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/* $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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.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 lev1map_pa; /* PA of Lev1map */
u_int64_t page_size; /* Page size */
u_int64_t nmemsegs; /* Number of RAM segm */
};
void
_kvm_freevtop(kd)
kvm_t *kd;
{
/* Not actually used for anything right now, but safe. */
if (kd->vmst != 0)
free(kd->vmst);
}
int
_kvm_initvtop(kd)
kvm_t *kd;
{
struct vmstate *vm;
struct nlist nlist[2];
u_long pa;
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 = ALPHA_PGBYTES;
nlist[0].n_name = "_Lev1map";
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), &pa, sizeof(pa)) != sizeof(pa)) {
_kvm_err(kd, kd->program, "cannot read Lev1map");
return (-1);
}
} else
if (kvm_read(kd, (nlist[0].n_value), &pa, sizeof(pa)) != sizeof(pa)) {
_kvm_err(kd, kd->program, "cannot read Lev1map");
return (-1);
}
vm->lev1map_pa = pa;
return (0);
}
int
_kvm_kvatop(kd, va, pa)
kvm_t *kd;
u_long va;
off_t *pa;
{
u_int64_t lev1map_pa; /* PA of Lev1map */
u_int64_t page_size;
int rv, page_off;
alpha_pt_entry_t pte;
off_t pteoff;
struct vmstate *vm;
vm = kd->vmst ;
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return(0);
}
lev1map_pa = vm->lev1map_pa;
page_size = vm->page_size;
page_off = va & (page_size - 1);
if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) {
/*
* Direct-mapped address: just convert it.
*/
*pa = ALPHA_K0SEG_TO_PHYS(va);
rv = page_size - page_off;
} else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) {
/*
* Real kernel virtual address: do the translation.
*/
#define PTMASK ((1 << ALPHA_PTSHIFT) - 1)
#define pmap_lev1_index(va) (((va) >> ALPHA_L1SHIFT) & PTMASK)
#define pmap_lev2_index(va) (((va) >> ALPHA_L2SHIFT) & PTMASK)
#define pmap_lev3_index(va) (((va) >> ALPHA_L3SHIFT) & PTMASK)
/* Find and read the L1 PTE. */
pteoff = lev1map_pa +
pmap_lev1_index(va) * sizeof(alpha_pt_entry_t);
if (lseek(kd->pmfd, _kvm_pa2off(kd, pteoff), 0) == -1 ||
read(kd->pmfd, (char *)&pte, sizeof(pte)) != sizeof(pte)) {
_kvm_syserr(kd, 0, "could not read L1 PTE");
goto lose;
}
/* Find and read the L2 PTE. */
if ((pte & ALPHA_PTE_VALID) == 0) {
_kvm_err(kd, 0, "invalid translation (invalid L1 PTE)");
goto lose;
}
pteoff = ALPHA_PTE_TO_PFN(pte) * page_size +
pmap_lev2_index(va) * sizeof(alpha_pt_entry_t);
if (lseek(kd->pmfd, _kvm_pa2off(kd, pteoff), 0) == -1 ||
read(kd->pmfd, (char *)&pte, sizeof(pte)) != sizeof(pte)) {
_kvm_syserr(kd, 0, "could not read L2 PTE");
goto lose;
}
/* Find and read the L3 PTE. */
if ((pte & ALPHA_PTE_VALID) == 0) {
_kvm_err(kd, 0, "invalid translation (invalid L2 PTE)");
goto lose;
}
pteoff = ALPHA_PTE_TO_PFN(pte) * page_size +
pmap_lev3_index(va) * sizeof(alpha_pt_entry_t);
if (lseek(kd->pmfd, _kvm_pa2off(kd, pteoff), 0) == -1 ||
read(kd->pmfd, (char *)&pte, sizeof(pte)) != sizeof(pte)) {
_kvm_syserr(kd, 0, "could not read L3 PTE");
goto lose;
}
/* Fill in the PA. */
if ((pte & ALPHA_PTE_VALID) == 0) {
_kvm_err(kd, 0, "invalid translation (invalid L3 PTE)");
goto lose;
}
*pa = ALPHA_PTE_TO_PFN(pte) * page_size + page_off;
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 ALPHA_K0SEG_TO_PHYS(pa);
}
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