include/linux/console_struct.h

   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 uni_pagedict;
  21
  22 #define NPAR 16
  23 #define VC_TABSTOPS_COUNT       256U
  24
  25 enum vc_intensity {
  26         VCI_HALF_BRIGHT,
  27         VCI_NORMAL,
  28         VCI_BOLD,
  29         VCI_MASK = 0x3,
  30 };
  31
  32 /**
  33  * struct vc_state -- state of a VC
  34  * @x: cursor's x-position
  35  * @y: cursor's y-position
  36  * @color: foreground & background colors
  37  * @Gx_charset: what's G0/G1 slot set to (like GRAF_MAP, LAT1_MAP)
  38  * @charset: what character set to use (0=G0 or 1=G1)
  39  * @intensity: see enum vc_intensity for values
  40  * @reverse: reversed foreground/background colors
  41  *
  42  * These members are defined separately from struct vc_data as we save &
  43  * restore them at times.
  44  */
  45 struct vc_state {
  46         unsigned int    x, y;
  47
  48         unsigned char   color;
  49
  50         unsigned char   Gx_charset[2];
  51         unsigned int    charset         : 1;
  52
  53         /* attribute flags */
  54         enum vc_intensity intensity;
  55         bool            italic;
  56         bool            underline;
  57         bool            blink;
  58         bool            reverse;
  59 };
  60
  61 /*
  62  * Example: vc_data of a console that was scrolled 3 lines down.
  63  *
  64  *                              Console buffer
  65  * vc_screenbuf ---------> +----------------------+-.
  66  *                         | initializing W       |  \
  67  *                         | initializing X       |   |
  68  *                         | initializing Y       |    > scroll-back area
  69  *                         | initializing Z       |   |
  70  *                         |                      |  /
  71  * vc_visible_origin ---> ^+----------------------+-:
  72  * (changes by scroll)    || Welcome to linux     |  \
  73  *                        ||                      |   |
  74  *           vc_rows --->< | login: root          |   |  visible on console
  75  *                        || password:            |    > (vc_screenbuf_size is
  76  * vc_origin -----------> ||                      |   |   vc_size_row * vc_rows)
  77  * (start when no scroll) || Last login: 12:28    |  /
  78  *                        v+----------------------+-:
  79  *                         | Have a lot of fun... |  \
  80  * vc_pos -----------------|--------v             |   > scroll-front area
  81  *                         | ~ # cat_             |  /
  82  * vc_scr_end -----------> +----------------------+-:
  83  * (vc_origin +            |                      |  \ EMPTY, to be filled by
  84  *  vc_screenbuf_size)     |                      |  / vc_video_erase_char
  85  *                         +----------------------+-'
  86  *                         <---- 2 * vc_cols ----->
  87  *                         <---- vc_size_row ----->
  88  *
  89  * Note that every character in the console buffer is accompanied with an
  90  * attribute in the buffer right after the character. This is not depicted
  91  * in the figure.
  92  */
  93 struct vc_data {
  94         struct tty_port port;                   /* Upper level data */
  95
  96         struct vc_state state, saved_state;
  97
  98         unsigned short  vc_num;                 /* Console number */
  99         unsigned int    vc_cols;                /* [#] Console size */
 100         unsigned int    vc_rows;
 101         unsigned int    vc_size_row;            /* Bytes per row */
 102         unsigned int    vc_scan_lines;          /* # of scan lines */
 103         unsigned int    vc_cell_height;         /* CRTC character cell height */
 104         unsigned long   vc_origin;              /* [!] Start of real screen */
 105         unsigned long   vc_scr_end;             /* [!] End of real screen */
 106         unsigned long   vc_visible_origin;      /* [!] Top of visible window */
 107         unsigned int    vc_top, vc_bottom;      /* Scrolling region */
 108         const struct consw *vc_sw;
 109         unsigned short  *vc_screenbuf;          /* In-memory character/attribute buffer */
 110         unsigned int    vc_screenbuf_size;
 111         unsigned char   vc_mode;                /* KD_TEXT, ... */
 112         /* attributes for all characters on screen */
 113         unsigned char   vc_attr;                /* Current attributes */
