1 /* $Id: bitops.h,v 1.39 2002/01/30 01:40:00 davem Exp $
2 * bitops.h: Bit string operations on the V9.
4 * Copyright 1996, 1997 David S. Miller (davem@caip.rutgers.edu)
7 #ifndef _SPARC64_BITOPS_H
8 #define _SPARC64_BITOPS_H
10 #include <linux/config.h>
11 #include <linux/compiler.h>
12 #include <asm/byteorder.h>
14 extern int test_and_set_bit(unsigned long nr, volatile unsigned long *addr);
15 extern int test_and_clear_bit(unsigned long nr, volatile unsigned long *addr);
16 extern int test_and_change_bit(unsigned long nr, volatile unsigned long *addr);
17 extern void set_bit(unsigned long nr, volatile unsigned long *addr);
18 extern void clear_bit(unsigned long nr, volatile unsigned long *addr);
19 extern void change_bit(unsigned long nr, volatile unsigned long *addr);
21 /* "non-atomic" versions... */
23 static inline void __set_bit(int nr, volatile unsigned long *addr)
25 unsigned long *m = ((unsigned long *)addr) + (nr >> 6);
27 *m |= (1UL << (nr & 63));
30 static inline void __clear_bit(int nr, volatile unsigned long *addr)
32 unsigned long *m = ((unsigned long *)addr) + (nr >> 6);
34 *m &= ~(1UL << (nr & 63));
37 static inline void __change_bit(int nr, volatile unsigned long *addr)
39 unsigned long *m = ((unsigned long *)addr) + (nr >> 6);
41 *m ^= (1UL << (nr & 63));
44 static inline int __test_and_set_bit(int nr, volatile unsigned long *addr)
46 unsigned long *m = ((unsigned long *)addr) + (nr >> 6);
47 unsigned long old = *m;
48 unsigned long mask = (1UL << (nr & 63));
51 return ((old & mask) != 0);
54 static inline int __test_and_clear_bit(int nr, volatile unsigned long *addr)
56 unsigned long *m = ((unsigned long *)addr) + (nr >> 6);
57 unsigned long old = *m;
58 unsigned long mask = (1UL << (nr & 63));
61 return ((old & mask) != 0);
64 static inline int __test_and_change_bit(int nr, volatile unsigned long *addr)
66 unsigned long *m = ((unsigned long *)addr) + (nr >> 6);
67 unsigned long old = *m;
68 unsigned long mask = (1UL << (nr & 63));
71 return ((old & mask) != 0);
75 #define smp_mb__before_clear_bit() membar_storeload_loadload()
76 #define smp_mb__after_clear_bit() membar_storeload_storestore()
78 #define smp_mb__before_clear_bit() barrier()
79 #define smp_mb__after_clear_bit() barrier()
82 static inline int test_bit(int nr, __const__ volatile unsigned long *addr)
84 return (1UL & (addr[nr >> 6] >> (nr & 63))) != 0UL;
87 /* The easy/cheese version for now. */
88 static inline unsigned long ffz(unsigned long word)
101 * __ffs - find first bit in word.
102 * @word: The word to search
104 * Undefined if no bit exists, so code should check against 0 first.
106 static inline unsigned long __ffs(unsigned long word)
108 unsigned long result = 0;
110 while (!(word & 1UL)) {
118 * fls: find last bit set.
121 #define fls(x) generic_fls(x)
126 * Every architecture must define this function. It's the fastest
127 * way of searching a 140-bit bitmap where the first 100 bits are
128 * unlikely to be set. It's guaranteed that at least one of the 140
131 static inline int sched_find_first_bit(unsigned long *b)
135 if (unlikely(((unsigned int)b[1])))
136 return __ffs(b[1]) + 64;
138 return __ffs(b[1] >> 32) + 96;
139 return __ffs(b[2]) + 128;
143 * ffs: find first bit set. This is defined the same way as
144 * the libc and compiler builtin ffs routines, therefore
145 * differs in spirit from the above ffz (man ffs).
