Commit | Line | Data |
---|---|---|
5e8ddcbe PA |
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 | /* | |
5e8ddcbe PA |
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 | /* Enable autodetection of SVGA adapters and modes. */ | |
21 | #undef CONFIG_VIDEO_SVGA | |
22 | ||
23 | /* Enable autodetection of VESA modes */ | |
24 | #define CONFIG_VIDEO_VESA | |
25 | ||
26 | /* Retain screen contents when switching modes */ | |
27 | #define CONFIG_VIDEO_RETAIN | |
28 | ||
29 | /* Force 400 scan lines for standard modes (hack to fix bad BIOS behaviour */ | |
30 | #undef CONFIG_VIDEO_400_HACK | |
31 | ||
32 | /* This code uses an extended set of video mode numbers. These include: | |
33 | * Aliases for standard modes | |
34 | * NORMAL_VGA (-1) | |
35 | * EXTENDED_VGA (-2) | |
36 | * ASK_VGA (-3) | |
37 | * Video modes numbered by menu position -- NOT RECOMMENDED because of lack | |
38 | * of compatibility when extending the table. These are between 0x00 and 0xff. | |
39 | */ | |
40 | #define VIDEO_FIRST_MENU 0x0000 | |
41 | ||
42 | /* Standard BIOS video modes (BIOS number + 0x0100) */ | |
43 | #define VIDEO_FIRST_BIOS 0x0100 | |
44 | ||
45 | /* VESA BIOS video modes (VESA number + 0x0200) */ | |
46 | #define VIDEO_FIRST_VESA 0x0200 | |
47 | ||
48 | /* Video7 special modes (BIOS number + 0x0900) */ | |
49 | #define VIDEO_FIRST_V7 0x0900 | |
50 | ||
51 | /* Special video modes */ | |
52 | #define VIDEO_FIRST_SPECIAL 0x0f00 | |
53 | #define VIDEO_80x25 0x0f00 | |
54 | #define VIDEO_8POINT 0x0f01 | |
55 | #define VIDEO_80x43 0x0f02 | |
56 | #define VIDEO_80x28 0x0f03 | |
57 | #define VIDEO_CURRENT_MODE 0x0f04 | |
58 | #define VIDEO_80x30 0x0f05 | |
59 | #define VIDEO_80x34 0x0f06 | |
60 | #define VIDEO_80x60 0x0f07 | |
61 | #define VIDEO_GFX_HACK 0x0f08 | |
62 | #define VIDEO_LAST_SPECIAL 0x0f09 | |
63 | ||
64 | /* Video modes given by resolution */ | |
65 | #define VIDEO_FIRST_RESOLUTION 0x1000 | |
66 | ||
67 | /* The "recalculate timings" flag */ | |
68 | #define VIDEO_RECALC 0x8000 | |
69 | ||
70 | /* Define DO_STORE according to CONFIG_VIDEO_RETAIN */ | |
71 | #ifdef CONFIG_VIDEO_RETAIN | |
72 | void store_screen(void); | |
73 | #define DO_STORE() store_screen() | |
74 | #else | |
75 | #define DO_STORE() ((void)0) | |
76 | #endif /* CONFIG_VIDEO_RETAIN */ | |
77 | ||
78 | /* | |
79 | * Mode table structures | |
80 | */ | |
81 | ||
82 | struct mode_info { | |
83 | u16 mode; /* Mode number (vga= style) */ | |
1cac5004 PA |
84 | u16 x, y; /* Width, height */ |
85 | u16 depth; /* Bits per pixel, 0 for text mode */ | |
5e8ddcbe PA |
86 | }; |
87 | ||
88 | struct card_info { | |
89 | const char *card_name; | |
90 | int (*set_mode)(struct mode_info *mode); | |
91 | int (*probe)(void); | |
92 | struct mode_info *modes; | |
93 | int nmodes; /* Number of probed modes so far */ | |
94 | int unsafe; /* Probing is unsafe, only do after "scan" */ | |
95 | u16 xmode_first; /* Unprobed modes to try to call anyway */ | |
96 | u16 xmode_n; /* Size of unprobed mode range */ | |
97 | }; | |
98 | ||
99 | #define __videocard struct card_info __attribute__((section(".videocards"))) | |
100 | extern struct card_info video_cards[], video_cards_end[]; | |
101 | ||
102 | int mode_defined(u16 mode); /* video.c */ | |
103 | ||
104 | /* Basic video information */ | |
105 | #define ADAPTER_CGA 0 /* CGA/MDA/HGC */ | |
106 | #define ADAPTER_EGA 1 | |
107 | #define ADAPTER_VGA 2 | |
108 | ||
109 | extern int adapter; | |
110 | extern u16 video_segment; | |
111 | extern int force_x, force_y; /* Don't query the BIOS for cols/rows */ | |
112 | extern int do_restore; /* Restore screen contents */ | |
113 | extern int graphic_mode; /* Graphics mode with linear frame buffer */ | |
114 | ||
5e8ddcbe PA |
115 | /* Accessing VGA indexed registers */ |
116 | static inline u8 in_idx(u16 port, u8 index) | |
117 | { | |
118 | outb(index, port); | |
119 | return inb(port+1); | |
120 | } | |
121 | ||
122 | static inline void out_idx(u8 v, u16 port, u8 index) | |
123 | { | |
124 | outw(index+(v << 8), port); | |
125 | } | |
126 | ||
127 | /* Writes a value to an indexed port and then reads the port again */ | |
128 | static inline u8 tst_idx(u8 v, u16 port, u8 index) | |
129 | { | |
130 | out_idx(port, index, v); | |
131 | return in_idx(port, index); | |
132 | } | |
133 | ||
134 | /* Get the I/O port of the VGA CRTC */ | |
135 | u16 vga_crtc(void); /* video-vga.c */ | |
136 | ||
137 | #endif /* BOOT_VIDEO_H */ |