[fbcon] Allow for an arbitrary margin around the text area

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/include/ipxe/console.h

@@ -28,6 +28,14 @@ struct console_configuration {
 	unsigned int height;
 	/** Colour depth */
 	unsigned int bpp;
+	/** Left margin */
+	unsigned int left;
+	/** Right margin */
+	unsigned int right;
+	/** Top margin */
+	unsigned int top;
+	/** Bottom margin */
+	unsigned int bottom;
 	/** Background picture, if any */
 	struct pixel_buffer *pixbuf;
 };

src/include/ipxe/fbcon.h

@@ -145,6 +145,7 @@ struct fbcon {
 
 extern int fbcon_init ( struct fbcon *fbcon, userptr_t start,
 			struct fbcon_geometry *pixel,
+			struct fbcon_margin *margin,
 			struct fbcon_colour_map *map,
 			struct fbcon_font *font,
 			struct pixel_buffer *pixbuf );