1 #ifndef _VIDEO_ATAFB_UTILS_H
2 #define _VIDEO_ATAFB_UTILS_H
3
4 /* ================================================================= */
5 /* Utility Assembler Functions */
6 /* ================================================================= */
7
8 /* ====================================================================== */
9
10 /* Those of a delicate disposition might like to skip the next couple of
11 * pages.
12 *
13 * These functions are drop in replacements for memmove and
14 * memset(_, 0, _). However their five instances add at least a kilobyte
15 * to the object file. You have been warned.
16 *
17 * Not a great fan of assembler for the sake of it, but I think
18 * that these routines are at least 10 times faster than their C
19 * equivalents for large blits, and that's important to the lowest level of
20 * a graphics driver. Question is whether some scheme with the blitter
21 * would be faster. I suspect not for simple text system - not much
22 * asynchrony.
23 *
24 * Code is very simple, just gruesome expansion. Basic strategy is to
25 * increase data moved/cleared at each step to 16 bytes to reduce
26 * instruction per data move overhead. movem might be faster still
27 * For more than 15 bytes, we try to align the write direction on a
28 * longword boundary to get maximum speed. This is even more gruesome.
29 * Unaligned read/write used requires 68020+ - think this is a problem?
30 *
31 * Sorry!
32 */
33
34
35 /* ++roman: I've optimized Robert's original versions in some minor
36 * aspects, e.g. moveq instead of movel, let gcc choose the registers,
37 * use movem in some places...
38 * For other modes than 1 plane, lots of more such assembler functions
39 * were needed (e.g. the ones using movep or expanding color values).
40 */
41
42 /* ++andreas: more optimizations:
43 subl #65536,d0 replaced by clrw d0; subql #1,d0 for dbcc
44 addal is faster than addaw
45 movep is rather expensive compared to ordinary move's
46 some functions rewritten in C for clarity, no speed loss */
47
fb_memclear_small(void * s,size_t count)48 static inline void *fb_memclear_small(void *s, size_t count)
49 {
50 if (!count)
51 return 0;
52
53 asm volatile ("\n"
54 " lsr.l #1,%1 ; jcc 1f ; move.b %2,-(%0)\n"
55 "1: lsr.l #1,%1 ; jcc 1f ; move.w %2,-(%0)\n"
56 "1: lsr.l #1,%1 ; jcc 1f ; move.l %2,-(%0)\n"
57 "1: lsr.l #1,%1 ; jcc 1f ; move.l %2,-(%0) ; move.l %2,-(%0)\n"
58 "1:"
59 : "=a" (s), "=d" (count)
60 : "d" (0), "0" ((char *)s + count), "1" (count));
61 asm volatile ("\n"
62 " subq.l #1,%1\n"
63 " jcs 3f\n"
64 " move.l %2,%%d4; move.l %2,%%d5; move.l %2,%%d6\n"
65 "2: movem.l %2/%%d4/%%d5/%%d6,-(%0)\n"
66 " dbra %1,2b\n"
67 "3:"
68 : "=a" (s), "=d" (count)
69 : "d" (0), "0" (s), "1" (count)
70 : "d4", "d5", "d6"
71 );
72
73 return 0;
74 }
75
76
fb_memclear(void * s,size_t count)77 static inline void *fb_memclear(void *s, size_t count)
78 {
79 if (!count)
80 return 0;
81
