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From NetBSD: merge of 960317

/*	$OpenBSD: kvm_sun3.c,v 1.1 1996/03/19 23:15:42 niklas Exp $	*/

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software developed by the Computer Systems
 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
 * BG 91-66 and contributed to Berkeley.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

/*
 * Sun3 machine dependent routines for kvm.  Hopefully, the forthcoming
 * vm code will one day obsolete this module.  Furthermore, I hope it
 * gets here soon, because this basically is an error stub! (sorry)
 */

#include <sys/param.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>

#include <vm/vm.h>
#include <vm/vm_param.h>

#include <limits.h>
#include <db.h>

#include "kvm_private.h"

struct vmstate {
	u_long end;
};

void
_kvm_freevtop(kd)
	kvm_t *kd;
{
	if (kd->vmst != 0)
		free(kd->vmst);
}

int
_kvm_initvtop(kd)
	kvm_t *kd;
{
	register int i;
	register int off;
	register struct vmstate *vm;
	struct stat st;
	struct nlist nlist[2];

	vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
	if (vm == 0)
		return (-1);

	kd->vmst = vm;

	if (fstat(kd->pmfd, &st) < 0)
		return (-1);

	/* Get end of kernel address */
	nlist[0].n_name = "_end";
	nlist[1].n_name = 0;
	if (kvm_nlist(kd, nlist) != 0) {
		_kvm_err(kd, kd->program, "pmap_stod: no such symbol");
		return (-1);
	}
	vm->end = (u_long)nlist[0].n_value;

	return (0);
}

#define VA_OFF(va) (va & (NBPG - 1))

/*
 * Translate a kernel virtual address to a physical address using the
 * mapping information in kd->vm.  Returns the result in pa, and returns
 * the number of bytes that are contiguously available from this 
 * physical address.  This routine is used only for crashdumps.
 */
int
_kvm_kvatop(kd, va, pa)
	kvm_t *kd;
	u_long va;
	u_long *pa;
{
	register int end;

	if (va < KERNBASE) {
		_kvm_err(kd, 0, "invalid address (%x<%x)", va, KERNBASE);
		return (0);
	}

	end = kd->vmst->end;
	if (va >= end) {
		_kvm_err(kd, 0, "invalid address (%x>=%x)", va, end);
		return (0);
	}

	*pa = (va - KERNBASE);
	return (end - va);
}