198 lines
7.1 KiB
C
198 lines
7.1 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* console_struct.h
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*
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* Data structure describing single virtual console except for data
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* used by vt.c.
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*
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* Fields marked with [#] must be set by the low-level driver.
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* Fields marked with [!] can be changed by the low-level driver
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* to achieve effects such as fast scrolling by changing the origin.
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*/
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#ifndef _LINUX_CONSOLE_STRUCT_H
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#define _LINUX_CONSOLE_STRUCT_H
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#include <linux/wait.h>
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#include <linux/vt.h>
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#include <linux/workqueue.h>
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struct uni_pagedict;
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struct uni_screen;
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#define NPAR 16
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#define VC_TABSTOPS_COUNT 256U
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enum vc_intensity {
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VCI_HALF_BRIGHT,
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VCI_NORMAL,
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VCI_BOLD,
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VCI_MASK = 0x3,
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};
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/**
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* struct vc_state -- state of a VC
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* @x: cursor's x-position
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* @y: cursor's y-position
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* @color: foreground & background colors
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* @Gx_charset: what's G0/G1 slot set to (like GRAF_MAP, LAT1_MAP)
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* @charset: what character set to use (0=G0 or 1=G1)
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* @intensity: see enum vc_intensity for values
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* @reverse: reversed foreground/background colors
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*
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* These members are defined separately from struct vc_data as we save &
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* restore them at times.
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*/
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struct vc_state {
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unsigned int x, y;
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unsigned char color;
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unsigned char Gx_charset[2];
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unsigned int charset : 1;
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/* attribute flags */
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enum vc_intensity intensity;
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bool italic;
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bool underline;
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bool blink;
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bool reverse;
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};
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/*
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* Example: vc_data of a console that was scrolled 3 lines down.
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*
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* Console buffer
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* vc_screenbuf ---------> +----------------------+-.
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* | initializing W | \
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* | initializing X | |
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* | initializing Y | > scroll-back area
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* | initializing Z | |
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* | | /
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* vc_visible_origin ---> ^+----------------------+-:
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* (changes by scroll) || Welcome to linux | \
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* || | |
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* vc_rows --->< | login: root | | visible on console
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* || password: | > (vc_screenbuf_size is
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* vc_origin -----------> || | | vc_size_row * vc_rows)
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* (start when no scroll) || Last login: 12:28 | /
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* v+----------------------+-:
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* | Have a lot of fun... | \
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* vc_pos -----------------|--------v | > scroll-front area
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* | ~ # cat_ | /
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* vc_scr_end -----------> +----------------------+-:
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* (vc_origin + | | \ EMPTY, to be filled by
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* vc_screenbuf_size) | | / vc_video_erase_char
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* +----------------------+-'
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* <---- 2 * vc_cols ----->
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* <---- vc_size_row ----->
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*
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* Note that every character in the console buffer is accompanied with an
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* attribute in the buffer right after the character. This is not depicted
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* in the figure.
