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
|
/* 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 = { 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);
#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 */
|
