nrf_svc_function.h

/**
 * Copyright (c) 2016 - 2017, Nordic Semiconductor ASA
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 * 
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 * 
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 * 
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 *    engineered, decompiled, modified and/or disassembled.
 * 
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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 */
#ifndef NRF_SVC_FUNCTION_H__
#define NRF_SVC_FUNCTION_H__

#include <stdint.h>
#include "nrf_section.h"
#include "app_util.h"
#include "nrf_svci.h"

#ifdef __cplusplus
extern "C" {
#endif


/** @brief Function to be called from an SVC handler.
 *
 * @warning The function prototype must be limited to a maximum of four arguments, due to the nature of SVC calls.
 */
typedef uint32_t (*nrf_svc_func_t)();

/** @brief Type holding the SVC number and the pointer to the corresponding function.
 *
 * Not that the function that is pointed to must not change version.
 */
typedef struct
{
    uint32_t            svc_num;        /**< Supervisor call number (actually 8-bit, padded for alignment). */
    uint32_t            svci_num;       /**< Supervisor call indirect number. */
    nrf_svc_func_t      func_ptr;
} nrf_svc_func_reg_t;


// Verify that the size of nrf_svc_func_t is aligned.
STATIC_ASSERT(sizeof(nrf_svc_func_reg_t) % 4 == 0);


/** @brief  Macro for registering a structure holding SVC number and function pointer.
 *
 * @details     This macro places the variable in a section named "svc_data" that
                the SVC handler uses during regular operation.
 */
#define SVC_REGISTER_FUNCTION(svc_var) NRF_SECTION_ITEM_REGISTER(svc_data, svc_var)


#ifdef __cplusplus
}
#endif

#endif // NRF_SVC_FUNCTION_H__