2 * Copyright 1995, Russell King.
3 * Various bits and pieces copyrights include:
4 * Linus Torvalds (test_bit).
6 * Copyright (C) 2011 Andes Technology Corporation
7 * Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
9 * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
11 * Please note that the code in this file should never be included
12 * from user space. Many of these are not implemented in assembler
13 * since they would be too costly. Also, they require priviledged
14 * instructions (which are not available from user mode) to ensure
15 * that they are atomic.
18 #ifndef __ASM_NDS_BITOPS_H
19 #define __ASM_NDS_BITOPS_H
23 #include <asm/system.h>
24 #include <asm-generic/bitops/fls.h>
25 #include <asm-generic/bitops/__fls.h>
26 #include <asm-generic/bitops/fls64.h>
27 #include <asm-generic/bitops/__ffs.h>
29 #define smp_mb__before_clear_bit() do { } while (0)
30 #define smp_mb__after_clear_bit() do { } while (0)
33 * Function prototypes to keep gcc -Wall happy.
35 extern void set_bit(int nr, void *addr);
37 static inline void __set_bit(int nr, void *addr)
43 mask = 1 << (nr & 0x1f);
47 extern void clear_bit(int nr, void *addr);
49 static inline void __clear_bit(int nr, void *addr)
56 mask = 1 << (nr & 0x1f);
57 local_irq_save(flags);
59 local_irq_restore(flags);
62 extern void change_bit(int nr, void *addr);
64 static inline void __change_bit(int nr, void *addr)
67 unsigned long *ADDR = (unsigned long *)addr;
70 mask = 1 << (nr & 31);
74 extern int test_and_set_bit(int nr, void *addr);
76 static inline int __test_and_set_bit(int nr, void *addr)
79 unsigned int *a = (unsigned int *)addr;
82 mask = 1 << (nr & 0x1f);
83 retval = (mask & *a) != 0;
88 extern int test_and_clear_bit(int nr, void *addr);
90 static inline int __test_and_clear_bit(int nr, void *addr)
93 unsigned int *a = (unsigned int *)addr;
96 mask = 1 << (nr & 0x1f);
97 retval = (mask & *a) != 0;
102 extern int test_and_change_bit(int nr, void *addr);
104 static inline int __test_and_change_bit(int nr, void *addr)
107 unsigned int *a = (unsigned int *)addr;
110 mask = 1 << (nr & 0x1f);
111 retval = (mask & *a) != 0;
116 extern int find_first_zero_bit(void *addr, unsigned size);
117 extern int find_next_zero_bit(void *addr, int size, int offset);
120 * This routine doesn't need to be atomic.
122 static inline int test_bit(int nr, const void *addr)
124 return ((unsigned char *) addr)[nr >> 3] & (1U << (nr & 7));
128 * ffz = Find First Zero in word. Undefined if no zero exists,
129 * so code should check against ~0UL first..
131 static inline unsigned long ffz(unsigned long word)
137 if (word & 0x0000ffff) {
138 k -= 16; word <<= 16;
140 if (word & 0x00ff0000) {
143 if (word & 0x0f000000) {
146 if (word & 0x30000000) {
149 if (word & 0x40000000)
156 * ffs: find first bit set. This is defined the same way as
157 * the libc and compiler builtin ffs routines, therefore
158 * differs in spirit from the above ffz (man ffs).
162 * redefined in include/linux/bitops.h
163 * #define ffs(x) generic_ffs(x)
167 * hweightN: returns the hamming weight (i.e. the number
168 * of bits set) of a N-bit word
171 #define hweight32(x) generic_hweight32(x)
172 #define hweight16(x) generic_hweight16(x)
173 #define hweight8(x) generic_hweight8(x)
175 #define ext2_set_bit test_and_set_bit
176 #define ext2_clear_bit test_and_clear_bit
177 #define ext2_test_bit test_bit
178 #define ext2_find_first_zero_bit find_first_zero_bit
179 #define ext2_find_next_zero_bit find_next_zero_bit
181 /* Bitmap functions for the minix filesystem. */
182 #define minix_test_and_set_bit(nr, addr) test_and_set_bit(nr, addr)
183 #define minix_set_bit(nr, addr) set_bit(nr, addr)
184 #define minix_test_and_clear_bit(nr, addr) test_and_clear_bit(nr, addr)
185 #define minix_test_bit(nr, addr) test_bit(nr, addr)
186 #define minix_find_first_zero_bit(addr, size) find_first_zero_bit(addr, size)
188 #endif /* __KERNEL__ */
190 #endif /* __ASM_NDS_BITOPS_H */