Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
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/font.h>
15#include <linux/types.h>
16#include <linux/vt_buffer.h>
17#include <linux/vt_kern.h>
18#include <linux/workqueue.h>
19
20#include <asm/io.h>
21
22 /*
23 * This is the interface between the low-level console driver and the
24 * low-level frame buffer device
25 */
26
27struct fbcon_display {
28 /* Filled in by the low-level console driver */
29 font_data_t *fontdata;
30#ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
31 u_short scrollmode; /* Scroll Method, use fb_scrollmode() */
32#endif
33 short yscroll; /* Hardware scrolling */
34 int vrows; /* number of virtual rows */
35 int cursor_shape;
36 int con_rotate;
37 u32 xres_virtual;
38 u32 yres_virtual;
39 u32 height;
40 u32 width;
41 u32 bits_per_pixel;
42 u32 grayscale;
43 u32 nonstd;
44 u32 accel_flags;
45 u32 rotate;
46 struct fb_bitfield red;
47 struct fb_bitfield green;
48 struct fb_bitfield blue;
49 struct fb_bitfield transp;
50 const struct fb_videomode *mode;
51};
52
53struct fbcon_bitops {
54 void (*bmove)(struct vc_data *vc, struct fb_info *info, int sy,
55 int sx, int dy, int dx, int height, int width);
56 void (*clear)(struct vc_data *vc, struct fb_info *info, int sy,
57 int sx, int height, int width, int fb, int bg);
58 void (*putcs)(struct vc_data *vc, struct fb_info *info,
59 const unsigned short *s, int count, int yy, int xx,
60 int fg, int bg);
61 void (*clear_margins)(struct vc_data *vc, struct fb_info *info,
62 int color, int bottom_only);
63 void (*cursor)(struct vc_data *vc, struct fb_info *info,
64 bool enable, int fg, int bg);
65 int (*update_start)(struct fb_info *info);
66 int (*rotate_font)(struct fb_info *info, struct vc_data *vc);
67};
68
69struct fbcon_par {
70 struct fb_var_screeninfo var; /* copy of the current fb_var_screeninfo */
71 struct delayed_work cursor_work; /* Cursor timer */
72 struct fb_cursor cursor_state;
73 struct fbcon_display *p;
74 struct fb_info *info;
75 int currcon; /* Current VC. */
76 int cur_blink_jiffies;
77 int cursor_flash;
78 int cursor_reset;
79 int blank_state;
80 int graphics;
81 bool initialized;
82 int rotate;
83 char *cursor_data;
84#ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
85 struct {
86 font_data_t *fontdata; /* source font */
87 u8 *buf; /* rotated glyphs */
88 size_t bufsize;
89 int buf_rotate; /* rotation of buf */
90 } rotated;
91#endif
92 u8 *cursor_src;
93 u32 cursor_size;
94
95 const struct fbcon_bitops *bitops;
96};
97
98 /*
99 * Attribute Decoding
100 */
101
102/* Color */
103#define attr_fgcol(fgshift,s) \
104 (((s) >> (fgshift)) & 0x0f)
105#define attr_bgcol(bgshift,s) \
106 (((s) >> (bgshift)) & 0x0f)
107
108/* Monochrome */
109#define attr_bold(s) \
110 ((s) & 0x200)
111#define attr_reverse(s) \
112 ((s) & 0x800)
113#define attr_underline(s) \
114 ((s) & 0x400)
115#define attr_blink(s) \
116 ((s) & 0x8000)
117
118static inline int mono_col(const struct fb_info *info)
119{
120 __u32 max_len;
121 max_len = max(info->var.green.length, info->var.red.length);
122 max_len = max(info->var.blue.length, max_len);
123 return (~(0xfff << max_len)) & 0xff;
124}
125
126 /*
127 * Scroll Method
128 */
129
130/* There are several methods fbcon can use to move text around the screen:
131 *
132 * Operation Pan Wrap
133 *---------------------------------------------
134 * SCROLL_MOVE copyarea No No
135 * SCROLL_PAN_MOVE copyarea Yes No
136 * SCROLL_WRAP_MOVE copyarea No Yes
137 * SCROLL_REDRAW imageblit No No
138 * SCROLL_PAN_REDRAW imageblit Yes No
139 * SCROLL_WRAP_REDRAW imageblit No Yes
140 *
141 * (SCROLL_WRAP_REDRAW is not implemented yet)
142 *
143 * In general, fbcon will choose the best scrolling
144 * method based on the rule below:
145 *
146 * Pan/Wrap > accel imageblit > accel copyarea >
147 * soft imageblit > (soft copyarea)
148 *
149 * Exception to the rule: Pan + accel copyarea is
150 * preferred over Pan + accel imageblit.