82 if (count < 16) {
83 asm volatile ("\n"
84 " lsr.l #1,%1 ; jcc 1f ; clr.b (%0)+\n"
85 "1: lsr.l #1,%1 ; jcc 1f ; clr.w (%0)+\n"
86 "1: lsr.l #1,%1 ; jcc 1f ; clr.l (%0)+\n"
87 "1: lsr.l #1,%1 ; jcc 1f ; clr.l (%0)+ ; clr.l (%0)+\n"
88 "1:"
89 : "=a" (s), "=d" (count)
90 : "0" (s), "1" (count));
91 } else {
92 long tmp;
93 asm volatile ("\n"
94 " move.l %1,%2\n"
95 " lsr.l #1,%2 ; jcc 1f ; clr.b (%0)+ ; subq.w #1,%1\n"
96 " lsr.l #1,%2 ; jcs 2f\n" /* %0 increased=>bit 2 switched*/
97 " clr.w (%0)+ ; subq.w #2,%1 ; jra 2f\n"
98 "1: lsr.l #1,%2 ; jcc 2f\n"
99 " clr.w (%0)+ ; subq.w #2,%1\n"
100 "2: move.w %1,%2; lsr.l #2,%1 ; jeq 6f\n"
101 " lsr.l #1,%1 ; jcc 3f ; clr.l (%0)+\n"
102 "3: lsr.l #1,%1 ; jcc 4f ; clr.l (%0)+ ; clr.l (%0)+\n"
103 "4: subq.l #1,%1 ; jcs 6f\n"
104 "5: clr.l (%0)+; clr.l (%0)+ ; clr.l (%0)+ ; clr.l (%0)+\n"
105 " dbra %1,5b ; clr.w %1; subq.l #1,%1; jcc 5b\n"
106 "6: move.w %2,%1; btst #1,%1 ; jeq 7f ; clr.w (%0)+\n"
107 "7: btst #0,%1 ; jeq 8f ; clr.b (%0)+\n"
108 "8:"
109 : "=a" (s), "=d" (count), "=d" (tmp)
110 : "0" (s), "1" (count));
111 }
112
113 return 0;
114 }
115
116
fb_memset255(void * s,size_t count)117 static inline void *fb_memset255(void *s, size_t count)
118 {
119 if (!count)
120 return 0;
121
122 asm volatile ("\n"
123 " lsr.l #1,%1 ; jcc 1f ; move.b %2,-(%0)\n"
124 "1: lsr.l #1,%1 ; jcc 1f ; move.w %2,-(%0)\n"
125 "1: lsr.l #1,%1 ; jcc 1f ; move.l %2,-(%0)\n"
126 "1: lsr.l #1,%1 ; jcc 1f ; move.l %2,-(%0) ; move.l %2,-(%0)\n"
127 "1:"
128 : "=a" (s), "=d" (count)
129 : "d" (-1), "0" ((char *)s+count), "1" (count));
130 asm volatile ("\n"
131 " subq.l #1,%1 ; jcs 3f\n"
132 " move.l %2,%%d4; move.l %2,%%d5; move.l %2,%%d6\n"
133 "2: movem.l %2/%%d4/%%d5/%%d6,-(%0)\n"
134 " dbra %1,2b\n"
135 "3:"
136 : "=a" (s), "=d" (count)
137 : "d" (-1), "0" (s), "1" (count)
138 : "d4", "d5", "d6");
139
140 return 0;
141 }
142
143
fb_memmove(void * d,const void * s,size_t count)144 static inline void *fb_memmove(void *d, const void *s, size_t count)
145 {
146 if (d < s) {
147 if (count < 16) {
148 asm volatile ("\n"
149 " lsr.l #1,%2 ; jcc 1f ; move.b (%1)+,(%0)+\n"
150 "1: lsr.l #1,%2 ; jcc 1f ; move.w (%1)+,(%0)+\n"
151 "1: lsr.l #1,%2 ; jcc 1f ; move.l (%1)+,(%0)+\n"
152 "1: lsr.l #1,%2 ; jcc 1f ; move.l (%1)+,(%0)+ ; move.l (%1)+,(%0)+\n"
153 "1:"
154 : "=a" (d), "=a" (s), "=d" (count)
155 : "0" (d), "1" (s), "2" (count));
156 } else {
157 long tmp;
158 asm volatile ("\n"
159 " move.l %0,%3\n"
160 " lsr.l #1,%3 ; jcc 1f ; move.b (%1)+,(%0)+ ; subqw #1,%2\n"
161 " lsr.l #1,%3 ; jcs 2f\n" /* %0 increased=>bit 2 switched*/
162 " move.w (%1)+,(%0)+ ; subqw #2,%2 ; jra 2f\n"
163 "1: lsr.l #1,%3 ; jcc 2f\n"
164 " move.w (%1)+,(%0)+ ; subqw #2,%2\n"
165 "2: move.w %2,%-; lsr.l #2,%2 ; jeq 6f\n"
166 " lsr.l #1,%2 ; jcc 3f ; move.l (%1)+,(%0)+\n"
167 "3: lsr.l #1,%2 ; jcc 4f ; move.l (%1)+,(%0)+ ; move.l (%1)+,(%0)+\n"
168 "4: subq.l #1,%2 ; jcs 6f\n"
