[mirror_ubuntu-jammy-kernel.git] / include / linux / init.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_INIT_H
#define _LINUX_INIT_H

#include <linux/compiler.h>
#include <linux/types.h>

/* Built-in __init functions needn't be compiled with retpoline */
#if defined(__noretpoline) && !defined(MODULE)
#define __noinitretpoline __noretpoline
#else
#define __noinitretpoline
#endif

/* These macros are used to mark some functions or 
 * initialized data (doesn't apply to uninitialized data)
 * as `initialization' functions. The kernel can take this
 * as hint that the function is used only during the initialization
 * phase and free up used memory resources after
 *
 * Usage:
 * For functions:
 * 
 * You should add __init immediately before the function name, like:
 *
 * static void __init initme(int x, int y)
 * {
 *    extern int z; z = x * y;
 * }
 *
 * If the function has a prototype somewhere, you can also add
 * __init between closing brace of the prototype and semicolon:
 *
 * extern int initialize_foobar_device(int, int, int) __init;
 *
 * For initialized data:
 * You should insert __initdata or __initconst between the variable name
 * and equal sign followed by value, e.g.:
 *
 * static int init_variable __initdata = 0;
 * static const char linux_logo[] __initconst = { 0x32, 0x36, ... };
 *
 * Don't forget to initialize data not at file scope, i.e. within a function,
 * as gcc otherwise puts the data into the bss section and not into the init
 * section.
 */

/* These are for everybody (although not all archs will actually
   discard it in modules) */
#define __init		__section(".init.text") __cold  __latent_entropy __noinitretpoline __nocfi
#define __initdata	__section(".init.data")
#define __initconst	__section(".init.rodata")
#define __exitdata	__section(".exit.data")
#define __exit_call	__used __section(".exitcall.exit")

/*
 * modpost check for section mismatches during the kernel build.
 * A section mismatch happens when there are references from a
 * code or data section to an init section (both code or data).
 * The init sections are (for most archs) discarded by the kernel
 * when early init has completed so all such references are potential bugs.
 * For exit sections the same issue exists.
 *
 * The following markers are used for the cases where the reference to
 * the *init / *exit section (code or data) is valid and will teach
 * modpost not to issue a warning.  Intended semantics is that a code or
 * data tagged __ref* can reference code or data from init section without
 * producing a warning (of course, no warning does not mean code is
 * correct, so optimally document why the __ref is needed and why it's OK).
 *
 * The markers follow same syntax rules as __init / __initdata.
 */
#define __ref            __section(".ref.text") noinline
#define __refdata        __section(".ref.data")
#define __refconst       __section(".ref.rodata")

#ifdef MODULE
#define __exitused
#else
#define __exitused  __used
#endif

#define __exit          __section(".exit.text") __exitused __cold notrace

/* Used for MEMORY_HOTPLUG */
#define __meminit        __section(".meminit.text") __cold notrace \
						  __latent_entropy
#define __meminitdata    __section(".meminit.data")
#define __meminitconst   __section(".meminit.rodata")
#define __memexit        __section(".memexit.text") __exitused __cold notrace
#define __memexitdata    __section(".memexit.data")
#define __memexitconst   __section(".memexit.rodata")

/* For assembly routines */
#define __HEAD		.section	".head.text","ax"
#define __INIT		.section	".init.text","ax"
#define __FINIT		.previous

#define __INITDATA	.section	".init.data","aw",%progbits
#define __INITRODATA	.section	".init.rodata","a",%progbits
#define __FINITDATA	.previous

#define __MEMINIT        .section	".meminit.text", "ax"
#define __MEMINITDATA    .section	".meminit.data", "aw"
#define __MEMINITRODATA  .section	".meminit.rodata", "a"

/* silence warnings when references are OK */
#define __REF            .section       ".ref.text", "ax"
#define __REFDATA        .section       ".ref.data", "aw"
#define __REFCONST       .section       ".ref.rodata", "a"

#ifndef __ASSEMBLY__
/*
 * Used for initialization calls..
 */
typedef int (*initcall_t)(void);
typedef void (*exitcall_t)(void);

