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 int force_x, force_y; /* Don't query the BIOS for cols/rows */ 95 extern int do_restore; /* Restore screen contents */ 96 extern int graphic_mode; /* Graphics mode with linear frame buffer */ 97 98 /* Accessing VGA indexed registers */ 99 static inline u8 in_idx(u16 port, u8 index) 100 { 101 outb(index, port); 102 return inb(port+1); 103 } 104 105 static 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 */ 111 static 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 */ 118 u16 vga_crtc(void); /* video-vga.c */ 119 120 #endif /* BOOT_VIDEO_H */ 121