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; | |
1da177e4 LT |
54 | } srm_env_t; |
55 | ||
56 | static struct proc_dir_entry *base_dir; | |
57 | static struct proc_dir_entry *named_dir; | |
58 | static struct proc_dir_entry *numbered_dir; | |
1da177e4 LT |
59 | |
60 | static srm_env_t srm_named_entries[] = { | |
61 | { "auto_action", ENV_AUTO_ACTION }, | |
62 | { "boot_dev", ENV_BOOT_DEV }, | |
63 | { "bootdef_dev", ENV_BOOTDEF_DEV }, | |
64 | { "booted_dev", ENV_BOOTED_DEV }, | |
65 | { "boot_file", ENV_BOOT_FILE }, | |
66 | { "booted_file", ENV_BOOTED_FILE }, | |
67 | { "boot_osflags", ENV_BOOT_OSFLAGS }, | |
68 | { "booted_osflags", ENV_BOOTED_OSFLAGS }, | |
69 | { "boot_reset", ENV_BOOT_RESET }, | |
70 | { "dump_dev", ENV_DUMP_DEV }, | |
71 | { "enable_audit", ENV_ENABLE_AUDIT }, | |
72 | { "license", ENV_LICENSE }, | |
73 | { "char_set", ENV_CHAR_SET }, | |
74 | { "language", ENV_LANGUAGE }, | |
75 | { "tty_dev", ENV_TTY_DEV }, | |
76 | { NULL, 0 }, | |
77 | }; | |
1da177e4 | 78 | |
0ead0f84 | 79 | static int srm_env_proc_show(struct seq_file *m, void *v) |
1da177e4 | 80 | { |
1da177e4 | 81 | unsigned long ret; |
1c1ec6c6 | 82 | unsigned long id = (unsigned long)m->private; |
0ead0f84 | 83 | char *page; |
1da177e4 | 84 | |
0ead0f84 AD |
85 | page = (char *)__get_free_page(GFP_USER); |
86 | if (!page) | |
87 | return -ENOMEM; | |
1da177e4 | 88 | |
1c1ec6c6 | 89 | ret = callback_getenv(id, page, PAGE_SIZE); |
1da177e4 | 90 | |
16b7f4dc | 91 | if ((ret >> 61) == 0) { |
0ead0f84 AD |
92 | seq_write(m, page, ret); |
93 | ret = 0; | |
16b7f4dc | 94 | } else |
0ead0f84 AD |
95 | ret = -EFAULT; |
96 | free_page((unsigned long)page); | |
97 | return ret; | |
98 | } | |
1da177e4 | 99 | |
0ead0f84 AD |
100 | static int srm_env_proc_open(struct inode *inode, struct file *file) |
101 | { | |
d9dda78b | 102 | return single_open(file, srm_env_proc_show, PDE_DATA(inode)); |
1da177e4 LT |
103 | } |
104 | ||
0ead0f84 AD |
105 | static ssize_t srm_env_proc_write(struct file *file, const char __user *buffer, |
106 | size_t count, loff_t *pos) | |
1da177e4 LT |
107 | { |
108 | int res; | |
1c1ec6c6 | 109 | unsigned long id = (unsigned long)PDE_DATA(file_inode(file)); |
1da177e4 LT |
110 | char *buf = (char *) __get_free_page(GFP_USER); |
111 | unsigned long ret1, ret2; | |
112 | ||
1da177e4 LT |
113 | if (!buf) |
114 | return -ENOMEM; | |
115 | ||
116 | res = -EINVAL; | |
117 | if (count >= PAGE_SIZE) | |
118 | goto out; | |
119 | ||
120 | res = -EFAULT; | |
121 | if (copy_from_user(buf, buffer, count)) | |
122 | goto out; | |
123 | buf[count] = '\0'; | |
124 | ||
1c1ec6c6 | 125 | ret1 = callback_setenv(id, buf, count); |
1da177e4 | 126 | if ((ret1 >> 61) == 0) { |
16b7f4dc | 127 | do |
1da177e4 LT |
128 | ret2 = callback_save_env(); |
129 | while((ret2 >> 61) == 1); | |
130 | res = (int) ret1; | |
131 | } | |
132 | ||
133 | out: | |
134 | free_page((unsigned long)buf); | |
135 | return res; | |
136 | } | |
137 | ||
0ead0f84 AD |
138 | static const struct file_operations srm_env_proc_fops = { |
139 | .owner = THIS_MODULE, | |
