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 | #include <linux/workqueue.h> |
18 | |
19 | #include <asm/io.h> |
20 | |
21 | /* |
22 | * This is the interface between the low-level console driver and the |
23 | * low-level frame buffer device |
24 | */ |
25 | |
26 | struct fbcon_display { |
27 | /* Filled in by the low-level console driver */ |
28 | const u_char *fontdata; |
29 | int userfont; /* != 0 if fontdata kmalloc()ed */ |
30 | #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION |
31 | u_short scrollmode; /* Scroll Method, use fb_scrollmode() */ |
32 | #endif |
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 color, int bottom_only); |
64 | void (*cursor)(struct vc_data *vc, struct fb_info *info, |
65 | bool enable, 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 delayed_work cursor_work; /* Cursor timer */ |
70 | struct fb_cursor cursor_state; |
71 | struct fbcon_display *p; |
72 | struct fb_info *info; |
73 | int currcon; /* Current VC. */ |
74 | int cur_blink_jiffies; |
75 | int cursor_flash; |
76 | int cursor_reset; |
77 | int blank_state; |
78 | int graphics; |
79 | int save_graphics; /* for debug enter/leave */ |
80 | bool initialized; |
81 | int rotate; |
82 | int cur_rotate; |
83 | char *cursor_data; |
84 | u8 *fontbuffer; |
85 | u8 *fontdata; |
86 | u8 *cursor_src; |
87 | u32 cursor_size; |
88 | u32 fd_size; |
89 | }; |
90 | /* |
91 | * Attribute Decoding |
92 | */ |
93 | |
94 | /* Color */ |
95 | #define attr_fgcol(fgshift,s) \ |
96 | (((s) >> (fgshift)) & 0x0f) |
97 | #define attr_bgcol(bgshift,s) \ |
98 | (((s) >> (bgshift)) & 0x0f) |
99 | |
100 | /* Monochrome */ |
101 | #define attr_bold(s) \ |
102 | ((s) & 0x200) |
103 | #define attr_reverse(s) \ |
104 | ((s) & 0x800) |
105 | #define attr_underline(s) \ |
106 | ((s) & 0x400) |
107 | #define attr_blink(s) \ |
108 | ((s) & 0x8000) |
109 | |
110 | |
111 | static inline int mono_col(const struct fb_info *info) |
112 | { |
113 | __u32 max_len; |
114 | max_len = max(info->var.green.length, info->var.red.length); |
115 | max_len = max(info->var.blue.length, max_len); |
116 | return (~(0xfff << max_len)) & 0xff; |
117 | } |
118 | |
119 | static inline int attr_col_ec(int shift, struct vc_data *vc, |
120 | struct fb_info *info, int is_fg) |
121 | { |
122 | int is_mono01; |
123 | int col; |
124 | int fg; |
125 | int bg; |
126 | |
127 | if (!vc) |
128 | return 0; |
129 | |
130 | if (vc->vc_can_do_color) |
131 | return is_fg ? attr_fgcol(shift,vc->vc_video_erase_char) |
132 | : attr_bgcol(shift,vc->vc_video_erase_char); |
133 | |
134 | if (!info) |
135 | return 0; |
136 | |
137 | col = mono_col(info); |
138 | is_mono01 = info->fix.visual == FB_VISUAL_MONO01; |
139 | |
140 | if (attr_reverse(vc->vc_video_erase_char)) { |
141 | fg = is_mono01 ? col : 0; |
142 | bg = is_mono01 ? 0 : col; |
143 | } |
144 | else { |
145 | fg = is_mono01 ? 0 : col; |
146 | bg = is_mono01 ? col : 0; |
147 | } |
148 | |
149 | return is_fg ? fg : bg; |
150 | } |
151 | |
152 | #define attr_bgcol_ec(bgshift, vc, info) attr_col_ec(bgshift, vc, info, 0) |
153 | #define attr_fgcol_ec(fgshift, vc, info) attr_col_ec(fgshift, vc, info, 1) |
154 | |
155 | /* |
156 | * Scroll Method |
157 | */ |
158 | |
159 | /* There are several methods fbcon can use to move text around the screen: |
160 | * |
161 | * Operation Pan Wrap |
162 | *--------------------------------------------- |
163 | * SCROLL_MOVE copyarea No No |
164 | * SCROLL_PAN_MOVE copyarea Yes No |
165 | * SCROLL_WRAP_MOVE copyarea No Yes |
166 | * SCROLL_REDRAW imageblit No No |
167 | * SCROLL_PAN_REDRAW imageblit Yes No |
