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/* $FreeBSD$ */
/* $NetBSD: kvm_alpha.c,v 1.7.2.1 1997/11/02 20:34:26 mellon Exp $ */
/*
* Copyright (c) 1994, 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <limits.h>
#include <stdlib.h>
#include <machine/pmap.h>
#include "kvm_private.h"
static off_t _kvm_pa2off(kvm_t *kd, u_long pa);
struct vmstate {
u_int64_t kptdir; /* PA of page table directory */
u_int64_t page_size; /* Page size */
};
void
_kvm_freevtop(kvm_t *kd)
{
/* Not actually used for anything right now, but safe. */
if (kd->vmst != 0)
free(kd->vmst);
}
int
_kvm_initvtop(kvm_t *kd)
{
struct vmstate *vm;
struct nlist nlist[2];
u_int64_t va;
vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
if (vm == 0) {
_kvm_err(kd, kd->program, "cannot allocate vm");
return (-1);
}
kd->vmst = vm;
vm->page_size = getpagesize(); /* XXX wrong for crashdumps */
nlist[0].n_name = "kptdir";
nlist[1].n_name = 0;
if (kvm_nlist(kd, nlist) != 0) {
_kvm_err(kd, kd->program, "bad namelist");
return (-1);
}
if(!ISALIVE(kd)) {
if (kvm_read(kd, (nlist[0].n_value), &va, sizeof(va)) != sizeof(va)) {
_kvm_err(kd, kd->program, "cannot read kptdir");
return (-1);
}
} else
if (kvm_read(kd, (nlist[0].n_value), &va, sizeof(va)) != sizeof(va)) {
_kvm_err(kd, kd->program, "cannot read kptdir");
return (-1);
}
vm->kptdir = IA64_RR_MASK(va);
return (0);
}
int
_kvm_kvatop(kvm_t *kd, u_long va, u_long *pa)
{
u_int64_t kptdir; /* PA of kptdir */
u_int64_t page_size;
int rv, page_off;
struct ia64_lpte pte;
off_t pteoff;
struct vmstate *vm;
vm = kd->vmst;
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return(0);
}
kptdir = vm->kptdir;
page_size = vm->page_size;
page_off = va & (page_size - 1);
if (va >= IA64_RR_BASE(6) && va <= IA64_RR_BASE(7) + ((1L<<61)-1)) {
/*
* Direct-mapped address: just convert it.
*/
*pa = IA64_RR_MASK(va);
rv = page_size - page_off;
} else if (va >= IA64_RR_BASE(5) && va < IA64_RR_BASE(6)) {
/*
* Real kernel virtual address: do the translation.
*/
#define KPTE_DIR_INDEX(va, ps) \
(IA64_RR_MASK(va) / ((ps) * (ps) * sizeof(struct ia64_lpte)))
#define KPTE_PTE_INDEX(va, ps) \
(((va) / (ps)) % (ps / sizeof(struct ia64_lpte)))
int maxpt = page_size / sizeof(u_int64_t);
int ptno = KPTE_DIR_INDEX(va, page_size);
int pgno = KPTE_PTE_INDEX(va, page_size);
u_int64_t ptoff, pgoff;
if (ptno >= maxpt) {
_kvm_err(kd, 0, "invalid translation (va too large)");
goto lose;
}
ptoff = kptdir + ptno * sizeof(u_int64_t);
if (lseek(kd->pmfd, _kvm_pa2off(kd, ptoff), 0) == -1 ||
read(kd->pmfd, &pgoff, sizeof(pgoff)) != sizeof(pgoff)) {
_kvm_syserr(kd, 0, "could not read page table address");
goto lose;
}
pgoff = IA64_RR_MASK(pgoff);
if (!pgoff) {
_kvm_err(kd, 0, "invalid translation (no page table)");
goto lose;
}
if (lseek(kd->pmfd, _kvm_pa2off(kd, pgoff), 0) == -1 ||
read(kd->pmfd, &pte, sizeof(pte)) != sizeof(pte)) {
_kvm_syserr(kd, 0, "could not read PTE");
goto lose;
}
if (!pte.pte_p) {
_kvm_err(kd, 0, "invalid translation (invalid PTE)");
goto lose;
}
*pa = pte.pte_ppn << 12;
rv = page_size - page_off;
} else {
/*
* Bogus address (not in KV space): punt.
*/
_kvm_err(kd, 0, "invalid kernel virtual address");
lose:
*pa = -1;
rv = 0;
}
return (rv);
}
/*
* 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 IA64_PHYS_TO_RR7(pa);
}
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