/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_UML_INIT_H
#define _LINUX_UML_INIT_H
/* These macros are used to mark some functions or
* initialized data ( doesn ' t apply to uninitialized data )
* as ` initialization ' functions . The kernel can take this
* as hint that the function is used only during the initialization
* phase and free up used memory resources after
*
* Usage :
* For functions :
*
* You should add _ _ init immediately before the function name , like :
*
* static void _ _ init initme ( int x , int y )
* {
* extern int z ; z = x * y ;
* }
*
* If the function has a prototype somewhere , you can also add
* _ _ init between closing brace of the prototype and semicolon :
*
* extern int initialize_foobar_device ( int , int , int ) _ _ init ;
*
* For initialized data :
* You should insert _ _ initdata between the variable name and equal
* sign followed by value , e . g . :
*
* static int init_variable _ _ initdata = 0 ;
* static const char linux_logo [ ] _ _ initconst = { 0 x32 , 0 x36 , . . . } ;
*
* Don ' t forget to initialize data not at file scope , i . e . within a function ,
* as gcc otherwise puts the data into the bss section and not into the init
* section .
*
* Also note , that this data cannot be " const " .
*/
#ifndef _LINUX_INIT_H
typedef int (*initcall_t)(void );
typedef void (*exitcall_t)(void );
#include <linux/compiler_types.h>
/* These are for everybody (although not all archs will actually
discard it in modules) */
#define __init __section(".init.text" )
#define __initdata __section(".init.data" )
#define __exitdata __section(".exit.data" )
#define __exit_call __used __section(".exitcall.exit" )
#ifdef MODULE
#define __exit __section(".exit.text" )
#else
#define __exit __used __section(".exit.text" )
#endif
#endif
#ifndef MODULE
struct uml_param {
const char *str;
int (*setup_func)(char *, int *);
};
extern initcall_t __uml_postsetup_start, __uml_postsetup_end;
extern const char *__uml_help_start, *__uml_help_end;
#endif
#define __uml_exitcall(fn) \
static exitcall_t __uml_exitcall_## fn __uml_exit_call = fn
extern struct uml_param __uml_setup_start, __uml_setup_end;
#define __uml_postsetup(fn) \
static initcall_t __uml_postsetup_## fn __uml_postsetup_call = fn
#define __non_empty_string(dummyname,string) \
struct __uml_non_empty_string_struct_## dummyname \
{ \
char _string[sizeof (string)-2 ]; \
}
#ifndef MODULE
#define __uml_setup(str, fn, help...) \
__non_empty_string(fn ## _setup, str); \
__uml_help(fn, help); \
static char __uml_setup_str_## fn[] __initdata = str; \
static struct uml_param __uml_setup_## fn __uml_init_setup = { __uml_setup_str_## fn, fn }
#else
#define __uml_setup(str, fn, help...) \
#endif
#define __uml_help(fn, help...) \
__non_empty_string(fn ## __help, help); \
static char __uml_help_str_## fn[] __initdata = help; \
static const char *__uml_help_## fn __uml_setup_help = __uml_help_str_## fn
/*
* Mark functions and data as being only used at initialization
* or exit time .
*/
#define __uml_init_setup __used __section(".uml.setup.init" )
#define __uml_setup_help __used __section(".uml.help.init" )
#define __uml_postsetup_call __used __section(".uml.postsetup.init" )
#define __uml_exit_call __used __section(".uml.exitcall.exit" )
#ifdef __UM_HOST__
#define __define_initcall(level,fn) \
static initcall_t __initcall_## fn __used \
__attribute__((__section__(".initcall" level ".init" ))) = fn
/* Userspace initcalls shouldn't depend on anything in the kernel, so we'll
* make them run first .
*/
#define __initcall(fn) __define_initcall("1" , fn)
#define __exitcall(fn) static exitcall_t __exitcall_## fn __exit_call = fn
#define __init_call __used __section(".initcall.init" )
#endif
#endif /* _LINUX_UML_INIT_H */
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