Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * srm_env.c - Access to SRM environment | |
3 | * variables through linux' procfs | |
4 | * | |
16b7f4dc | 5 | * (C) 2001,2002,2006 by Jan-Benedict Glaw <jbglaw@lug-owl.de> |
1da177e4 | 6 | * |
395cf969 PB |
7 | * This driver is a modified version of Erik Mouw's example proc |
8 | * interface, so: thank you, Erik! He can be reached via email at | |
1da177e4 LT |
9 | * <J.A.K.Mouw@its.tudelft.nl>. It is based on an idea |
10 | * provided by DEC^WCompaq^WIntel's "Jumpstart" CD. They | |
11 | * included a patch like this as well. Thanks for idea! | |
12 | * | |
13 | * This program is free software; you can redistribute | |
14 | * it and/or modify it under the terms of the GNU General | |
15 | * Public License version 2 as published by the Free Software | |
16 | * Foundation. | |
17 | * | |
18 | * This program is distributed in the hope that it will be | |
19 | * useful, but WITHOUT ANY WARRANTY; without even the implied | |
20 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR | |
21 | * PURPOSE. See the GNU General Public License for more | |
22 | * details. | |
16b7f4dc | 23 | * |
1da177e4 LT |
24 | * You should have received a copy of the GNU General Public |
25 | * License along with this program; if not, write to the | |
26 | * Free Software Foundation, Inc., 59 Temple Place, | |
27 | * Suite 330, Boston, MA 02111-1307 USA | |
28 | * | |
29 | */ | |
30 | ||
1da177e4 | 31 | #include <linux/kernel.h> |
5a0e3ad6 | 32 | #include <linux/gfp.h> |
1da177e4 LT |
33 | #include <linux/module.h> |
34 | #include <linux/init.h> | |
35 | #include <linux/proc_fs.h> | |
0ead0f84 | 36 | #include <linux/seq_file.h> |
1da177e4 LT |
37 | #include <asm/console.h> |
38 | #include <asm/uaccess.h> | |
39 | #include <asm/machvec.h> | |
40 | ||
41 | #define BASE_DIR "srm_environment" /* Subdir in /proc/ */ | |
42 | #define NAMED_DIR "named_variables" /* Subdir for known variables */ | |
43 | #define NUMBERED_DIR "numbered_variables" /* Subdir for all variables */ | |
16b7f4dc | 44 | #define VERSION "0.0.6" /* Module version */ |
1da177e4 LT |
45 | #define NAME "srm_env" /* Module name */ |
46 | ||
47 | MODULE_AUTHOR("Jan-Benedict Glaw <jbglaw@lug-owl.de>"); | |
48 | MODULE_DESCRIPTION("Accessing Alpha SRM environment through procfs interface"); | |
49 | MODULE_LICENSE("GPL"); | |
50 | ||
51 | typedef struct _srm_env { | |
52 | char *name; | |
53 | unsigned long id; | |
54 | struct proc_dir_entry *proc_entry; | |
55 | } srm_env_t; | |
56 | ||
57 | static struct proc_dir_entry *base_dir; | |
58 | static struct proc_dir_entry *named_dir; | |
59 | static struct proc_dir_entry *numbered_dir; | |
60 | static char number[256][4]; | |
61 | ||
62 | static srm_env_t srm_named_entries[] = { | |
63 | { "auto_action", ENV_AUTO_ACTION }, | |
64 | { "boot_dev", ENV_BOOT_DEV }, | |
65 | { "bootdef_dev", ENV_BOOTDEF_DEV }, | |
66 | { "booted_dev", ENV_BOOTED_DEV }, | |
67 | { "boot_file", ENV_BOOT_FILE }, | |
68 | { "booted_file", ENV_BOOTED_FILE }, | |
69 | { "boot_osflags", ENV_BOOT_OSFLAGS }, | |
70 | { "booted_osflags", ENV_BOOTED_OSFLAGS }, | |
71 | { "boot_reset", ENV_BOOT_RESET }, | |
72 | { "dump_dev", ENV_DUMP_DEV }, | |
73 | { "enable_audit", ENV_ENABLE_AUDIT }, | |
74 | { "license", ENV_LICENSE }, | |
75 | { "char_set", ENV_CHAR_SET }, | |
76 | { "language", ENV_LANGUAGE }, | |
77 | { "tty_dev", ENV_TTY_DEV }, | |
