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
59 void store_screen(void);
60 #define DO_STORE() store_screen()
61
62 /*
63 * Mode table structures
64 */
65
66 struct 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
72 struct 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")))
84 extern struct card_info video_cards[], video_cards_end[];
85
86 int 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
93 extern int adapter;
94 extern u16 video_segment;
95 extern int force_x, force_y; /* Don't query the BIOS for cols/rows */
96 extern int do_restore; /* Restore screen contents */
97 extern int graphic_mode; /* Graphics mode with linear frame buffer */
98
99 /* Accessing VGA indexed registers */
in_idx(u16 port,u8 index)100 static inline u8 in_idx(u16 port, u8 index)
101 {
102 outb(index, port);
103 return inb(port+1);
104 }
105
out_idx(u8 v,u16 port,u8 index)106 static inline void out_idx(u8 v, u16 port, u8 index)
107 {
108 outw(index+(v << 8), port);
109 }
110
111 /* Writes a value to an indexed port and then reads the port again */
tst_idx(u8 v,u16 port,u8 index)112 static inline u8 tst_idx(u8 v, u16 port, u8 index)
113 {
114 out_idx(port, index, v);
115 return in_idx(port, index);
116 }
117
118 /* Get the I/O port of the VGA CRTC */
119 u16 vga_crtc(void); /* video-vga.c */
120
121 #endif /* BOOT_VIDEO_H */
122