4 * Copyright 1992, Linus Torvalds.
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
11 #ifndef _LINUX_BITOPS_H
12 #error only <linux/bitops.h> can be included directly
15 #include <linux/compiler.h>
16 #include <asm/barrier.h>
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.
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
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.
31 static inline void bset_reg_set_bit(int nr, volatile unsigned long *vaddr)
33 char *p = (char *)vaddr + (nr ^ 31) / 8;
35 __asm__ __volatile__ ("bset %1,(%0)"
37 : "a" (p), "di" (nr & 7)
41 static inline void bset_mem_set_bit(int nr, volatile unsigned long *vaddr)
43 char *p = (char *)vaddr + (nr ^ 31) / 8;
45 __asm__ __volatile__ ("bset %1,%0"
50 static inline void bfset_mem_set_bit(int nr, volatile unsigned long *vaddr)
52 __asm__ __volatile__ ("bfset %1{%0:#1}"
54 : "d" (nr ^ 31), "o" (*vaddr)
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)
63 #define set_bit(nr, vaddr) (__builtin_constant_p(nr) ? \
64 bset_mem_set_bit(nr, vaddr) : \
65 bfset_mem_set_bit(nr, vaddr))
68 #define __set_bit(nr, vaddr) set_bit(nr, vaddr)
71 static inline void bclr_reg_clear_bit(int nr, volatile unsigned long *vaddr)
73 char *p = (char *)vaddr + (nr ^ 31) / 8;
75 __asm__ __volatile__ ("bclr %1,(%0)"
77 : "a" (p), "di" (nr & 7)
81 static inline void bclr_mem_clear_bit(int nr, volatile unsigned long *vaddr)
83 char *p = (char *)vaddr + (nr ^ 31) / 8;
85 __asm__ __volatile__ ("bclr %1,%0"
90 static inline void bfclr_mem_clear_bit(int nr, volatile unsigned long *vaddr)
92 __asm__ __volatile__ ("bfclr %1{%0:#1}"
94 : "d" (nr ^ 31), "o" (*vaddr)
98 #if defined(CONFIG_COLDFIRE)
99 #define clear_bit(nr, vaddr) bclr_reg_clear_bit(nr, vaddr)
100 #elif defined(CONFIG_CPU_HAS_NO_BITFIELDS)
101 #define clear_bit(nr, vaddr) bclr_mem_clear_bit(nr, vaddr)
103 #define clear_bit(nr, vaddr) (__builtin_constant_p(nr) ? \
104 bclr_mem_clear_bit(nr, vaddr) : \
105 bfclr_mem_clear_bit(nr, vaddr))
108 #define __clear_bit(nr, vaddr) clear_bit(nr, vaddr)
111 static inline void bchg_reg_change_bit(int nr, volatile unsigned long *vaddr)
113 char *p = (char *)vaddr + (nr ^ 31) / 8;
115 __asm__ __volatile__ ("bchg %1,(%0)"
117 : "a" (p), "di" (nr & 7)
121 static inline void bchg_mem_change_bit(int nr, volatile unsigned long *vaddr)
123 char *p = (char *)vaddr + (nr ^ 31) / 8;
125 __asm__ __volatile__ ("bchg %1,%0"
130 static inline void bfchg_mem_change_bit(int nr, volatile unsigned long *vaddr)
132 __asm__ __volatile__ ("bfchg %1{%0:#1}"
134 : "d" (nr ^ 31), "o" (*vaddr)
138 #if defined(CONFIG_COLDFIRE)
139 #define change_bit(nr, vaddr) bchg_reg_change_bit(nr, vaddr)
140 #elif defined(CONFIG_CPU_HAS_NO_BITFIELDS)
141 #define change_bit(nr, vaddr) bchg_mem_change_bit(nr, vaddr)
143 #define change_bit(nr, vaddr) (__builtin_constant_p(nr) ? \
144 bchg_mem_change_bit(nr, vaddr) : \
145 bfchg_mem_change_bit(nr, vaddr))
148 #define __change_bit(nr, vaddr) change_bit(nr, vaddr)
151 static inline int test_bit(int nr, const unsigned long *vaddr)
153 return (vaddr[nr >> 5] & (1UL << (nr & 31))) != 0;
157 static inline int bset_reg_test_and_set_bit(int nr,
158 volatile unsigned long *vaddr)
160 char *p = (char *)vaddr + (nr ^ 31) / 8;
163 __asm__ __volatile__ ("bset %2,(%1); sne %0"
165 : "a" (p), "di" (nr & 7)
170 static inline int bset_mem_test_and_set_bit(int nr,
171 volatile unsigned long *vaddr)
173 char *p = (char *)vaddr + (nr ^ 31) / 8;
