H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 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 | /* |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 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 | |
H. Peter Anvin | 2495fbf | 2009-06-26 10:53:57 -0700 | [diff] [blame] | 20 | /* |
| 21 | * This code uses an extended set of video mode numbers. These include: |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 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 | |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 59 | void store_screen(void); |
| 60 | #define DO_STORE() store_screen() |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 61 | |
| 62 | /* |
| 63 | * Mode table structures |
| 64 | */ |
| 65 | |
| 66 | struct mode_info { |
| 67 | u16 mode; /* Mode number (vga= style) */ |
H. Peter Anvin | 1cac500 | 2008-01-30 13:33:02 +0100 | [diff] [blame] | 68 | u16 x, y; /* Width, height */ |
| 69 | u16 depth; /* Bits per pixel, 0 for text mode */ |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 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 | |
David Woodhouse | 9b3965f | 2014-01-08 11:21:21 +0000 | [diff] [blame] | 83 | #define __videocard struct card_info __attribute__((used,section(".videocards"))) |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 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 | |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 99 | /* Accessing VGA indexed registers */ |
| 100 | static inline u8 in_idx(u16 port, u8 index) |
| 101 | { |
| 102 | outb(index, port); |
| 103 | return inb(port+1); |
| 104 | } |
| 105 | |
| 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 */ |
| 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 */ |