128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_UML_INIT_H
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#define _LINUX_UML_INIT_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 between the variable name and equal
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* 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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* Also note, that this data cannot be "const".
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*/
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#ifndef _LINUX_INIT_H
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typedef int (*initcall_t)(void);
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typedef void (*exitcall_t)(void);
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#include <linux/compiler_types.h>
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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)
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#define __initdata __section(.init.data)
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#define __exitdata __section(.exit.data)
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#define __exit_call __used __section(.exitcall.exit)
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#ifdef MODULE
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#define __exit __section(.exit.text)
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#else
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#define __exit __used __section(.exit.text)
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#endif
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#endif
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#ifndef MODULE
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struct uml_param {
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const char *str;
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int (*setup_func)(char *, int *);
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};
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extern initcall_t __uml_postsetup_start, __uml_postsetup_end;
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extern const char *__uml_help_start, *__uml_help_end;
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#endif
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#define __uml_exitcall(fn) \
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static exitcall_t __uml_exitcall_##fn __uml_exit_call = fn
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extern struct uml_param __uml_setup_start, __uml_setup_end;
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#define __uml_postsetup(fn) \
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static initcall_t __uml_postsetup_##fn __uml_postsetup_call = fn
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#define __non_empty_string(dummyname,string) \
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struct __uml_non_empty_string_struct_##dummyname \
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{ \
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char _string[sizeof(string)-2]; \
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}
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#ifndef MODULE
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#define __uml_setup(str, fn, help...) \
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__non_empty_string(fn ##_setup, str); \
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__uml_help(fn, help); \
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static char __uml_setup_str_##fn[] __initdata = str; \
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static struct uml_param __uml_setup_##fn __uml_init_setup = { __uml_setup_str_##fn, fn }
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#else
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#define __uml_setup(str, fn, help...) \
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#endif
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#define __uml_help(fn, help...) \
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__non_empty_string(fn ##__help, help); \
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static char __uml_help_str_##fn[] __initdata = help; \
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static const char *__uml_help_##fn __uml_setup_help = __uml_help_str_##fn
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/*
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* Mark functions and data as being only used at initialization
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* or exit time.
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*/
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#define __uml_init_setup __used __section(.uml.setup.init)
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#define __uml_setup_help __used __section(.uml.help.init)
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#define __uml_postsetup_call __used __section(.uml.postsetup.init)
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#define __uml_exit_call __used __section(.uml.exitcall.exit)
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#ifdef __UM_HOST__
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#define __define_initcall(level,fn) \
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static initcall_t __initcall_##fn __used \
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__attribute__((__section__(".initcall" level ".init"))) = fn
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/* Userspace initcalls shouldn't depend on anything in the kernel, so we'll
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* make them run first.
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*/
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#define __initcall(fn) __define_initcall("1", fn)
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#define __exitcall(fn) static exitcall_t __exitcall_##fn __exit_call = fn
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#define __init_call __used __section(.initcall.init)
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#endif
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#endif /* _LINUX_UML_INIT_H */
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