176 __asm__ __volatile__ ("bset %2,%1; sne %0"
177 : "=d" (retval), "+m" (*p)
182 static inline int bfset_mem_test_and_set_bit(int nr,
183 volatile unsigned long *vaddr)
187 __asm__ __volatile__ ("bfset %2{%1:#1}; sne %0"
189 : "d" (nr ^ 31), "o" (*vaddr)
194 #if defined(CONFIG_COLDFIRE)
195 #define test_and_set_bit(nr, vaddr) bset_reg_test_and_set_bit(nr, vaddr)
196 #elif defined(CONFIG_CPU_HAS_NO_BITFIELDS)
197 #define test_and_set_bit(nr, vaddr) bset_mem_test_and_set_bit(nr, vaddr)
199 #define test_and_set_bit(nr, vaddr) (__builtin_constant_p(nr) ? \
200 bset_mem_test_and_set_bit(nr, vaddr) : \
201 bfset_mem_test_and_set_bit(nr, vaddr))
204 #define __test_and_set_bit(nr, vaddr) test_and_set_bit(nr, vaddr)
207 static inline int bclr_reg_test_and_clear_bit(int nr,
208 volatile unsigned long *vaddr)
210 char *p = (char *)vaddr + (nr ^ 31) / 8;
213 __asm__ __volatile__ ("bclr %2,(%1); sne %0"
215 : "a" (p), "di" (nr & 7)
220 static inline int bclr_mem_test_and_clear_bit(int nr,
221 volatile unsigned long *vaddr)
223 char *p = (char *)vaddr + (nr ^ 31) / 8;
226 __asm__ __volatile__ ("bclr %2,%1; sne %0"
227 : "=d" (retval), "+m" (*p)
232 static inline int bfclr_mem_test_and_clear_bit(int nr,
233 volatile unsigned long *vaddr)
237 __asm__ __volatile__ ("bfclr %2{%1:#1}; sne %0"
239 : "d" (nr ^ 31), "o" (*vaddr)
244 #if defined(CONFIG_COLDFIRE)
245 #define test_and_clear_bit(nr, vaddr) bclr_reg_test_and_clear_bit(nr, vaddr)
246 #elif defined(CONFIG_CPU_HAS_NO_BITFIELDS)
247 #define test_and_clear_bit(nr, vaddr) bclr_mem_test_and_clear_bit(nr, vaddr)
249 #define test_and_clear_bit(nr, vaddr) (__builtin_constant_p(nr) ? \
250 bclr_mem_test_and_clear_bit(nr, vaddr) : \
251 bfclr_mem_test_and_clear_bit(nr, vaddr))
254 #define __test_and_clear_bit(nr, vaddr) test_and_clear_bit(nr, vaddr)
257 static inline int bchg_reg_test_and_change_bit(int nr,
258 volatile unsigned long *vaddr)
260 char *p = (char *)vaddr + (nr ^ 31) / 8;
263 __asm__ __volatile__ ("bchg %2,(%1); sne %0"
265 : "a" (p), "di" (nr & 7)
270 static inline int bchg_mem_test_and_change_bit(int nr,
271 volatile unsigned long *vaddr)
273 char *p = (char *)vaddr + (nr ^ 31) / 8;
276 __asm__ __volatile__ ("bchg %2,%1; sne %0"
277 : "=d" (retval), "+m" (*p)
282 static inline int bfchg_mem_test_and_change_bit(int nr,
283 volatile unsigned long *vaddr)
287 __asm__ __volatile__ ("bfchg %2{%1:#1}; sne %0"
289 : "d" (nr ^ 31), "o" (*vaddr)
294 #if defined(CONFIG_COLDFIRE)
295 #define test_and_change_bit(nr, vaddr) bchg_reg_test_and_change_bit(nr, vaddr)
296 #elif defined(CONFIG_CPU_HAS_NO_BITFIELDS)
297 #define test_and_change_bit(nr, vaddr) bchg_mem_test_and_change_bit(nr, vaddr)
299 #define test_and_change_bit(nr, vaddr) (__builtin_constant_p(nr) ? \
300 bchg_mem_test_and_change_bit(nr, vaddr) : \
301 bfchg_mem_test_and_change_bit(nr, vaddr))
304 #define __test_and_change_bit(nr, vaddr) test_and_change_bit(nr, vaddr)
308 * The true 68020 and more advanced processors support the "bfffo"
309 * instruction for finding bits. ColdFire and simple 68000 parts
310 * (including CPU32) do not support this. They simply use the generic
313 #if defined(CONFIG_CPU_HAS_NO_BITFIELDS)
314 #include <asm-generic/bitops/find.h>
315 #include <asm-generic/bitops/ffz.h>
318 static inline int find_first_zero_bit(const unsigned long *vaddr,
321 const unsigned long *p = vaddr;
329 words = (size + 31) >> 5;
330 while (!(num = ~*p++)) {
