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 59void store_screen(void); 60#define DO_STORE() store_screen() 61 62/* 63 * Mode table structures 64 */ 65 66struct 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 72struct 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"))) 84extern struct card_info video_cards[], video_cards_end[]; 85 86int 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 93extern int adapter; 94extern int force_x, force_y; /* Don't query the BIOS for cols/rows */ 95extern int do_restore; /* Restore screen contents */ 96extern int graphic_mode; /* Graphics mode with linear frame buffer */ 97 98/* Accessing VGA indexed registers */ 99static inline u8 in_idx(u16 port, u8 index) 100{ 101 outb(index, port); 102 return inb(port+1); 103} 104 105static 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 */ 111static 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 */ 118u16 vga_crtc(void); /* video-vga.c */ 119 120#endif /* BOOT_VIDEO_H */ 121