projects/linux·blob v2.6.22-rc7 · refs

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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
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) \
20static 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
29struct kernel_param;
30
31/* Returns 0, or -errno. arg is in kp->arg. */
32typedef int (*param_set_fn)(const char *val, struct kernel_param *kp);
33/* Returns length written or -errno. Buffer is 4k (ie. be short!) */
34typedef int (*param_get_fn)(char *buffer, struct kernel_param *kp);
35
36struct 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 */
45struct kparam_string {
46 unsigned int maxlen;
47 char *string;
48};
49
50/* Special one for arrays */
51struct 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
62 parameters. perm sets the visibility in sysfs: 000 means it's
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) \
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)); \
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 */
98extern 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
110extern int param_set_byte(const char *val, struct kernel_param *kp);
111extern int param_get_byte(char *buffer, struct kernel_param *kp);
112#define param_check_byte(name, p) __param_check(name, p, unsigned char)
113
114extern int param_set_short(const char *val, struct kernel_param *kp);
115extern int param_get_short(char *buffer, struct kernel_param *kp);
116#define param_check_short(name, p) __param_check(name, p, short)
117
118extern int param_set_ushort(const char *val, struct kernel_param *kp);
119extern int param_get_ushort(char *buffer, struct kernel_param *kp);
120#define param_check_ushort(name, p) __param_check(name, p, unsigned short)
121
122extern int param_set_int(const char *val, struct kernel_param *kp);
123extern int param_get_int(char *buffer, struct kernel_param *kp);
124#define param_check_int(name, p) __param_check(name, p, int)
125
126extern int param_set_uint(const char *val, struct kernel_param *kp);
127extern int param_get_uint(char *buffer, struct kernel_param *kp);
128#define param_check_uint(name, p) __param_check(name, p, unsigned int)
129
130extern int param_set_long(const char *val, struct kernel_param *kp);
131extern int param_get_long(char *buffer, struct kernel_param *kp);
132#define param_check_long(name, p) __param_check(name, p, long)
133
134extern int param_set_ulong(const char *val, struct kernel_param *kp);
135extern int param_get_ulong(char *buffer, struct kernel_param *kp);
136#define param_check_ulong(name, p) __param_check(name, p, unsigned long)
137
138extern int param_set_charp(const char *val, struct kernel_param *kp);
139extern int param_get_charp(char *buffer, struct kernel_param *kp);
140#define param_check_charp(name, p) __param_check(name, p, char *)
141
142extern int param_set_bool(const char *val, struct kernel_param *kp);
143extern int param_get_bool(char *buffer, struct kernel_param *kp);
144#define param_check_bool(name, p) __param_check(name, p, int)
145
146extern int param_set_invbool(const char *val, struct kernel_param *kp);
147extern 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
162extern int param_array_set(const char *val, struct kernel_param *kp);
163extern int param_array_get(char *buffer, struct kernel_param *kp);
164
165extern int param_set_copystring(const char *val, struct kernel_param *kp);
166extern int param_get_string(char *buffer, struct kernel_param *kp);
167
168/* for exporting parameters in /sys/parameters */
169
170struct module;
171
172#if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES)
173extern int module_param_sysfs_setup(struct module *mod,
174 struct kernel_param *kparam,
175 unsigned int num_params);
176
177extern void module_param_sysfs_remove(struct module *mod);
178#else
179static 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
186static inline void module_param_sysfs_remove(struct module *mod)
187{ }
188#endif
189
190#endif /* _LINUX_MODULE_PARAMS_H */