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)
122 #define fls64(x) generic_fls64(x)
127 * Every architecture must define this function. It's the fastest
128 * way of searching a 140-bit bitmap where the first 100 bits are
129 * unlikely to be set. It's guaranteed that at least one of the 140
132 static inline int sched_find_first_bit(unsigned long *b)
136 if (unlikely(((unsigned int)b[1])))
137 return __ffs(b[1]) + 64;
139 return __ffs(b[1] >> 32) + 96;
140 return __ffs(b[2]) + 128;
144 * ffs: find first bit set. This is defined the same way as
145 * the libc and compiler builtin ffs routines, therefore
146 * differs in spirit from the above ffz (man ffs).
148 static inline int ffs(int x)
152 return __ffs((unsigned long)x) + 1;
156 * hweightN: returns the hamming weight (i.e. the number
157 * of bits set) of a N-bit word
160 #ifdef ULTRA_HAS_POPULATION_COUNT
162 static inline unsigned int hweight64(unsigned long w)
166 __asm__ ("popc %1,%0" : "=r" (res) : "r" (w));
170 static inline unsigned int hweight32(unsigned int w)
174 __asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xffffffff));
178 static inline unsigned int hweight16(unsigned int w)
182 __asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xffff));
186 static inline unsigned int hweight8(unsigned int w)
190 __asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xff));
196 #define hweight64(x) generic_hweight64(x)
197 #define hweight32(x) generic_hweight32(x)
198 #define hweight16(x) generic_hweight16(x)
199 #define hweight8(x) generic_hweight8(x)
202 #endif /* __KERNEL__ */
205 * find_next_bit - find the next set bit in a memory region
206 * @addr: The address to base the search on
207 * @offset: The bitnumber to start searching at
208 * @size: The maximum size to search
210 extern unsigned long find_next_bit(const unsigned long *, unsigned long,
214 * find_first_bit - find the first set bit in a memory region
215 * @addr: The address to start the search at
216 * @size: The maximum size to search
218 * Returns the bit-number of the first set bit, not the number of the byte
221 #define find_first_bit(addr, size) \
222 find_next_bit((addr), (size), 0)
224 /* find_next_zero_bit() finds the first zero bit in a bit string of length
225 * 'size' bits, starting the search at bit 'offset'. This is largely based
226 * on Linus's ALPHA routines, which are pretty portable BTW.
229 extern unsigned long find_next_zero_bit(const unsigned long *,
230 unsigned long, unsigned long);
232 #define find_first_zero_bit(addr, size) \
233 find_next_zero_bit((addr), (size), 0)
235 #define test_and_set_le_bit(nr,addr) \
236 test_and_set_bit((nr) ^ 0x38, (addr))
237 #define test_and_clear_le_bit(nr,addr) \
238 test_and_clear_bit((nr) ^ 0x38, (addr))
240 static inline int test_le_bit(int nr, __const__ unsigned long * addr)
243 __const__ unsigned char *ADDR = (__const__ unsigned char *) addr;
246 mask = 1 << (nr & 0x07);
247 return ((mask & *ADDR) != 0);
250 #define find_first_zero_le_bit(addr, size) \
251 find_next_zero_le_bit((addr), (size), 0)
253 extern unsigned long find_next_zero_le_bit(unsigned long *, unsigned long, unsigned long);
257 #define __set_le_bit(nr, addr) \
258 __set_bit((nr) ^ 0x38, (addr))
259 #define __clear_le_bit(nr, addr) \
260 __clear_bit((nr) ^ 0x38, (addr))
261 #define __test_and_clear_le_bit(nr, addr) \
262 __test_and_clear_bit((nr) ^ 0x38, (addr))
263 #define __test_and_set_le_bit(nr, addr) \
264 __test_and_set_bit((nr) ^ 0x38, (addr))
266 #define ext2_set_bit(nr,addr) \
267 __test_and_set_le_bit((nr),(unsigned long *)(addr))
268 #define ext2_set_bit_atomic(lock,nr,addr) \
269 test_and_set_le_bit((nr),(unsigned long *)(addr))
270 #define ext2_clear_bit(nr,addr) \
271 __test_and_clear_le_bit((nr),(unsigned long *)(addr))
272 #define ext2_clear_bit_atomic(lock,nr,addr) \
273 test_and_clear_le_bit((nr),(unsigned long *)(addr))
274 #define ext2_test_bit(nr,addr) \
275 test_le_bit((nr),(unsigned long *)(addr))
276 #define ext2_find_first_zero_bit(addr, size) \
277 find_first_zero_le_bit((unsigned long *)(addr), (size))
278 #define ext2_find_next_zero_bit(addr, size, off) \
279 find_next_zero_le_bit((unsigned long *)(addr), (size), (off))
281 /* Bitmap functions for the minix filesystem. */
282 #define minix_test_and_set_bit(nr,addr) \
283 test_and_set_bit((nr),(unsigned long *)(addr))
284 #define minix_set_bit(nr,addr) \
285 set_bit((nr),(unsigned long *)(addr))
286 #define minix_test_and_clear_bit(nr,addr) \
287 test_and_clear_bit((nr),(unsigned long *)(addr))
288 #define minix_test_bit(nr,addr) \
289 test_bit((nr),(unsigned long *)(addr))
290 #define minix_find_first_zero_bit(addr,size) \
291 find_first_zero_bit((unsigned long *)(addr),(size))
293 #endif /* __KERNEL__ */
295 #endif /* defined(_SPARC64_BITOPS_H) */