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TOMOYO Linux Cross Reference
Linux/include/linux/init.h

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  1 #ifndef _LINUX_INIT_H
  2 #define _LINUX_INIT_H
  3 
  4 #include <linux/compiler.h>
  5 #include <linux/types.h>
  6 
  7 /* These macros are used to mark some functions or 
  8  * initialized data (doesn't apply to uninitialized data)
  9  * as `initialization' functions. The kernel can take this
 10  * as hint that the function is used only during the initialization
 11  * phase and free up used memory resources after
 12  *
 13  * Usage:
 14  * For functions:
 15  * 
 16  * You should add __init immediately before the function name, like:
 17  *
 18  * static void __init initme(int x, int y)
 19  * {
 20  *    extern int z; z = x * y;
 21  * }
 22  *
 23  * If the function has a prototype somewhere, you can also add
 24  * __init between closing brace of the prototype and semicolon:
 25  *
 26  * extern int initialize_foobar_device(int, int, int) __init;
 27  *
 28  * For initialized data:
 29  * You should insert __initdata between the variable name and equal
 30  * sign followed by value, e.g.:
 31  *
 32  * static int init_variable __initdata = 0;
 33  * static const char linux_logo[] __initconst = { 0x32, 0x36, ... };
 34  *
 35  * Don't forget to initialize data not at file scope, i.e. within a function,
 36  * as gcc otherwise puts the data into the bss section and not into the init
 37  * section.
 38  * 
 39  * Also note, that this data cannot be "const".
 40  */
 41 
 42 /* These are for everybody (although not all archs will actually
 43    discard it in modules) */
 44 #define __init          __section(.init.text) __cold notrace
 45 #define __initdata      __section(.init.data)
 46 #define __initconst     __constsection(.init.rodata)
 47 #define __exitdata      __section(.exit.data)
 48 #define __exit_call     __used __section(.exitcall.exit)
 49 
 50 /*
 51  * Some architecture have tool chains which do not handle rodata attributes
 52  * correctly. For those disable special sections for const, so that other
 53  * architectures can annotate correctly.
 54  */
 55 #ifdef CONFIG_BROKEN_RODATA
 56 #define __constsection(x)
 57 #else
 58 #define __constsection(x) __section(x)
 59 #endif
 60 
 61 /*
 62  * modpost check for section mismatches during the kernel build.
 63  * A section mismatch happens when there are references from a
 64  * code or data section to an init section (both code or data).
 65  * The init sections are (for most archs) discarded by the kernel
 66  * when early init has completed so all such references are potential bugs.
 67  * For exit sections the same issue exists.
 68  *
 69  * The following markers are used for the cases where the reference to
 70  * the *init / *exit section (code or data) is valid and will teach
 71  * modpost not to issue a warning.  Intended semantics is that a code or
 72  * data tagged __ref* can reference code or data from init section without
 73  * producing a warning (of course, no warning does not mean code is
 74  * correct, so optimally document why the __ref is needed and why it's OK).
 75  *
 76  * The markers follow same syntax rules as __init / __initdata.
 77  */
 78 #define __ref            __section(.ref.text) noinline
 79 #define __refdata        __section(.ref.data)
 80 #define __refconst       __constsection(.ref.rodata)
 81 
 82 /* compatibility defines */
 83 #define __init_refok     __ref
 84 #define __initdata_refok __refdata
 85 #define __exit_refok     __ref
 86 
 87 
 88 #ifdef MODULE
 89 #define __exitused
 90 #else
 91 #define __exitused  __used
 92 #endif
 93 
 94 #define __exit          __section(.exit.text) __exitused __cold notrace
 95 
 96 /* Used for HOTPLUG_CPU */
 97 #define __cpuinit        __section(.cpuinit.text) __cold notrace
 98 #define __cpuinitdata    __section(.cpuinit.data)
 99 #define __cpuinitconst   __constsection(.cpuinit.rodata)
100 #define __cpuexit        __section(.cpuexit.text) __exitused __cold notrace
101 #define __cpuexitdata    __section(.cpuexit.data)
102 #define __cpuexitconst   __constsection(.cpuexit.rodata)
103 
104 /* Used for MEMORY_HOTPLUG */
105 #define __meminit        __section(.meminit.text) __cold notrace
106 #define __meminitdata    __section(.meminit.data)
107 #define __meminitconst   __constsection(.meminit.rodata)
108 #define __memexit        __section(.memexit.text) __exitused __cold notrace
109 #define __memexitdata    __section(.memexit.data)
110 #define __memexitconst   __constsection(.memexit.rodata)
111 
112 /* For assembly routines */
113 #define __HEAD          .section        ".head.text","ax"
114 #define __INIT          .section        ".init.text","ax"
115 #define __FINIT         .previous
116 
117 #define __INITDATA      .section        ".init.data","aw",%progbits
118 #define __INITRODATA    .section        ".init.rodata","a",%progbits
119 #define __FINITDATA     .previous
120 
121 #define __CPUINIT        .section       ".cpuinit.text", "ax"
122 #define __CPUINITDATA    .section       ".cpuinit.data", "aw"
123 #define __CPUINITRODATA  .section       ".cpuinit.rodata", "a"
124 
125 #define __MEMINIT        .section       ".meminit.text", "ax"
126 #define __MEMINITDATA    .section       ".meminit.data", "aw"
127 #define __MEMINITRODATA  .section       ".meminit.rodata", "a"
128 
129 /* silence warnings when references are OK */
130 #define __REF            .section       ".ref.text", "ax"
131 #define __REFDATA        .section       ".ref.data", "aw"
132 #define __REFCONST       .section       ".ref.rodata", "a"
133 
134 #ifndef __ASSEMBLY__
135 /*
136  * Used for initialization calls..
