Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_INIT_H |
| 2 | #define _LINUX_INIT_H |
| 3 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | #include <linux/compiler.h> |
Rusty Russell | 2329abf | 2012-01-13 09:32:18 +1030 | [diff] [blame] | 5 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Geert Uytterhoeven | ae52bb2 | 2009-06-16 15:34:19 -0700 | [diff] [blame] | 33 | * static const char linux_logo[] __initconst = { 0x32, 0x36, ... }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) */ |
Steven Rostedt | fed1939 | 2008-08-14 22:47:19 -0400 | [diff] [blame] | 44 | #define __init __section(.init.text) __cold notrace |
Sam Ravnborg | f3fe866 | 2008-01-20 18:54:48 +0100 | [diff] [blame] | 45 | #define __initdata __section(.init.data) |
Andi Kleen | 754b7b6 | 2012-10-04 17:11:27 -0700 | [diff] [blame] | 46 | #define __initconst __constsection(.init.rodata) |
Sam Ravnborg | f3fe866 | 2008-01-20 18:54:48 +0100 | [diff] [blame] | 47 | #define __exitdata __section(.exit.data) |
Adrian Bunk | 3ff6eec | 2008-01-24 22:16:20 +0100 | [diff] [blame] | 48 | #define __exit_call __used __section(.exitcall.exit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Michal Nazarewicz | 5ea0817 | 2010-08-12 17:43:56 +0200 | [diff] [blame] | 50 | /* |
Andi Kleen | 754b7b6 | 2012-10-04 17:11:27 -0700 | [diff] [blame] | 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 | /* |
Michal Nazarewicz | 5ea0817 | 2010-08-12 17:43:56 +0200 | [diff] [blame] | 62 | * modpost check for section mismatches during the kernel build. |
Sam Ravnborg | 0e0d314 | 2007-05-17 20:14:48 +0200 | [diff] [blame] | 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. |
Michal Nazarewicz | 5ea0817 | 2010-08-12 17:43:56 +0200 | [diff] [blame] | 68 | * |
Sam Ravnborg | 0e0d314 | 2007-05-17 20:14:48 +0200 | [diff] [blame] | 69 | * The following markers are used for the cases where the reference to |
Sam Ravnborg | 312b148 | 2008-01-28 20:21:15 +0100 | [diff] [blame] | 70 | * the *init / *exit section (code or data) is valid and will teach |
Michal Nazarewicz | 5ea0817 | 2010-08-12 17:43:56 +0200 | [diff] [blame] | 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 | */ |
Sam Ravnborg | 312b148 | 2008-01-28 20:21:15 +0100 | [diff] [blame] | 78 | #define __ref __section(.ref.text) noinline |
| 79 | #define __refdata __section(.ref.data) |
Andi Kleen | 754b7b6 | 2012-10-04 17:11:27 -0700 | [diff] [blame] | 80 | #define __refconst __constsection(.ref.rodata) |
Sam Ravnborg | 312b148 | 2008-01-28 20:21:15 +0100 | [diff] [blame] | 81 | |
Sam Ravnborg | 312b148 | 2008-01-28 20:21:15 +0100 | [diff] [blame] | 82 | /* compatibility defines */ |
| 83 | #define __init_refok __ref |
| 84 | #define __initdata_refok __refdata |
| 85 | #define __exit_refok __ref |
| 86 | |
Sam Ravnborg | 0e0d314 | 2007-05-17 20:14:48 +0200 | [diff] [blame] | 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | #ifdef MODULE |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 89 | #define __exitused |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | #else |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 91 | #define __exitused __used |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | #endif |
| 93 | |
Steven Rostedt | f020173 | 2011-04-12 19:06:39 -0400 | [diff] [blame] | 94 | #define __exit __section(.exit.text) __exitused __cold notrace |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 95 | |
