From ffc0cc9a3bacacd2a606ab37f521703eda271a76 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 14 Apr 1992 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1992-04-14

---
 pc/vga.c        | 35 +++++++++++++++++++++++++++++++++++
 port/devip.c    | 14 +++++++-------
 port/ipdat.h    |  2 +-
 port/stil.c     |  2 +-
 port/tcpinput.c |  2 +-
 5 files changed, 45 insertions(+), 10 deletions(-)

diff --git a/pc/vga.c b/pc/vga.c
index d3a8f204e08614f342c33be762b24401dc0a55d1..858111302b1c355f6cef56017c1b775b5e2f71e2 100644
--- a/pc/vga.c
+++ b/pc/vga.c
@@ -66,6 +66,7 @@ struct VGAmode
 	uchar	attribute[0x15];
 };
 
+#ifdef ORIGINALSAFARI
 /*
  *  640x480 display, 16 bit color
  */
@@ -88,10 +89,35 @@ VGAmode mode12 =
 	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
 	0x01, 0x00, 0x0f, 0x00, 0x00,
 };
+#else
+/*
+ *  640x480 display, 16 bit color - attempt at SVGA version...ches
+ */
+VGAmode mode12 = 
+{
+	/* general */
+	0xe7, 0x00, 0x70, 0x04,
+	/* sequence */
+	0x03, 0x01, 0x0f, 0x00, 0x06,
+	/* crt */
+	0x65, 0x4f, 0x50, 0x88, 0x55, 0x9a, 0x09, 0x3e,
+	0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0xe8, 0x8b, 0xdf, 0x28, 0x00, 0xe7, 0x04, 0xe3,
+	0xff,
+	/* graphics */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x0f,
+	0xff,
+	/* attribute */
+	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07,
+	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
+	0x01, 0x00, 0x0f, 0x00, 0x00,
+};
+#endif
 
 void
 genout(int reg, int val)
 {
+delay(1000);
 	if(reg == 0)
 		outb(EMISCW, val);
 	else if (reg == 1)
@@ -100,6 +126,10 @@ genout(int reg, int val)
 void
 srout(int reg, int val)
 {
+	/*
+	 * needed or the screen goes blank on an ultra VGA card
+	 */
+	delay(1000);
 	outb(SRX, reg);
 	outb(SR, val);
 }
@@ -112,6 +142,10 @@ grout(int reg, int val)
 void
 arout(int reg, int val)
 {
+	/*
+	 * if this print is missing, we are left with a blank white screen.
+	 */
+	print("arout %d %2x\n", reg, val);
 	inb(0x3DA);
 	outb(ARW, reg | 0x20);
 	outb(ARW, val);
@@ -119,6 +153,7 @@ arout(int reg, int val)
 void
 crout(int reg, int val)
 {
+	delay(1000);	/* needed for 16bit VGA path on Ultra SVGA */
 	outb(CRX, reg);
 	outb(CR, val);
 }
diff --git a/port/devip.c b/port/devip.c
index d6f10ddc6dbbef8c3fa25213221478bd58ffd8e9..9e21cbe2a3523dccf8c2fa878095d10d27f32e8e 100644
--- a/port/devip.c
+++ b/port/devip.c
@@ -654,18 +654,17 @@ iplisten(Chan *c)
 	if(s->ilctl.state != Illistening)
 		error(Enolisten);
 
-	qlock(&s->listenq);
-	if(waserror()) {
-		qunlock(&s->listenq);
-		nexterror();
-	}
-
 	for(;;) {
+		qlock(&s->listenq);	/* single thread for the sleep */
+		if(waserror()) {
+			qunlock(&s->listenq);
+			nexterror();
+		}
 		sleep(&s->listenr, iphavecon, s);
 		poperror();
 		new = base;
  		for(etab = &base[conf.ip]; new < etab; new++) {
-			if(new->newcon) {
+			if(new->newcon == s) {
 				qlock(s);
 				s->curlog--;
 				qunlock(s);
@@ -674,6 +673,7 @@ iplisten(Chan *c)
 				return new - base;
 			}
 		}
+		qunlock(&s->listenq);
 		print("iplisten: no newcon\n");
 	}
 }
diff --git a/port/ipdat.h b/port/ipdat.h
index 9d9c99a0d2ef831f238528ab9a66238f7de61f6d..3e138b1677275d6b79617eb45e78b3ef45fc4ddb 100644
--- a/port/ipdat.h
+++ b/port/ipdat.h
@@ -294,7 +294,7 @@ struct Ipconv
 	char	*err;			/* Async protocol error */
 	int	backlog;		/* Maximum number of waiting connections */
 	int	curlog;			/* Number of waiting connections */
-	int 	newcon;			/* Flags that this is the start of a connection */
+	Ipconv 	*newcon;		/* Flags that this is the start of a connection */
 
 	union {
 		Tcpctl	tcpctl;			/* Tcp control block */
diff --git a/port/stil.c b/port/stil.c
index e802a25ba01426b827ee049b59227130ffc021f5..9b91640e7aefb36b1c1bbf03b80bc02204081dc2 100644
--- a/port/stil.c
+++ b/port/stil.c
@@ -294,7 +294,7 @@ ilrcvmsg(Ipconv *ipc, Block *bp)
 			if(new == 0)
 				goto reset;
 
-			new->newcon = 1;
+			new->newcon = s;
 			new->ipinterface = s->ipinterface;
 			new->psrc = sp;
 			new->pdst = dp;
diff --git a/port/tcpinput.c b/port/tcpinput.c
index cb512a6fbadee78a5137e3e6302ca52746fa7266..d0e9770522b5df19053af5cc21880dc0895f0db1 100644
--- a/port/tcpinput.c
+++ b/port/tcpinput.c
@@ -103,7 +103,7 @@ tcpincoming(Ipconv *ipc, Ipconv *s, Tcp *segp, Ipaddr source)
 	new->tcpctl.timer.state = TIMER_STOP;
 	new->tcpctl.acktimer.arg = new;
 	new->tcpctl.acktimer.state = TIMER_STOP;
-	new->newcon = 1;
+	new->newcon = s;
 	new->ipinterface = s->ipinterface;
 
 	s->ipinterface->ref++;