aboutsummaryrefslogtreecommitdiff
path: root/arch/um/include/shared/init.h
blob: 37dd097c16c07131282b8ddd484d52e1cb6fd369 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
#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 char linux_logo[] __initdata = { 0x32, 0x36, ... };
 *
 * 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);

#ifndef __KERNEL__
#ifndef __section
# define __section(S) __attribute__ ((__section__(#S)))
#endif

#if __GNUC__ == 3

#if __GNUC_MINOR__ >= 3
# define __used			__attribute__((__used__))
#else
# define __used			__attribute__((__unused__))
#endif

#else
#if __GNUC__ == 4
# define __used			__attribute__((__used__))
#endif
#endif

#else
#include <linux/compiler.h>
#endif
/* 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_initcall_start, __uml_initcall_end;
extern initcall_t __uml_postsetup_start, __uml_postsetup_end;
extern const char *__uml_help_start, *__uml_help_end;
#endif

#define __uml_initcall(fn)					  	\
	static initcall_t __uml_initcall_##fn __uml_init_call = fn

#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_init_call		__used __section(.uml.initcall.init)
#define __uml_postsetup_call	__used __section(.uml.postsetup.init)
#define __uml_exit_call		__used __section(.uml.exitcall.exit)

#ifndef __KERNEL__

#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 */