5 #include <l4/dde/ddekit/initcall.h>
7 #include <linux/compiler.h>
9 /* These macros are used to mark some functions or
10 * initialized data (doesn't apply to uninitialized data)
11 * as `initialization' functions. The kernel can take this
12 * as hint that the function is used only during the initialization
13 * phase and free up used memory resources after
18 * You should add __init immediately before the function name, like:
20 * static void __init initme(int x, int y)
22 * extern int z; z = x * y;
25 * If the function has a prototype somewhere, you can also add
26 * __init between closing brace of the prototype and semicolon:
28 * extern int initialize_foobar_device(int, int, int) __init;
30 * For initialized data:
31 * You should insert __initdata between the variable name and equal
32 * sign followed by value, e.g.:
34 * static int init_variable __initdata = 0;
35 * static char linux_logo[] __initdata = { 0x32, 0x36, ... };
37 * Don't forget to initialize data not at file scope, i.e. within a function,
38 * as gcc otherwise puts the data into the bss section and not into the init
41 * Also note, that this data cannot be "const".
44 /* These are for everybody (although not all archs will actually
45 discard it in modules) */
47 #define __init __section(.init.text) __cold notrace
51 #define __initdata __section(.init.data)
52 #define __initconst __section(.init.rodata)
53 #define __exitdata __section(.exit.data)
54 #define __exit_call __used __section(.exitcall.exit)
56 /* modpost check for section mismatches during the kernel build.
57 * A section mismatch happens when there are references from a
58 * code or data section to an init section (both code or data).
59 * The init sections are (for most archs) discarded by the kernel
60 * when early init has completed so all such references are potential bugs.
61 * For exit sections the same issue exists.
62 * The following markers are used for the cases where the reference to
63 * the *init / *exit section (code or data) is valid and will teach
64 * modpost not to issue a warning.
65 * The markers follow same syntax rules as __init / __initdata. */
66 #define __ref __section(.ref.text) noinline
67 #define __refdata __section(.ref.data)
68 #define __refconst __section(.ref.rodata)
70 /* backward compatibility note
71 * A few places hardcode the old section names:
75 * They should be converted to use the defines from this file
78 /* compatibility defines */
79 #define __init_refok __ref
80 #define __initdata_refok __refdata
81 #define __exit_refok __ref
87 #define __exitused __used
90 #define __exit __section(.exit.text) __exitused __cold
92 /* Used for HOTPLUG */
93 #define __devinit __section(.devinit.text) __cold
94 #define __devinitdata __section(.devinit.data)
95 #define __devinitconst __section(.devinit.rodata)
96 #define __devexit __section(.devexit.text) __exitused __cold
97 #define __devexitdata __section(.devexit.data)
98 #define __devexitconst __section(.devexit.rodata)
100 /* Used for HOTPLUG_CPU */
101 #define __cpuinit __section(.cpuinit.text) __cold
102 #define __cpuinitdata __section(.cpuinit.data)
103 #define __cpuinitconst __section(.cpuinit.rodata)
104 #define __cpuexit __section(.cpuexit.text) __exitused __cold
105 #define __cpuexitdata __section(.cpuexit.data)
106 #define __cpuexitconst __section(.cpuexit.rodata)
108 /* Used for MEMORY_HOTPLUG */
109 #define __meminit __section(.meminit.text) __cold
110 #define __meminitdata __section(.meminit.data)
111 #define __meminitconst __section(.meminit.rodata)
112 #define __memexit __section(.memexit.text) __exitused __cold
113 #define __memexitdata __section(.memexit.data)
114 #define __memexitconst __section(.memexit.rodata)
116 /* For assembly routines */
117 #define __HEAD .section ".head.text","ax"
118 #define __INIT .section ".init.text","ax"
119 #define __FINIT .previous
121 #define __INITDATA .section ".init.data","aw"
122 #define __INITRODATA .section ".init.rodata","a"
123 #define __FINITDATA .previous
125 #define __DEVINIT .section ".devinit.text", "ax"
126 #define __DEVINITDATA .section ".devinit.data", "aw"
127 #define __DEVINITRODATA .section ".devinit.rodata", "a"
129 #define __CPUINIT .section ".cpuinit.text", "ax"
130 #define __CPUINITDATA .section ".cpuinit.data", "aw"
131 #define __CPUINITRODATA .section ".cpuinit.rodata", "a"
133 #define __MEMINIT .section ".meminit.text", "ax"
134 #define __MEMINITDATA .section ".meminit.data", "aw"
135 #define __MEMINITRODATA .section ".meminit.rodata", "a"
137 /* silence warnings when references are OK */
138 #define __REF .section ".ref.text", "ax"
139 #define __REFDATA .section ".ref.data", "aw"
140 #define __REFCONST .section ".ref.rodata", "a"
144 * Used for initialization calls..
