161 lines
3.7 KiB
C
161 lines
3.7 KiB
C
#ifndef _PERF_LINUX_BITOPS_H_
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#define _PERF_LINUX_BITOPS_H_
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#include <linux/kernel.h>
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#include <linux/compiler.h>
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#include <asm/hweight.h>
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#ifndef __WORDSIZE
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#define __WORDSIZE (__SIZEOF_LONG__ * 8)
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#endif
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#define BITS_PER_LONG __WORDSIZE
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#define BITS_PER_BYTE 8
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#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
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#define BITS_TO_U64(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u64))
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#define BITS_TO_U32(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u32))
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#define BITS_TO_BYTES(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE)
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#define for_each_set_bit(bit, addr, size) \
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for ((bit) = find_first_bit((addr), (size)); \
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(bit) < (size); \
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(bit) = find_next_bit((addr), (size), (bit) + 1))
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/* same as for_each_set_bit() but use bit as value to start with */
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#define for_each_set_bit_from(bit, addr, size) \
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for ((bit) = find_next_bit((addr), (size), (bit)); \
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(bit) < (size); \
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(bit) = find_next_bit((addr), (size), (bit) + 1))
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static inline void set_bit(int nr, unsigned long *addr)
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{
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addr[nr / BITS_PER_LONG] |= 1UL << (nr % BITS_PER_LONG);
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}
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static inline void clear_bit(int nr, unsigned long *addr)
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{
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addr[nr / BITS_PER_LONG] &= ~(1UL << (nr % BITS_PER_LONG));
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}
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static __always_inline int test_bit(unsigned int nr, const unsigned long *addr)
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{
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return ((1UL << (nr % BITS_PER_LONG)) &
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(((unsigned long *)addr)[nr / BITS_PER_LONG])) != 0;
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}
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static inline unsigned long hweight_long(unsigned long w)
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{
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return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
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}
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#define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)
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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 __always_inline unsigned long __ffs(unsigned long word)
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{
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int num = 0;
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#if BITS_PER_LONG == 64
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if ((word & 0xffffffff) == 0) {
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num += 32;
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word >>= 32;
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}
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#endif
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if ((word & 0xffff) == 0) {
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num += 16;
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word >>= 16;
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}
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if ((word & 0xff) == 0) {
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num += 8;
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word >>= 8;
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}
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if ((word & 0xf) == 0) {
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num += 4;
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word >>= 4;
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}
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if ((word & 0x3) == 0) {
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num += 2;
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word >>= 2;
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}
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if ((word & 0x1) == 0)
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num += 1;
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return num;
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}
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typedef const unsigned long __attribute__((__may_alias__)) long_alias_t;
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/*
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* Find the first set bit in a memory region.
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*/
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static inline unsigned long
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find_first_bit(const unsigned long *addr, unsigned long size)
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{
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long_alias_t *p = (long_alias_t *) addr;
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unsigned long result = 0;
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unsigned long tmp;
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while (size & ~(BITS_PER_LONG-1)) {
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if ((tmp = *(p++)))
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goto found;
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result += BITS_PER_LONG;
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size -= BITS_PER_LONG;
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}
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if (!size)
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return result;
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tmp = (*p) & (~0UL >> (BITS_PER_LONG - size));
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if (tmp == 0UL) /* Are any bits set? */
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return result + size; /* Nope. */
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found:
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return result + __ffs(tmp);
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}
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/*
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* Find the next set bit in a memory region.
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*/
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static inline unsigned long
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find_next_bit(const unsigned long *addr, unsigned long size, unsigned long offset)
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{
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const unsigned long *p = addr + BITOP_WORD(offset);
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unsigned long result = offset & ~(BITS_PER_LONG-1);
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unsigned long tmp;
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if (offset >= size)
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return size;
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size -= result;
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offset %= BITS_PER_LONG;
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if (offset) {
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tmp = *(p++);
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tmp &= (~0UL << offset);
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if (size < BITS_PER_LONG)
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goto found_first;
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if (tmp)
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goto found_middle;
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size -= BITS_PER_LONG;
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result += BITS_PER_LONG;
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}
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while (size & ~(BITS_PER_LONG-1)) {
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if ((tmp = *(p++)))
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goto found_middle;
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result += BITS_PER_LONG;
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size -= BITS_PER_LONG;
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}
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if (!size)
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return result;
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tmp = *p;
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found_first:
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tmp &= (~0UL >> (BITS_PER_LONG - size));
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if (tmp == 0UL) /* Are any bits set? */
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return result + size; /* Nope. */
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found_middle:
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return result + __ffs(tmp);
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}
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#endif
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