1 /*
2 * linux/drivers/video/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/config.h>
15 #include <linux/types.h>
16 #include <linux/console_struct.h>
17 #include <linux/vt_buffer.h>
18
19 #include <asm/io.h>
20
21
22 /*
23 * `switch' for the Low Level Operations
24 */
25
26 struct display_switch {
27 void (*setup)(struct display *p);
28 void (*bmove)(struct display *p, int sy, int sx, int dy, int dx,
29 int height, int width);
30 /* for clear, conp may be NULL, which means use a blanking (black) color */
31 void (*clear)(struct vc_data *conp, struct display *p, int sy, int sx,
32 int height, int width);
33 void (*putc)(struct vc_data *conp, struct display *p, int c, int yy,
34 int xx);
35 void (*putcs)(struct vc_data *conp, struct display *p, const unsigned short *s,
36 int count, int yy, int xx);
37 void (*revc)(struct display *p, int xx, int yy);
38 void (*cursor)(struct display *p, int mode, int xx, int yy);
39 int (*set_font)(struct display *p, int width, int height);
40 void (*clear_margins)(struct vc_data *conp, struct display *p,
41 int bottom_only);
42 unsigned int fontwidthmask; /* 1 at (1 << (width - 1)) if width is supported */
43 };
44
45 extern struct display_switch fbcon_dummy;
46
47 /*
48 * This is the interface between the low-level console driver and the
49 * low-level frame buffer device
50 */
51
52 struct display {
53 /* Filled in by the frame buffer device */
54
55 struct fb_var_screeninfo var; /* variable infos. yoffset and vmode */
56 /* are updated by fbcon.c */
57 struct fb_cmap cmap; /* colormap */
58 char *screen_base; /* pointer to top of virtual screen */
59 /* (virtual address) */
60 int visual;
61 int type; /* see FB_TYPE_* */
62 int type_aux; /* Interleave for interleaved Planes */
63 u_short ypanstep; /* zero if no hardware ypan */
64 u_short ywrapstep; /* zero if no hardware ywrap */
65 u_long line_length; /* length of a line in bytes */
66 u_short can_soft_blank; /* zero if no hardware blanking */
67 u_short inverse; /* != 0 text black on white as default */
68 struct display_switch *dispsw; /* low level operations */
69 void *dispsw_data; /* optional dispsw helper data */
70
71 #if 0
72 struct fb_fix_cursorinfo fcrsr;
73 struct fb_var_cursorinfo *vcrsr;
74 struct fb_cursorstate crsrstate;
75 #endif
76
77 /* Filled in by the low-level console driver */
78
79 struct vc_data *conp; /* pointer to console data */
80 struct fb_info *fb_info; /* frame buffer for this console */
81 int vrows; /* number of virtual rows */
82 unsigned short cursor_x; /* current cursor position */
83 unsigned short cursor_y;
84 int fgcol; /* text colors */
85 int bgcol;
86 u_long next_line; /* offset to one line below */
87 u_long next_plane; /* offset to next plane */
88 u_char *fontdata; /* Font associated to this display */
89 unsigned short _fontheightlog;
90 unsigned short _fontwidthlog;
91 unsigned short _fontheight;
92 unsigned short _fontwidth;
93 int userfont; /* != 0 if fontdata kmalloc()ed */
94 u_short scrollmode; /* Scroll Method */
95 short yscroll; /* Hardware scrolling */
96 unsigned char fgshift, bgshift;
97 unsigned short charmask; /* 0xff or 0x1ff */
98 };
99
100 /* drivers/video/fbcon.c */
