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
|
/*
* linux/drivers/firmware/memmap.c
* Copyright (C) 2008 SUSE LINUX Products GmbH
* by Bernhard Walle <bwalle@suse.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2.0 as published by
* the Free Software Foundation
*
* This program 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 General Public License for more details.
*
*/
#include <linux/string.h>
#include <linux/firmware-map.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/bootmem.h>
/*
* Data types ------------------------------------------------------------------
*/
/*
* Firmware map entry. Because firmware memory maps are flat and not
* hierarchical, it's ok to organise them in a linked list. No parent
* information is necessary as for the resource tree.
*/
struct firmware_map_entry {
resource_size_t start; /* start of the memory range */
resource_size_t end; /* end of the memory range (incl.) */
const char *type; /* type of the memory range */
struct list_head list; /* entry for the linked list */
struct kobject kobj; /* kobject for each entry */
};
/*
* Forward declarations --------------------------------------------------------
*/
static ssize_t memmap_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf);
static ssize_t start_show(struct firmware_map_entry *entry, char *buf);
static ssize_t end_show(struct firmware_map_entry *entry, char *buf);
static ssize_t type_show(struct firmware_map_entry *entry, char *buf);
/*
* Static data -----------------------------------------------------------------
*/
struct memmap_attribute {
struct attribute attr;
ssize_t (*show)(struct firmware_map_entry *entry, char *buf);
};
struct memmap_attribute memmap_start_attr = __ATTR_RO(start);
struct memmap_attribute memmap_end_attr = __ATTR_RO(end);
struct memmap_attribute memmap_type_attr = __ATTR_RO(type);
/*
* These are default attributes that are added for every memmap entry.
*/
static struct attribute *def_attrs[] = {
&memmap_start_attr.attr,
&memmap_end_attr.attr,
&memmap_type_attr.attr,
NULL
};
static struct sysfs_ops memmap_attr_ops = {
.show = memmap_attr_show,
};
static struct kobj_type memmap_ktype = {
.sysfs_ops = &memmap_attr_ops,
.default_attrs = def_attrs,
};
/*
* Registration functions ------------------------------------------------------
*/
/*
* Firmware memory map entries
*/
static LIST_HEAD(map_entries);
/**
* Common implementation of firmware_map_add() and firmware_map_add_early()
* which expects a pre-allocated struct firmware_map_entry.
*
* @start: Start of the memory range.
* @end: End of the memory range (inclusive).
* @type: Type of the memory range.
* @entry: Pre-allocated (either kmalloc() or bootmem allocator), uninitialised
* entry.
*/
static int firmware_map_add_entry(resource_size_t start, resource_size_t end,
const char *type,
struct firmware_map_entry *entry)
{
BUG_ON(start > end);
entry->start = start;
entry->end = end;
entry->type = type;
INIT_LIST_HEAD(&entry->list);
kobject_init(&entry->kobj, &memmap_ktype);
list_add_tail(&entry->list, &map_entries);
return 0;
}
/*
* See <linux/firmware-map.h> for documentation.
*/
int firmware_map_add(resource_size_t start, resource_size_t end,
const char *type)
{
struct firmware_map_entry *entry;
entry = kmalloc(sizeof(struct firmware_map_entry), GFP_ATOMIC);
WARN_ON(!entry);
if (!entry)
return -ENOMEM;
return firmware_map_add_entry(start, end, type, entry);
}
/*
* See <linux/firmware-map.h> for documentation.
*/
int __init firmware_map_add_early(resource_size_t start, resource_size_t end,
const char *type)
{
struct firmware_map_entry *entry;
entry = alloc_bootmem_low(sizeof(struct firmware_map_entry));
WARN_ON(!entry);
if (!entry)
return -ENOMEM;
return firmware_map_add_entry(start, end, type, entry);
}
/*
* Sysfs functions -------------------------------------------------------------
*/
static ssize_t start_show(struct firmware_map_entry *entry, char *buf)
{
return snprintf(buf, PAGE_SIZE, "0x%llx\n",
(unsigned long long)entry->start);
}
static ssize_t end_show(struct firmware_map_entry *entry, char *buf)
{
return snprintf(buf, PAGE_SIZE, "0x%llx\n",
(unsigned long long)entry->end);
}
static ssize_t type_show(struct firmware_map_entry *entry, char *buf)
{
return snprintf(buf, PAGE_SIZE, "%s\n", entry->type);
}
#define to_memmap_attr(_attr) container_of(_attr, struct memmap_attribute, attr)
#define to_memmap_entry(obj) container_of(obj, struct firmware_map_entry, kobj)
static ssize_t memmap_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct firmware_map_entry *entry = to_memmap_entry(kobj);
struct memmap_attribute *memmap_attr = to_memmap_attr(attr);
return memmap_attr->show(entry, buf);
}
/*
* Initialises stuff and adds the entries in the map_entries list to
* sysfs. Important is that firmware_map_add() and firmware_map_add_early()
* must be called before late_initcall.
*/
static int __init memmap_init(void)
{
int i = 0;
struct firmware_map_entry *entry;
struct kset *memmap_kset;
memmap_kset = kset_create_and_add("memmap", NULL, firmware_kobj);
WARN_ON(!memmap_kset);
if (!memmap_kset)
return -ENOMEM;
list_for_each_entry(entry, &map_entries, list) {
entry->kobj.kset = memmap_kset;
kobject_add(&entry->kobj, NULL, "%d", i++);
}
return 0;
}
late_initcall(memmap_init);
|
