linux/include/linux/moduleparam.h
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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/* Chosen so that structs with an unsigned long line up. */
  17#define MAX_PARAM_PREFIX_LEN (64 - sizeof(unsigned long))
  18
  19#ifdef MODULE
  20#define ___module_cat(a,b) __mod_ ## a ## b
  21#define __module_cat(a,b) ___module_cat(a,b)
  22#define __MODULE_INFO(tag, name, info)                                    \
  23static const char __module_cat(name,__LINE__)[]                           \
  24  __used                                                                  \
  25  __attribute__((section(".modinfo"),unused)) = __stringify(tag) "=" info
  26#else  /* !MODULE */
  27#define __MODULE_INFO(tag, name, info)
  28#endif
  29#define __MODULE_PARM_TYPE(name, _type)                                   \
  30  __MODULE_INFO(parmtype, name##type, #name ":" _type)
  31
  32struct kernel_param;
  33
  34/* Returns 0, or -errno.  arg is in kp->arg. */
  35typedef int (*param_set_fn)(const char *val, struct kernel_param *kp);
  36/* Returns length written or -errno.  Buffer is 4k (ie. be short!) */
  37typedef int (*param_get_fn)(char *buffer, struct kernel_param *kp);
  38
  39/* Flag bits for kernel_param.flags */
  40#define KPARAM_ISBOOL           2
  41
  42struct kernel_param {
  43        const char *name;
  44        u16 perm;
  45        u16 flags;
  46        param_set_fn set;
  47        param_get_fn get;
  48        union {
  49                void *arg;
  50                const struct kparam_string *str;
  51                const struct kparam_array *arr;
  52        };
  53};
  54
  55/* Special one for strings we want to copy into */
  56struct kparam_string {
  57        unsigned int maxlen;
  58        char *string;
  59};
  60
  61/* Special one for arrays */
  62struct kparam_array
  63{
  64        unsigned int max;
  65        unsigned int *num;
  66        param_set_fn set;
  67        param_get_fn get;
  68        unsigned int elemsize;
  69        void *elem;
  70};
  71
  72/* On alpha, ia64 and ppc64 relocations to global data cannot go into
  73   read-only sections (which is part of respective UNIX ABI on these
  74   platforms). So 'const' makes no sense and even causes compile failures
  75   with some compilers. */
  76#if defined(CONFIG_ALPHA) || defined(CONFIG_IA64) || defined(CONFIG_PPC64)
  77#define __moduleparam_const
  78#else
  79#define __moduleparam_const const
  80#endif
  81
  82/* This is the fundamental function for registering boot/module
  83   parameters.  perm sets the visibility in sysfs: 000 means it's
  84   not there, read bits mean it's readable, write bits mean it's
  85   writable. */
  86#define __module_param_call(prefix, name, set, get, arg, isbool, perm)  \
  87        /* Default value instead of permissions? */                     \
  88        static int __param_perm_check_##name __attribute__((unused)) =  \
  89        BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2))  \
  90        + BUILD_BUG_ON_ZERO(sizeof(""prefix) > MAX_PARAM_PREFIX_LEN);   \
  91        static const char __param_str_##name[] = prefix #name;          \
  92        static struct kernel_param __moduleparam_const __param_##name   \
  93        __used                                                          \
  94    __attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) \
  95        = { __param_str_##name, perm, isbool ? KPARAM_ISBOOL : 0,       \
  96            set, get, { arg } }
  97
  98#define module_param_call(name, set, get, arg, perm)                          \
  99        __module_param_call(MODULE_PARAM_PREFIX,                              \
 100                            name, set, get, arg,                              \
 101                            __same_type(*(arg), bool), perm)
 102
 103/* Helper functions: type is byte, short, ushort, int, uint, long,
 104   ulong, charp, bool or invbool, or XXX if you define param_get_XXX,
 105   param_set_XXX and param_check_XXX. */
 106#define module_param_named(name, value, type, perm)                        \
 107        param_check_##type(name, &(value));                                \
 108        module_param_call(name, param_set_##type, param_get_##type, &value, perm); \
 109        __MODULE_PARM_TYPE(name, #type)
 110
 111#define module_param(name, type, perm)                          \
 112        module_param_named(name, name, type, perm)
 113
 114#ifndef MODULE
 115/**
 116 * core_param - define a historical core kernel parameter.
 117 * @name: the name of the cmdline and sysfs parameter (often the same as var)
 118 * @var: the variable
 119 * @type: the type (for param_set_##type and param_get_##type)
 120 * @perm: visibility in sysfs
 121 *
 122 * core_param is just like module_param(), but cannot be modular and
 123 * doesn't add a prefix (such as "printk.").  This is for compatibility
 124 * with __setup(), and it makes sense as truly core parameters aren't
 125 * tied to the particular file they're in.
