blob: 6fe49730e84a59d4d61e32767dd3d93261ec9eab [file] [log] [blame]
/*
* Copyright (c) 2015 Intel Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_INCLUDE_INIT_H_
#define ZEPHYR_INCLUDE_INIT_H_
#include <toolchain.h>
#include <kernel.h>
#include <zephyr/types.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* System initialization levels. The PRE_KERNEL_1 and PRE_KERNEL_2 levels are
* executed in the kernel's initialization context, which uses the interrupt
* stack. The remaining levels are executed in the kernel's main task.
*/
#define _SYS_INIT_LEVEL_PRE_KERNEL_1 0
#define _SYS_INIT_LEVEL_PRE_KERNEL_2 1
#define _SYS_INIT_LEVEL_POST_KERNEL 2
#define _SYS_INIT_LEVEL_APPLICATION 3
#ifdef CONFIG_SMP
#define _SYS_INIT_LEVEL_SMP 4
#endif
struct device;
/**
* @brief Static init entry structure for each device driver or services
*
* @param init init function for the init entry which will take the dev
* attribute as parameter. See below.
* @param dev pointer to a device driver instance structure. Can be NULL
* if the init entry is not used for a device driver but a service.
*/
struct init_entry {
/** Initialization function for the init entry which will take
* the dev attribute as parameter. See below.
*/
int (*init)(const struct device *dev);
/** Pointer to a device driver instance structure. Can be NULL
* if the init entry is not used for a device driver but a services.
*/
const struct device *dev;
};
void z_sys_init_run_level(int32_t _level);
/* A counter is used to avoid issues when two or more system devices
* are declared in the same C file with the same init function.
*/
#define Z_SYS_NAME(_init_fn) _CONCAT(_CONCAT(sys_init_, _init_fn), __COUNTER__)
/**
* @def Z_INIT_ENTRY_DEFINE
*
* @brief Create an init entry object and set it up for boot time initialization
*
* @details This macro defines an init entry object that will be automatically
* configured by the kernel during system initialization. Note that
* init entries will not be accessible from user mode. Also this macro should
* not be used directly, use relevant macro such as SYS_INIT() or
* DEVICE_DEFINE() instead.
*
* @param _entry_name Init entry name. It is the name this instance exposes to
* the system.
*
* @param _init_fn Address to the init function of the entry.
*
* @param _device A device driver instance pointer or NULL
*
* @param _level The initialization level at which configuration
* occurs. See SYS_INIT().
*
* @param prio The initialization priority of the object, relative to
* other objects of the same initialization level. See SYS_INIT().
*/
#define Z_INIT_ENTRY_DEFINE(_entry_name, _init_fn, _device, _level, _prio) \
static const Z_DECL_ALIGN(struct init_entry) \
_CONCAT(__init_, _entry_name) __used \
__attribute__((__section__(".init_" #_level STRINGIFY(_prio)))) = { \
.init = (_init_fn), \
.dev = (_device), \
}
/**
* @def SYS_INIT
*
* @ingroup device_model
*
* @brief Run an initialization function at boot at specified priority
*
* @details This macro lets you run a function at system boot.
*
* @param _init_fn Pointer to the boot function to run
*
* @param _level The initialization level at which configuration occurs.
* Must be one of the following symbols, which are listed in the order
* they are performed by the kernel:
* \n
* \li PRE_KERNEL_1: Used for initialization objects that have no dependencies,
* such as those that rely solely on hardware present in the processor/SOC.
* These objects cannot use any kernel services during configuration, since
* they are not yet available.
* \n
* \li PRE_KERNEL_2: Used for initialization objects that rely on objects
* initialized as part of the PRE_KERNEL_1 level. These objects cannot use any
* kernel services during configuration, since they are not yet available.
* \n
* \li POST_KERNEL: Used for initialization objects that require kernel services
* during configuration.
* \n
* \li POST_KERNEL_SMP: Used for initialization objects that require kernel
* services during configuration after SMP initialization.
* \n
* \li APPLICATION: Used for application components (i.e. non-kernel components)
* that need automatic configuration. These objects can use all services
* provided by the kernel during configuration.
*
* @param _prio The initialization priority of the object, relative to
* other objects of the same initialization level. Specified as an integer
* value in the range 0 to 99; lower values indicate earlier initialization.
* Must be a decimal integer literal without leading zeroes or sign (e.g. 32),
* or an equivalent symbolic name (e.g. \#define MY_INIT_PRIO 32); symbolic
* expressions are *not* permitted
* (e.g. CONFIG_KERNEL_INIT_PRIORITY_DEFAULT + 5).
*/
#define SYS_INIT(_init_fn, _level, _prio) \
Z_INIT_ENTRY_DEFINE(Z_SYS_NAME(_init_fn), _init_fn, NULL, _level, _prio)
#ifdef __cplusplus
}
#endif
#endif /* ZEPHYR_INCLUDE_INIT_H_ */