source: GPL/trunk/include/linux/init.h@ 250

Last change on this file since 250 was 32, checked in by vladest, 20 years ago

initial import
File size: 3.3 KB
Line 
1/* $Id: init.h,v 1.1.1.1 2003/07/02 13:57:00 eleph Exp $ */
2
3#ifndef _LINUX_INIT_H
4#define _LINUX_INIT_H
5
6/* These macros are used to mark some functions or
7 * initialized data (doesn't apply to uninitialized data)
8 * as `initialization' functions. The kernel can take this
9 * as hint that the function is used only during the initialization
10 * phase and free up used memory resources after
11 *
12 * Usage:
13 * For functions:
14 *
15 * You should add __init immediately before the function name, like:
16 *
17 * static void __init initme(int x, int y)
18 * {
19 * extern int z; z = x * y;
20 * }
21 *
22 * If the function has a prototype somewhere, you can also add
23 * __init between closing brace of the prototype and semicolon:
24 *
25 * extern int initialize_foobar_device(int, int, int) __init;
26 *
27 * For initialized data:
28 * You should insert __initdata between the variable name and equal
29 * sign followed by value, e.g.:
30 *
31 * static int init_variable __initdata = 0;
32 * static char linux_logo[] __initdata = { 0x32, 0x36, ... };
33 *
34 * For initialized data not at file scope, i.e. within a function,
35 * you should use __initlocaldata instead, due to a bug in GCC 2.7.
36 */
37
38#ifndef MODULE
39
40#ifndef __ASSEMBLY__
41
42/*
43 * Used for kernel command line parameter setup
44 */
45struct kernel_param {
46 const char *str;
47 int (*setup_func)(char *);
48};
49
50extern struct kernel_param __setup_start, __setup_end;
51
52#define __setup(str, fn) \
53 static char __setup_str_##fn[] __initdata = str; \
54 static struct kernel_param __setup_##fn __initsetup = { __setup_str_##fn, fn }
55
56#endif /* __ASSEMBLY__ */
57
58/*
59 * Used for initialization calls..
60 */
61typedef int (*initcall_t)(void);
62typedef void (*exitcall_t)(void);
63
64#define __initcall(fn) \
65 initcall_t __initcall_##fn = fn
66
67#define __exitcall(fn) \
68 exitcall_t __exitcall_##fn = fn
69
70
71/*
72 * Mark functions and data as being only used at initialization
73 * or exit time.
74 */
75#define __init
76#define __exit
77#define __initdata
78#define __exitdata
79#define __initsetup
80//#define __init_call
81#define __devinitdata
82#define __devinit
83#define __devexit
84
85/* For assembly routines */
86#define __INIT
87#define __FINIT
88#define __INITDATA
89
90#define module_init(x) __initcall(x);
91#define module_exit(x) __exitcall(x);
92
93#define extern_module_init(x) extern initcall_t __initcall_##x;
94#define extern_module_exit(x) extern exitcall_t __exitcall_##x;
95
96#else
97
98#define __init
99#define __exit
100#define __initdata
101#define __exitdata
102//#define __initcall
103/* For assembly routines */
104#define __INIT
105#define __FINIT
106#define __INITDATA
107#define __devinitdata
108#define __devinit
109#define __devexit
110
111/*
112 * Used for initialization calls..
113 */
114typedef int (*initcall_t)(void);
115typedef void (*exitcall_t)(void);
116
117#define __initcall(fn) \
118 initcall_t __initcall_##fn = fn
119
120#define __exitcall(fn) \
121 exitcall_t __exitcall_##fn = fn
122
123
124#define module_init(x) __initcall(x);
125#define module_exit(x) __exitcall(x);
126
127#define extern_module_init(x) extern initcall_t __initcall_##x;
128#define extern_module_exit(x) extern exitcall_t __exitcall_##x;
129
130#define __setup(str,func) /* nothing */
131
132#endif
133
134#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)
135#define __initlocaldata __initdata
136#else
137#define __initlocaldata
138#endif
139
140#endif /* _LINUX_INIT_H */
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