#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
typedef int initcall_entry_t;

static inline initcall_t initcall_from_entry(initcall_entry_t *entry)
{
	return offset_to_ptr(entry);
}
#else
typedef initcall_t initcall_entry_t;

static inline initcall_t initcall_from_entry(initcall_entry_t *entry)
{
	return *entry;
}
#endif

extern initcall_entry_t __con_initcall_start[], __con_initcall_end[];

/* Used for contructor calls. */
typedef void (*ctor_fn_t)(void);

struct file_system_type;

/* Defined in init/main.c */
extern int do_one_initcall(initcall_t fn);
extern char __initdata boot_command_line[];
extern char *saved_command_line;
extern unsigned int reset_devices;

/* used by init/main.c */
void setup_arch(char **);
void prepare_namespace(void);
void __init init_rootfs(void);
extern struct file_system_type rootfs_fs_type;

#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
extern bool rodata_enabled;
#endif
#ifdef CONFIG_STRICT_KERNEL_RWX
void mark_rodata_ro(void);
#endif

extern void (*late_time_init)(void);

extern bool initcall_debug;

#endif
  
#ifndef MODULE

#ifndef __ASSEMBLY__

/*
 * initcalls are now grouped by functionality into separate
 * subsections. Ordering inside the subsections is determined
 * by link order. 
 * For backwards compatibility, initcall() puts the call in 
 * the device init subsection.
 *
 * The `id' arg to __define_initcall() is needed so that multiple initcalls
 * can point at the same handler without causing duplicate-symbol build errors.
 *
 * Initcalls are run by placing pointers in initcall sections that the
 * kernel iterates at runtime. The linker can do dead code / data elimination
 * and remove that completely, so the initcall sections have to be marked
 * as KEEP() in the linker script.
 */

/* Format: <modname>__<counter>_<line>_<fn> */
#define __initcall_id(fn)					\
	__PASTE(__KBUILD_MODNAME,				\
	__PASTE(__,						\
	__PASTE(__COUNTER__,					\
	__PASTE(_,						\
	__PASTE(__LINE__,					\
	__PASTE(_, fn))))))

/* Format: __<prefix>__<iid><id> */
#define __initcall_name(prefix, __iid, id)			\
	__PASTE(__,						\
	__PASTE(prefix,						\
	__PASTE(__,						\
	__PASTE(__iid, id))))

#ifdef CONFIG_LTO_CLANG
/*
 * With LTO, the compiler doesn't necessarily obey link order for
 * initcalls. In order to preserve the correct order, we add each
 * variable into its own section and generate a linker script (in
 * scripts/link-vmlinux.sh) to specify the order of the sections.
 */
#define __initcall_section(__sec, __iid)			\
	#__sec ".init.." #__iid

/*
 * With LTO, the compiler can rename static functions to avoid
 * global naming collisions. We use a global stub function for
 * initcalls to create a stable symbol name whose address can be
 * taken in inline assembly when PREL32 relocations are used.
 */
#define __initcall_stub(fn, __iid, id)				\
	__initcall_name(initstub, __iid, id)

#define __define_initcall_stub(__stub, fn)			\
	int __init __cficanonical __stub(void);			\
	int __init __cficanonical __stub(void)			\
	{ 							\
		return fn();					\
	}							\
	__ADDRESSABLE(__stub)
#else
#define __initcall_section(__sec, __iid)			\
	#__sec ".init"

#define __initcall_stub(fn, __iid, id)	fn

#define __define_initcall_stub(__stub, fn)			\
	__ADDRESSABLE(fn)
#endif

#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
#define ____define_initcall(fn, __stub, __name, __sec)		\
	__define_initcall_stub(__stub, fn)			\
	asm(".section	\"" __sec "\", \"a\"		\n"	\
	    __stringify(__name) ":			\n"	\
	    ".long	" __stringify(__stub) " - .	\n"	\
	    ".previous					\n");	\
	static_assert(__same_type(initcall_t, &fn));
#else
#define ____define_initcall(fn, __unused, __name, __sec)	\
	static initcall_t __name __used 			\
		__attribute__((__section__(__sec))) = fn;
#endif

#define __unique_initcall(fn, id, __sec, __iid)			\
	____define_initcall(fn,					\
		__initcall_stub(fn, __iid, id),			\
		__initcall_name(initcall, __iid, id),		\
		__initcall_section(__sec, __iid))

