179 lines
6.8 KiB
C
179 lines
6.8 KiB
C
#ifndef _LINUX_MODULE_PARAMS_H
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#define _LINUX_MODULE_PARAMS_H
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/* (C) Copyright 2001, 2002 Rusty Russell IBM Corporation */
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#include <linux/init.h>
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#include <linux/stringify.h>
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#include <linux/kernel.h>
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/* You can override this manually, but generally this should match the
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module name. */
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#ifdef MODULE
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#define MODULE_PARAM_PREFIX /* empty */
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#else
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#define MODULE_PARAM_PREFIX KBUILD_MODNAME "."
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#endif
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#ifdef MODULE
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#define ___module_cat(a,b) __mod_ ## a ## b
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#define __module_cat(a,b) ___module_cat(a,b)
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#define __MODULE_INFO(tag, name, info) \
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static const char __module_cat(name,__LINE__)[] \
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__attribute_used__ \
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__attribute__((section(".modinfo"),unused)) = __stringify(tag) "=" info
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#else /* !MODULE */
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#define __MODULE_INFO(tag, name, info)
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#endif
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#define __MODULE_PARM_TYPE(name, _type) \
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__MODULE_INFO(parmtype, name##type, #name ":" _type)
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struct kernel_param;
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/* Returns 0, or -errno. arg is in kp->arg. */
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typedef int (*param_set_fn)(const char *val, struct kernel_param *kp);
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/* Returns length written or -errno. Buffer is 4k (ie. be short!) */
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typedef int (*param_get_fn)(char *buffer, struct kernel_param *kp);
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struct kernel_param {
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const char *name;
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unsigned int perm;
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param_set_fn set;
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param_get_fn get;
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void *arg;
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};
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/* Special one for strings we want to copy into */
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struct kparam_string {
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unsigned int maxlen;
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char *string;
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};
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/* Special one for arrays */
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struct kparam_array
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{
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unsigned int max;
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unsigned int *num;
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param_set_fn set;
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param_get_fn get;
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unsigned int elemsize;
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void *elem;
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};
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/* This is the fundamental function for registering boot/module
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parameters. perm sets the visibility in driverfs: 000 means it's
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not there, read bits mean it's readable, write bits mean it's
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writable. */
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#define __module_param_call(prefix, name, set, get, arg, perm) \
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/* Default value instead of permissions? */ \
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static int __param_perm_check_##name __attribute__((unused)) = \
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BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)); \
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static char __param_str_##name[] = prefix #name; \
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static struct kernel_param const __param_##name \
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__attribute_used__ \
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__attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) \
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= { __param_str_##name, perm, set, get, arg }
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#define module_param_call(name, set, get, arg, perm) \
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__module_param_call(MODULE_PARAM_PREFIX, name, set, get, arg, perm)
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/* Helper functions: type is byte, short, ushort, int, uint, long,
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ulong, charp, bool or invbool, or XXX if you define param_get_XXX,
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param_set_XXX and param_check_XXX. */
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#define module_param_named(name, value, type, perm) \
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param_check_##type(name, &(value)); \
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module_param_call(name, param_set_##type, param_get_##type, &value, perm); \
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__MODULE_PARM_TYPE(name, #type)
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#define module_param(name, type, perm) \
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module_param_named(name, name, type, perm)
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/* Actually copy string: maxlen param is usually sizeof(string). */
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#define module_param_string(name, string, len, perm) \
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static struct kparam_string __param_string_##name \
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= { len, string }; \
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module_param_call(name, param_set_copystring, param_get_string, \
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&__param_string_##name, perm); \
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__MODULE_PARM_TYPE(name, "string")
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/* Called on module insert or kernel boot */
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extern int parse_args(const char *name,
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char *args,
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struct kernel_param *params,
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unsigned num,
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int (*unknown)(char *param, char *val));
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/* All the helper functions */
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/* The macros to do compile-time type checking stolen from Jakub
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Jelinek, who IIRC came up with this idea for the 2.4 module init code. */
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#define __param_check(name, p, type) \
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static inline type *__check_##name(void) { return(p); }
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extern int param_set_byte(const char *val, struct kernel_param *kp);
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extern int param_get_byte(char *buffer, struct kernel_param *kp);
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#define param_check_byte(name, p) __param_check(name, p, unsigned char)
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extern int param_set_short(const char *val, struct kernel_param *kp);
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extern int param_get_short(char *buffer, struct kernel_param *kp);
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#define param_check_short(name, p) __param_check(name, p, short)
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extern int param_set_ushort(const char *val, struct kernel_param *kp);
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extern int param_get_ushort(char *buffer, struct kernel_param *kp);
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#define param_check_ushort(name, p) __param_check(name, p, unsigned short)
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extern int param_set_int(const char *val, struct kernel_param *kp);
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extern int param_get_int(char *buffer, struct kernel_param *kp);
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#define param_check_int(name, p) __param_check(name, p, int)
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extern int param_set_uint(const char *val, struct kernel_param *kp);
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extern int param_get_uint(char *buffer, struct kernel_param *kp);
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#define param_check_uint(name, p) __param_check(name, p, unsigned int)
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extern int param_set_long(const char *val, struct kernel_param *kp);
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extern int param_get_long(char *buffer, struct kernel_param *kp);
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#define param_check_long(name, p) __param_check(name, p, long)
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extern int param_set_ulong(const char *val, struct kernel_param *kp);
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extern int param_get_ulong(char *buffer, struct kernel_param *kp);
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#define param_check_ulong(name, p) __param_check(name, p, unsigned long)
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extern int param_set_charp(const char *val, struct kernel_param *kp);
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extern int param_get_charp(char *buffer, struct kernel_param *kp);
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#define param_check_charp(name, p) __param_check(name, p, char *)
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extern int param_set_bool(const char *val, struct kernel_param *kp);
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extern int param_get_bool(char *buffer, struct kernel_param *kp);
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#define param_check_bool(name, p) __param_check(name, p, int)
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extern int param_set_invbool(const char *val, struct kernel_param *kp);
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extern int param_get_invbool(char *buffer, struct kernel_param *kp);
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#define param_check_invbool(name, p) __param_check(name, p, int)
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/* Comma-separated array: *nump is set to number they actually specified. */
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#define module_param_array_named(name, array, type, nump, perm) \
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static struct kparam_array __param_arr_##name \
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= { ARRAY_SIZE(array), nump, param_set_##type, param_get_##type,\
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sizeof(array[0]), array }; \
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module_param_call(name, param_array_set, param_array_get, \
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&__param_arr_##name, perm); \
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__MODULE_PARM_TYPE(name, "array of " #type)
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#define module_param_array(name, type, nump, perm) \
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module_param_array_named(name, name, type, nump, perm)
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extern int param_array_set(const char *val, struct kernel_param *kp);
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extern int param_array_get(char *buffer, struct kernel_param *kp);
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extern int param_set_copystring(const char *val, struct kernel_param *kp);
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extern int param_get_string(char *buffer, struct kernel_param *kp);
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/* for exporting parameters in /sys/parameters */
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struct module;
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extern int module_param_sysfs_setup(struct module *mod,
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struct kernel_param *kparam,
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unsigned int num_params);
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extern void module_param_sysfs_remove(struct module *mod);
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#endif /* _LINUX_MODULE_PARAMS_H */
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