kvm_amd64.c revision 55127
11602Srgrimes/*- 21602Srgrimes * Copyright (c) 1989, 1992, 1993 31602Srgrimes * The Regents of the University of California. All rights reserved. 41602Srgrimes * 51602Srgrimes * This code is derived from software developed by the Computer Systems 61602Srgrimes * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 71602Srgrimes * BG 91-66 and contributed to Berkeley. 81602Srgrimes * 91602Srgrimes * Redistribution and use in source and binary forms, with or without 101602Srgrimes * modification, are permitted provided that the following conditions 111602Srgrimes * are met: 121602Srgrimes * 1. Redistributions of source code must retain the above copyright 131602Srgrimes * notice, this list of conditions and the following disclaimer. 141602Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 151602Srgrimes * notice, this list of conditions and the following disclaimer in the 161602Srgrimes * documentation and/or other materials provided with the distribution. 171602Srgrimes * 3. All advertising materials mentioning features or use of this software 181602Srgrimes * must display the following acknowledgement: 191602Srgrimes * This product includes software developed by the University of 201602Srgrimes * California, Berkeley and its contributors. 211602Srgrimes * 4. Neither the name of the University nor the names of its contributors 221602Srgrimes * may be used to endorse or promote products derived from this software 231602Srgrimes * without specific prior written permission. 241602Srgrimes * 251602Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 261602Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 271602Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 281602Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 291602Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 301602Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 311602Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 321602Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 331602Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 341602Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 351602Srgrimes * SUCH DAMAGE. 361602Srgrimes */ 371602Srgrimes 381602Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 3955127Speter#if 0 401602Srgrimesstatic char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93"; 4155127Speter#else 4255127Speterstatic const char rcsid[] = 4355127Speter "$FreeBSD: head/lib/libkvm/kvm_amd64.c 55127 1999-12-27 07:14:58Z peter $"; 4455127Speter#endif 451602Srgrimes#endif /* LIBC_SCCS and not lint */ 461602Srgrimes 471602Srgrimes/* 488870Srgrimes * i386 machine dependent routines for kvm. Hopefully, the forthcoming 491602Srgrimes * vm code will one day obsolete this module. 501602Srgrimes */ 511602Srgrimes 521602Srgrimes#include <sys/param.h> 531602Srgrimes#include <sys/user.h> 541602Srgrimes#include <sys/proc.h> 551602Srgrimes#include <sys/stat.h> 5617141Sjkh#include <stdlib.h> 571602Srgrimes#include <unistd.h> 581602Srgrimes#include <nlist.h> 591602Srgrimes#include <kvm.h> 601602Srgrimes 611602Srgrimes#include <vm/vm.h> 621602Srgrimes#include <vm/vm_param.h> 631602Srgrimes 641602Srgrimes#include <limits.h> 651602Srgrimes 661602Srgrimes#include "kvm_private.h" 671602Srgrimes 681602Srgrimes#ifndef btop 691603Srgrimes#define btop(x) (i386_btop(x)) 701603Srgrimes#define ptob(x) (i386_ptob(x)) 711602Srgrimes#endif 721602Srgrimes 731602Srgrimesstruct vmstate { 7418798Speter pd_entry_t *PTD; 751602Srgrimes}; 761602Srgrimes 771602Srgrimesvoid 7818798Speter_kvm_freevtop(kvm_t *kd) 7918798Speter{ 801603Srgrimes if (kd->vmst != 0) { 8118798Speter if (kd->vmst->PTD) { 8218798Speter free(kd->vmst->PTD); 8318798Speter } 841602Srgrimes free(kd->vmst); 851603Srgrimes } 861602Srgrimes} 871602Srgrimes 881602Srgrimesint 8918798Speter_kvm_initvtop(kvm_t *kd) 9018798Speter{ 911602Srgrimes struct vmstate *vm; 921603Srgrimes struct nlist nlist[2]; 9318798Speter u_long