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memdev.c
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memutil.c
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Editing: memutil.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2004 Mark R V Murray * 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 * in this position and unchanged. * 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 AUTHORS ``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 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/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/malloc.h> #include <sys/memrange.h> #include <sys/rwlock.h> #include <sys/systm.h> static struct rwlock mr_lock; /* * Implementation-neutral, kernel-callable functions for manipulating * memory range attributes. */ void mem_range_init(void) { if (mem_range_softc.mr_op == NULL) return; rw_init(&mr_lock, "memrange"); mem_range_softc.mr_op->init(&mem_range_softc); } void mem_range_destroy(void) { if (mem_range_softc.mr_op == NULL) return; rw_destroy(&mr_lock); } int mem_range_attr_get(struct mem_range_desc *mrd, int *arg) { int nd; if (mem_range_softc.mr_op == NULL) return (EOPNOTSUPP); nd = *arg; rw_rlock(&mr_lock); if (nd == 0) *arg = mem_range_softc.mr_ndesc; else bcopy(mem_range_softc.mr_desc, mrd, nd * sizeof(*mrd)); rw_runlock(&mr_lock); return (0); } int mem_range_attr_set(struct mem_range_desc *mrd, int *arg) { int ret; if (mem_range_softc.mr_op == NULL) return (EOPNOTSUPP); rw_wlock(&mr_lock); ret = mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg); rw_wunlock(&mr_lock); return (ret); }
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