mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 16:38:31 +00:00
67e67ceaac
There are a lot of one-liner uses of __setup() in the kernel: they're cumbersome and not queryable (definitely not settable) via /sys. Yet it's ugly to simplify them to module_param(), because by default that inserts a prefix of the module name (usually filename). So, introduce a "core_param". The parameter gets no prefix, but appears in /sys/module/kernel/parameters/ (if non-zero perms arg). I thought about using the name "core", but that's more common than "kernel". And if you create a module called "kernel", you will die a horrible death. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
228 lines
8.4 KiB
C
228 lines
8.4 KiB
C
#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
|
|
|
|
/* Chosen so that structs with an unsigned long line up. */
|
|
#define MAX_PARAM_PREFIX_LEN (64 - sizeof(unsigned long))
|
|
|
|
#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__)[] \
|
|
__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;
|
|
union {
|
|
void *arg;
|
|
const struct kparam_string *str;
|
|
const struct kparam_array *arr;
|
|
};
|
|
};
|
|
|
|
/* 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;
|
|
};
|
|
|
|
/* On alpha, ia64 and ppc64 relocations to global data cannot go into
|
|
read-only sections (which is part of respective UNIX ABI on these
|
|
platforms). So 'const' makes no sense and even causes compile failures
|
|
with some compilers. */
|
|
#if defined(CONFIG_ALPHA) || defined(CONFIG_IA64) || defined(CONFIG_PPC64)
|
|
#define __moduleparam_const
|
|
#else
|
|
#define __moduleparam_const const
|
|
#endif
|
|
|
|
/* This is the fundamental function for registering boot/module
|
|
parameters. perm sets the visibility in sysfs: 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) \
|
|
/* Default value instead of permissions? */ \
|
|
static int __param_perm_check_##name __attribute__((unused)) = \
|
|
BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)) \
|
|
+ BUILD_BUG_ON_ZERO(sizeof(""prefix) > MAX_PARAM_PREFIX_LEN); \
|
|
static const char __param_str_##name[] = prefix #name; \
|
|
static struct kernel_param __moduleparam_const __param_##name \
|
|
__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)
|
|
|
|
#ifndef MODULE
|
|
/**
|
|
* core_param - define a historical core kernel parameter.
|
|
* @name: the name of the cmdline and sysfs parameter (often the same as var)
|
|
* @var: the variable
|
|
* @type: the type (for param_set_##type and param_get_##type)
|
|
* @perm: visibility in sysfs
|
|
*
|
|
* core_param is just like module_param(), but cannot be modular and
|
|
* doesn't add a prefix (such as "printk."). This is for compatibility
|
|
* with __setup(), and it makes sense as truly core parameters aren't
|
|
* tied to the particular file they're in.
|
|
*/
|
|
#define core_param(name, var, type, perm) \
|
|
param_check_##type(name, &(var)); \
|
|
__module_param_call("", name, param_set_##type, param_get_##type, \
|
|
&var, perm)
|
|
#endif /* !MODULE */
|
|
|
|
/* Actually copy string: maxlen param is usually sizeof(string). */
|
|
#define module_param_string(name, string, len, perm) \
|
|
static const struct kparam_string __param_string_##name \
|
|
= { len, string }; \
|
|
module_param_call(name, param_set_copystring, param_get_string, \
|
|
.str = &__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 const 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, \
|
|
.arr = &__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);
|
|
|
|
/* for exporting parameters in /sys/parameters */
|
|
|
|
struct module;
|
|
|
|
#if defined(CONFIG_SYSFS) && defined(CONFIG_MODULES)
|
|
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);
|
|
#else
|
|
static inline int module_param_sysfs_setup(struct module *mod,
|
|
struct kernel_param *kparam,
|
|
unsigned int num_params)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void module_param_sysfs_remove(struct module *mod)
|
|
{ }
|
|
#endif
|
|
|
|
#endif /* _LINUX_MODULE_PARAMS_H */
|