2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1989, 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software developed by the Computer Systems
8 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
9 * BG 91-66 and contributed to Berkeley.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38 __SCCSID("@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93");
41 * AMD64 machine dependent routines for kvm. Hopefully, the forthcoming
42 * vm code will one day obsolete this module.
45 #include <sys/param.h>
46 #include <sys/endian.h>
56 #include "kvm_private.h"
57 #include "kvm_amd64.h"
66 * Translate a physical memory address to a file-offset in the crash-dump.
69 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs)
71 struct vmstate *vm = kd->vmst;
77 return (AMD64_PAGE_SIZE - (pa & AMD64_PAGE_MASK));
82 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
86 *ofs = (pa - p->p_paddr) + p->p_offset;
87 return (AMD64_PAGE_SIZE - (pa & AMD64_PAGE_MASK));
91 _amd64_freevtop(kvm_t *kd)
93 struct vmstate *vm = kd->vmst;
103 _amd64_probe(kvm_t *kd)
106 return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_X86_64) &&
107 !_kvm_is_minidump(kd));
111 _amd64_initvtop(kvm_t *kd)
113 struct kvm_nlist nl[2];
118 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
119 if (kd->vmst == NULL) {
120 _kvm_err(kd, kd->program, "cannot allocate vm");
125 if (kd->rawdump == 0) {
126 if (_kvm_read_core_phdrs(kd, &kd->vmst->phnum,
127 &kd->vmst->phdr) == -1)
131 nl[0].n_name = "kernbase";
134 if (kvm_nlist2(kd, nl) != 0) {
135 _kvm_err(kd, kd->program, "bad namelist - no kernbase");
138 kernbase = nl[0].n_value;
140 nl[0].n_name = "KPML4phys";
143 if (kvm_nlist2(kd, nl) != 0) {
144 _kvm_err(kd, kd->program, "bad namelist - no KPML4phys");
147 if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa, sizeof(pa)) !=
149 _kvm_err(kd, kd->program, "cannot read KPML4phys");
153 PML4 = _kvm_malloc(kd, AMD64_PAGE_SIZE);
155 _kvm_err(kd, kd->program, "cannot allocate PML4");
158 if (kvm_read2(kd, pa, PML4, AMD64_PAGE_SIZE) != AMD64_PAGE_SIZE) {
159 _kvm_err(kd, kd->program, "cannot read KPML4phys");
163 kd->vmst->PML4 = PML4;
168 _amd64_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
171 amd64_physaddr_t offset;
172 amd64_physaddr_t pdpe_pa;
173 amd64_physaddr_t pde_pa;
174 amd64_physaddr_t pte_pa;
188 offset = va & AMD64_PAGE_MASK;
191 * If we are initializing (kernel page table descriptor pointer
192 * not yet set) then return pa == va to avoid infinite recursion.
194 if (vm->PML4 == NULL) {
195 s = _kvm_pa2off(kd, va, pa);
197 _kvm_err(kd, kd->program,
198 "_amd64_vatop: bootstrap data not in dump");
201 return (AMD64_PAGE_SIZE - offset);
204 pml4eindex = (va >> AMD64_PML4SHIFT) & (AMD64_NPML4EPG - 1);
205 pml4e = le64toh(vm->PML4[pml4eindex]);
206 if ((pml4e & AMD64_PG_V) == 0) {
207 _kvm_err(kd, kd->program, "_amd64_vatop: pml4e not valid");
211 pdpeindex = (va >> AMD64_PDPSHIFT) & (AMD64_NPDPEPG - 1);
212 pdpe_pa = (pml4e & AMD64_PG_FRAME) + (pdpeindex * sizeof(amd64_pdpe_t));
214 s = _kvm_pa2off(kd, pdpe_pa, &ofs);
215 if (s < sizeof(pdpe)) {
216 _kvm_err(kd, kd->program, "_amd64_vatop: pdpe_pa not found");
219 if (pread(kd->pmfd, &pdpe, sizeof(pdpe), ofs) != sizeof(pdpe)) {
220 _kvm_syserr(kd, kd->program, "_amd64_vatop: read pdpe");
223 pdpe = le64toh(pdpe);
224 if ((pdpe & AMD64_PG_V) == 0) {
225 _kvm_err(kd, kd->program, "_amd64_vatop: pdpe not valid");
229 if (pdpe & AMD64_PG_PS) {
231 * No next-level page table; pdpe describes one 1GB page.
233 a = (pdpe & AMD64_PG_1GB_FRAME) + (va & AMD64_PDPMASK);
234 s = _kvm_pa2off(kd, a, pa);
236 _kvm_err(kd, kd->program,
237 "_amd64_vatop: 1GB page address not in dump");
240 return (AMD64_NBPDP - (va & AMD64_PDPMASK));
243 pdeindex = (va >> AMD64_PDRSHIFT) & (AMD64_NPDEPG - 1);
244 pde_pa = (pdpe & AMD64_PG_FRAME) + (pdeindex * sizeof(amd64_pde_t));
246 s = _kvm_pa2off(kd, pde_pa, &ofs);
247 if (s < sizeof(pde)) {
248 _kvm_syserr(kd, kd->program, "_amd64_vatop: pde_pa not found");
251 if (pread(kd->pmfd, &pde, sizeof(pde), ofs) != sizeof(pde)) {
252 _kvm_syserr(kd, kd->program, "_amd64_vatop: read pde");
256 if ((pde & AMD64_PG_V) == 0) {
257 _kvm_err(kd, kd->program, "_amd64_vatop: pde not valid");
261 if (pde & AMD64_PG_PS) {
263 * No final-level page table; pde describes one 2MB page.
265 a = (pde & AMD64_PG_PS_FRAME) + (va & AMD64_PDRMASK);
266 s = _kvm_pa2off(kd, a, pa);
268 _kvm_err(kd, kd->program,
269 "_amd64_vatop: 2MB page address not in dump");
272 return (AMD64_NBPDR - (va & AMD64_PDRMASK));
275 pteindex = (va >> AMD64_PAGE_SHIFT) & (AMD64_NPTEPG - 1);
276 pte_pa = (pde & AMD64_PG_FRAME) + (pteindex * sizeof(amd64_pte_t));
278 s = _kvm_pa2off(kd, pte_pa, &ofs);
279 if (s < sizeof(pte)) {
280 _kvm_err(kd, kd->program, "_amd64_vatop: pte_pa not found");
283 if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) {
284 _kvm_syserr(kd, kd->program, "_amd64_vatop: read");
287 if ((pte & AMD64_PG_V) == 0) {
288 _kvm_err(kd, kd->program, "_amd64_vatop: pte not valid");
292 a = (pte & AMD64_PG_FRAME) + offset;
293 s = _kvm_pa2off(kd, a, pa);
295 _kvm_err(kd, kd->program, "_amd64_vatop: address not in dump");
298 return (AMD64_PAGE_SIZE - offset);
301 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
306 _amd64_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
310 _kvm_err(kd, 0, "kvm_kvatop called in live kernel!");
313 return (_amd64_vatop(kd, va, pa));
317 _amd64_native(kvm_t *kd __unused)
327 static struct kvm_arch kvm_amd64 = {
328 .ka_probe = _amd64_probe,
329 .ka_initvtop = _amd64_initvtop,
330 .ka_freevtop = _amd64_freevtop,
331 .ka_kvatop = _amd64_kvatop,
332 .ka_native = _amd64_native,