162 lines
3.7 KiB
C
162 lines
3.7 KiB
C
#ifndef _X86_64_BITOPS_H
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#define _X86_64_BITOPS_H
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/*
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* Copyright 1992, Linus Torvalds.
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*/
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extern long find_first_zero_bit(const unsigned long *addr, unsigned long size);
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extern long find_next_zero_bit(const unsigned long *addr, long size, long offset);
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extern long find_first_bit(const unsigned long *addr, unsigned long size);
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extern long find_next_bit(const unsigned long *addr, long size, long offset);
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/* return index of first bet set in val or max when no bit is set */
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static inline long __scanbit(unsigned long val, unsigned long max)
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{
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asm("bsfq %1,%0 ; cmovz %2,%0" : "=&r" (val) : "r" (val), "r" (max));
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return val;
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}
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#define find_next_bit(addr,size,off) \
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((__builtin_constant_p(size) && (size) <= BITS_PER_LONG ? \
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((off) + (__scanbit((*(unsigned long *)addr) >> (off),(size)-(off)))) : \
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find_next_bit(addr,size,off)))
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#define find_next_zero_bit(addr,size,off) \
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((__builtin_constant_p(size) && (size) <= BITS_PER_LONG ? \
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((off)+(__scanbit(~(((*(unsigned long *)addr)) >> (off)),(size)-(off)))) : \
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find_next_zero_bit(addr,size,off)))
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#define find_first_bit(addr, size) \
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((__builtin_constant_p((size)) && (size) <= BITS_PER_LONG \
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? (__scanbit(*(unsigned long *)(addr), (size))) \
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: find_first_bit((addr), (size))))
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#define find_first_zero_bit(addr, size) \
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((__builtin_constant_p((size)) && (size) <= BITS_PER_LONG \
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? (__scanbit(~*(unsigned long *)(addr), (size))) \
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: find_first_zero_bit((addr), (size))))
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static inline void set_bit_string(unsigned long *bitmap, unsigned long i,
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int len)
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{
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unsigned long end = i + len;
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while (i < end) {
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__set_bit(i, bitmap);
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i++;
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}
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}
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/**
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* ffz - find first zero in word.
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* @word: The word to search
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*
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* Undefined if no zero exists, so code should check against ~0UL first.
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*/
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static inline unsigned long ffz(unsigned long word)
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{
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__asm__("bsfq %1,%0"
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:"=r" (word)
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:"r" (~word));
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return word;
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}
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/**
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* __ffs - find first bit in word.
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* @word: The word to search
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*
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* Undefined if no bit exists, so code should check against 0 first.
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*/
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static inline unsigned long __ffs(unsigned long word)
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{
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__asm__("bsfq %1,%0"
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:"=r" (word)
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:"rm" (word));
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return word;
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}
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/*
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* __fls: find last bit set.
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* @word: The word to search
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*
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* Undefined if no zero exists, so code should check against ~0UL first.
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*/
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static inline unsigned long __fls(unsigned long word)
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{
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__asm__("bsrq %1,%0"
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:"=r" (word)
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:"rm" (word));
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return word;
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}
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#ifdef __KERNEL__
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#include <asm-generic/bitops/sched.h>
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/**
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* ffs - find first bit set
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* @x: the word to search
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*
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* This is defined the same way as
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* the libc and compiler builtin ffs routines, therefore
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* differs in spirit from the above ffz (man ffs).
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*/
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static inline int ffs(int x)
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{
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int r;
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__asm__("bsfl %1,%0\n\t"
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"cmovzl %2,%0"
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: "=r" (r) : "rm" (x), "r" (-1));
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return r+1;
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}
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/**
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* fls64 - find last bit set in 64 bit word
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* @x: the word to search
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*
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* This is defined the same way as fls.
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*/
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static inline int fls64(__u64 x)
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{
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if (x == 0)
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return 0;
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return __fls(x) + 1;
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}
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/**
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* fls - find last bit set
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* @x: the word to search
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*
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* This is defined the same way as ffs.
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*/
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static inline int fls(int x)
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{
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int r;
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__asm__("bsrl %1,%0\n\t"
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"cmovzl %2,%0"
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: "=&r" (r) : "rm" (x), "rm" (-1));
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return r+1;
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}
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#define ARCH_HAS_FAST_MULTIPLIER 1
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#include <asm-generic/bitops/hweight.h>
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#endif /* __KERNEL__ */
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#ifdef __KERNEL__
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#include <asm-generic/bitops/ext2-non-atomic.h>
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#define ext2_set_bit_atomic(lock, nr, addr) \
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test_and_set_bit((nr), (unsigned long *)(addr))
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#define ext2_clear_bit_atomic(lock, nr, addr) \
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test_and_clear_bit((nr), (unsigned long *)(addr))
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#include <asm-generic/bitops/minix.h>
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#endif /* __KERNEL__ */
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#endif /* _X86_64_BITOPS_H */
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