#define ___define_initcall(fn, id, __sec)			\
	__unique_initcall(fn, id, __sec, __initcall_id(fn))

#define __define_initcall(fn, id) ___define_initcall(fn, id, .initcall##id)

/*
 * Early initcalls run before initializing SMP.
 *
 * Only for built-in code, not modules.
 */
#define early_initcall(fn)		__define_initcall(fn, early)

/*
 * A "pure" initcall has no dependencies on anything else, and purely
 * initializes variables that couldn't be statically initialized.
 *
 * This only exists for built-in code, not for modules.
 * Keep main.c:initcall_level_names[] in sync.
 */
#define pure_initcall(fn)		__define_initcall(fn, 0)

#define core_initcall(fn)		__define_initcall(fn, 1)
#define core_initcall_sync(fn)		__define_initcall(fn, 1s)
#define postcore_initcall(fn)		__define_initcall(fn, 2)
#define postcore_initcall_sync(fn)	__define_initcall(fn, 2s)
#define arch_initcall(fn)		__define_initcall(fn, 3)
#define arch_initcall_sync(fn)		__define_initcall(fn, 3s)
#define subsys_initcall(fn)		__define_initcall(fn, 4)
#define subsys_initcall_sync(fn)	__define_initcall(fn, 4s)
#define fs_initcall(fn)			__define_initcall(fn, 5)
#define fs_initcall_sync(fn)		__define_initcall(fn, 5s)
#define rootfs_initcall(fn)		__define_initcall(fn, rootfs)
#define device_initcall(fn)		__define_initcall(fn, 6)
#define device_initcall_sync(fn)	__define_initcall(fn, 6s)
#define late_initcall(fn)		__define_initcall(fn, 7)
#define late_initcall_sync(fn)		__define_initcall(fn, 7s)

#define __initcall(fn) device_initcall(fn)

#define __exitcall(fn)						\
	static exitcall_t __exitcall_##fn __exit_call = fn

#define console_initcall(fn)	___define_initcall(fn, con, .con_initcall)

struct obs_kernel_param {
	const char *str;
	int (*setup_func)(char *);
	int early;
};

/*
 * Only for really core code.  See moduleparam.h for the normal way.
 *
 * Force the alignment so the compiler doesn't space elements of the
 * obs_kernel_param "array" too far apart in .init.setup.
 */
#define __setup_param(str, unique_id, fn, early)			\
	static const char __setup_str_##unique_id[] __initconst		\
		__aligned(1) = str; 					\
	static struct obs_kernel_param __setup_##unique_id		\
		__used __section(".init.setup")				\
		__aligned(__alignof__(struct obs_kernel_param))		\
		= { __setup_str_##unique_id, fn, early }

#define __setup(str, fn)						\
	__setup_param(str, fn, fn, 0)

/*
 * NOTE: fn is as per module_param, not __setup!
 * Emits warning if fn returns non-zero.
 */
#define early_param(str, fn)						\
	__setup_param(str, fn, fn, 1)

#define early_param_on_off(str_on, str_off, var, config)		\
									\
	int var = IS_ENABLED(config);					\
									\
	static int __init parse_##var##_on(char *arg)			\
	{								\
		var = 1;						\
		return 0;						\
	}								\
	early_param(str_on, parse_##var##_on);				\
									\
	static int __init parse_##var##_off(char *arg)			\
	{								\
		var = 0;						\
		return 0;						\
	}								\
	early_param(str_off, parse_##var##_off)

/* Relies on boot_command_line being set */
void __init parse_early_param(void);
void __init parse_early_options(char *cmdline);
#endif /* __ASSEMBLY__ */

#else /* MODULE */

#define __setup_param(str, unique_id, fn)	/* nothing */
#define __setup(str, func) 			/* nothing */
#endif

/* Data marked not to be saved by software suspend */
#define __nosavedata __section(".data..nosave")

