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sdide: packet io byte count.

instead of setting the packet io byte count to some bullshit
value, use the dlen from the scsi request. limit transfer
byte count to 32k for atapi.

--- a/sys/src/9/pc/sdide.c

+++ b/sys/src/9/pc/sdide.c

@@ -1066,7 +1066,7 @@

 atapktio0(Drive *drive, SDreq *r)

 {

 	uchar *cmd;

-	int as, cmdport, ctlport, len, rv;

+	int as, cmdport, ctlport, rv;

 	Ctlr *ctlr;

 	rv = SDok;

@@ -1074,6 +1074,8 @@

 	drive->command = Cpkt;

 	memmove(drive->pktcmd, cmd, r->clen);

 	memset(drive->pktcmd+r->clen, 0, drive->pkt-r->clen);

+	if(drive->dlen > 0x8000)

+		drive->dlen = 0x8000;

 	drive->limit = drive->data+drive->dlen;

 	ctlr = drive->ctlr;

@@ -1086,21 +1088,15 @@

 		return SDnostatus;

 	ilock(ctlr);

-	if(drive->dlen && drive->dmactl && !atadmasetup(drive, drive->dlen)){

+	if(drive->dlen && drive->dmactl && !atadmasetup(drive, drive->dlen))

 		drive->pktdma = Dma;

-		len = 0;		/* bytecount should be 0 for dma */

-	}else{

+	else

 		drive->pktdma = 0;

-		if(drive->secsize)

-			len = 16*drive->secsize;

-		else

-			len = 0x8000;

-	}

 	outb(cmdport+Features, drive->pktdma);

 	outb(cmdport+Count, 0);

 	outb(cmdport+Sector, 0);

-	outb(cmdport+Bytelo, len);

-	outb(cmdport+Bytehi, len>>8);

+	outb(cmdport+Bytelo, drive->dlen);

+	outb(cmdport+Bytehi, drive->dlen>>8);

 	outb(cmdport+Dh, drive->dev);

 	ctlr->done = 0;

 	ctlr->curdrive = drive;

@@ -1374,10 +1370,8 @@

 	SDunit *unit;

 	unit = r->unit;

-	if((ctlr = unit->dev->ctlr) == nil || ctlr->drive[unit->subno] == nil){

-		r->status = SDtimeout;

-		return SDtimeout;

-	}

+	if((ctlr = unit->dev->ctlr) == nil || ctlr->drive[unit->subno] == nil)

+		return r->status = SDtimeout;

 	drive = ctlr->drive[unit->subno];

 	qlock(drive);

 	for(;;){

-- 

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