168 | * SCROLL_WRAP_REDRAW imageblit No Yes |
169 | * |
170 | * (SCROLL_WRAP_REDRAW is not implemented yet) |
171 | * |
172 | * In general, fbcon will choose the best scrolling |
173 | * method based on the rule below: |
174 | * |
175 | * Pan/Wrap > accel imageblit > accel copyarea > |
176 | * soft imageblit > (soft copyarea) |
177 | * |
178 | * Exception to the rule: Pan + accel copyarea is |
179 | * preferred over Pan + accel imageblit. |
180 | * |
181 | * The above is typical for PCI/AGP cards. Unless |
182 | * overridden, fbcon will never use soft copyarea. |
183 | * |
184 | * If you need to override the above rule, set the |
185 | * appropriate flags in fb_info->flags. For example, |
186 | * to prefer copyarea over imageblit, set |
187 | * FBINFO_READS_FAST. |
188 | * |
189 | * Other notes: |
190 | * + use the hardware engine to move the text |
191 | * (hw-accelerated copyarea() and fillrect()) |
192 | * + use hardware-supported panning on a large virtual screen |
193 | * + amifb can not only pan, but also wrap the display by N lines |
194 | * (i.e. visible line i = physical line (i+N) % yres). |
195 | * + read what's already rendered on the screen and |
196 | * write it in a different place (this is cfb_copyarea()) |
197 | * + re-render the text to the screen |
198 | * |
199 | * Whether to use wrapping or panning can only be figured out at |
200 | * runtime (when we know whether our font height is a multiple |
201 | * of the pan/wrap step) |
202 | * |
203 | */ |
204 | |
205 | #define SCROLL_MOVE 0x001 |
206 | #define SCROLL_PAN_MOVE 0x002 |
207 | #define SCROLL_WRAP_MOVE 0x003 |
208 | #define SCROLL_REDRAW 0x004 |
209 | #define SCROLL_PAN_REDRAW 0x005 |
210 | |
211 | static inline u_short fb_scrollmode(struct fbcon_display *fb) |
212 | { |
213 | #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION |
214 | return fb->scrollmode; |
215 | #else |
216 | /* hardcoded to SCROLL_REDRAW if acceleration was disabled. */ |
217 | return SCROLL_REDRAW; |
218 | #endif |
219 | } |
220 | |
221 | |
222 | #ifdef CONFIG_FB_TILEBLITTING |
223 | extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info); |
224 | #endif |
225 | extern void fbcon_set_bitops(struct fbcon_ops *ops); |
226 | extern int soft_cursor(struct fb_info *info, struct fb_cursor *cursor); |
227 | |
228 | #define FBCON_ATTRIBUTE_UNDERLINE 1 |
229 | #define FBCON_ATTRIBUTE_REVERSE 2 |
230 | #define FBCON_ATTRIBUTE_BOLD 4 |
231 | |
232 | static inline int real_y(struct fbcon_display *p, int ypos) |
233 | { |
234 | int rows = p->vrows; |
235 | |
236 | ypos += p->yscroll; |
237 | return ypos < rows ? ypos : ypos - rows; |
238 | } |
239 | |
240 | |
241 | static inline int get_attribute(struct fb_info *info, u16 c) |
242 | { |
243 | int attribute = 0; |
244 | |
245 | if (fb_get_color_depth(var: &info->var, fix: &info->fix) == 1) { |
246 | if (attr_underline(c)) |
247 | attribute |= FBCON_ATTRIBUTE_UNDERLINE; |
248 | if (attr_reverse(c)) |
249 | attribute |= FBCON_ATTRIBUTE_REVERSE; |
250 | if (attr_bold(c)) |
251 | attribute |= FBCON_ATTRIBUTE_BOLD; |
252 | } |
253 | |
254 | return attribute; |
255 | } |
256 | |
257 | #define FBCON_SWAP(i,r,v) ({ \ |
258 | typeof(r) _r = (r); \ |
259 | typeof(v) _v = (v); \ |
260 | (void) (&_r == &_v); \ |
261 | (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; }) |
262 | |
263 | #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION |
264 | extern void fbcon_set_rotate(struct fbcon_ops *ops); |
265 | #else |
266 | #define fbcon_set_rotate(x) do {} while(0) |
267 | #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */ |
268 | |
269 | #endif /* _VIDEO_FBCON_H */ |
270 | |