Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * kernel/ksysfs.c - sysfs attributes in /sys/kernel, which | |
3 | * are not related to any other subsystem | |
4 | * | |
5 | * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> | |
6 | * | |
7 | * This file is release under the GPLv2 | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/config.h> | |
12 | #include <linux/kobject.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/sysfs.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/init.h> | |
c330dda9 | 17 | #include <linux/kexec.h> |
1da177e4 LT |
18 | |
19 | #define KERNEL_ATTR_RO(_name) \ | |
20 | static struct subsys_attribute _name##_attr = __ATTR_RO(_name) | |
21 | ||
22 | #define KERNEL_ATTR_RW(_name) \ | |
23 | static struct subsys_attribute _name##_attr = \ | |
24 | __ATTR(_name, 0644, _name##_show, _name##_store) | |
25 | ||
f125b561 | 26 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
0f76e5ac KS |
27 | /* current uevent sequence number */ |
28 | static ssize_t uevent_seqnum_show(struct subsystem *subsys, char *page) | |
1da177e4 | 29 | { |
312c004d | 30 | return sprintf(page, "%llu\n", (unsigned long long)uevent_seqnum); |
1da177e4 | 31 | } |
0f76e5ac KS |
32 | KERNEL_ATTR_RO(uevent_seqnum); |
33 | ||
34 | /* uevent helper program, used during early boo */ | |
35 | static ssize_t uevent_helper_show(struct subsystem *subsys, char *page) | |
36 | { | |
312c004d | 37 | return sprintf(page, "%s\n", uevent_helper); |
0f76e5ac KS |
38 | } |
39 | static ssize_t uevent_helper_store(struct subsystem *subsys, const char *page, size_t count) | |
40 | { | |
312c004d | 41 | if (count+1 > UEVENT_HELPER_PATH_LEN) |
0f76e5ac | 42 | return -ENOENT; |
312c004d KS |
43 | memcpy(uevent_helper, page, count); |
44 | uevent_helper[count] = '\0'; | |
45 | if (count && uevent_helper[count-1] == '\n') | |
46 | uevent_helper[count-1] = '\0'; | |
0f76e5ac KS |
47 | return count; |
48 | } | |
49 | KERNEL_ATTR_RW(uevent_helper); | |
1da177e4 LT |
50 | #endif |
51 | ||
c330dda9 JM |
52 | #ifdef CONFIG_KEXEC |
53 | static ssize_t kexec_loaded_show(struct subsystem *subsys, char *page) | |
54 | { | |
55 | return sprintf(page, "%d\n", !!kexec_image); | |
56 | } | |
57 | KERNEL_ATTR_RO(kexec_loaded); | |
58 | ||
59 | static ssize_t kexec_crash_loaded_show(struct subsystem *subsys, char *page) | |
60 | { | |
61 | return sprintf(page, "%d\n", !!kexec_crash_image); | |
62 | } | |
63 | KERNEL_ATTR_RO(kexec_crash_loaded); | |
64 | #endif /* CONFIG_KEXEC */ | |
65 | ||
1da177e4 LT |
66 | decl_subsys(kernel, NULL, NULL); |
67 | EXPORT_SYMBOL_GPL(kernel_subsys); | |
68 | ||
69 | static struct attribute * kernel_attrs[] = { | |
f125b561 | 70 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
0f76e5ac KS |
71 | &uevent_seqnum_attr.attr, |
72 | &uevent_helper_attr.attr, | |
c330dda9 JM |
73 | #endif |
74 | #ifdef CONFIG_KEXEC | |
75 | &kexec_loaded_attr.attr, | |
76 | &kexec_crash_loaded_attr.attr, | |
1da177e4 LT |
77 | #endif |
78 | NULL | |
79 | }; | |
80 | ||
81 | static struct attribute_group kernel_attr_group = { | |
82 | .attrs = kernel_attrs, | |
83 | }; | |
84 | ||
85 | static int __init ksysfs_init(void) | |
86 | { | |
87 | int error = subsystem_register(&kernel_subsys); | |
88 | if (!error) | |
89 | error = sysfs_create_group(&kernel_subsys.kset.kobj, | |
90 | &kernel_attr_group); | |
91 | ||
92 | return error; | |
93 | } | |
94 | ||
95 | core_initcall(ksysfs_init); |