101 extern struct display fb_display[MAX_NR_CONSOLES];
102 extern char con2fb_map[MAX_NR_CONSOLES];
103 extern int PROC_CONSOLE(const struct fb_info *info);
104 extern void set_con2fb_map(int unit, int newidx);
105 extern int set_all_vcs(int fbidx, struct fb_ops *fb,
106 struct fb_var_screeninfo *var, struct fb_info *info);
107
108 #define fontheight(p) ((p)->_fontheight)
109 #define fontheightlog(p) ((p)->_fontheightlog)
110
111 #ifdef CONFIG_FBCON_FONTWIDTH8_ONLY
112
113 /* fontwidth w is supported by dispsw */
114 #define FONTWIDTH(w) (1 << ((8) - 1))
115 /* fontwidths w1-w2 inclusive are supported by dispsw */
116 #define FONTWIDTHRANGE(w1,w2) FONTWIDTH(8)
117
118 #define fontwidth(p) (8)
119 #define fontwidthlog(p) (0)
120
121 #else
122
123 /* fontwidth w is supported by dispsw */
124 #define FONTWIDTH(w) (1 << ((w) - 1))
125 /* fontwidths w1-w2 inclusive are supported by dispsw */
126 #define FONTWIDTHRANGE(w1,w2) (FONTWIDTH(w2+1) - FONTWIDTH(w1))
127
128 #define fontwidth(p) ((p)->_fontwidth)
129 #define fontwidthlog(p) ((p)->_fontwidthlog)
130
131 #endif
132
133 /*
134 * Attribute Decoding
135 */
136
137 /* Color */
138 #define attr_fgcol(p,s) \
139 (((s) >> ((p)->fgshift)) & 0x0f)
140 #define attr_bgcol(p,s) \
141 (((s) >> ((p)->bgshift)) & 0x0f)
142 #define attr_bgcol_ec(p,conp) \
143 ((conp) ? (((conp)->vc_video_erase_char >> ((p)->bgshift)) & 0x0f) : 0)
144
145 /* Monochrome */
146 #define attr_bold(p,s) \
147 ((s) & 0x200)
148 #define attr_reverse(p,s) \
149 (((s) & 0x800) ^ ((p)->inverse ? 0x800 : 0))
150 #define attr_underline(p,s) \
151 ((s) & 0x400)
152 #define attr_blink(p,s) \
153 ((s) & 0x8000)
154
155 /*
156 * Scroll Method
157 */
158
159 /* Internal flags */
160 #define __SCROLL_YPAN 0x001
161 #define __SCROLL_YWRAP 0x002
162 #define __SCROLL_YMOVE 0x003
163 #define __SCROLL_YREDRAW 0x004
164 #define __SCROLL_YMASK 0x00f
165 #define __SCROLL_YFIXED 0x010
166 #define __SCROLL_YNOMOVE 0x020
167 #define __SCROLL_YPANREDRAW 0x040
168 #define __SCROLL_YNOPARTIAL 0x080
169
170 /* Only these should be used by the drivers */
171 /* Which one should you use? If you have a fast card and slow bus,
172 then probably just 0 to indicate fbcon should choose between
173 YWRAP/YPAN+MOVE/YMOVE. On the other side, if you have a fast bus
174 and even better if your card can do fonting (1->8/32bit painting),
175 you should consider either SCROLL_YREDRAW (if your card is
176 able to do neither YPAN/YWRAP), or SCROLL_YNOMOVE.
177 The best is to test it with some real life scrolling (usually, not
178 all lines on the screen are filled completely with non-space characters,
179 and REDRAW performs much better on such lines, so don't cat a file
180 with every line covering all screen columns, it would not be the right
181 benchmark).
182 */
183 #define SCROLL_YREDRAW (__SCROLL_YFIXED|__SCROLL_YREDRAW)
184 #define SCROLL_YNOMOVE (__SCROLL_YNOMOVE|__SCROLL_YPANREDRAW)
185
186 /* SCROLL_YNOPARTIAL, used in combination with the above, is for video
187 cards which can not handle using panning to scroll a portion of the
188 screen without excessive flicker. Panning will only be used for
189 whole screens.
