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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
22static 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
28static struct kobj_attribute boot_params_version_attr = __ATTR_RO(version);
29
30static 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
38static 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
47static struct attribute *boot_params_version_attrs[] = {
48 &boot_params_version_attr.attr,
49 NULL,
50};
51
52static struct bin_attribute *boot_params_data_attrs[] = {
53 &boot_params_data_attr,
54 NULL,
55};
56
57static const struct attribute_group boot_params_attr_group = {
58 .attrs = boot_params_version_attrs,
59 .bin_attrs = boot_params_data_attrs,
60};
61
62static 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
70static 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
92static 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 if (data->type == SETUP_INDIRECT &&
104 ((struct setup_indirect *)data->data)->type != SETUP_INDIRECT)
105 *size = ((struct setup_indirect *)data->data)->len;
106 else
107 *size = data->len;
108
109 memunmap(data);
110 return 0;
111 }
112
113 pa_data = data->next;
114 memunmap(data);
115 i++;
116 }
117 return -EINVAL;
118}
119
120static ssize_t type_show(struct kobject *kobj,
121 struct kobj_attribute *attr, char *buf)
122{
123 int nr, ret;
124 u64 paddr;
125 struct setup_data *data;
126
127 ret = kobj_to_setup_data_nr(kobj, &nr);
128 if (ret)
129 return ret;
130
131 ret = get_setup_data_paddr(nr, &paddr);
132 if (ret)
133 return ret;
134 data = memremap(paddr, sizeof(*data), MEMREMAP_WB);
135 if (!data)
136 return -ENOMEM;
137
138 if (data->type == SETUP_INDIRECT)
139 ret = sprintf(buf, "0x%x\n", ((struct setup_indirect *)data->data)->type);
140 else
141 ret = sprintf(buf, "0x%x\n", data->type);
142 memunmap(data);
143 return ret;
144}
145
146static ssize_t setup_data_data_read(struct file *fp,
147 struct kobject *kobj,
148 struct bin_attribute *bin_attr,
149 char *buf,
150 loff_t off, size_t count)
151{
152 int nr, ret = 0;
153 u64 paddr, len;
154 struct setup_data *data;
155 void *p;
156
157 ret = kobj_to_setup_data_nr(kobj, &nr);
158 if (ret)
159 return ret;
160
161 ret = get_setup_data_paddr(nr, &paddr);
162 if (ret)
163 return ret;
164 data = memremap(paddr, sizeof(*data), MEMREMAP_WB);
165 if (!data)
166 return -ENOMEM;
167
168 if (data->type == SETUP_INDIRECT &&
169 ((struct setup_indirect *)data->data)->type != SETUP_INDIRECT) {
170 paddr = ((struct setup_indirect *)data->data)->addr;
171 len = ((struct setup_indirect *)data->data)->len;
172 } else {
173 paddr += sizeof(*data);
174 len = data->len;
175 }
176
177 if (off > len) {
178 ret = -EINVAL;
179 goto out;
180 }
181
182 if (count > len - off)
183 count = len - off;
184
185 if (!count)
186 goto out;
187
188 ret = count;
189 p = memremap(paddr, len, MEMREMAP_WB);
190 if (!p) {
191 ret = -ENOMEM;
192 goto out;
193 }
194 memcpy(buf, p + off, count);
195 memunmap(p);
196out:
197 memunmap(data);
198 return ret;
199}
200
201static struct kobj_attribute type_attr = __ATTR_RO(type);
202
203static struct bin_attribute data_attr __ro_after_init = {
204 .attr = {
205 .name = "data",
206 .mode = S_IRUGO,
207 },
