0
     =€ОНѓt-9МѕП к    =/* SPDX-License-Identifier: GPL-2.0 */
/*
 * console_struct.h
 *
 * Data structure describing single virtual console except for data
 * used by vt.c.
 *
 * Fields marked with [#] must be set by the low-level driver.
 * Fields marked with [!] can be changed by the low-level driver
 * to achieve effects such as fast scrolling by changing the origin.
 */

#ifndef _LINUX_CONSOLE_STRUCT_H
#define _LINUX_CONSOLE_STRUCT_H

#include <linux/wait.h>
#include <linux/vt.h>
#include <linux/workqueue.h>

struct uni_pagedict;

#define NPAR 16
#define VC_TABSTOPS_COUNT	256U

enum vc_intensity {
	VCI_HALF_BRIGHT,
	VCI_NORMAL,
	VCI_BOLD,
	VCI_MASK = 0x3,
};

/**
 * struct vc_state -- state of a VC
 * @x: cursor's x-position
 * @y: cursor's y-position
 * @color: foreground & background colors
 * @Gx_charset: what's G0/G1 slot set to (like GRAF_MAP, LAT1_MAP)
 * @charset: what character set to use (0=G0 or 1=G1)
 * @intensity: see enum vc_intensity for values
 * @reverse: reversed foreground/background colors
 *
 * These members are defined separately from struct vc_data as we save &
 * restore them at times.
 */
struct vc_state {
	unsigned int	x, y;

	unsigned char	color;

	unsigned char	Gx_charset[2];
	unsigned int	charset		: 1;

	/* attribute flags */
	enum vc_intensity intensity;
	bool		italic;
	bool		underline;
	bool		blink;
	bool		reverse;
};

/*
 * Example: vc_data of a console that was scrolled 3 lines down.
 *
 *                              Console buffer
 * vc_screenbuf ---------> +----------------------+-.
 *                         | initializing W       |  \
 *                         | initializing X       |   |
 *                         | initializing Y       |    > scroll-back area
 *                         | initializing Z       |   |
 *                         |                      |  /
 * vc_visible_origin ---> ^+----------------------+-:
 * (changes by scroll)    || Welcome to linux     |  \
 *                        ||                      |   |
 *           vc_rows --->< | login: root          |   |  visible on console
 *                        || password:            |    > (vc_screenbuf_size is
 * vc_origin -----------> ||                      |   |   vc_size_row * vc_rows)
 * (start when no scroll) || Last login: 12:28    |  /
 *                        v+----------------------+-:
 *                         | Have a lot of fun... |  \
 * vc_pos -----------------|--------v             |   > scroll-front area
 *                         | ~ # cat_             |  /
 * vc_scr_end -----------> +----------------------+-:
 * (vc_origin +            |                      |  \ EMPTY, to be filled by
 *  vc_screenbuf_size)     |                      |  / vc_video_erase_char
 *                         +----------------------+-'
 *                         <---- 2 * vc_cols ----->
 *                         <---- vc_size_row ----->
 *
 * Note that every character in the console buffer is accompanied with an
 * attribute in the buffer right after the character. This is not depicted
 * in the figure.
 */
struct vc_data {
	struct tty_port port;			/* Upper level data */

	struct vc_state state, saved_state;

	unsigned short	vc_num;			/* Console number */
	unsigned int	vc_cols;		/* [#] Console size */
	unsigned int	vc_rows;
	unsigned int	vc_size_row;		/* Bytes per row */
	unsigned int	vc_scan_lines;		/* # of scan lines */
	unsigned int	vc_cell_height;		/* CRTC character cell height */
	unsigned long	vc_origin;		/* [!] Start of real screen */
	unsigned long	vc_scr_end;		/* [!] End of real screen */
	unsigned long	vc_visible_origin;	/* [!] Top of visible window */
	unsigned int	vc_top, vc_bottom;	/* Scrolling region */
	const struct consw *vc_sw;
	unsigned short	*vc_screenbuf;		/* In-memory character/attribute buffer */
	unsigned int	vc_screenbuf_size;
	unsigned char	vc_mode;		/* KD_TEXT, ... */
	/* attributes for all characters on screen */
	unsigned char	vc_attr;		/* Current attributes */
	unsigned char	vc_def_color;		/* Default colors */
	unsigned char	vc_ulcolor;		/* Color for underline mode */
	u