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*/
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struct vc_data {
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struct tty_port port; /* Upper level data */
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struct vc_state state, saved_state;
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unsigned short vc_num; /* Console number */
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unsigned int vc_cols; /* [#] Console size */
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unsigned int vc_rows;
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unsigned int vc_size_row; /* Bytes per row */
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unsigned int vc_scan_lines; /* # of scan lines */
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unsigned int vc_cell_height; /* CRTC character cell height */
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unsigned long vc_origin; /* [!] Start of real screen */
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unsigned long vc_scr_end; /* [!] End of real screen */
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unsigned long vc_visible_origin; /* [!] Top of visible window */
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unsigned int vc_top, vc_bottom; /* Scrolling region */
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const struct consw *vc_sw;
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unsigned short *vc_screenbuf; /* In-memory character/attribute buffer */
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unsigned int vc_screenbuf_size;
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unsigned char vc_mode; /* KD_TEXT, ... */
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/* attributes for all characters on screen */
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unsigned char vc_attr; /* Current attributes */
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unsigned char vc_def_color; /* Default colors */
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unsigned char vc_ulcolor; /* Color for underline mode */
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unsigned char vc_itcolor;
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unsigned char vc_halfcolor; /* Color for half intensity mode */
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/* cursor */
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unsigned int vc_cursor_type;
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unsigned short vc_complement_mask; /* [#] Xor mask for mouse pointer */
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unsigned short vc_s_complement_mask; /* Saved mouse pointer mask */
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unsigned long vc_pos; /* Cursor address */
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/* fonts */
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unsigned short vc_hi_font_mask; /* [#] Attribute set for upper 256 chars of font or 0 if not supported */
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struct console_font vc_font; /* Current VC font set */
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unsigned short vc_video_erase_char; /* Background erase character */
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/* VT terminal data */
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unsigned int vc_state; /* Escape sequence parser state */
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unsigned int vc_npar,vc_par[NPAR]; /* Parameters of current escape sequence */
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/* data for manual vt switching */
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struct vt_mode vt_mode;
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struct pid *vt_pid;
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int vt_newvt;
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wait_queue_head_t paste_wait;
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/* mode flags */
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unsigned int vc_disp_ctrl : 1; /* Display chars < 32? */
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unsigned int vc_toggle_meta : 1; /* Toggle high bit? */
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unsigned int vc_decscnm : 1; /* Screen Mode */
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unsigned int vc_decom : 1; /* Origin Mode */
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unsigned int vc_decawm : 1; /* Autowrap Mode */
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unsigned int vc_deccm : 1; /* Cursor Visible */
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unsigned int vc_decim : 1; /* Insert Mode */
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/* misc */
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unsigned int vc_priv : 3;
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unsigned int vc_need_wrap : 1;
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unsigned int vc_can_do_color : 1;
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unsigned int vc_report_mouse : 2;
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unsigned char vc_utf : 1; /* Unicode UTF-8 encoding */
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unsigned char vc_utf_count;
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int vc_utf_char;
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DECLARE_BITMAP(vc_tab_stop, VC_TABSTOPS_COUNT); /* Tab stops. 256 columns. */
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unsigned char vc_palette[16*3]; /* Colour palette for VGA+ */
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unsigned short * vc_translate;
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unsigned int vc_resize_user; /* resize request from user */
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unsigned int vc_bell_pitch; /* Console bell pitch */
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unsigned int vc_bell_duration; /* Console bell duration */
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unsigned short vc_cur_blink_ms; /* Cursor blink duration */
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struct vc_data **vc_display_fg; /* [!] Ptr to var holding fg console for this display */
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struct uni_pagedict *uni_pagedict;
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struct uni_pagedict **uni_pagedict_loc; /* [!] Location of uni_pagedict variable for this console */
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struct uni_screen *vc_uni_screen; /* unicode screen content */
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/* additional information is in vt_kern.h */
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};
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struct vc {
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struct vc_data *d;
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struct work_struct SAK_work;
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/* might add scrmem, kbd at some time,
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to have everything in one place */
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};
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extern struct vc vc_cons [MAX_NR_CONSOLES];
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extern void vc_SAK(struct work_struct *work);
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#define CUR_MAKE(size, change, set) ((size) | ((change) << 8) | \
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((set) << 16))
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#define CUR_SIZE(c) ((c) & 0x00000f)
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# define CUR_DEF 0
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# define CUR_NONE 1
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# define CUR_UNDERLINE 2
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# define CUR_LOWER_THIRD 3
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# define CUR_LOWER_HALF 4
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# define CUR_TWO_THIRDS 5
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# define CUR_BLOCK 6
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#define CUR_SW 0x000010
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#define CUR_ALWAYS_BG 0x000020
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#define CUR_INVERT_FG_BG 0x000040
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#define CUR_FG 0x000700
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#define CUR_BG 0x007000
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#define CUR_CHANGE(c) ((c) & 0x00ff00)
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#define CUR_SET(c) (((c) & 0xff0000) >> 8)
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bool con_is_visible(const struct vc_data *vc);
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#endif /* _LINUX_CONSOLE_STRUCT_H */
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