| 96 | /* Used for HOTPLUG */ |
Steven Rostedt | f020173 | 2011-04-12 19:06:39 -0400 | [diff] [blame] | 97 | #define __devinit __section(.devinit.text) __cold notrace |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 98 | #define __devinitdata __section(.devinit.data) |
Andi Kleen | 754b7b6 | 2012-10-04 17:11:27 -0700 | [diff] [blame] | 99 | #define __devinitconst __constsection(.devinit.rodata) |
Steven Rostedt | f020173 | 2011-04-12 19:06:39 -0400 | [diff] [blame] | 100 | #define __devexit __section(.devexit.text) __exitused __cold notrace |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 101 | #define __devexitdata __section(.devexit.data) |
Andi Kleen | 754b7b6 | 2012-10-04 17:11:27 -0700 | [diff] [blame] | 102 | #define __devexitconst __constsection(.devexit.rodata) |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 103 | |
| 104 | /* Used for HOTPLUG_CPU */ |
Steven Rostedt | f020173 | 2011-04-12 19:06:39 -0400 | [diff] [blame] | 105 | #define __cpuinit __section(.cpuinit.text) __cold notrace |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 106 | #define __cpuinitdata __section(.cpuinit.data) |
Andi Kleen | 754b7b6 | 2012-10-04 17:11:27 -0700 | [diff] [blame] | 107 | #define __cpuinitconst __constsection(.cpuinit.rodata) |
Steven Rostedt | f020173 | 2011-04-12 19:06:39 -0400 | [diff] [blame] | 108 | #define __cpuexit __section(.cpuexit.text) __exitused __cold notrace |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 109 | #define __cpuexitdata __section(.cpuexit.data) |
Andi Kleen | 754b7b6 | 2012-10-04 17:11:27 -0700 | [diff] [blame] | 110 | #define __cpuexitconst __constsection(.cpuexit.rodata) |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 111 | |
| 112 | /* Used for MEMORY_HOTPLUG */ |
Steven Rostedt | f020173 | 2011-04-12 19:06:39 -0400 | [diff] [blame] | 113 | #define __meminit __section(.meminit.text) __cold notrace |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 114 | #define __meminitdata __section(.meminit.data) |
Andi Kleen | 754b7b6 | 2012-10-04 17:11:27 -0700 | [diff] [blame] | 115 | #define __meminitconst __constsection(.meminit.rodata) |
Steven Rostedt | f020173 | 2011-04-12 19:06:39 -0400 | [diff] [blame] | 116 | #define __memexit __section(.memexit.text) __exitused __cold notrace |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 117 | #define __memexitdata __section(.memexit.data) |
Andi Kleen | 754b7b6 | 2012-10-04 17:11:27 -0700 | [diff] [blame] | 118 | #define __memexitconst __constsection(.memexit.rodata) |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | /* For assembly routines */ |
Sam Ravnborg | 7923f90 | 2009-06-14 22:10:41 +0200 | [diff] [blame] | 121 | #define __HEAD .section ".head.text","ax" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | #define __INIT .section ".init.text","ax" |
Prarit Bhargava | 86c0baf | 2007-05-02 19:27:05 +0200 | [diff] [blame] | 123 | #define __FINIT .previous |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 124 | |
Jan Beulich | 8b5a10f | 2009-08-19 08:40:48 +0100 | [diff] [blame] | 125 | #define __INITDATA .section ".init.data","aw",%progbits |
| 126 | #define __INITRODATA .section ".init.rodata","a",%progbits |
Ingo Molnar | 9f9975a | 2008-02-06 22:39:45 +0100 | [diff] [blame] | 127 | #define __FINITDATA .previous |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 129 | #define __DEVINIT .section ".devinit.text", "ax" |
| 130 | #define __DEVINITDATA .section ".devinit.data", "aw" |