78 | { NULL, 0 }, | |
79 | }; | |
80 | static srm_env_t srm_numbered_entries[256]; | |
81 | ||
82 | ||
0ead0f84 | 83 | static int srm_env_proc_show(struct seq_file *m, void *v) |
1da177e4 | 84 | { |
1da177e4 LT |
85 | unsigned long ret; |
86 | srm_env_t *entry; | |
0ead0f84 | 87 | char *page; |
1da177e4 | 88 | |
af96f8a3 | 89 | entry = m->private; |
0ead0f84 AD |
90 | page = (char *)__get_free_page(GFP_USER); |
91 | if (!page) | |
92 | return -ENOMEM; | |
1da177e4 | 93 | |
0ead0f84 | 94 | ret = callback_getenv(entry->id, page, PAGE_SIZE); |
1da177e4 | 95 | |
16b7f4dc | 96 | if ((ret >> 61) == 0) { |
0ead0f84 AD |
97 | seq_write(m, page, ret); |
98 | ret = 0; | |
16b7f4dc | 99 | } else |
0ead0f84 AD |
100 | ret = -EFAULT; |
101 | free_page((unsigned long)page); | |
102 | return ret; | |
103 | } | |
1da177e4 | 104 | |
0ead0f84 AD |
105 | static int srm_env_proc_open(struct inode *inode, struct file *file) |
106 | { | |
107 | return single_open(file, srm_env_proc_show, PDE(inode)->data); | |
1da177e4 LT |
108 | } |
109 | ||
0ead0f84 AD |
110 | static ssize_t srm_env_proc_write(struct file *file, const char __user *buffer, |
111 | size_t count, loff_t *pos) | |
1da177e4 LT |
112 | { |
113 | int res; | |
0ead0f84 | 114 | srm_env_t *entry = PDE(file->f_path.dentry->d_inode)->data; |
1da177e4 LT |
115 | char *buf = (char *) __get_free_page(GFP_USER); |
116 | unsigned long ret1, ret2; | |
117 | ||
1da177e4 LT |
118 | if (!buf) |
119 | return -ENOMEM; | |
120 | ||
121 | res = -EINVAL; | |
122 | if (count >= PAGE_SIZE) | |
123 | goto out; | |
124 | ||
125 | res = -EFAULT; | |
126 | if (copy_from_user(buf, buffer, count)) | |
127 | goto out; | |
128 | buf[count] = '\0'; | |
129 | ||
130 | ret1 = callback_setenv(entry->id, buf, count); | |
131 | if ((ret1 >> 61) == 0) { | |
16b7f4dc | 132 | do |
1da177e4 LT |
133 | ret2 = callback_save_env(); |
134 | while((ret2 >> 61) == 1); | |
135 | res = (int) ret1; | |
136 | } | |
137 | ||
138 | out: | |
139 | free_page((unsigned long)buf); | |
140 | return res; | |
141 | } | |
142 | ||
0ead0f84 AD |
143 | static const struct file_operations srm_env_proc_fops = { |
144 | .owner = THIS_MODULE, | |
145 | .open = srm_env_proc_open, | |
146 | .read = seq_read, | |
147 | .llseek = seq_lseek, | |
148 | .release = single_release, | |
149 | .write = srm_env_proc_write, | |
150 | }; | |
151 | ||
1da177e4 LT |
152 | static void |
153 | srm_env_cleanup(void) | |
154 | { | |
155 | srm_env_t *entry; | |
156 | unsigned long var_num; | |
157 | ||
16b7f4dc | 158 | if (base_dir) { |
1da177e4 LT |
159 | /* |
160 | * Remove named entries | |
161 | */ | |
16b7f4dc | 162 | if (named_dir) { |
1da177e4 | 163 | entry = srm_named_entries; |
16b7f4dc JBG |
164 | while (entry->name != NULL && entry->id != 0) { |
165 | if (entry->proc_entry) { | |
1da177e4 LT |
166 | remove_proc_entry(entry->name, |
167 | named_dir); | |
168 | entry->proc_entry = NULL; | |
169 | } | |
170 | entry++; | |
171 | } | |
172 | remove_proc_entry(NAMED_DIR, base_dir); | |
173 | } | |
174 | ||
175 | /* | |
176 | * Remove numbered entries | |
177 | */ | |
16b7f4dc JBG |
178 | if (numbered_dir) { |
179 | for (var_num = 0; var_num <= 255; var_num++) { | |
1da177e4 LT |
180 | entry = &srm_numbered_entries[var_num]; |
181 | ||
16b7f4dc | 182 | if (entry->proc_entry) { |
1da177e4 LT |
183 | remove_proc_entry(entry->name, |
184 | numbered_dir); | |
185 | entry->proc_entry = NULL; | |
