~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.1-rc2 ] ~ [ linux-5.0.4 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.31 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.108 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.165 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.177 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.137 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.63 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 or __initconst between the variable name
 30  * and equal 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 
 40 /* These are for everybody (although not all archs will actually
 41    discard it in modules) */
 42 #define __init          __section(.init.text) __cold __inittrace __latent_entropy
 43 #define __initdata      __section(.init.data)
 44 #define __initconst     __section(.init.rodata)
 45 #define __exitdata      __section(.exit.data)
 46 #define __exit_call     __used __section(.exitcall.exit)
 47 
 48 /*
 49  * modpost check for section mismatches during the kernel build.
 50  * A section mismatch happens when there are references from a
 51  * code or data section to an init section (both code or data).
 52  * The init sections are (for most archs) discarded by the kernel
 53  * when early init has completed so all such references are potential bugs.
 54  * For exit sections the same issue exists.
 55  *
 56  * The following markers are used for the cases where the reference to
 57  * the *init / *exit section (code or data) is valid and will teach
 58  * modpost not to issue a warning.  Intended semantics is that a code or
 59  * data tagged __ref* can reference code or data from init section without
 60  * producing a warning (of course, no warning does not mean code is
 61  * correct, so optimally document why the __ref is needed and why it's OK).
 62  *
 63  * The markers follow same syntax rules as __init / __initdata.
 64  */
 65 #define __ref            __section(.ref.text) noinline
 66 #define __refdata        __section(.ref.data)
 67 #define __refconst       __section(.ref.rodata)
 68 
 69 #ifdef MODULE
 70 #define __exitused
 71 #define __inittrace notrace
 72 #else
 73 #define __exitused  __used
 74 #define __inittrace
 75 #endif
 76 
 77 #define __exit          __section(.exit.text) __exitused __cold notrace
 78 
 79 /* Used for MEMORY_HOTPLUG */
 80 #define __meminit        __section(.meminit.text) __cold notrace \
 81                                                   __latent_entropy
 82 #define __meminitdata    __section(.meminit.data)
 83 #define __meminitconst   __section(.meminit.rodata)
 84 #define __memexit        __section(.memexit.text) __exitused __cold notrace
 85 #define __memexitdata    __section(.memexit.data)
 86 #define __memexitconst   __section(.memexit.rodata)
 87 
 88 /* For assembly routines */
 89 #define __HEAD          .section        ".head.text","ax"
 90 #define __INIT          .section        ".init.text","ax"
 91 #define __FINIT         .previous
 92 
 93 #define __INITDATA      .section        ".init.data","aw",%progbits
 94 #define __INITRODATA    .section        ".init.rodata","a",%progbits
 95 #define __FINITDATA     .previous
 96 
 97 #define __MEMINIT        .section       ".meminit.text", "ax"
 98 #define __MEMINITDATA    .section       ".meminit.data", "aw"
 99 #define __MEMINITRODATA  .section       ".meminit.rodata", "a"
100 
101 /* silence warnings when references are OK */
102 #define __REF            .section       ".ref.text", "ax"
103 #define __REFDATA        .section       ".ref.data", "aw"
104 #define __REFCONST       .section       ".ref.rodata", "a"
105 
106 #ifndef __ASSEMBLY__
107 /*
108  * Used for initialization calls..
109  */
110 typedef int (*initcall_t)(void);
111 typedef void (*exitcall_t)(void);
112 
113 extern initcall_t __con_initcall_start[], __con_initcall_end[];
114 extern initcall_t __security_initcall_start[], __security_initcall_end[];
115 
116 /* Used for contructor calls. */
117 typedef void (*ctor_fn_t)(void);
118 
119 /* Defined in init/main.c */
120 extern int do_one_initcall(initcall_t fn);
121 extern char __initdata boot_command_line[];
122 extern char *saved_command_line;
123 extern unsigned int reset_devices;
124 
125 /* used by init/main.c */
126 void setup_arch(char **);
127 void prepare_namespace(void);
128 void __init load_default_modules(void);
129 int __init init_rootfs(void);
130 
131 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
132 extern bool rodata_enabled;
133 #endif
134 #ifdef CONFIG_STRICT_KERNEL_RWX
135 void mark_rodata_ro(void);
136 #endif
137 
138 extern void (*late_time_init)(void);
139 
140 extern bool initcall_debug;
141 
142 #endif
143   
144 #ifndef MODULE
145 
146 #ifndef __ASSEMBLY__
147 
148 /*
149  * initcalls are now grouped by functionality into separate
150  * subsections. Ordering inside the subsections is determined
151  * by link order. 
152  * For backwards compatibility, initcall() puts the call in 
153  * the device init subsection.
154  *
155  * The `id' arg to __define_initcall() is needed so that multiple initcalls
156  * can point at the same handler without causing duplicate-symbol build errors.
157  *
158  * Initcalls are run by placing pointers in initcall sections that the
159  * kernel iterates at runtime. The linker can do dead code / data elimination
160  * and remove that completely, so the initcall sections have to be marked
161  * as KEEP() in the linker script.
