116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/**
|
|
* @file entropy.h
|
|
*
|
|
* @brief Public APIs for the entropy driver.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 2016 ARM Ltd.
|
|
* Copyright (c) 2017 Intel Corporation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
#ifndef __ENTROPY_H__
|
|
#define __ENTROPY_H__
|
|
|
|
/**
|
|
* @brief Entropy Interface
|
|
* @defgroup entropy_interface Entropy Interface
|
|
* @ingroup io_interfaces
|
|
* @{
|
|
*/
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#include <zephyr/types.h>
|
|
#include <device.h>
|
|
|
|
/**
|
|
* @typedef entropy_get_entropy_t
|
|
* @brief Callback API to get entropy.
|
|
*
|
|
* See entropy_get_entropy() for argument description
|
|
*/
|
|
typedef int (*entropy_get_entropy_t)(struct device *dev,
|
|
u8_t *buffer,
|
|
u16_t length);
|
|
/**
|
|
* @typedef entropy_get_entropy_isr_t
|
|
* @brief Callback API to get entropy from an ISR.
|
|
*
|
|
* See entropy_get_entropy_isr() for argument description
|
|
*/
|
|
typedef int (*entropy_get_entropy_isr_t)(struct device *dev,
|
|
u8_t *buffer,
|
|
u16_t length,
|
|
u32_t flags);
|
|
struct entropy_driver_api {
|
|
entropy_get_entropy_t get_entropy;
|
|
entropy_get_entropy_isr_t get_entropy_isr;
|
|
};
|
|
|
|
/**
|
|
* @brief Fills a buffer with entropy. Blocks if required in order to
|
|
* generate the necessary random data.
|
|
*
|
|
* @param dev Pointer to the entropy device.
|
|
* @param buffer Buffer to fill with entropy.
|
|
* @param length Buffer length.
|
|
* @retval 0 on success.
|
|
* @retval -ERRNO errno code on error.
|
|
*/
|
|
__syscall int entropy_get_entropy(struct device *dev,
|
|
u8_t *buffer,
|
|
u16_t length);
|
|
|
|
static inline int _impl_entropy_get_entropy(struct device *dev,
|
|
u8_t *buffer,
|
|
u16_t length)
|
|
{
|
|
const struct entropy_driver_api *api = dev->driver_api;
|
|
|
|
__ASSERT(api->get_entropy, "Callback pointer should not be NULL");
|
|
return api->get_entropy(dev, buffer, length);
|
|
}
|
|
|
|
/* Busy-wait for random data to be ready */
|
|
#define ENTROPY_BUSYWAIT BIT(0)
|
|
|
|
/**
|
|
* @brief Fills a buffer with entropy in a non-blocking or busy-wait manner.
|
|
* Callable from ISRs.
|
|
*
|
|
* @param dev Pointer to the device structure.
|
|
* @param buffer Buffer to fill with entropy.
|
|
* @param length Buffer length.
|
|
* @param flags Flags to modify the behavior of the call.
|
|
* @retval number of bytes filled with entropy or -error.
|
|
*/
|
|
static inline int entropy_get_entropy_isr(struct device *dev,
|
|
u8_t *buffer,
|
|
u16_t length,
|
|
u32_t flags)
|
|
{
|
|
const struct entropy_driver_api *api = dev->driver_api;
|
|
|
|
if (!api->get_entropy_isr) {
|
|
return -ENOTSUP;
|
|
}
|
|
return api->get_entropy_isr(dev, buffer, length, flags);
|
|
}
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#include <syscalls/entropy.h>
|
|
|
|
#endif /* __ENTROPY_H__ */
|