140 | .open = srm_env_proc_open, | |
141 | .read = seq_read, | |
142 | .llseek = seq_lseek, | |
143 | .release = single_release, | |
144 | .write = srm_env_proc_write, | |
145 | }; | |
146 | ||
1da177e4 LT |
147 | static int __init |
148 | srm_env_init(void) | |
149 | { | |
150 | srm_env_t *entry; | |
151 | unsigned long var_num; | |
152 | ||
153 | /* | |
154 | * Check system | |
155 | */ | |
16b7f4dc | 156 | if (!alpha_using_srm) { |
1da177e4 LT |
157 | printk(KERN_INFO "%s: This Alpha system doesn't " |
158 | "know about SRM (or you've booted " | |
159 | "SRM->MILO->Linux, which gets " | |
bbb8d343 | 160 | "misdetected)...\n", __func__); |
1da177e4 LT |
161 | return -ENODEV; |
162 | } | |
163 | ||
1da177e4 LT |
164 | /* |
165 | * Create base directory | |
166 | */ | |
167 | base_dir = proc_mkdir(BASE_DIR, NULL); | |
16b7f4dc | 168 | if (!base_dir) { |
1da177e4 LT |
169 | printk(KERN_ERR "Couldn't create base dir /proc/%s\n", |
170 | BASE_DIR); | |
c35f2e49 | 171 | return -ENOMEM; |
1da177e4 | 172 | } |
1da177e4 LT |
173 | |
174 | /* | |
175 | * Create per-name subdirectory | |
176 | */ | |
177 | named_dir = proc_mkdir(NAMED_DIR, base_dir); | |
16b7f4dc | 178 | if (!named_dir) { |
1da177e4 LT |
179 | printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n", |
180 | BASE_DIR, NAMED_DIR); | |
181 | goto cleanup; | |
182 | } | |
1da177e4 LT |
183 | |
184 | /* | |
185 | * Create per-number subdirectory | |
186 | */ | |
187 | numbered_dir = proc_mkdir(NUMBERED_DIR, base_dir); | |
16b7f4dc | 188 | if (!numbered_dir) { |
1da177e4 LT |
189 | printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n", |
190 | BASE_DIR, NUMBERED_DIR); | |
191 | goto cleanup; | |
192 | ||
193 | } | |
1da177e4 LT |
194 | |
195 | /* | |
196 | * Create all named nodes | |
197 | */ | |
198 | entry = srm_named_entries; | |
16b7f4dc | 199 | while (entry->name && entry->id) { |
c35f2e49 | 200 | if (!proc_create_data(entry->name, 0644, named_dir, |
1c1ec6c6 | 201 | &srm_env_proc_fops, (void *)entry->id)) |
1da177e4 | 202 | goto cleanup; |
1da177e4 LT |
203 | entry++; |
204 | } | |
205 | ||
206 | /* | |
207 | * Create all numbered nodes | |
208 | */ | |
16b7f4dc | 209 | for (var_num = 0; var_num <= 255; var_num++) { |
1c1ec6c6 AV |
210 | char name[4]; |
211 | sprintf(name, "%ld", var_num); | |
212 | if (!proc_create_data(name, 0644, numbered_dir, | |
213 | &srm_env_proc_fops, (void *)var_num)) | |
1da177e4 | 214 | goto cleanup; |
1da177e4 LT |
215 | } |
216 | ||
217 | printk(KERN_INFO "%s: version %s loaded successfully\n", NAME, | |
218 | VERSION); | |
219 | ||
220 | return 0; | |
221 | ||
222 | cleanup: | |
c35f2e49 | 223 | remove_proc_subtree(BASE_DIR, NULL); |
1da177e4 LT |
224 | return -ENOMEM; |
225 | } | |
226 | ||
1da177e4 LT |
227 | static void __exit |
228 | srm_env_exit(void) | |
229 | { | |
c35f2e49 | 230 | remove_proc_subtree(BASE_DIR, NULL); |
1da177e4 | 231 | printk(KERN_INFO "%s: unloaded successfully\n", NAME); |
1da177e4 LT |
232 | } |
233 | ||
1da177e4 LT |
234 | module_init(srm_env_init); |
235 | module_exit(srm_env_exit); |