tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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#define FBCON_FLAGS_INIT 1
22
23 /*
24 * This is the interface between the low-level console driver and the
25 * low-level frame buffer device
26 */
27
28struct display {
29 /* Filled in by the frame buffer device */
30 u_short inverse; /* != 0 text black on white as default */
31 /* Filled in by the low-level console driver */
32 u_char *fontdata;
33 int userfont; /* != 0 if fontdata kmalloc()ed */
34 u_short scrollmode; /* Scroll Method */
35 short yscroll; /* Hardware scrolling */
36 int vrows; /* number of virtual rows */
37 int cursor_shape;
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 struct fb_videomode *mode;
52};
53
54struct 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,
65 struct display *p, int mode, int softback_lines, int fg, int bg);
66
67 struct timer_list cursor_timer; /* Cursor timer */
68 struct fb_cursor cursor_state;
69 int currcon; /* Current VC. */
70 int cursor_flash;
71 int cursor_reset;
72 int blank_state;
73 int graphics;
74 int flags;
75 char *cursor_data;
76};
77 /*
78 * Attribute Decoding
79 */
80
81/* Color */
82#define attr_fgcol(fgshift,s) \
83 (((s) >> (fgshift)) & 0x0f)
84#define attr_bgcol(bgshift,s) \
85 (((s) >> (bgshift)) & 0x0f)
86#define attr_bgcol_ec(bgshift,vc) \
87 ((vc) ? (((vc)->vc_video_erase_char >> (bgshift)) & 0x0f) : 0)
88#define attr_fgcol_ec(fgshift,vc) \
89 ((vc) ? (((vc)->vc_video_erase_char >> (fgshift)) & 0x0f) : 0)
90
91/* Monochrome */
92#define attr_bold(s) \
93 ((s) & 0x200)
94#define attr_reverse(s) \
95 ((s) & 0x800)
96#define attr_underline(s) \
97 ((s) & 0x400)
98#define attr_blink(s) \
99 ((s) & 0x8000)
100
101/* Font */
102#define REFCOUNT(fd) (((int *)(fd))[-1])
103#define FNTSIZE(fd) (((int *)(fd))[-2])
104#define FNTCHARCNT(fd) (((int *)(fd))[-3])
105#define FNTSUM(fd) (((int *)(fd))[-4])
106#define FONT_EXTRA_WORDS 4
107
108 /*
109 * Scroll Method
110 */
111
112/* There are several methods fbcon can use to move text around the screen:
113 *
114 * Operation Pan Wrap
115 *---------------------------------------------
116 * SCROLL_MOVE copyarea No No
117 * SCROLL_PAN_MOVE copyarea Yes No
118 * SCROLL_WRAP_MOVE copyarea No Yes
119 * SCROLL_REDRAW imageblit No No
120 * SCROLL_PAN_REDRAW imageblit Yes No
121 * SCROLL_WRAP_REDRAW imageblit No Yes
122 *
123 * (SCROLL_WRAP_REDRAW is not implemented yet)
124 *
125 * In general, fbcon will choose the best scrolling
126 * method based on the rule below:
127 *
128 * Pan/Wrap > accel imageblit > accel copyarea >
129 * soft imageblit > (soft copyarea)
130 *
131 * Exception to the rule: Pan + accel copyarea is
132 * preferred over Pan + accel imageblit.
133 *
134 * The above is typical for PCI/AGP cards. Unless
135 * overridden, fbcon will never use soft copyarea.
136 *
137 * If you need to override the above rule, set the
138 * appropriate flags in fb_info->flags. For example,
139 * to prefer copyarea over imageblit, set
140 * FBINFO_READS_FAST.
141 *
142 * Other notes:
143 * + use the hardware engine to move the text
144 * (hw-accelerated copyarea() and fillrect())
145 * + use hardware-supported panning on a large virtual screen
146 * + amifb can not only pan, but also wrap the display by N lines
147 * (i.e. visible line i = physical line (i+N) % yres).
148 * + read what's already rendered on the screen and
149 * write it in a different place (this is cfb_copyarea())
150 * + re-render the text to the screen
151 *
152 * Whether to use wrapping or panning can only be figured out at
153 * runtime (when we know whether our font height is a multiple
154 * of the pan/wrap step)
155 *
156 */
157
158#define SCROLL_MOVE 0x001
159#define SCROLL_PAN_MOVE 0x002
160#define SCROLL_WRAP_MOVE 0x003
161#define SCROLL_REDRAW 0x004
162#define SCROLL_PAN_REDRAW 0x005
163
164#ifdef CONFIG_FB_TILEBLITTING
165extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info,
166 struct display *p, struct fbcon_ops *ops);
167#endif
168extern void fbcon_set_bitops(struct fbcon_ops *ops);
169
170#endif /* _VIDEO_FBCON_H */