From a12614456ed8cb841daee7ce7536a127ca341304 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Wed, 4 Nov 1992 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1992-11-04

---
 gnot/screen.c  |  6 ----
 gnot/screen.h  |  5 +++
 pc/devhard.c   |  2 +-
 pc/screen.h    |  5 +++
 pc/vga.c       |  6 ----
 port/devbit.c  | 92 +++++++++++++-------------------------------------
 port/devproc.c | 17 +++++++++-
 port/devscc.c  |  2 +-
 port/portfns.h |  8 +++--
 port/segment.c |  9 +++--
 port/sysproc.c |  4 +--
 ss/screen.c    |  6 ----
 ss/screen.h    |  5 +++
 13 files changed, 71 insertions(+), 96 deletions(-)

diff --git a/gnot/screen.c b/gnot/screen.c
index b045ec0886689671171b3ffaf37ecb245b557585..d37307b53af2da2c64e149f72d2eb165690eaa45 100644
--- a/gnot/screen.c
+++ b/gnot/screen.c
@@ -184,9 +184,3 @@ mousectl(char *x)
 {
 	USED(x);
 }
-
-void
-screenupdate(Rectangle r)
-{
-	USED(r);
-}
diff --git a/gnot/screen.h b/gnot/screen.h
index a3dd699a525856e050fc5a74688ba926b93df537..04fd048b804c96347861a49ecae322422183ad7f 100644
--- a/gnot/screen.h
+++ b/gnot/screen.h
@@ -29,3 +29,8 @@ extern Cursorinfo	cursor;
 extern void		mouseupdate(int);
 
 #define	hwscreenwrite(a, b)
+
+#define mbbpt(x)
+#define mbbrect(x)
+#define screenupdate()
+#define mousescreenupdate()
diff --git a/pc/devhard.c b/pc/devhard.c
index ede02e079a5fcba25e9e6cc769cc8f333561783d..268c92ae645b8ea7950987d4c42ef1aa4d79acad 100644
--- a/pc/devhard.c
+++ b/pc/devhard.c
@@ -982,7 +982,7 @@ hardintr(Ureg *ur)
 		cp->cmd = 0;
 		break;
 	default:
-		print("weird disk interrupt, cmd=%02x, status=%02x\n",
+		print("weird disk interrupt, cmd=%.2ux, status=%.2ux\n",
 			cp->cmd, cp->status);
 		break;
 	}
diff --git a/pc/screen.h b/pc/screen.h
index a3dd699a525856e050fc5a74688ba926b93df537..04fd048b804c96347861a49ecae322422183ad7f 100644
--- a/pc/screen.h
+++ b/pc/screen.h
@@ -29,3 +29,8 @@ extern Cursorinfo	cursor;
 extern void		mouseupdate(int);
 
 #define	hwscreenwrite(a, b)
+
+#define mbbpt(x)
+#define mbbrect(x)
+#define screenupdate()
+#define mousescreenupdate()
diff --git a/pc/vga.c b/pc/vga.c
index f875741302b1ad39ab7f6b5f994b808ef6d12c04..00a51b2e74d3d223db1052c610faf3db45798f33 100644
--- a/pc/vga.c
+++ b/pc/vga.c
@@ -381,9 +381,3 @@ bigcursor(void)
 
 	memmove(&arrow, &fatarrow, sizeof(fatarrow));
 }
-
-void
-screenupdate(Rectangle r)
-{
-	USED(r);
-}
diff --git a/port/devbit.c b/port/devbit.c
index cb80f0ee12003bdaaa6422344023640dbf850dca..9b85297f400c6e3bee9613096def4aba488cc979 100644
--- a/port/devbit.c
+++ b/port/devbit.c
@@ -106,10 +106,8 @@ extern	GBitmap	gscreen;
 
 Mouseinfo	mouse;
 Cursorinfo	cursor;
-Rendez		lcdmouse;
 int		mouseshifted;
 int		mousetype;
-int		islcd;
 
 Cursor	arrow =
 {
@@ -164,8 +162,6 @@ void	cursoron(int);
 void	cursoroff(int);
 int	mousechanged(void*);
 
-static Rectangle mbb = {10000, 10000, -10000, -10000};
-
 enum{
 	Qdir,
 	Qbitblt,
@@ -185,6 +181,19 @@ Dirtab bitdir[]={
 #define	NINFO	8192	/* max chars per subfont; sanity check only */
 #define	HDR	3
 
