/*
 * Copyright (c) 2003-2004.  Hiten Pandya <hmp@backplane.com>.
 * 
 * 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 HITEN PANDYA 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 HITEN PANDYA 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.
 *
 * $DragonFly: src/lib/libkvm/kvm_util.c,v 1.1 2004/04/02 05:46:02 hmp Exp $
 */

/*
 * Useful functions that are used across the source base for
 * various purpose.
 */

#include <sys/param.h>
#include <sys/nchstats.h>
#include <sys/sysctl.h>

#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <err.h>

/*
 * Aggregate the per-cpu counters we retrieved via sysctl(2)
 * to give the total across the CPUs.  Use a nasty trick to
 * aggregate the counters in the structure! YYY
 */
void
kvm_nch_cpuagg(struct nchstats *unagg, struct nchstats *ttl, int cpucnt)
{
	int i, off, siz;
	siz = sizeof(struct nchstats);

	if (!unagg && !ttl)
		return;

	bzero(ttl, siz);
	
	/* kick hmp@ for this nasty loop! :-) */
	for (i = 0; i < cpucnt; ++i) {
		for (off = 0; off < siz; off += sizeof(u_long)) {
			*(u_long *)((char *)(*(&ttl)) + off) +=
			*(u_long *)((char *)&unagg[i] + off);
		}
	}
}