tjh.dev
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/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
28struct 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
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, 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
108static inline int mono_col(const struct fb_info *info)
109{
110 __u32 max_len;
111 max_len = max(info->var.green.length, info->var.red.length);
112 max_len = max(info->var.blue.length, max_len);
113 return (~(0xfff << max_len)) & 0xff;
114}
115
116static 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
216extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info);
217#endif
218extern void fbcon_set_bitops(struct fbcon_ops *ops);
219extern 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
225static inline int real_y(struct display *p, int ypos)
226{
227 int rows = p->vrows;
228
229 ypos += p->yscroll;
230 return ypos < rows ? ypos : ypos - rows;
231}
232
233
234static 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
257extern 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