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.
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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
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25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #if defined(LIBC_SCCS) && !defined(lint)
41 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93";
43 #endif /* LIBC_SCCS and not lint */
46 * i386 machine dependent routines for kvm. Hopefully, the forthcoming
47 * vm code will one day obsolete this module.
50 #include <sys/param.h>
51 #include <sys/endian.h>
60 #include <machine/vmparam.h> /* For KERNBASE. */
65 #include "kvm_private.h"
76 * Translate a physical memory address to a file-offset in the crash-dump.
79 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs)
81 struct vmstate *vm = kd->vmst;
87 return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK));
92 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
96 *ofs = (pa - p->p_paddr) + p->p_offset;
97 return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK));
101 _i386_freevtop(kvm_t *kd)
103 struct vmstate *vm = kd->vmst;
113 _i386_probe(kvm_t *kd)
116 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) &&
117 !_kvm_is_minidump(kd));
121 _i386_initvtop(kvm_t *kd)
123 struct kvm_nlist nl[2];
129 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(struct vmstate));
130 if (kd->vmst == NULL) {
131 _kvm_err(kd, kd->program, "cannot allocate vm");
136 if (kd->rawdump == 0) {
137 if (_kvm_read_core_phdrs(kd, &kd->vmst->phnum,
138 &kd->vmst->phdr) == -1)
142 nl[0].n_name = "kernbase";
145 if (kvm_nlist2(kd, nl) != 0) {
147 kernbase = KERNBASE; /* for old kernels */
149 _kvm_err(kd, kd->program, "cannot resolve kernbase");
153 kernbase = nl[0].n_value;
155 nl[0].n_name = "IdlePDPT";
158 if (kvm_nlist2(kd, nl) == 0) {
159 i386_physaddr_pae_t pa64;
161 if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa,
162 sizeof(pa)) != sizeof(pa)) {
163 _kvm_err(kd, kd->program, "cannot read IdlePDPT");
167 PTD = _kvm_malloc(kd, 4 * I386_PAGE_SIZE);
169 _kvm_err(kd, kd->program, "cannot allocate PTD");
172 for (i = 0; i < 4; i++) {
173 if (kvm_read2(kd, pa + (i * sizeof(pa64)), &pa64,
174 sizeof(pa64)) != sizeof(pa64)) {
175 _kvm_err(kd, kd->program, "Cannot read PDPT");
179 pa64 = le64toh(pa64);
180 if (kvm_read2(kd, pa64 & I386_PG_FRAME_PAE,
181 PTD + (i * I386_PAGE_SIZE), I386_PAGE_SIZE) !=
183 _kvm_err(kd, kd->program, "cannot read PDPT");
191 nl[0].n_name = "IdlePTD";
194 if (kvm_nlist2(kd, nl) != 0) {
195 _kvm_err(kd, kd->program, "bad namelist");
198 if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa,
199 sizeof(pa)) != sizeof(pa)) {
200 _kvm_err(kd, kd->program, "cannot read IdlePTD");
204 PTD = _kvm_malloc(kd, I386_PAGE_SIZE);
206 _kvm_err(kd, kd->program, "cannot allocate PTD");
209 if (kvm_read2(kd, pa, PTD, I386_PAGE_SIZE) != I386_PAGE_SIZE) {
210 _kvm_err(kd, kd->program, "cannot read PTD");
220 _i386_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
223 i386_physaddr_t offset;
224 i386_physaddr_t pte_pa;
235 PTD = (i386_pde_t *)vm->PTD;
236 offset = va & I386_PAGE_MASK;
239 * If we are initializing (kernel page table descriptor pointer
240 * not yet set) then return pa == va to avoid infinite recursion.
243 s = _kvm_pa2off(kd, va, pa);
245 _kvm_err(kd, kd->program,
246 "_i386_vatop: bootstrap data not in dump");
249 return (I386_PAGE_SIZE - offset);
252 pdeindex = va >> I386_PDRSHIFT;
253 pde = le32toh(PTD[pdeindex]);
254 if ((pde & I386_PG_V) == 0) {
255 _kvm_err(kd, kd->program, "_i386_vatop: pde not valid");
259 if (pde & I386_PG_PS) {
261 * No second-level page table; ptd describes one 4MB
262 * page. (We assume that the kernel wouldn't set
263 * PG_PS without enabling it cr0).
