Quelle console_struct.h Sprache: C

/* 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 */
unsigned char   vc_itcolor;
unsigned char vc_halfcolor;  /* Color for half intensity mode */
/* cursor */
unsigned int vc_cursor_type;
unsigned short vc_complement_mask; /* [#] Xor mask for mouse pointer */
unsigned short vc_s_complement_mask; /* Saved mouse pointer mask */
unsigned long vc_pos;   /* Cursor address */
/* fonts */
unsigned short vc_hi_font_mask; /* [#] Attribute set for upper 256 chars of font or 0 if not supported */
struct console_font vc_font;  /* Current VC font set */
unsigned short vc_video_erase_char; /* Background erase character */
/* VT terminal data */
unsigned int vc_state;  /* Escape sequence parser state */
unsigned int vc_npar,vc_par[NPAR]; /* Parameters of current escape sequence */
/* data for manual vt switching */
struct vt_mode vt_mode;
struct pid  *vt_pid;
int  vt_newvt;
wait_queue_head_t paste_wait;
/* mode flags */
unsigned int vc_disp_ctrl : 1; /* Display chars < 32? */
unsigned int vc_toggle_meta : 1; /* Toggle high bit? */
unsigned int vc_decscnm : 1; /* Screen Mode */
unsigned int vc_decom : 1; /* Origin Mode */
unsigned int vc_decawm : 1; /* Autowrap Mode */
unsigned int vc_deccm : 1; /* Cursor Visible */
unsigned int vc_decim : 1; /* Insert Mode */
/* misc */
unsigned int vc_priv  : 3;
unsigned int vc_need_wrap : 1;
unsigned int vc_can_do_color : 1;
unsigned int vc_report_mouse : 2;
unsigned int vc_bracketed_paste : 1;
unsigned char vc_utf  : 1; /* Unicode UTF-8 encoding */
unsigned char vc_utf_count;
   int vc_utf_char;
DECLARE_BITMAP(vc_tab_stop, VC_TABSTOPS_COUNT); /* Tab stops. 256 columns. */
unsigned char   vc_palette[16*3];       /* Colour palette for VGA+ */
unsigned short * vc_translate;
unsigned int vc_bell_pitch;  /* Console bell pitch */
unsigned int vc_bell_duration; /* Console bell duration */
unsigned short vc_cur_blink_ms; /* Cursor blink duration */
struct vc_data **vc_display_fg;  /* [!] Ptr to var holding fg console for this display */
struct uni_pagedict *uni_pagedict;
struct uni_pagedict **uni_pagedict_loc; /* [!] Location of uni_pagedict variable for this console */
u32 **vc_uni_lines;   /* unicode screen content */
/* additional information is in vt_kern.h */
};

struct vc {
struct vc_data *d;
struct work_struct SAK_work;

/* might add  scrmem, kbd  at some time,
   to have everything in one place */
};

extern struct vc vc_cons [MAX_NR_CONSOLES];
extern void vc_SAK(struct work_struct *work);

#define CUR_MAKE(size, change, set) ((size) | ((change) << 8) | \
  ((set) << 16))
#define CUR_SIZE(c)   ((c) & 0x00000f)
# define CUR_DEF          0
# define CUR_NONE          1
# define CUR_UNDERLINE          2
# define CUR_LOWER_THIRD         3
# define CUR_LOWER_HALF          4
# define CUR_TWO_THIRDS          5
# define CUR_BLOCK          6
#define CUR_SW    0x000010
#define CUR_ALWAYS_BG   0x000020
#define CUR_INVERT_FG_BG  0x000040
#define CUR_FG    0x000700
#define CUR_BG    0x007000
#define CUR_CHANGE(c)   ((c) & 0x00ff00)
#define CUR_SET(c)  (((c) & 0xff0000) >> 8)

bool con_is_visible(const struct vc_data *vc);

#endif /* _LINUX_CONSOLE_STRUCT_H */

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