Line data Source code
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 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 1 :
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 bottom_only);
64 : void (*cursor)(struct vc_data *vc, struct fb_info *info, int mode,
65 : int softback_lines, 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 display *p;
72 : int currcon; /* Current VC. */
73 : int cursor_flash;
74 : int cursor_reset;
75 : int blank_state;
76 : int graphics;
77 : int flags;
78 : int rotate;
79 : int cur_rotate;
80 : char *cursor_data;
81 : u8 *fontbuffer;
82 : u8 *fontdata;
83 : u8 *cursor_src;
84 : u32 cursor_size;
85 : u32 fd_size;
86 : };
87 : /*
88 : * Attribute Decoding
89 : */
90 :
91 : /* Color */
92 : #define attr_fgcol(fgshift,s) \
93 : (((s) >> (fgshift)) & 0x0f)
94 : #define attr_bgcol(bgshift,s) \
95 : (((s) >> (bgshift)) & 0x0f)
96 :
97 : /* Monochrome */
98 : #define attr_bold(s) \
99 : ((s) & 0x200)
100 : #define attr_reverse(s) \
101 : ((s) & 0x800)
102 : #define attr_underline(s) \
103 : ((s) & 0x400)
104 : #define attr_blink(s) \
105 : ((s) & 0x8000)
106 :
107 :
108 : static inline int mono_col(const struct fb_info *info)
109 : {
110 422 : __u32 max_len;
111 3798 : max_len = max(info->var.green.length, info->var.red.length);
112 3798 : max_len = max(info->var.blue.length, max_len);
113 844 : return (~(0xfff << max_len)) & 0xff;
114 422 : }
115 :
116 : static inline int attr_col_ec(int shift, struct vc_data *vc,
117 : struct fb_info *info, int is_fg)
118 : {
119 : int is_mono01;
120 : int col;
121 : int fg;
122 : int bg;
123 :
124 : if (!vc)
125 : return 0;
126 :
127 : if (vc->vc_can_do_color)
128 : return is_fg ? attr_fgcol(shift,vc->vc_video_erase_char)
129 : : attr_bgcol(shift,vc->vc_video_erase_char);
130 :
131 : if (!info)
132 : return 0;
133 :
134 : col = mono_col(info);
135 : is_mono01 = info->fix.visual == FB_VISUAL_MONO01;
136 :
137 : if (attr_reverse(vc->vc_video_erase_char)) {
138 : fg = is_mono01 ? col : 0;
139 : bg = is_mono01 ? 0 : col;
140 : }
141 : else {
142 : fg = is_mono01 ? 0 : col;
143 : bg = is_mono01 ? col : 0;
144 : }
145 :
146 : return is_fg ? fg : bg;
147 : }
148 :
149 : #define attr_bgcol_ec(bgshift, vc, info) attr_col_ec(bgshift, vc, info, 0)
150 : #define attr_fgcol_ec(fgshift, vc, info) attr_col_ec(fgshift, vc, info, 1)
151 :
152 : /* Font */
153 : #define REFCOUNT(fd) (((int *)(fd))[-1])
154 : #define FNTSIZE(fd) (((int *)(fd))[-2])
155 : #define FNTCHARCNT(fd) (((int *)(fd))[-3])
156 : #define FNTSUM(fd) (((int *)(fd))[-4])
157 : #define FONT_EXTRA_WORDS 4
158 :
159 : /*
160 : * Scroll Method
161 : */
162 :
163 : /* There are several methods fbcon can use to move text around the screen:
164 : *
165 : * Operation Pan Wrap
166 : *---------------------------------------------
167 : * SCROLL_MOVE copyarea No No
168 : * SCROLL_PAN_MOVE copyarea Yes No
169 : * SCROLL_WRAP_MOVE copyarea No Yes
170 : * SCROLL_REDRAW imageblit No No
171 : * SCROLL_PAN_REDRAW imageblit Yes No
172 : * SCROLL_WRAP_REDRAW imageblit No Yes
173 : *
174 : * (SCROLL_WRAP_REDRAW is not implemented yet)
175 : *
176 : * In general, fbcon will choose the best scrolling
177 : * method based on the rule below:
178 : *
179 : * Pan/Wrap > accel imageblit > accel copyarea >
180 : * soft imageblit > (soft copyarea)
181 : *
182 : * Exception to the rule: Pan + accel copyarea is
183 : * preferred over Pan + accel imageblit.
184 : *
185 : * The above is typical for PCI/AGP cards. Unless
186 : * overridden, fbcon will never use soft copyarea.
187 : *
188 : * If you need to override the above rule, set the
189 : * appropriate flags in fb_info->flags. For example,
190 : * to prefer copyarea over imageblit, set
191 : * FBINFO_READS_FAST.
192 : *
193 : * Other notes:
194 : * + use the hardware engine to move the text
195 : * (hw-accelerated copyarea() and fillrect())
196 : * + use hardware-supported panning on a large virtual screen
197 : * + amifb can not only pan, but also wrap the display by N lines
198 : * (i.e. visible line i = physical line (i+N) % yres).
199 : * + read what's already rendered on the screen and
200 : * write it in a different place (this is cfb_copyarea())
201 : * + re-render the text to the screen
202 : *
203 : * Whether to use wrapping or panning can only be figured out at
204 : * runtime (when we know whether our font height is a multiple
205 : * of the pan/wrap step)
206 : *
207 : */
208 :
209 : #define SCROLL_MOVE 0x001
210 : #define SCROLL_PAN_MOVE 0x002
211 : #define SCROLL_WRAP_MOVE 0x003
212 : #define SCROLL_REDRAW 0x004
213 : #define SCROLL_PAN_REDRAW 0x005
214 :
215 : #ifdef CONFIG_FB_TILEBLITTING
216 : extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info);
217 : #endif
218 : extern void fbcon_set_bitops(struct fbcon_ops *ops);
219 : extern int soft_cursor(struct fb_info *info, struct fb_cursor *cursor);
220 :
221 : #define FBCON_ATTRIBUTE_UNDERLINE 1
222 : #define FBCON_ATTRIBUTE_REVERSE 2
223 : #define FBCON_ATTRIBUTE_BOLD 4
224 :
225 : static inline int real_y(struct display *p, int ypos)
226 : {
227 498 : int rows = p->vrows;
228 :
229 498 : ypos += p->yscroll;
230 1494 : return ypos < rows ? ypos : ypos - rows;
231 : }
232 :
233 :
234 : static inline int get_attribute(struct fb_info *info, u16 c)
235 : {
236 : int attribute = 0;
237 :
238 : if (fb_get_color_depth(&info->var, &info->fix) == 1) {
239 : if (attr_underline(c))
240 : attribute |= FBCON_ATTRIBUTE_UNDERLINE;
241 : if (attr_reverse(c))
242 : attribute |= FBCON_ATTRIBUTE_REVERSE;
243 : if (attr_bold(c))
244 : attribute |= FBCON_ATTRIBUTE_BOLD;
245 : }
246 :
247 : return attribute;
248 : }
249 :
250 : #define FBCON_SWAP(i,r,v) ({ \
251 : typeof(r) _r = (r); \
252 : typeof(v) _v = (v); \
253 : (void) (&_r == &_v); \
254 : (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; })
255 :
256 : #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
257 : extern void fbcon_set_rotate(struct fbcon_ops *ops);
258 : #else
259 : #define fbcon_set_rotate(x) do {} while(0)
260 : #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
261 :
262 : #endif /* _VIDEO_FBCON_H */
263 :
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