335 __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
336 : "=d" (res) : "d" (num & -num));
339 res += ((long)p - (long)vaddr - 4) * 8;
340 return res < size ? res : size;
342 #define find_first_zero_bit find_first_zero_bit
344 static inline int find_next_zero_bit(const unsigned long *vaddr, int size,
347 const unsigned long *p = vaddr + (offset >> 5);
348 int bit = offset & 31UL, res;
354 unsigned long num = ~*p++ & (~0UL << bit);
357 /* Look for zero in first longword */
358 __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
359 : "=d" (res) : "d" (num & -num));
362 return offset < size ? offset : size;
369 /* No zero yet, search remaining full bytes for a zero */
370 return offset + find_first_zero_bit(p, size - offset);
372 #define find_next_zero_bit find_next_zero_bit
374 static inline int find_first_bit(const unsigned long *vaddr, unsigned size)
376 const unsigned long *p = vaddr;
384 words = (size + 31) >> 5;
385 while (!(num = *p++)) {
390 __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
391 : "=d" (res) : "d" (num & -num));
394 res += ((long)p - (long)vaddr - 4) * 8;
395 return res < size ? res : size;
397 #define find_first_bit find_first_bit
399 static inline int find_next_bit(const unsigned long *vaddr, int size,
402 const unsigned long *p = vaddr + (offset >> 5);
403 int bit = offset & 31UL, res;
409 unsigned long num = *p++ & (~0UL << bit);
412 /* Look for one in first longword */
413 __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
414 : "=d" (res) : "d" (num & -num));
417 return offset < size ? offset : size;
424 /* No one yet, search remaining full bytes for a one */
425 return offset + find_first_bit(p, size - offset);
427 #define find_next_bit find_next_bit
430 * ffz = Find First Zero in word. Undefined if no zero exists,
431 * so code should check against ~0UL first..
433 static inline unsigned long ffz(unsigned long word)
437 __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
438 : "=d" (res) : "d" (~word & -~word));
446 #if defined(CONFIG_CPU_HAS_NO_BITFIELDS)
449 * The newer ColdFire family members support a "bitrev" instruction
450 * and we can use that to implement a fast ffs. Older Coldfire parts,
451 * and normal 68000 parts don't have anything special, so we use the
452 * generic functions for those.
454 #if (defined(__mcfisaaplus__) || defined(__mcfisac__)) && \
455 !defined(CONFIG_M68000) && !defined(CONFIG_MCPU32)
456 static inline int __ffs(int x)
458 __asm__ __volatile__ ("bitrev %0; ff1 %0"
464 static inline int ffs(int x)
472 #include <asm-generic/bitops/ffs.h>
473 #include <asm-generic/bitops/__ffs.h>
476 #include <asm-generic/bitops/fls.h>
477 #include <asm-generic/bitops/__fls.h>
482 * ffs: find first bit set. This is defined the same way as
483 * the libc and compiler builtin ffs routines, therefore
484 * differs in spirit from the above ffz (man ffs).
486 static inline int ffs(int x)
490 __asm__ ("bfffo %1{#0:#0},%0"
495 #define __ffs(x) (ffs(x) - 1)
498 * fls: find last bit set.
500 static inline int fls(int x)
504 __asm__ ("bfffo %1{#0,#0},%0"
510 static inline int __fls(int x)
517 #include <asm-generic/bitops/ext2-atomic.h>
518 #include <asm-generic/bitops/le.h>
519 #include <asm-generic/bitops/fls64.h>
520 #include <asm-generic/bitops/sched.h>
521 #include <asm-generic/bitops/hweight.h>
522 #include <asm-generic/bitops/lock.h>
523 #endif /* __KERNEL__ */
525 #endif /* _M68K_BITOPS_H */