#include "u.h"#include "lib.h"#include "mem.h"#include "dat.h"#include "fns.h"#include "io.h" #include "ether.h" /* * Driver written for the 'Notebook Computer Ethernet LAN Adapter', * a plug-in to the bus-slot on the rear of the Gateway NOMAD 425DXL * laptop. The manual says NE2000 compatible. * The interface appears to be pretty well described in the National * Semiconductor Local Area Network Databook (1992) as one of the * AT evaluation cards. * * The NE2000 is really just a DP8390[12] plus a data port * and a reset port. */enum {	Data		= 0x10,		/* offset from I/O base of data port */	Reset		= 0x18,		/* offset from I/O base of reset port */}; intne2000reset(Ctlr *ctlr){	ushort buf[16];	int i; 	/*	 * Set up the software configuration.	 * Use defaults for port, irq, mem and size	 * if not specified.	 */	if(ctlr->card.port == 0)		ctlr->card.port = 0x300;	if(ctlr->card.irq == 0)		ctlr->card.irq = 2;	if(ctlr->card.mem == 0)		ctlr->card.mem = 0x4000;	if(ctlr->card.size == 0)		ctlr->card.size = 16*1024; 	ctlr->card.reset = ne2000reset;	ctlr->card.attach = dp8390attach;	ctlr->card.read = dp8390read;	ctlr->card.write = dp8390write;	ctlr->card.receive = dp8390receive;	ctlr->card.transmit = dp8390transmit;	ctlr->card.intr = dp8390intr;	ctlr->card.overflow = dp8390overflow; 	ctlr->card.bit16 = 1;	ctlr->card.dp8390 = ctlr->card.port;	ctlr->card.data = ctlr->card.port+Data; 	ctlr->card.tstart = HOWMANY(ctlr->card.mem, Dp8390BufSz);	ctlr->card.pstart = ctlr->card.tstart + HOWMANY(sizeof(Etherpkt), Dp8390BufSz);	ctlr->card.pstop = ctlr->card.tstart + HOWMANY(ctlr->card.size, Dp8390BufSz); 	/*	 * Reset the board. This is done by doing a read	 * followed by a write to the Reset address.	 */	buf[0] = inb(ctlr->card.port+Reset);	delay(2);	outb(ctlr->card.port+Reset, buf[0]);		/*	 * Init the (possible) chip, then use the (possible)	 * chip to read the (possible) PROM for ethernet address	 * and a marker byte.	 * We could just look at the DP8390 command register after	 * initialisation has been tried, but that wouldn't be	 * enough, there are other ethernet boards which could	 * match.	 */	dp8390reset(ctlr);	memset(buf, 0, sizeof(buf));	dp8390read(ctlr, buf, 0, sizeof(buf));	if((buf[0x0E] & 0xFF) != 0x57 || (buf[0x0F] & 0xFF) != 0x57)		return -1; 	/*	 * Stupid machine. We asked for shorts, we got shorts,	 * although the PROM is a byte array.	 * Now we can set the ethernet address.	 */	if((ctlr->card.ea[0]|ctlr->card.ea[1]|ctlr->card.ea[2]|ctlr->card.ea[3]|ctlr->card.ea[4]|ctlr->card.ea[5]) == 0){		for(i = 0; i < sizeof(ctlr->card.ea); i++)			ctlr->card.ea[i] = buf[i];	}	dp8390setea(ctlr); 	return 0;}