 114         unsigned char   vc_def_color;           /* Default colors */
 115         unsigned char   vc_ulcolor;             /* Color for underline mode */
 116         unsigned char   vc_itcolor;
 117         unsigned char   vc_halfcolor;           /* Color for half intensity mode */
 118         /* cursor */
 119         unsigned int    vc_cursor_type;
 120         unsigned short  vc_complement_mask;     /* [#] Xor mask for mouse pointer */
 121         unsigned short  vc_s_complement_mask;   /* Saved mouse pointer mask */
 122         unsigned long   vc_pos;                 /* Cursor address */
 123         /* fonts */
 124         unsigned short  vc_hi_font_mask;        /* [#] Attribute set for upper 256 chars of font or 0 if not supported */
 125         struct console_font vc_font;            /* Current VC font set */
 126         unsigned short  vc_video_erase_char;    /* Background erase character */
 127         /* VT terminal data */
 128         unsigned int    vc_state;               /* Escape sequence parser state */
 129         unsigned int    vc_npar,vc_par[NPAR];   /* Parameters of current escape sequence */
 130         /* data for manual vt switching */
 131         struct vt_mode  vt_mode;
 132         struct pid      *vt_pid;
 133         int             vt_newvt;
 134         wait_queue_head_t paste_wait;
 135         /* mode flags */
 136         unsigned int    vc_disp_ctrl    : 1;    /* Display chars < 32? */
 137         unsigned int    vc_toggle_meta  : 1;    /* Toggle high bit? */
 138         unsigned int    vc_decscnm      : 1;    /* Screen Mode */
 139         unsigned int    vc_decom        : 1;    /* Origin Mode */
 140         unsigned int    vc_decawm       : 1;    /* Autowrap Mode */
 141         unsigned int    vc_deccm        : 1;    /* Cursor Visible */
 142         unsigned int    vc_decim        : 1;    /* Insert Mode */
 143         /* misc */
 144         unsigned int    vc_priv         : 3;
 145         unsigned int    vc_need_wrap    : 1;
 146         unsigned int    vc_can_do_color : 1;
 147         unsigned int    vc_report_mouse : 2;
 148         unsigned char   vc_utf          : 1;    /* Unicode UTF-8 encoding */
 149         unsigned char   vc_utf_count;
 150                  int    vc_utf_char;
 151         DECLARE_BITMAP(vc_tab_stop, VC_TABSTOPS_COUNT); /* Tab stops. 256 columns. */
 152         unsigned char   vc_palette[16*3];       /* Colour palette for VGA+ */
 153         unsigned short * vc_translate;
 154         unsigned int    vc_bell_pitch;          /* Console bell pitch */
 155         unsigned int    vc_bell_duration;       /* Console bell duration */
 156         unsigned short  vc_cur_blink_ms;        /* Cursor blink duration */
 157         struct vc_data **vc_display_fg;         /* [!] Ptr to var holding fg console for this display */
 158         struct uni_pagedict *uni_pagedict;
 159         struct uni_pagedict **uni_pagedict_loc; /* [!] Location of uni_pagedict variable for this console */
 160         u32 **vc_uni_lines;                     /* unicode screen content */
 161         /* additional information is in vt_kern.h */
 162 };
 163
 164 struct vc {
 165         struct vc_data *d;
 166         struct work_struct SAK_work;
 167
 168         /* might add  scrmem, kbd  at some time,
 169            to have everything in one place */
 170 };
 171
 172 extern struct vc vc_cons [MAX_NR_CONSOLES];
 173 extern void vc_SAK(struct work_struct *work);
 174
 175 #define CUR_MAKE(size, change, set)     ((size) | ((change) << 8) |     \
 176                 ((set) << 16))
 177 #define CUR_SIZE(c)              ((c) & 0x00000f)
 178 # define CUR_DEF                               0
 179 # define CUR_NONE                              1
 180 # define CUR_UNDERLINE                         2
 181 # define CUR_LOWER_THIRD                       3
 182 # define CUR_LOWER_HALF                        4
 183 # define CUR_TWO_THIRDS                        5
 184 # define CUR_BLOCK                             6
 185 #define CUR_SW                          0x000010
 186 #define CUR_ALWAYS_BG                   0x000020
 187 #define CUR_INVERT_FG_BG                0x000040
 188 #define CUR_FG                          0x000700
 189 #define CUR_BG                          0x007000
 190 #define CUR_CHANGE(c)            ((c) & 0x00ff00)
 191 #define CUR_SET(c)              (((c) & 0xff0000) >> 8)
 192
 193 bool con_is_visible(const struct vc_data *vc);
 194
 195 #endif /* _LINUX_CONSOLE_STRUCT_H */