/**
 ** vgaregs.h ---- EGA/VGA register declarations
 **
 ** Copyright (c) 1995 Csaba Biegl, 820 Stirrup Dr, Nashville, TN 37221
 ** [e-mail: csaba@vuse.vanderbilt.edu]
 **
 ** This file is part of the GRX graphics library.
 **
 ** The GRX graphics library is free software; you can redistribute it
 ** and/or modify it under some conditions; see the "copying.grx" file
 ** for details.
 **
 ** This library is distributed in the hope that it will be useful,
 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 **
 **/

/*
 * color plane operations
 */
#define VGA_FUNC_SET	0
#define VGA_FUNC_AND	8
#define VGA_FUNC_OR	16
#define VGA_FUNC_XOR	24

/*
 * Sequencer port and frequently used register indices
 */
#define VGA_SEQUENCER_PORT	0x3c4
#define VGA_SEQUENCER_DATA	0x3c5

#define VGA_WRT_PLANE_ENB_REG	2

/*
 * Graphics controller port and frequently used registers
 */
#define VGA_GR_CTRL_PORT	0x3ce
#define VGA_GR_CTRL_DATA	0x3cf

#define VGA_SET_RESET_REG	0
#define VGA_SET_RESET_ENB_REG	1
#define VGA_COLOR_COMP_REG	2
#define VGA_ROT_FN_SEL_REG	3
#define VGA_RD_PLANE_SEL_REG	4
#define VGA_MODE_REG		5
#define VGA_MISC_REG		6
#define VGA_COLOR_DONTC_REG	7
#define VGA_BIT_MASK_REG	8