include/linux/bitops.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _TOOLS_LINUX_BITOPS_H_
0003 #define _TOOLS_LINUX_BITOPS_H_
0004
0005 #include <asm/types.h>
0006 #include <limits.h>
0007 #ifndef __WORDSIZE
0008 #define __WORDSIZE (__SIZEOF_LONG__ * 8)
0009 #endif
0010
0011 #ifndef BITS_PER_LONG
0012 # define BITS_PER_LONG __WORDSIZE
0013 #endif
0014 #include <linux/bits.h>
0015 #include <linux/compiler.h>
0016
0017 #define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE)
0018 #define BITS_TO_LONGS(nr)   DIV_ROUND_UP(nr, BITS_PER_TYPE(long))
0019 #define BITS_TO_U64(nr)     DIV_ROUND_UP(nr, BITS_PER_TYPE(u64))
0020 #define BITS_TO_U32(nr)     DIV_ROUND_UP(nr, BITS_PER_TYPE(u32))
0021 #define BITS_TO_BYTES(nr)   DIV_ROUND_UP(nr, BITS_PER_TYPE(char))
0022
0023 extern unsigned int __sw_hweight8(unsigned int w);
0024 extern unsigned int __sw_hweight16(unsigned int w);
0025 extern unsigned int __sw_hweight32(unsigned int w);
0026 extern unsigned long __sw_hweight64(__u64 w);
0027
0028 /*
0029  * Defined here because those may be needed by architecture-specific static
0030  * inlines.
0031  */
0032
0033 #define bitop(op, nr, addr)                     \
0034     op(nr, addr)
0035
0036 #define __set_bit(nr, addr)     bitop(___set_bit, nr, addr)
0037 #define __clear_bit(nr, addr)       bitop(___clear_bit, nr, addr)
0038 #define __change_bit(nr, addr)      bitop(___change_bit, nr, addr)
0039 #define __test_and_set_bit(nr, addr)    bitop(___test_and_set_bit, nr, addr)
0040 #define __test_and_clear_bit(nr, addr)  bitop(___test_and_clear_bit, nr, addr)
0041 #define __test_and_change_bit(nr, addr) bitop(___test_and_change_bit, nr, addr)
0042 #define test_bit(nr, addr)      bitop(_test_bit, nr, addr)
0043
0044 /*
0045  * Include this here because some architectures need generic_ffs/fls in
0046  * scope
0047  *
0048  * XXX: this needs to be asm/bitops.h, when we get to per arch optimizations
0049  */
0050 #include <asm-generic/bitops.h>
0051
0052 #define for_each_set_bit(bit, addr, size) \
0053     for ((bit) = find_first_bit((addr), (size));        \
0054          (bit) < (size);                    \
0055          (bit) = find_next_bit((addr), (size), (bit) + 1))
0056
0057 #define for_each_clear_bit(bit, addr, size) \
0058     for ((bit) = find_first_zero_bit((addr), (size));       \
0059          (bit) < (size);                                    \
0060          (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
0061
0062 /* same as for_each_set_bit() but use bit as value to start with */
0063 #define for_each_set_bit_from(bit, addr, size) \
0064     for ((bit) = find_next_bit((addr), (size), (bit));  \
0065          (bit) < (size);                    \
0066          (bit) = find_next_bit((addr), (size), (bit) + 1))
0067
0068 static inline unsigned long hweight_long(unsigned long w)
0069 {
0070     return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
0071 }
0072
0073 static inline unsigned fls_long(unsigned long l)
0074 {
0075     if (sizeof(l) == 4)
0076         return fls(l);
0077     return fls64(l);
0078 }
0079
0080 /**
0081  * rol32 - rotate a 32-bit value left
0082  * @word: value to rotate
0083  * @shift: bits to roll
0084  */
0085 static inline __u32 rol32(__u32 word, unsigned int shift)
0086 {
0087     return (word << shift) | (word >> ((-shift) & 31));
0088 }
0089
0090 #endif