186 | entry->name = NULL; | |
187 | } | |
188 | } | |
189 | remove_proc_entry(NUMBERED_DIR, base_dir); | |
190 | } | |
191 | ||
192 | remove_proc_entry(BASE_DIR, NULL); | |
193 | } | |
194 | ||
195 | return; | |
196 | } | |
197 | ||
1da177e4 LT |
198 | static int __init |
199 | srm_env_init(void) | |
200 | { | |
201 | srm_env_t *entry; | |
202 | unsigned long var_num; | |
203 | ||
204 | /* | |
205 | * Check system | |
206 | */ | |
16b7f4dc | 207 | if (!alpha_using_srm) { |
1da177e4 LT |
208 | printk(KERN_INFO "%s: This Alpha system doesn't " |
209 | "know about SRM (or you've booted " | |
210 | "SRM->MILO->Linux, which gets " | |
bbb8d343 | 211 | "misdetected)...\n", __func__); |
1da177e4 LT |
212 | return -ENODEV; |
213 | } | |
214 | ||
215 | /* | |
216 | * Init numbers | |
217 | */ | |
16b7f4dc | 218 | for (var_num = 0; var_num <= 255; var_num++) |
1da177e4 LT |
219 | sprintf(number[var_num], "%ld", var_num); |
220 | ||
221 | /* | |
222 | * Create base directory | |
223 | */ | |
224 | base_dir = proc_mkdir(BASE_DIR, NULL); | |
16b7f4dc | 225 | if (!base_dir) { |
1da177e4 LT |
226 | printk(KERN_ERR "Couldn't create base dir /proc/%s\n", |
227 | BASE_DIR); | |
228 | goto cleanup; | |
229 | } | |
1da177e4 LT |
230 | |
231 | /* | |
232 | * Create per-name subdirectory | |
233 | */ | |
234 | named_dir = proc_mkdir(NAMED_DIR, base_dir); | |
16b7f4dc | 235 | if (!named_dir) { |
1da177e4 LT |
236 | printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n", |
237 | BASE_DIR, NAMED_DIR); | |
238 | goto cleanup; | |
239 | } | |
1da177e4 LT |
240 | |
241 | /* | |
242 | * Create per-number subdirectory | |
243 | */ | |
244 | numbered_dir = proc_mkdir(NUMBERED_DIR, base_dir); | |
16b7f4dc | 245 | if (!numbered_dir) { |
1da177e4 LT |
246 | printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n", |
247 | BASE_DIR, NUMBERED_DIR); | |
248 | goto cleanup; | |
249 | ||
250 | } | |
1da177e4 LT |
251 | |
252 | /* | |
253 | * Create all named nodes | |
254 | */ | |
255 | entry = srm_named_entries; | |
16b7f4dc | 256 | while (entry->name && entry->id) { |
0ead0f84 AD |
257 | entry->proc_entry = proc_create_data(entry->name, 0644, named_dir, |
258 | &srm_env_proc_fops, entry); | |
16b7f4dc | 259 | if (!entry->proc_entry) |
1da177e4 | 260 | goto cleanup; |
1da177e4 LT |
261 | entry++; |
262 | } | |
263 | ||
264 | /* | |
265 | * Create all numbered nodes | |
266 | */ | |
16b7f4dc | 267 | for (var_num = 0; var_num <= 255; var_num++) { |
1da177e4 LT |
268 | entry = &srm_numbered_entries[var_num]; |
269 | entry->name = number[var_num]; | |
270 | ||
0ead0f84 AD |
271 | entry->proc_entry = proc_create_data(entry->name, 0644, numbered_dir, |
272 | &srm_env_proc_fops, entry); | |
16b7f4dc | 273 | if (!entry->proc_entry) |
1da177e4 LT |
274 | goto cleanup; |
275 | ||
276 | entry->id = var_num; | |
1da177e4 LT |
277 | } |
278 | ||
279 | printk(KERN_INFO "%s: version %s loaded successfully\n", NAME, | |
280 | VERSION); | |
281 | ||
282 | return 0; | |
283 | ||
284 | cleanup: | |
285 | srm_env_cleanup(); | |
286 | ||
287 | return -ENOMEM; | |
288 | } | |
289 | ||
1da177e4 LT |
290 | static void __exit |
291 | srm_env_exit(void) | |
292 | { | |
293 | srm_env_cleanup(); | |
294 | printk(KERN_INFO "%s: unloaded successfully\n", NAME); | |
295 | ||
296 | return; | |
297 | } | |
298 | ||
1da177e4 LT |
299 | module_init(srm_env_init); |
300 | module_exit(srm_env_exit); |