 126 */
 127#define core_param(name, var, type, perm)                               \
 128        param_check_##type(name, &(var));                               \
 129        __module_param_call("", name, param_set_##type, param_get_##type, \
 130                            &var, __same_type(var, bool), perm)
 131#endif /* !MODULE */
 132
 133/* Actually copy string: maxlen param is usually sizeof(string). */
 134#define module_param_string(name, string, len, perm)                    \
 135        static const struct kparam_string __param_string_##name         \
 136                = { len, string };                                      \
 137        __module_param_call(MODULE_PARAM_PREFIX, name,                  \
 138                            param_set_copystring, param_get_string,     \
 139                            .str = &__param_string_##name, 0, perm);    \
 140        __MODULE_PARM_TYPE(name, "string")
 141
 142/* Called on module insert or kernel boot */
 143extern int parse_args(const char *name,
 144                      char *args,
 145                      struct kernel_param *params,
 146                      unsigned num,
 147                      int (*unknown)(char *param, char *val));
 148
 149/* Called by module remove. */
 150#ifdef CONFIG_SYSFS
 151extern void destroy_params(const struct kernel_param *params, unsigned num);
 152#else
 153static inline void destroy_params(const struct kernel_param *params,
 154                                  unsigned num)
 155{
 156}
 157#endif /* !CONFIG_SYSFS */
 158
 159/* All the helper functions */
 160/* The macros to do compile-time type checking stolen from Jakub
 161   Jelinek, who IIRC came up with this idea for the 2.4 module init code. */
 162#define __param_check(name, p, type) \
 163        static inline type *__check_##name(void) { return(p); }
 164
 165extern int param_set_byte(const char *val, struct kernel_param *kp);
 166extern int param_get_byte(char *buffer, struct kernel_param *kp);
 167#define param_check_byte(name, p) __param_check(name, p, unsigned char)
 168
 169extern int param_set_short(const char *val, struct kernel_param *kp);
 170extern int param_get_short(char *buffer, struct kernel_param *kp);
 171#define param_check_short(name, p) __param_check(name, p, short)
 172
 173extern int param_set_ushort(const char *val, struct kernel_param *kp);
 174extern int param_get_ushort(char *buffer, struct kernel_param *kp);
 175#define param_check_ushort(name, p) __param_check(name, p, unsigned short)
 176
 177extern int param_set_int(const char *val, struct kernel_param *kp);
 178extern int param_get_int(char *buffer, struct kernel_param *kp);
 179#define param_check_int(name, p) __param_check(name, p, int)
 180
 181extern int param_set_uint(const char *val, struct kernel_param *kp);
 182extern int param_get_uint(char *buffer, struct kernel_param *kp);
 183#define param_check_uint(name, p) __param_check(name, p, unsigned int)
 184
 185extern int param_set_long(const char *val, struct kernel_param *kp);
 186extern int param_get_long(char *buffer, struct kernel_param *kp);
 187#define param_check_long(name, p) __param_check(name, p, long)
 188
 189extern int param_set_ulong(const char *val, struct kernel_param *kp);
 190extern int param_get_ulong(char *buffer, struct kernel_param *kp);
 191#define param_check_ulong(name, p) __param_check(name, p, unsigned long)
 192
 193extern int param_set_charp(const char *val, struct kernel_param *kp);
 194extern int param_get_charp(char *buffer, struct kernel_param *kp);
 195#define param_check_charp(name, p) __param_check(name, p, char *)
 196
 197/* For historical reasons "bool" parameters can be (unsigned) "int". */
 198extern int param_set_bool(const char *val, struct kernel_param *kp);
 199extern int param_get_bool(char *buffer, struct kernel_param *kp);
 200#define param_check_bool(name, p)                                       \
 201        static inline void __check_##name(void)                         \
 202        {                                                               \
 203                BUILD_BUG_ON(!__same_type(*(p), bool) &&                \
 204                             !__same_type(*(p), unsigned int) &&        \
 205                             !__same_type(*(p), int));                  \
 206        }
 207
 208extern int param_set_invbool(const char *val, struct kernel_param *kp);
 209extern int param_get_invbool(char *buffer, struct kernel_param *kp);
 210#define param_check_invbool(name, p) __param_check(name, p, bool)
 211
 212/* Comma-separated array: *nump is set to number they actually specified. */
 213#define module_param_array_named(name, array, type, nump, perm)         \
 214        static const struct kparam_array __param_arr_##name             \
 215        = { ARRAY_SIZE(array), nump, param_set_##type, param_get_##type,\
 216            sizeof(array[0]), array };                                  \
 217        __module_param_call(MODULE_PARAM_PREFIX, name,                  \
 218                            param_array_set, param_array_get,           \
 219                            .arr = &__param_arr_##name,                 \
 220                            __same_type(array[0], bool), perm);         \
 221        __MODULE_PARM_TYPE(name, "array of " #type)
 222
 223#define module_param_array(name, type, nump, perm)              \
 224        module_param_array_named(name, name, type, nump, perm)
 225
 226extern int param_array_set(const char *val, struct kernel_param *kp);
 227extern int param_array_get(char *buffer, struct kernel_param *kp);
 228
 229extern int param_set_copystring(const char *val, struct kernel_param *kp);
 230extern int param_get_string(char *buffer, struct kernel_param *kp);
 231
 232/* for exporting parameters in /sys/parameters */
 233
 234struct module;
 235
 236#if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES)
 237extern int module_param_sysfs_setup(struct module *mod,
 238                                    struct kernel_param *kparam,
 239                                    unsigned int num_params);
 240
 241extern void module_param_sysfs_remove(struct module *mod);
 242#else
 243static inline int module_param_sysfs_setup(struct module *mod,
 244                             struct kernel_param *kparam,
 245                             unsigned int num_params)
 246{
 247        return 0;
 248}
 249
 250static inline void module_param_sysfs_remove(struct module *mod)
 251{ }
 252#endif
 253
 254#endif /* _LINUX_MODULE_PARAMS_H */
 255
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