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 <linux/config.h>
17 #include <asm/byteorder.h>
18 #include <asm/system.h>
22 * Function prototypes to keep gcc -Wall happy
26 * The __ functions are not atomic
30 * ffz = Find First Zero in word. Undefined if no zero exists,
31 * so code should check against ~0UL first..
33 static __inline__ unsigned long ffz(unsigned long word)
35 unsigned long result = 0;
44 static __inline__ void set_bit(int nr, volatile void *addr)
51 mask = 1 << (nr & 0x1f);
52 local_irq_save(flags);
54 local_irq_restore(flags);
57 static __inline__ void __set_bit(int nr, volatile void *addr)
63 mask = 1 << (nr & 0x1f);
66 #define PLATFORM__SET_BIT
69 * clear_bit() doesn't provide any barrier for the compiler.
71 #define smp_mb__before_clear_bit() barrier()
72 #define smp_mb__after_clear_bit() barrier()
74 static __inline__ void clear_bit(int nr, volatile void *addr)
81 mask = 1 << (nr & 0x1f);
82 local_irq_save(flags);
84 local_irq_restore(flags);
87 static __inline__ void change_bit(int nr, volatile void *addr)
90 unsigned long *ADDR = (unsigned long *)addr;
93 mask = 1 << (nr & 31);
94 local_irq_save(flags);
96 local_irq_restore(flags);
99 static __inline__ void __change_bit(int nr, volatile void *addr)
102 unsigned long *ADDR = (unsigned long *)addr;
105 mask = 1 << (nr & 31);
109 static __inline__ int test_and_set_bit(int nr, volatile void *addr)
112 volatile unsigned int *a = (volatile unsigned int *)addr;
116 mask = 1 << (nr & 0x1f);
117 local_irq_save(flags);
118 retval = (mask & *a) != 0;
120 local_irq_restore(flags);
125 static __inline__ int __test_and_set_bit(int nr, volatile void *addr)
128 volatile unsigned int *a = (volatile unsigned int *)addr;
131 mask = 1 << (nr & 0x1f);
132 retval = (mask & *a) != 0;
137 static __inline__ int test_and_clear_bit(int nr, volatile void *addr)
140 volatile unsigned int *a = (volatile unsigned int *)addr;
144 mask = 1 << (nr & 0x1f);
145 local_irq_save(flags);
146 retval = (mask & *a) != 0;
148 local_irq_restore(flags);
153 static __inline__ int __test_and_clear_bit(int nr, volatile void *addr)
156 volatile unsigned int *a = (volatile unsigned int *)addr;
159 mask = 1 << (nr & 0x1f);
160 retval = (mask & *a) != 0;
165 static __inline__ int test_and_change_bit(int nr, volatile void *addr)
168 volatile unsigned int *a = (volatile unsigned int *)addr;
172 mask = 1 << (nr & 0x1f);
173 local_irq_save(flags);
174 retval = (mask & *a) != 0;
176 local_irq_restore(flags);
181 static __inline__ int __test_and_change_bit(int nr, volatile void *addr)
184 volatile unsigned int *a = (volatile unsigned int *)addr;
187 mask = 1 << (nr & 0x1f);
188 retval = (mask & *a) != 0;
194 * This routine doesn't need to be atomic.
196 static __inline__ int __constant_test_bit(int nr, const volatile void *addr)
198 return ((1UL << (nr & 31)) &
199 (((const volatile unsigned int *)addr)[nr >> 5])) != 0;
202 static __inline__ int __test_bit(int nr, volatile void *addr)
204 int *a = (int *)addr;
208 mask = 1 << (nr & 0x1f);
209 return ((mask & *a) != 0);
212 #define test_bit(nr,addr) \
213 (__builtin_constant_p(nr) ? \
214 __constant_test_bit((nr),(addr)) : \
215 __test_bit((nr),(addr)))
217 #define find_first_zero_bit(addr, size) \
218 find_next_zero_bit((addr), (size), 0)
220 static __inline__ int find_next_zero_bit(void *addr, int size, int offset)
222 unsigned long *p = ((unsigned long *)addr) + (offset >> 5);
223 unsigned long result = offset & ~31UL;
232 tmp |= ~0UL >> (32 - offset);
240 while (size & ~31UL) {
253 return result + ffz(tmp);
257 * hweightN: returns the hamming weight (i.e. the number
258 * of bits set) of a N-bit word
261 #define hweight32(x) generic_hweight32(x)
262 #define hweight16(x) generic_hweight16(x)
263 #define hweight8(x) generic_hweight8(x)
265 static __inline__ int ext2_set_bit(int nr, volatile void *addr)
269 volatile unsigned char *ADDR = (unsigned char *)addr;
272 mask = 1 << (nr & 0x07);
273 local_irq_save(flags);
274 retval = (mask & *ADDR) != 0;
276 local_irq_restore(flags);
280 static __inline__ int ext2_clear_bit(int nr, volatile void *addr)
284 volatile unsigned char *ADDR = (unsigned char *)addr;
287 mask = 1 << (nr & 0x07);
288 local_irq_save(flags);
289 retval = (mask & *ADDR) != 0;
291 local_irq_restore(flags);
295 static __inline__ int ext2_test_bit(int nr, const volatile void *addr)
298 const volatile unsigned char *ADDR = (const unsigned char *)addr;
301 mask = 1 << (nr & 0x07);
302 return ((mask & *ADDR) != 0);
305 #define ext2_find_first_zero_bit(addr, size) \
306 ext2_find_next_zero_bit((addr), (size), 0)
308 static __inline__ unsigned long ext2_find_next_zero_bit(void *addr,
310 unsigned long offset)
312 unsigned long *p = ((unsigned long *)addr) + (offset >> 5);
313 unsigned long result = offset & ~31UL;
322 tmp |= ~0UL >> (32 - offset);
330 while (size & ~31UL) {
343 return result + ffz(tmp);
346 /* Bitmap functions for the minix filesystem. */
347 #define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
348 #define minix_set_bit(nr,addr) set_bit(nr,addr)
349 #define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
350 #define minix_test_bit(nr,addr) test_bit(nr,addr)
351 #define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)