1#ifndef _LINUX_UML_INIT_H
2#define _LINUX_UML_INIT_H
3
4/* These macros are used to mark some functions or
5 * initialized data (doesn't apply to uninitialized data)
6 * as `initialization' functions. The kernel can take this
7 * as hint that the function is used only during the initialization
8 * phase and free up used memory resources after
9 *
10 * Usage:
11 * For functions:
12 *
13 * You should add __init immediately before the function name, like:
14 *
15 * static void __init initme(int x, int y)
16 * {
17 *    extern int z; z = x * y;
18 * }
19 *
20 * If the function has a prototype somewhere, you can also add
21 * __init between closing brace of the prototype and semicolon:
22 *
23 * extern int initialize_foobar_device(int, int, int) __init;
24 *
25 * For initialized data:
26 * You should insert __initdata between the variable name and equal
27 * sign followed by value, e.g.:
28 *
29 * static int init_variable __initdata = 0;
30 * static const char linux_logo[] __initconst = { 0x32, 0x36, ... };
31 *
32 * Don't forget to initialize data not at file scope, i.e. within a function,
33 * as gcc otherwise puts the data into the bss section and not into the init
34 * section.
35 *
36 * Also note, that this data cannot be "const".
37 */
38
39#ifndef _LINUX_INIT_H
40typedef int (*initcall_t)(void);
41typedef void (*exitcall_t)(void);
42
43#include <linux/compiler.h>
44
45/* These are for everybody (although not all archs will actually
46   discard it in modules) */
47#define __init		__section(.init.text)
48#define __initdata	__section(.init.data)
49#define __exitdata	__section(.exit.data)
50#define __exit_call	__used __section(.exitcall.exit)
51
52#ifdef MODULE
53#define __exit		__section(.exit.text)
54#else
55#define __exit		__used __section(.exit.text)
56#endif
57
58#endif
59
60#ifndef MODULE
61struct uml_param {
62        const char *str;
63        int (*setup_func)(char *, int *);
64};
65
66extern initcall_t __uml_initcall_start, __uml_initcall_end;
67extern initcall_t __uml_postsetup_start, __uml_postsetup_end;
68extern const char *__uml_help_start, *__uml_help_end;
69#endif
70
71#define __uml_initcall(fn)					  	\
72	static initcall_t __uml_initcall_##fn __uml_init_call = fn
73
74#define __uml_exitcall(fn)						\
75	static exitcall_t __uml_exitcall_##fn __uml_exit_call = fn
76
77extern struct uml_param __uml_setup_start, __uml_setup_end;
78
79#define __uml_postsetup(fn)						\
80	static initcall_t __uml_postsetup_##fn __uml_postsetup_call = fn
81
82#define __non_empty_string(dummyname,string)				\
83	struct __uml_non_empty_string_struct_##dummyname		\
84	{								\
85		char _string[sizeof(string)-2];				\
86	}
87
88#ifndef MODULE
89#define __uml_setup(str, fn, help...)					\
90	__non_empty_string(fn ##_setup, str);				\
91	__uml_help(fn, help);						\
92	static char __uml_setup_str_##fn[] __initdata = str;		\
93	static struct uml_param __uml_setup_##fn __uml_init_setup = { __uml_setup_str_##fn, fn }
94#else
95#define __uml_setup(str, fn, help...)					\
96
97#endif
98
99#define __uml_help(fn, help...)						\
100	__non_empty_string(fn ##__help, help);				\
101	static char __uml_help_str_##fn[] __initdata = help;		\
102	static const char *__uml_help_##fn __uml_setup_help = __uml_help_str_##fn
103
104/*
105 * Mark functions and data as being only used at initialization
106 * or exit time.
107 */
108#define __uml_init_setup	__used __section(.uml.setup.init)
109#define __uml_setup_help	__used __section(.uml.help.init)
110#define __uml_init_call		__used __section(.uml.initcall.init)
111#define __uml_postsetup_call	__used __section(.uml.postsetup.init)
112#define __uml_exit_call		__used __section(.uml.exitcall.exit)
113
114#ifdef __UM_HOST__
115
116#define __define_initcall(level,fn) \
117	static initcall_t __initcall_##fn __used \
118	__attribute__((__section__(".initcall" level ".init"))) = fn
119
120/* Userspace initcalls shouldn't depend on anything in the kernel, so we'll
121 * make them run first.
122 */
123#define __initcall(fn) __define_initcall("1", fn)
124
125#define __exitcall(fn) static exitcall_t __exitcall_##fn __exit_call = fn
126
127#define __init_call	__used __section(.initcall.init)
128
129#endif
130
131#endif /* _LINUX_UML_INIT_H */
132