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 :
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 save_graphics; /* for debug enter/leave */
78 : int flags;
79 : int rotate;
80 : int cur_rotate;
81 : char *cursor_data;
82 : u8 *fontbuffer;
83 : u8 *fontdata;
84 : u8 *cursor_src;
85 : u32 cursor_size;
86 : u32 fd_size;
87 : };
88 : /*
89 : * Attribute Decoding
90 : */
91 :
92 : /* Color */
93 : #define attr_fgcol(fgshift,s) \
94 : (((s) >> (fgshift)) & 0x0f)
95 : #define attr_bgcol(bgshift,s) \
96 : (((s) >> (bgshift)) & 0x0f)
97 :
98 : /* Monochrome */
99 : #define attr_bold(s) \
100 : ((s) & 0x200)
101 : #define attr_reverse(s) \
102 : ((s) & 0x800)
103 : #define attr_underline(s) \
104 : ((s) & 0x400)
105 : #define attr_blink(s) \
106 : ((s) & 0x8000)
107 :
108 :
109 : static inline int mono_col(const struct fb_info *info)
110 : {
111 : __u32 max_len;
112 0 : max_len = max(info->var.green.length, info->var.red.length);
113 0 : max_len = max(info->var.blue.length, max_len);
114 0 : return (~(0xfff << max_len)) & 0xff;
115 : }
116 :
117 : static inline int attr_col_ec(int shift, struct vc_data *vc,
118 : struct fb_info *info, int is_fg)
119 : {
120 : int is_mono01;
121 : int col;
122 : int fg;
123 : int bg;
124 :
125 0 : if (!vc)
126 : return 0;
127 :
128 0 : if (vc->vc_can_do_color)
129 0 : return is_fg ? attr_fgcol(shift,vc->vc_video_erase_char)
130 : : attr_bgcol(shift,vc->vc_video_erase_char);
131 :
132 0 : if (!info)
133 : return 0;
134 :
135 : col = mono_col(info);
136 0 : is_mono01 = info->fix.visual == FB_VISUAL_MONO01;
137 :
138 0 : if (attr_reverse(vc->vc_video_erase_char)) {
139 : fg = is_mono01 ? col : 0;
140 0 : bg = is_mono01 ? 0 : col;
141 : }
142 : else {
143 : fg = is_mono01 ? 0 : col;
144 0 : bg = is_mono01 ? col : 0;
145 : }
146 :
147 : return is_fg ? fg : bg;
148 : }
149 :
150 : #define attr_bgcol_ec(bgshift, vc, info) attr_col_ec(bgshift, vc, info, 0)
151 : #define attr_fgcol_ec(fgshift, vc, info) attr_col_ec(fgshift, vc, info, 1)
152 :
153 : /* Font */
154 : #define REFCOUNT(fd) (((int *)(fd))[-1])
155 : #define FNTSIZE(fd) (((int *)(fd))[-2])
156 : #define FNTCHARCNT(fd) (((int *)(fd))[-3])
157 : #define FNTSUM(fd) (((int *)(fd))[-4])
158 : #define FONT_EXTRA_WORDS 4
159 :
160 : /*
161 : * Scroll Method
162 : */
163 :
164 : /* There are several methods fbcon can use to move text around the screen:
165 : *
166 : * Operation Pan Wrap
167 : *---------------------------------------------
168 : * SCROLL_MOVE copyarea No No
169 : * SCROLL_PAN_MOVE copyarea Yes No
170 : * SCROLL_WRAP_MOVE copyarea No Yes
171 : * SCROLL_REDRAW imageblit No No
172 : * SCROLL_PAN_REDRAW imageblit Yes No
173 : * SCROLL_WRAP_REDRAW imageblit No Yes
174 : *
175 : * (SCROLL_WRAP_REDRAW is not implemented yet)
176 : *
177 : * In general, fbcon will choose the best scrolling
178 : * method based on the rule below:
179 : *
180 : * Pan/Wrap > accel imageblit > accel copyarea >
181 : * soft imageblit > (soft copyarea)
182 : *
183 : * Exception to the rule: Pan + accel copyarea is
184 : * preferred over Pan + accel imageblit.
185 : *
186 : * The above is typical for PCI/AGP cards. Unless
187 : * overridden, fbcon will never use soft copyarea.
188 : *
189 : * If you need to override the above rule, set the
190 : * appropriate flags in fb_info->flags. For example,
191 : * to prefer copyarea over imageblit, set
192 : * FBINFO_READS_FAST.
193 : *
194 : * Other notes:
195 : * + use the hardware engine to move the text
196 : * (hw-accelerated copyarea() and fillrect())
197 : * + use hardware-supported panning on a large virtual screen
198 : * + amifb can not only pan, but also wrap the display by N lines
199 : * (i.e. visible line i = physical line (i+N) % yres).
200 : * + read what's already rendered on the screen and
201 : * write it in a different place (this is cfb_copyarea())
202 : * + re-render the text to the screen
203 : *
204 : * Whether to use wrapping or panning can only be figured out at
205 : * runtime (when we know whether our font height is a multiple
206 : * of the pan/wrap step)
207 : *
208 : */
209 :
210 : #define SCROLL_MOVE 0x001
211 : #define SCROLL_PAN_MOVE 0x002
212 : #define SCROLL_WRAP_MOVE 0x003
213 : #define SCROLL_REDRAW 0x004
214 : #define SCROLL_PAN_REDRAW 0x005
215 :
216 : #ifdef CONFIG_FB_TILEBLITTING
217 : extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info);
218 : #endif
219 : extern void fbcon_set_bitops(struct fbcon_ops *ops);
220 : extern int soft_cursor(struct fb_info *info, struct fb_cursor *cursor);
221 :
222 : #define FBCON_ATTRIBUTE_UNDERLINE 1
223 : #define FBCON_ATTRIBUTE_REVERSE 2
224 : #define FBCON_ATTRIBUTE_BOLD 4
225 :
226 : static inline int real_y(struct display *p, int ypos)
227 : {
228 : int rows = p->vrows;
229 :
230 10151 : ypos += p->yscroll;
231 10151 : return ypos < rows ? ypos : ypos - rows;
232 : }
233 :
234 :
235 : static inline int get_attribute(struct fb_info *info, u16 c)
236 : {
237 : int attribute = 0;
238 :
239 10151 : if (fb_get_color_depth(&info->var, &info->fix) == 1) {
240 0 : if (attr_underline(c))
241 : attribute |= FBCON_ATTRIBUTE_UNDERLINE;
242 0 : if (attr_reverse(c))
243 0 : attribute |= FBCON_ATTRIBUTE_REVERSE;
244 0 : if (attr_bold(c))
245 0 : attribute |= FBCON_ATTRIBUTE_BOLD;
246 : }
247 :
248 : return attribute;
249 : }
250 :
251 : #define FBCON_SWAP(i,r,v) ({ \
252 : typeof(r) _r = (r); \
253 : typeof(v) _v = (v); \
254 : (void) (&_r == &_v); \
255 : (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; })
256 :
257 : #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
258 : extern void fbcon_set_rotate(struct fbcon_ops *ops);
259 : #else
260 : #define fbcon_set_rotate(x) do {} while(0)
261 : #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
262 :
263 : #endif /* _VIDEO_FBCON_H */
264 :
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