/*	$NetBSD: kvm_sun3.c,v 1.4 1996/05/05 04:32:18 gwr 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)kvm_sparc.c	8.1 (Berkeley) 6/4/93";
#else
static char *rcsid = "$NetBSD: kvm_sun3.c,v 1.4 1996/05/05 04:32:18 gwr Exp $";
#endif
#endif /* LIBC_SCCS and not lint */

/*
 * Sun3 machine dependent routines for kvm.
 */

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

#include <sys/core.h>
#include <sys/exec_aout.h>
#include <sys/kcore.h>

#include <unistd.h>
#include <limits.h>
#include <nlist.h>
#include <kvm.h>
#include <db.h>

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

#include <machine/kcore.h>
#include <machine/pte.h>

#include "kvm_private.h"

#define NKSEG (NSEGMAP/8)	/* kernel segmap entries */
struct vmstate {
	/* Page Map Entry Group (PMEG) */
	int   pmeg[NKSEG][NPAGSEG];
};

/*
 * Prepare for translation of kernel virtual addresses into offsets
 * into crash dump files. We use the MMU specific goop written at the
 * beginning of a crash dump by dumpsys()
 * Note: sun3 MMU specific!
 */
int
_kvm_initvtop(kd)
	kvm_t *kd;
{
	register char *p;

	p = kd->cpu_data;
	p += (NBPG - sizeof(kcore_seg_t));
	kd->vmst = (struct vmstate *)p;

	return (0);
}

void
_kvm_freevtop(kd)
	kvm_t *kd;
{
	/* This was set by pointer arithmetic, not allocation. */
	kd->vmst = (void*)0;
}

/*
 * 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, pap)
	kvm_t *kd;
	u_long va;
	u_long *pap;
{
	register cpu_kcore_hdr_t *ckh;
	u_int segnum, sme, ptenum;
	int pte, offset;
	u_long pa;

	if (ISALIVE(kd)) {
		_kvm_err(kd, 0, "vatop called in live kernel!");
		return((off_t)0);
	}
	ckh = kd->cpu_data;

	if (va < KERNBASE) {
		_kvm_err(kd, 0, "not a kernel address");
		return((off_t)0);
	}

	/*
	 * Get the segmap entry (sme) from the kernel segmap.
	 * Note: only have segmap entries from KERNBASE to end.
	 */
	segnum = VA_SEGNUM(va - KERNBASE);
	ptenum = VA_PTE_NUM(va);
	offset = va & PGOFSET;

	/* The segmap entry selects a PMEG. */
	sme = ckh->ksegmap[segnum];
	pte = kd->vmst->pmeg[sme][ptenum];

	if ((pte & PG_VALID) == 0) {
		_kvm_err(kd, 0, "page not valid (VA=0x%x)", va);
		return (0);
	}
	pa = PG_PA(pte) + offset;

	*pap = pa;
	return (NBPG - offset);
}

/*
 * Translate a physical address to a file-offset in the crash-dump.
 */
off_t
_kvm_pa2off(kd, pa)
	kvm_t	*kd;
	u_long	pa;
{
	return(kd->dump_off + pa);
}