pa; 9418798Speter pd_entry_t *PTD; 951602Srgrimes 961602Srgrimes vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); 971603Srgrimes if (vm == 0) { 981603Srgrimes _kvm_err(kd, kd->program, "cannot allocate vm"); 991602Srgrimes return (-1); 1001603Srgrimes } 1011602Srgrimes kd->vmst = vm; 10218798Speter vm->PTD = 0; 1031602Srgrimes 1041603Srgrimes nlist[0].n_name = "_IdlePTD"; 1051603Srgrimes nlist[1].n_name = 0; 1061602Srgrimes 1071602Srgrimes if (kvm_nlist(kd, nlist) != 0) { 1081602Srgrimes _kvm_err(kd, kd->program, "bad namelist"); 1091602Srgrimes return (-1); 1101602Srgrimes } 11118798Speter if (kvm_read(kd, (nlist[0].n_value - KERNBASE), &pa, sizeof(pa)) != sizeof(pa)) { 1121603Srgrimes _kvm_err(kd, kd->program, "cannot read IdlePTD"); 1131602Srgrimes return (-1); 1141602Srgrimes } 11518798Speter PTD = _kvm_malloc(kd, PAGE_SIZE); 11618798Speter if (kvm_read(kd, pa, PTD, PAGE_SIZE) != PAGE_SIZE) { 1171603Srgrimes _kvm_err(kd, kd->program, "cannot read PTD"); 1181602Srgrimes return (-1); 1191602Srgrimes } 12018798Speter vm->PTD = PTD; 1211602Srgrimes return (0); 1221602Srgrimes} 1231602Srgrimes 1241602Srgrimesstatic int 12518798Speter_kvm_vatop(kvm_t *kd, u_long va, u_long *pa) 12618798Speter{ 12718798Speter struct vmstate *vm; 12818798Speter u_long offset; 12918798Speter u_long pte_pa; 13018798Speter pd_entry_t pde; 13118798Speter pt_entry_t pte; 13218798Speter u_long pdeindex; 13318798Speter u_long pteindex; 13418798Speter int i; 1351602Srgrimes 1361602Srgrimes if (ISALIVE(kd)) { 1371602Srgrimes _kvm_err(kd, 0, "vatop called in live kernel!"); 1381602Srgrimes return((off_t)0); 1391602Srgrimes } 14018798Speter 14118798Speter vm = kd->vmst; 14218798Speter offset = va & (PAGE_SIZE - 1); 14318798Speter 14418798Speter /* 14518798Speter * If we are initializing (kernel page table descriptor pointer 14618798Speter * not yet set) then return pa == va to avoid infinite recursion. 14718798Speter */ 14818798Speter if (vm->PTD == 0) { 14918798Speter *pa = va; 15018798Speter return (PAGE_SIZE - offset); 15118798Speter } 15218798Speter 15318798Speter pdeindex = va >> PDRSHIFT; 15418798Speter pde = vm->PTD[pdeindex]; 15518798Speter if (((u_long)pde & PG_V) == 0) 15618798Speter goto invalid; 15718798Speter 15828318Stegge if ((u_long)pde & PG_PS) { 15928318Stegge /* 16028318Stegge * No second-level page table; ptd describes one 4MB page. 16128318Stegge * (We assume that the kernel wouldn't set PG_PS without enabling 16228318Stegge * it cr0, and that the kernel doesn't support 36-bit physical 16328318Stegge * addresses). 16428318Stegge */ 16528318Stegge#define PAGE4M_MASK (NBPDR - 1) 16628318Stegge#define PG_FRAME4M (~PAGE4M_MASK) 16728318Stegge *pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK); 16828318Stegge return (NBPDR - (va & PAGE4M_MASK)); 16928318Stegge } 17028318Stegge 17118798Speter pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1); 17218798Speter pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pt_entry_t)); 17318798Speter 17418798Speter /* XXX This has to be a physical address read, kvm_read is virtual */ 17518798Speter if (lseek(kd->pmfd, pte_pa, 0) == -1) { 17618798Speter _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek"); 17718798Speter goto invalid; 17818798Speter } 17918798Speter if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) { 18018798Speter _kvm_syserr(kd, kd->program, "_kvm_vatop: read"); 18118798Speter goto invalid; 18218798Speter } 18318798Speter if (((u_long)pte & PG_V) == 0) 18418798Speter goto invalid; 18518798Speter 18618798Speter *pa = ((u_long)pte & PG_FRAME) + offset; 18718798Speter return (PAGE_SIZE - offset); 18818798Speter 18918798Speterinvalid: 1901602Srgrimes _kvm_err(kd, 0, "invalid address (%x)", va); 19118798Speter return (0); 1921602Srgrimes} 1931602Srgrimes 1941602Srgrimesint 19518798Speter_kvm_kvatop(kvm_t *kd, u_long va, u_long *pa) 19618798Speter{ 1971603Srgrimes return (_kvm_vatop(kd, va, pa)); 1981602Srgrimes} 199