forked from Minki/linux
cf06de7b9c
Impact: BIOS proofing "Glove box" off BIOS interrupts in the video code. LKML-Reference: <49DE7F79.4030106@zytor.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: Rafael J. Wysocki <rjw@sisk.pl>
138 lines
3.7 KiB
C
138 lines
3.7 KiB
C
/* -*- linux-c -*- ------------------------------------------------------- *
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright 2007 rPath, Inc. - All Rights Reserved
|
|
*
|
|
* This file is part of the Linux kernel, and is made available under
|
|
* the terms of the GNU General Public License version 2.
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* Header file for the real-mode video probing code
|
|
*/
|
|
|
|
#ifndef BOOT_VIDEO_H
|
|
#define BOOT_VIDEO_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
/* Enable autodetection of SVGA adapters and modes. */
|
|
#undef CONFIG_VIDEO_SVGA
|
|
|
|
/* Enable autodetection of VESA modes */
|
|
#define CONFIG_VIDEO_VESA
|
|
|
|
/* Retain screen contents when switching modes */
|
|
#define CONFIG_VIDEO_RETAIN
|
|
|
|
/* Force 400 scan lines for standard modes (hack to fix bad BIOS behaviour */
|
|
#undef CONFIG_VIDEO_400_HACK
|
|
|
|
/* This code uses an extended set of video mode numbers. These include:
|
|
* Aliases for standard modes
|
|
* NORMAL_VGA (-1)
|
|
* EXTENDED_VGA (-2)
|
|
* ASK_VGA (-3)
|
|
* Video modes numbered by menu position -- NOT RECOMMENDED because of lack
|
|
* of compatibility when extending the table. These are between 0x00 and 0xff.
|
|
*/
|
|
#define VIDEO_FIRST_MENU 0x0000
|
|
|
|
/* Standard BIOS video modes (BIOS number + 0x0100) */
|
|
#define VIDEO_FIRST_BIOS 0x0100
|
|
|
|
/* VESA BIOS video modes (VESA number + 0x0200) */
|
|
#define VIDEO_FIRST_VESA 0x0200
|
|
|
|
/* Video7 special modes (BIOS number + 0x0900) */
|
|
#define VIDEO_FIRST_V7 0x0900
|
|
|
|
/* Special video modes */
|
|
#define VIDEO_FIRST_SPECIAL 0x0f00
|
|
#define VIDEO_80x25 0x0f00
|
|
#define VIDEO_8POINT 0x0f01
|
|
#define VIDEO_80x43 0x0f02
|
|
#define VIDEO_80x28 0x0f03
|
|
#define VIDEO_CURRENT_MODE 0x0f04
|
|
#define VIDEO_80x30 0x0f05
|
|
#define VIDEO_80x34 0x0f06
|
|
#define VIDEO_80x60 0x0f07
|
|
#define VIDEO_GFX_HACK 0x0f08
|
|
#define VIDEO_LAST_SPECIAL 0x0f09
|
|
|
|
/* Video modes given by resolution */
|
|
#define VIDEO_FIRST_RESOLUTION 0x1000
|
|
|
|
/* The "recalculate timings" flag */
|
|
#define VIDEO_RECALC 0x8000
|
|
|
|
/* Define DO_STORE according to CONFIG_VIDEO_RETAIN */
|
|
#ifdef CONFIG_VIDEO_RETAIN
|
|
void store_screen(void);
|
|
#define DO_STORE() store_screen()
|
|
#else
|
|
#define DO_STORE() ((void)0)
|
|
#endif /* CONFIG_VIDEO_RETAIN */
|
|
|
|
/*
|
|
* Mode table structures
|
|
*/
|
|
|
|
struct mode_info {
|
|
u16 mode; /* Mode number (vga= style) */
|
|
u16 x, y; /* Width, height */
|
|
u16 depth; /* Bits per pixel, 0 for text mode */
|
|
};
|
|
|
|
struct card_info {
|
|
const char *card_name;
|
|
int (*set_mode)(struct mode_info *mode);
|
|
int (*probe)(void);
|
|
struct mode_info *modes;
|
|
int nmodes; /* Number of probed modes so far */
|
|
int unsafe; /* Probing is unsafe, only do after "scan" */
|
|
u16 xmode_first; /* Unprobed modes to try to call anyway */
|
|
u16 xmode_n; /* Size of unprobed mode range */
|
|
};
|
|
|
|
#define __videocard struct card_info __attribute__((section(".videocards")))
|
|
extern struct card_info video_cards[], video_cards_end[];
|
|
|
|
int mode_defined(u16 mode); /* video.c */
|
|
|
|
/* Basic video information */
|
|
#define ADAPTER_CGA 0 /* CGA/MDA/HGC */
|
|
#define ADAPTER_EGA 1
|
|
#define ADAPTER_VGA 2
|
|
|
|
extern int adapter;
|
|
extern u16 video_segment;
|
|
extern int force_x, force_y; /* Don't query the BIOS for cols/rows */
|
|
extern int do_restore; /* Restore screen contents */
|
|
extern int graphic_mode; /* Graphics mode with linear frame buffer */
|
|
|
|
/* Accessing VGA indexed registers */
|
|
static inline u8 in_idx(u16 port, u8 index)
|
|
{
|
|
outb(index, port);
|
|
return inb(port+1);
|
|
}
|
|
|
|
static inline void out_idx(u8 v, u16 port, u8 index)
|
|
{
|
|
outw(index+(v << 8), port);
|
|
}
|
|
|
|
/* Writes a value to an indexed port and then reads the port again */
|
|
static inline u8 tst_idx(u8 v, u16 port, u8 index)
|
|
{
|
|
out_idx(port, index, v);
|
|
return in_idx(port, index);
|
|
}
|
|
|
|
/* Get the I/O port of the VGA CRTC */
|
|
u16 vga_crtc(void); /* video-vga.c */
|
|
|
|
#endif /* BOOT_VIDEO_H */
|