->tsec + dp->thead * dp->t->sectors; /* * read the cylinder */ if(dp->ccyl != cyl){ dp->ccyl = -1; if(floppyxfer(dp, Fread, dp->ccache, cyl * nn, nn) != nn) errors("floppy read err"); dp->ccyl = cyl; } memmove(aa+rv, dp->ccache + (sec-1)*dp->t->bytes, len);
1991/0802		} break; case Qstruct:
1991/0806/sys/src/9/pc/devfloppy.c:371,377 – 1991/0809/sys/src/9/pc/devfloppy.c:414,420
1991/0727
1991/0802		waserror(); for(;;){ for(dp = floppy.d; dp < &floppy.d[Ndrive]; dp++){
1991/0809		for(dp = floppy.d; dp < &floppy.d[conf.nfloppy]; dp++){
1991/0802		if(dp->motoron && TK2SEC(m->ticks - dp->lasttouched) > 5 && canqlock(dp)){ if(TK2SEC(m->ticks - dp->lasttouched) > 5)
1991/0806/sys/src/9/pc/devfloppy.c:382,389 – 1991/0809/sys/src/9/pc/devfloppy.c:425,430
1991/0803		disp++; if(owl(disp&1) < 0) print("owl failed\n"); if(mail((disp>>1)&1) < 0) print("mail failed\n");
1991/0802		tsleep(&floppy.kr, return0, 0, 5*1000);
1991/0803
1991/0727		}
1991/0806/sys/src/9/pc/devfloppy.c:592,598 – 1991/0809/sys/src/9/pc/devfloppy.c:633,639
1991/0727		delay(1); outb(Fmotor, Fintena|Fena); spllo();
1991/0731		for(dp = floppy.d; dp < &floppy.d[Ndrive]; dp++){
1991/0809		for(dp = floppy.d; dp < &floppy.d[conf.nfloppy]; dp++){
1991/0727		dp->motoron = 0; dp->confused = 1; }
1991/0806/sys/src/9/pc/devfloppy.c:603,609 – 1991/0809/sys/src/9/pc/devfloppy.c:644,650
1991/0727		/* * recalibrate any confused drives */
1991/0731		for(dp = floppy.d; floppy.confused == 0 && dp < &floppy.d[Ndrive]; dp++){
1991/0809		for(dp = floppy.d; floppy.confused == 0 && dp < &floppy.d[conf.nfloppy]; dp++){
1991/0727		if(dp->confused == 0) floppyrecal(dp);