moduleparam.h
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上传日期:2009-04-28
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- #ifndef _LINUX_MODULE_PARAMS_H
- #define _LINUX_MODULE_PARAMS_H
- /* (C) Copyright 2001, 2002 Rusty Russell IBM Corporation */
- #include <linux/init.h>
- #include <linux/stringify.h>
- #include <linux/kernel.h>
- /* You can override this manually, but generally this should match the
- module name. */
- #ifdef MODULE
- #define MODULE_PARAM_PREFIX /* empty */
- #else
- #define MODULE_PARAM_PREFIX __stringify(KBUILD_MODNAME) "."
- #endif
- #ifdef MODULE
- #define ___module_cat(a,b) __mod_ ## a ## b
- #define __module_cat(a,b) ___module_cat(a,b)
- #define __MODULE_INFO(tag, name, info)
- static const char __module_cat(name,__LINE__)[]
- __attribute_used__
- __attribute__((section(".modinfo"),unused)) = __stringify(tag) "=" info
- #else /* !MODULE */
- #define __MODULE_INFO(tag, name, info)
- #endif
- #define __MODULE_PARM_TYPE(name, _type)
- __MODULE_INFO(parmtype, name##type, #name ":" _type)
- struct kernel_param;
- /* Returns 0, or -errno. arg is in kp->arg. */
- typedef int (*param_set_fn)(const char *val, struct kernel_param *kp);
- /* Returns length written or -errno. Buffer is 4k (ie. be short!) */
- typedef int (*param_get_fn)(char *buffer, struct kernel_param *kp);
- struct kernel_param {
- const char *name;
- unsigned int perm;
- param_set_fn set;
- param_get_fn get;
- void *arg;
- };
- /* Special one for strings we want to copy into */
- struct kparam_string {
- unsigned int maxlen;
- char *string;
- };
- /* Special one for arrays */
- struct kparam_array
- {
- unsigned int max;
- unsigned int *num;
- param_set_fn set;
- param_get_fn get;
- unsigned int elemsize;
- void *elem;
- };
- /* This is the fundamental function for registering boot/module
- parameters. perm sets the visibility in driverfs: 000 means it's
- not there, read bits mean it's readable, write bits mean it's
- writable. */
- #define __module_param_call(prefix, name, set, get, arg, perm)
- static char __param_str_##name[] = prefix #name;
- static struct kernel_param const __param_##name
- __attribute_used__
- __attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *))))
- = { __param_str_##name, perm, set, get, arg }
- #define module_param_call(name, set, get, arg, perm)
- __module_param_call(MODULE_PARAM_PREFIX, name, set, get, arg, perm)
- /* Helper functions: type is byte, short, ushort, int, uint, long,
- ulong, charp, bool or invbool, or XXX if you define param_get_XXX,
- param_set_XXX and param_check_XXX. */
- #define module_param_named(name, value, type, perm)
- param_check_##type(name, &(value));
- module_param_call(name, param_set_##type, param_get_##type, &value, perm);
- __MODULE_PARM_TYPE(name, #type)
- #define module_param(name, type, perm)
- module_param_named(name, name, type, perm)
- /* Actually copy string: maxlen param is usually sizeof(string). */
- #define module_param_string(name, string, len, perm)
- static struct kparam_string __param_string_##name
- = { len, string };
- module_param_call(name, param_set_copystring, param_get_string,
- &__param_string_##name, perm);
- __MODULE_PARM_TYPE(name, "string")
- /* Called on module insert or kernel boot */
- extern int parse_args(const char *name,
- char *args,
- struct kernel_param *params,
- unsigned num,
- int (*unknown)(char *param, char *val));
- /* All the helper functions */
- /* The macros to do compile-time type checking stolen from Jakub
- Jelinek, who IIRC came up with this idea for the 2.4 module init code. */
- #define __param_check(name, p, type)
- static inline type *__check_##name(void) { return(p); }
- extern int param_set_byte(const char *val, struct kernel_param *kp);
- extern int param_get_byte(char *buffer, struct kernel_param *kp);
- #define param_check_byte(name, p) __param_check(name, p, unsigned char)
- extern int param_set_short(const char *val, struct kernel_param *kp);
- extern int param_get_short(char *buffer, struct kernel_param *kp);
- #define param_check_short(name, p) __param_check(name, p, short)
- extern int param_set_ushort(const char *val, struct kernel_param *kp);
- extern int param_get_ushort(char *buffer, struct kernel_param *kp);
- #define param_check_ushort(name, p) __param_check(name, p, unsigned short)
- extern int param_set_int(const char *val, struct kernel_param *kp);
- extern int param_get_int(char *buffer, struct kernel_param *kp);
- #define param_check_int(name, p) __param_check(name, p, int)
- extern int param_set_uint(const char *val, struct kernel_param *kp);
- extern int param_get_uint(char *buffer, struct kernel_param *kp);
- #define param_check_uint(name, p) __param_check(name, p, unsigned int)
- extern int param_set_long(const char *val, struct kernel_param *kp);
- extern int param_get_long(char *buffer, struct kernel_param *kp);
- #define param_check_long(name, p) __param_check(name, p, long)
- extern int param_set_ulong(const char *val, struct kernel_param *kp);
- extern int param_get_ulong(char *buffer, struct kernel_param *kp);
- #define param_check_ulong(name, p) __param_check(name, p, unsigned long)
- extern int param_set_charp(const char *val, struct kernel_param *kp);
- extern int param_get_charp(char *buffer, struct kernel_param *kp);
- #define param_check_charp(name, p) __param_check(name, p, char *)
- extern int param_set_bool(const char *val, struct kernel_param *kp);
- extern int param_get_bool(char *buffer, struct kernel_param *kp);
- #define param_check_bool(name, p) __param_check(name, p, int)
- extern int param_set_invbool(const char *val, struct kernel_param *kp);
- extern int param_get_invbool(char *buffer, struct kernel_param *kp);
- #define param_check_invbool(name, p) __param_check(name, p, int)
- /* Comma-separated array: *nump is set to number they actually specified. */
- #define module_param_array_named(name, array, type, nump, perm)
- static struct kparam_array __param_arr_##name
- = { ARRAY_SIZE(array), nump, param_set_##type, param_get_##type,
- sizeof(array[0]), array };
- module_param_call(name, param_array_set, param_array_get,
- &__param_arr_##name, perm);
- __MODULE_PARM_TYPE(name, "array of " #type)
- #define module_param_array(name, type, nump, perm)
- module_param_array_named(name, name, type, nump, perm)
- extern int param_array_set(const char *val, struct kernel_param *kp);
- extern int param_array_get(char *buffer, struct kernel_param *kp);
- extern int param_set_copystring(const char *val, struct kernel_param *kp);
- extern int param_get_string(char *buffer, struct kernel_param *kp);
- int param_array(const char *name,
- const char *val,
- unsigned int min, unsigned int max,
- void *elem, int elemsize,
- int (*set)(const char *, struct kernel_param *kp),
- int *num);
- /* for exporting parameters in /sys/parameters */
- struct module;
- extern int module_param_sysfs_setup(struct module *mod,
- struct kernel_param *kparam,
- unsigned int num_params);
- extern void module_param_sysfs_remove(struct module *mod);
- #endif /* _LINUX_MODULE_PARAMS_H */