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
|
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <linux/mutex.h>
#include <asm/mtrr.h>
#include "mtrr.h"
static DEFINE_MUTEX(mtrr_mutex);
void generic_get_mtrr(unsigned int reg, unsigned long *base,
unsigned int *size, mtrr_type * type)
{
dom0_op_t op;
op.cmd = DOM0_READ_MEMTYPE;
op.u.read_memtype.reg = reg;
(void)HYPERVISOR_dom0_op(&op);
*size = op.u.read_memtype.nr_mfns;
*base = op.u.read_memtype.mfn;
*type = op.u.read_memtype.type;
}
struct mtrr_ops generic_mtrr_ops = {
.use_intel_if = 1,
.get = generic_get_mtrr,
};
struct mtrr_ops *mtrr_if = &generic_mtrr_ops;
unsigned int num_var_ranges;
unsigned int *usage_table;
static void __init set_num_var_ranges(void)
{
dom0_op_t op;
for (num_var_ranges = 0; ; num_var_ranges++) {
op.cmd = DOM0_READ_MEMTYPE;
op.u.read_memtype.reg = num_var_ranges;
if (HYPERVISOR_dom0_op(&op) != 0)
break;
}
}
static void __init init_table(void)
{
int i, max;
max = num_var_ranges;
if ((usage_table = kmalloc(max * sizeof *usage_table, GFP_KERNEL))
== NULL) {
printk(KERN_ERR "mtrr: could not allocate\n");
return;
}
for (i = 0; i < max; i++)
usage_table[i] = 0;
}
int mtrr_add_page(unsigned long base, unsigned long size,
unsigned int type, char increment)
{
int error;
dom0_op_t op;
mutex_lock(&mtrr_mutex);
op.cmd = DOM0_ADD_MEMTYPE;
op.u.add_memtype.mfn = base;
op.u.add_memtype.nr_mfns = size;
op.u.add_memtype.type = type;
error = HYPERVISOR_dom0_op(&op);
if (error) {
mutex_unlock(&mtrr_mutex);
BUG_ON(error > 0);
return error;
}
if (increment)
++usage_table[op.u.add_memtype.reg];
mutex_unlock(&mtrr_mutex);
return op.u.add_memtype.reg;
}
static int mtrr_check(unsigned long base, unsigned long size)
{
if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1))) {
printk(KERN_WARNING
"mtrr: size and base must be multiples of 4 kiB\n");
printk(KERN_DEBUG
"mtrr: size: 0x%lx base: 0x%lx\n", size, base);
dump_stack();
return -1;
}
return 0;
}
int
mtrr_add(unsigned long base, unsigned long size, unsigned int type,
char increment)
{
if (mtrr_check(base, size))
return -EINVAL;
return mtrr_add_page(base >> PAGE_SHIFT, size >> PAGE_SHIFT, type,
increment);
}
int mtrr_del_page(int reg, unsigned long base, unsigned long size)
{
unsigned i;
mtrr_type ltype;
unsigned long lbase;
unsigned int lsize;
int error = -EINVAL;
dom0_op_t op;
mutex_lock(&mtrr_mutex);
if (reg < 0) {
/* Search for existing MTRR */
for (i = 0; i < num_var_ranges; ++i) {
mtrr_if->get(i, &lbase, &lsize, <ype);
if (lbase == base && lsize == size) {
reg = i;
break;
}
}
if (reg < 0) {
printk(KERN_DEBUG "mtrr: no MTRR for %lx000,%lx000 found\n", base,
size);
goto out;
}
}
if (usage_table[reg] < 1) {
printk(KERN_WARNING "mtrr: reg: %d has count=0\n", reg);
goto out;
}
if (--usage_table[reg] < 1) {
op.cmd = DOM0_DEL_MEMTYPE;
op.u.del_memtype.handle = 0;
op.u.del_memtype.reg = reg;
error = HYPERVISOR_dom0_op(&op);
if (error) {
BUG_ON(error > 0);
goto out;
}
}
error = reg;
out:
mutex_unlock(&mtrr_mutex);
return error;
}
int
mtrr_del(int reg, unsigned long base, unsigned long size)
{
if (mtrr_check(base, size))
return -EINVAL;
return mtrr_del_page(reg, base >> PAGE_SHIFT, size >> PAGE_SHIFT);
}
EXPORT_SYMBOL(mtrr_add);
EXPORT_SYMBOL(mtrr_del);
void __init mtrr_bp_init(void)
{
}
void mtrr_ap_init(void)
{
}
static int __init mtrr_init(void)
{
struct cpuinfo_x86 *c = &boot_cpu_data;
if (!is_initial_xendomain())
return -ENODEV;
if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
(!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
(!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
(!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
return -ENODEV;
set_num_var_ranges();
init_table();
return 0;
}
subsys_initcall(mtrr_init);
|
