drivers/video/console/fbcon.h

   1 /*
   2  *  linux/drivers/video/console/fbcon.h -- Low level frame buffer based console driver
   3  *
   4  *      Copyright (C) 1997 Geert Uytterhoeven
   5  *
   6  *  This file is subject to the terms and conditions of the GNU General Public
   7  *  License.  See the file COPYING in the main directory of this archive
   8  *  for more details.
   9  */
  10
  11 #ifndef _VIDEO_FBCON_H
  12 #define _VIDEO_FBCON_H
  13
  14 #include <linux/types.h>
  15 #include <linux/vt_buffer.h>
  16 #include <linux/vt_kern.h>
  17
  18 #include <asm/io.h>
  19
  20 #define FBCON_FLAGS_INIT         1
  21 #define FBCON_FLAGS_CURSOR_TIMER 2
  22
  23    /*
  24     *    This is the interface between the low-level console driver and the
  25     *    low-level frame buffer device
  26     */
  27
  28 struct display {
  29     /* Filled in by the low-level console driver */
  30     const u_char *fontdata;
  31     int userfont;                   /* != 0 if fontdata kmalloc()ed */
  32     u_short scrollmode;             /* Scroll Method */
  33     u_short inverse;                /* != 0 text black on white as default */
  34     short yscroll;                  /* Hardware scrolling */
  35     int vrows;                      /* number of virtual rows */
  36     int cursor_shape;
  37     int con_rotate;
  38     u32 xres_virtual;
  39     u32 yres_virtual;
  40     u32 height;
  41     u32 width;
  42     u32 bits_per_pixel;
  43     u32 grayscale;
  44     u32 nonstd;
  45     u32 accel_flags;
  46     u32 rotate;
  47     struct fb_bitfield red;
  48     struct fb_bitfield green;
  49     struct fb_bitfield blue;
  50     struct fb_bitfield transp;
  51     const struct fb_videomode *mode;
  52 };
  53
  54 struct fbcon_ops {
  55         void (*bmove)(struct vc_data *vc, struct fb_info *info, int sy,
  56                       int sx, int dy, int dx, int height, int width);
  57         void (*clear)(struct vc_data *vc, struct fb_info *info, int sy,
  58                       int sx, int height, int width);
  59         void (*putcs)(struct vc_data *vc, struct fb_info *info,
  60                       const unsigned short *s, int count, int yy, int xx,
  61                       int fg, int bg);
  62         void (*clear_margins)(struct vc_data *vc, struct fb_info *info,
  63                               int bottom_only);
  64         void (*cursor)(struct vc_data *vc, struct fb_info *info, int mode,
  65                        int softback_lines, int fg, int bg);
  66         int  (*update_start)(struct fb_info *info);
  67         int  (*rotate_font)(struct fb_info *info, struct vc_data *vc);
  68         struct fb_var_screeninfo var;  /* copy of the current fb_var_screeninfo */
  69         struct timer_list cursor_timer; /* Cursor timer */
  70         struct fb_cursor cursor_state;
  71         struct display *p;
  72         int    currcon;                 /* Current VC. */
  73         int    cursor_flash;
  74         int    cursor_reset;
  75         int    blank_state;
  76         int    graphics;
  77         int    flags;
  78         int    rotate;
  79         int    cur_rotate;
  80         char  *cursor_data;
  81         u8    *fontbuffer;
  82         u8    *fontdata;
  83         u8    *cursor_src;
  84         u32    cursor_size;
  85         u32    fd_size;
  86 };
  87     /*
  88      *  Attribute Decoding
  89      */
  90
  91 /* Color */
  92 #define attr_fgcol(fgshift,s)    \
  93         (((s) >> (fgshift)) & 0x0f)
  94 #define attr_bgcol(bgshift,s)    \
  95         (((s) >> (bgshift)) & 0x0f)
  96
  97 /* Monochrome */
  98 #define attr_bold(s) \
  99         ((s) & 0x200)
 100 #define attr_reverse(s) \
 101         ((s) & 0x800)
 102 #define attr_underline(s) \
 103         ((s) & 0x400)
 104 #define attr_blink(s) \
 105         ((s) & 0x8000)
 106
 107
 108 static inline int mono_col(const struct fb_info *info)
 109 {
 110         __u32 max_len;
 111         max_len = max(info->var.green.length, info->var.red.length);
 112         max_len = max(info->var.blue.length, max_len);
 113         return (~(0xfff << max_len)) & 0xff;
 114 }
 115
 116 static inline int attr_col_ec(int shift, struct vc_data *vc,
 117                               struct fb_info *info, int is_fg)
 118 {
 119         int is_mono01;
 120         int col;
 121         int fg;
 122         int bg;
 123
 124         if (!vc)
 125                 return 0;
 126
 127         if (vc->vc_can_do_color)
 128                 return is_fg ? attr_fgcol(shift,vc->vc_video_erase_char)
 129                         : attr_bgcol(shift,vc->vc_video_erase_char);
 130
 131         if (!info)
