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 40 typedef int (*initcall_t)(void); 41 typedef 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 61 struct uml_param { 62 const char *str; 63 int (*setup_func)(char *, int *); 64 }; 65 66 extern initcall_t __uml_initcall_start, __uml_initcall_end; 67 extern initcall_t __uml_postsetup_start, __uml_postsetup_end; 68 extern 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 77 extern 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