137  */
138 typedef int (*initcall_t)(void);
139 typedef void (*exitcall_t)(void);
140 
141 extern initcall_t __con_initcall_start[], __con_initcall_end[];
142 extern initcall_t __security_initcall_start[], __security_initcall_end[];
143 
144 /* Used for contructor calls. */
145 typedef void (*ctor_fn_t)(void);
146 
147 /* Defined in init/main.c */
148 extern int do_one_initcall(initcall_t fn);
149 extern char __initdata boot_command_line[];
150 extern char *saved_command_line;
151 extern unsigned int reset_devices;
152 
153 /* used by init/main.c */
154 void setup_arch(char **);
155 void prepare_namespace(void);
156 void __init load_default_modules(void);
157 
158 extern void (*late_time_init)(void);
159 
160 extern bool initcall_debug;
161 
162 #endif
163   
164 #ifndef MODULE
165 
166 #ifndef __ASSEMBLY__
167 
168 /* initcalls are now grouped by functionality into separate 
169  * subsections. Ordering inside the subsections is determined
170  * by link order. 
171  * For backwards compatibility, initcall() puts the call in 
172  * the device init subsection.
173  *
174  * The `id' arg to __define_initcall() is needed so that multiple initcalls
175  * can point at the same handler without causing duplicate-symbol build errors.
176  */
177 
178 #define __define_initcall(fn, id) \
179         static initcall_t __initcall_##fn##id __used \
180         __attribute__((__section__(".initcall" #id ".init"))) = fn
181 
182 /*
183  * Early initcalls run before initializing SMP.
184  *
185  * Only for built-in code, not modules.
186  */
187 #define early_initcall(fn)              __define_initcall(fn, early)
188 
189 /*
190  * A "pure" initcall has no dependencies on anything else, and purely
191  * initializes variables that couldn't be statically initialized.
192  *
193  * This only exists for built-in code, not for modules.
194  * Keep main.c:initcall_level_names[] in sync.
195  */
196 #define pure_initcall(fn)               __define_initcall(fn, 0)
197 
198 #define core_initcall(fn)               __define_initcall(fn, 1)
199 #define core_initcall_sync(fn)          __define_initcall(fn, 1s)
200 #define postcore_initcall(fn)           __define_initcall(fn, 2)
201 #define postcore_initcall_sync(fn)      __define_initcall(fn, 2s)
202 #define arch_initcall(fn)               __define_initcall(fn, 3)
203 #define arch_initcall_sync(fn)          __define_initcall(fn, 3s)
204 #define subsys_initcall(fn)             __define_initcall(fn, 4)
205 #define subsys_initcall_sync(fn)        __define_initcall(fn, 4s)
206 #define fs_initcall(fn)                 __define_initcall(fn, 5)
207 #define fs_initcall_sync(fn)            __define_initcall(fn, 5s)
208 #define rootfs_initcall(fn)             __define_initcall(fn, rootfs)
209 #define device_initcall(fn)             __define_initcall(fn, 6)
210 #define device_initcall_sync(fn)        __define_initcall(fn, 6s)
211 #define late_initcall(fn)               __define_initcall(fn, 7)
212 #define late_initcall_sync(fn)          __define_initcall(fn, 7s)
213 
214 #define __initcall(fn) device_initcall(fn)
215 
216 #define __exitcall(fn) \
217         static exitcall_t __exitcall_##fn __exit_call = fn
218 
219 #define console_initcall(fn) \
220         static initcall_t __initcall_##fn \
221         __used __section(.con_initcall.init) = fn
222 
223 #define security_initcall(fn) \
224         static initcall_t __initcall_##fn \
225         __used __section(.security_initcall.init) = fn
226 
227 struct obs_kernel_param {
228         const char *str;
229         int (*setup_func)(char *);
230         int early;
231 };
232 
233 /*
234  * Only for really core code.  See moduleparam.h for the normal way.