190 */
191 /* Namespace consistency */
192 #define SCROLL_YNOPARTIAL __SCROLL_YNOPARTIAL
193
194
195 #if defined(__sparc__)
196
197 /* We map all of our framebuffers such that big-endian accesses
198 * are what we want, so the following is sufficient.
199 */
200
201 #define fb_readb sbus_readb
202 #define fb_readw sbus_readw
203 #define fb_readl sbus_readl
204 #define fb_writeb sbus_writeb
205 #define fb_writew sbus_writew
206 #define fb_writel sbus_writel
207 #define fb_memset sbus_memset_io
208
209 #elif defined(__i386__) || defined(__alpha__)
210
211 #define fb_readb __raw_readb
212 #define fb_readw __raw_readw
213 #define fb_readl __raw_readl
214 #define fb_writeb __raw_writeb
215 #define fb_writew __raw_writew
216 #define fb_writel __raw_writel
217 #define fb_memset memset_io
218
219 #else
220
221 #define fb_readb(addr) (*(volatile u8 *) (addr))
222 #define fb_readw(addr) (*(volatile u16 *) (addr))
223 #define fb_readl(addr) (*(volatile u32 *) (addr))
224 #define fb_writeb(b,addr) (*(volatile u8 *) (addr) = (b))
225 #define fb_writew(b,addr) (*(volatile u16 *) (addr) = (b))
226 #define fb_writel(b,addr) (*(volatile u32 *) (addr) = (b))
227 #define fb_memset memset
228
229 #endif
230
231
232 extern void fbcon_redraw_clear(struct vc_data *, struct display *, int, int, int, int);
233 extern void fbcon_redraw_bmove(struct display *, int, int, int, int, int, int);
234
235
236 /* ================================================================= */
237 /* Utility Assembler Functions */
238 /* ================================================================= */
239
240
241 #if defined(__mc68000__)
242
243 /* ====================================================================== */
244
245 /* Those of a delicate disposition might like to skip the next couple of
246 * pages.
247 *
248 * These functions are drop in replacements for memmove and
249 * memset(_, 0, _). However their five instances add at least a kilobyte
250 * to the object file. You have been warned.
251 *
252 * Not a great fan of assembler for the sake of it, but I think
253 * that these routines are at least 10 times faster than their C
254 * equivalents for large blits, and that's important to the lowest level of
255 * a graphics driver. Question is whether some scheme with the blitter
256 * would be faster. I suspect not for simple text system - not much
257 * asynchrony.
258 *
259 * Code is very simple, just gruesome expansion. Basic strategy is to
260 * increase data moved/cleared at each step to 16 bytes to reduce
261 * instruction per data move overhead. movem might be faster still
262 * For more than 15 bytes, we try to align the write direction on a
263 * longword boundary to get maximum speed. This is even more gruesome.
264 * Unaligned read/write used requires 68020+ - think this is a problem?
265 *
266 * Sorry!
267 */
268
269
270 /* ++roman: I've optimized Robert's original versions in some minor
271 * aspects, e.g. moveq instead of movel, let gcc choose the registers,
272 * use movem in some places...
273 * For other modes than 1 plane, lots of more such assembler functions
274 * were needed (e.g. the ones using movep or expanding color values).
