1 #ifndef _M68K_BITOPS_H
2 #define _M68K_BITOPS_H
3 /*
4 * Copyright 1992, Linus Torvalds.
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 _LINUX_BITOPS_H
12 #error only <linux/bitops.h> can be included directly
13 #endif
14
15 #include <linux/compiler.h>
16 #include <asm/barrier.h>
17
18 /*
19 * Bit access functions vary across the ColdFire and 68k families.
20 * So we will break them out here, and then macro in the ones we want.
21 *
22 * ColdFire - supports standard bset/bclr/bchg with register operand only
23 * 68000 - supports standard bset/bclr/bchg with memory operand
24 * >= 68020 - also supports the bfset/bfclr/bfchg instructions
25 *
26 * Although it is possible to use only the bset/bclr/bchg with register
27 * operands on all platforms you end up with larger generated code.
28 * So we use the best form possible on a given platform.
29 */
30
31 static inline void bset_reg_set_bit(int nr, volatile unsigned long *vaddr)
32 {
33 char *p = (char *)vaddr + (nr ^ 31) / 8;
34
35 __asm__ __volatile__ ("bset %1,(%0)"
36 :
37 : "a" (p), "di" (nr & 7)
38 : "memory");
39 }
40
41 static inline void bset_mem_set_bit(int nr, volatile unsigned long *vaddr)
42 {
43 char *p = (char *)vaddr + (nr ^ 31) / 8;
44
45 __asm__ __volatile__ ("bset %1,%0"
46 : "+m" (*p)
47 : "di" (nr & 7));
48 }
49
50 static inline void bfset_mem_set_bit(int nr, volatile unsigned long *vaddr)
51 {
52 __asm__ __volatile__ ("bfset %1{%0:#1}"
53 :
54 : "d" (nr ^ 31), "o" (*vaddr)
55 : "memory");
56 }
57
58 #if defined(CONFIG_COLDFIRE)
59 #define set_bit(nr, vaddr) bset_reg_set_bit(nr, vaddr)
60 #elif defined(CONFIG_CPU_HAS_NO_BITFIELDS)
61 #define set_bit(nr, vaddr) bset_mem_set_bit(nr, vaddr)
62 #else
63 #define set_bit(nr, vaddr) (__builtin_constant_p(nr) ? \
64 bset_mem_set_bit(nr, vaddr) : \
65 bfset_mem_set_bit(nr, vaddr))
66 #endif
67
68 static __always_inline void
69 arch___set_bit(unsigned long nr, volatile unsigned long *addr)
70 {
71 set_bit(nr, addr);
72 }
73
74 static inline void bclr_reg_clear_bit(int nr, volatile unsigned long *vaddr)
75 {
76 char *p = (char *)vaddr + (nr ^ 31) / 8;
77
78 __asm__ __volatile__ ("bclr %1,(%0)"
79 :
80 : "a" (p), "di" (nr & 7)
81 : "memory");
82 }
83
84 static inline void bclr_mem_clear_bit(int nr, volatile unsigned long *vaddr)
85 {
86 char *p = (char *)vaddr + (nr ^ 31) / 8;
87
88 __asm__ __volatile__ ("bclr %1,%0"
89 : "+m" (*p)
90 : "di" (nr & 7));
91 }
92
93 static inline void bfclr_mem_clear_bit(int nr, volatile unsigned long *vaddr)
94 {
95 __asm__ __volatile__ ("bfclr %1{%0:#1}"
96 :
97 : "d" (nr ^ 31), "o" (*vaddr)
98 : "memory");
99 }
100
101 #if defined(CONFIG_COLDFIRE)
102 #define clear_bit(nr, vaddr) bclr_reg_clear_bit(nr, vaddr)
103 #elif defined(CONFIG_CPU_HAS_NO_BITFIELDS)
104 #define clear_bit(nr, vaddr) bclr_mem_clear_bit(nr, vaddr)
105 #else
106 #define clear_bit(nr, vaddr) (__builtin_constant_p(nr) ? \
107 bclr_mem_clear_bit(nr, vaddr) : \
108 bfclr_mem_clear_bit(nr, vaddr))
109 #endif
110
111 static __always_inline void
112 arch___clear_bit(unsigned long nr, volatile unsigned long *addr)
113 {
114 clear_bit(nr, addr);
115 }
116