+void
+lockedupdate(void)
+{
+	qlock(&bit);
+	if(waserror()){
+		qunlock(&bit);
+		return;
+	}
+	screenupdate();
+	qunlock(&bit);
+	poperror();
+}
+
 void
 bitfreeup(void)
 {
@@ -252,27 +261,6 @@ bitdebug(void)
 	print("%d subfonts\n", l);
 }
 
-/*
- * need a process to do scsi transactions to update mouse on LCD
- */
-void
-lcdmousep(void *a)
-{
-	USED(a);
-	for(;;){
-		sleep(&lcdmouse, return0, 0);
-		qlock(&bit);
-		if(waserror()){
-			qunlock(&bit);
-			continue;
-		}
-		screenupdate(mbb);
-		mbb = Rect(10000, 10000, -10000, -10000);
-		qunlock(&bit);
-		poperror();
-	}
-}
-
 void
 bitreset(void)
 {
@@ -332,8 +320,6 @@ bitinit(void)
 		cursorback.width = ((16 << gscreen.ldepth) + 31) >> 5;
 	}
 	cursoron(1);
-	if(islcd)
-		kproc("lcdmouse", lcdmousep, 0);
 }
 
 Chan*
@@ -777,32 +763,6 @@ bitread(Chan *c, void *va, long n, ulong offset)
 	return n;
 }
 
-static void
-mbbrect(Rectangle r)
-{
-	if (r.min.x < mbb.min.x)
-		mbb.min.x = r.min.x;
-	if (r.min.y < mbb.min.y)
-		mbb.min.y = r.min.y;
-	if (r.max.x > mbb.max.x)
-		mbb.max.x = r.max.x;
-	if (r.max.y > mbb.max.y)
-		mbb.max.y = r.max.y;
-}
-
-static void
-mbbpt(Point p)
-{
-	if (p.x < mbb.min.x)
-		mbb.min.x = p.x;
-	if (p.y < mbb.min.y)
-		mbb.min.y = p.y;
-	if (p.x >= mbb.max.x)
-		mbb.max.x = p.x+1;
-	if (p.y >= mbb.max.y)
-		mbb.max.y = p.y+1;
-}
-
 Point
 bitstrsize(GFont *f, uchar *p, int l)
 {
@@ -945,7 +905,7 @@ bitwrite(Chan *c, void *va, long n, ulong offset)
 				isoff = 1;
 			}
 			gbitblt(dst, pt, src, rect, fc);
-			if(islcd && dst->base < endscreen)
+			if(dst->base < endscreen)
 				mbbrect(Rpt(pt, add(pt, sub(rect.max, rect.min))));
 			m -= 31;
 			p += 31;
@@ -1180,7 +1140,7 @@ bitwrite(Chan *c, void *va, long n, ulong offset)
 				isoff = 1;
 			}
 			gsegment(dst, pt1, pt2, t, fc);
-			if(islcd && dst->base < endscreen) {
+			if(dst->base < endscreen) {
 				mbbpt(pt1);
 				mbbpt(pt2);
 			}
@@ -1283,7 +1243,7 @@ bitwrite(Chan *c, void *va, long n, ulong offset)
 				isoff = 1;
 			}
 			gpoint(dst, pt1, t, fc);
-			if(islcd && dst->base < endscreen)
+			if(dst->base < endscreen)
 				mbbpt(pt1);
 			m -= 14;
 			p += 14;
@@ -1375,7 +1335,7 @@ bitwrite(Chan *c, void *va, long n, ulong offset)
 				isoff = 1;
 			}
 			bitstring(dst, pt, ff, p, l, fc);
-			if(islcd && dst->base < endscreen)
+			if(dst->base < endscreen)
 				mbbrect(Rpt(pt, add(pt, bitstrsize(ff, p, l))));
 			m -= l;
 			p += l;
@@ -1414,7 +1374,7 @@ bitwrite(Chan *c, void *va, long n, ulong offset)
 				isoff = 1;
 			}
 			gtexture(dst, rect, src, fc);
-			if(islcd && dst->base < endscreen)
+			if(dst->base < endscreen)
 				mbbrect(rect);
 			m -= 23;
 			p += 23;
@@ -1494,7 +1454,7 @@ bitwrite(Chan *c, void *va, long n, ulong offset)
 				t = (t/ws)*ws;
 				l = (t+dst->r.max.x+ws-1)/ws;
 			}
-			if(islcd && dst->base < endscreen)
+			if(dst->base < endscreen)
 				mbbrect(Rect(dst->r.min.x, miny, dst->r.max.x, maxy));
 			p += 11;
 			m -= 11;
@@ -1607,10 +1567,7 @@ bitwrite(Chan *c, void *va, long n, ulong offset)
 	poperror();
 	if(isoff)
 		cursoron(1);
-	if(islcd) {
-		screenupdate(mbb);
-		mbb = Rect(10000, 10000, -10000, -10000);
-	}
+	screenupdate();
 	qunlock(&bit);
 	return n;
 }
@@ -1962,8 +1919,7 @@ cursoron(int dolock)
 			&clr, Rect(0, 0, 16, 16), flipping? flipD[D&~S] : D&~S);
 		gbitblt(&gscreen, cursor.r.min,
 			&set, Rect(0, 0, 16, 16), flipping? flipD[S|D] : S|D);
-		if(islcd)
-			mbbrect(cursor.r);
+		mbbrect(cursor.r);
 	}
 	if(dolock)
 		unlock(&cursor);
@@ -1976,8 +1932,7 @@ cursoroff(int dolock)
 		lock(&cursor);
 	if(--cursor.visible == 0) {
 		gbitblt(&gscreen, cursor.r.min, &cursorback, Rect(0, 0, 16, 16), S);
-		if(islcd)
-			mbbrect(cursor.r);
+		mbbrect(cursor.r);
 	}
 	if(dolock)
 		unlock(&cursor);
@@ -2026,8 +1981,7 @@ mouseupdate(int dolock)
 	cursoroff(0);
 	mouse.xy = Pt(x, y);
 	cursoron(0);
-	if(islcd)
-		wakeup(&lcdmouse);
+	mousescreenupdate();
 	mouse.dx = 0;
 	mouse.dy = 0;
 	mouse.clock = 0;
diff --git a/port/devproc.c b/port/devproc.c
index dc16b0eaffa175a7231866802d92c1c89c535aa3..6fb94dd752b3f1a9a75f57f0906fcec4e95c6333 100644
--- a/port/devproc.c
+++ b/port/devproc.c
@@ -669,7 +669,7 @@ procctlmemio(Proc *p, ulong offset, int n, void *va, int read)
 	return n;
 }
 
