Annotation of src/lib/libkvm/kvm_x86_64.c, Revision 1.4
1.4 ! agc 1: /* $NetBSD: kvm_x86_64.c,v 1.3 2002/06/05 22:01:55 fvdl Exp $ */
1.1 fvdl 2:
3: /*-
4: * Copyright (c) 1989, 1992, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
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.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
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.
1.4 ! agc 19: * 3. Neither the name of the University nor the names of its contributors
1.1 fvdl 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
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
33: * SUCH DAMAGE.
34: */
35:
36: #include <sys/cdefs.h>
37: #if defined(LIBC_SCCS) && !defined(lint)
38: #if 0
39: static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93";
40: #else
1.4 ! agc 41: __RCSID("$NetBSD: kvm_x86_64.c,v 1.3 2002/06/05 22:01:55 fvdl Exp $");
1.1 fvdl 42: #endif
43: #endif /* LIBC_SCCS and not lint */
44:
45: /*
46: * x86-64 machine dependent routines for kvm.
47: */
48:
49: #include <sys/param.h>
50: #include <sys/user.h>
51: #include <sys/proc.h>
52: #include <sys/stat.h>
53: #include <sys/kcore.h>
54: #include <machine/kcore.h>
55: #include <stdlib.h>
56: #include <unistd.h>
57: #include <nlist.h>
58: #include <kvm.h>
59:
60: #include <uvm/uvm_extern.h>
61:
62: #include <limits.h>
63: #include <db.h>
64:
65: #include "kvm_private.h"
66:
1.2 matt 67: #include <machine/pmap.h>
1.1 fvdl 68: #include <machine/pte.h>
1.2 matt 69: #include <machine/vmparam.h>
1.1 fvdl 70:
71: void
72: _kvm_freevtop(kd)
73: kvm_t *kd;
74: {
75:
76: /* Not actually used for anything right now, but safe. */
77: if (kd->vmst != 0)
78: free(kd->vmst);
79: }
80:
81: /*ARGSUSED*/
82: int
83: _kvm_initvtop(kd)
84: kvm_t *kd;
85: {
86:
87: return (0);
88: }
89:
90: /*
91: * Translate a kernel virtual address to a physical address.
92: */
93: int
94: _kvm_kvatop(kd, va, pa)
95: kvm_t *kd;
96: u_long va;
97: u_long *pa;
98: {
99: cpu_kcore_hdr_t *cpu_kh;
100: u_long page_off;
101: pd_entry_t pde;
102: pt_entry_t pte;
1.3 fvdl 103: paddr_t pde_pa, pte_pa;
1.1 fvdl 104:
105: if (ISALIVE(kd)) {
106: _kvm_err(kd, 0, "vatop called in live kernel!");
107: return (0);
108: }
109:
110: cpu_kh = kd->cpu_data;
111: page_off = va & PGOFSET;
112:
113: /*
1.3 fvdl 114: * Find and read all entries to get to the pa.
115: */
116:
117: /*
118: * Level 4.
119: */
120: pde_pa = cpu_kh->ptdpaddr + (pl4_i(va) * sizeof(pd_entry_t));
121: if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
122: _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
123: _kvm_syserr(kd, 0, "could not read PT level 4 entry");
124: goto lose;
125: }
126: if ((pde & PG_V) == 0) {
127: _kvm_err(kd, 0, "invalid translation (invalid level 4 PDE)");
128: goto lose;
129: }
130:
131: /*
132: * Level 3.
1.1 fvdl 133: */
1.3 fvdl 134: pde_pa = (pde_pa + PG_FRAME) + (pl3_i(va) * sizeof(pd_entry_t));
1.1 fvdl 135: if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
136: _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
1.3 fvdl 137: _kvm_syserr(kd, 0, "could not read PT level 3 entry");
138: goto lose;
139: }
140: if ((pde & PG_V) == 0) {
141: _kvm_err(kd, 0, "invalid translation (invalid level 3 PDE)");
1.1 fvdl 142: goto lose;
143: }
144:
145: /*
1.3 fvdl 146: * Level 2.
1.1 fvdl 147: */
1.3 fvdl 148: pde_pa = (pde_pa & PG_FRAME) + (pl2_i(va) * sizeof(pd_entry_t));
149: if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
150: _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
151: _kvm_syserr(kd, 0, "could not read PT level 2 entry");
152: goto lose;
153: }
1.1 fvdl 154: if ((pde & PG_V) == 0) {
1.3 fvdl 155: _kvm_err(kd, 0, "invalid translation (invalid level 2 PDE)");
1.1 fvdl 156: goto lose;
157: }
1.3 fvdl 158:
159:
160: /*
161: * Level 1.
162: */
163: pte_pa = (pde_pa & PG_FRAME) + (pl1_i(va) * sizeof(pt_entry_t));
1.1 fvdl 164: if (pread(kd->pmfd, (void *) &pte, sizeof(pte),
165: _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
166: _kvm_syserr(kd, 0, "could not read PTE");
167: goto lose;
168: }
169: /*
170: * Validate the PTE and return the physical address.
171: */
172: if ((pte & PG_V) == 0) {
173: _kvm_err(kd, 0, "invalid translation (invalid PTE)");
174: goto lose;
175: }
176: *pa = (pte & PG_FRAME) + page_off;
177: return (int)(NBPG - page_off);
178:
179: lose:
180: *pa = (u_long)~0L;
181: return (0);
182: }
183:
184: /*
185: * Translate a physical address to a file-offset in the crash dump.
186: */
187: off_t
188: _kvm_pa2off(kd, pa)
189: kvm_t *kd;
190: u_long pa;
191: {
192: cpu_kcore_hdr_t *cpu_kh;
193: phys_ram_seg_t *ramsegs;
194: off_t off;
195: int i;
196:
197: cpu_kh = kd->cpu_data;
198: ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh));
199:
200: off = 0;
201: for (i = 0; i < cpu_kh->nmemsegs; i++) {
202: if (pa >= ramsegs[i].start &&
203: (pa - ramsegs[i].start) < ramsegs[i].size) {
204: off += (pa - ramsegs[i].start);
205: break;
206: }
207: off += ramsegs[i].size;
208: }
209:
210: return (kd->dump_off + off);
211: }
212:
213: /*
214: * Machine-dependent initialization for ALL open kvm descriptors,
215: * not just those for a kernel crash dump. Some architectures
216: * have to deal with these NOT being constants! (i.e. m68k)
217: */
218: int
219: _kvm_mdopen(kd)
220: kvm_t *kd;
221: {
222:
223: kd->usrstack = USRSTACK;
224: kd->min_uva = VM_MIN_ADDRESS;
225: kd->max_uva = VM_MAXUSER_ADDRESS;
226:
227: return (0);
228: }
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