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
|
/*
* virtual page mapping
*
* Copyright (c) 2003 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <inttypes.h>
#include "cpu-i386.h"
/* XXX: pack the flags in the low bits of the pointer ? */
typedef struct PageDesc {
struct TranslationBlock *first_tb;
unsigned long flags;
} PageDesc;
#define L2_BITS 10
#define L1_BITS (32 - L2_BITS - TARGET_PAGE_BITS)
#define L1_SIZE (1 << L1_BITS)
#define L2_SIZE (1 << L2_BITS)
unsigned long real_host_page_size;
unsigned long host_page_bits;
unsigned long host_page_size;
unsigned long host_page_mask;
static PageDesc *l1_map[L1_SIZE];
void page_init(void)
{
/* NOTE: we can always suppose that host_page_size >=
TARGET_PAGE_SIZE */
real_host_page_size = getpagesize();
if (host_page_size == 0)
host_page_size = real_host_page_size;
if (host_page_size < TARGET_PAGE_SIZE)
host_page_size = TARGET_PAGE_SIZE;
host_page_bits = 0;
while ((1 << host_page_bits) < host_page_size)
host_page_bits++;
host_page_mask = ~(host_page_size - 1);
}
/* dump memory mappings */
void page_dump(FILE *f)
{
unsigned long start, end;
int i, j, prot, prot1;
PageDesc *p;
fprintf(f, "%-8s %-8s %-8s %s\n",
"start", "end", "size", "prot");
start = -1;
end = -1;
prot = 0;
for(i = 0; i <= L1_SIZE; i++) {
if (i < L1_SIZE)
p = l1_map[i];
else
p = NULL;
for(j = 0;j < L2_SIZE; j++) {
if (!p)
prot1 = 0;
else
prot1 = p[j].flags;
if (prot1 != prot) {
end = (i << (32 - L1_BITS)) | (j << TARGET_PAGE_BITS);
if (start != -1) {
fprintf(f, "%08lx-%08lx %08lx %c%c%c\n",
start, end, end - start,
prot & PAGE_READ ? 'r' : '-',
prot & PAGE_WRITE ? 'w' : '-',
prot & PAGE_EXEC ? 'x' : '-');
}
if (prot1 != 0)
start = end;
else
start = -1;
prot = prot1;
}
if (!p)
break;
}
}
}
static inline PageDesc *page_find_alloc(unsigned long address)
{
unsigned int index;
PageDesc **lp, *p;
index = address >> TARGET_PAGE_BITS;
lp = &l1_map[index >> L2_BITS];
p = *lp;
if (!p) {
/* allocate if not found */
p = malloc(sizeof(PageDesc) * L2_SIZE);
memset(p, 0, sizeof(sizeof(PageDesc) * L2_SIZE));
*lp = p;
}
return p + (index & (L2_SIZE - 1));
}
int page_get_flags(unsigned long address)
{
unsigned int index;
PageDesc *p;
index = address >> TARGET_PAGE_BITS;
p = l1_map[index >> L2_BITS];
if (!p)
return 0;
return p[index & (L2_SIZE - 1)].flags;
}
void page_set_flags(unsigned long start, unsigned long end, int flags)
{
PageDesc *p;
unsigned long addr;
start = start & TARGET_PAGE_MASK;
end = TARGET_PAGE_ALIGN(end);
for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
p = page_find_alloc(addr);
p->flags = flags;
}
}
|