208 .read = setup_data_data_read,
209};
210
211static struct attribute *setup_data_type_attrs[] = {
212 &type_attr.attr,
213 NULL,
214};
215
216static struct bin_attribute *setup_data_data_attrs[] = {
217 &data_attr,
218 NULL,
219};
220
221static const struct attribute_group setup_data_attr_group = {
222 .attrs = setup_data_type_attrs,
223 .bin_attrs = setup_data_data_attrs,
224};
225
226static int __init create_setup_data_node(struct kobject *parent,
227 struct kobject **kobjp, int nr)
228{
229 int ret = 0;
230 size_t size;
231 struct kobject *kobj;
232 char name[16];
233 snprintf(name, 16, "%d", nr);
234
235 kobj = kobject_create_and_add(name, parent);
236 if (!kobj)
237 return -ENOMEM;
238
239 ret = get_setup_data_size(nr, &size);
240 if (ret)
241 goto out_kobj;
242
243 data_attr.size = size;
244 ret = sysfs_create_group(kobj, &setup_data_attr_group);
245 if (ret)
246 goto out_kobj;
247 *kobjp = kobj;
248
249 return 0;
250out_kobj:
251 kobject_put(kobj);
252 return ret;
253}
254
255static void __init cleanup_setup_data_node(struct kobject *kobj)
256{
257 sysfs_remove_group(kobj, &setup_data_attr_group);
258 kobject_put(kobj);
259}
260
261static int __init get_setup_data_total_num(u64 pa_data, int *nr)
262{
263 int ret = 0;
264 struct setup_data *data;
265
266 *nr = 0;
267 while (pa_data) {
268 *nr += 1;
269 data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
270 if (!data) {
271 ret = -ENOMEM;
272 goto out;
273 }
274 pa_data = data->next;
275 memunmap(data);
276 }
277
278out:
279 return ret;
280}
281
282static int __init create_setup_data_nodes(struct kobject *parent)
283{
284 struct kobject *setup_data_kobj, **kobjp;
285 u64 pa_data;
286 int i, j, nr, ret = 0;
287
288 pa_data = boot_params.hdr.setup_data;
289 if (!pa_data)
290 return 0;
291
292 setup_data_kobj = kobject_create_and_add("setup_data", parent);
293 if (!setup_data_kobj) {
294 ret = -ENOMEM;
295 goto out;
296 }
297
298 ret = get_setup_data_total_num(pa_data, &nr);
299 if (ret)
300 goto out_setup_data_kobj;
301
302 kobjp = kmalloc_array(nr, sizeof(*kobjp), GFP_KERNEL);
303 if (!kobjp) {
304 ret = -ENOMEM;
305 goto out_setup_data_kobj;
306 }
307
308 for (i = 0; i < nr; i++) {
309 ret = create_setup_data_node(setup_data_kobj, kobjp + i, i);
310 if (ret)
311 goto out_clean_nodes;
312 }
313
314 kfree(kobjp);
315 return 0;
316
317out_clean_nodes:
318 for (j = i - 1; j >= 0; j--)
319 cleanup_setup_data_node(*(kobjp + j));
320 kfree(kobjp);
321out_setup_data_kobj:
322 kobject_put(setup_data_kobj);
323out:
324 return ret;
325}
326
327static int __init boot_params_ksysfs_init(void)
328{
329 int ret;
330 struct kobject *boot_params_kobj;
331
332 boot_params_kobj = kobject_create_and_add("boot_params",
333 kernel_kobj);
334 if (!boot_params_kobj) {
335 ret = -ENOMEM;
336 goto out;
337 }
338
339 ret = sysfs_create_group(boot_params_kobj, &boot_params_attr_group);
340 if (ret)
341 goto out_boot_params_kobj;
342
343 ret = create_setup_data_nodes(boot_params_kobj);
344 if (ret)
345 goto out_create_group;
346
347 return 0;
348out_create_group:
349 sysfs_remove_group(boot_params_kobj, &boot_params_attr_group);
350out_boot_params_kobj:
351 kobject_put(boot_params_kobj);
352out:
353 return ret;
354}
355
356arch_initcall(boot_params_ksysfs_init);
357