235  *
236  * Force the alignment so the compiler doesn't space elements of the
237  * obs_kernel_param "array" too far apart in .init.setup.
238  */
239 #define __setup_param(str, unique_id, fn, early)                        \
240         static const char __setup_str_##unique_id[] __initconst \
241                 __aligned(1) = str; \
242         static struct obs_kernel_param __setup_##unique_id      \
243                 __used __section(.init.setup)                   \
244                 __attribute__((aligned((sizeof(long)))))        \
245                 = { __setup_str_##unique_id, fn, early }
246 
247 #define __setup(str, fn)                                        \
248         __setup_param(str, fn, fn, 0)
249 
250 /* NOTE: fn is as per module_param, not __setup!  Emits warning if fn
251  * returns non-zero. */
252 #define early_param(str, fn)                                    \
253         __setup_param(str, fn, fn, 1)
254 
255 /* Relies on boot_command_line being set */
256 void __init parse_early_param(void);
257 void __init parse_early_options(char *cmdline);
258 #endif /* __ASSEMBLY__ */
259 
260 /**
261  * module_init() - driver initialization entry point
262  * @x: function to be run at kernel boot time or module insertion
263  * 
264  * module_init() will either be called during do_initcalls() (if
265  * builtin) or at module insertion time (if a module).  There can only
266  * be one per module.
267  */
268 #define module_init(x)  __initcall(x);
269 
270 /**
271  * module_exit() - driver exit entry point
272  * @x: function to be run when driver is removed
273  * 
274  * module_exit() will wrap the driver clean-up code
275  * with cleanup_module() when used with rmmod when
276  * the driver is a module.  If the driver is statically
277  * compiled into the kernel, module_exit() has no effect.
278  * There can only be one per module.
279  */
280 #define module_exit(x)  __exitcall(x);
281 
282 #else /* MODULE */
283 
284 /* Don't use these in loadable modules, but some people do... */
285 #define early_initcall(fn)              module_init(fn)
286 #define core_initcall(fn)               module_init(fn)
287 #define postcore_initcall(fn)           module_init(fn)
288 #define arch_initcall(fn)               module_init(fn)
289 #define subsys_initcall(fn)             module_init(fn)
290 #define fs_initcall(fn)                 module_init(fn)
291 #define device_initcall(fn)             module_init(fn)
292 #define late_initcall(fn)               module_init(fn)
293 
294 #define security_initcall(fn)           module_init(fn)
295 
296 /* Each module must use one module_init(). */
297 #define module_init(initfn)                                     \
298         static inline initcall_t __inittest(void)               \
299         { return initfn; }                                      \
300         int init_module(void) __attribute__((alias(#initfn)));
301 
302 /* This is only required if you want to be unloadable. */
303 #define module_exit(exitfn)                                     \
304         static inline exitcall_t __exittest(void)               \
305         { return exitfn; }                                      \
306         void cleanup_module(void) __attribute__((alias(#exitfn)));
307 
308 #define __setup_param(str, unique_id, fn)       /* nothing */
309 #define __setup(str, func)                      /* nothing */
310 #endif
311 
312 /* Data marked not to be saved by software suspend */
313 #define __nosavedata __section(.data..nosave)
314 
315 /* This means "can be init if no module support, otherwise module load
316    may call it." */
317 #ifdef CONFIG_MODULES
318 #define __init_or_module
319 #define __initdata_or_module
320 #define __initconst_or_module
321 #define __INIT_OR_MODULE        .text
322 #define __INITDATA_OR_MODULE    .data
323 #define __INITRODATA_OR_MODULE  .section ".rodata","a",%progbits
324 #else
325 #define __init_or_module __init
326 #define __initdata_or_module __initdata
327 #define __initconst_or_module __initconst
328 #define __INIT_OR_MODULE __INIT
329 #define __INITDATA_OR_MODULE __INITDATA
330 #define __INITRODATA_OR_MODULE __INITRODATA
331 #endif /*CONFIG_MODULES*/
332 
333 #ifdef MODULE
334 #define __exit_p(x) x
335 #else
336 #define __exit_p(x) NULL
337 #endif
338 
339 #endif /* _LINUX_INIT_H */
340 

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