275 */
276
277 /* ++andreas: more optimizations:
278 subl #65536,d0 replaced by clrw d0; subql #1,d0 for dbcc
279 addal is faster than addaw
280 movep is rather expensive compared to ordinary move's
281 some functions rewritten in C for clarity, no speed loss */
282
283 static __inline__ void *fb_memclear_small(void *s, size_t count)
284 {
285 if (!count)
286 return(0);
287
288 __asm__ __volatile__(
289 "lsrl #1,%1 ; jcc 1f ; moveb %2,%0@-\n\t"
290 "1: lsrl #1,%1 ; jcc 1f ; movew %2,%0@-\n\t"
291 "1: lsrl #1,%1 ; jcc 1f ; movel %2,%0@-\n\t"
292 "1: lsrl #1,%1 ; jcc 1f ; movel %2,%0@- ; movel %2,%0@-\n\t"
293 "1:"
294 : "=a" (s), "=d" (count)
295 : "d" (0), "" ((char *)s+count), "1" (count)
296 );
297 __asm__ __volatile__(
298 "subql #1,%1 ; jcs 3f\n\t"
299 "movel %2,%%d4; movel %2,%%d5; movel %2,%%d6\n\t"
300 "2: moveml %2/%%d4/%%d5/%%d6,%0@-\n\t"
301 "dbra %1,2b\n\t"
302 "3:"
303 : "=a" (s), "=d" (count)
304 : "d" (0), "" (s), "1" (count)
305 : "d4", "d5", "d6"
306 );
307
308 return(0);
309 }
310
311
312 static __inline__ void *fb_memclear(void *s, size_t count)
313 {
314 if (!count)
315 return(0);
316
317 if (count < 16) {
318 __asm__ __volatile__(
319 "lsrl #1,%1 ; jcc 1f ; clrb %0@+\n\t"
320 "1: lsrl #1,%1 ; jcc 1f ; clrw %0@+\n\t"
321 "1: lsrl #1,%1 ; jcc 1f ; clrl %0@+\n\t"
322 "1: lsrl #1,%1 ; jcc 1f ; clrl %0@+ ; clrl %0@+\n\t"
323 "1:"
324 : "=a" (s), "=d" (count)
325 : "" (s), "1" (count)
326 );
327 } else {
328 long tmp;
329 __asm__ __volatile__(
330 "movel %1,%2\n\t"
331 "lsrl #1,%2 ; jcc 1f ; clrb %0@+ ; subqw #1,%1\n\t"
332 "lsrl #1,%2 ; jcs 2f\n\t" /* %0 increased=>bit 2 switched*/
333 "clrw %0@+ ; subqw #2,%1 ; jra 2f\n\t"
334 "1: lsrl #1,%2 ; jcc 2f\n\t"
335 "clrw %0@+ ; subqw #2,%1\n\t"
336 "2: movew %1,%2; lsrl #2,%1 ; jeq 6f\n\t"
337 "lsrl #1,%1 ; jcc 3f ; clrl %0@+\n\t"
338 "3: lsrl #1,%1 ; jcc 4f ; clrl %0@+ ; clrl %0@+\n\t"
339 "4: subql #1,%1 ; jcs 6f\n\t"
340 "5: clrl %0@+; clrl %0@+ ; clrl %0@+ ; clrl %0@+\n\t"
341 "dbra %1,5b ; clrw %1; subql #1,%1; jcc 5b\n\t"
342 "6: movew %2,%1; btst #1,%1 ; jeq 7f ; clrw %0@+\n\t"
343 "7: ; btst #0,%1 ; jeq 8f ; clrb %0@+\n\t"
344 "8:"
345 : "=a" (s), "=d" (count), "=d" (tmp)
346 : "" (s), "1" (count)
347 );
348 }
349
350 return(0);
351 }
352
353
354 static __inline__ void *fb_memset255(void *s, size_t count)
355 {
356 if (!count)
357 return(0);
358
359 __asm__ __volatile__(
360 "lsrl #1,%1 ; jcc 1f ; moveb %2,%0@-\n\t"
361 "1: lsrl #1,%1 ; jcc 1f ; movew %2,%0@-\n\t"
362 "1: lsrl #1,%1 ; jcc 1f ; movel %2,%0@-\n\t"
363 "1: lsrl #1,%1 ; jcc 1f ; movel %2,%0@- ; movel %2,%0@-\n\t"