#ifdef MODULE
#define __exit_p(x) x
#else
#define __exit_p(x) NULL
#endif

#endif /* _LINUX_INIT_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _LINUX_INIT_H
	3	#define _LINUX_INIT_H
	4
1da177e4	5	#include <linux/compiler.h>
2329abfa	6	#include <linux/types.h>
1da177e4	7
66f79309	8	/* Built-in __init functions needn't be compiled with retpoline */
87358710 DW	9	#if defined(__noretpoline) && !defined(MODULE)
87358710 DW	10	#define __noinitretpoline __noretpoline
66f79309	11	#else
87358710	12	#define __noinitretpoline
66f79309 DW	13	#endif
66f79309 DW	14
1da177e4 LT	15	/* These macros are used to mark some functions or
	16	* initialized data (doesn't apply to uninitialized data)
	17	* as `initialization' functions. The kernel can take this
	18	* as hint that the function is used only during the initialization
	19	* phase and free up used memory resources after
	20	*
	21	* Usage:
	22	* For functions:
	23	*
	24	* You should add __init immediately before the function name, like:
	25	*
	26	* static void __init initme(int x, int y)
	27	* {
	28	* extern int z; z = x * y;
	29	* }
	30	*
	31	* If the function has a prototype somewhere, you can also add
	32	* __init between closing brace of the prototype and semicolon:
	33	*
	34	* extern int initialize_foobar_device(int, int, int) __init;
	35	*
	36	* For initialized data:
65321547 GU	37	* You should insert __initdata or __initconst between the variable name
65321547 GU	38	* and equal sign followed by value, e.g.:
1da177e4 LT	39	*
1da177e4 LT	40	* static int init_variable __initdata = 0;
ae52bb23	41	* static const char linux_logo[] __initconst = { 0x32, 0x36, ... };
1da177e4 LT	42	*
	43	* Don't forget to initialize data not at file scope, i.e. within a function,
	44	* as gcc otherwise puts the data into the bss section and not into the init
	45	* section.
1da177e4 LT	46	*/
	47
	48	/* These are for everybody (although not all archs will actually
	49	discard it in modules) */
cf68fffb	50	#define __init __section(".init.text") __cold __latent_entropy __noinitretpoline __nocfi
33def849 JP	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")
1da177e4	55
5ea08178 MN	56	/*
5ea08178 MN	57	* modpost check for section mismatches during the kernel build.
0e0d314e SR	58	* A section mismatch happens when there are references from a
	59	* code or data section to an init section (both code or data).
	60	* The init sections are (for most archs) discarded by the kernel
	61	* when early init has completed so all such references are potential bugs.
	62	* For exit sections the same issue exists.
5ea08178	63	*
0e0d314e	64	* The following markers are used for the cases where the reference to
312b1485	65	* the init / exit section (code or data) is valid and will teach
5ea08178 MN	66	* modpost not to issue a warning. Intended semantics is that a code or
	67	* data tagged __ref* can reference code or data from init section without
	68	* producing a warning (of course, no warning does not mean code is
	69	* correct, so optimally document why the __ref is needed and why it's OK).
	70	*
	71	* The markers follow same syntax rules as __init / __initdata.
	72	*/
33def849 JP	73	#define __ref __section(".ref.text") noinline
	74	#define __refdata __section(".ref.data")
	75	#define __refconst __section(".ref.rodata")
312b1485	76
1da177e4	77	#ifdef MODULE
eb8f6890	78	#define __exitused
1da177e4	79	#else
eb8f6890	80	#define __exitused __used
1da177e4 LT	81	#endif
1da177e4 LT	82
33def849	83	#define __exit __section(".exit.text") __exitused __cold notrace
eb8f6890	84
eb8f6890	85	/* Used for MEMORY_HOTPLUG */
