301 lines
9.4 KiB
C
301 lines
9.4 KiB
C
#ifndef _LINUX_INIT_H
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#define _LINUX_INIT_H
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#include <linux/compiler.h>
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#include <linux/types.h>
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/* These macros are used to mark some functions or
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* initialized data (doesn't apply to uninitialized data)
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* as `initialization' functions. The kernel can take this
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* as hint that the function is used only during the initialization
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* phase and free up used memory resources after
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*
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* Usage:
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* For functions:
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*
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* You should add __init immediately before the function name, like:
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*
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* static void __init initme(int x, int y)
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* {
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* extern int z; z = x * y;
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* }
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*
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* If the function has a prototype somewhere, you can also add
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* __init between closing brace of the prototype and semicolon:
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*
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* extern int initialize_foobar_device(int, int, int) __init;
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*
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* For initialized data:
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* You should insert __initdata or __initconst between the variable name
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* and equal sign followed by value, e.g.:
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*
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* static int init_variable __initdata = 0;
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* static const char linux_logo[] __initconst = { 0x32, 0x36, ... };
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*
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* Don't forget to initialize data not at file scope, i.e. within a function,
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* as gcc otherwise puts the data into the bss section and not into the init
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* section.
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*/
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/* These are for everybody (although not all archs will actually
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discard it in modules) */
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#define __init __section(.init.text) __cold notrace
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#define __initdata __section(.init.data)
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#define __initconst __constsection(.init.rodata)
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#define __exitdata __section(.exit.data)
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#define __exit_call __used __section(.exitcall.exit)
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/*
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* Some architecture have tool chains which do not handle rodata attributes
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* correctly. For those disable special sections for const, so that other
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* architectures can annotate correctly.
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*/
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#ifdef CONFIG_BROKEN_RODATA
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#define __constsection(x)
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#else
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#define __constsection(x) __section(x)
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#endif
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/*
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* modpost check for section mismatches during the kernel build.
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* A section mismatch happens when there are references from a
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* code or data section to an init section (both code or data).
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* The init sections are (for most archs) discarded by the kernel
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* when early init has completed so all such references are potential bugs.
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* For exit sections the same issue exists.
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*
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* The following markers are used for the cases where the reference to
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* the *init / *exit section (code or data) is valid and will teach
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* modpost not to issue a warning. Intended semantics is that a code or
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* data tagged __ref* can reference code or data from init section without
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* producing a warning (of course, no warning does not mean code is
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* correct, so optimally document why the __ref is needed and why it's OK).
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*
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* The markers follow same syntax rules as __init / __initdata.
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*/
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#define __ref __section(.ref.text) noinline
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#define __refdata __section(.ref.data)
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#define __refconst __constsection(.ref.rodata)
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/* compatibility defines */
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#define __init_refok __ref
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#define __initdata_refok __refdata
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#define __exit_refok __ref
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#ifdef MODULE
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#define __exitused
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#else
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#define __exitused __used
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#endif
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#define __exit __section(.exit.text) __exitused __cold notrace
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/* Used for MEMORY_HOTPLUG */
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#define __meminit __section(.meminit.text) __cold notrace
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#define __meminitdata __section(.meminit.data)
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#define __meminitconst __constsection(.meminit.rodata)
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#define __memexit __section(.memexit.text) __exitused __cold notrace
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#define __memexitdata __section(.memexit.data)
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#define __memexitconst __constsection(.memexit.rodata)
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/* For assembly routines */
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#define __HEAD .section ".head.text","ax"
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#define __INIT .section ".init.text","ax"
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#define __FINIT .previous
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#define __INITDATA .section ".init.data","aw",%progbits
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#define __INITRODATA .section ".init.rodata","a",%progbits
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#define __FINITDATA .previous
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#define __MEMINIT .section ".meminit.text", "ax"
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#define __MEMINITDATA .section ".meminit.data", "aw"
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#define __MEMINITRODATA .section ".meminit.rodata", "a"
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/* silence warnings when references are OK */
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#define __REF .section ".ref.text", "ax"
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#define __REFDATA .section ".ref.data", "aw"
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#define __REFCONST .section ".ref.rodata", "a"
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#ifndef __ASSEMBLY__
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/*
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* Used for initialization calls..
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*/
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typedef int (*initcall_t)(void);
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typedef void (*exitcall_t)(void);
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extern initcall_t __con_initcall_start[], __con_initcall_end[];
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extern initcall_t __security_initcall_start[], __security_initcall_end[];
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/* Used for contructor calls. */
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typedef void (*ctor_fn_t)(void);
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/* Defined in init/main.c */
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extern int do_one_initcall(initcall_t fn);
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extern char __initdata boot_command_line[];
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extern char *saved_command_line;
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extern unsigned int reset_devices;
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/* used by init/main.c */
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void setup_arch(char **);
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void prepare_namespace(void);
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void __init load_default_modules(void);
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int __init init_rootfs(void);
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extern void (*late_time_init)(void);
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extern bool initcall_debug;
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#endif
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#ifndef MODULE
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_LTO
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/* Work around a LTO gcc problem: when there is no reference to a variable
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* in a module it will be moved to the end of the program. This causes
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* reordering of initcalls which the kernel does not like.