162  */
163 
164 #define __define_initcall(fn, id) \
165         static initcall_t __initcall_##fn##id __used \
166         __attribute__((__section__(".initcall" #id ".init"))) = fn;
167 
168 /*
169  * Early initcalls run before initializing SMP.
170  *
171  * Only for built-in code, not modules.
172  */
173 #define early_initcall(fn)              __define_initcall(fn, early)
174 
175 /*
176  * A "pure" initcall has no dependencies on anything else, and purely
177  * initializes variables that couldn't be statically initialized.
178  *
179  * This only exists for built-in code, not for modules.
180  * Keep main.c:initcall_level_names[] in sync.
181  */
182 #define pure_initcall(fn)               __define_initcall(fn, 0)
183 
184 #define core_initcall(fn)               __define_initcall(fn, 1)
185 #define core_initcall_sync(fn)          __define_initcall(fn, 1s)
186 #define postcore_initcall(fn)           __define_initcall(fn, 2)
187 #define postcore_initcall_sync(fn)      __define_initcall(fn, 2s)
188 #define arch_initcall(fn)               __define_initcall(fn, 3)
189 #define arch_initcall_sync(fn)          __define_initcall(fn, 3s)
190 #define subsys_initcall(fn)             __define_initcall(fn, 4)
191 #define subsys_initcall_sync(fn)        __define_initcall(fn, 4s)
192 #define fs_initcall(fn)                 __define_initcall(fn, 5)
193 #define fs_initcall_sync(fn)            __define_initcall(fn, 5s)
194 #define rootfs_initcall(fn)             __define_initcall(fn, rootfs)
195 #define device_initcall(fn)             __define_initcall(fn, 6)
196 #define device_initcall_sync(fn)        __define_initcall(fn, 6s)
197 #define late_initcall(fn)               __define_initcall(fn, 7)
198 #define late_initcall_sync(fn)          __define_initcall(fn, 7s)
199 
200 #define __initcall(fn) device_initcall(fn)
201 
202 #define __exitcall(fn)                                          \
203         static exitcall_t __exitcall_##fn __exit_call = fn
204 
205 #define console_initcall(fn)                                    \
206         static initcall_t __initcall_##fn                       \
207         __used __section(.con_initcall.init) = fn
208 
209 #define security_initcall(fn)                                   \
210         static initcall_t __initcall_##fn                       \
211         __used __section(.security_initcall.init) = fn
212 
213 struct obs_kernel_param {
214         const char *str;
215         int (*setup_func)(char *);
216         int early;
217 };
218 
219 /*
220  * Only for really core code.  See moduleparam.h for the normal way.
221  *
222  * Force the alignment so the compiler doesn't space elements of the
223  * obs_kernel_param "array" too far apart in .init.setup.
224  */
225 #define __setup_param(str, unique_id, fn, early)                        \
226         static const char __setup_str_##unique_id[] __initconst         \
227                 __aligned(1) = str;                                     \
228         static struct obs_kernel_param __setup_##unique_id              \
229                 __used __section(.init.setup)                           \
230                 __attribute__((aligned((sizeof(long)))))                \
231                 = { __setup_str_##unique_id, fn, early }
232 
233 #define __setup(str, fn)                                                \
234         __setup_param(str, fn, fn, 0)
235 
236 /*
237  * NOTE: fn is as per module_param, not __setup!
238  * Emits warning if fn returns non-zero.
239  */
240 #define early_param(str, fn)                                            \
241         __setup_param(str, fn, fn, 1)
242 
243 #define early_param_on_off(str_on, str_off, var, config)                \
244                                                                         \
245         int var = IS_ENABLED(config);                                   \
246                                                                         \
247         static int __init parse_##var##_on(char *arg)                   \
248         {                                                               \
249                 var = 1;                                                \
250                 return 0;                                               \
251         }                                                               \
252         __setup_param(str_on, parse_##var##_on, parse_##var##_on, 1);   \
253                                                                         \
254         static int __init parse_##var##_off(char *arg)                  \
255         {                                                               \
256                 var = 0;                                                \
257                 return 0;                                               \
258         }                                                               \
259         __setup_param(str_off, parse_##var##_off, parse_##var##_off, 1)
260 
261 /* Relies on boot_command_line being set */
262 void __init parse_early_param(void);
263 void __init parse_early_options(char *cmdline);
264 #endif /* __ASSEMBLY__ */
265 
266 #else /* MODULE */
267 
268 #define __setup_param(str, unique_id, fn)       /* nothing */
269 #define __setup(str, func)                      /* nothing */
270 #endif
271 
272 /* Data marked not to be saved by software suspend */
273 #define __nosavedata __section(.data..nosave)
274 
275 #ifdef MODULE
276 #define __exit_p(x) x
277 #else
278 #define __exit_p(x) NULL
279 #endif
280 
281 #endif /* _LINUX_INIT_H */
282 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp