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TOMOYO Linux Cross Reference
Linux/include/linux/console_struct.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * console_struct.h
  4  *
  5  * Data structure describing single virtual console except for data
  6  * used by vt.c.
  7  *
  8  * Fields marked with [#] must be set by the low-level driver.
  9  * Fields marked with [!] can be changed by the low-level driver
 10  * to achieve effects such as fast scrolling by changing the origin.
 11  */
 12 
 13 #ifndef _LINUX_CONSOLE_STRUCT_H
 14 #define _LINUX_CONSOLE_STRUCT_H
 15 
 16 #include <linux/wait.h>
 17 #include <linux/vt.h>
 18 #include <linux/workqueue.h>
 19 
 20 struct vt_struct;
 21 struct uni_pagedir;
 22 
 23 #define NPAR 16
 24 
 25 /*
 26  * Example: vc_data of a console that was scrolled 3 lines down.
 27  *
 28  *                              Console buffer
 29  * vc_screenbuf ---------> +----------------------+-.
 30  *                         | initializing W       |  \
 31  *                         | initializing X       |   |
 32  *                         | initializing Y       |    > scroll-back area
 33  *                         | initializing Z       |   |
 34  *                         |                      |  /
 35  * vc_visible_origin ---> ^+----------------------+-:
 36  * (changes by scroll)    || Welcome to linux     |  \
 37  *                        ||                      |   |
 38  *           vc_rows --->< | login: root          |   |  visible on console
 39  *                        || password:            |    > (vc_screenbuf_size is
 40  * vc_origin -----------> ||                      |   |   vc_size_row * vc_rows)
 41  * (start when no scroll) || Last login: 12:28    |  /
 42  *                        v+----------------------+-:
 43  *                         | Have a lot of fun... |  \
 44  * vc_pos -----------------|--------v             |   > scroll-front area
 45  *                         | ~ # cat_             |  /
 46  * vc_scr_end -----------> +----------------------+-:
 47  * (vc_origin +            |                      |  \ EMPTY, to be filled by
 48  *  vc_screenbuf_size)     |                      |  / vc_video_erase_char
 49  *                         +----------------------+-'
 50  *                         <---- 2 * vc_cols ----->
 51  *                         <---- vc_size_row ----->
 52  *
 53  * Note that every character in the console buffer is accompanied with an
 54  * attribute in the buffer right after the character. This is not depicted
 55  * in the figure.
 56  */
 57 struct vc_data {
 58         struct tty_port port;                   /* Upper level data */
 59 
 60         unsigned short  vc_num;                 /* Console number */
 61         unsigned int    vc_cols;                /* [#] Console size */
 62         unsigned int    vc_rows;
 63         unsigned int    vc_size_row;            /* Bytes per row */
 64         unsigned int    vc_scan_lines;          /* # of scan lines */
 65         unsigned long   vc_origin;              /* [!] Start of real screen */
 66         unsigned long   vc_scr_end;             /* [!] End of real screen */
 67         unsigned long   vc_visible_origin;      /* [!] Top of visible window */
 68         unsigned int    vc_top, vc_bottom;      /* Scrolling region */
 69         const struct consw *vc_sw;
 70         unsigned short  *vc_screenbuf;          /* In-memory character/attribute buffer */
 71         unsigned int    vc_screenbuf_size;
 72         unsigned char   vc_mode;                /* KD_TEXT, ... */
 73         /* attributes for all characters on screen */
 74         unsigned char   vc_attr;                /* Current attributes */
 75         unsigned char   vc_def_color;           /* Default colors */
 76         unsigned char   vc_color;               /* Foreground & background */
 77         unsigned char   vc_s_color;             /* Saved foreground & background */
 78         unsigned char   vc_ulcolor;             /* Color for underline mode */
 79         unsigned char   vc_itcolor;
 80         unsigned char   vc_halfcolor;           /* Color for half intensity mode */
 81         /* cursor */
 82         unsigned int    vc_cursor_type;
 83         unsigned short  vc_complement_mask;     /* [#] Xor mask for mouse pointer */
 84         unsigned short  vc_s_complement_mask;   /* Saved mouse pointer mask */
 85         unsigned int    vc_x, vc_y;             /* Cursor position */
 86         unsigned int    vc_saved_x, vc_saved_y;
 87         unsigned long   vc_pos;                 /* Cursor address */
 88         /* fonts */     
 89         unsigned short  vc_hi_font_mask;        /* [#] Attribute set for upper 256 chars of font or 0 if not supported */
 90         struct console_font vc_font;            /* Current VC font set */
 91         unsigned short  vc_video_erase_char;    /* Background erase character */
 92         /* VT terminal data */
 93         unsigned int    vc_state;               /* Escape sequence parser state */
 94         unsigned int    vc_npar,vc_par[NPAR];   /* Parameters of current escape sequence */
 95         /* data for manual vt switching */
 96         struct vt_mode  vt_mode;
 97         struct pid      *vt_pid;
 98         int             vt_newvt;
 99         wait_queue_head_t paste_wait;
100         /* mode flags */
101         unsigned int    vc_charset      : 1;    /* Character set G0 / G1 */
102         unsigned int    vc_s_charset    : 1;    /* Saved character set */
103         unsigned int    vc_disp_ctrl    : 1;    /* Display chars < 32? */
104         unsigned int    vc_toggle_meta  : 1;    /* Toggle high bit? */
105         unsigned int    vc_decscnm      : 1;    /* Screen Mode */
106         unsigned int    vc_decom        : 1;    /* Origin Mode */
107         unsigned int    vc_decawm       : 1;    /* Autowrap Mode */
108         unsigned int    vc_deccm        : 1;    /* Cursor Visible */
109         unsigned int    vc_decim        : 1;    /* Insert Mode */
110         /* attribute flags */
111         unsigned int    vc_intensity    : 2;    /* 0=half-bright, 1=normal, 2=bold */
112         unsigned int    vc_italic:1;
113         unsigned int    vc_underline    : 1;
114         unsigned int    vc_blink        : 1;
115         unsigned int    vc_reverse      : 1;
116         unsigned int    vc_s_intensity  : 2;    /* saved rendition */
117         unsigned int    vc_s_italic:1;
118         unsigned int    vc_s_underline  : 1;
119         unsigned int    vc_s_blink      : 1;
120         unsigned int    vc_s_reverse    : 1;
121         /* misc */
122         unsigned int    vc_ques         : 1;
123         unsigned int    vc_need_wrap    : 1;
124         unsigned int    vc_can_do_color : 1;
125         unsigned int    vc_report_mouse : 2;
126         unsigned char   vc_utf          : 1;    /* Unicode UTF-8 encoding */
127         unsigned char   vc_utf_count;
128                  int    vc_utf_char;
129         unsigned int    vc_tab_stop[8];         /* Tab stops. 256 columns. */
130         unsigned char   vc_palette[16*3];       /* Colour palette for VGA+ */
131         unsigned short * vc_translate;
132         unsigned char   vc_G0_charset;
133         unsigned char   vc_G1_charset;
134         unsigned char   vc_saved_G0;
135         unsigned char   vc_saved_G1;
136         unsigned int    vc_resize_user;         /* resize request from user */
137         unsigned int    vc_bell_pitch;          /* Console bell pitch */
138         unsigned int    vc_bell_duration;       /* Console bell duration */
139         unsigned short  vc_cur_blink_ms;        /* Cursor blink duration */
140         struct vc_data **vc_display_fg;         /* [!] Ptr to var holding fg console for this display */
141         struct uni_pagedir *vc_uni_pagedir;
142         struct uni_pagedir **vc_uni_pagedir_loc; /* [!] Location of uni_pagedir variable for this console */
143         bool vc_panic_force_write; /* when oops/panic this VC can accept forced output/blanking */
144         /* additional information is in vt_kern.h */
145 };
146 
147 struct vc {
148         struct vc_data *d;
149         struct work_struct SAK_work;
150 
151         /* might add  scrmem, vt_struct, kbd  at some time,
152            to have everything in one place - the disadvantage
153            would be that vc_cons etc can no longer be static */
154 };
155 
156 extern struct vc vc_cons [MAX_NR_CONSOLES];
157 extern void vc_SAK(struct work_struct *work);
158 
159 #define CUR_DEF         0
160 #define CUR_NONE        1
161 #define CUR_UNDERLINE   2
162 #define CUR_LOWER_THIRD 3
163 #define CUR_LOWER_HALF  4
164 #define CUR_TWO_THIRDS  5
165 #define CUR_BLOCK       6
166 #define CUR_HWMASK      0x0f
167 #define CUR_SWMASK      0xfff0
168 
169 #define CUR_DEFAULT CUR_UNDERLINE
170 
171 static inline bool con_is_visible(const struct vc_data *vc)
172 {
173         return *vc->vc_display_fg == vc;
174 }
175 
176 #endif /* _LINUX_CONSOLE_STRUCT_H */
177 

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