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/*-
* Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef __MACHINE_COUNTER_H__
#define __MACHINE_COUNTER_H__
#include <sys/pcpu.h>
#ifdef INVARIANTS
#include <sys/proc.h>
#endif
#include <machine/md_var.h>
#include <machine/specialreg.h>
#define counter_enter() do { \
if ((cpu_feature & CPUID_CX8) == 0) \
critical_enter(); \
} while (0)
#define counter_exit() do { \
if ((cpu_feature & CPUID_CX8) == 0) \
critical_exit(); \
} while (0)
static inline void
counter_64_inc_8b(uint64_t *p, int64_t inc)
{
__asm __volatile(
"movl %%fs:(%%esi),%%eax\n\t"
"movl %%fs:4(%%esi),%%edx\n"
"1:\n\t"
"movl %%eax,%%ebx\n\t"
"movl %%edx,%%ecx\n\t"
"addl (%%edi),%%ebx\n\t"
"adcl 4(%%edi),%%ecx\n\t"
"cmpxchg8b %%fs:(%%esi)\n\t"
"jnz 1b"
:
: "S" (p), "D" (&inc)
: "memory", "cc", "eax", "edx", "ebx", "ecx");
}
#define counter_u64_add_protected(c, inc) do { \
if ((cpu_feature & CPUID_CX8) == 0) { \
CRITICAL_ASSERT(curthread); \
*(uint64_t *)zpcpu_get(c) += (inc); \
} else \
counter_64_inc_8b((c), (inc)); \
} while (0)
static inline void
counter_u64_add(counter_u64_t c, int64_t inc)
{
if ((cpu_feature & CPUID_CX8) == 0) {
critical_enter();
*(uint64_t *)zpcpu_get(c) += inc;
critical_exit();
} else {
counter_64_inc_8b(c, inc);
}
}
#endif /* ! __MACHINE_COUNTER_H__ */
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