2 * U-boot - bitops.h Routines for bit operations
4 * Copyright (c) 2005-2007 Analog Devices Inc.
6 * SPDX-License-Identifier: GPL-2.0+
9 #ifndef _BLACKFIN_BITOPS_H
10 #define _BLACKFIN_BITOPS_H
13 * Copyright 1992, Linus Torvalds.
16 #include <asm/byteorder.h>
17 #include <asm/system.h>
21 * Function prototypes to keep gcc -Wall happy
25 * The __ functions are not atomic
29 * ffz = Find First Zero in word. Undefined if no zero exists,
30 * so code should check against ~0UL first..
32 static __inline__ unsigned long ffz(unsigned long word)
34 unsigned long result = 0;
43 static __inline__ void set_bit(int nr, volatile void *addr)
50 mask = 1 << (nr & 0x1f);
51 local_irq_save(flags);
53 local_irq_restore(flags);
56 static __inline__ void __set_bit(int nr, volatile void *addr)
62 mask = 1 << (nr & 0x1f);
65 #define PLATFORM__SET_BIT
68 * clear_bit() doesn't provide any barrier for the compiler.
70 #define smp_mb__before_clear_bit() barrier()
71 #define smp_mb__after_clear_bit() barrier()
73 static __inline__ void clear_bit(int nr, volatile void *addr)
80 mask = 1 << (nr & 0x1f);
81 local_irq_save(flags);
83 local_irq_restore(flags);
86 static __inline__ void change_bit(int nr, volatile void *addr)
89 unsigned long *ADDR = (unsigned long *)addr;
92 mask = 1 << (nr & 31);
93 local_irq_save(flags);
95 local_irq_restore(flags);
98 static __inline__ void __change_bit(int nr, volatile void *addr)
101 unsigned long *ADDR = (unsigned long *)addr;
104 mask = 1 << (nr & 31);
108 static __inline__ int test_and_set_bit(int nr, volatile void *addr)
111 volatile unsigned int *a = (volatile unsigned int *)addr;
115 mask = 1 << (nr & 0x1f);
116 local_irq_save(flags);
117 retval = (mask & *a) != 0;
119 local_irq_restore(flags);
124 static __inline__ int __test_and_set_bit(int nr, volatile void *addr)
127 volatile unsigned int *a = (volatile unsigned int *)addr;
130 mask = 1 << (nr & 0x1f);
131 retval = (mask & *a) != 0;
136 static __inline__ int test_and_clear_bit(int nr, volatile void *addr)
139 volatile unsigned int *a = (volatile unsigned int *)addr;
143 mask = 1 << (nr & 0x1f);
144 local_irq_save(flags);
145 retval = (mask & *a) != 0;
147 local_irq_restore(flags);
152 static __inline__ int __test_and_clear_bit(int nr, volatile void *addr)
155 volatile unsigned int *a = (volatile unsigned int *)addr;
158 mask = 1 << (nr & 0x1f);
159 retval = (mask & *a) != 0;
164 static __inline__ int test_and_change_bit(int nr, volatile void *addr)
167 volatile unsigned int *a = (volatile unsigned int *)addr;
171 mask = 1 << (nr & 0x1f);
172 local_irq_save(flags);
173 retval = (mask & *a) != 0;
175 local_irq_restore(flags);
180 static __inline__ int __test_and_change_bit(int nr, volatile void *addr)
183 volatile unsigned int *a = (volatile unsigned int *)addr;
186 mask = 1 << (nr & 0x1f);
187 retval = (mask & *a) != 0;
193 * This routine doesn't need to be atomic.
195 static __inline__ int __constant_test_bit(int nr, const volatile void *addr)
197 return ((1UL << (nr & 31)) &
198 (((const volatile unsigned int *)addr)[nr >> 5])) != 0;
201 static __inline__ int __test_bit(int nr, volatile void *addr)
203 int *a = (int *)addr;
207 mask = 1 << (nr & 0x1f);
208 return ((mask & *a) != 0);
211 #define test_bit(nr,addr) \
212 (__builtin_constant_p(nr) ? \
213 __constant_test_bit((nr),(addr)) : \
214 __test_bit((nr),(addr)))
216 #define find_first_zero_bit(addr, size) \
217 find_next_zero_bit((addr), (size), 0)
219 static __inline__ int find_next_zero_bit(void *addr, int size, int offset)
221 unsigned long *p = ((unsigned long *)addr) + (offset >> 5);
222 unsigned long result = offset & ~31UL;
231 tmp |= ~0UL >> (32 - offset);
239 while (size & ~31UL) {
252 return result + ffz(tmp);
256 * hweightN: returns the hamming weight (i.e. the number
257 * of bits set) of a N-bit word
260 #define hweight32(x) generic_hweight32(x)
261 #define hweight16(x) generic_hweight16(x)
262 #define hweight8(x) generic_hweight8(x)
264 static __inline__ int ext2_set_bit(int nr, volatile void *addr)
268 volatile unsigned char *ADDR = (unsigned char *)addr;
271 mask = 1 << (nr & 0x07);
272 local_irq_save(flags);
273 retval = (mask & *ADDR) != 0;
275 local_irq_restore(flags);
279 static __inline__ int ext2_clear_bit(int nr, volatile void *addr)
283 volatile unsigned char *ADDR = (unsigned char *)addr;
286 mask = 1 << (nr & 0x07);
287 local_irq_save(flags);
288 retval = (mask & *ADDR) != 0;
290 local_irq_restore(flags);
294 static __inline__ int ext2_test_bit(int nr, const volatile void *addr)
297 const volatile unsigned char *ADDR = (const unsigned char *)addr;
300 mask = 1 << (nr & 0x07);
301 return ((mask & *ADDR) != 0);
304 #define ext2_find_first_zero_bit(addr, size) \
305 ext2_find_next_zero_bit((addr), (size), 0)
307 static __inline__ unsigned long ext2_find_next_zero_bit(void *addr,
309 unsigned long offset)
311 unsigned long *p = ((unsigned long *)addr) + (offset >> 5);
312 unsigned long result = offset & ~31UL;
321 tmp |= ~0UL >> (32 - offset);
329 while (size & ~31UL) {
342 return result + ffz(tmp);
345 /* Bitmap functions for the minix filesystem. */
346 #define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
347 #define minix_set_bit(nr,addr) set_bit(nr,addr)
348 #define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
349 #define minix_test_bit(nr,addr) test_bit(nr,addr)
350 #define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)