1 #ifndef _MICROBLAZE_BITOPS_H
2 #define _MICROBLAZE_BITOPS_H
5 * Copyright 1992, Linus Torvalds.
8 #include <asm/byteorder.h> /* swab32 */
9 #include <asm/system.h> /* save_flags */
13 * Function prototypes to keep gcc -Wall happy
17 * The __ functions are not atomic
20 extern void set_bit(int nr, volatile void * addr);
21 extern void __set_bit(int nr, volatile void * addr);
23 extern void clear_bit(int nr, volatile void * addr);
24 #define __clear_bit(nr, addr) clear_bit(nr, addr)
25 #define PLATFORM__CLEAR_BIT
27 extern void change_bit(int nr, volatile void * addr);
28 extern void __change_bit(int nr, volatile void * addr);
29 extern int test_and_set_bit(int nr, volatile void * addr);
30 extern int __test_and_set_bit(int nr, volatile void * addr);
31 extern int test_and_clear_bit(int nr, volatile void * addr);
32 extern int __test_and_clear_bit(int nr, volatile void * addr);
33 extern int test_and_change_bit(int nr, volatile void * addr);
34 extern int __test_and_change_bit(int nr, volatile void * addr);
35 extern int __constant_test_bit(int nr, const volatile void * addr);
36 extern int __test_bit(int nr, volatile void * addr);
37 extern int find_first_zero_bit(void * addr, unsigned size);
38 extern int find_next_zero_bit (void * addr, int size, int offset);
41 * ffz = Find First Zero in word. Undefined if no zero exists,
42 * so code should check against ~0UL first..
44 extern __inline__ unsigned long ffz(unsigned long word)
46 unsigned long result = 0;
56 extern __inline__ void set_bit(int nr, volatile void * addr)
58 int * a = (int *) addr;
63 mask = 1 << (nr & 0x1f);
64 save_flags_cli(flags);
69 extern __inline__ void __set_bit(int nr, volatile void * addr)
71 int * a = (int *) addr;
75 mask = 1 << (nr & 0x1f);
78 #define PLATFORM__SET_BIT
81 * clear_bit() doesn't provide any barrier for the compiler.
83 #define smp_mb__before_clear_bit() barrier()
84 #define smp_mb__after_clear_bit() barrier()
86 extern __inline__ void clear_bit(int nr, volatile void * addr)
88 int * a = (int *) addr;
93 mask = 1 << (nr & 0x1f);
94 save_flags_cli(flags);
99 extern __inline__ void change_bit(int nr, volatile void * addr)
103 unsigned long *ADDR = (unsigned long *) addr;
106 mask = 1 << (nr & 31);
107 save_flags_cli(flags);
109 restore_flags(flags);
112 extern __inline__ void __change_bit(int nr, volatile void * addr)
115 unsigned long *ADDR = (unsigned long *) addr;
118 mask = 1 << (nr & 31);
122 extern __inline__ int test_and_set_bit(int nr, volatile void * addr)
125 volatile unsigned int *a = (volatile unsigned int *) addr;
129 mask = 1 << (nr & 0x1f);
130 save_flags_cli(flags);
131 retval = (mask & *a) != 0;
133 restore_flags(flags);
138 extern __inline__ int __test_and_set_bit(int nr, volatile void * addr)
141 volatile unsigned int *a = (volatile unsigned int *) addr;
144 mask = 1 << (nr & 0x1f);
145 retval = (mask & *a) != 0;
150 extern __inline__ int test_and_clear_bit(int nr, volatile void * addr)
153 volatile unsigned int *a = (volatile unsigned int *) addr;
157 mask = 1 << (nr & 0x1f);
158 save_flags_cli(flags);
159 retval = (mask & *a) != 0;
161 restore_flags(flags);
166 extern __inline__ int __test_and_clear_bit(int nr, volatile void * addr)
169 volatile unsigned int *a = (volatile unsigned int *) addr;
172 mask = 1 << (nr & 0x1f);
173 retval = (mask & *a) != 0;
178 extern __inline__ int test_and_change_bit(int nr, volatile void * addr)
181 volatile unsigned int *a = (volatile unsigned int *) addr;
185 mask = 1 << (nr & 0x1f);
186 save_flags_cli(flags);
187 retval = (mask & *a) != 0;
189 restore_flags(flags);
194 extern __inline__ int __test_and_change_bit(int nr, volatile void * addr)
197 volatile unsigned int *a = (volatile unsigned int *) addr;
200 mask = 1 << (nr & 0x1f);
201 retval = (mask & *a) != 0;
207 * This routine doesn't need to be atomic.