Jan Beulich | 3f5e26c | 2008-10-25 15:02:51 -0700 | [diff] [blame] | 131 | #define __DEVINITRODATA .section ".devinit.rodata", "a" |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 132 | |
| 133 | #define __CPUINIT .section ".cpuinit.text", "ax" |
| 134 | #define __CPUINITDATA .section ".cpuinit.data", "aw" |
Jan Beulich | 3f5e26c | 2008-10-25 15:02:51 -0700 | [diff] [blame] | 135 | #define __CPUINITRODATA .section ".cpuinit.rodata", "a" |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 136 | |
| 137 | #define __MEMINIT .section ".meminit.text", "ax" |
| 138 | #define __MEMINITDATA .section ".meminit.data", "aw" |
Jan Beulich | 3f5e26c | 2008-10-25 15:02:51 -0700 | [diff] [blame] | 139 | #define __MEMINITRODATA .section ".meminit.rodata", "a" |
Sam Ravnborg | eb8f689 | 2008-01-20 20:07:28 +0100 | [diff] [blame] | 140 | |
Sam Ravnborg | 312b148 | 2008-01-28 20:21:15 +0100 | [diff] [blame] | 141 | /* silence warnings when references are OK */ |
| 142 | #define __REF .section ".ref.text", "ax" |
| 143 | #define __REFDATA .section ".ref.data", "aw" |
Jan Beulich | 3f5e26c | 2008-10-25 15:02:51 -0700 | [diff] [blame] | 144 | #define __REFCONST .section ".ref.rodata", "a" |
Sam Ravnborg | 312b148 | 2008-01-28 20:21:15 +0100 | [diff] [blame] | 145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | #ifndef __ASSEMBLY__ |
| 147 | /* |
| 148 | * Used for initialization calls.. |
| 149 | */ |
| 150 | typedef int (*initcall_t)(void); |
| 151 | typedef void (*exitcall_t)(void); |
| 152 | |
| 153 | extern initcall_t __con_initcall_start[], __con_initcall_end[]; |
| 154 | extern initcall_t __security_initcall_start[], __security_initcall_end[]; |
| 155 | |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 156 | /* Used for contructor calls. */ |
| 157 | typedef void (*ctor_fn_t)(void); |
| 158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | /* Defined in init/main.c */ |
Arjan van de Ven | 59f9415 | 2008-07-30 12:49:02 -0700 | [diff] [blame] | 160 | extern int do_one_initcall(initcall_t fn); |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 161 | extern char __initdata boot_command_line[]; |
| 162 | extern char *saved_command_line; |
Vivek Goyal | 7e96287 | 2006-09-27 01:50:44 -0700 | [diff] [blame] | 163 | extern unsigned int reset_devices; |
Adrian Bunk | 77d4758 | 2006-03-25 03:07:39 -0800 | [diff] [blame] | 164 | |
| 165 | /* used by init/main.c */ |
Adrian Bunk | 4659539 | 2007-05-08 00:24:47 -0700 | [diff] [blame] | 166 | void setup_arch(char **); |
| 167 | void prepare_namespace(void); |
Adrian Bunk | 77d4758 | 2006-03-25 03:07:39 -0800 | [diff] [blame] | 168 | |
Adrian Bunk | 7d195a5 | 2008-04-29 00:59:18 -0700 | [diff] [blame] | 169 | extern void (*late_time_init)(void); |
| 170 | |
Rusty Russell | 2329abf | 2012-01-13 09:32:18 +1030 | [diff] [blame] | 171 | extern bool initcall_debug; |
Arjan van de Ven | f251177 | 2009-12-13 20:29:01 +0100 | [diff] [blame] | 172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | #endif |
| 174 | |
| 175 | #ifndef MODULE |
| 176 | |
| 177 | #ifndef __ASSEMBLY__ |
| 178 | |
| 179 | /* initcalls are now grouped by functionality into separate |
| 180 | * subsections. Ordering inside the subsections is determined |
| 181 | * by link order. |
| 182 | * For backwards compatibility, initcall() puts the call in |
| 183 | * the device init subsection. |
Andrew Morton | 735a7ff | 2006-10-27 11:42:37 -0700 | [diff] [blame] | 184 | * |
