From ead28738afe0faf30c193353a154448a62c6b503 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Wed, 16 Dec 1992 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1992-12-16

---
 pc/devfloppy.c | 10 ++++++++--
 pc/devvga.c    | 27 ++++++++++++++++++++++-----
 port/devbit.c  |  2 --
 port/portfns.h |  2 ++
 4 files changed, 32 insertions(+), 9 deletions(-)

diff --git a/pc/devfloppy.c b/pc/devfloppy.c
index 1dae23bd010fb58c7b6cd10ac889ba3c4177eba3..6937f0c138f6b0a912d5150ec97a84807561a6a0 100644
--- a/pc/devfloppy.c
+++ b/pc/devfloppy.c
@@ -392,6 +392,7 @@ changed(Chan *c, Drive *dp)
 	 *  if floppy has changed or first time through
 	 */
 	if((inb(Pdir)&Fchange) || dp->vers == 0){
+DPRINT("changed: msr %ux dir %ux\n", inb(Pmsr), inb(Pdir));
 		dp->vers++;
 		setdef(dp);
 		start = dp->t;
@@ -406,9 +407,9 @@ changed(Chan *c, Drive *dp)
 					break;
 			}
 			floppydir[NFDIR*dp->dev].length = dp->t->cap;
+			floppyon(dp);
 			if(dp->t == start)
 				nexterror();
-			floppyon(dp);
 			DPRINT("changed: trying %s\n", dp->t->name);
 		}
 		floppyxfer(dp, Fread, dp->cache, 0, dp->t->tsize);
@@ -751,6 +752,8 @@ static void
 floppywait(void)
 {
 	tsleep(&fl.r, cmddone, 0, 2000);
+	if(!cmddone(0))
+		floppyintr(0);
 }
 
 /*
@@ -762,6 +765,7 @@ floppyrecal(Drive *dp)
 	dp->ccyl = -1;
 	dp->cyl = -1;
 
+DPRINT("floppyrecal: msr %ux dir %ux\n", inb(Pmsr), inb(Pdir));
 	fl.ncmd = 0;
 	fl.cmd[fl.ncmd++] = Frecal;
 	fl.cmd[fl.ncmd++] = dp->dev;
@@ -803,6 +807,7 @@ floppyrevive(void)
 	 *  reset the controller if it's confused
 	 */
 	if(fl.confused){
+DPRINT("floppyrevive: msr %ux dir %ux\n", inb(Pmsr), inb(Pdir));
 		/* reset controller and turn all motors off */
 		splhi();
 		fl.cmd[0] = 0;
@@ -816,7 +821,8 @@ floppyrevive(void)
 		floppywait();
 		fl.confused = 0;
 		outb(Pdsr, 0);
-		fl.rate = -1;
+		fl.rate = 0;
+DPRINT("floppyrevive: msr %ux dir %ux\n", inb(Pmsr), inb(Pdir));
 	}
 }
 
diff --git a/pc/devvga.c b/pc/devvga.c
index 3129a75c5bd1b43545bf99e6492307b2251311bb..cba7dc4d699b8d836a333e1c3edc1495e6324851 100644
--- a/pc/devvga.c
+++ b/pc/devvga.c
@@ -102,7 +102,8 @@ VGAmode mode13 =
 
 static	Rectangle mbb;
 static	Rectangle NULLMBB = {10000, 10000, -10000, -10000};
-static	void nopage(int), tsengpage(int), parapage(int);
+static	void nopage(int), tsengpage(int), tridentpage(int), parapage(int);
+static	void vgaupdate(void);
 
 /*
  *  definitions of known cards
@@ -116,17 +117,19 @@ struct Vgacard
 
 enum
 {
-	Tseng,		/* tseng labs te4000 */
+	Ati,		/* ATI */
 	Pvga1a,		/* paradise */
-	Ati,
+	Trident,	/* Trident 8900 */
+	Tseng,		/* tseng labs te4000 */
 	Generic,
 };
 
 Vgacard vgacards[] =
 {
+[Ati]		{ "ati", nopage, },
 [Pvga1a]	{ "pvga1a", parapage, },
+[Trident]	{ "trident", tridentpage, },
 [Tseng]		{ "tseng", tsengpage, },
-[Ati]		{ "ati", nopage, },
 [Generic]	{ "generic", nopage, },
 		{ 0, 0, },
 };
@@ -221,8 +224,10 @@ vgaread(Chan *c, void *buf, long n, ulong offset)
 	case Qvgatype:
 		return readstr(offset, buf, n, vgacard->name);
 	case Qvgaport:
+		/* at the moment, I need freedom for the ATI card - ches
 		if (offset + n >= 0x8000 || offset < 0x300)
 			error(Ebadarg);
+		*/
 		for (port=offset; port<offset+n; port++)
 			*cp++ = inb(port);
 		return n;
@@ -286,7 +291,9 @@ vgawrite(Chan *c, void *buf, long n, ulong offset)
 		|| maxx > 1280 || maxy > 1024
 		|| ldepth > 3 || ldepth < 0)
 			error(Ebadarg);
+		cursoroff(1);
 		setscreen(maxx, maxy, ldepth);
+		cursoron(1);
 		return n;
 	case Qvgaport:
 		cp = buf;
@@ -498,7 +505,6 @@ setscreen(int maxx, int maxy, int ldepth)
 	vgascreen.r.min = Pt(0, 0);
 	vgascreen.r.max = Pt(maxx, vgamaxy);
 	vgascreen.clipr = vgascreen.r;
-	memset(vgascreen.base, 0xff, vgascreen.width * BY2WD * vgamaxy);
 
 	/*
 	 *  setup new soft screen, free memory for old screen
@@ -545,6 +551,12 @@ setscreen(int maxx, int maxy, int ldepth)
 		break;
 	}
 	cga = 0;
+
+	/*
+	 * clear screen
+	 */
+	mbb = gscreen.r;
+	vgaupdate();
 }
 
 void
@@ -614,6 +626,11 @@ nopage(int page)
 	USED(page);
 }
 static void
+tridentpage(int page)
+{
+	srout(0x0e, page^0x02);	/* yes, the page bit needs to be toggled! */
+}
+static void
 tsengpage(int page)
 {
 	outb(0x3cd, (page<<4)|page);
diff --git a/port/devbit.c b/port/devbit.c
index 4a24b4b62b32211839aa20b3fecaea615cf8068c..795a89cc5ee00902a149bc28231452b619174fc2 100644
--- a/port/devbit.c
+++ b/port/devbit.c
@@ -159,8 +159,6 @@ GBitmap cursorback =
 };
 
 void	Cursortocursor(Cursor*);
-void	cursoron(int);
-void	cursoroff(int);
 int	mousechanged(void*);
 
 enum{
diff --git a/port/portfns.h b/port/portfns.h
index ce3f54168ce55ad546407e08190a73230f3eacf9..ae6c9d40b1e7940e58c73a435d9c3039c7e374ae 100644
--- a/port/portfns.h
+++ b/port/portfns.h
@@ -33,6 +33,8 @@ int		consactive(void);
 void		consdebug(void);
 Block*		copyb(Block*, int);
 void		copypage(Page*, Page*);
+void		cursoron(int);
+void		cursoroff(int);
 Segment*	data2txt(Segment*);
 int		decref(Ref*);
 int		decrypt(void*, void*, int);