ether8390.h

著名操作系统Plan 9的第三版的部分核心源代码。现在很难找到了。Plan 9是bell实验室开发的Unix后继者。

/*
 * Ctlr for the boards using the National Semiconductor DP8390
 * and SMC 83C90 Network Interface Controller.
 * Common code is in ether8390.c.
 */
typedef struct {
	Lock;

	ulong	port;			/* I/O address of 8390 */
	ulong	data;			/* I/O data port if no shared memory */

	uchar	width;			/* data transfer width in bytes */
	uchar	ram;			/* true if card has shared memory */
	uchar	dummyrr;		/* do dummy remote read */

	uchar	nxtpkt;			/* receive: software bndry */
	uchar	pstart;
	uchar	pstop;

	int	txbusy;			/* transmit */
	uchar	tstart;			/* 8390 ring addresses */
} Dp8390;

#define Dp8390BufSz	256

extern int dp8390reset(Ether*);
extern void *dp8390read(Dp8390*, void*, ulong, ulong);
extern void dp8390getea(Ether*, uchar*);
extern void dp8390setea(Ether*);

/*
 * x86-specific code.
 */
#define regr(c, r)	inb((c)->port+(r))
#define regw(c, r, v)	outb((c)->port+(r), (v))

static void
rdread(Dp8390* ctlr, void* to, int len)
{
	switch(ctlr->width){
	default:
		panic("dp8390 rdread: width %d\n", ctlr->width);
		break;

	case 2:
		inss(ctlr->data, to, len/2);
		break;

	case 1:
		insb(ctlr->data, to, len);
		break;
	}
}

static void
rdwrite(Dp8390* ctlr, void* from, int len)
{
	switch(ctlr->width){
	default:
		panic("dp8390 rdwrite: width %d\n", ctlr->width);
		break;

	case 2:
		outss(ctlr->data, from, len/2);
		break;

	case 1:
		outsb(ctlr->data, from, len);
		break;
	}
}