 132                 return 0;
 133
 134         col = mono_col(info);
 135         is_mono01 = info->fix.visual == FB_VISUAL_MONO01;
 136
 137         if (attr_reverse(vc->vc_video_erase_char)) {
 138                 fg = is_mono01 ? col : 0;
 139                 bg = is_mono01 ? 0 : col;
 140         }
 141         else {
 142                 fg = is_mono01 ? 0 : col;
 143                 bg = is_mono01 ? col : 0;
 144         }
 145
 146         return is_fg ? fg : bg;
 147 }
 148
 149 #define attr_bgcol_ec(bgshift, vc, info) attr_col_ec(bgshift, vc, info, 0)
 150 #define attr_fgcol_ec(fgshift, vc, info) attr_col_ec(fgshift, vc, info, 1)
 151
 152 /* Font */
 153 #define REFCOUNT(fd)    (((int *)(fd))[-1])
 154 #define FNTSIZE(fd)     (((int *)(fd))[-2])
 155 #define FNTCHARCNT(fd)  (((int *)(fd))[-3])
 156 #define FNTSUM(fd)      (((int *)(fd))[-4])
 157 #define FONT_EXTRA_WORDS 4
 158
 159     /*
 160      *  Scroll Method
 161      */
 162
 163 /* There are several methods fbcon can use to move text around the screen:
 164  *
 165  *                     Operation   Pan    Wrap
 166  *---------------------------------------------
 167  * SCROLL_MOVE         copyarea    No     No
 168  * SCROLL_PAN_MOVE     copyarea    Yes    No
 169  * SCROLL_WRAP_MOVE    copyarea    No     Yes
 170  * SCROLL_REDRAW       imageblit   No     No
 171  * SCROLL_PAN_REDRAW   imageblit   Yes    No
 172  * SCROLL_WRAP_REDRAW  imageblit   No     Yes
 173  *
 174  * (SCROLL_WRAP_REDRAW is not implemented yet)
 175  *
 176  * In general, fbcon will choose the best scrolling
 177  * method based on the rule below:
 178  *
 179  * Pan/Wrap > accel imageblit > accel copyarea >
 180  * soft imageblit > (soft copyarea)
 181  *
 182  * Exception to the rule: Pan + accel copyarea is
 183  * preferred over Pan + accel imageblit.
 184  *
 185  * The above is typical for PCI/AGP cards. Unless
 186  * overridden, fbcon will never use soft copyarea.
 187  *
 188  * If you need to override the above rule, set the
 189  * appropriate flags in fb_info->flags.  For example,
 190  * to prefer copyarea over imageblit, set
 191  * FBINFO_READS_FAST.
 192  *
 193  * Other notes:
 194  * + use the hardware engine to move the text
 195  *    (hw-accelerated copyarea() and fillrect())
 196  * + use hardware-supported panning on a large virtual screen
 197  * + amifb can not only pan, but also wrap the display by N lines
 198  *    (i.e. visible line i = physical line (i+N) % yres).
 199  * + read what's already rendered on the screen and
 200  *     write it in a different place (this is cfb_copyarea())
 201  * + re-render the text to the screen
 202  *
 203  * Whether to use wrapping or panning can only be figured out at
 204  * runtime (when we know whether our font height is a multiple
 205  * of the pan/wrap step)
 206  *
 207  */
 208
 209 #define SCROLL_MOVE        0x001
 210 #define SCROLL_PAN_MOVE    0x002
 211 #define SCROLL_WRAP_MOVE   0x003
 212 #define SCROLL_REDRAW      0x004
 213 #define SCROLL_PAN_REDRAW  0x005
 214
 215 #ifdef CONFIG_FB_TILEBLITTING
 216 extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info);
 217 #endif
 218 extern void fbcon_set_bitops(struct fbcon_ops *ops);
 219 extern int  soft_cursor(struct fb_info *info, struct fb_cursor *cursor);
 220
 221 #define FBCON_ATTRIBUTE_UNDERLINE 1
 222 #define FBCON_ATTRIBUTE_REVERSE   2
 223 #define FBCON_ATTRIBUTE_BOLD      4
 224
 225 static inline int real_y(struct display *p, int ypos)
 226 {
 227         int rows = p->vrows;
 228
 229         ypos += p->yscroll;
 230         return ypos < rows ? ypos : ypos - rows;
 231 }
 232
 233
 234 static inline int get_attribute(struct fb_info *info, u16 c)
 235 {
 236         int attribute = 0;
 237
 238         if (fb_get_color_depth(&info->var, &info->fix) == 1) {
 239                 if (attr_underline(c))
 240                         attribute |= FBCON_ATTRIBUTE_UNDERLINE;
 241                 if (attr_reverse(c))
 242                         attribute |= FBCON_ATTRIBUTE_REVERSE;
 243                 if (attr_bold(c))
 244                         attribute |= FBCON_ATTRIBUTE_BOLD;
 245         }
 246
 247         return attribute;
 248 }
 249
 250 #define FBCON_SWAP(i,r,v) ({ \
 251         typeof(r) _r = (r);  \
 252         typeof(v) _v = (v);  \
 253         (void) (&_r == &_v); \
 254         (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; })
 255
 256 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
 257 extern void fbcon_set_rotate(struct fbcon_ops *ops);
 258 #else
 259 #define fbcon_set_rotate(x) do {} while(0)
 260 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 261
 262 #endif /* _VIDEO_FBCON_H */
 263