117 static inline void bchg_reg_change_bit(int nr, volatile unsigned long *vaddr)
118 {
119 char *p = (char *)vaddr + (nr ^ 31) / 8;
120
121 __asm__ __volatile__ ("bchg %1,(%0)"
122 :
123 : "a" (p), "di" (nr & 7)
124 : "memory");
125 }
126
127 static inline void bchg_mem_change_bit(int nr, volatile unsigned long *vaddr)
128 {
129 char *p = (char *)vaddr + (nr ^ 31) / 8;
130
131 __asm__ __volatile__ ("bchg %1,%0"
132 : "+m" (*p)
133 : "di" (nr & 7));
134 }
135
136 static inline void bfchg_mem_change_bit(int nr, volatile unsigned long *vaddr)
137 {
138 __asm__ __volatile__ ("bfchg %1{%0:#1}"
139 :
140 : "d" (nr ^ 31), "o" (*vaddr)
141 : "memory");
142 }
143
144 #if defined(CONFIG_COLDFIRE)
145 #define change_bit(nr, vaddr) bchg_reg_change_bit(nr, vaddr)
146 #elif defined(CONFIG_CPU_HAS_NO_BITFIELDS)
147 #define change_bit(nr, vaddr) bchg_mem_change_bit(nr, vaddr)
148 #else
149 #define change_bit(nr, vaddr) (__builtin_constant_p(nr) ? \
150 bchg_mem_change_bit(nr, vaddr) : \
151 bfchg_mem_change_bit(nr, vaddr))
152 #endif
153
154 static __always_inline void
155 arch___change_bit(unsigned long nr, volatile unsigned long *addr)
156 {
157 change_bit(nr, addr);
158 }
159
160 #define arch_test_bit generic_test_bit
161 #define arch_test_bit_acquire generic_test_bit_acquire
162
163 static inline int bset_reg_test_and_set_bit(int nr,
164 volatile unsigned long *vaddr)
165 {
166 char *p = (char *)vaddr + (nr ^ 31) / 8;
167 char retval;
168
169 __asm__ __volatile__ ("bset %2,(%1); sne %0"
170 : "=d" (retval)
171 : "a" (p), "di" (nr & 7)
172 : "memory");
173 return retval;
174 }
175
176 static inline int bset_mem_test_and_set_bit(int nr,
177 volatile unsigned long *vaddr)
178 {
179 char *p = (char *)vaddr + (nr ^ 31) / 8;
180 char retval;
181
182 __asm__ __volatile__ ("bset %2,%1; sne %0"
183 : "=d" (retval), "+m" (*p)
184 : "di" (nr & 7));
185 return retval;
186 }
187
188 static inline int bfset_mem_test_and_set_bit(int nr,
189 volatile unsigned long *vaddr)
190 {
191 char retval;
192
193 __asm__ __volatile__ ("bfset %2{%1:#1}; sne %0"
194 : "=d" (retval)
195 : "d" (nr ^ 31), "o" (*vaddr)
196 : "memory");
197 return retval;
198 }
199
200 #if defined(CONFIG_COLDFIRE)
201 #define test_and_set_bit(nr, vaddr) bset_reg_test_and_set_bit(nr, vaddr)
202 #elif defined(CONFIG_CPU_HAS_NO_BITFIELDS)
203 #define test_and_set_bit(nr, vaddr) bset_mem_test_and_set_bit(nr, vaddr)
204 #else
205 #define test_and_set_bit(nr, vaddr) (__builtin_constant_p(nr) ? \
206 bset_mem_test_and_set_bit(nr, vaddr) : \
207 bfset_mem_test_and_set_bit(nr, vaddr))
208 #endif
209
210 static __always_inline bool
211 arch___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
212 {
213 return test_and_set_bit(nr, addr);
214 }
215
216 static inline int bclr_reg_test_and_clear_bit(int nr,
217 volatile unsigned long *vaddr)
218 {
219 char *p = (char *)vaddr + (nr ^ 31) / 8;
220 char retval;
221
222 __asm__ __volatile__ ("bclr %2,(%1); sne %0"
223 : "=d" (retval)
224 : "a" (p), "di" (nr & 7)
225 : "memory");
226 return retval;
227 }
228
229 static inline int bclr_mem_test_and_clear_bit(int nr,
230 volatile unsigned long *vaddr)