33def849	86	#define __meminit __section(".meminit.text") __cold notrace \
0766f788	87	__latent_entropy
33def849 JP	88	#define __meminitdata __section(".meminit.data")
	89	#define __meminitconst __section(".meminit.rodata")
	90	#define __memexit __section(".memexit.text") __exitused __cold notrace
	91	#define __memexitdata __section(".memexit.data")
	92	#define __memexitconst __section(".memexit.rodata")
eb8f6890	93
1da177e4	94	/* For assembly routines */
7923f90f	95	#define __HEAD .section ".head.text","ax"
1da177e4	96	#define __INIT .section ".init.text","ax"
86c0baf1	97	#define __FINIT .previous
eb8f6890	98
8b5a10fc JB	99	#define __INITDATA .section ".init.data","aw",%progbits
8b5a10fc JB	100	#define __INITRODATA .section ".init.rodata","a",%progbits
9f9975a5	101	#define __FINITDATA .previous
1da177e4	102
eb8f6890 SR	103	#define __MEMINIT .section ".meminit.text", "ax"
eb8f6890 SR	104	#define __MEMINITDATA .section ".meminit.data", "aw"
3f5e26ce	105	#define __MEMINITRODATA .section ".meminit.rodata", "a"
eb8f6890	106
312b1485 SR	107	/* silence warnings when references are OK */
	108	#define __REF .section ".ref.text", "ax"
	109	#define __REFDATA .section ".ref.data", "aw"
3f5e26ce	110	#define __REFCONST .section ".ref.rodata", "a"
312b1485	111
1da177e4 LT	112	#ifndef __ASSEMBLY__
	113	/*
	114	* Used for initialization calls..
	115	*/
	116	typedef int (*initcall_t)(void);
	117	typedef void (*exitcall_t)(void);
	118
1b1eeca7 AB	119	#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
	120	typedef int initcall_entry_t;
	121
	122	static inline initcall_t initcall_from_entry(initcall_entry_t *entry)
	123	{
	124	return offset_to_ptr(entry);
	125	}
	126	#else
	127	typedef initcall_t initcall_entry_t;
	128
	129	static inline initcall_t initcall_from_entry(initcall_entry_t *entry)
	130	{
	131	return *entry;
	132	}
	133	#endif
	134
	135	extern initcall_entry_t __con_initcall_start[], __con_initcall_end[];
1da177e4	136
b99b87f7 PO	137	/* Used for contructor calls. */
	138	typedef void (*ctor_fn_t)(void);
	139
fd3e007f AV	140	struct file_system_type;
fd3e007f AV	141
1da177e4	142	/* Defined in init/main.c */
59f9415f	143	extern int do_one_initcall(initcall_t fn);
30d7e0d4 ABL	144	extern char __initdata boot_command_line[];
30d7e0d4 ABL	145	extern char *saved_command_line;
7e96287d	146	extern unsigned int reset_devices;
77d47582 AB	147
77d47582 AB	148	/* used by init/main.c */
46595390 AB	149	void setup_arch(char **);
46595390 AB	150	void prepare_namespace(void);
037f11b4	151	void __init init_rootfs(void);
fd3e007f	152	extern struct file_system_type rootfs_fs_type;
77d47582	153
0f5bf6d0	154	#if defined(CONFIG_STRICT_KERNEL_RWX) \|\| defined(CONFIG_STRICT_MODULE_RWX)
39290b38 AT	155	extern bool rodata_enabled;
39290b38 AT	156	#endif
0f5bf6d0	157	#ifdef CONFIG_STRICT_KERNEL_RWX
e267d97b KC	158	void mark_rodata_ro(void);
	159	#endif
	160
7d195a54 AB	161	extern void (*late_time_init)(void);
7d195a54 AB	162
2329abfa	163	extern bool initcall_debug;
f2511774	164
1da177e4 LT	165	#endif
	166
	167	#ifndef MODULE
	168
	169	#ifndef __ASSEMBLY__
	170
b67067f1 NP	171	/*
b67067f1 NP	172	* initcalls are now grouped by functionality into separate
1da177e4 LT	173	* subsections. Ordering inside the subsections is determined
	174	* by link order.
	175	* For backwards compatibility, initcall() puts the call in
	176	* the device init subsection.
735a7ffb AM	177	*
	178	* The `id' arg to __define_initcall() is needed so that multiple initcalls
	179	* can point at the same handler without causing duplicate-symbol build errors.
b67067f1 NP	180	*
	181	* Initcalls are run by placing pointers in initcall sections that the
