1 files changed, 75 insertions, 0 deletions
diff --git a/os/pc/vga.h b/os/pc/vga.h
new file mode 100644
index 00000000..685a8ee5
--- /dev/null
+++ b/os/pc/vga.h
@@ -0,0 +1,75 @@
+/*
+ * Generic VGA registers.
+ */
+enum {
+	MiscW		= 0x03C2,	/* Miscellaneous Output (W) */
+	MiscR		= 0x03CC,	/* Miscellaneous Output (R) */
+	Status0		= 0x03C2,	/* Input status 0 (R) */
+	Status1		= 0x03DA,	/* Input Status 1 (R) */
+	FeatureR	= 0x03CA,	/* Feature Control (R) */
+	FeatureW	= 0x03DA,	/* Feature Control (W) */
+
+	Seqx		= 0x03C4,	/* Sequencer Index, Data at Seqx+1 */
+	Crtx		= 0x03D4,	/* CRT Controller Index, Data at Crtx+1 */
+	Grx		= 0x03CE,	/* Graphics Controller Index, Data at Grx+1 */
+	Attrx		= 0x03C0,	/* Attribute Controller Index and Data */
+
+	PaddrW		= 0x03C8,	/* Palette Address Register, write */
+	Pdata		= 0x03C9,	/* Palette Data Register */
+	Pixmask		= 0x03C6,	/* Pixel Mask Register */
+	PaddrR		= 0x03C7,	/* Palette Address Register, read */
+	Pstatus		= 0x03C7,	/* DAC Status (RO) */
+
+	Pcolours	= 256,		/* Palette */
+	Pred		= 0,
+	Pgreen		= 1,
+	Pblue		= 2,
+
+	Pblack		= 0x00,
+	Pwhite		= 0xFF,
+};
+
+#define vgai(port)		inb(port)
+#define vgao(port, data)	outb(port, data)
+
+extern int vgaxi(long, uchar);
+extern int vgaxo(long, uchar, uchar);
+
+typedef struct Cursor Cursor;
+struct	Cursor
+{
+	Point	offset;
+	uchar	clr[2*16];
+	uchar	set[2*16];
+};
+
+/*
+ * First pass at tidying this up...
+ */
+typedef struct Mode {
+	int	x;
+	int	y;
+	int	d;
+
+	ulong	aperture;		/* this is a physical address */
+	int	apsize;
+	int	apshift;
+} Mode;
+
+/*
+ * Definitions of known VGA controllers.
+ */
+typedef struct Vgac Vgac;
+struct Vgac {
+	char*	name;
+	void	(*page)(int);
+	void	(*init)(Mode*);
+	int	(*ident)(void);
+	void	(*enable)(void);
+	void	(*disable)(void);
+	void	(*move)(int, int);
+	void	(*load)(Cursor*);
+	Vgac*	link;
+};
+
+extern void addvgaclink(Vgac*);