This source file includes following definitions.
- version_show
- boot_params_data_read
- kobj_to_setup_data_nr
- get_setup_data_paddr
- get_setup_data_size
- type_show
- setup_data_data_read
- create_setup_data_node
- cleanup_setup_data_node
- get_setup_data_total_num
- create_setup_data_nodes
- boot_params_ksysfs_init
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11 #include <linux/kobject.h>
12 #include <linux/string.h>
13 #include <linux/sysfs.h>
14 #include <linux/init.h>
15 #include <linux/stat.h>
16 #include <linux/slab.h>
17 #include <linux/mm.h>
18 #include <linux/io.h>
19
20 #include <asm/setup.h>
21
22 static ssize_t version_show(struct kobject *kobj,
23 struct kobj_attribute *attr, char *buf)
24 {
25 return sprintf(buf, "0x%04x\n", boot_params.hdr.version);
26 }
27
28 static struct kobj_attribute boot_params_version_attr = __ATTR_RO(version);
29
30 static ssize_t boot_params_data_read(struct file *fp, struct kobject *kobj,
31 struct bin_attribute *bin_attr,
32 char *buf, loff_t off, size_t count)
33 {
34 memcpy(buf, (void *)&boot_params + off, count);
35 return count;
36 }
37
38 static struct bin_attribute boot_params_data_attr = {
39 .attr = {
40 .name = "data",
41 .mode = S_IRUGO,
42 },
43 .read = boot_params_data_read,
44 .size = sizeof(boot_params),
45 };
46
47 static struct attribute *boot_params_version_attrs[] = {
48 &boot_params_version_attr.attr,
49 NULL,
50 };
51
52 static struct bin_attribute *boot_params_data_attrs[] = {
53 &boot_params_data_attr,
54 NULL,
55 };
56
57 static const struct attribute_group boot_params_attr_group = {
58 .attrs = boot_params_version_attrs,
59 .bin_attrs = boot_params_data_attrs,
60 };
61
62 static int kobj_to_setup_data_nr(struct kobject *kobj, int *nr)
63 {
64 const char *name;
65
66 name = kobject_name(kobj);
67 return kstrtoint(name, 10, nr);
68 }
69
70 static int get_setup_data_paddr(int nr, u64 *paddr)
71 {
72 int i = 0;
73 struct setup_data *data;
74 u64 pa_data = boot_params.hdr.setup_data;
75
76 while (pa_data) {
77 if (nr == i) {
78 *paddr = pa_data;
79 return 0;
80 }
81 data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
82 if (!data)
83 return -ENOMEM;
84
85 pa_data = data->next;
86 memunmap(data);
87 i++;
88 }
89 return -EINVAL;
90 }
91
92 static int __init get_setup_data_size(int nr, size_t *size)
93 {
94 int i = 0;
95 struct setup_data *data;
96 u64 pa_data = boot_params.hdr.setup_data;
97
98 while (pa_data) {
99 data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
100 if (!data)
101 return -ENOMEM;
102 if (nr == i) {
103 *size = data->len;
104 memunmap(data);
105 return 0;
106 }
107
108 pa_data = data->next;
109 memunmap(data);
110 i++;
111 }
112 return -EINVAL;
113 }
114
115 static ssize_t type_show(struct kobject *kobj,
116 struct kobj_attribute *attr, char *buf)
117 {
118 int nr, ret;
119 u64 paddr;
120 struct setup_data *data;
121
122 ret = kobj_to_setup_data_nr(kobj, &nr);
123 if (ret)
124 return ret;
125
126 ret = get_setup_data_paddr(nr, &paddr);
127 if (ret)
128 return ret;
129 data = memremap(paddr, sizeof(*data), MEMREMAP_WB);
130 if (!data)
131 return -ENOMEM;
132
133 ret = sprintf(buf, "0x%x\n", data->type);
134 memunmap(data);
135 return ret;
136 }
137
138 static ssize_t setup_data_data_read(struct file *fp,
139 struct kobject *kobj,
140 struct bin_attribute *bin_attr,
141 char *buf,
142 loff_t off, size_t count)
143 {
144 int nr, ret = 0;
145 u64 paddr;
146 struct setup_data *data;
147 void *p;
148
149 ret = kobj_to_setup_data_nr(kobj, &nr);
150 if (ret)
151 return ret;
152
153 ret = get_setup_data_paddr(nr, &paddr);
154 if (ret)
155 return ret;
156 data = memremap(paddr, sizeof(*data), MEMREMAP_WB);
157 if (!data)
158 return -ENOMEM;
159
160 if (off > data->len) {
161 ret = -EINVAL;
162 goto out;
163 }
164
165 if (count > data->len - off)