231 {
232 char *p = (char *)vaddr + (nr ^ 31) / 8;
233 char retval;
234
235 __asm__ __volatile__ ("bclr %2,%1; sne %0"
236 : "=d" (retval), "+m" (*p)
237 : "di" (nr & 7));
238 return retval;
239 }
240
241 static inline int bfclr_mem_test_and_clear_bit(int nr,
242 volatile unsigned long *vaddr)
243 {
244 char retval;
245
246 __asm__ __volatile__ ("bfclr %2{%1:#1}; sne %0"
247 : "=d" (retval)
248 : "d" (nr ^ 31), "o" (*vaddr)
249 : "memory");
250 return retval;
251 }
252
253 #if defined(CONFIG_COLDFIRE)
254 #define test_and_clear_bit(nr, vaddr) bclr_reg_test_and_clear_bit(nr, vaddr)
255 #elif defined(CONFIG_CPU_HAS_NO_BITFIELDS)
256 #define test_and_clear_bit(nr, vaddr) bclr_mem_test_and_clear_bit(nr, vaddr)
257 #else
258 #define test_and_clear_bit(nr, vaddr) (__builtin_constant_p(nr) ? \
259 bclr_mem_test_and_clear_bit(nr, vaddr) : \
260 bfclr_mem_test_and_clear_bit(nr, vaddr))
261 #endif
262
263 static __always_inline bool
264 arch___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
265 {
266 return test_and_clear_bit(nr, addr);
267 }
268
269 static inline int bchg_reg_test_and_change_bit(int nr,
270 volatile unsigned long *vaddr)
271 {
272 char *p = (char *)vaddr + (nr ^ 31) / 8;
273 char retval;
274
275 __asm__ __volatile__ ("bchg %2,(%1); sne %0"
276 : "=d" (retval)
277 : "a" (p), "di" (nr & 7)
278 : "memory");
279 return retval;
280 }
281
282 static inline int bchg_mem_test_and_change_bit(int nr,
283 volatile unsigned long *vaddr)
284 {
285 char *p = (char *)vaddr + (nr ^ 31) / 8;
286 char retval;
287
288 __asm__ __volatile__ ("bchg %2,%1; sne %0"
289 : "=d" (retval), "+m" (*p)
290 : "di" (nr & 7));
291 return retval;
292 }
293
294 static inline int bfchg_mem_test_and_change_bit(int nr,
295 volatile unsigned long *vaddr)
296 {
297 char retval;
298
299 __asm__ __volatile__ ("bfchg %2{%1:#1}; sne %0"
300 : "=d" (retval)
301 : "d" (nr ^ 31), "o" (*vaddr)
302 : "memory");
303 return retval;
304 }
305
306 #if defined(CONFIG_COLDFIRE)
307 #define test_and_change_bit(nr, vaddr) bchg_reg_test_and_change_bit(nr, vaddr)
308 #elif defined(CONFIG_CPU_HAS_NO_BITFIELDS)
309 #define test_and_change_bit(nr, vaddr) bchg_mem_test_and_change_bit(nr, vaddr)
310 #else
311 #define test_and_change_bit(nr, vaddr) (__builtin_constant_p(nr) ? \
312 bchg_mem_test_and_change_bit(nr, vaddr) : \
313 bfchg_mem_test_and_change_bit(nr, vaddr))
314 #endif
315
316 static __always_inline bool
317 arch___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
318 {
319 return test_and_change_bit(nr, addr);
320 }
321
322 static inline bool xor_unlock_is_negative_byte(unsigned long mask,
323 volatile unsigned long *p)
324 {
325 #ifdef CONFIG_COLDFIRE
326 __asm__ __volatile__ ("eorl %1, %0"
327 : "+m" (*p)
328 : "d" (mask)
329 : "memory");
330 return *p & (1 << 7);
331 #else
332 char result;
333 char *cp = (char *)p + 3; /* m68k is big-endian */
334
335 __asm__ __volatile__ ("eor.b %1, %2; smi %0"
336 : "=d" (result)
337 : "di" (mask), "o" (*cp)
338 : "memory");
339 return result;
340 #endif
341 }
342
343 /*
344 * The true 68020 and more advanced processors support the "bfffo"