147 static inline int ffs(int x)
151 return __ffs((unsigned long)x) + 1;
155 * hweightN: returns the hamming weight (i.e. the number
156 * of bits set) of a N-bit word
159 #ifdef ULTRA_HAS_POPULATION_COUNT
161 static inline unsigned int hweight64(unsigned long w)
165 __asm__ ("popc %1,%0" : "=r" (res) : "r" (w));
169 static inline unsigned int hweight32(unsigned int w)
173 __asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xffffffff));
177 static inline unsigned int hweight16(unsigned int w)
181 __asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xffff));
185 static inline unsigned int hweight8(unsigned int w)
189 __asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xff));
195 #define hweight64(x) generic_hweight64(x)
196 #define hweight32(x) generic_hweight32(x)
197 #define hweight16(x) generic_hweight16(x)
198 #define hweight8(x) generic_hweight8(x)
201 #endif /* __KERNEL__ */
204 * find_next_bit - find the next set bit in a memory region
205 * @addr: The address to base the search on
206 * @offset: The bitnumber to start searching at
207 * @size: The maximum size to search
209 extern unsigned long find_next_bit(const unsigned long *, unsigned long,
213 * find_first_bit - find the first set bit in a memory region
214 * @addr: The address to start the search at
215 * @size: The maximum size to search
217 * Returns the bit-number of the first set bit, not the number of the byte
220 #define find_first_bit(addr, size) \
221 find_next_bit((addr), (size), 0)
223 /* find_next_zero_bit() finds the first zero bit in a bit string of length
224 * 'size' bits, starting the search at bit 'offset'. This is largely based
225 * on Linus's ALPHA routines, which are pretty portable BTW.
228 extern unsigned long find_next_zero_bit(const unsigned long *,
229 unsigned long, unsigned long);
231 #define find_first_zero_bit(addr, size) \
232 find_next_zero_bit((addr), (size), 0)
234 #define test_and_set_le_bit(nr,addr) \
235 test_and_set_bit((nr) ^ 0x38, (addr))
236 #define test_and_clear_le_bit(nr,addr) \
237 test_and_clear_bit((nr) ^ 0x38, (addr))
239 static inline int test_le_bit(int nr, __const__ unsigned long * addr)
242 __const__ unsigned char *ADDR = (__const__ unsigned char *) addr;
245 mask = 1 << (nr & 0x07);
246 return ((mask & *ADDR) != 0);
249 #define find_first_zero_le_bit(addr, size) \
250 find_next_zero_le_bit((addr), (size), 0)
252 extern unsigned long find_next_zero_le_bit(unsigned long *, unsigned long, unsigned long);
256 #define __set_le_bit(nr, addr) \
257 __set_bit((nr) ^ 0x38, (addr))
258 #define __clear_le_bit(nr, addr) \
259 __clear_bit((nr) ^ 0x38, (addr))
260 #define __test_and_clear_le_bit(nr, addr) \
261 __test_and_clear_bit((nr) ^ 0x38, (addr))
262 #define __test_and_set_le_bit(nr, addr) \
263 __test_and_set_bit((nr) ^ 0x38, (addr))
265 #define ext2_set_bit(nr,addr) \
266 __test_and_set_le_bit((nr),(unsigned long *)(addr))
267 #define ext2_set_bit_atomic(lock,nr,addr) \
268 test_and_set_le_bit((nr),(unsigned long *)(addr))
269 #define ext2_clear_bit(nr,addr) \
270 __test_and_clear_le_bit((nr),(unsigned long *)(addr))
271 #define ext2_clear_bit_atomic(lock,nr,addr) \
272 test_and_clear_le_bit((nr),(unsigned long *)(addr))
273 #define ext2_test_bit(nr,addr) \
274 test_le_bit((nr),(unsigned long *)(addr))
275 #define ext2_find_first_zero_bit(addr, size) \
276 find_first_zero_le_bit((unsigned long *)(addr), (size))
277 #define ext2_find_next_zero_bit(addr, size, off) \
278 find_next_zero_le_bit((unsigned long *)(addr), (size), (off))
280 /* Bitmap functions for the minix filesystem. */
281 #define minix_test_and_set_bit(nr,addr) \
282 test_and_set_bit((nr),(unsigned long *)(addr))
283 #define minix_set_bit(nr,addr) \
284 set_bit((nr),(unsigned long *)(addr))
285 #define minix_test_and_clear_bit(nr,addr) \
286 test_and_clear_bit((nr),(unsigned long *)(addr))
287 #define minix_test_bit(nr,addr) \
288 test_bit((nr),(unsigned long *)(addr))
289 #define minix_find_first_zero_bit(addr,size) \
290 find_first_zero_bit((unsigned long *)(addr),(size))
292 #endif /* __KERNEL__ */
294 #endif /* defined(_SPARC64_BITOPS_H) */