| 185 | * The `id' arg to __define_initcall() is needed so that multiple initcalls |
| 186 | * can point at the same handler without causing duplicate-symbol build errors. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | */ |
| 188 | |
Andrew Morton | 735a7ff | 2006-10-27 11:42:37 -0700 | [diff] [blame] | 189 | #define __define_initcall(level,fn,id) \ |
Adrian Bunk | 3ff6eec | 2008-01-24 22:16:20 +0100 | [diff] [blame] | 190 | static initcall_t __initcall_##fn##id __used \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | __attribute__((__section__(".initcall" level ".init"))) = fn |
| 192 | |
Linus Torvalds | b3438f8 | 2006-11-20 11:47:18 -0800 | [diff] [blame] | 193 | /* |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 194 | * Early initcalls run before initializing SMP. |
| 195 | * |
| 196 | * Only for built-in code, not modules. |
| 197 | */ |
| 198 | #define early_initcall(fn) __define_initcall("early",fn,early) |
| 199 | |
| 200 | /* |
Linus Torvalds | b3438f8 | 2006-11-20 11:47:18 -0800 | [diff] [blame] | 201 | * A "pure" initcall has no dependencies on anything else, and purely |
| 202 | * initializes variables that couldn't be statically initialized. |
| 203 | * |
| 204 | * This only exists for built-in code, not for modules. |
Jim Cromie | 96263d2 | 2012-06-14 16:00:59 -0600 | [diff] [blame] | 205 | * Keep main.c:initcall_level_names[] in sync. |
Linus Torvalds | b3438f8 | 2006-11-20 11:47:18 -0800 | [diff] [blame] | 206 | */ |
Michael Buesch | 73dd116 | 2007-07-31 00:38:54 -0700 | [diff] [blame] | 207 | #define pure_initcall(fn) __define_initcall("0",fn,0) |
Linus Torvalds | b3438f8 | 2006-11-20 11:47:18 -0800 | [diff] [blame] | 208 | |
Andrew Morton | 735a7ff | 2006-10-27 11:42:37 -0700 | [diff] [blame] | 209 | #define core_initcall(fn) __define_initcall("1",fn,1) |
| 210 | #define core_initcall_sync(fn) __define_initcall("1s",fn,1s) |
| 211 | #define postcore_initcall(fn) __define_initcall("2",fn,2) |
| 212 | #define postcore_initcall_sync(fn) __define_initcall("2s",fn,2s) |
| 213 | #define arch_initcall(fn) __define_initcall("3",fn,3) |
| 214 | #define arch_initcall_sync(fn) __define_initcall("3s",fn,3s) |
| 215 | #define subsys_initcall(fn) __define_initcall("4",fn,4) |
| 216 | #define subsys_initcall_sync(fn) __define_initcall("4s",fn,4s) |
| 217 | #define fs_initcall(fn) __define_initcall("5",fn,5) |
| 218 | #define fs_initcall_sync(fn) __define_initcall("5s",fn,5s) |
Linus Torvalds | 8d610dd | 2006-12-11 12:12:04 -0800 | [diff] [blame] | 219 | #define rootfs_initcall(fn) __define_initcall("rootfs",fn,rootfs) |
Andrew Morton | 735a7ff | 2006-10-27 11:42:37 -0700 | [diff] [blame] | 220 | #define device_initcall(fn) __define_initcall("6",fn,6) |
| 221 | #define device_initcall_sync(fn) __define_initcall("6s",fn,6s) |
| 222 | #define late_initcall(fn) __define_initcall("7",fn,7) |
| 223 | #define late_initcall_sync(fn) __define_initcall("7s",fn,7s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
| 225 | #define __initcall(fn) device_initcall(fn) |
| 226 | |
| 227 | #define __exitcall(fn) \ |
| 228 | static exitcall_t __exitcall_##fn __exit_call = fn |
| 229 | |
| 230 | #define console_initcall(fn) \ |
| 231 | static initcall_t __initcall_##fn \ |
Adrian Bunk | 3ff6eec | 2008-01-24 22:16:20 +0100 | [diff] [blame] | 232 | __used __section(.con_initcall.init) = fn |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