364 "1:"
365 : "=a" (s), "=d" (count)
366 : "d" (-1), "" ((char *)s+count), "1" (count)
367 );
368 __asm__ __volatile__(
369 "subql #1,%1 ; jcs 3f\n\t"
370 "movel %2,%%d4; movel %2,%%d5; movel %2,%%d6\n\t"
371 "2: moveml %2/%%d4/%%d5/%%d6,%0@-\n\t"
372 "dbra %1,2b\n\t"
373 "3:"
374 : "=a" (s), "=d" (count)
375 : "d" (-1), "" (s), "1" (count)
376 : "d4", "d5", "d6"
377 );
378
379 return(0);
380 }
381
382
383 static __inline__ void *fb_memmove(void *d, const void *s, size_t count)
384 {
385 if (d < s) {
386 if (count < 16) {
387 __asm__ __volatile__(
388 "lsrl #1,%2 ; jcc 1f ; moveb %1@+,%0@+\n\t"
389 "1: lsrl #1,%2 ; jcc 1f ; movew %1@+,%0@+\n\t"
390 "1: lsrl #1,%2 ; jcc 1f ; movel %1@+,%0@+\n\t"
391 "1: lsrl #1,%2 ; jcc 1f ; movel %1@+,%0@+ ; movel %1@+,%0@+\n\t"
392 "1:"
393 : "=a" (d), "=a" (s), "=d" (count)
394 : "" (d), "1" (s), "2" (count)
395 );
396 } else {
397 long tmp;
398 __asm__ __volatile__(
399 "movel %0,%3\n\t"
400 "lsrl #1,%3 ; jcc 1f ; moveb %1@+,%0@+ ; subqw #1,%2\n\t"
401 "lsrl #1,%3 ; jcs 2f\n\t" /* %0 increased=>bit 2 switched*/
402 "movew %1@+,%0@+ ; subqw #2,%2 ; jra 2f\n\t"
403 "1: lsrl #1,%3 ; jcc 2f\n\t"
404 "movew %1@+,%0@+ ; subqw #2,%2\n\t"
405 "2: movew %2,%-; lsrl #2,%2 ; jeq 6f\n\t"
406 "lsrl #1,%2 ; jcc 3f ; movel %1@+,%0@+\n\t"
407 "3: lsrl #1,%2 ; jcc 4f ; movel %1@+,%0@+ ; movel %1@+,%0@+\n\t"
408 "4: subql #1,%2 ; jcs 6f\n\t"
409 "5: movel %1@+,%0@+;movel %1@+,%0@+\n\t"
410 "movel %1@+,%0@+;movel %1@+,%0@+\n\t"
411 "dbra %2,5b ; clrw %2; subql #1,%2; jcc 5b\n\t"
412 "6: movew %+,%2; btst #1,%2 ; jeq 7f ; movew %1@+,%0@+\n\t"
413 "7: ; btst #0,%2 ; jeq 8f ; moveb %1@+,%0@+\n\t"
414 "8:"
415 : "=a" (d), "=a" (s), "=d" (count), "=d" (tmp)
416 : "" (d), "1" (s), "2" (count)
417 );
418 }
419 } else {
420 if (count < 16) {
421 __asm__ __volatile__(
422 "lsrl #1,%2 ; jcc 1f ; moveb %1@-,%0@-\n\t"
423 "1: lsrl #1,%2 ; jcc 1f ; movew %1@-,%0@-\n\t"
424 "1: lsrl #1,%2 ; jcc 1f ; movel %1@-,%0@-\n\t"
425 "1: lsrl #1,%2 ; jcc 1f ; movel %1@-,%0@- ; movel %1@-,%0@-\n\t"
426 "1:"
427 : "=a" (d), "=a" (s), "=d" (count)
428 : "" ((char *) d + count), "1" ((char *) s + count), "2" (count)
429 );
430 } else {
431 long tmp;
432 __asm__ __volatile__(
433 "movel %0,%3\n\t"
434 "lsrl #1,%3 ; jcc 1f ; moveb %1@-,%0@- ; subqw #1,%2\n\t"
435 "lsrl #1,%3 ; jcs 2f\n\t" /* %0 increased=>bit 2 switched*/
436 "movew %1@-,%0@- ; subqw #2,%2 ; jra 2f\n\t"
437 "1: lsrl #1,%3 ; jcc 2f\n\t"
438 "movew %1@-,%0@- ; subqw #2,%2\n\t"
439 "2: movew %2,%-; lsrl #2,%2 ; jeq 6f\n\t"
440 "lsrl #1,%2 ; jcc 3f ; movel %1@-,%0@-\n\t"