-Segment *
+Segment*
 txt2data(Proc *p, Segment *s)
 {
 	int i;
@@ -695,3 +695,18 @@ txt2data(Proc *p, Segment *s)
 
 	return ps;
 }
+
+Segment*
+data2txt(Segment *s)
+{
+	Segment *ps;
+
+	ps = newseg(SG_TEXT, s->base, s->size);
+	ps->image = s->image;
+	incref(ps->image);
+	ps->fstart = s->fstart;
+	ps->flen = s->flen;
+	ps->flushme = 1;
+
+	return ps;
+}
diff --git a/port/devscc.c b/port/devscc.c
index fab9363c599740896f177b95bb58276f0c1933c3..9a77aa7f810593b00d825a4062a910305f2e56d6 100644
--- a/port/devscc.c
+++ b/port/devscc.c
@@ -284,7 +284,7 @@ sccsetup0(SCC *sp, int brsource)
 	 *  turn on baud rate generator and set rate to 9600 baud.
 	 *  use 1 stop bit.
 	 */
-	sp->sticky[14] = BRSource;
+	sp->sticky[14] = brsource ? BRSource : 0;
 	sccwrreg(sp, 14, 0);
 	sccsetbaud(sp, 9600);
 	sp->sticky[4] = Rx1stop | X16;
diff --git a/port/portfns.h b/port/portfns.h
index 82687cbe8a06cb65b3010dd012841fae16fd523f..146dd854f72cc4272c1d5abc02ffddfcdeb1674d 100644
--- a/port/portfns.h
+++ b/port/portfns.h
@@ -31,6 +31,7 @@ int		consactive(void);
 void		consdebug(void);
 Block*		copyb(Block*, int);
 void		copypage(Page*, Page*);
+Segment*	data2txt(Segment*);
 int		decref(Ref*);
 int		decrypt(void*, void*, int);
 void		delay(int);
@@ -107,6 +108,8 @@ int		m3mouseputc(IOQ*, int);
 void		machinit(void);
 void*		malloc(ulong);
 void		mapstack(Proc*);
+void		mbbpt(Point);
+void		mbbrect(Rectangle);
 void		mfreeseg(Segment*, ulong, int);
 void		mmurelease(Proc*);
 void		mntdump(void);
@@ -116,6 +119,7 @@ void		mousebuttons(int);
 void		mousectl(char*);
 void		mouseclock(void);
 int		mouseputc(IOQ*, int);
+void		mousescreenupdate(void);
 int		msize(void*);
 Chan*		namec(char*, int, int, ulong);
 void		nameok(char*);
@@ -200,7 +204,7 @@ void		sccspecial(int, IOQ*, IOQ*, int);
 void		sched(void);
 void		schedinit(void);
 int		screenbits(void);
-void		screenupdate(Rectangle);
+void		screenupdate(void);
 Scsibuf*	scsialloc(ulong);
 int		scsibread(int, Scsibuf*, long, long, long);
 Scsibuf*	scsibuf(void);
@@ -266,5 +270,5 @@ void		xhole(ulong, ulong);
 void		xinit(void);
 void*		xspanalloc(ulong, int, ulong);
 void		xsummary(void);
-Segment*	dupseg(Segment*, int);
+Segment*	dupseg(Segment**, int, int);
 Segment*	seg(Proc*, ulong, int);
diff --git a/port/segment.c b/port/segment.c
index 183817488e732682567de4fe339b9147f4d7bcb5..d82591f0b28c3901aae1c57b0ef1aa74ca09ac07 100644
--- a/port/segment.c
+++ b/port/segment.c
@@ -103,13 +103,15 @@ relocateseg(Segment *s, ulong offset)
 }
 
 Segment*
-dupseg(Segment *s, int share)
+dupseg(Segment **seg, int segno, int share)
 {
 	int i;
 	Pte *pte;
-	Segment *n;
+	Segment *n, *s;
 
 	SET(n);
+	s = seg[segno];
+
 	switch(s->type&SG_TYPE) {
 	case SG_TEXT:			/* New segment shares pte set */
 	case SG_SHARED:
@@ -135,6 +137,9 @@ dupseg(Segment *s, int share)
 		break;
 
 	case SG_DATA:			/* Copy on write plus demand load info */
+		if(segno == TSEG)
+			return data2txt(s);
+
 		qlock(&s->lk);
 		if(share && s->ref == 1) {
 			s->type = (s->type&~SG_TYPE)|SG_SHDATA;
diff --git a/port/sysproc.c b/port/sysproc.c
index f00e4414f4669845a52e413a3a992f4e2752e419..bb40ec5b63e484ec3977c76b143d2823459c0cfd 100644
--- a/port/sysproc.c
+++ b/port/sysproc.c
@@ -102,8 +102,8 @@ sysrfork(ulong *arg)
 	n = flag & RFMEM;
 	for(i = 0; i < NSEG; i++)
 		if(parent->seg[i])
-			p->seg[i] = dupseg(parent->seg[i], n);
-
+			p->seg[i] = dupseg(parent->seg, i, n);
+	
 	/* Refs */
 	incref(u->dot);	
 
diff --git a/ss/screen.c b/ss/screen.c
index dc4b29732b43ae758cdd7d87d6b1ded9aa58bca4..5847d5892d361aabf3fcf6cce8e967682b40280a 100644
--- a/ss/screen.c
+++ b/ss/screen.c
@@ -553,9 +553,3 @@ mousectl(char *arg)
 {
 	USED(arg);
 }
-
-void
-screenupdate(Rectangle r)
-{
-	USED(r);
-}
diff --git a/ss/screen.h b/ss/screen.h
index a3dd699a525856e050fc5a74688ba926b93df537..04fd048b804c96347861a49ecae322422183ad7f 100644
--- a/ss/screen.h
+++ b/ss/screen.h
@@ -29,3 +29,8 @@ extern Cursorinfo	cursor;
 extern void		mouseupdate(int);
 
 #define	hwscreenwrite(a, b)
+
+#define mbbpt(x)
+#define mbbrect(x)
+#define screenupdate()
+#define mousescreenupdate()