| 234 | #define security_initcall(fn) \ |
| 235 | static initcall_t __initcall_##fn \ |
Adrian Bunk | 3ff6eec | 2008-01-24 22:16:20 +0100 | [diff] [blame] | 236 | __used __section(.security_initcall.init) = fn |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
| 238 | struct obs_kernel_param { |
| 239 | const char *str; |
| 240 | int (*setup_func)(char *); |
| 241 | int early; |
| 242 | }; |
| 243 | |
| 244 | /* |
| 245 | * Only for really core code. See moduleparam.h for the normal way. |
| 246 | * |
| 247 | * Force the alignment so the compiler doesn't space elements of the |
| 248 | * obs_kernel_param "array" too far apart in .init.setup. |
| 249 | */ |
| 250 | #define __setup_param(str, unique_id, fn, early) \ |
Jan Beulich | fd6c3a8 | 2009-03-12 10:58:33 +0000 | [diff] [blame] | 251 | static const char __setup_str_##unique_id[] __initconst \ |
| 252 | __aligned(1) = str; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | static struct obs_kernel_param __setup_##unique_id \ |
Adrian Bunk | 3ff6eec | 2008-01-24 22:16:20 +0100 | [diff] [blame] | 254 | __used __section(.init.setup) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | __attribute__((aligned((sizeof(long))))) \ |
| 256 | = { __setup_str_##unique_id, fn, early } |
| 257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | #define __setup(str, fn) \ |
| 259 | __setup_param(str, fn, fn, 0) |
| 260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | /* NOTE: fn is as per module_param, not __setup! Emits warning if fn |
| 262 | * returns non-zero. */ |
| 263 | #define early_param(str, fn) \ |
| 264 | __setup_param(str, fn, fn, 1) |
| 265 | |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 266 | /* Relies on boot_command_line being set */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | void __init parse_early_param(void); |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 268 | void __init parse_early_options(char *cmdline); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | #endif /* __ASSEMBLY__ */ |
| 270 | |
| 271 | /** |
| 272 | * module_init() - driver initialization entry point |
| 273 | * @x: function to be run at kernel boot time or module insertion |
| 274 | * |
Robert P. J. Day | 72fd4a3 | 2007-02-10 01:45:59 -0800 | [diff] [blame] | 275 | * module_init() will either be called during do_initcalls() (if |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | * builtin) or at module insertion time (if a module). There can only |
| 277 | * be one per module. |
| 278 | */ |
| 279 | #define module_init(x) __initcall(x); |
| 280 | |
| 281 | /** |
| 282 | * module_exit() - driver exit entry point |
| 283 | * @x: function to be run when driver is removed |
| 284 | * |
| 285 | * module_exit() will wrap the driver clean-up code |
| 286 | * with cleanup_module() when used with rmmod when |
| 287 | * the driver is a module. If the driver is statically |
| 288 | * compiled into the kernel, module_exit() has no effect. |
| 289 | * There can only be one per module. |
| 290 | */ |
| 291 | #define module_exit(x) __exitcall(x); |
| 292 | |
| 293 | #else /* MODULE */ |
| 294 | |
Jim Cromie | 96263d2 | 2012-06-14 16:00:59 -0600 | [diff] [blame] | 295 | /* Don't use these in loadable modules, but some people do... */ |
Borislav Petkov | 329bd41 | 2009-10-02 15:23:21 +0200 | [diff] [blame] | 296 | #define early_initcall(fn) module_init(fn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | #define core_initcall(fn) module_init(fn) |