	182	* kernel iterates at runtime. The linker can do dead code / data elimination
	183	* and remove that completely, so the initcall sections have to be marked
	184	* as KEEP() in the linker script.
1da177e4 LT	185	*/
1da177e4 LT	186
a8cccdd9 ST	187	/* Format: <modname>__<counter>_<line>_<fn> */
	188	#define __initcall_id(fn) \
	189	__PASTE(__KBUILD_MODNAME, \
	190	__PASTE(__, \
	191	__PASTE(__COUNTER__, \
	192	__PASTE(_, \
	193	__PASTE(__LINE__, \
	194	__PASTE(_, fn))))))
	195
	196	/* Format: __<prefix>__<iid><id> */
	197	#define __initcall_name(prefix, __iid, id) \
	198	__PASTE(__, \
	199	__PASTE(prefix, \
	200	__PASTE(__, \
	201	__PASTE(__iid, id))))
	202
	203	#ifdef CONFIG_LTO_CLANG
	204	/*
	205	* With LTO, the compiler doesn't necessarily obey link order for
	206	* initcalls. In order to preserve the correct order, we add each
	207	* variable into its own section and generate a linker script (in
	208	* scripts/link-vmlinux.sh) to specify the order of the sections.
	209	*/
	210	#define __initcall_section(__sec, __iid) \
	211	#__sec ".init.." #__iid
3578ad11 ST	212
	213	/*
	214	* With LTO, the compiler can rename static functions to avoid
	215	* global naming collisions. We use a global stub function for
	216	* initcalls to create a stable symbol name whose address can be
	217	* taken in inline assembly when PREL32 relocations are used.
	218	*/
	219	#define __initcall_stub(fn, __iid, id) \
	220	__initcall_name(initstub, __iid, id)
	221
	222	#define __define_initcall_stub(__stub, fn) \
ff301ceb ST	223	int __init __cficanonical __stub(void); \
ff301ceb ST	224	int __init __cficanonical __stub(void) \
3578ad11 ST	225	{ \
	226	return fn(); \
	227	} \
	228	__ADDRESSABLE(__stub)
a8cccdd9 ST	229	#else
	230	#define __initcall_section(__sec, __iid) \
	231	#__sec ".init"
3578ad11 ST	232
	233	#define __initcall_stub(fn, __iid, id) fn
	234
	235	#define __define_initcall_stub(__stub, fn) \
	236	__ADDRESSABLE(fn)
a8cccdd9 ST	237	#endif
a8cccdd9 ST	238
1b1eeca7	239	#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
3578ad11 ST	240	#define ____define_initcall(fn, __stub, __name, __sec) \
3578ad11 ST	241	__define_initcall_stub(__stub, fn) \
a8cccdd9 ST	242	asm(".section \"" __sec "\", \"a\" \n" \
a8cccdd9 ST	243	__stringify(__name) ": \n" \
3578ad11	244	".long " __stringify(__stub) " - . \n" \
1cb61759 ME	245	".previous \n"); \
1cb61759 ME	246	static_assert(__same_type(initcall_t, &fn));
1b1eeca7	247	#else
3578ad11	248	#define ____define_initcall(fn, __unused, __name, __sec) \
a8cccdd9 ST	249	static initcall_t __name __used \
a8cccdd9 ST	250	__attribute__((__section__(__sec))) = fn;
1b1eeca7 AB	251	#endif
1b1eeca7 AB	252
a8cccdd9 ST	253	#define __unique_initcall(fn, id, __sec, __iid) \
a8cccdd9 ST	254	____define_initcall(fn, \
3578ad11	255	__initcall_stub(fn, __iid, id), \
a8cccdd9 ST	256	__initcall_name(initcall, __iid, id), \
	257	__initcall_section(__sec, __iid))
	258
	259	#define ___define_initcall(fn, id, __sec) \
	260	__unique_initcall(fn, id, __sec, __initcall_id(fn))
	261
1b1eeca7	262	#define __define_initcall(fn, id) ___define_initcall(fn, id, .initcall##id)
1da177e4	263
c2147a50 EGM	264	/*
	265	* Early initcalls run before initializing SMP.
	266	*
	267	* Only for built-in code, not modules.
	268	*/
7929d407	269	#define early_initcall(fn) __define_initcall(fn, early)
c2147a50	270
b3438f82 LT	271	/*
	272	* A "pure" initcall has no dependencies on anything else, and purely
	273	* initializes variables that couldn't be statically initialized.
	274	*
	275	* This only exists for built-in code, not for modules.
