236 lines
5.9 KiB
C
236 lines
5.9 KiB
C
/* $NetBSD: kvm_i386.c,v 1.32 2022/01/10 19:51:30 christos 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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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: kvm_i386.c,v 1.32 2022/01/10 19:51:30 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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/*
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* i386 machine dependent routines for kvm.
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/kcore.h>
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#include <sys/types.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 <i386/kcore.h>
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#include <i386/pmap.h>
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#include <i386/pte.h>
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#include <i386/vmparam.h>
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#ifndef btop
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#define btop(x) (((unsigned)(x)) >> PGSHIFT) /* XXX */
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#define ptob(x) ((caddr_t)((x) << PGSHIFT)) /* XXX */
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#endif
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/*
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* Indicates whether PAE is in use for the kernel image
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* 0: native i386 memory mappings
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* 1: i386 PAE mappings
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*/
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static int i386_use_pae;
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int _kvm_kvatop_i386(kvm_t *, vaddr_t, paddr_t *);
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int _kvm_kvatop_i386pae(kvm_t *, vaddr_t, paddr_t *);
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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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if (kd->vmst != 0)
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free(kd->vmst);
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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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cpu_kcore_hdr_t *cpu_kh = kd->cpu_data;
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i386_use_pae = 0; /* default: non PAE mode */
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if ((cpu_kh->pdppaddr & I386_KCORE_PAE) == I386_KCORE_PAE)
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i386_use_pae = 1;
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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, vaddr_t va, paddr_t *pa)
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{
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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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switch (i386_use_pae) {
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default:
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case 0:
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return _kvm_kvatop_i386(kd, va, pa);
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case 1:
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return _kvm_kvatop_i386pae(kd, va, pa);
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}
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}
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/*
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* Used to translate a virtual address to a physical address for systems
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* with PAE mode disabled. Only two levels of virtual memory pages are
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* dereferenced (L2 PDEs, then L1 PTEs).
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*/
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int
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_kvm_kvatop_i386(kvm_t *kd, vaddr_t va, paddr_t *pa)
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{
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cpu_kcore_hdr_t *cpu_kh;
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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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paddr_t pde_pa, pte_pa;
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cpu_kh = kd->cpu_data;
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page_off = va & PGOFSET;
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/*
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* Find and read the page directory entry.
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* pdppaddr being PAGE_SIZE aligned, we mask the option bits.
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*/
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pde_pa = (cpu_kh->pdppaddr & PTE_FRAME) + (pl2_pi(va) * sizeof(pde));
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if (_kvm_pread(kd, 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 PDE");
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goto lose;
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}
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/*
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* Find and read the page table entry.
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*/
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if ((pde & PTE_P) == 0) {
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_kvm_err(kd, 0, "invalid translation (invalid PDE)");
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goto lose;
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}
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if ((pde & PTE_PS) != 0) {
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/*
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* This is a 4MB page.
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*/
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page_off = va & ~PTE_LGFRAME;
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*pa = (pde & PTE_LGFRAME) + page_off;
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return (int)(NBPD_L2 - page_off);
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}
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pte_pa = (pde & PTE_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t));
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if (_kvm_pread(kd, 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 & PTE_P) == 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 & PTE_FRAME) + page_off;
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return (int)(NBPG - page_off);
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lose:
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*pa = (paddr_t)~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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return (kd->dump_off + off);
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}
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/*
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* Machine-dependent initialization for ALL open kvm descriptors,
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* not just those for a kernel crash dump. Some architectures
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* have to deal with these NOT being constants! (i.e. m68k)
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*/
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int
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_kvm_mdopen(kvm_t *kd)
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{
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kd->min_uva = VM_MIN_ADDRESS;
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kd->max_uva = VM_MAXUSER_ADDRESS;
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return 0;
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}
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