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/* $OpenBSD: kvm_amd64.c,v 1.2 2004/05/05 16:45:55 marc Exp $ */
/* $NetBSD: kvm_x86_64.c,v 1.3 2002/06/05 22:01:55 fvdl Exp $ */
/*-
* Copyright (c) 1989, 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.
*/
#include <sys/cdefs.h>
/*
* x86-64 machine dependent routines for kvm.
*/
#include <sys/param.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/kcore.h>
#include <machine/kcore.h>
#include <stdlib.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>
#include <uvm/uvm_extern.h>
#include <limits.h>
#include <db.h>
#include "kvm_private.h"
#include <machine/pmap.h>
#include <machine/pte.h>
#include <machine/vmparam.h>
void
_kvm_freevtop(kd)
kvm_t *kd;
{
/* Not actually used for anything right now, but safe. */
if (kd->vmst != 0)
free(kd->vmst);
}
/*ARGSUSED*/
int
_kvm_initvtop(kd)
kvm_t *kd;
{
return (0);
}
/*
* Translate a kernel virtual address to a physical address.
*/
int
_kvm_kvatop(kd, va, pa)
kvm_t *kd;
u_long va;
u_long *pa;
{
cpu_kcore_hdr_t *cpu_kh;
u_long page_off;
pd_entry_t pde;
pt_entry_t pte;
paddr_t pde_pa, pte_pa;
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return (0);
}
cpu_kh = kd->cpu_data;
page_off = va & PGOFSET;
/*
* Find and read all entries to get to the pa.
*/
/*
* Level 4.
*/
pde_pa = cpu_kh->ptdpaddr + (pl4_pi(va) * sizeof(pd_entry_t));
if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
_kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
_kvm_syserr(kd, 0, "could not read PT level 4 entry");
goto lose;
}
if ((pde & PG_V) == 0) {
_kvm_err(kd, 0, "invalid translation (invalid level 4 PDE)");
goto lose;
}
/*
* Level 3.
*/
pde_pa = (pde & PG_FRAME) + (pl3_pi(va) * sizeof(pd_entry_t));
if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
_kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
_kvm_syserr(kd, 0, "could not read PT level 3 entry");
goto lose;
}
if ((pde & PG_V) == 0) {
_kvm_err(kd, 0, "invalid translation (invalid level 3 PDE)");
goto lose;
}
/*
* Level 2.
*/
pde_pa = (pde & PG_FRAME) + (pl2_pi(va) * sizeof(pd_entry_t));
if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
_kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
_kvm_syserr(kd, 0, "could not read PT level 2 entry");
goto lose;
}
if ((pde & PG_V) == 0) {
_kvm_err(kd, 0, "invalid translation (invalid level 2 PDE)");
goto lose;
}
/*
* Level 1.
*/
pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t));
if (pread(kd->pmfd, (void *) &pte, sizeof(pte),
_kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
_kvm_syserr(kd, 0, "could not read PTE");
goto lose;
}
/*
* Validate the PTE and return the physical address.
*/
if ((pte & PG_V) == 0) {
_kvm_err(kd, 0, "invalid translation (invalid PTE)");
goto lose;
}
*pa = (pte & PG_FRAME) + page_off;
return (int)(NBPG - page_off);
lose:
*pa = (u_long)~0L;
return (0);
}
/*
* Translate a physical address to a file-offset in the crash dump.
*/
off_t
_kvm_pa2off(kd, pa)
kvm_t *kd;
u_long pa;
{
cpu_kcore_hdr_t *cpu_kh;
phys_ram_seg_t *ramsegs;
off_t off;
int i;
cpu_kh = kd->cpu_data;
ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh));
off = 0;
for (i = 0; i < cpu_kh->nmemsegs; i++) {
if (pa >= ramsegs[i].start &&
(pa - ramsegs[i].start) < ramsegs[i].size) {
off += (pa - ramsegs[i].start);
break;
}
off += ramsegs[i].size;
}
return (kd->dump_off + off);
}
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