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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 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 */