2 * linux/drivers/video/console/fbcon.h -- Low level frame buffer based console driver
4 * Copyright (C) 1997 Geert Uytterhoeven
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
11 #ifndef _VIDEO_FBCON_H
12 #define _VIDEO_FBCON_H
14 #include <linux/config.h>
15 #include <linux/types.h>
16 #include <linux/vt_buffer.h>
17 #include <linux/vt_kern.h>
22 * This is the interface between the low-level console driver and the
23 * low-level frame buffer device
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 */
31 int userfont; /* != 0 if fontdata kmalloc()ed */
32 u_short scrollmode; /* Scroll Method */
33 short yscroll; /* Hardware scrolling */
34 int vrows; /* number of virtual rows */
38 /* drivers/video/console/fbcon.c */
39 extern signed char con2fb_map[MAX_NR_CONSOLES];
40 extern int set_con2fb_map(int unit, int newidx);
47 #define attr_fgcol(fgshift,s) \
48 (((s) >> (fgshift)) & 0x0f)
49 #define attr_bgcol(bgshift,s) \
50 (((s) >> (bgshift)) & 0x0f)
51 #define attr_bgcol_ec(bgshift,vc) \
52 ((vc) ? (((vc)->vc_video_erase_char >> (bgshift)) & 0x0f) : 0)
53 #define attr_fgcol_ec(fgshift,vc) \
54 ((vc) ? (((vc)->vc_video_erase_char >> (fgshift)) & 0x0f) : 0)
57 #define attr_bold(s) \
59 #define attr_reverse(s, inverse) \
60 (((s) & 0x800) ^ (inverse ? 0x800 : 0))
61 #define attr_underline(s) \
63 #define attr_blink(s) \
70 /* There are several methods fbcon can use to move text around the screen:
73 *---------------------------------------------
74 * SCROLL_MOVE copyarea No No
75 * SCROLL_PAN_MOVE copyarea Yes No
76 * SCROLL_WRAP_MOVE copyarea No Yes
77 * SCROLL_REDRAW imageblit No No
78 * SCROLL_PAN_REDRAW imageblit Yes No
79 * SCROLL_WRAP_REDRAW imageblit No Yes
81 * (SCROLL_WRAP_REDRAW is not implemented yet)
83 * In general, fbcon will choose the best scrolling
84 * method based on the rule below:
86 * Pan/Wrap > accel imageblit > accel copyarea >
87 * soft imageblit > (soft copyarea)
89 * Exception to the rule: Pan + accel copyarea is
90 * preferred over Pan + accel imageblit.
92 * The above is typical for PCI/AGP cards. Unless
93 * overridden, fbcon will never use soft copyarea.
95 * If you need to override the above rule, set the
96 * appropriate flags in fb_info->flags. For example,
97 * to prefer copyarea over imageblit, set
101 * + use the hardware engine to move the text
102 * (hw-accelerated copyarea() and fillrect())
103 * + use hardware-supported panning on a large virtual screen
104 * + amifb can not only pan, but also wrap the display by N lines
105 * (i.e. visible line i = physical line (i+N) % yres).
106 * + read what's already rendered on the screen and
107 * write it in a different place (this is cfb_copyarea())
108 * + re-render the text to the screen
110 * Whether to use wrapping or panning can only be figured out at
111 * runtime (when we know whether our font height is a multiple
112 * of the pan/wrap step)
116 #define SCROLL_MOVE 0x001
117 #define SCROLL_PAN_MOVE 0x002
118 #define SCROLL_WRAP_MOVE 0x003
119 #define SCROLL_REDRAW 0x004
120 #define SCROLL_PAN_REDRAW 0x005
122 extern int fb_console_init(void);
124 #endif /* _VIDEO_FBCON_H */