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1 | #ifndef _LINUX_MODULE_PARAMS_H |
2 | #define _LINUX_MODULE_PARAMS_H | |
3 | /* (C) Copyright 2001, 2002 Rusty Russell IBM Corporation */ | |
4 | #include <linux/init.h> | |
5 | #include <linux/stringify.h> | |
6 | #include <linux/kernel.h> | |
7 | ||
8 | /* You can override this manually, but generally this should match the | |
9 | module name. */ | |
10 | #ifdef MODULE | |
11 | #define MODULE_PARAM_PREFIX /* empty */ | |
12 | #else | |
367cb704 | 13 | #define MODULE_PARAM_PREFIX KBUILD_MODNAME "." |
1da177e4 LT |
14 | #endif |
15 | ||
16 | #ifdef MODULE | |
17 | #define ___module_cat(a,b) __mod_ ## a ## b | |
18 | #define __module_cat(a,b) ___module_cat(a,b) | |
19 | #define __MODULE_INFO(tag, name, info) \ | |
20 | static const char __module_cat(name,__LINE__)[] \ | |
21 | __attribute_used__ \ | |
22 | __attribute__((section(".modinfo"),unused)) = __stringify(tag) "=" info | |
23 | #else /* !MODULE */ | |
24 | #define __MODULE_INFO(tag, name, info) | |
25 | #endif | |
26 | #define __MODULE_PARM_TYPE(name, _type) \ | |
27 | __MODULE_INFO(parmtype, name##type, #name ":" _type) | |
28 | ||
29 | struct kernel_param; | |
30 | ||
31 | /* Returns 0, or -errno. arg is in kp->arg. */ | |
32 | typedef int (*param_set_fn)(const char *val, struct kernel_param *kp); | |
33 | /* Returns length written or -errno. Buffer is 4k (ie. be short!) */ | |
34 | typedef int (*param_get_fn)(char *buffer, struct kernel_param *kp); | |
35 | ||
36 | struct kernel_param { | |
37 | const char *name; | |
38 | unsigned int perm; | |
39 | param_set_fn set; | |
40 | param_get_fn get; | |
41 | void *arg; | |
42 | }; | |
43 | ||
44 | /* Special one for strings we want to copy into */ | |
45 | struct kparam_string { | |
46 | unsigned int maxlen; | |
47 | char *string; | |
48 | }; | |
49 | ||
50 | /* Special one for arrays */ | |
51 | struct kparam_array | |
52 | { | |
53 | unsigned int max; | |
54 | unsigned int *num; | |
55 | param_set_fn set; | |
56 | param_get_fn get; | |
57 | unsigned int elemsize; | |
58 | void *elem; | |
59 | }; | |
60 | ||
61 | /* This is the fundamental function for registering boot/module | |
405ae7d3 | 62 | parameters. perm sets the visibility in sysfs: 000 means it's |
1da177e4 LT |
63 | not there, read bits mean it's readable, write bits mean it's |
64 | writable. */ | |
65 | #define __module_param_call(prefix, name, set, get, arg, perm) \ | |
9774a1f5 AD |
66 | /* Default value instead of permissions? */ \ |
67 | static int __param_perm_check_##name __attribute__((unused)) = \ | |
68 | BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)); \ | |
1da177e4 LT |
69 | static char __param_str_##name[] = prefix #name; \ |
70 | static struct kernel_param const __param_##name \ | |
71 | __attribute_used__ \ | |
72 | __attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) \ | |
73 | = { __param_str_##name, perm, set, get, arg } | |
74 | ||
75 | #define module_param_call(name, set, get, arg, perm) \ | |
76 | __module_param_call(MODULE_PARAM_PREFIX, name, set, get, arg, perm) | |
77 | ||
78 | /* Helper functions: type is byte, short, ushort, int, uint, long, | |
79 | ulong, charp, bool or invbool, or XXX if you define param_get_XXX, | |
80 | param_set_XXX and param_check_XXX. */ | |
81 | #define module_param_named(name, value, type, perm) \ | |
82 | param_check_##type(name, &(value)); \ | |
83 | module_param_call(name, param_set_##type, param_get_##type, &value, perm); \ | |
84 | __MODULE_PARM_TYPE(name, #type) | |
85 | ||
86 | #define module_param(name, type, perm) \ | |
87 | module_param_named(name, name, type, perm) | |
88 | ||
89 | /* Actually copy string: maxlen param is usually sizeof(string). */ | |
90 | #define module_param_string(name, string, len, perm) \ | |
91 | static struct kparam_string __param_string_##name \ | |
92 | = { len, string }; \ | |
93 | module_param_call(name, param_set_copystring, param_get_string, \ | |
94 | &__param_string_##name, perm); \ | |
95 | __MODULE_PARM_TYPE(name, "string") | |
96 | ||
97 | /* Called on module insert or kernel boot */ | |
98 | extern int parse_args(const char *name, | |
99 | char *args, | |
100 | struct kernel_param *params, | |
101 | unsigned num, | |
102 | int (*unknown)(char *param, char *val)); | |
103 | ||
104 | /* All the helper functions */ | |
105 | /* The macros to do compile-time type checking stolen from Jakub | |
