cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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video.h (3163B)

      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
     57void store_screen(void);
     58#define DO_STORE() store_screen()
     59
     60/*
     61 * Mode table structures
     62 */
     63
     64struct 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
     70struct 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))
     82extern struct card_info video_cards[], video_cards_end[];
     83
     84int 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
     91extern int adapter;
     92extern int force_x, force_y;	/* Don't query the BIOS for cols/rows */
     93extern int do_restore;		/* Restore screen contents */
     94extern int graphic_mode;	/* Graphics mode with linear frame buffer */
     95
     96/* Accessing VGA indexed registers */
     97static inline u8 in_idx(u16 port, u8 index)
     98{
     99	outb(index, port);
    100	return inb(port+1);
    101}
    102
    103static 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 */
    109static 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 */
    116u16 vga_crtc(void);		/* video-vga.c */
    117
    118#endif /* BOOT_VIDEO_H */