345 * instruction for finding bits. ColdFire and simple 68000 parts
346 * (including CPU32) do not support this. They simply use the generic
347 * functions.
348 */
349 #if defined(CONFIG_CPU_HAS_NO_BITFIELDS)
350 #include <asm-generic/bitops/ffz.h>
351 #else
352
353 static inline int find_first_zero_bit(const unsigned long *vaddr,
354 unsigned size)
355 {
356 const unsigned long *p = vaddr;
357 int res = 32;
358 unsigned int words;
359 unsigned long num;
360
361 if (!size)
362 return 0;
363
364 words = (size + 31) >> 5;
365 while (!(num = ~*p++)) {
366 if (!--words)
367 goto out;
368 }
369
370 __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
371 : "=d" (res) : "d" (num & -num));
372 res ^= 31;
373 out:
374 res += ((long)p - (long)vaddr - 4) * 8;
375 return res < size ? res : size;
376 }
377 #define find_first_zero_bit find_first_zero_bit
378
379 static inline int find_next_zero_bit(const unsigned long *vaddr, int size,
380 int offset)
381 {
382 const unsigned long *p = vaddr + (offset >> 5);
383 int bit = offset & 31UL, res;
384
385 if (offset >= size)
386 return size;
387
388 if (bit) {
389 unsigned long num = ~*p++ & (~0UL << bit);
390 offset -= bit;
391
392 /* Look for zero in first longword */
393 __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
394 : "=d" (res) : "d" (num & -num));
395 if (res < 32) {
396 offset += res ^ 31;
397 return offset < size ? offset : size;
398 }
399 offset += 32;
400
401 if (offset >= size)
402 return size;
403 }
404 /* No zero yet, search remaining full bytes for a zero */
405 return offset + find_first_zero_bit(p, size - offset);
406 }
407 #define find_next_zero_bit find_next_zero_bit
408
409 static inline int find_first_bit(const unsigned long *vaddr, unsigned size)
410 {
411 const unsigned long *p = vaddr;
412 int res = 32;
413 unsigned int words;
414 unsigned long num;
415
416 if (!size)
417 return 0;
418
419 words = (size + 31) >> 5;
420 while (!(num = *p++)) {
421 if (!--words)
422 goto out;
423 }
424
425 __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
426 : "=d" (res) : "d" (num & -num));
427 res ^= 31;
428 out:
429 res += ((long)p - (long)vaddr - 4) * 8;
430 return res < size ? res : size;
431 }
432 #define find_first_bit find_first_bit
433
434 static inline int find_next_bit(const unsigned long *vaddr, int size,
435 int offset)
436 {
437 const unsigned long *p = vaddr + (offset >> 5);
438 int bit = offset & 31UL, res;
439
440 if (offset >= size)
441 return size;
442
443 if (bit) {
444 unsigned long num = *p++ & (~0UL << bit);
445 offset -= bit;
446
447 /* Look for one in first longword */
448 __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
449 : "=d" (res) : "d" (num & -num));
450 if (res < 32) {
451 offset += res ^ 31;
452 return offset < size ? offset : size;
453 }
454 offset += 32;
455
456 if (offset >= size)
457 return size;
458 }
459 /* No one yet, search remaining full bytes for a one */
460 return offset + find_first_bit(p, size - offset);
461 }
462 #define find_next_bit find_next_bit
463
464 /*
465 * ffz = Find First Zero in word. Undefined if no zero exists,
466 * so code should check against ~0UL first..
