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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36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38 __SCCSID("@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93");
41 * i386 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>
55 #include <machine/vmparam.h> /* For KERNBASE. */
60 #include "kvm_private.h"
71 * Translate a physical memory address to a file-offset in the crash-dump.
74 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs)
76 struct vmstate *vm = kd->vmst;
82 return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK));
87 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
91 *ofs = (pa - p->p_paddr) + p->p_offset;
92 return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK));
96 _i386_freevtop(kvm_t *kd)
98 struct vmstate *vm = kd->vmst;
108 _i386_probe(kvm_t *kd)
111 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) &&
112 !_kvm_is_minidump(kd));
116 _i386_initvtop(kvm_t *kd)
118 struct kvm_nlist nl[2];
124 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(struct vmstate));
125 if (kd->vmst == NULL) {
126 _kvm_err(kd, kd->program, "cannot allocate vm");
131 if (kd->rawdump == 0) {
132 if (_kvm_read_core_phdrs(kd, &kd->vmst->phnum,
133 &kd->vmst->phdr) == -1)
137 nl[0].n_name = "kernbase";
140 if (kvm_nlist2(kd, nl) != 0) {
142 kernbase = KERNBASE; /* for old kernels */
144 _kvm_err(kd, kd->program, "cannot resolve kernbase");
148 kernbase = nl[0].n_value;
150 nl[0].n_name = "IdlePDPT";
153 if (kvm_nlist2(kd, nl) == 0) {
154 i386_physaddr_pae_t pa64;
156 if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa,
157 sizeof(pa)) != sizeof(pa)) {
158 _kvm_err(kd, kd->program, "cannot read IdlePDPT");
162 PTD = _kvm_malloc(kd, 4 * I386_PAGE_SIZE);
164 _kvm_err(kd, kd->program, "cannot allocate PTD");
167 for (i = 0; i < 4; i++) {
168 if (kvm_read2(kd, pa + (i * sizeof(pa64)), &pa64,
169 sizeof(pa64)) != sizeof(pa64)) {
170 _kvm_err(kd, kd->program, "Cannot read PDPT");
174 pa64 = le64toh(pa64);
175 if (kvm_read2(kd, pa64 & I386_PG_FRAME_PAE,
176 PTD + (i * I386_PAGE_SIZE), I386_PAGE_SIZE) !=
178 _kvm_err(kd, kd->program, "cannot read PDPT");
186 nl[0].n_name = "IdlePTD";
189 if (kvm_nlist2(kd, nl) != 0) {
190 _kvm_err(kd, kd->program, "bad namelist");
193 if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa,
194 sizeof(pa)) != sizeof(pa)) {
195 _kvm_err(kd, kd->program, "cannot read IdlePTD");
199 PTD = _kvm_malloc(kd, I386_PAGE_SIZE);
201 _kvm_err(kd, kd->program, "cannot allocate PTD");
204 if (kvm_read2(kd, pa, PTD, I386_PAGE_SIZE) != I386_PAGE_SIZE) {
205 _kvm_err(kd, kd->program, "cannot read PTD");
215 _i386_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
218 i386_physaddr_t offset;
219 i386_physaddr_t pte_pa;
230 PTD = (i386_pde_t *)vm->PTD;
231 offset = va & I386_PAGE_MASK;
234 * If we are initializing (kernel page table descriptor pointer
235 * not yet set) then return pa == va to avoid infinite recursion.
238 s = _kvm_pa2off(kd, va, pa);
240 _kvm_err(kd, kd->program,
241 "_i386_vatop: bootstrap data not in dump");
244 return (I386_PAGE_SIZE - offset);
247 pdeindex = va >> I386_PDRSHIFT;
248 pde = le32toh(PTD[pdeindex]);
249 if ((pde & I386_PG_V) == 0) {
250 _kvm_err(kd, kd->program, "_i386_vatop: pde not valid");
254 if (pde & I386_PG_PS) {
256 * No second-level page table; ptd describes one 4MB
257 * page. (We assume that the kernel wouldn't set
258 * PG_PS without enabling it cr0).
