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/*
* Copyright (C) 2009 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License (not later!)
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#ifndef _CPU_H
#define _CPU_H
#include <stdint.h>
#include <stdbool.h>
static inline int cpu_isset(uint64_t *cpu_mask, int cpu)
{
uint64_t mask;
mask = *(cpu_mask + (cpu >> 6));
return mask & (1ULL << (cpu & ((1ULL << 6) - 1)));
}
static inline bool cpu_allset(uint64_t *cpu_mask, int max_cpus)
{
int cpu;
for (cpu = 0; cpu < max_cpus; cpu++) {
if (!cpu_isset(cpu_mask, cpu))
return false;
}
return true;
}
static inline void cpu_set(uint64_t *cpu_mask, int cpu)
{
uint64_t *mask;
mask = cpu_mask + (cpu >> 6);
*mask |= (1ULL << (cpu & ((1ULL << 6) - 1)));
}
static inline void cpu_clear(uint64_t *cpu_mask, int cpu)
{
uint64_t *mask;
mask = cpu_mask + (cpu >> 6);
*mask &= ~(1ULL << (cpu & ((1ULL << 6) - 1)));
}
static inline void set_cpus(uint64_t *cpu_mask, int cpus)
{
int idx;
for (idx = 0; idx < (cpus >> 6); idx++) {
*(cpu_mask + idx) = -1ULL;
}
*(cpu_mask) = (1ULL << (cpus & ((1ULL << 6) - 1))) - 1;
}
static inline bool cpus_equal(uint64_t *a_mask, uint64_t *b_mask,
int cpus)
{
int idx;
for (idx = 0; idx < (cpus >> 6) + 1; idx++) {
if (*(a_mask + idx) != *(b_mask + idx))
return false;
}
return true;
}
/* Hamming weight */
static inline unsigned int hweight(unsigned int mask)
{
uint64_t w = mask;
w -= (w >> 1) & 0x5555555555555555ul;
w = (w & 0x3333333333333333ul) + ((w >> 2) & 0x3333333333333333ul);
w = (w + (w >> 4)) & 0x0f0f0f0f0f0f0f0ful;
return (w * 0x0101010101010101ul) >> 56;
}
static inline unsigned int cpu_weight(uint64_t *cpu_mask, unsigned int cpus)
{
unsigned int weight = 0;
int idx;
for (idx = 0; idx < (cpus >> 6) + 1; idx++)
weight += hweight(*(cpu_mask + idx));
return weight;
}
#endif /* _CPU_H */
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