20060303

1 files changed, 110 insertions, 0 deletions

diff --git a/os/boot/pc/ether2000.c b/os/boot/pc/ether2000.c
new file mode 100644
index 00000000..4c329978
--- /dev/null
+++ b/os/boot/pc/ether2000.c
@@ -0,0 +1,110 @@
+#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 */
+};
+
+int
+ne2000reset(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;
+}