ovfw              160 arch/x86/boot/video-vga.c 	u8  ovfw;		/* CRTC overflow register */
ovfw              165 arch/x86/boot/video-vga.c 	ovfw = 0x3c | ((end >> (8-1)) & 0x02) | ((end >> (9-6)) & 0x40);
ovfw              167 arch/x86/boot/video-vga.c 	out_idx(ovfw, crtc, 0x07); /* Vertical overflow */