| 298 | #define postcore_initcall(fn) module_init(fn) |
| 299 | #define arch_initcall(fn) module_init(fn) |
| 300 | #define subsys_initcall(fn) module_init(fn) |
| 301 | #define fs_initcall(fn) module_init(fn) |
| 302 | #define device_initcall(fn) module_init(fn) |
| 303 | #define late_initcall(fn) module_init(fn) |
| 304 | |
| 305 | #define security_initcall(fn) module_init(fn) |
| 306 | |
Robert P. J. Day | 4500d06 | 2008-07-25 01:45:49 -0700 | [diff] [blame] | 307 | /* Each module must use one module_init(). */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | #define module_init(initfn) \ |
| 309 | static inline initcall_t __inittest(void) \ |
| 310 | { return initfn; } \ |
| 311 | int init_module(void) __attribute__((alias(#initfn))); |
| 312 | |
| 313 | /* This is only required if you want to be unloadable. */ |
| 314 | #define module_exit(exitfn) \ |
| 315 | static inline exitcall_t __exittest(void) \ |
| 316 | { return exitfn; } \ |
| 317 | void cleanup_module(void) __attribute__((alias(#exitfn))); |
| 318 | |
| 319 | #define __setup_param(str, unique_id, fn) /* nothing */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | #define __setup(str, func) /* nothing */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | #endif |
| 322 | |
Johannes Berg | ab3bfca | 2007-05-06 14:50:49 -0700 | [diff] [blame] | 323 | /* Data marked not to be saved by software suspend */ |
Denys Vlasenko | 07b3bb1 | 2010-02-20 01:03:52 +0100 | [diff] [blame] | 324 | #define __nosavedata __section(.data..nosave) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | |
| 326 | /* This means "can be init if no module support, otherwise module load |
| 327 | may call it." */ |
| 328 | #ifdef CONFIG_MODULES |
| 329 | #define __init_or_module |
| 330 | #define __initdata_or_module |
Jan Beulich | 8b5a10f | 2009-08-19 08:40:48 +0100 | [diff] [blame] | 331 | #define __initconst_or_module |
| 332 | #define __INIT_OR_MODULE .text |
| 333 | #define __INITDATA_OR_MODULE .data |
| 334 | #define __INITRODATA_OR_MODULE .section ".rodata","a",%progbits |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | #else |
| 336 | #define __init_or_module __init |
| 337 | #define __initdata_or_module __initdata |
Jan Beulich | 8b5a10f | 2009-08-19 08:40:48 +0100 | [diff] [blame] | 338 | #define __initconst_or_module __initconst |
| 339 | #define __INIT_OR_MODULE __INIT |
| 340 | #define __INITDATA_OR_MODULE __INITDATA |
| 341 | #define __INITRODATA_OR_MODULE __INITRODATA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | #endif /*CONFIG_MODULES*/ |
| 343 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | /* Functions marked as __devexit may be discarded at kernel link time, depending |
| 345 | on config options. Newer versions of binutils detect references from |
| 346 | retained sections to discarded sections and flag an error. Pointers to |
| 347 | __devexit functions must use __devexit_p(function_name), the wrapper will |
| 348 | insert either the function_name or NULL, depending on the config options. |
| 349 | */ |
| 350 | #if defined(MODULE) || defined(CONFIG_HOTPLUG) |
| 351 | #define __devexit_p(x) x |
| 352 | #else |
| 353 | #define __devexit_p(x) NULL |
| 354 | #endif |
| 355 | |
| 356 | #ifdef MODULE |
| 357 | #define __exit_p(x) x |
| 358 | #else |
| 359 | #define __exit_p(x) NULL |
| 360 | #endif |
| 361 | |
| 362 | #endif /* _LINUX_INIT_H */ |