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https://github.com/zephyrproject-rtos/zephyr
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969f8f1c68
move entropy.h to drivers/entropy.h and create a shim for backward-compatibility. No functional changes to the headers. A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES. Related to #16539 Signed-off-by: Anas Nashif <anas.nashif@intel.com>
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/*
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* Copyright (c) 2017 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <sys/atomic.h>
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#include <kernel.h>
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#include <drivers/entropy.h>
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static struct device *entropy_driver;
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u32_t sys_rand32_get(void)
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{
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struct device *dev = entropy_driver;
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u32_t random_num;
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int ret;
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if (unlikely(!dev)) {
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/* Only one entropy device exists, so this is safe even
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* if the whole operation isn't atomic.
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*/
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dev = device_get_binding(CONFIG_ENTROPY_NAME);
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__ASSERT((dev != NULL),
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"Device driver for %s (CONFIG_ENTROPY_NAME) not found. "
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"Check your build configuration!",
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CONFIG_ENTROPY_NAME);
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entropy_driver = dev;
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}
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ret = entropy_get_entropy(dev, (u8_t *)&random_num,
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sizeof(random_num));
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if (unlikely(ret < 0)) {
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/* Use system timer in case the entropy device couldn't deliver
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* 32-bit of data. There's not much that can be done in this
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* situation. An __ASSERT() isn't used here as the HWRNG might
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* still be gathering entropy during early boot situations.
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*/
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random_num = k_cycle_get_32();
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}
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return random_num;
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}
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