441 "3: lsrl #1,%2 ; jcc 4f ; movel %1@-,%0@- ; movel %1@-,%0@-\n\t"
442 "4: subql #1,%2 ; jcs 6f\n\t"
443 "5: movel %1@-,%0@-;movel %1@-,%0@-\n\t"
444 "movel %1@-,%0@-;movel %1@-,%0@-\n\t"
445 "dbra %2,5b ; clrw %2; subql #1,%2; jcc 5b\n\t"
446 "6: movew %+,%2; btst #1,%2 ; jeq 7f ; movew %1@-,%0@-\n\t"
447 "7: ; btst #0,%2 ; jeq 8f ; moveb %1@-,%0@-\n\t"
448 "8:"
449 : "=a" (d), "=a" (s), "=d" (count), "=d" (tmp)
450 : "" ((char *) d + count), "1" ((char *) s + count), "2" (count)
451 );
452 }
453 }
454
455 return(0);
456 }
457
458
459 /* ++andreas: Simple and fast version of memmove, assumes size is
460 divisible by 16, suitable for moving the whole screen bitplane */
461 static __inline__ void fast_memmove(char *dst, const char *src, size_t size)
462 {
463 if (!size)
464 return;
465 if (dst < src)
466 __asm__ __volatile__
467 ("1:"
468 " moveml %0@+,%/d0/%/d1/%/a0/%/a1\n"
469 " moveml %/d0/%/d1/%/a0/%/a1,%1@\n"
470 " addql #8,%1; addql #8,%1\n"
471 " dbra %2,1b\n"
472 " clrw %2; subql #1,%2\n"
473 " jcc 1b"
474 : "=a" (src), "=a" (dst), "=d" (size)
475 : "" (src), "1" (dst), "2" (size / 16 - 1)
476 : "d0", "d1", "a0", "a1", "memory");
477 else
478 __asm__ __volatile__
479 ("1:"
480 " subql #8,%0; subql #8,%0\n"
481 " moveml %0@,%/d0/%/d1/%/a0/%/a1\n"
482 " moveml %/d0/%/d1/%/a0/%/a1,%1@-\n"
483 " dbra %2,1b\n"
484 " clrw %2; subql #1,%2\n"
485 " jcc 1b"
486 : "=a" (src), "=a" (dst), "=d" (size)
487 : "" (src + size), "1" (dst + size), "2" (size / 16 - 1)
488 : "d0", "d1", "a0", "a1", "memory");
489 }
490
491 #elif defined(CONFIG_SUN4)
492
493 /* You may think that I'm crazy and that I should use generic
494 routines. No, I'm not: sun4's framebuffer crashes if we std
495 into it, so we cannot use memset. */
496
497 static __inline__ void *sun4_memset(void *s, char val, size_t count)
498 {
499 int i;
500 for(i=0; i<count;i++)
501 ((char *) s) [i] = val;
502 return s;
503 }
504
505 static __inline__ void *fb_memset255(void *s, size_t count)
506 {
507 return sun4_memset(s, 255, count);
508 }
509
510 static __inline__ void *fb_memclear(void *s, size_t count)
511 {
512 return sun4_memset(s, 0, count);
513 }
514
515 static __inline__ void *fb_memclear_small(void *s, size_t count)
516 {
517 return sun4_memset(s, 0, count);
518 }
519
520 /* To be honest, this is slow_memmove :). But sun4 is crappy, so what we can do. */
521 static __inline__ void fast_memmove(void *d, const void *s, size_t count)
522 {
523 int i;
524 if (d<s) {
525 for (i=0; i<count; i++)
526 ((char *) d)[i] = ((char *) s)[i];
527 } else
528 for (i=0; i<count; i++)