151 *
152 * The above is typical for PCI/AGP cards. Unless
153 * overridden, fbcon will never use soft copyarea.
154 *
155 * If you need to override the above rule, set the
156 * appropriate flags in fb_info->flags. For example,
157 * to prefer copyarea over imageblit, set
158 * FBINFO_READS_FAST.
159 *
160 * Other notes:
161 * + use the hardware engine to move the text
162 * (hw-accelerated copyarea() and fillrect())
163 * + use hardware-supported panning on a large virtual screen
164 * + amifb can not only pan, but also wrap the display by N lines
165 * (i.e. visible line i = physical line (i+N) % yres).
166 * + read what's already rendered on the screen and
167 * write it in a different place (this is cfb_copyarea())
168 * + re-render the text to the screen
169 *
170 * Whether to use wrapping or panning can only be figured out at
171 * runtime (when we know whether our font height is a multiple
172 * of the pan/wrap step)
173 *
174 */
175
176#define SCROLL_MOVE 0x001
177#define SCROLL_PAN_MOVE 0x002
178#define SCROLL_WRAP_MOVE 0x003
179#define SCROLL_REDRAW 0x004
180#define SCROLL_PAN_REDRAW 0x005
181
182static inline u_short fb_scrollmode(struct fbcon_display *fb)
183{
184#ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
185 return fb->scrollmode;
186#else
187 /* hardcoded to SCROLL_REDRAW if acceleration was disabled. */
188 return SCROLL_REDRAW;
189#endif
190}
191
192
193#ifdef CONFIG_FB_TILEBLITTING
194extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info);
195#endif
196extern void fbcon_set_bitops_ur(struct fbcon_par *par);
197extern int soft_cursor(struct fb_info *info, struct fb_cursor *cursor);
198
199void fbcon_fill_cursor_mask(struct fbcon_par *par, struct vc_data *vc, unsigned char *mask);
200
201#define FBCON_ATTRIBUTE_UNDERLINE 1
202#define FBCON_ATTRIBUTE_REVERSE 2
203#define FBCON_ATTRIBUTE_BOLD 4
204
205static inline int real_y(struct fbcon_display *p, int ypos)
206{
207 int rows = p->vrows;
208
209 ypos += p->yscroll;
210 return ypos < rows ? ypos : ypos - rows;
211}
212
213
214static inline int get_attribute(struct fb_info *info, u16 c)
215{
216 int attribute = 0;
217
218 if (fb_get_color_depth(&info->var, &info->fix) == 1) {
219 if (attr_underline(c))
220 attribute |= FBCON_ATTRIBUTE_UNDERLINE;
221 if (attr_reverse(c))
222 attribute |= FBCON_ATTRIBUTE_REVERSE;
223 if (attr_bold(c))
224 attribute |= FBCON_ATTRIBUTE_BOLD;
225 }
226
227 return attribute;
228}
229
230#define FBCON_SWAP(i,r,v) ({ \
231 typeof(r) _r = (r); \
232 typeof(v) _v = (v); \
233 (void) (&_r == &_v); \
234 (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; })
235
236#endif /* _VIDEO_FBCON_H */