260 offset = va & I386_PAGE_PS_MASK;
261 a = (pde & I386_PG_PS_FRAME) + offset;
262 s = _kvm_pa2off(kd, a, pa);
264 _kvm_err(kd, kd->program,
265 "_i386_vatop: 4MB page address not in dump");
268 return (I386_NBPDR - offset);
271 pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG - 1);
272 pte_pa = (pde & I386_PG_FRAME) + (pteindex * sizeof(pte));
274 s = _kvm_pa2off(kd, pte_pa, &ofs);
275 if (s < sizeof(pte)) {
276 _kvm_err(kd, kd->program, "_i386_vatop: pte_pa not found");
280 /* XXX This has to be a physical address read, kvm_read is virtual */
281 if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) {
282 _kvm_syserr(kd, kd->program, "_i386_vatop: pread");
286 if ((pte & I386_PG_V) == 0) {
287 _kvm_err(kd, kd->program, "_kvm_kvatop: pte not valid");
291 a = (pte & I386_PG_FRAME) + offset;
292 s = _kvm_pa2off(kd, a, pa);
294 _kvm_err(kd, kd->program, "_i386_vatop: address not in dump");
297 return (I386_PAGE_SIZE - offset);
300 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
305 _i386_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa)
308 i386_physaddr_pae_t offset;
309 i386_physaddr_pae_t pte_pa;
315 i386_physaddr_pae_t a;
320 PTD = (i386_pde_pae_t *)vm->PTD;
321 offset = va & I386_PAGE_MASK;
324 * If we are initializing (kernel page table descriptor pointer
325 * not yet set) then return pa == va to avoid infinite recursion.
328 s = _kvm_pa2off(kd, va, pa);
330 _kvm_err(kd, kd->program,
331 "_i386_vatop_pae: bootstrap data not in dump");
334 return (I386_PAGE_SIZE - offset);
337 pdeindex = va >> I386_PDRSHIFT_PAE;
338 pde = le64toh(PTD[pdeindex]);
339 if ((pde & I386_PG_V) == 0) {
340 _kvm_err(kd, kd->program, "_kvm_kvatop_pae: pde not valid");
344 if (pde & I386_PG_PS) {
346 * No second-level page table; ptd describes one 2MB
347 * page. (We assume that the kernel wouldn't set
348 * PG_PS without enabling it cr0).
350 offset = va & I386_PAGE_PS_MASK_PAE;
351 a = (pde & I386_PG_PS_FRAME_PAE) + offset;
352 s = _kvm_pa2off(kd, a, pa);
354 _kvm_err(kd, kd->program,
355 "_i386_vatop: 2MB page address not in dump");
358 return (I386_NBPDR_PAE - offset);
361 pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG_PAE - 1);
362 pte_pa = (pde & I386_PG_FRAME_PAE) + (pteindex * sizeof(pde));
364 s = _kvm_pa2off(kd, pte_pa, &ofs);
365 if (s < sizeof(pte)) {
366 _kvm_err(kd, kd->program, "_i386_vatop_pae: pdpe_pa not found");
370 /* XXX This has to be a physical address read, kvm_read is virtual */
371 if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) {
372 _kvm_syserr(kd, kd->program, "_i386_vatop_pae: read");
376 if ((pte & I386_PG_V) == 0) {
377 _kvm_err(kd, kd->program, "_i386_vatop_pae: pte not valid");
381 a = (pte & I386_PG_FRAME_PAE) + offset;
382 s = _kvm_pa2off(kd, a, pa);
384 _kvm_err(kd, kd->program,
385 "_i386_vatop_pae: address not in dump");
388 return (I386_PAGE_SIZE - offset);
391 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
396 _i386_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
400 _kvm_err(kd, 0, "vatop called in live kernel!");
404 return (_i386_vatop_pae(kd, va, pa));
406 return (_i386_vatop(kd, va, pa));
410 _i386_native(kvm_t *kd __unused)
420 static struct kvm_arch kvm_i386 = {
421 .ka_probe = _i386_probe,
422 .ka_initvtop = _i386_initvtop,
423 .ka_freevtop = _i386_freevtop,
424 .ka_kvatop = _i386_kvatop,
425 .ka_native = _i386_native,