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 VIDEO_FIRST_MENU 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(port, 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