/* SccsID = @(#)egavideo.h	1.13 11/22/93 Copyright Insignia Solutions */

#define ega_char_height	  0x485 /* word on IBM, but second byte always 0 */
#define ega_info	  0x487 /* lots of useful info. */
#define ega_info3	  0x488 /* EGA switches + feature bits. == 0xf9 */
#define EGA_SAVEPTR	  0x4A8    /* offset into M of pointer to pointer table for parms etc */
#define VGA_DCC		  0x48A	/* offset into M of index into dcc table */

/* fields of info & info3: */
#define get_EGA_no_clear() (sas_hw_at_no_check(ega_info) & 0x80)
#define get_EGA_disp() ((sas_hw_at_no_check(ega_info) & 2)>>1)
#define get_EGA_mem() ((sas_hw_at_no_check(ega_info) & 0x60)>>5)
#define get_EGA_cursor_no_emulate() (sas_hw_at_no_check(ega_info) & 1)
#define set_EGA_cursor_no_emulate(val)	\
	sas_store_no_check(ega_info,	\
	(sas_hw_at_no_check(ega_info) & 0xfe) | (val));

#define get_EGA_feature() (sas_hw_at_no_check(ega_info3) & 0xf0)>>4
#define get_EGA_switches() (sas_hw_at_no_check(ega_info3) & 0xf)
/* offset into each entry of each section of ega mode parameters */
#define EGA_PARMS_COLS 0
#define EGA_PARMS_ROWS 1
#define EGA_PARMS_HEIGHT 2
#define EGA_PARMS_LENGTH 3	/* Word */
#define EGA_PARMS_SEQ	5	/* Sequencer regs 1-4 */
#define EGA_PARMS_SEQ_SIZE 4
#define EGA_PARMS_MISC  9	/* Misc. register */
#define EGA_PARMS_CRTC	10	/* CRT regs 0-24 */
#define EGA_PARMS_CRTC_SIZE 25
#define EGA_PARMS_CURSOR 20	/* CRT regs 10 & 11 */
#define EGA_PARMS_ATTR	35	/* Attribute regs 0-19 */
#define EGA_PARMS_ATTR_SIZE 20
#define EGA_PARMS_GRAPH 55	/* Graphics regs 0-8 */
#define EGA_PARMS_GRAPH_SIZE 9
#define EGA_PARMS_SIZE 64	/* Size of one entry in table */
#define FONT_LOAD_MODE 0xB	/* Screen 'mode' to use to load fonts */
/* Location of default ega mode parameters */
#define EGA_PARMS_OFFSET 0x0F09
#define VGA_PARMS_OFFSET 0x0150	/* was F09 but now have more modes in parm table */

#define EGA_PALETTE_ENABLE	0x20

/* Offsets into the save table of the various pointers */

/* Offsets into the save table of the various pointers */
#define PALETTE_OFFSET 4
#define ALPHA_FONT_OFFSET 8
#define GRAPH_FONT_OFFSET 12

/* Location of font definitions */
#if 0
#define EGA_CGMN	0xC2230
#define EGA_CGDDOT	0xC3160
#define EGA_HIFONT	0xC3990		/* 8x16 font for 640x480 ext */
#define EGA_CGMN_OFF	0x2230
#define EGA_CGMN_FDG_OFF 0x3030
#define EGA_CGDDOT_OFF	0x3160
#define EGA_HIFONT_OFF	0x3990
#define EGA_INT1F_OFF	0x3560
#endif

#ifdef VGG
/* Flags controlling extra bits of VGA BIOS, not in EGA one */
#define VGA_FLAGS	0x489
#define S350 		0
#define S400		0x10
#define S200		0x80
#define PAL_LOAD_OFF	0x8
#define VGA_MONO	0x4
#define GREY_SCALE	0x2
#define VGA_ACTIVE	0x1
#define get_VGA_flags() sas_hw_at_no_check(VGA_FLAGS)
#define set_VGA_flags(val) sas_store_no_check(VGA_FLAGS, (val))
#define get_VGA_lines() (sas_hw_at_no_check(VGA_FLAGS) & 0x90)
#define set_VGA_lines(val) sas_store_no_check(VGA_FLAGS, (sas_hw_at_no_check(VGA_FLAGS) & 0x6f) | (val))
#define is_GREY()	(sas_hw_at_no_check(VGA_FLAGS) & 2)
#define set_GREY(val)	sas_store_no_check(VGA_FLAGS, (sas_hw_at_no_check(VGA_FLAGS) & 0xfd) | (val))
#define is_PAL_load_off() (sas_hw_at_no_check(VGA_FLAGS) & 0x80)
#define set_PAL_load_off(val) sas_store_no_check(VGA_FLAGS, (sas_hw_at_no_check(VGA_FLAGS) & 0xf7) | (val))
#define is_MONO()	(sas_hw_at_no_check(VGA_FLAGS) & 4)

/* Location of INT10 AX=1b, second stage info table */
#define INT10_1B_DATA	0x01bc
#endif

/*
 * Defines for values indicating real number of scanlines on display
 * These are the values returned by INT10 AH=1B, and are also used
 * internally
 */
#define RS200	0
#define RS350	1
#define RS400	2
#define RS480	3

#ifdef ANSI
extern int get_scanlines(void);
extern sys_addr find_mode_table(int,sys_addr *);
extern sys_addr follow_ptr(sys_addr);
#else
extern int get_scanlines();
extern sys_addr find_mode_table();
extern sys_addr follow_ptr();
#endif /* ANSI */

#ifdef MSWDVR
IMPORT VOID host_mswin_disable IPT0();
#endif

#ifdef V7VGA
IMPORT VOID v7vga_extended_set_mode IPT0();
IMPORT VOID v7vga_func_6f IPT0();
#endif

#ifdef VGG
IMPORT VOID vga_set_palette IPT0();
IMPORT VOID vga_func_12 IPT0();
IMPORT VOID init_vga_dac IPT1( int, table );
#endif

#if defined(NTVDM) && defined(MONITOR)

#define F8x14    0
#define F8x8pt1  1
#define F8x8pt2  2
#define F9x14    3
#define F8x16    4
#define F9x16    5

typedef struct {
	word seg;
	word off;
} NativeFontAddr;

IMPORT NativeFontAddr nativeFontAddresses[6];
#endif	/* NTVDM & MONITOR */