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127 lines
3.7 KiB
127 lines
3.7 KiB
/* 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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