152 строки
3.8 KiB
C
152 строки
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _PERF_BITOPS_H
|
|
#define _PERF_BITOPS_H
|
|
|
|
#include <string.h>
|
|
#include <linux/bitops.h>
|
|
#include <stdlib.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#define DECLARE_BITMAP(name,bits) \
|
|
unsigned long name[BITS_TO_LONGS(bits)]
|
|
|
|
int __bitmap_weight(const unsigned long *bitmap, int bits);
|
|
void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
|
|
const unsigned long *bitmap2, int bits);
|
|
int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
|
|
const unsigned long *bitmap2, unsigned int bits);
|
|
void bitmap_clear(unsigned long *map, unsigned int start, int len);
|
|
|
|
#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
|
|
|
|
#define BITMAP_LAST_WORD_MASK(nbits) \
|
|
( \
|
|
((nbits) % BITS_PER_LONG) ? \
|
|
(1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \
|
|
)
|
|
|
|
#define small_const_nbits(nbits) \
|
|
(__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
|
|
|
|
static inline void bitmap_zero(unsigned long *dst, int nbits)
|
|
{
|
|
if (small_const_nbits(nbits))
|
|
*dst = 0UL;
|
|
else {
|
|
int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
|
|
memset(dst, 0, len);
|
|
}
|
|
}
|
|
|
|
static inline void bitmap_fill(unsigned long *dst, unsigned int nbits)
|
|
{
|
|
unsigned int nlongs = BITS_TO_LONGS(nbits);
|
|
if (!small_const_nbits(nbits)) {
|
|
unsigned int len = (nlongs - 1) * sizeof(unsigned long);
|
|
memset(dst, 0xff, len);
|
|
}
|
|
dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
|
|
}
|
|
|
|
static inline int bitmap_empty(const unsigned long *src, unsigned nbits)
|
|
{
|
|
if (small_const_nbits(nbits))
|
|
return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
|
|
|
|
return find_first_bit(src, nbits) == nbits;
|
|
}
|
|
|
|
static inline int bitmap_full(const unsigned long *src, unsigned int nbits)
|
|
{
|
|
if (small_const_nbits(nbits))
|
|
return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
|
|
|
|
return find_first_zero_bit(src, nbits) == nbits;
|
|
}
|
|
|
|
static inline int bitmap_weight(const unsigned long *src, int nbits)
|
|
{
|
|
if (small_const_nbits(nbits))
|
|
return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
|
|
return __bitmap_weight(src, nbits);
|
|
}
|
|
|
|
static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
|
|
const unsigned long *src2, int nbits)
|
|
{
|
|
if (small_const_nbits(nbits))
|
|
*dst = *src1 | *src2;
|
|
else
|
|
__bitmap_or(dst, src1, src2, nbits);
|
|
}
|
|
|
|
/**
|
|
* test_and_set_bit - Set a bit and return its old value
|
|
* @nr: Bit to set
|
|
* @addr: Address to count from
|
|
*/
|
|
static inline int test_and_set_bit(int nr, unsigned long *addr)
|
|
{
|
|
unsigned long mask = BIT_MASK(nr);
|
|
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
|
|
unsigned long old;
|
|
|
|
old = *p;
|
|
*p = old | mask;
|
|
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
/**
|
|
* test_and_clear_bit - Clear a bit and return its old value
|
|
* @nr: Bit to clear
|
|
* @addr: Address to count from
|
|
*/
|
|
static inline int test_and_clear_bit(int nr, unsigned long *addr)
|
|
{
|
|
unsigned long mask = BIT_MASK(nr);
|
|
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
|
|
unsigned long old;
|
|
|
|
old = *p;
|
|
*p = old & ~mask;
|
|
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
/**
|
|
* bitmap_alloc - Allocate bitmap
|
|
* @nbits: Number of bits
|
|
*/
|
|
static inline unsigned long *bitmap_alloc(int nbits)
|
|
{
|
|
return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
|
|
}
|
|
|
|
/*
|
|
* bitmap_scnprintf - print bitmap list into buffer
|
|
* @bitmap: bitmap
|
|
* @nbits: size of bitmap
|
|
* @buf: buffer to store output
|
|
* @size: size of @buf
|
|
*/
|
|
size_t bitmap_scnprintf(unsigned long *bitmap, int nbits,
|
|
char *buf, size_t size);
|
|
|
|
/**
|
|
* bitmap_and - Do logical and on bitmaps
|
|
* @dst: resulting bitmap
|
|
* @src1: operand 1
|
|
* @src2: operand 2
|
|
* @nbits: size of bitmap
|
|
*/
|
|
static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
|
|
const unsigned long *src2, unsigned int nbits)
|
|
{
|
|
if (small_const_nbits(nbits))
|
|
return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0;
|
|
return __bitmap_and(dst, src1, src2, nbits);
|
|
}
|
|
|
|
#endif /* _PERF_BITOPS_H */
|