96263d28	276	* Keep main.c:initcall_level_names[] in sync.
b3438f82	277	*/
7929d407 ML	278	#define pure_initcall(fn) __define_initcall(fn, 0)
	279
	280	#define core_initcall(fn) __define_initcall(fn, 1)
	281	#define core_initcall_sync(fn) __define_initcall(fn, 1s)
	282	#define postcore_initcall(fn) __define_initcall(fn, 2)
	283	#define postcore_initcall_sync(fn) __define_initcall(fn, 2s)
	284	#define arch_initcall(fn) __define_initcall(fn, 3)
	285	#define arch_initcall_sync(fn) __define_initcall(fn, 3s)
	286	#define subsys_initcall(fn) __define_initcall(fn, 4)
	287	#define subsys_initcall_sync(fn) __define_initcall(fn, 4s)
	288	#define fs_initcall(fn) __define_initcall(fn, 5)
	289	#define fs_initcall_sync(fn) __define_initcall(fn, 5s)
	290	#define rootfs_initcall(fn) __define_initcall(fn, rootfs)
	291	#define device_initcall(fn) __define_initcall(fn, 6)
	292	#define device_initcall_sync(fn) __define_initcall(fn, 6s)
	293	#define late_initcall(fn) __define_initcall(fn, 7)
	294	#define late_initcall_sync(fn) __define_initcall(fn, 7s)
1da177e4 LT	295
	296	#define __initcall(fn) device_initcall(fn)
	297
b67067f1	298	#define __exitcall(fn) \
1da177e4 LT	299	static exitcall_t __exitcall_##fn __exit_call = fn
1da177e4 LT	300
a8cccdd9	301	#define console_initcall(fn) ___define_initcall(fn, con, .con_initcall)
1da177e4 LT	302
	303	struct obs_kernel_param {
	304	const char *str;
	305	int (setup_func)(char );
	306	int early;
	307	};
	308
	309	/*
	310	* Only for really core code. See moduleparam.h for the normal way.
	311	*
	312	* Force the alignment so the compiler doesn't space elements of the
	313	* obs_kernel_param "array" too far apart in .init.setup.
	314	*/
	315	#define __setup_param(str, unique_id, fn, early) \
c281b945 IM	316	static const char __setup_str_##unique_id[] __initconst \
	317	__aligned(1) = str; \
	318	static struct obs_kernel_param __setup_##unique_id \
33def849	319	__used __section(".init.setup") \
147ad605	320	__aligned(__alignof__(struct obs_kernel_param)) \
1da177e4 LT	321	= { __setup_str_##unique_id, fn, early }
1da177e4 LT	322
c281b945	323	#define __setup(str, fn) \
1da177e4 LT	324	__setup_param(str, fn, fn, 0)
1da177e4 LT	325
c281b945 IM	326	/*
	327	* NOTE: fn is as per module_param, not __setup!
	328	* Emits warning if fn returns non-zero.
	329	*/
	330	#define early_param(str, fn) \
1da177e4 LT	331	__setup_param(str, fn, fn, 1)
1da177e4 LT	332
c281b945 IM	333	#define early_param_on_off(str_on, str_off, var, config) \
	334	\
	335	int var = IS_ENABLED(config); \
	336	\
	337	static int __init parse_##var##_on(char *arg) \
	338	{ \
	339	var = 1; \
	340	return 0; \
	341	} \
a5a673f7	342	early_param(str_on, parse_##var##_on); \
c281b945 IM	343	\
	344	static int __init parse_##var##_off(char *arg) \
	345	{ \
	346	var = 0; \
	347	return 0; \
	348	} \
a5a673f7	349	early_param(str_off, parse_##var##_off)
bfb33bad	350
30d7e0d4	351	/* Relies on boot_command_line being set */
1da177e4	352	void __init parse_early_param(void);
13977091	353	void __init parse_early_options(char *cmdline);
1da177e4 LT	354	#endif /* __ASSEMBLY__ */
1da177e4 LT	355
1da177e4 LT	356	#else /* MODULE */
1da177e4 LT	357
1da177e4	358	#define __setup_param(str, unique_id, fn) /* nothing */
1da177e4	359	#define __setup(str, func) /* nothing */
1da177e4 LT	360	#endif
1da177e4 LT	361
ab3bfca7	362	/* Data marked not to be saved by software suspend */
33def849	363	#define __nosavedata __section(".data..nosave")
1da177e4	364
1da177e4 LT	365	#ifdef MODULE
	366	#define __exit_p(x) x
	367	#else
	368	#define __exit_p(x) NULL
	369	#endif
	370
	371	#endif /* _LINUX_INIT_H */