169 "5: move.l (%1)+,(%0)+; move.l (%1)+,(%0)+\n"
170 " move.l (%1)+,(%0)+; move.l (%1)+,(%0)+\n"
171 " dbra %2,5b ; clr.w %2; subq.l #1,%2; jcc 5b\n"
172 "6: move.w %+,%2; btst #1,%2 ; jeq 7f ; move.w (%1)+,(%0)+\n"
173 "7: btst #0,%2 ; jeq 8f ; move.b (%1)+,(%0)+\n"
174 "8:"
175 : "=a" (d), "=a" (s), "=d" (count), "=d" (tmp)
176 : "0" (d), "1" (s), "2" (count));
177 }
178 } else {
179 if (count < 16) {
180 asm volatile ("\n"
181 " lsr.l #1,%2 ; jcc 1f ; move.b -(%1),-(%0)\n"
182 "1: lsr.l #1,%2 ; jcc 1f ; move.w -(%1),-(%0)\n"
183 "1: lsr.l #1,%2 ; jcc 1f ; move.l -(%1),-(%0)\n"
184 "1: lsr.l #1,%2 ; jcc 1f ; move.l -(%1),-(%0) ; move.l -(%1),-(%0)\n"
185 "1:"
186 : "=a" (d), "=a" (s), "=d" (count)
187 : "0" ((char *) d + count), "1" ((char *) s + count), "2" (count));
188 } else {
189 long tmp;
190
191 asm volatile ("\n"
192 " move.l %0,%3\n"
193 " lsr.l #1,%3 ; jcc 1f ; move.b -(%1),-(%0) ; subqw #1,%2\n"
194 " lsr.l #1,%3 ; jcs 2f\n" /* %0 increased=>bit 2 switched*/
195 " move.w -(%1),-(%0) ; subqw #2,%2 ; jra 2f\n"
196 "1: lsr.l #1,%3 ; jcc 2f\n"
197 " move.w -(%1),-(%0) ; subqw #2,%2\n"
198 "2: move.w %2,%-; lsr.l #2,%2 ; jeq 6f\n"
199 " lsr.l #1,%2 ; jcc 3f ; move.l -(%1),-(%0)\n"
200 "3: lsr.l #1,%2 ; jcc 4f ; move.l -(%1),-(%0) ; move.l -(%1),-(%0)\n"
201 "4: subq.l #1,%2 ; jcs 6f\n"
202 "5: move.l -(%1),-(%0); move.l -(%1),-(%0)\n"
203 " move.l -(%1),-(%0); move.l -(%1),-(%0)\n"
204 " dbra %2,5b ; clr.w %2; subq.l #1,%2; jcc 5b\n"
205 "6: move.w %+,%2; btst #1,%2 ; jeq 7f ; move.w -(%1),-(%0)\n"
206 "7: btst #0,%2 ; jeq 8f ; move.b -(%1),-(%0)\n"
207 "8:"
208 : "=a" (d), "=a" (s), "=d" (count), "=d" (tmp)
209 : "0" ((char *) d + count), "1" ((char *) s + count), "2" (count));
210 }
211 }
212
213 return 0;
214 }
215
216
217 /* ++andreas: Simple and fast version of memmove, assumes size is
218 divisible by 16, suitable for moving the whole screen bitplane */
fast_memmove(char * dst,const char * src,size_t size)219 static inline void fast_memmove(char *dst, const char *src, size_t size)
220 {
221 if (!size)
222 return;
223 if (dst < src)
224 asm volatile ("\n"
225 "1: movem.l (%0)+,%%d0/%%d1/%%a0/%%a1\n"
226 " movem.l %%d0/%%d1/%%a0/%%a1,%1@\n"
227 " addq.l #8,%1; addq.l #8,%1\n"
228 " dbra %2,1b\n"
229 " clr.w %2; subq.l #1,%2\n"
230 " jcc 1b"
231 : "=a" (src), "=a" (dst), "=d" (size)
232 : "0" (src), "1" (dst), "2" (size / 16 - 1)
233 : "d0", "d1", "a0", "a1", "memory");
234 else
235 asm volatile ("\n"
236 "1: subq.l #8,%0; subq.l #8,%0\n"
237 " movem.l %0@,%%d0/%%d1/%%a0/%%a1\n"
238 " movem.l %%d0/%%d1/%%a0/%%a1,-(%1)\n"
239 " dbra %2,1b\n"
240 " clr.w %2; subq.l #1,%2\n"
241 " jcc 1b"
242 : "=a" (src), "=a" (dst), "=d" (size)
243 : "0" (src + size), "1" (dst + size), "2" (size / 16 - 1)
244 : "d0", "d1", "a0", "a1", "memory");
245 }
246
247 #ifdef BPL
248
249 /*
250 * This expands a up to 8 bit color into two longs
251 * for movel operations.