209 extern __inline__ int __constant_test_bit(int nr, const volatile void * addr)
211 return ((1UL << (nr & 31)) & (((const volatile unsigned int *) addr)[nr >> 5])) != 0;
214 extern __inline__ int __test_bit(int nr, volatile void * addr)
216 int * a = (int *) addr;
220 mask = 1 << (nr & 0x1f);
221 return ((mask & *a) != 0);
224 #define test_bit(nr,addr) \
225 (__builtin_constant_p(nr) ? \
226 __constant_test_bit((nr),(addr)) : \
227 __test_bit((nr),(addr)))
229 #define find_first_zero_bit(addr, size) \
230 find_next_zero_bit((addr), (size), 0)
232 extern __inline__ int find_next_zero_bit (void * addr, int size, int offset)
234 unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
235 unsigned long result = offset & ~31UL;
244 tmp |= ~0UL >> (32-offset);
252 while (size & ~31UL) {
265 return result + ffz(tmp);
269 * hweightN: returns the hamming weight (i.e. the number
270 * of bits set) of a N-bit word
273 #define hweight32(x) generic_hweight32(x)
274 #define hweight16(x) generic_hweight16(x)
275 #define hweight8(x) generic_hweight8(x)
278 extern __inline__ int ext2_set_bit(int nr, volatile void * addr)
282 volatile unsigned char *ADDR = (unsigned char *) addr;
285 mask = 1 << (nr & 0x07);
286 save_flags_cli(flags);
287 retval = (mask & *ADDR) != 0;
289 restore_flags(flags);
293 extern __inline__ int ext2_clear_bit(int nr, volatile void * addr)
297 volatile unsigned char *ADDR = (unsigned char *) addr;
300 mask = 1 << (nr & 0x07);
301 save_flags_cli(flags);
302 retval = (mask & *ADDR) != 0;
304 restore_flags(flags);
308 extern __inline__ int ext2_test_bit(int nr, const volatile void * addr)
311 const volatile unsigned char *ADDR = (const unsigned char *) addr;
314 mask = 1 << (nr & 0x07);
315 return ((mask & *ADDR) != 0);
318 #define ext2_find_first_zero_bit(addr, size) \
319 ext2_find_next_zero_bit((addr), (size), 0)
321 static inline unsigned long ext2_find_next_zero_bit(void *addr,
322 unsigned long size, unsigned long offset)
324 unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
325 unsigned long result = offset & ~31UL;
333 /* We hold the little endian value in tmp, but then the
334 * shift is illegal. So we could keep a big endian value
337 * tmp = __swab32(*(p++));
338 * tmp |= ~0UL >> (32-offset);
340 * but this would decrease preformance, so we change the
344 tmp |= __swab32(~0UL >> (32-offset));
352 while(size & ~31UL) {
363 /* tmp is little endian, so we would have to swab the shift,
364 * see above. But then we have to swab tmp below for ffz, so
365 * we might as well do this here.
367 return result + ffz(__swab32(tmp) | (~0UL << size));
369 return result + ffz(__swab32(tmp));
372 /* Bitmap functions for the minix filesystem. */
373 #define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
374 #define minix_set_bit(nr,addr) set_bit(nr,addr)
375 #define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
376 #define minix_test_bit(nr,addr) test_bit(nr,addr)
377 #define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
380 * hweightN - returns the hamming weight of a N-bit word
381 * @x: the word to weigh
383 * The Hamming Weight of a number is the total number of bits set in it.
386 #define hweight32(x) generic_hweight32(x)
387 #define hweight16(x) generic_hweight16(x)
388 #define hweight8(x) generic_hweight8(x)
390 #endif /* __KERNEL__ */
392 #endif /* _MICROBLAZE_BITOPS_H */