xref: /src/lib/libkvm/kvm_alpha.c

/* $NetBSD: kvm_alpha.c,v 1.29 2023/08/23 14:00:11 rin 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 (at) 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.
 */

#define	__KVM_ALPHA_PRIVATE		/* see <machine/pte.h> */

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/kcore.h>
#include <sys/types.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>

#include <uvm/uvm_extern.h>

#include <machine/kcore.h>
#include <machine/pmap.h>
#include <machine/vmparam.h>

#include <limits.h>
#include <db.h>
#include <stdlib.h>

#include "kvm_private.h"

__RCSID("$NetBSD: kvm_alpha.c,v 1.29 2023/08/23 14:00:11 rin Exp $");

/*ARGSUSED*/
void
_kvm_freevtop(kvm_t *kd)
{
	return;
}

/*ARGSUSED*/
int
_kvm_initvtop(kvm_t *kd)
{
	return (0);
}

int
_kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
{
	cpu_kcore_hdr_t *cpu_kh;
	alpha_pt_entry_t pte;
	u_long pteoff, page_off;
	int rv;

	if (ISALIVE(kd)) {
		_kvm_err(kd, 0, "vatop called in live kernel!");
		return(0);
	}

	cpu_kh = kd->cpu_data;
	page_off = va & (cpu_kh->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 = cpu_kh->page_size - page_off;
	} else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) {
		/*
		 * Real kernel virtual address: do the translation.
		 */

		/* Find and read the L1 PTE. */
		pteoff = cpu_kh->lev1map_pa +
		    l1pte_index(va) * sizeof(alpha_pt_entry_t);
		if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
		    _kvm_pa2off(kd, pteoff)) != 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) * cpu_kh->page_size +
		    l2pte_index(va) * sizeof(alpha_pt_entry_t);
		if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
		    _kvm_pa2off(kd, pteoff)) != 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) * cpu_kh->page_size +
		    l3pte_index(va) * sizeof(alpha_pt_entry_t);
		if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
		    _kvm_pa2off(kd, pteoff)) != 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) * cpu_kh->page_size + page_off;
		rv = cpu_kh->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(kvm_t *kd, paddr_t pa)
{
	cpu_kcore_hdr_t *cpu_kh;
	phys_ram_seg_t *ramsegs;
	off_t off;
	int i;

	cpu_kh = kd->cpu_data;
	ramsegs = (phys_ram_seg_t *)((char *)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);
}

/*
 * Machine-dependent initialization for ALL open kvm descriptors,
 * not just those for a kernel crash dump.  Some architectures
 * have to deal with these NOT being constants!  (i.e. m68k)
 */
int
_kvm_mdopen(kvm_t *kd)
{

	kd->min_uva = VM_MIN_ADDRESS;
	kd->max_uva = VM_MAXUSER_ADDRESS;

	return (0);
}