106 | Jelinek, who IIRC came up with this idea for the 2.4 module init code. */ | |
107 | #define __param_check(name, p, type) \ | |
108 | static inline type *__check_##name(void) { return(p); } | |
109 | ||
110 | extern int param_set_byte(const char *val, struct kernel_param *kp); | |
111 | extern int param_get_byte(char *buffer, struct kernel_param *kp); | |
112 | #define param_check_byte(name, p) __param_check(name, p, unsigned char) | |
113 | ||
114 | extern int param_set_short(const char *val, struct kernel_param *kp); | |
115 | extern int param_get_short(char *buffer, struct kernel_param *kp); | |
116 | #define param_check_short(name, p) __param_check(name, p, short) | |
117 | ||
118 | extern int param_set_ushort(const char *val, struct kernel_param *kp); | |
119 | extern int param_get_ushort(char *buffer, struct kernel_param *kp); | |
120 | #define param_check_ushort(name, p) __param_check(name, p, unsigned short) | |
121 | ||
122 | extern int param_set_int(const char *val, struct kernel_param *kp); | |
123 | extern int param_get_int(char *buffer, struct kernel_param *kp); | |
124 | #define param_check_int(name, p) __param_check(name, p, int) | |
125 | ||
126 | extern int param_set_uint(const char *val, struct kernel_param *kp); | |
127 | extern int param_get_uint(char *buffer, struct kernel_param *kp); | |
128 | #define param_check_uint(name, p) __param_check(name, p, unsigned int) | |
129 | ||
130 | extern int param_set_long(const char *val, struct kernel_param *kp); | |
131 | extern int param_get_long(char *buffer, struct kernel_param *kp); | |
132 | #define param_check_long(name, p) __param_check(name, p, long) | |
133 | ||
134 | extern int param_set_ulong(const char *val, struct kernel_param *kp); | |
135 | extern int param_get_ulong(char *buffer, struct kernel_param *kp); | |
136 | #define param_check_ulong(name, p) __param_check(name, p, unsigned long) | |
137 | ||
138 | extern int param_set_charp(const char *val, struct kernel_param *kp); | |
139 | extern int param_get_charp(char *buffer, struct kernel_param *kp); | |
140 | #define param_check_charp(name, p) __param_check(name, p, char *) | |
141 | ||
142 | extern int param_set_bool(const char *val, struct kernel_param *kp); | |
143 | extern int param_get_bool(char *buffer, struct kernel_param *kp); | |
144 | #define param_check_bool(name, p) __param_check(name, p, int) | |
145 | ||
146 | extern int param_set_invbool(const char *val, struct kernel_param *kp); | |
147 | extern int param_get_invbool(char *buffer, struct kernel_param *kp); | |
148 | #define param_check_invbool(name, p) __param_check(name, p, int) | |
149 | ||
150 | /* Comma-separated array: *nump is set to number they actually specified. */ | |
151 | #define module_param_array_named(name, array, type, nump, perm) \ | |
152 | static struct kparam_array __param_arr_##name \ | |
153 | = { ARRAY_SIZE(array), nump, param_set_##type, param_get_##type,\ | |
154 | sizeof(array[0]), array }; \ | |
155 | module_param_call(name, param_array_set, param_array_get, \ | |
156 | &__param_arr_##name, perm); \ | |
157 | __MODULE_PARM_TYPE(name, "array of " #type) | |
158 | ||
159 | #define module_param_array(name, type, nump, perm) \ | |
160 | module_param_array_named(name, name, type, nump, perm) | |
161 | ||
162 | extern int param_array_set(const char *val, struct kernel_param *kp); | |
163 | extern int param_array_get(char *buffer, struct kernel_param *kp); | |
164 | ||
165 | extern int param_set_copystring(const char *val, struct kernel_param *kp); | |
166 | extern int param_get_string(char *buffer, struct kernel_param *kp); | |
167 | ||
1da177e4 LT |
168 | /* for exporting parameters in /sys/parameters */ |
169 | ||
170 | struct module; | |
171 | ||
ef665c1a | 172 | #if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES) |
1da177e4 LT |
173 | extern int module_param_sysfs_setup(struct module *mod, |
174 | struct kernel_param *kparam, | |
175 | unsigned int num_params); | |
176 | ||
177 | extern void module_param_sysfs_remove(struct module *mod); | |
ef665c1a RD |
178 | #else |
179 | static inline int module_param_sysfs_setup(struct module *mod, | |
180 | struct kernel_param *kparam, | |
181 | unsigned int num_params) | |
182 | { | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static inline void module_param_sysfs_remove(struct module *mod) | |
187 | { } | |
188 | #endif | |
1da177e4 LT |
189 | |
190 | #endif /* _LINUX_MODULE_PARAMS_H */ |