GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libkvm/kvm_amd64.c Lines: 0 64 0.0 %
Date: 2017-11-13 Branches: 0 30 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: kvm_amd64.c,v 1.13 2015/12/19 18:40:30 mmcc Exp $	*/
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/*	$NetBSD: kvm_x86_64.c,v 1.3 2002/06/05 22:01:55 fvdl Exp $	*/
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/*-
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 * Copyright (c) 1989, 1992, 1993
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 *	The Regents of the University of California.  All rights reserved.
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 *
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 * This code is derived from software developed by the Computer Systems
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 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
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 * BG 91-66 and contributed to Berkeley.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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/*
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 * x86-64 machine dependent routines for kvm.
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 */
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#include <sys/param.h>	/* MAXCOMLEN */
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <sys/kcore.h>
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#include <machine/kcore.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <nlist.h>
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#include <kvm.h>
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#include <uvm/uvm_extern.h>
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#include <limits.h>
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#include <db.h>
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#include "kvm_private.h"
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#include <machine/pmap.h>
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#include <machine/pte.h>
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#include <machine/vmparam.h>
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void
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_kvm_freevtop(kvm_t *kd)
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{
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	/* Not actually used for anything right now, but safe. */
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	free(kd->vmst);
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	kd->vmst = NULL;
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}
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/*ARGSUSED*/
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int
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_kvm_initvtop(kvm_t *kd)
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{
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	return (0);
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}
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/*
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 * Translate a kernel virtual address to a physical address.
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 */
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int
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_kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa)
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{
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	cpu_kcore_hdr_t *cpu_kh;
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	paddr_t pde_pa, pte_pa;
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	u_long page_off;
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	pd_entry_t pde;
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	pt_entry_t pte;
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	if (ISALIVE(kd)) {
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		_kvm_err(kd, 0, "vatop called in live kernel!");
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		return (0);
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	}
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	page_off = va & (kd->nbpg - 1);
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	if (va >= PMAP_DIRECT_BASE && va <= PMAP_DIRECT_END) {
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		*pa = va - PMAP_DIRECT_BASE;
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		return (int)(kd->nbpg - page_off);
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	}
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	cpu_kh = kd->cpu_data;
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	/*
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	 * Find and read all entries to get to the pa.
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	 */
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	/*
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	 * Level 4.
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	 */
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	pde_pa = cpu_kh->ptdpaddr + (pl4_pi(va) * sizeof(pd_entry_t));
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	if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
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	    _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
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		_kvm_syserr(kd, 0, "could not read PT level 4 entry");
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		goto lose;
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	}
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	if ((pde & PG_V) == 0) {
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		_kvm_err(kd, 0, "invalid translation (invalid level 4 PDE)");
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		goto lose;
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	}
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	/*
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	 * Level 3.
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	 */
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	pde_pa = (pde & PG_FRAME) + (pl3_pi(va) * sizeof(pd_entry_t));
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	if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
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	    _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
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		_kvm_syserr(kd, 0, "could not read PT level 3 entry");
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		goto lose;
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	}
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	if ((pde & PG_V) == 0) {
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		_kvm_err(kd, 0, "invalid translation (invalid level 3 PDE)");
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		goto lose;
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	}
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	/*
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	 * Level 2.
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	 */
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	pde_pa = (pde & PG_FRAME) + (pl2_pi(va) * sizeof(pd_entry_t));
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	if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
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	    _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
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		_kvm_syserr(kd, 0, "could not read PT level 2 entry");
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		goto lose;
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	}
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	if ((pde & PG_V) == 0) {
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		_kvm_err(kd, 0, "invalid translation (invalid level 2 PDE)");
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		goto lose;
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	}
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	/*
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	 * Might be a large page.
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	 */
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	if ((pde & PG_PS) != 0) {
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		page_off = va & (NBPD_L2 - 1);
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		*pa = (pde & PG_LGFRAME) | page_off;
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		return (int)(NBPD_L2 - page_off);
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	}
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	/*
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	 * Level 1.
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	 */
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	pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t));
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	if (pread(kd->pmfd, (void *) &pte, sizeof(pte),
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	    _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
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		_kvm_syserr(kd, 0, "could not read PTE");
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		goto lose;
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	}
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	/*
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	 * Validate the PTE and return the physical address.
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	 */
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	if ((pte & PG_V) == 0) {
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		_kvm_err(kd, 0, "invalid translation (invalid PTE)");
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		goto lose;
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	}
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	*pa = (pte & PG_FRAME) + page_off;
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	return (int)(kd->nbpg - page_off);
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 lose:
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	*pa = (u_long)~0L;
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	return (0);
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}
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/*
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 * Translate a physical address to a file-offset in the crash dump.
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 */
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off_t
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_kvm_pa2off(kvm_t *kd, paddr_t pa)
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{
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	cpu_kcore_hdr_t *cpu_kh;
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	phys_ram_seg_t *ramsegs;
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	off_t off;
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	int i;
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	cpu_kh = kd->cpu_data;
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	ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh));
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	off = 0;
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	for (i = 0; i < cpu_kh->nmemsegs; i++) {
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		if (pa >= ramsegs[i].start &&
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		    (pa - ramsegs[i].start) < ramsegs[i].size) {
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			off += (pa - ramsegs[i].start);
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			break;
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		}
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		off += ramsegs[i].size;
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	}
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	if (i == cpu_kh->nmemsegs)
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		_kvm_err(kd, 0, "pa %lx not in dump", pa);
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	return (kd->dump_off + off);
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}