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dbee4cffa1
vc_tab_stop is used as a bitmap, but defined as an unsigned int array. Switch it to bitmap and convert all users to the bitmap interface. Note the difference in behavior! We no longer mask the top 24 bits away from x, hence we do not wrap tabs at 256th column. Instead, we silently drop attempts to set a tab behind 256 columns. And we will also seek by '\t' to the rightmost column, when behind that boundary. I do not think the original behavior was desired and that someone relies on that. If this turns out to be the case, we can change the added 'if's back to masks here and there instead... (Or we can increase the limit as fb consoles now have 240 chars here. And they could have more with higher than my resolution, of course.) Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20200615074910.19267-6-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
191 lines
6.8 KiB
C
191 lines
6.8 KiB
C
/* 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_pagedir;
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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 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_pagedir *vc_uni_pagedir;
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struct uni_pagedir **vc_uni_pagedir_loc; /* [!] Location of uni_pagedir 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 - the disadvantage
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would be that vc_cons etc can no longer be static */
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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_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_HWMASK 0x0f
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#define CUR_SWMASK 0xfff0
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#define CUR_DEFAULT CUR_UNDERLINE
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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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