#include "u.h"#include "lib.h"#include "mem.h"#include "dat.h"#include "fns.h"#include "io.h" #include "etherif.h"#include "ether8390.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		= 0x1F,		/* offset from I/O base of reset port */}; intne2000reset(Ether* ether){	ushort buf[16];	ulong port;	Dp8390 *ctlr;	int i;	uchar ea[Eaddrlen]; 	/*	 * Set up the software configuration.	 * Use defaults for port, irq, mem and size	 * if not specified.	 */	if(ether->port == 0)		ether->port = 0x300;	if(ether->irq == 0)		ether->irq = 2;	if(ether->mem == 0)		ether->mem = 0x4000;	if(ether->size == 0)		ether->size = 16*1024;	port = ether->port; 	ether->ctlr = malloc(sizeof(Dp8390));	ctlr = ether->ctlr;	ctlr->width = 2;	ctlr->ram = 0; 	ctlr->port = port;	ctlr->data = port+Data; 	ctlr->tstart = HOWMANY(ether->mem, Dp8390BufSz);	ctlr->pstart = ctlr->tstart + HOWMANY(sizeof(Etherpkt), Dp8390BufSz);	ctlr->pstop = ctlr->tstart + HOWMANY(ether->size, Dp8390BufSz); 	ctlr->dummyrr = 1;	for(i = 0; i < ether->nopt; i++){		if(strcmp(ether->opt[i], "nodummyrr"))			continue;		ctlr->dummyrr = 0;		break;	} 	/*	 * Reset the board. This is done by doing a read	 * followed by a write to the Reset address.	 */	buf[0] = inb(port+Reset);	delay(2);	outb(port+Reset, buf[0]);	delay(2);		/*	 * Init the (possible) chip, then use the (possible)	 * chip to read the (possible) PROM for ethernet address	 * and a marker byte.	 * 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(ether);	memset(buf, 0, sizeof(buf));	dp8390read(ctlr, buf, 0, sizeof(buf));	if((buf[0x0E] & 0xFF) != 0x57 || (buf[0x0F] & 0xFF) != 0x57){		free(ether->ctlr);		return -1;	} 	/*	 * Stupid machine. Shorts were asked for,	 * shorts were delivered, although the PROM is a byte array.	 * Set the ethernet address.	 */	memset(ea, 0, Eaddrlen);	if(memcmp(ea, ether->ea, Eaddrlen) == 0){		for(i = 0; i < sizeof(ether->ea); i++)			ether->ea[i] = buf[i];	}	dp8390setea(ether); 	return 0;}