drivers/video/fbdev/core/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 fbcon_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 color, int bottom_only);
  64         void (*cursor)(struct vc_data *vc, struct fb_info *info, int mode,
  65                        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 fbcon_display *p;
  72         struct fb_info *info;
  73         int    currcon;                 /* Current VC. */
  74         int    cur_blink_jiffies;
  75         int    cursor_flash;
  76         int    cursor_reset;
  77         int    blank_state;
  78         int    graphics;
  79         int    save_graphics; /* for debug enter/leave */
  80         int    flags;
  81         int    rotate;
  82         int    cur_rotate;
  83         char  *cursor_data;
  84         u8    *fontbuffer;
  85         u8    *fontdata;
  86         u8    *cursor_src;
  87         u32    cursor_size;
  88         u32    fd_size;
  89 };
  90     /*
  91      *  Attribute Decoding
  92      */
  93
  94 /* Color */
  95 #define attr_fgcol(fgshift,s)    \
  96         (((s) >> (fgshift)) & 0x0f)
  97 #define attr_bgcol(bgshift,s)    \
  98         (((s) >> (bgshift)) & 0x0f)
  99
 100 /* Monochrome */
 101 #define attr_bold(s) \
 102         ((s) & 0x200)
 103 #define attr_reverse(s) \
 104         ((s) & 0x800)
 105 #define attr_underline(s) \
 106         ((s) & 0x400)
 107 #define attr_blink(s) \
 108         ((s) & 0x8000)
 109
 110
 111 static inline int mono_col(const struct fb_info *info)
 112 {
 113         __u32 max_len;
 114         max_len = max(info->var.green.length, info->var.red.length);
 115         max_len = max(info->var.blue.length, max_len);
 116         return (~(0xfff << max_len)) & 0xff;
 117 }
 118
 119 static inline int attr_col_ec(int shift, struct vc_data *vc,
 120                               struct fb_info *info, int is_fg)
 121 {
 122         int is_mono01;
 123         int col;
 124         int fg;
 125         int bg;
 126
 127         if (!vc)
 128                 return 0;
 129
 130         if (vc->vc_can_do_color)
 131                 return is_fg ? attr_fgcol(shift,vc->vc_video_erase_char)
 132                         : attr_bgcol(shift,vc->vc_video_erase_char);
 133
 134         if (!info)
 135                 return 0;
 136
 137         col = mono_col(info);
 138         is_mono01 = info->fix.visual == FB_VISUAL_MONO01;
 139
 140         if (attr_reverse(vc->vc_video_erase_char)) {
 141                 fg = is_mono01 ? col : 0;
 142                 bg = is_mono01 ? 0 : col;
 143         }
 144         else {
 145                 fg = is_mono01 ? 0 : col;
 146                 bg = is_mono01 ? col : 0;
 147         }
 148
 149         return is_fg ? fg : bg;
 150 }
 151
 152 #define attr_bgcol_ec(bgshift, vc, info) attr_col_ec(bgshift, vc, info, 0)
 153 #define attr_fgcol_ec(fgshift, vc, info) attr_col_ec(fgshift, vc, info, 1)
 154
 155     /*
 156      *  Scroll Method
 157      */
 158
 159 /* There are several methods fbcon can use to move text around the screen:
 160  *
 161  *                     Operation   Pan    Wrap
 162  *---------------------------------------------
 163  * SCROLL_MOVE         copyarea    No     No
 164  * SCROLL_PAN_MOVE     copyarea    Yes    No
 165  * SCROLL_WRAP_MOVE    copyarea    No     Yes
 166  * SCROLL_REDRAW       imageblit   No     No
 167  * SCROLL_PAN_REDRAW   imageblit   Yes    No
 168  * SCROLL_WRAP_REDRAW  imageblit   No     Yes
 169  *
 170  * (SCROLL_WRAP_REDRAW is not implemented yet)
 171  *
 172  * In general, fbcon will choose the best scrolling
 173  * method based on the rule below:
 174  *
 175  * Pan/Wrap > accel imageblit > accel copyarea >
 176  * soft imageblit > (soft copyarea)
 177  *
 178  * Exception to the rule: Pan + accel copyarea is
 179  * preferred over Pan + accel imageblit.
 180  *
 181  * The above is typical for PCI/AGP cards. Unless
 182  * overridden, fbcon will never use soft copyarea.
 183  *
 184  * If you need to override the above rule, set the
 185  * appropriate flags in fb_info->flags.  For example,
 186  * to prefer copyarea over imageblit, set
 187  * FBINFO_READS_FAST.
 188  *
 189  * Other notes:
 190  * + use the hardware engine to move the text
 191  *    (hw-accelerated copyarea() and fillrect())
 192  * + use hardware-supported panning on a large virtual screen
 193  * + amifb can not only pan, but also wrap the display by N lines
 194  *    (i.e. visible line i = physical line (i+N) % yres).
 195  * + read what's already rendered on the screen and
 196  *     write it in a different place (this is cfb_copyarea())
 197  * + re-render the text to the screen
 198  *
 199  * Whether to use wrapping or panning can only be figured out at
 200  * runtime (when we know whether our font height is a multiple
 201  * of the pan/wrap step)
 202  *
 203  */
 204
 205 #define SCROLL_MOVE        0x001
 206 #define SCROLL_PAN_MOVE    0x002
 207 #define SCROLL_WRAP_MOVE   0x003
 208 #define SCROLL_REDRAW      0x004
 209 #define SCROLL_PAN_REDRAW  0x005
 210
 211 #ifdef CONFIG_FB_TILEBLITTING
 212 extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info);
 213 #endif
 214 extern void fbcon_set_bitops(struct fbcon_ops *ops);
 215 extern int  soft_cursor(struct fb_info *info, struct fb_cursor *cursor);
 216
 217 #define FBCON_ATTRIBUTE_UNDERLINE 1
 218 #define FBCON_ATTRIBUTE_REVERSE   2
 219 #define FBCON_ATTRIBUTE_BOLD      4
 220
 221 static inline int real_y(struct fbcon_display *p, int ypos)
 222 {
 223         int rows = p->vrows;
 224
 225         ypos += p->yscroll;
 226         return ypos < rows ? ypos : ypos - rows;
 227 }
 228
 229
 230 static inline int get_attribute(struct fb_info *info, u16 c)
 231 {
 232         int attribute = 0;
 233
 234         if (fb_get_color_depth(&info->var, &info->fix) == 1) {
 235                 if (attr_underline(c))
 236                         attribute |= FBCON_ATTRIBUTE_UNDERLINE;
 237                 if (attr_reverse(c))
 238                         attribute |= FBCON_ATTRIBUTE_REVERSE;
 239                 if (attr_bold(c))
 240                         attribute |= FBCON_ATTRIBUTE_BOLD;
 241         }
 242
 243         return attribute;
 244 }
 245
 246 #define FBCON_SWAP(i,r,v) ({ \
 247         typeof(r) _r = (r);  \
 248         typeof(v) _v = (v);  \
 249         (void) (&_r == &_v); \
 250         (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; })
 251
 252 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
 253 extern void fbcon_set_rotate(struct fbcon_ops *ops);
 254 #else
 255 #define fbcon_set_rotate(x) do {} while(0)
 256 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 257
 258 #endif /* _VIDEO_FBCON_H */