265 offset = va & I386_PAGE_PS_MASK;
266 a = (pde & I386_PG_PS_FRAME) + offset;
267 s = _kvm_pa2off(kd, a, pa);
269 _kvm_err(kd, kd->program,
270 "_i386_vatop: 4MB page address not in dump");
273 return (I386_NBPDR - offset);
276 pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG - 1);
277 pte_pa = (pde & I386_PG_FRAME) + (pteindex * sizeof(pte));
279 s = _kvm_pa2off(kd, pte_pa, &ofs);
280 if (s < sizeof(pte)) {
281 _kvm_err(kd, kd->program, "_i386_vatop: pte_pa not found");
285 /* XXX This has to be a physical address read, kvm_read is virtual */
286 if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) {
287 _kvm_syserr(kd, kd->program, "_i386_vatop: pread");
291 if ((pte & I386_PG_V) == 0) {
292 _kvm_err(kd, kd->program, "_kvm_kvatop: pte not valid");
296 a = (pte & I386_PG_FRAME) + offset;
297 s = _kvm_pa2off(kd, a, pa);
299 _kvm_err(kd, kd->program, "_i386_vatop: address not in dump");
302 return (I386_PAGE_SIZE - offset);
305 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
310 _i386_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa)
313 i386_physaddr_pae_t offset;
314 i386_physaddr_pae_t pte_pa;
320 i386_physaddr_pae_t a;
325 PTD = (i386_pde_pae_t *)vm->PTD;
326 offset = va & I386_PAGE_MASK;
329 * If we are initializing (kernel page table descriptor pointer
330 * not yet set) then return pa == va to avoid infinite recursion.
333 s = _kvm_pa2off(kd, va, pa);
335 _kvm_err(kd, kd->program,
336 "_i386_vatop_pae: bootstrap data not in dump");
339 return (I386_PAGE_SIZE - offset);
342 pdeindex = va >> I386_PDRSHIFT_PAE;
343 pde = le64toh(PTD[pdeindex]);
344 if ((pde & I386_PG_V) == 0) {
345 _kvm_err(kd, kd->program, "_kvm_kvatop_pae: pde not valid");
349 if (pde & I386_PG_PS) {
351 * No second-level page table; ptd describes one 2MB
352 * page. (We assume that the kernel wouldn't set
353 * PG_PS without enabling it cr0).
355 offset = va & I386_PAGE_PS_MASK_PAE;
356 a = (pde & I386_PG_PS_FRAME_PAE) + offset;
357 s = _kvm_pa2off(kd, a, pa);
359 _kvm_err(kd, kd->program,
360 "_i386_vatop: 2MB page address not in dump");
363 return (I386_NBPDR_PAE - offset);
366 pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG_PAE - 1);
367 pte_pa = (pde & I386_PG_FRAME_PAE) + (pteindex * sizeof(pde));
369 s = _kvm_pa2off(kd, pte_pa, &ofs);
370 if (s < sizeof(pte)) {
371 _kvm_err(kd, kd->program, "_i386_vatop_pae: pdpe_pa not found");
375 /* XXX This has to be a physical address read, kvm_read is virtual */
376 if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) {
377 _kvm_syserr(kd, kd->program, "_i386_vatop_pae: read");
381 if ((pte & I386_PG_V) == 0) {
382 _kvm_err(kd, kd->program, "_i386_vatop_pae: pte not valid");
386 a = (pte & I386_PG_FRAME_PAE) + offset;
387 s = _kvm_pa2off(kd, a, pa);
389 _kvm_err(kd, kd->program,
390 "_i386_vatop_pae: address not in dump");
393 return (I386_PAGE_SIZE - offset);
396 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
401 _i386_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
405 _kvm_err(kd, 0, "vatop called in live kernel!");
409 return (_i386_vatop_pae(kd, va, pa));
411 return (_i386_vatop(kd, va, pa));
415 _i386_native(kvm_t *kd __unused)
425 static struct kvm_arch kvm_i386 = {
426 .ka_probe = _i386_probe,
427 .ka_initvtop = _i386_initvtop,
428 .ka_freevtop = _i386_freevtop,
429 .ka_kvatop = _i386_kvatop,
430 .ka_native = _i386_native,