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/config.h>
  15 #include <linux/types.h>
  16 #include <linux/vt_buffer.h>
  17 #include <linux/vt_kern.h>
  18
  19 #include <asm/io.h>
  20
  21    /*
  22     *    This is the interface between the low-level console driver and the
  23     *    low-level frame buffer device
  24     */
  25
  26 struct display {
  27     /* Filled in by the frame buffer device */
  28     u_short inverse;                /* != 0 text black on white as default */
  29     /* Filled in by the low-level console driver */
  30     char fontname[40];              /* Font associated to this display */
  31     u_char *fontdata;
  32     int userfont;                   /* != 0 if fontdata kmalloc()ed */
  33     u_short scrollmode;             /* Scroll Method */
  34     short yscroll;                  /* Hardware scrolling */
  35     int vrows;                      /* number of virtual rows */
  36     int cursor_shape;
  37 };
  38
  39 /* drivers/video/console/fbcon.c */
  40 extern char con2fb_map[MAX_NR_CONSOLES];
  41 extern int set_con2fb_map(int unit, int newidx);
  42
  43     /*
  44      *  Attribute Decoding
  45      */
  46
  47 /* Color */
  48 #define attr_fgcol(fgshift,s)    \
  49         (((s) >> (fgshift)) & 0x0f)
  50 #define attr_bgcol(bgshift,s)    \
  51         (((s) >> (bgshift)) & 0x0f)
  52 #define attr_bgcol_ec(bgshift,vc) \
  53         ((vc) ? (((vc)->vc_video_erase_char >> (bgshift)) & 0x0f) : 0)
  54 #define attr_fgcol_ec(fgshift,vc) \
  55         ((vc) ? (((vc)->vc_video_erase_char >> (fgshift)) & 0x0f) : 0)
  56
  57 /* Monochrome */
  58 #define attr_bold(s) \
  59         ((s) & 0x200)
  60 #define attr_reverse(s, inverse) \
  61         (((s) & 0x800) ^ (inverse ? 0x800 : 0))
  62 #define attr_underline(s) \
  63         ((s) & 0x400)
  64 #define attr_blink(s) \
  65         ((s) & 0x8000)
  66
  67     /*
  68      *  Scroll Method
  69      */
  70
  71 /* Internal flags */
  72 #define __SCROLL_YPAN           0x001
  73 #define __SCROLL_YWRAP          0x002
  74 #define __SCROLL_YMOVE          0x003
  75 #define __SCROLL_YREDRAW        0x004
  76 #define __SCROLL_YMASK          0x00f
  77 #define __SCROLL_YFIXED         0x010
  78 #define __SCROLL_YNOMOVE        0x020
  79 #define __SCROLL_YPANREDRAW     0x040
  80 #define __SCROLL_YNOPARTIAL     0x080
  81
  82 /* Only these should be used by the drivers */
  83 /* Which one should you use? If you have a fast card and slow bus,
  84    then probably just 0 to indicate fbcon should choose between
  85    YWRAP/YPAN+MOVE/YMOVE. On the other side, if you have a fast bus
  86    and even better if your card can do fonting (1->8/32bit painting),
  87    you should consider either SCROLL_YREDRAW (if your card is
  88    able to do neither YPAN/YWRAP), or SCROLL_YNOMOVE.
  89    The best is to test it with some real life scrolling (usually, not
  90    all lines on the screen are filled completely with non-space characters,
  91    and REDRAW performs much better on such lines, so don't cat a file
  92    with every line covering all screen columns, it would not be the right
  93    benchmark).
  94  */
  95 #define SCROLL_YREDRAW          (__SCROLL_YFIXED|__SCROLL_YREDRAW)
  96 #define SCROLL_YNOMOVE          (__SCROLL_YNOMOVE|__SCROLL_YPANREDRAW)
  97
  98 /* SCROLL_YNOPARTIAL, used in combination with the above, is for video
  99    cards which can not handle using panning to scroll a portion of the
 100    screen without excessive flicker.  Panning will only be used for
 101    whole screens.
 102  */
 103 /* Namespace consistency */
 104 #define SCROLL_YNOPARTIAL       __SCROLL_YNOPARTIAL
 105
 106 extern int fb_console_init(void);
 107
 108 #endif /* _VIDEO_FBCON_H */