1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | /* -*- linux-c -*- ------------------------------------------------------- * |
3 | * |
4 | * Copyright (C) 1991, 1992 Linus Torvalds |
5 | * Copyright 2007 rPath, Inc. - All Rights Reserved |
6 | * |
7 | * ----------------------------------------------------------------------- */ |
8 | |
9 | /* |
10 | * Header file for the real-mode video probing code |
11 | */ |
12 | |
13 | #ifndef BOOT_VIDEO_H |
14 | #define BOOT_VIDEO_H |
15 | |
16 | #include <linux/types.h> |
17 | |
18 | /* |
19 | * This code uses an extended set of video mode numbers. These include: |
20 | * Aliases for standard modes |
21 | * NORMAL_VGA (-1) |
22 | * EXTENDED_VGA (-2) |
23 | * ASK_VGA (-3) |
24 | * Video modes numbered by menu position -- NOT RECOMMENDED because of lack |
25 | * of compatibility when extending the table. These are between 0x00 and 0xff. |
26 | */ |
27 | #define 0x0000 |
28 | |
29 | /* Standard BIOS video modes (BIOS number + 0x0100) */ |
30 | #define VIDEO_FIRST_BIOS 0x0100 |
31 | |
32 | /* VESA BIOS video modes (VESA number + 0x0200) */ |
33 | #define VIDEO_FIRST_VESA 0x0200 |
34 | |
35 | /* Video7 special modes (BIOS number + 0x0900) */ |
36 | #define VIDEO_FIRST_V7 0x0900 |
37 | |
38 | /* Special video modes */ |
39 | #define VIDEO_FIRST_SPECIAL 0x0f00 |
40 | #define VIDEO_80x25 0x0f00 |
41 | #define VIDEO_8POINT 0x0f01 |
42 | #define VIDEO_80x43 0x0f02 |
43 | #define VIDEO_80x28 0x0f03 |
44 | #define VIDEO_CURRENT_MODE 0x0f04 |
45 | #define VIDEO_80x30 0x0f05 |
46 | #define VIDEO_80x34 0x0f06 |
47 | #define VIDEO_80x60 0x0f07 |
48 | #define VIDEO_GFX_HACK 0x0f08 |
49 | #define VIDEO_LAST_SPECIAL 0x0f09 |
50 | |
51 | /* Video modes given by resolution */ |
52 | #define VIDEO_FIRST_RESOLUTION 0x1000 |
53 | |
54 | /* The "recalculate timings" flag */ |
55 | #define VIDEO_RECALC 0x8000 |
56 | |
57 | void store_screen(void); |
58 | #define DO_STORE() store_screen() |
59 | |
60 | /* |
61 | * Mode table structures |
62 | */ |
63 | |
64 | struct mode_info { |
65 | u16 mode; /* Mode number (vga= style) */ |
66 | u16 x, y; /* Width, height */ |
67 | u16 depth; /* Bits per pixel, 0 for text mode */ |
68 | }; |
69 | |
70 | struct card_info { |
71 | const char *card_name; |
72 | int (*set_mode)(struct mode_info *mode); |
73 | int (*probe)(void); |
74 | struct mode_info *modes; |
75 | int nmodes; /* Number of probed modes so far */ |
76 | int unsafe; /* Probing is unsafe, only do after "scan" */ |
77 | u16 xmode_first; /* Unprobed modes to try to call anyway */ |
78 | u16 xmode_n; /* Size of unprobed mode range */ |
79 | }; |
80 | |
81 | #define __videocard struct card_info __section(".videocards") __attribute__((used)) |
82 | extern struct card_info video_cards[], video_cards_end[]; |
83 | |
84 | int mode_defined(u16 mode); /* video.c */ |
85 | |
86 | /* Basic video information */ |
87 | #define ADAPTER_CGA 0 /* CGA/MDA/HGC */ |
88 | #define ADAPTER_EGA 1 |
89 | #define ADAPTER_VGA 2 |
90 | |
91 | extern int adapter; |
92 | extern int force_x, force_y; /* Don't query the BIOS for cols/rows */ |
93 | extern int do_restore; /* Restore screen contents */ |
94 | extern int graphic_mode; /* Graphics mode with linear frame buffer */ |
95 | |
96 | /* Accessing VGA indexed registers */ |
97 | static inline u8 in_idx(u16 port, u8 index) |
98 | { |
99 | outb(index, port); |
100 | return inb(port+1); |
101 | } |
102 | |
103 | static inline void out_idx(u8 v, u16 port, u8 index) |
104 | { |
105 | outw(index+(v << 8), port); |
106 | } |
107 | |
108 | /* Writes a value to an indexed port and then reads the port again */ |
109 | static inline u8 tst_idx(u8 v, u16 port, u8 index) |
110 | { |
111 | out_idx(v: port, port: index, index: v); |
112 | return in_idx(port, index); |
113 | } |
114 | |
115 | /* Get the I/O port of the VGA CRTC */ |
116 | u16 vga_crtc(void); /* video-vga.c */ |
117 | |
118 | #endif /* BOOT_VIDEO_H */ |
119 | |