529 ((char *) d)[count-i-1] = ((char *) s)[count-i-1];
530 }
531
532 static __inline__ void *fb_memmove(char *dst, const char *src, size_t size)
533 {
534 fast_memmove(dst, src, size);
535 return dst;
536 }
537
538 #else
539
540 static __inline__ void *fb_memclear_small(void *s, size_t count)
541 {
542 char *xs = (char *) s;
543
544 while (count--)
545 fb_writeb(0, xs++);
546
547 return s;
548 }
549
550 static __inline__ void *fb_memclear(void *s, size_t count)
551 {
552 unsigned long xs = (unsigned long) s;
553
554 if (count < 8)
555 goto rest;
556
557 if (xs & 1) {
558 fb_writeb(0, xs++);
559 count--;
560 }
561 if (xs & 2) {
562 fb_writew(0, xs);
563 xs += 2;
564 count -= 2;
565 }
566 while (count > 3) {
567 fb_writel(0, xs);
568 xs += 4;
569 count -= 4;
570 }
571 rest:
572 while (count--)
573 fb_writeb(0, xs++);
574
575 return s;
576 }
577
578 static __inline__ void *fb_memset255(void *s, size_t count)
579 {
580 unsigned long xs = (unsigned long) s;
581
582 if (count < 8)
583 goto rest;
584
585 if (xs & 1) {
586 fb_writeb(0xff, xs++);
587 count--;
588 }
589 if (xs & 2) {
590 fb_writew(0xffff, xs);
591 xs += 2;
592 count -= 2;
593 }
594 while (count > 3) {
595 fb_writel(0xffffffff, xs);
596 xs += 4;
597 count -= 4;
598 }
599 rest:
600 while (count--)
601 fb_writeb(0xff, xs++);
602
603 return s;
604 }
605
606 #if defined(__i386__)
607
608 static __inline__ void fast_memmove(void *d, const void *s, size_t count)
609 {
610 int d0, d1, d2, d3;
611 if (d < s) {
612 __asm__ __volatile__ (
613 "cld\n\t"
614 "shrl $1,%%ecx\n\t"
615 "jnc 1f\n\t"
616 "movsb\n"
617 "1:\tshrl $1,%%ecx\n\t"
618 "jnc 2f\n\t"
619 "movsw\n"
620 "2:\trep\n\t"
621 "movsl"
622 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
623 :""(count),"1"((long)d),"2"((long)s)
624 :"memory");
625 } else {
626 __asm__ __volatile__ (
627 "std\n\t"
628 "shrl $1,%%ecx\n\t"
629 "jnc 1f\n\t"
630 "movb 3(%%esi),%%al\n\t"
631 "movb %%al,3(%%edi)\n\t"
632 "decl %%esi\n\t"
633 "decl %%edi\n"
634 "1:\tshrl $1,%%ecx\n\t"
635 "jnc 2f\n\t"
636 "movw 2(%%esi),%%ax\n\t"
637 "movw %%ax,2(%%edi)\n\t"
638 "decl %%esi\n\t"
639 "decl %%edi\n\t"
640 "decl %%esi\n\t"
641 "decl %%edi\n"
642 "2:\trep\n\t"
643 "movsl\n\t"
644 "cld"
645 : "=&c" (d0), "=&D" (d1), "=&S" (d2), "=&a" (d3)
646 :""(count),"1"(count-4+(long)d),"2"(count-4+(long)s)
647 :"memory");
648 }
649 }
650
651 static __inline__ void *fb_memmove(char *dst, const char *src, size_t size)
652 {
653 fast_memmove(dst, src, size);
654 return dst;
655 }
656
657 #else /* !__i386__ */
658
659 /*
660 * Anyone who'd like to write asm functions for other CPUs?
