init.h

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/*
 * Copyright (c) 2015 Intel Corporation.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_INIT_H_
#define ZEPHYR_INCLUDE_INIT_H_
 
#include <stdint.h>
#include <stddef.h>
 
#include <zephyr/sys/util.h>
#include <zephyr/toolchain.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct device;
 
union init_function {
        int (*sys)(void);
        int (*dev)(const struct device *dev);
};
 
struct init_entry {
        union init_function init_fn;
        const struct device *dev;
};
 
/* Helper definitions to evaluate level equality */
#define Z_INIT_EARLY_EARLY               1
#define Z_INIT_PRE_KERNEL_1_PRE_KERNEL_1 1
#define Z_INIT_PRE_KERNEL_2_PRE_KERNEL_2 1
#define Z_INIT_POST_KERNEL_POST_KERNEL   1
#define Z_INIT_APPLICATION_APPLICATION   1
#define Z_INIT_SMP_SMP                   1
 
/* Init level ordinals */
#define Z_INIT_ORD_EARLY        0
#define Z_INIT_ORD_PRE_KERNEL_1 1
#define Z_INIT_ORD_PRE_KERNEL_2 2
#define Z_INIT_ORD_POST_KERNEL  3
#define Z_INIT_ORD_APPLICATION  4
#define Z_INIT_ORD_SMP          5
 
#define Z_INIT_ENTRY_NAME(init_id) _CONCAT(__init_, init_id)
 
#define Z_INIT_ENTRY_SECTION(level, prio, sub_prio)                           \
        __attribute__((__section__(                                           \
                ".z_init_" #level STRINGIFY(prio)"_" STRINGIFY(sub_prio)"_")))
 
#define INIT_LEVEL_ORD(level)                                                  \
        COND_CODE_1(Z_INIT_EARLY_##level, (Z_INIT_ORD_EARLY),                  \
        (COND_CODE_1(Z_INIT_PRE_KERNEL_1_##level, (Z_INIT_ORD_PRE_KERNEL_1),   \
        (COND_CODE_1(Z_INIT_PRE_KERNEL_2_##level, (Z_INIT_ORD_PRE_KERNEL_2),   \
        (COND_CODE_1(Z_INIT_POST_KERNEL_##level, (Z_INIT_ORD_POST_KERNEL),     \
        (COND_CODE_1(Z_INIT_APPLICATION_##level, (Z_INIT_ORD_APPLICATION),     \
        (COND_CODE_1(Z_INIT_SMP_##level, (Z_INIT_ORD_SMP),                     \
        (ZERO_OR_COMPILE_ERROR(0)))))))))))))
 
#define SYS_INIT(init_fn, level, prio)                                         \
        SYS_INIT_NAMED(init_fn, init_fn, level, prio)
 
#define SYS_INIT_NAMED(name, init_fn_, level, prio)                            \
        static const Z_DECL_ALIGN(struct init_entry)                           \
                Z_INIT_ENTRY_SECTION(level, prio, 0) __used __noasan           \
                Z_INIT_ENTRY_NAME(name) = {                                    \
                        .init_fn = {.sys = (init_fn_)},                        \
                        .dev = NULL,                                           \
        }
 
#ifdef __cplusplus
}
#endif
 
#endif /* ZEPHYR_INCLUDE_INIT_H_ */