146 typedef int (*initcall_t)(void);
147 typedef void (*exitcall_t)(void);
149 extern initcall_t __con_initcall_start[], __con_initcall_end[];
150 extern initcall_t __security_initcall_start[], __security_initcall_end[];
152 /* Defined in init/main.c */
153 extern int do_one_initcall(initcall_t fn);
154 extern char __initdata boot_command_line[];
155 extern char *saved_command_line;
156 extern unsigned int reset_devices;
158 /* used by init/main.c */
159 void setup_arch(char **);
160 void prepare_namespace(void);
162 extern void (*late_time_init)(void);
170 /* initcalls are now grouped by functionality into separate
171 * subsections. Ordering inside the subsections is determined
173 * For backwards compatibility, initcall() puts the call in
174 * the device init subsection.
176 * The `id' arg to __define_initcall() is needed so that multiple initcalls
177 * can point at the same handler without causing duplicate-symbol build errors.
181 #define __define_initcall(level,fn,id) \
182 static initcall_t __initcall_##fn##id __used \
183 __attribute__((__section__(".initcall" level ".init"))) = fn
185 // XXX: DDE CTORs are executed in reverse order as was done by
186 // Linux' initcalls in earlier versions
187 #include <l4/dde/ddekit/initcall.h>
188 #define __define_initcall(level,fn,id) DDEKIT_CTOR(fn,level)
192 * Early initcalls run before initializing SMP.
194 * Only for built-in code, not modules.
196 #define early_initcall(fn) __define_initcall("early",fn,early)
199 * A "pure" initcall has no dependencies on anything else, and purely
200 * initializes variables that couldn't be statically initialized.
202 * This only exists for built-in code, not for modules.
205 #define pure_initcall(fn) __define_initcall("0",fn,0)
207 #define core_initcall(fn) __define_initcall("1",fn,1)
208 #define core_initcall_sync(fn) __define_initcall("1s",fn,1s)
209 #define postcore_initcall(fn) __define_initcall("2",fn,2)
210 #define postcore_initcall_sync(fn) __define_initcall("2s",fn,2s)
211 #define arch_initcall(fn) __define_initcall("3",fn,3)
212 #define arch_initcall_sync(fn) __define_initcall("3s",fn,3s)
213 #define subsys_initcall(fn) __define_initcall("4",fn,4)
214 #define subsys_initcall_sync(fn) __define_initcall("4s",fn,4s)
215 #define fs_initcall(fn) __define_initcall("5",fn,5)
216 #define fs_initcall_sync(fn) __define_initcall("5s",fn,5s)
217 #define rootfs_initcall(fn) __define_initcall("rootfs",fn,rootfs)
218 #define device_initcall(fn) __define_initcall("6",fn,6)
219 #define device_initcall_sync(fn) __define_initcall("6s",fn,6s)
220 #define late_initcall(fn) __define_initcall("7",fn,7)
221 #define late_initcall_sync(fn) __define_initcall("7s",fn,7s)
222 #else /* DDE_LINUX */
223 #define pure_initcall(fn) __define_initcall(1000,fn,1000)
225 #define dde_initcall(fn) __define_initcall(1008,fn,10)
226 #define dde_process_initcall(fn) __define_initcall(1007,fn,10)
227 #define core_initcall(fn) __define_initcall(1006,fn,7)
228 #define core_initcall_sync(fn) __define_initcall(1006s,fn,7s)
229 #define postcore_initcall(fn) __define_initcall(1005,fn,6)
230 #define postcore_initcall_sync(fn) __define_initcall(1005s,fn,6s)
231 #define arch_initcall(fn) __define_initcall(1004,fn,5)
232 #define arch_initcall_sync(fn) __define_initcall(1004s,fn,5s)
233 #define subsys_initcall(fn) __define_initcall(1003,fn,4)
234 #define subsys_initcall_sync(fn) __define_initcall(1003s,fn,4s)
235 #define fs_initcall(fn) __define_initcall(1002,fn,3)
236 #define fs_initcall_sync(fn) __define_initcall(1002s,fn,3s)
237 //#define rootfs_initcall(fn) __define_initcall(ootfs,fn,rootfs)
238 #define device_initcall(fn) __define_initcall(1001,fn,2)
239 #define device_initcall_sync(fn) __define_initcall(1001s,fn,2s)
240 #define late_initcall(fn) __define_initcall(1000,fn,1)
241 #define late_initcall_sync(fn) __define_initcall(1000s,fn,1s)
244 #define __initcall(fn) device_initcall(fn)
247 #define __exitcall(fn) \
248 static exitcall_t __exitcall_##fn __exit_call = fn
250 #define __exitcall(fn)
253 #define console_initcall(fn) \
254 static initcall_t __initcall_##fn \
255 __used __section(.con_initcall.init) = fn
257 #define security_initcall(fn) \
258 static initcall_t __initcall_##fn \
259 __used __section(.security_initcall.init) = fn
261 struct obs_kernel_param {
263 int (*setup_func)(char *);
268 * Only for really core code. See moduleparam.h for the normal way.
