From 5f040733c35c1597a135df3d5882e80df846aa9a Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 15 Apr 1997 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1997-04-15

---
 pc/devether.c   | 22 +++++++++++++++++++
 pc/ether8390.c  | 56 +++++++++++++++++++++++++++++++++++++++++++++++++
 pc/ether8390.h  |  2 ++
 pc/etherelnk3.c |  4 +++-
 pc/etherif.h    |  1 +
 pc/fns.h        |  3 +--
 port/portfns.h  |  1 -
 7 files changed, 85 insertions(+), 4 deletions(-)

diff --git a/pc/devether.c b/pc/devether.c
index cc1c555e96c38e9ee44c0c7aea5683e6cf775a7d..138c937b7799385539465e2c696d6dc830c1f3ad 100644
--- a/pc/devether.c
+++ b/pc/devether.c
@@ -385,6 +385,28 @@ etherreset(void)
 		free(ether);
 }
 
+#define POLY 0xedb88320
+
+/* really slow 32 bit crc for ethers */
+ulong
+ethercrc(uchar *p, int len)
+{
+	int i, j;
+	ulong crc, b;
+
+	crc = 0xffffffff;
+	for(i = 0; i < len; i++){
+		b = *p++;
+		for(j = 0; j < 8; j++){
+			crc = (crc>>1);
+			if((crc^b) & 1)
+				crc ^= POLY;
+			b >>= 1;
+		}
+	}
+	return crc;
+}
+
 Dev etherdevtab = {
 	'l',
 	"ether",
diff --git a/pc/ether8390.c b/pc/ether8390.c
index ac88802c71e9b62b36f2fcb1b0fe547101d15265..1eb53a5536633f500d0e4385ec02b8406adee789 100644
--- a/pc/ether8390.c
+++ b/pc/ether8390.c
@@ -620,6 +620,59 @@ promiscuous(void *arg, int on)
 	r = Ab;
 	if(on)
 		r |= Pro;
+	if(ether->nmaddr)
+		r |= Am;
+	ilock(ctlr);
+	regw(ctlr, Rcr, r);
+	iunlock(ctlr);
+}
+
+static void
+multicast(void* arg, uchar *addr, int on)
+{
+	Ether *ether;
+	Dp8390 *ctlr;
+	uchar r, cr;
+	int i;
+	ulong h;
+
+	USED(addr, on);
+
+	ether = arg;
+	ctlr = ether->ctlr;
+
+	/*
+	 *  change filter bits
+	 */
+	h = ethercrc(addr, 6);
+	h = h>>(32-6);
+	i = h/8;
+	h = h%8;
+	ilock(ctlr);
+	cr = regr(ctlr, Cr) & ~Txp;
+	regw(ctlr, Cr, Page1|(~(Ps1|Ps0) & cr));
+	r = regr(ctlr, Mar0+i);
+	if(on){
+		if(++(ctlr->mref[h]) == 1)
+			r |= 1<<h;
+	} else {
+		if(--(ctlr->mref[h]) <= 0){
+			ctlr->mref[h] = 0;
+			r &= ~(1<<h);
+		}
+	}	
+	regw(ctlr, Mar0+i, r);
+	regw(ctlr, Cr, cr);
+	iunlock(ctlr);
+
+	/*
+	 * Set/reset promiscuous mode.
+	 */
+	r = Ab;
+	if(ether->nmaddr)
+		r |= Am;
+	if(ether->prom)
+		r |= Pro;
 	ilock(ctlr);
 	regw(ctlr, Rcr, r);
 	iunlock(ctlr);
@@ -642,6 +695,8 @@ attach(Ether* ether)
 	r = Ab;
 	if(ether->prom)
 		r |= Pro;
+	if(ether->nmaddr)
+		r |= Am;
 	ilock(ctlr);
 	regw(ctlr, Rcr, r);
 	r = regr(ctlr, Cntr2);
@@ -719,6 +774,7 @@ dp8390reset(Ether* ether)
 	ether->ifstat = 0;
 
 	ether->promiscuous = promiscuous;
+	ether->multicast = multicast;
 	ether->arg = ether;
 
 	return 0;
diff --git a/pc/ether8390.h b/pc/ether8390.h
index 1c464110988693b0ffb7c8142373b1ae1c105361..8fff39432a14275a36fff9be9eb061b0042e4cd6 100644
--- a/pc/ether8390.h
+++ b/pc/ether8390.h
@@ -19,6 +19,8 @@ typedef struct {
 
 	int	txbusy;			/* transmit */
 	uchar	tstart;			/* 8390 ring addresses */
+
+	int	mref[64];		/* reference counts for multicast groups */
 } Dp8390;
 
 #define Dp8390BufSz	256
diff --git a/pc/etherelnk3.c b/pc/etherelnk3.c
index 7459de517746e7710efc882dec5e78442b48725a..a87f486aa11020d685d915554c5b09e56f32308b 100644
--- a/pc/etherelnk3.c
+++ b/pc/etherelnk3.c
@@ -467,10 +467,12 @@ multicast(void* arg, uchar *addr, int on)
 	ether = (Ether*)arg;
 	port = ether->port;
 
-print("mutlicast nmaddr == %d\n", ether->nmaddr);
+print("multicast nmaddr == %d\n", ether->nmaddr);
 	filter = receiveBroadcast|receiveIndividual;
 	if(ether->nmaddr)
 		filter |= receiveMulticast;
+	if(ether->prom)
+		filter |= receiveAllFrames;
 	COMMAND(port, SetRxFilter, filter);
 }
 
diff --git a/pc/etherif.h b/pc/etherif.h
index 97f65bdfa7cb8fd57eba411f834b075ce94b4652..cc82e05e5f8dd731866e208b63d8bb11970d1404 100644
--- a/pc/etherif.h
+++ b/pc/etherif.h
@@ -24,6 +24,7 @@ struct Ether {
 
 extern Block* etheriq(Ether*, Block*, int);
 extern void addethercard(char*, int(*)(Ether*));
+extern ulong ethercrc(uchar*, int);
 
 #define NEXT(x, l)	(((x)+1)%(l))
 #define PREV(x, l)	(((x) == 0) ? (l)-1: (x)-1)
diff --git a/pc/fns.h b/pc/fns.h
index 2e747514ac0e4358b1e7b3aab550a663123b0faa..766c28d7cedadd78bd81f9704eb47294c2895b54 100644
--- a/pc/fns.h
+++ b/pc/fns.h
@@ -48,11 +48,10 @@ void	insl(int, void*, int);
 void	intrenable(int, void (*)(Ureg*, void*), void*, int);
 int	iprint(char*, ...);
 int	isaconfig(char*, int, ISAConf*);
-ulong	getisa(ulong, int, int);
-void	putisa(ulong, int);
 void	kbdinit(void);
 void	lgdt(ushort[3]);
 void	lidt(ushort[3]);
+void	links(void);
 void	ltr(ulong);
 void	mathinit(void);
 #define mmuflushtlb(pdb) putcr3(pdb)
diff --git a/port/portfns.h b/port/portfns.h
index 50d7bdbe7ae6ca894744e493fd38e53b029b53ca..33d5a596b83051e7a6fe5217861f18b646422754 100644
--- a/port/portfns.h
+++ b/port/portfns.h
@@ -135,7 +135,6 @@ void		kprocchild(Proc*, void (*)(void*), void*);
 void		(*kproftimer)(ulong);
 void		ksetenv(char*, char*);
 long		latin1(uchar*, int);
-void		links(void);
 void		lock(Lock*);
 void		lockinit(void);
 Page*		lookpage(Image*, ulong);