166 count = data->len - off;
167
168 if (!count)
169 goto out;
170
171 ret = count;
172 p = memremap(paddr + sizeof(*data), data->len, MEMREMAP_WB);
173 if (!p) {
174 ret = -ENOMEM;
175 goto out;
176 }
177 memcpy(buf, p + off, count);
178 memunmap(p);
179 out:
180 memunmap(data);
181 return ret;
182 }
183
184 static struct kobj_attribute type_attr = __ATTR_RO(type);
185
186 static struct bin_attribute data_attr __ro_after_init = {
187 .attr = {
188 .name = "data",
189 .mode = S_IRUGO,
190 },
191 .read = setup_data_data_read,
192 };
193
194 static struct attribute *setup_data_type_attrs[] = {
195 &type_attr.attr,
196 NULL,
197 };
198
199 static struct bin_attribute *setup_data_data_attrs[] = {
200 &data_attr,
201 NULL,
202 };
203
204 static const struct attribute_group setup_data_attr_group = {
205 .attrs = setup_data_type_attrs,
206 .bin_attrs = setup_data_data_attrs,
207 };
208
209 static int __init create_setup_data_node(struct kobject *parent,
210 struct kobject **kobjp, int nr)
211 {
212 int ret = 0;
213 size_t size;
214 struct kobject *kobj;
215 char name[16];
216 snprintf(name, 16, "%d", nr);
217
218 kobj = kobject_create_and_add(name, parent);
219 if (!kobj)
220 return -ENOMEM;
221
222 ret = get_setup_data_size(nr, &size);
223 if (ret)
224 goto out_kobj;
225
226 data_attr.size = size;
227 ret = sysfs_create_group(kobj, &setup_data_attr_group);
228 if (ret)
229 goto out_kobj;
230 *kobjp = kobj;
231
232 return 0;
233 out_kobj:
234 kobject_put(kobj);
235 return ret;
236 }
237
238 static void __init cleanup_setup_data_node(struct kobject *kobj)
239 {
240 sysfs_remove_group(kobj, &setup_data_attr_group);
241 kobject_put(kobj);
242 }
243
244 static int __init get_setup_data_total_num(u64 pa_data, int *nr)
245 {
246 int ret = 0;
247 struct setup_data *data;
248
249 *nr = 0;
250 while (pa_data) {
251 *nr += 1;
252 data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
253 if (!data) {
254 ret = -ENOMEM;
255 goto out;
256 }
257 pa_data = data->next;
258 memunmap(data);
259 }
260
261 out:
262 return ret;
263 }
264
265 static int __init create_setup_data_nodes(struct kobject *parent)
266 {
267 struct kobject *setup_data_kobj, **kobjp;
268 u64 pa_data;
269 int i, j, nr, ret = 0;
270
271 pa_data = boot_params.hdr.setup_data;
272 if (!pa_data)
273 return 0;
274
275 setup_data_kobj = kobject_create_and_add("setup_data", parent);
276 if (!setup_data_kobj) {
277 ret = -ENOMEM;
278 goto out;
279 }
280
281 ret = get_setup_data_total_num(pa_data, &nr);
282 if (ret)
283 goto out_setup_data_kobj;
284
285 kobjp = kmalloc_array(nr, sizeof(*kobjp), GFP_KERNEL);
286 if (!kobjp) {
287 ret = -ENOMEM;
288 goto out_setup_data_kobj;
289 }
290
291 for (i = 0; i < nr; i++) {
292 ret = create_setup_data_node(setup_data_kobj, kobjp + i, i);
293 if (ret)
294 goto out_clean_nodes;
295 }
296
297 kfree(kobjp);
298 return 0;
299
300 out_clean_nodes:
301 for (j = i - 1; j >= 0; j--)
302 cleanup_setup_data_node(*(kobjp + j));
303 kfree(kobjp);
304 out_setup_data_kobj:
305 kobject_put(setup_data_kobj);
306 out:
307 return ret;
308 }
309
310 static int __init boot_params_ksysfs_init(void)
311 {
312 int ret;
313 struct kobject *boot_params_kobj;
314
315 boot_params_kobj = kobject_create_and_add("boot_params",
316 kernel_kobj);
317 if (!boot_params_kobj) {
318 ret = -ENOMEM;
319 goto out;
320 }
321
322 ret = sysfs_create_group(boot_params_kobj, &boot_params_attr_group);
323 if (ret)
324 goto out_boot_params_kobj;
325
326 ret = create_setup_data_nodes(boot_params_kobj);
327 if (ret)
328 goto out_create_group;
329
330 return 0;
331 out_create_group:
332 sysfs_remove_group(boot_params_kobj, &boot_params_attr_group);
333 out_boot_params_kobj:
334 kobject_put(boot_params_kobj);
335 out:
336 return ret;
337 }
338
339 arch_initcall(boot_params_ksysfs_init);