371 строка
11 KiB
C
371 строка
11 KiB
C
/* 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
|
|
#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 __stub(void); \
|
|
int __init __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");
|
|
#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 */
|