/*	$NetBSD: mips.c,v 1.2 2021/12/11 19:24:22 mrg Exp $	*/

/*
 * Copyright (c) 2020 Matthew R. Green
 * 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 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>
#ifndef lint
__RCSID("$NetBSD: mips.c,v 1.2 2021/12/11 19:24:22 mrg Exp $");
#endif /* not lint */

#include <ddb/ddb.h>

#include <kvm.h>
#include <nlist.h>
#include <err.h>
#include <stdlib.h>

#include <machine/pcb.h>

#include "extern.h"

static struct nlist nl[] = {
	{ .n_name = "dumppcb" },
	{ .n_name = "cpu_switchto" },
	{ .n_name = NULL },
};

struct pcb	pcb;

void
db_mach_init(kvm_t *kd)
{

	if (kvm_nlist(kd, nl) == -1) {
		errx(EXIT_FAILURE, "kvm_nlist: %s", kvm_geterr(kd));
	}
	if ((size_t)kvm_read(kd, nl[0].n_value, &pcb, sizeof(pcb)) !=
	    sizeof(pcb)) {
		warnx("cannot read dumppcb: %s", kvm_geterr(kd));
	}
}

/* Provided for db_trace.c. */
vaddr_t
db_mach_addr_cpuswitch(void)
{
	return (vaddr_t)nl[1].n_value;
}