From 2819a016fc486ebfc271ce0fd465254dcc13380b Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 15 Feb 1994 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1994-02-15

---
 carrera/screen.c |  2 ++
 pc/ether509.c    | 59 ++++++++++++++++++++++++++++++++++--------------
 port/devproc.c   |  2 +-
 port/qio.c       |  2 +-
 4 files changed, 46 insertions(+), 19 deletions(-)

diff --git a/carrera/screen.c b/carrera/screen.c
index 09f1def55c7806925a08e31b7cecf7ea964da443..b883f5454e8a2ad237556f18667fac5ca6755793 100644
--- a/carrera/screen.c
+++ b/carrera/screen.c
@@ -120,6 +120,8 @@ screenwin(void)
 	Dac *d;
 	ulong zbuf[16];
 
+	memset(Screenvirt, 0, 3*1024*1024);
+
 	gtexture(&gscreen, gscreen.r, &bgrnd, S);
 	w = defont0.info[' '].width;
 	h = defont0.height;
diff --git a/pc/ether509.c b/pc/ether509.c
index b8c370885904ada960942fd8e8202ce7319de34a..c02dbb2c70fe0b224b9287b0a039aded7222b1cb 100644
--- a/pc/ether509.c
+++ b/pc/ether509.c
@@ -10,8 +10,7 @@
 #include "etherif.h"
 
 enum {
-	IDport		= 0x0100,	/* anywhere between 0x0100 and 0x01F0 */
-
+	IDport		= 0x0110,	/* anywhere between 0x0100 and 0x01F0 */
 					/* Commands */
 	GlobalReset	= 0x00,		/* Global Reset */
 	SelectWindow	= 0x01,		/* SelectWindow command */
@@ -39,13 +38,13 @@ enum {
 	Command		= 0x0E,		/* all windows */
 	Status		= 0x0E,
 
-	EEPROMdata	= 0x0C,		/* window 0 */
-	EEPROMcmd	= 0x0A,
-	ResourceConfig	= 0x08,
-	AddressConfig	= 0x06,
-	ConfigControl	= 0x04,
+	ManufacturerID	= 0x00,		/* window 0 */
 	ProductID	= 0x02,
-	ManufacturerID	= 0x00,
+	ConfigControl	= 0x04,
+	AddressConfig	= 0x06,
+	ResourceConfig	= 0x08,
+	EEPROMcmd	= 0x0A,
+	EEPROMdata	= 0x0C,
 
 					/* AddressConfig Bits */
 	XcvrTypeMask	= 0xC000,	/* Transceiver Type Select */
@@ -53,6 +52,10 @@ enum {
 	XcvrAUI		= 0x4000,
 	XcvrBNC		= 0xC000,
 
+					/* ConfigControl */
+	Rst		= 0x04,		/* Reset Adapter */
+	Ena		= 0x01,		/* Enable Adapter */
+
 	TxFreeBytes	= 0x0C,		/* window 1 */
 	TxStatus	= 0x0B,
 	Timer		= 0x0A,
@@ -402,8 +405,7 @@ activate(void)
 	 *    The data comes back 1 bit at a time.
 	 *    We seem to need a delay here between reading the bits.
 	 *
-	 * If the ID doesn't match, the adapter
-	 * probably isn't there, so barf.
+	 * If the ID doesn't match, there are no more adapters.
 	 */
 	outb(IDport, 0x87);
 	for(x = 0, i = 0; i < 16; i++){
@@ -417,6 +419,7 @@ activate(void)
 	/*
 	 * 3. Read the Address Configuration from the EEPROM.
 	 *    The Address Configuration field is at offset 0x08 in the EEPROM).
+	 * 6. Tag the adapter so it won't respond in future.
 	 * 6. Activate the adapter by writing the Activate command
 	 *    (0xFF).
 	 */
@@ -426,6 +429,7 @@ activate(void)
 		acr <<= 1;
 		acr |= inb(IDport) & 0x01;
 	}
+	outb(IDport, 0xD1);
 	outb(IDport, 0xFF);
 
 	/*
@@ -435,7 +439,7 @@ activate(void)
 	 *    Enable the adapter. 
 	 */
 	port = (acr & 0x1F)*0x10 + 0x200;
-	outb(port+ConfigControl, 0x01);
+	outs(port+ConfigControl, Ena);
 
 	return port;
 }
@@ -443,18 +447,39 @@ activate(void)
 static ulong
 tcm509(Ether *ether)
 {
-	USED(ether);
-	return 0;
-
-#ifdef notdef
+	static int reset;
 	ulong port;
 	Adapter *ap;
 
+	/*
+	 * One time only:
+	 *	write ID sequence to get the attention of all adapters;
+	 *	global-reset all adapters;
+	 *	untag all adapters.
+	 */
+	if(reset == 0){
+		idseq();
+		outb(IDport, 0xC0);
+		delay(2);
+		outb(IDport, 0xD0);
+		reset = 1;
+	}
+
+	/*
+	 * Attempt to activate adapters until one matches our
+	 * address criteria.
+	 */
 	while(port = activate()){
+		if(ether->port == 0 || ether->port == port)
+			return port;
+
+		ap = malloc(sizeof(Adapter));
+		ap->port = port;
+		ap->next = adapter;
+		adapter = ap;
 	}
 
 	return 0;
-#endif /* notdef */
 }
 
 static ulong
@@ -472,7 +497,7 @@ tcm579(Ether *ether)
 			continue;
 		COMMAND(port+0xC80, GlobalReset, 0);
 		delay(1000);
-		outb(port+0xC80+ConfigControl, 0x01);
+		outs(port+0xC80+ConfigControl, Ena);
 		COMMAND(port+0xC80, SelectWindow, 0);
 		if(ether->port == 0 || ether->port == port)
 			return port;
diff --git a/port/devproc.c b/port/devproc.c
index 0c4ce2a08dca61947d2c2ade93993f33e0755dfe..38114e89acc2dbe7665f845410bb1c1c663e8681 100644
--- a/port/devproc.c
+++ b/port/devproc.c
@@ -34,7 +34,7 @@ Dirtab procdir[] =
 	"counters",	{Qcounters},	0,			0444,
 	"ctl",		{Qctl},		0,			0000,
 	"fpregs",	{Qfpregs},	sizeof(FPsave),		0000,
-	"kregs",	{Qkregs},	sizeof(Ureg),		0000,
+	"kregs",	{Qkregs},	sizeof(Ureg),		0400,
 	"mem",		{Qmem},		0,			0000,
 	"note",		{Qnote},	0,			0000,
 	"noteid",	{Qnoteid},	0,			0666,
diff --git a/port/qio.c b/port/qio.c
index 20e468cd6ec9d0c6b93e3e457a2161c9a5102b8e..e2e10a0ba987c112eab67ff19f0e418aa3620f5c 100644
--- a/port/qio.c
+++ b/port/qio.c
@@ -591,7 +591,7 @@ qnotfull(void *a)
 {
 	Queue *q = a;
 
-	return q->len < q->limit;
+	return q->len < q->limit || (q->state & Qclosed);
 }
 
 /*