661 * (Why are these functions better than those from include/asm/string.h?)
662 */
663
664 static __inline__ void *fb_memmove(void *d, const void *s, size_t count)
665 {
666 unsigned long dst, src;
667
668 if (d < s) {
669 dst = (unsigned long) d;
670 src = (unsigned long) s;
671
672 if ((count < 8) || ((dst ^ src) & 3))
673 goto restup;
674
675 if (dst & 1) {
676 fb_writeb(fb_readb(src++), dst++);
677 count--;
678 }
679 if (dst & 2) {
680 fb_writew(fb_readw(src), dst);
681 src += 2;
682 dst += 2;
683 count -= 2;
684 }
685 while (count > 3) {
686 fb_writel(fb_readl(src), dst);
687 src += 4;
688 dst += 4;
689 count -= 4;
690 }
691
692 restup:
693 while (count--)
694 fb_writeb(fb_readb(src++), dst++);
695 } else {
696 dst = (unsigned long) d + count;
697 src = (unsigned long) s + count;
698
699 if ((count < 8) || ((dst ^ src) & 3))
700 goto restdown;
701
702 if (dst & 1) {
703 src--;
704 dst--;
705 count--;
706 fb_writeb(fb_readb(src), dst);
707 }
708 if (dst & 2) {
709 src -= 2;
710 dst -= 2;
711 count -= 2;
712 fb_writew(fb_readw(src), dst);
713 }
714 while (count > 3) {
715 src -= 4;
716 dst -= 4;
717 count -= 4;
718 fb_writel(fb_readl(src), dst);
719 }
720
721 restdown:
722 while (count--) {
723 src--;
724 dst--;
725 fb_writeb(fb_readb(src), dst);
726 }
727 }
728
729 return d;
730 }
731
732 static __inline__ void fast_memmove(char *d, const char *s, size_t count)
733 {
734 unsigned long dst, src;
735
736 if (d < s) {
737 dst = (unsigned long) d;
738 src = (unsigned long) s;
739
740 if ((count < 8) || ((dst ^ src) & 3))
741 goto restup;
742
743 if (dst & 1) {
744 fb_writeb(fb_readb(src++), dst++);
745 count--;
746 }
747 if (dst & 2) {
748 fb_writew(fb_readw(src), dst);
749 src += 2;
750 dst += 2;
751 count -= 2;
752 }
753 while (count > 3) {
754 fb_writel(fb_readl(src), dst);
755 src += 4;
756 dst += 4;
757 count -= 4;
758 }
759
760 restup:
761 while (count--)
762 fb_writeb(fb_readb(src++), dst++);
763 } else {
764 dst = (unsigned long) d + count;
765 src = (unsigned long) s + count;
766
767 if ((count < 8) || ((dst ^ src) & 3))
768 goto restdown;
769
770 if (dst & 1) {
771 src--;
772 dst--;
773 count--;
774 fb_writeb(fb_readb(src), dst);
775 }
776 if (dst & 2) {
777 src -= 2;
778 dst -= 2;
779 count -= 2;
780 fb_writew(fb_readw(src), dst);
781 }
782 while (count > 3) {
783 src -= 4;
784 dst -= 4;
785 count -= 4;
786 fb_writel(fb_readl(src), dst);
787 }
788
789 restdown:
790 while (count--) {
791 src--;
792 dst--;
793 fb_writeb(fb_readb(src), dst);
794 }
795 }
796 }
797
798 #endif /* !__i386__ */
799
800 #endif /* !__mc68000__ */
801
802 #endif /* _VIDEO_FBCON_H */
803
This page was automatically generated by the
LXR engine.
Visit the LXR main site for more
information.