252 */
253 static const u32 four2long[] = {
254 0x00000000, 0x000000ff, 0x0000ff00, 0x0000ffff,
255 0x00ff0000, 0x00ff00ff, 0x00ffff00, 0x00ffffff,
256 0xff000000, 0xff0000ff, 0xff00ff00, 0xff00ffff,
257 0xffff0000, 0xffff00ff, 0xffffff00, 0xffffffff,
258 };
259
expand8_col2mask(u8 c,u32 m[])260 static inline void expand8_col2mask(u8 c, u32 m[])
261 {
262 m[0] = four2long[c & 15];
263 #if BPL > 4
264 m[1] = four2long[c >> 4];
265 #endif
266 }
267
expand8_2col2mask(u8 fg,u8 bg,u32 fgm[],u32 bgm[])268 static inline void expand8_2col2mask(u8 fg, u8 bg, u32 fgm[], u32 bgm[])
269 {
270 fgm[0] = four2long[fg & 15] ^ (bgm[0] = four2long[bg & 15]);
271 #if BPL > 4
272 fgm[1] = four2long[fg >> 4] ^ (bgm[1] = four2long[bg >> 4]);
273 #endif
274 }
275
276 /*
277 * set an 8bit value to a color
278 */
fill8_col(u8 * dst,u32 m[])279 static inline void fill8_col(u8 *dst, u32 m[])
280 {
281 u32 tmp = m[0];
282 dst[0] = tmp;
283 dst[2] = (tmp >>= 8);
284 #if BPL > 2
285 dst[4] = (tmp >>= 8);
286 dst[6] = tmp >> 8;
287 #endif
288 #if BPL > 4
289 tmp = m[1];
290 dst[8] = tmp;
291 dst[10] = (tmp >>= 8);
292 dst[12] = (tmp >>= 8);
293 dst[14] = tmp >> 8;
294 #endif
295 }
296
297 /*
298 * set an 8bit value according to foreground/background color
299 */
fill8_2col(u8 * dst,u8 fg,u8 bg,u32 mask)300 static inline void fill8_2col(u8 *dst, u8 fg, u8 bg, u32 mask)
301 {
302 u32 fgm[2], bgm[2], tmp;
303
304 expand8_2col2mask(fg, bg, fgm, bgm);
305
306 mask |= mask << 8;
307 #if BPL > 2
308 mask |= mask << 16;
309 #endif
310 tmp = (mask & fgm[0]) ^ bgm[0];
311 dst[0] = tmp;
312 dst[2] = (tmp >>= 8);
313 #if BPL > 2
314 dst[4] = (tmp >>= 8);
315 dst[6] = tmp >> 8;
316 #endif
317 #if BPL > 4
318 tmp = (mask & fgm[1]) ^ bgm[1];
319 dst[8] = tmp;
320 dst[10] = (tmp >>= 8);
321 dst[12] = (tmp >>= 8);
322 dst[14] = tmp >> 8;
323 #endif
324 }
325
326 static const u32 two2word[] = {
327 0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
328 };
329
expand16_col2mask(u8 c,u32 m[])330 static inline void expand16_col2mask(u8 c, u32 m[])
331 {
332 m[0] = two2word[c & 3];
333 #if BPL > 2
334 m[1] = two2word[(c >> 2) & 3];
335 #endif
336 #if BPL > 4
337 m[2] = two2word[(c >> 4) & 3];
338 m[3] = two2word[c >> 6];
339 #endif
340 }
341
expand16_2col2mask(u8 fg,u8 bg,u32 fgm[],u32 bgm[])342 static inline void expand16_2col2mask(u8 fg, u8 bg, u32 fgm[], u32 bgm[])
343 {
344 bgm[0] = two2word[bg & 3];
345 fgm[0] = two2word[fg & 3] ^ bgm[0];
346 #if BPL > 2
347 bgm[1] = two2word[(bg >> 2) & 3];
348 fgm[1] = two2word[(fg >> 2) & 3] ^ bgm[1];
349 #endif
350 #if BPL > 4
351 bgm[2] = two2word[(bg >> 4) & 3];
352 fgm[2] = two2word[(fg >> 4) & 3] ^ bgm[2];
353 bgm[3] = two2word[bg >> 6];
354 fgm[3] = two2word[fg >> 6] ^ bgm[3];
355 #endif
356 }
357
fill16_col(u32 * dst,int rows,u32 m[])358 static inline u32 *fill16_col(u32 *dst, int rows, u32 m[])
359 {
360 while (rows) {
361 *dst++ = m[0];
362 #if BPL > 2
363 *dst++ = m[1];
364 #endif
365 #if BPL > 4
366 *dst++ = m[2];
367 *dst++ = m[3];
368 #endif
369 rows--;
370 }
371 return dst;
372 }
373
memmove32_col(void * dst,void * src,u32 mask,u32 h,u32 bytes)374 static inline void memmove32_col(void *dst, void *src, u32 mask, u32 h, u32 bytes)
375 {
376 u32 *s, *d, v;
377
378 s = src;
379 d = dst;
380 do {
381 v = (*s++ & mask) | (*d & ~mask);
382 *d++ = v;
383 #if BPL > 2
384 v = (*s++ & mask) | (*d & ~mask);
385 *d++ = v;
386 #endif
387 #if BPL > 4
388 v = (*s++ & mask) | (*d & ~mask);
389 *d++ = v;
390 v = (*s++ & mask) | (*d & ~mask);
391 *d++ = v;
392 #endif
393 d = (u32 *)((u8 *)d + bytes);
394 s = (u32 *)((u8 *)s + bytes);
395 } while (--h);
396 }
397
398 #endif
399
400 #endif /* _VIDEO_ATAFB_UTILS_H */
401