1/* -*- linux-c -*- ------------------------------------------------------- *
2 *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright 2007 rPath, Inc. - All Rights Reserved
5 *
6 * This file is part of the Linux kernel, and is made available under
7 * the terms of the GNU General Public License version 2.
8 *
9 * ----------------------------------------------------------------------- */
10
11/*
12 * Header file for the real-mode video probing code
13 */
14
15#ifndef BOOT_VIDEO_H
16#define BOOT_VIDEO_H
17
18#include <linux/types.h>
19
20/*
21 * This code uses an extended set of video mode numbers. These include:
22 * Aliases for standard modes
23 * NORMAL_VGA (-1)
24 * EXTENDED_VGA (-2)
25 * ASK_VGA (-3)
26 * Video modes numbered by menu position -- NOT RECOMMENDED because of lack
27 * of compatibility when extending the table. These are between 0x00 and 0xff.
28 */
29#define VIDEO_FIRST_MENU 0x0000
30
31/* Standard BIOS video modes (BIOS number + 0x0100) */
32#define VIDEO_FIRST_BIOS 0x0100
33
34/* VESA BIOS video modes (VESA number + 0x0200) */
35#define VIDEO_FIRST_VESA 0x0200
36
37/* Video7 special modes (BIOS number + 0x0900) */
38#define VIDEO_FIRST_V7 0x0900
39
40/* Special video modes */
41#define VIDEO_FIRST_SPECIAL 0x0f00
42#define VIDEO_80x25 0x0f00
43#define VIDEO_8POINT 0x0f01
44#define VIDEO_80x43 0x0f02
45#define VIDEO_80x28 0x0f03
46#define VIDEO_CURRENT_MODE 0x0f04
47#define VIDEO_80x30 0x0f05
48#define VIDEO_80x34 0x0f06
49#define VIDEO_80x60 0x0f07
50#define VIDEO_GFX_HACK 0x0f08
51#define VIDEO_LAST_SPECIAL 0x0f09
52
53/* Video modes given by resolution */
54#define VIDEO_FIRST_RESOLUTION 0x1000
55
56/* The "recalculate timings" flag */
57#define VIDEO_RECALC 0x8000
58
59void store_screen(void);
60#define DO_STORE() store_screen()
61
62/*
63 * Mode table structures
64 */
65
66struct mode_info {
67 u16 mode; /* Mode number (vga= style) */
68 u16 x, y; /* Width, height */
69 u16 depth; /* Bits per pixel, 0 for text mode */
70};
71
72struct card_info {
73 const char *card_name;
74 int (*set_mode)(struct mode_info *mode);
75 int (*probe)(void);
76 struct mode_info *modes;
77 int nmodes; /* Number of probed modes so far */
78 int unsafe; /* Probing is unsafe, only do after "scan" */
79 u16 xmode_first; /* Unprobed modes to try to call anyway */
80 u16 xmode_n; /* Size of unprobed mode range */
81};
82
83#define __videocard struct card_info __attribute__((used,section(".videocards")))
84extern struct card_info video_cards[], video_cards_end[];
85
86int mode_defined(u16 mode); /* video.c */
87
88/* Basic video information */
89#define ADAPTER_CGA 0 /* CGA/MDA/HGC */
90#define ADAPTER_EGA 1
91#define ADAPTER_VGA 2
92
93extern int adapter;
94extern int force_x, force_y; /* Don't query the BIOS for cols/rows */
95extern int do_restore; /* Restore screen contents */
96extern int graphic_mode; /* Graphics mode with linear frame buffer */
97
98/* Accessing VGA indexed registers */
99static inline u8 in_idx(u16 port, u8 index)
100{
101 outb(index, port);
102 return inb(port+1);
103}
104
105static inline void out_idx(u8 v, u16 port, u8 index)
106{
107 outw(index+(v << 8), port);
108}
109
110/* Writes a value to an indexed port and then reads the port again */
111static inline u8 tst_idx(u8 v, u16 port, u8 index)
112{
113 out_idx(port, index, v);
114 return in_idx(port, index);
115}
116
117/* Get the I/O port of the VGA CRTC */
118u16 vga_crtc(void); /* video-vga.c */
119
120#endif /* BOOT_VIDEO_H */
121