270 * Force the alignment so the compiler doesn't space elements of the
271 * obs_kernel_param "array" too far apart in .init.setup.
273 #define __setup_param(str, unique_id, fn, early) \
274 static char __setup_str_##unique_id[] __initdata __aligned(1) = str; \
275 static struct obs_kernel_param __setup_##unique_id \
276 __used __section(.init.setup) \
277 __attribute__((aligned((sizeof(long))))) \
278 = { __setup_str_##unique_id, fn, early }
280 #define __setup(str, fn) \
281 __setup_param(str, fn, fn, 0)
283 /* NOTE: fn is as per module_param, not __setup! Emits warning if fn
284 * returns non-zero. */
285 #define early_param(str, fn) \
286 __setup_param(str, fn, fn, 1)
288 /* Relies on boot_command_line being set */
289 void __init parse_early_param(void);
290 #endif /* __ASSEMBLY__ */
293 * module_init() - driver initialization entry point
294 * @x: function to be run at kernel boot time or module insertion
296 * module_init() will either be called during do_initcalls() (if
297 * builtin) or at module insertion time (if a module). There can only
300 #define module_init(x) __initcall(x);
303 * module_exit() - driver exit entry point
304 * @x: function to be run when driver is removed
306 * module_exit() will wrap the driver clean-up code
307 * with cleanup_module() when used with rmmod when
308 * the driver is a module. If the driver is statically
309 * compiled into the kernel, module_exit() has no effect.
310 * There can only be one per module.
312 #define module_exit(x) __exitcall(x);
316 /* Don't use these in modules, but some people do... */
317 #define core_initcall(fn) module_init(fn)
318 #define postcore_initcall(fn) module_init(fn)
319 #define arch_initcall(fn) module_init(fn)
320 #define subsys_initcall(fn) module_init(fn)
321 #define fs_initcall(fn) module_init(fn)
322 #define device_initcall(fn) module_init(fn)
323 #define late_initcall(fn) module_init(fn)
325 #define security_initcall(fn) module_init(fn)
327 /* Each module must use one module_init(). */
328 #define module_init(initfn) \
329 static inline initcall_t __inittest(void) \
331 int init_module(void) __attribute__((alias(#initfn)));
333 /* This is only required if you want to be unloadable. */
334 #define module_exit(exitfn) \
335 static inline exitcall_t __exittest(void) \
337 void cleanup_module(void) __attribute__((alias(#exitfn)));
339 #define __setup_param(str, unique_id, fn) /* nothing */
340 #define __setup(str, func) /* nothing */
343 /* Data marked not to be saved by software suspend */
344 #define __nosavedata __section(.data.nosave)
346 /* This means "can be init if no module support, otherwise module load
348 #ifdef CONFIG_MODULES
349 #define __init_or_module
350 #define __initdata_or_module
352 #define __init_or_module __init
353 #define __initdata_or_module __initdata
354 #endif /*CONFIG_MODULES*/
356 /* Functions marked as __devexit may be discarded at kernel link time, depending
357 on config options. Newer versions of binutils detect references from
358 retained sections to discarded sections and flag an error. Pointers to
359 __devexit functions must use __devexit_p(function_name), the wrapper will
360 insert either the function_name or NULL, depending on the config options.
362 #if defined(MODULE) || defined(CONFIG_HOTPLUG)
363 #define __devexit_p(x) x
365 #define __devexit_p(x) NULL
369 #define __exit_p(x) x
371 #define __exit_p(x) NULL
374 #endif /* _LINUX_INIT_H */