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118 lines
3.1 KiB
118 lines
3.1 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* -*- linux-c -*- ------------------------------------------------------- * |
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* |
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* Copyright (C) 1991, 1992 Linus Torvalds |
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* Copyright 2007 rPath, Inc. - All Rights Reserved |
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* |
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* ----------------------------------------------------------------------- */ |
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/* |
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* Header file for the real-mode video probing code |
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*/ |
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#ifndef BOOT_VIDEO_H |
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#define BOOT_VIDEO_H |
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#include <linux/types.h> |
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/* |
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* This code uses an extended set of video mode numbers. These include: |
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* Aliases for standard modes |
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* NORMAL_VGA (-1) |
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* EXTENDED_VGA (-2) |
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* ASK_VGA (-3) |
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* Video modes numbered by menu position -- NOT RECOMMENDED because of lack |
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* of compatibility when extending the table. These are between 0x00 and 0xff. |
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*/ |
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#define VIDEO_FIRST_MENU 0x0000 |
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/* Standard BIOS video modes (BIOS number + 0x0100) */ |
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#define VIDEO_FIRST_BIOS 0x0100 |
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/* VESA BIOS video modes (VESA number + 0x0200) */ |
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#define VIDEO_FIRST_VESA 0x0200 |
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/* Video7 special modes (BIOS number + 0x0900) */ |
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#define VIDEO_FIRST_V7 0x0900 |
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/* Special video modes */ |
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#define VIDEO_FIRST_SPECIAL 0x0f00 |
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#define VIDEO_80x25 0x0f00 |
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#define VIDEO_8POINT 0x0f01 |
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#define VIDEO_80x43 0x0f02 |
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#define VIDEO_80x28 0x0f03 |
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#define VIDEO_CURRENT_MODE 0x0f04 |
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#define VIDEO_80x30 0x0f05 |
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#define VIDEO_80x34 0x0f06 |
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#define VIDEO_80x60 0x0f07 |
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#define VIDEO_GFX_HACK 0x0f08 |
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#define VIDEO_LAST_SPECIAL 0x0f09 |
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/* Video modes given by resolution */ |
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#define VIDEO_FIRST_RESOLUTION 0x1000 |
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/* The "recalculate timings" flag */ |
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#define VIDEO_RECALC 0x8000 |
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void store_screen(void); |
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#define DO_STORE() store_screen() |
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/* |
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* Mode table structures |
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*/ |
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struct mode_info { |
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u16 mode; /* Mode number (vga= style) */ |
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u16 x, y; /* Width, height */ |
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u16 depth; /* Bits per pixel, 0 for text mode */ |
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}; |
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struct card_info { |
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const char *card_name; |
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int (*set_mode)(struct mode_info *mode); |
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int (*probe)(void); |
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struct mode_info *modes; |
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int nmodes; /* Number of probed modes so far */ |
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int unsafe; /* Probing is unsafe, only do after "scan" */ |
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u16 xmode_first; /* Unprobed modes to try to call anyway */ |
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u16 xmode_n; /* Size of unprobed mode range */ |
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}; |
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#define __videocard struct card_info __section(".videocards") __attribute__((used)) |
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extern struct card_info video_cards[], video_cards_end[]; |
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int mode_defined(u16 mode); /* video.c */ |
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/* Basic video information */ |
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#define ADAPTER_CGA 0 /* CGA/MDA/HGC */ |
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#define ADAPTER_EGA 1 |
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#define ADAPTER_VGA 2 |
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extern int adapter; |
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extern int force_x, force_y; /* Don't query the BIOS for cols/rows */ |
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extern int do_restore; /* Restore screen contents */ |
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extern int graphic_mode; /* Graphics mode with linear frame buffer */ |
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/* Accessing VGA indexed registers */ |
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static inline u8 in_idx(u16 port, u8 index) |
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{ |
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outb(index, port); |
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return inb(port+1); |
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} |
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static inline void out_idx(u8 v, u16 port, u8 index) |
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{ |
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outw(index+(v << 8), port); |
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} |
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/* Writes a value to an indexed port and then reads the port again */ |
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static inline u8 tst_idx(u8 v, u16 port, u8 index) |
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{ |
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out_idx(port, index, v); |
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return in_idx(port, index); |
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} |
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/* Get the I/O port of the VGA CRTC */ |
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u16 vga_crtc(void); /* video-vga.c */ |
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#endif /* BOOT_VIDEO_H */
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