aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-m68knommu/bitops.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-m68knommu/bitops.h')
-rw-r--r--include/asm-m68knommu/bitops.h221
1 files changed, 9 insertions, 212 deletions
diff --git a/include/asm-m68knommu/bitops.h b/include/asm-m68knommu/bitops.h
index 00c4a2548e60..0b68ccd327f7 100644
--- a/include/asm-m68knommu/bitops.h
+++ b/include/asm-m68knommu/bitops.h
@@ -12,104 +12,10 @@
12 12
13#ifdef __KERNEL__ 13#ifdef __KERNEL__
14 14
15/* 15#include <asm-generic/bitops/ffs.h>
16 * Generic ffs(). 16#include <asm-generic/bitops/__ffs.h>
17 */ 17#include <asm-generic/bitops/sched.h>
18static inline int ffs(int x) 18#include <asm-generic/bitops/ffz.h>
19{
20 int r = 1;
21
22 if (!x)
23 return 0;
24 if (!(x & 0xffff)) {
25 x >>= 16;
26 r += 16;
27 }
28 if (!(x & 0xff)) {
29 x >>= 8;
30 r += 8;
31 }
32 if (!(x & 0xf)) {
33 x >>= 4;
34 r += 4;
35 }
36 if (!(x & 3)) {
37 x >>= 2;
38 r += 2;
39 }
40 if (!(x & 1)) {
41 x >>= 1;
42 r += 1;
43 }
44 return r;
45}
46
47/*
48 * Generic __ffs().
49 */
50static inline int __ffs(int x)
51{
52 int r = 0;
53
54 if (!x)
55 return 0;
56 if (!(x & 0xffff)) {
57 x >>= 16;
58 r += 16;
59 }
60 if (!(x & 0xff)) {
61 x >>= 8;
62 r += 8;
63 }
64 if (!(x & 0xf)) {
65 x >>= 4;
66 r += 4;
67 }
68 if (!(x & 3)) {
69 x >>= 2;
70 r += 2;
71 }
72 if (!(x & 1)) {
73 x >>= 1;
74 r += 1;
75 }
76 return r;
77}
78
79/*
80 * Every architecture must define this function. It's the fastest
81 * way of searching a 140-bit bitmap where the first 100 bits are
82 * unlikely to be set. It's guaranteed that at least one of the 140
83 * bits is cleared.
84 */
85static inline int sched_find_first_bit(unsigned long *b)
86{
87 if (unlikely(b[0]))
88 return __ffs(b[0]);
89 if (unlikely(b[1]))
90 return __ffs(b[1]) + 32;
91 if (unlikely(b[2]))
92 return __ffs(b[2]) + 64;
93 if (b[3])
94 return __ffs(b[3]) + 96;
95 return __ffs(b[4]) + 128;
96}
97
98/*
99 * ffz = Find First Zero in word. Undefined if no zero exists,
100 * so code should check against ~0UL first..
101 */
102static __inline__ unsigned long ffz(unsigned long word)
103{
104 unsigned long result = 0;
105
106 while(word & 1) {
107 result++;
108 word >>= 1;
109 }
110 return result;
111}
112
113 19
114static __inline__ void set_bit(int nr, volatile unsigned long * addr) 20static __inline__ void set_bit(int nr, volatile unsigned long * addr)
115{ 21{
@@ -254,98 +160,8 @@ static __inline__ int __test_bit(int nr, const volatile unsigned long * addr)
254 __constant_test_bit((nr),(addr)) : \ 160 __constant_test_bit((nr),(addr)) : \
255 __test_bit((nr),(addr))) 161 __test_bit((nr),(addr)))
256 162
257#define find_first_zero_bit(addr, size) \ 163#include <asm-generic/bitops/find.h>
258 find_next_zero_bit((addr), (size), 0) 164#include <asm-generic/bitops/hweight.h>
259#define find_first_bit(addr, size) \
260 find_next_bit((addr), (size), 0)
261
262static __inline__ int find_next_zero_bit (const void * addr, int size, int offset)
263{
264 unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
265 unsigned long result = offset & ~31UL;
266 unsigned long tmp;
267
268 if (offset >= size)
269 return size;
270 size -= result;
271 offset &= 31UL;
272 if (offset) {
273 tmp = *(p++);
274 tmp |= ~0UL >> (32-offset);
275 if (size < 32)
276 goto found_first;
277 if (~tmp)
278 goto found_middle;
279 size -= 32;
280 result += 32;
281 }
282 while (size & ~31UL) {
283 if (~(tmp = *(p++)))
284 goto found_middle;
285 result += 32;
286 size -= 32;
287 }
288 if (!size)
289 return result;
290 tmp = *p;
291
292found_first:
293 tmp |= ~0UL << size;
294found_middle:
295 return result + ffz(tmp);
296}
297
298/*
299 * Find next one bit in a bitmap reasonably efficiently.