467 */
468 static inline unsigned long ffz(unsigned long word)
469 {
470 int res;
471
472 __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
473 : "=d" (res) : "d" (~word & -~word));
474 return res ^ 31;
475 }
476
477 #endif
478
479 #ifdef __KERNEL__
480
481 #if defined(CONFIG_CPU_HAS_NO_BITFIELDS)
482
483 /*
484 * The newer ColdFire family members support a "bitrev" instruction
485 * and we can use that to implement a fast ffs. Older Coldfire parts,
486 * and normal 68000 parts don't have anything special, so we use the
487 * generic functions for those.
488 */
489 #if (defined(__mcfisaaplus__) || defined(__mcfisac__)) && \
490 !defined(CONFIG_M68000)
491 static inline unsigned long __ffs(unsigned long x)
492 {
493 __asm__ __volatile__ ("bitrev %0; ff1 %0"
494 : "=d" (x)
495 : "" (x));
496 return x;
497 }
498
499 static inline int ffs(int x)
500 {
501 if (!x)
502 return 0;
503 return __ffs(x) + 1;
504 }
505
506 #else
507 #include <asm-generic/bitops/ffs.h>
508 #include <asm-generic/bitops/__ffs.h>
509 #endif
510
511 #include <asm-generic/bitops/fls.h>
512 #include <asm-generic/bitops/__fls.h>
513
514 #else
515
516 /*
517 * ffs: find first bit set. This is defined the same way as
518 * the libc and compiler builtin ffs routines, therefore
519 * differs in spirit from the above ffz (man ffs).
520 */
521 static inline int ffs(int x)
522 {
523 int cnt;
524
525 __asm__ ("bfffo %1{#0:#0},%0"
526 : "=d" (cnt)
527 : "dm" (x & -x));
528 return 32 - cnt;
529 }
530
531 static inline unsigned long __ffs(unsigned long x)
532 {
533 return ffs(x) - 1;
534 }
535
536 /*
537 * fls: find last bit set.
538 */
539 static inline int fls(unsigned int x)
540 {
541 int cnt;
542
543 __asm__ ("bfffo %1{#0,#0},%0"
544 : "=d" (cnt)
545 : "dm" (x));
546 return 32 - cnt;
547 }
548
549 static inline unsigned long __fls(unsigned long x)
550 {
551 return fls(x) - 1;
552 }
553
554 #endif
555
556 /* Simple test-and-set bit locks */
557 #define test_and_set_bit_lock test_and_set_bit
558 #define clear_bit_unlock clear_bit
559 #define __clear_bit_unlock clear_bit_unlock
560
561 #include <asm-generic/bitops/non-instrumented-non-atomic.h>
562 #include <asm-generic/bitops/ext2-atomic.h>
563 #include <asm-generic/bitops/fls64.h>
564 #include <asm-generic/bitops/sched.h>
565 #include <asm-generic/bitops/hweight.h>
566 #include <asm-generic/bitops/le.h>
567 #endif /* __KERNEL__ */
568
569 #endif /* _M68K_BITOPS_H */
570
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