1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/*-
* Copyright (c) 1989, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software developed by the Computer Systems
* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
* BG 91-66 and contributed to Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93";
#endif
#endif /* LIBC_SCCS and not lint */
/*
* i386 machine dependent routines for kvm. Hopefully, the forthcoming
* vm code will one day obsolete this module.
*/
#include <sys/param.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <limits.h>
#include "kvm_private.h"
#ifndef btop
#define btop(x) (i386_btop(x))
#define ptob(x) (i386_ptob(x))
#endif
struct vmstate {
pd_entry_t *PTD;
};
void
_kvm_freevtop(kvm_t *kd)
{
if (kd->vmst != 0) {
if (kd->vmst->PTD) {
free(kd->vmst->PTD);
}
free(kd->vmst);
}
}
int
_kvm_initvtop(kvm_t *kd)
{
struct vmstate *vm;
struct nlist nlist[2];
u_long pa;
u_long kernbase;
pd_entry_t *PTD;
vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
if (vm == 0) {
_kvm_err(kd, kd->program, "cannot allocate vm");
return (-1);
}
kd->vmst = vm;
vm->PTD = 0;
nlist[0].n_name = "kernbase";
nlist[1].n_name = 0;
if (kvm_nlist(kd, nlist) != 0)
kernbase = KERNBASE; /* for old kernels */
else
kernbase = nlist[0].n_value;
nlist[0].n_name = "IdlePTD";
nlist[1].n_name = 0;
if (kvm_nlist(kd, nlist) != 0) {
_kvm_err(kd, kd->program, "bad namelist");
return (-1);
}
if (kvm_read(kd, (nlist[0].n_value - kernbase), &pa, sizeof(pa)) !=
sizeof(pa)) {
_kvm_err(kd, kd->program, "cannot read IdlePTD");
return (-1);
}
PTD = _kvm_malloc(kd, PAGE_SIZE);
if (kvm_read(kd, pa, PTD, PAGE_SIZE) != PAGE_SIZE) {
_kvm_err(kd, kd->program, "cannot read PTD");
return (-1);
}
vm->PTD = PTD;
return (0);
}
static int
_kvm_vatop(kvm_t *kd, u_long va, u_long *pa)
{
struct vmstate *vm;
u_long offset;
u_long pte_pa;
pd_entry_t pde;
pt_entry_t pte;
u_long pdeindex;
u_long pteindex;
int i;
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return((off_t)0);
}
vm = kd->vmst;
offset = va & (PAGE_SIZE - 1);
/*
* If we are initializing (kernel page table descriptor pointer
* not yet set) then return pa == va to avoid infinite recursion.
*/
if (vm->PTD == 0) {
*pa = va;
return (PAGE_SIZE - offset);
}
pdeindex = va >> PDRSHIFT;
pde = vm->PTD[pdeindex];
if (((u_long)pde & PG_V) == 0)
goto invalid;
if ((u_long)pde & PG_PS) {
/*
* No second-level page table; ptd describes one 4MB page.
* (We assume that the kernel wouldn't set PG_PS without enabling
* it cr0, and that the kernel doesn't support 36-bit physical
* addresses).
*/
#define PAGE4M_MASK (NBPDR - 1)
#define PG_FRAME4M (~PAGE4M_MASK)
*pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK);
return (NBPDR - (va & PAGE4M_MASK));
}
pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1);
pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pt_entry_t));
/* XXX This has to be a physical address read, kvm_read is virtual */
if (lseek(kd->pmfd, pte_pa, 0) == -1) {
_kvm_syserr(kd, kd->program, "_kvm_vatop: lseek");
goto invalid;
}
if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
_kvm_syserr(kd, kd->program, "_kvm_vatop: read");
goto invalid;
}
if (((u_long)pte & PG_V) == 0)
goto invalid;
*pa = ((u_long)pte & PG_FRAME) + offset;
return (PAGE_SIZE - offset);
invalid:
_kvm_err(kd, 0, "invalid address (%x)", va);
return (0);
}
int
_kvm_kvatop(kvm_t *kd, u_long va, u_long *pa)
{
return (_kvm_vatop(kd, va, pa));
}
|
