/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_BITOPS_H #define _LINUX_BITOPS_H #include <asm/types.h> #include <linux/bits.h> #include <linux/typecheck.h> #include <uapi/linux/kernel.h> #define BITS_PER_TYPE(type) … #define BITS_TO_LONGS(nr) … #define BITS_TO_U64(nr) … #define BITS_TO_U32(nr) … #define BITS_TO_BYTES(nr) … #define BYTES_TO_BITS(nb) … extern unsigned int __sw_hweight8(unsigned int w); extern unsigned int __sw_hweight16(unsigned int w); extern unsigned int __sw_hweight32(unsigned int w); extern unsigned long __sw_hweight64(__u64 w); /* * Defined here because those may be needed by architecture-specific static * inlines. */ #include <asm-generic/bitops/generic-non-atomic.h> /* * Many architecture-specific non-atomic bitops contain inline asm code and due * to that the compiler can't optimize them to compile-time expressions or * constants. In contrary, generic_*() helpers are defined in pure C and * compilers optimize them just well. * Therefore, to make `unsigned long foo = 0; __set_bit(BAR, &foo)` effectively * equal to `unsigned long foo = BIT(BAR)`, pick the generic C alternative when * the arguments can be resolved at compile time. That expression itself is a * constant and doesn't bring any functional changes to the rest of cases. * The casts to `uintptr_t` are needed to mitigate `-Waddress` warnings when * passing a bitmap from .bss or .data (-> `!!addr` is always true). */ #define bitop(op, nr, addr) … /* * The following macros are non-atomic versions of their non-underscored * counterparts. */ #define __set_bit(nr, addr) … #define __clear_bit(nr, addr) … #define __change_bit(nr, addr) … #define __test_and_set_bit(nr, addr) … #define __test_and_clear_bit(nr, addr) … #define __test_and_change_bit(nr, addr) … #define test_bit(nr, addr) … #define test_bit_acquire(nr, addr) … /* * Include this here because some architectures need generic_ffs/fls in * scope */ #include <asm/bitops.h> /* Check that the bitops prototypes are sane */ #define __check_bitop_pr … __check_bitop_pr; __check_bitop_pr; __check_bitop_pr; __check_bitop_pr; __check_bitop_pr; __check_bitop_pr; __check_bitop_pr; __check_bitop_pr; #undef __check_bitop_pr static inline int get_bitmask_order(unsigned int count) { … } static __always_inline unsigned long hweight_long(unsigned long w) { … } /** * rol64 - rotate a 64-bit value left * @word: value to rotate * @shift: bits to roll */ static inline __u64 rol64(__u64 word, unsigned int shift) { … } /** * ror64 - rotate a 64-bit value right * @word: value to rotate * @shift: bits to roll */ static inline __u64 ror64(__u64 word, unsigned int shift) { … } /** * rol32 - rotate a 32-bit value left * @word: value to rotate * @shift: bits to roll */ static inline __u32 rol32(__u32 word, unsigned int shift) { … } /** * ror32 - rotate a 32-bit value right * @word: value to rotate * @shift: bits to roll */ static inline __u32 ror32(__u32 word, unsigned int shift) { … } /** * rol16 - rotate a 16-bit value left * @word: value to rotate * @shift: bits to roll */ static inline __u16 rol16(__u16 word, unsigned int shift) { … } /** * ror16 - rotate a 16-bit value right * @word: value to rotate * @shift: bits to roll */ static inline __u16 ror16(__u16 word, unsigned int shift) { … } /** * rol8 - rotate an 8-bit value left * @word: value to rotate * @shift: bits to roll */ static inline __u8 rol8(__u8 word, unsigned int shift) { … } /** * ror8 - rotate an 8-bit value right * @word: value to rotate * @shift: bits to roll */ static inline __u8 ror8(__u8 word, unsigned int shift) { … } /** * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit * @value: value to sign extend * @index: 0 based bit index (0<=index<32) to sign bit * * This is safe to use for 16- and 8-bit types as well. */ static __always_inline __s32 sign_extend32(__u32 value, int index) { … } /** * sign_extend64 - sign extend a 64-bit value using specified bit as sign-bit * @value: value to sign extend * @index: 0 based bit index (0<=index<64) to sign bit */ static __always_inline __s64 sign_extend64(__u64 value, int index) { … } static inline unsigned int fls_long(unsigned long l) { … } static inline int get_count_order(unsigned int count) { … } /** * get_count_order_long - get order after rounding @l up to power of 2 * @l: parameter * * it is same as get_count_order() but with long type parameter */ static inline int get_count_order_long(unsigned long l) { … } /** * __ffs64 - find first set bit in a 64 bit word * @word: The 64 bit word * * On 64 bit arches this is a synonym for __ffs * The result is not defined if no bits are set, so check that @word * is non-zero before calling this. */ static inline unsigned int __ffs64(u64 word) { … } /** * fns - find N'th set bit in a word * @word: The word to search * @n: Bit to find */ static inline unsigned int fns(unsigned long word, unsigned int n) { … } /** * assign_bit - Assign value to a bit in memory * @nr: the bit to set * @addr: the address to start counting from * @value: the value to assign */ #define assign_bit(nr, addr, value) … #define __assign_bit(nr, addr, value) … /** * __ptr_set_bit - Set bit in a pointer's value * @nr: the bit to set * @addr: the address of the pointer variable * * Example: * void *p = foo(); * __ptr_set_bit(bit, &p); */ #define __ptr_set_bit(nr, addr) … /** * __ptr_clear_bit - Clear bit in a pointer's value * @nr: the bit to clear * @addr: the address of the pointer variable * * Example: * void *p = foo(); * __ptr_clear_bit(bit, &p); */ #define __ptr_clear_bit(nr, addr) … /** * __ptr_test_bit - Test bit in a pointer's value * @nr: the bit to test * @addr: the address of the pointer variable * * Example: * void *p = foo(); * if (__ptr_test_bit(bit, &p)) { * ... * } else { * ... * } */ #define __ptr_test_bit(nr, addr) … #ifdef __KERNEL__ #ifndef set_mask_bits #define set_mask_bits(ptr, mask, bits) … #endif #ifndef bit_clear_unless #define bit_clear_unless(ptr, clear, test) … #endif #endif /* __KERNEL__ */ #endif
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