devvga: removing #v/vgabios, use /dev/realmodemem instead

sys/man/3/vga

@@ -5,7 +5,6 @@ vga \- VGA controller device
 .nf
 .B bind #v /dev
 
-.B /dev/vgabios
 .B /dev/vgactl
 .B /dev/vgaovl
 .B /dev/vgaovlctl
@@ -23,10 +22,6 @@ it is used to implement configuration and setup of VGA controller cards.
 This is usually performed by
 .IR vga (8).
 .PP
-.B Vgabios
-provides read-only access to the low 640kB of memory,
-where the VGA and other BIOS ROMs are located.
-.PP
 Writing strings to 
 .B vgactl
 configures the VGA device.

sys/src/9/pc/devvga.c

@@ -17,7 +17,6 @@
 
 enum {
 	Qdir,
-	Qvgabios,
 	Qvgactl,
 	Qvgaovl,
 	Qvgaovlctl,
@@ -25,7 +24,6 @@ enum {
 
 static Dirtab vgadir[] = {
 	".",	{ Qdir, 0, QTDIR },		0,	0550,
-	"vgabios",	{ Qvgabios, 0 },	0x100000, 0440,
 	"vgactl",		{ Qvgactl, 0 },		0,	0660,
 	"vgaovl",		{ Qvgaovl, 0 },		0,	0660,
 	"vgaovlctl",	{ Qvgaovlctl, 0 },	0, 	0660,
@@ -155,14 +153,6 @@ vgaread(Chan* c, void* a, long n, vlong off)
 	case Qdir:
 		return devdirread(c, a, n, vgadir, nelem(vgadir), devgen);
 
-	case Qvgabios:
-		if(offset >= 0x100000)
-			return 0;
-		if(offset+n >= 0x100000)
-			n = 0x100000 - offset;
-		memmove(a, (uchar*)kaddr(0)+offset, n);
-		return n;
-
 	case Qvgactl:
 		scr = &vgascreen[0];
 

sys/src/cmd/aux/vga/io.c

@@ -245,7 +245,7 @@ doreadbios(char* buf, long len, long offset)
 	if(biosfd < 0)
 		biosfd = open("/dev/realmodemem", OREAD);
 	if(biosfd < 0)
-		biosfd = devopen("#v/vgabios", OREAD);
+		biosfd = open("#P/realmodemem", OREAD);
 	if(biosfd < 0)
 		return -1;
 	seek(biosfd, offset, 0);