300 */
301static __inline__ unsigned long find_next_bit(const unsigned long *addr,
302 unsigned long size, unsigned long offset)
303{
304 unsigned int *p = ((unsigned int *) addr) + (offset >> 5);
305 unsigned int result = offset & ~31UL;
306 unsigned int tmp;
307
308 if (offset >= size)
309 return size;
310 size -= result;
311 offset &= 31UL;
312 if (offset) {
313 tmp = *p++;
314 tmp &= ~0UL << offset;
315 if (size < 32)
316 goto found_first;
317 if (tmp)
318 goto found_middle;
319 size -= 32;
320 result += 32;
321 }
322 while (size >= 32) {
323 if ((tmp = *p++) != 0)
324 goto found_middle;
325 result += 32;
326 size -= 32;
327 }
328 if (!size)
329 return result;
330 tmp = *p;
331
332found_first:
333 tmp &= ~0UL >> (32 - size);
334 if (tmp == 0UL) /* Are any bits set? */
335 return result + size; /* Nope. */
336found_middle:
337 return result + __ffs(tmp);
338}
339
340/*
341 * hweightN: returns the hamming weight (i.e. the number
342 * of bits set) of a N-bit word
343 */
344
345#define hweight32(x) generic_hweight32(x)
346#define hweight16(x) generic_hweight16(x)
347#define hweight8(x) generic_hweight8(x)
348
349 165
350static __inline__ int ext2_set_bit(int nr, volatile void * addr) 166static __inline__ int ext2_set_bit(int nr, volatile void * addr)
351{ 167{
@@ -475,30 +291,11 @@ found_middle:
475 return result + ffz(__swab32(tmp)); 291 return result + ffz(__swab32(tmp));
476} 292}
477 293
478/* Bitmap functions for the minix filesystem. */ 294#include <asm-generic/bitops/minix.h>
479#define minix_test_and_set_bit(nr,addr) __test_and_set_bit(nr,addr)
480#define minix_set_bit(nr,addr) __set_bit(nr,addr)
481#define minix_test_and_clear_bit(nr,addr) __test_and_clear_bit(nr,addr)
482#define minix_test_bit(nr,addr) test_bit(nr,addr)
483#define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
484
485/**
486 * hweightN - returns the hamming weight of a N-bit word
487 * @x: the word to weigh
488 *
489 * The Hamming Weight of a number is the total number of bits set in it.
490 */
491
492#define hweight32(x) generic_hweight32(x)
493#define hweight16(x) generic_hweight16(x)
494#define hweight8(x) generic_hweight8(x)
495 295
496#endif /* __KERNEL__ */ 296#endif /* __KERNEL__ */
497 297
498/* 298#include <asm-generic/bitops/fls.h>
499 * fls: find last bit set. 299#include <asm-generic/bitops/fls64.h>
500 */
501#define fls(x) generic_fls(x)
502#define fls64(x) generic_fls64(x)
503 300
504#endif /* _M68KNOMMU_BITOPS_H */ 301#endif /* _M68KNOMMU_BITOPS_H */