119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
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/* 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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