85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/* $NetBSD: percpu.c,v 1.2 2008/10/11 16:23:24 pooka Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2008 Antti Kantee. 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 ``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.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kmem.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/percpu.h>
|
|
|
|
#include <machine/cpu.h>
|
|
|
|
/*
|
|
* A poor-man's userspace percpu emulation. Since we can't disable
|
|
* preemption currently, use a mutex. Not the world's most efficient
|
|
* method, but quite enough. Hence, we can have only one cpu.
|
|
*/
|
|
|
|
static kmutex_t pcmtx;
|
|
|
|
void
|
|
percpu_init()
|
|
{
|
|
|
|
mutex_init(&pcmtx, MUTEX_DEFAULT, IPL_NONE);
|
|
}
|
|
|
|
void *
|
|
percpu_getref(percpu_t *pc)
|
|
{
|
|
|
|
mutex_enter(&pcmtx);
|
|
return pc;
|
|
}
|
|
|
|
void
|
|
percpu_putref(percpu_t *pc)
|
|
{
|
|
|
|
mutex_exit(&pcmtx);
|
|
}
|
|
|
|
percpu_t *
|
|
percpu_alloc(size_t size)
|
|
{
|
|
|
|
return kmem_alloc(size, KM_SLEEP);
|
|
}
|
|
|
|
void
|
|
percpu_free(percpu_t *pc, size_t size)
|
|
{
|
|
|
|
kmem_free(pc, size);
|
|
}
|
|
|
|
void
|
|
percpu_foreach(percpu_t *pc, percpu_callback_t cb, void *arg)
|
|
{
|
|
|
|
cb(pc, arg, &rump_cpu);
|
|
}
|