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
13 #define MODULE_PARAM_PREFIX KBUILD_MODNAME "."
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 __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 union {
42 void *arg;
43 const struct kparam_string *str;
44 const struct kparam_array *arr;
45 };
46 };
47
48 /* Special one for strings we want to copy into */
49 struct kparam_string {
50 unsigned int maxlen;
51 char *string;
52 };
53
54 /* Special one for arrays */
55 struct kparam_array
56 {
57 unsigned int max;
58 unsigned int *num;
59 param_set_fn set;
60 param_get_fn get;
61 unsigned int elemsize;
62 void *elem;
63 };
64
65 /* On alpha, ia64 and ppc64 relocations to global data cannot go into
66 read-only sections (which is part of respective UNIX ABI on these
67 platforms). So 'const' makes no sense and even causes compile failures
68 with some compilers. */
69 #if defined(CONFIG_ALPHA) || defined(CONFIG_IA64) || defined(CONFIG_PPC64)
70 #define __moduleparam_const
71 #else
72 #define __moduleparam_const const
73 #endif
74
75 /* This is the fundamental function for registering boot/module
76 parameters. perm sets the visibility in sysfs: 000 means it's
77 not there, read bits mean it's readable, write bits mean it's
78 writable. */
79 #define __module_param_call(prefix, name, set, get, arg, perm) \
80 /* Default value instead of permissions? */ \
81 static int __param_perm_check_##name __attribute__((unused)) = \
82 BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)); \
83 static const char __param_str_##name[] = prefix #name; \
84 static struct kernel_param __moduleparam_const __param_##name \
85 __used \
86 __attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) \
87 = { __param_str_##name, perm, set, get, { arg } }
88
89 #define module_param_call(name, set, get, arg, perm) \
90 __module_param_call(MODULE_PARAM_PREFIX, name, set, get, arg, perm)
91
92 /* Helper functions: type is byte, short, ushort, int, uint, long,
93 ulong, charp, bool or invbool, or XXX if you define param_get_XXX,
94 param_set_XXX and param_check_XXX. */
95 #define module_param_named(name, value, type, perm) \
96 param_check_##type(name, &(value)); \
97 module_param_call(name, param_set_##type, param_get_##type, &value, perm); \
98 __MODULE_PARM_TYPE(name, #type)
99
100 #define module_param(name, type, perm) \
101 module_param_named(name, name, type, perm)
102
103 /* Actually copy string: maxlen param is usually sizeof(string). */
104 #define module_param_string(name, string, len, perm) \
105 static const struct kparam_string __param_string_##name \
106 = { len, string }; \
107 module_param_call(name, param_set_copystring, param_get_string, \
108 .str = &__param_string_##name, perm); \
109 __MODULE_PARM_TYPE(name, "string")
110
111 /* Called on module insert or kernel boot */
112 extern int parse_args(const char *name,
113 char *args,
114 struct kernel_param *params,
115 unsigned num,
116 int (*unknown)(char *param, char *val));
117
118 /* All the helper functions */
119 /* The macros to do compile-time type checking stolen from Jakub
120 Jelinek, who IIRC came up with this idea for the 2.4 module init code. */
121 #define __param_check(name, p, type) \
122 static inline type *__check_##name(void) { return(p); }
123
124 extern int param_set_byte(const char *val, struct kernel_param *kp);
125 extern int param_get_byte(char *buffer, struct kernel_param *kp);
126 #define param_check_byte(name, p) __param_check(name, p, unsigned char)
127
128 extern int param_set_short(const char *val, struct kernel_param *kp);
129 extern int param_get_short(char *buffer, struct kernel_param *kp);
130 #define param_check_short(name, p) __param_check(name, p, short)
131
132 extern int param_set_ushort(const char *val, struct kernel_param *kp);
133 extern int param_get_ushort(char *buffer, struct kernel_param *kp);
134 #define param_check_ushort(name, p) __param_check(name, p, unsigned short)
135
136 extern int param_set_int(const char *val, struct kernel_param *kp);
137 extern int param_get_int(char *buffer, struct kernel_param *kp);
138 #define param_check_int(name, p) __param_check(name, p, int)
139
140 extern int param_set_uint(const char *val, struct kernel_param *kp);
141 extern int param_get_uint(char *buffer, struct kernel_param *kp);
142 #define param_check_uint(name, p) __param_check(name, p, unsigned int)
143
144 extern int param_set_long(const char *val, struct kernel_param *kp);
145 extern int param_get_long(char *buffer, struct kernel_param *kp);
146 #define param_check_long(name, p) __param_check(name, p, long)
147
148 extern int param_set_ulong(const char *val, struct kernel_param *kp);
149 extern int param_get_ulong(char *buffer, struct kernel_param *kp);
150 #define param_check_ulong(name, p) __param_check(name, p, unsigned long)
151
152 extern int param_set_charp(const char *val, struct kernel_param *kp);
153 extern int param_get_charp(char *buffer, struct kernel_param *kp);
154 #define param_check_charp(name, p) __param_check(name, p, char *)
155
156 extern int param_set_bool(const char *val, struct kernel_param *kp);
157 extern int param_get_bool(char *buffer, struct kernel_param *kp);
158 #define param_check_bool(name, p) __param_check(name, p, int)
159
160 extern int param_set_invbool(const char *val, struct kernel_param *kp);
161 extern int param_get_invbool(char *buffer, struct kernel_param *kp);
162 #define param_check_invbool(name, p) __param_check(name, p, int)
163
164 /* Comma-separated array: *nump is set to number they actually specified. */
165 #define module_param_array_named(name, array, type, nump, perm) \
166 static const struct kparam_array __param_arr_##name \
167 = { ARRAY_SIZE(array), nump, param_set_##type, param_get_##type,\
168 sizeof(array[0]), array }; \
169 module_param_call(name, param_array_set, param_array_get, \
170 .arr = &__param_arr_##name, perm); \
171 __MODULE_PARM_TYPE(name, "array of " #type)
172
173 #define module_param_array(name, type, nump, perm) \
174 module_param_array_named(name, name, type, nump, perm)
175
176 extern int param_array_set(const char *val, struct kernel_param *kp);
177 extern int param_array_get(char *buffer, struct kernel_param *kp);
178
179 extern int param_set_copystring(const char *val, struct kernel_param *kp);
180 extern int param_get_string(char *buffer, struct kernel_param *kp);
181
182 /* for exporting parameters in /sys/parameters */
183
184 struct module;
185
186 #if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES)
187 extern int module_param_sysfs_setup(struct module *mod,
188 struct kernel_param *kparam,
189 unsigned int num_params);
190
191 extern void module_param_sysfs_remove(struct module *mod);
192 #else
193 static inline int module_param_sysfs_setup(struct module *mod,
194 struct kernel_param *kparam,
195 unsigned int num_params)
196 {
197 return 0;
198 }
199
200 static inline void module_param_sysfs_remove(struct module *mod)
201 { }
202 #endif
203
204 #endif /* _LINUX_MODULE_PARAMS_H */
205
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