kvm_amd64.c revision 82263
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 82263 2001-08-24 08:53:30Z 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> 5376176Smarkm#include <sys/lock.h> 5476176Smarkm#include <sys/mutex.h> 551602Srgrimes#include <sys/user.h> 561602Srgrimes#include <sys/proc.h> 571602Srgrimes#include <sys/stat.h> 5817141Sjkh#include <stdlib.h> 591602Srgrimes#include <unistd.h> 601602Srgrimes#include <nlist.h> 611602Srgrimes#include <kvm.h> 621602Srgrimes 631602Srgrimes#include <vm/vm.h> 641602Srgrimes#include <vm/vm_param.h> 651602Srgrimes 661602Srgrimes#include <limits.h> 671602Srgrimes 681602Srgrimes#include "kvm_private.h" 691602Srgrimes 701602Srgrimes#ifndef btop 711603Srgrimes#define btop(x) (i386_btop(x)) 721603Srgrimes#define ptob(x) (i386_ptob(x)) 731602Srgrimes#endif 741602Srgrimes 751602Srgrimesstruct vmstate { 7618798Speter pd_entry_t *PTD; 771602Srgrimes}; 781602Srgrimes 791602Srgrimesvoid 8018798Speter_kvm_freevtop(kvm_t *kd) 8118798Speter{ 821603Srgrimes if (kd->vmst != 0) { 8318798Speter if (kd->vmst->PTD) { 8418798Speter free(kd->vmst->PTD); 8518798Speter } 861602Srgrimes free(kd->vmst); 871603Srgrimes } 881602Srgrimes} 891602Srgrimes 901602Srgrimesint 9118798Speter_kvm_initvtop(kvm_t *kd) 9218798Speter{ 931602Srgrimes struct vmstate *vm; 941603Srgrimes struct nlist nlist[2]; 9518798Speter u_long pa; 9682263Speter u_long kernbase; 9718798Speter pd_entry_t *PTD; 981602Srgrimes 991602Srgrimes vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); 1001603Srgrimes if (vm == 0) { 1011603Srgrimes _kvm_err(kd, kd->program, "cannot allocate vm"); 1021602Srgrimes return (-1); 1031603Srgrimes } 1041602Srgrimes kd->vmst = vm; 10518798Speter vm->PTD = 0; 1061602Srgrimes 10782263Speter nlist[0].n_name = "kernbase"; 1081603Srgrimes nlist[1].n_name = 0; 1091602Srgrimes 11082263Speter if (kvm_nlist(kd, nlist) != 0) 11182263Speter kernbase = KERNBASE; /* for old kernels */ 11282263Speter else 11382263Speter kernbase = nlist[0].n_value; 11482263Speter 11582263Speter nlist[0].n_name = "IdlePTD"; 11682263Speter nlist[1].n_name = 0; 11782263Speter 1181602Srgrimes if (kvm_nlist(kd, nlist) != 0) { 1191602Srgrimes _kvm_err(kd, kd->program, "bad namelist"); 1201602Srgrimes return (-1); 1211602Srgrimes } 12282263Speter if (kvm_read(kd, (nlist[0].n_value - kernbase), &pa, sizeof(pa)) != 12382263Speter sizeof(pa)) { 1241603Srgrimes _kvm_err(kd, kd->program, "cannot read IdlePTD"); 1251602Srgrimes return (-1); 1261602Srgrimes } 12718798Speter PTD = _kvm_malloc(kd, PAGE_SIZE); 12818798Speter if (kvm_read(kd, pa, PTD, PAGE_SIZE) != PAGE_SIZE) { 1291603Srgrimes _kvm_err(kd, kd->program, "cannot read PTD"); 1301602Srgrimes return (-1); 1311602Srgrimes } 13218798Speter vm->PTD = PTD; 1331602Srgrimes return (0); 1341602Srgrimes} 1351602Srgrimes 1361602Srgrimesstatic int 13718798Speter_kvm_vatop(kvm_t *kd, u_long va, u_long *pa) 13818798Speter{ 13918798Speter struct vmstate *vm; 14018798Speter u_long offset; 14118798Speter u_long pte_pa; 14218798Speter pd_entry_t pde; 14318798Speter pt_entry_t pte; 14418798Speter u_long pdeindex; 14518798Speter u_long pteindex; 14618798Speter int i; 1471602Srgrimes 1481602Srgrimes if (ISALIVE(kd)) { 1491602Srgrimes _kvm_err(kd, 0, "vatop called in live kernel!"); 1501602Srgrimes return((off_t)0); 1511602Srgrimes } 15218798Speter 15318798Speter vm = kd->vmst; 15418798Speter offset = va & (PAGE_SIZE - 1); 15518798Speter 15618798Speter /* 15718798Speter * If we are initializing (kernel page table descriptor pointer 15818798Speter * not yet set) then return pa == va to avoid infinite recursion. 15918798Speter */ 16018798Speter if (vm->PTD == 0) { 16118798Speter *pa = va; 16218798Speter return (PAGE_SIZE - offset); 16318798Speter } 16418798Speter 16518798Speter pdeindex = va >> PDRSHIFT; 16618798Speter pde = vm->PTD[pdeindex]; 16718798Speter if (((u_long)pde & PG_V) == 0) 16818798Speter goto invalid; 16918798Speter 17028318Stegge if ((u_long)pde & PG_PS) { 17128318Stegge /* 17228318Stegge * No second-level page table; ptd describes one 4MB page. 17328318Stegge * (We assume that the kernel wouldn't set PG_PS without enabling 17428318Stegge * it cr0, and that the kernel doesn't support 36-bit physical 17528318Stegge * addresses). 17628318Stegge */ 17728318Stegge#define PAGE4M_MASK (NBPDR - 1) 17828318Stegge#define PG_FRAME4M (~PAGE4M_MASK) 17928318Stegge *pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK); 18028318Stegge return (NBPDR - (va & PAGE4M_MASK)); 18128318Stegge } 18228318Stegge 18318798Speter pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1); 18418798Speter pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pt_entry_t)); 18518798Speter 18618798Speter /* XXX This has to be a physical address read, kvm_read is virtual */ 18718798Speter if (lseek(kd->pmfd, pte_pa, 0) == -1) { 18818798Speter _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek"); 18918798Speter goto invalid; 19018798Speter } 19118798Speter if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) { 19218798Speter _kvm_syserr(kd, kd->program, "_kvm_vatop: read"); 19318798Speter goto invalid; 19418798Speter } 19518798Speter if (((u_long)pte & PG_V) == 0) 19618798Speter goto invalid; 19718798Speter 19818798Speter *pa = ((u_long)pte & PG_FRAME) + offset; 19918798Speter return (PAGE_SIZE - offset); 20018798Speter 20118798Speterinvalid: 2021602Srgrimes _kvm_err(kd, 0, "invalid address (%x)", va); 20318798Speter return (0); 2041602Srgrimes} 2051602Srgrimes 2061602Srgrimesint 20718798Speter_kvm_kvatop(kvm_t *kd, u_long va, u_long *pa) 20818798Speter{ 2091603Srgrimes return (_kvm_vatop(kd, va, pa)); 2101602Srgrimes} 211