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* Add a dummy reference function to avoid this. The function is
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* deleted by the linker.
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*/
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#define LTO_REFERENCE_INITCALL(x) \
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; /* yes this is needed */ \
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static __used __exit void *reference_##x(void) \
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{ \
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return &x; \
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}
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#else
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#define LTO_REFERENCE_INITCALL(x)
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#endif
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/* initcalls are now grouped by functionality into separate
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* subsections. Ordering inside the subsections is determined
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* by link order.
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* For backwards compatibility, initcall() puts the call in
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* the device init subsection.
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*
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* The `id' arg to __define_initcall() is needed so that multiple initcalls
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* can point at the same handler without causing duplicate-symbol build errors.
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*/
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#define __define_initcall(fn, id) \
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static initcall_t __initcall_##fn##id __used \
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__attribute__((__section__(".initcall" #id ".init"))) = fn; \
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LTO_REFERENCE_INITCALL(__initcall_##fn##id)
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/*
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* Early initcalls run before initializing SMP.
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*
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* Only for built-in code, not modules.
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*/
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#define early_initcall(fn) __define_initcall(fn, early)
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/*
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* A "pure" initcall has no dependencies on anything else, and purely
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* initializes variables that couldn't be statically initialized.
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*
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* This only exists for built-in code, not for modules.
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* Keep main.c:initcall_level_names[] in sync.
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*/
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#define pure_initcall(fn) __define_initcall(fn, 0)
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#define core_initcall(fn) __define_initcall(fn, 1)
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#define core_initcall_sync(fn) __define_initcall(fn, 1s)
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#define postcore_initcall(fn) __define_initcall(fn, 2)
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#define postcore_initcall_sync(fn) __define_initcall(fn, 2s)
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#define arch_initcall(fn) __define_initcall(fn, 3)
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#define arch_initcall_sync(fn) __define_initcall(fn, 3s)
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#define subsys_initcall(fn) __define_initcall(fn, 4)
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#define subsys_initcall_sync(fn) __define_initcall(fn, 4s)
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#define fs_initcall(fn) __define_initcall(fn, 5)
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#define fs_initcall_sync(fn) __define_initcall(fn, 5s)
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#define rootfs_initcall(fn) __define_initcall(fn, rootfs)
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#define device_initcall(fn) __define_initcall(fn, 6)
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#define device_initcall_sync(fn) __define_initcall(fn, 6s)
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#define late_initcall(fn) __define_initcall(fn, 7)
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#define late_initcall_sync(fn) __define_initcall(fn, 7s)
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#define __initcall(fn) device_initcall(fn)
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#define __exitcall(fn) \
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static exitcall_t __exitcall_##fn __exit_call = fn
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#define console_initcall(fn) \
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static initcall_t __initcall_##fn \
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__used __section(.con_initcall.init) = fn
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#define security_initcall(fn) \
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static initcall_t __initcall_##fn \
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__used __section(.security_initcall.init) = fn
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struct obs_kernel_param {
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const char *str;
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int (*setup_func)(char *);
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int early;
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};
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/*
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* Only for really core code. See moduleparam.h for the normal way.
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*
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* Force the alignment so the compiler doesn't space elements of the
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* obs_kernel_param "array" too far apart in .init.setup.
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*/
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#define __setup_param(str, unique_id, fn, early) \
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static const char __setup_str_##unique_id[] __initconst \
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__aligned(1) = str; \
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static struct obs_kernel_param __setup_##unique_id \
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__used __section(.init.setup) \
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__attribute__((aligned((sizeof(long))))) \
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= { __setup_str_##unique_id, fn, early }
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#define __setup(str, fn) \
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__setup_param(str, fn, fn, 0)
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/*
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* NOTE: fn is as per module_param, not __setup!
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* Emits warning if fn returns non-zero.
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*/
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#define early_param(str, fn) \
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__setup_param(str, fn, fn, 1)
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#define early_param_on_off(str_on, str_off, var, config) \
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\
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int var = IS_ENABLED(config); \
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\
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static int __init parse_##var##_on(char *arg) \
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{ \
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var = 1; \
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return 0; \
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} \
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__setup_param(str_on, parse_##var##_on, parse_##var##_on, 1); \
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\
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static int __init parse_##var##_off(char *arg) \
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{ \
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var = 0; \
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return 0; \
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} \
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__setup_param(str_off, parse_##var##_off, parse_##var##_off, 1)
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/* Relies on boot_command_line being set */
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void __init parse_early_param(void);
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void __init parse_early_options(char *cmdline);
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#endif /* __ASSEMBLY__ */
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#else /* MODULE */
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#define __setup_param(str, unique_id, fn) /* nothing */
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#define __setup(str, func) /* nothing */
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#endif
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/* Data marked not to be saved by software suspend */
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#define __nosavedata __section(.data..nosave)
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#ifdef MODULE
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#define __exit_p(x) x
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#else
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#define __exit_p(x) NULL
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#endif
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#endif /* _LINUX_INIT_H */
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