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https://github.com/zephyrproject-rtos/zephyr
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a715194d43
Use the SYS_INIT() mechanism to invoke the sys_rand32_init() function in random drivers that require an initializer. Remove all empty sys_rand32_init() instances. The existing explicit sys_rand32_init() function runs immediately after PRE_KERNEL_2 before stack canaries are initialized. In order to get equivalent behaviour with sys_rand32_init() we set SYS_INIT() to initialize the random drivers at the lowest priority of PRE_KERNEL_2. Change-Id: I4521e44daac806bc4eef01ce7fdf2ba5367e0587 Signed-off-by: Marcus Shawcroft <marcus.shawcroft@arm.com>
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/*
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* Copyright (c) 2013-2014 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file
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* @brief Non-random number generator based on x86 CPU timestamp
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*
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* This module provides a non-random implementation of sys_rand32_get(), which
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* is not meant to be used in a final product as a truly random number
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* generator. It was provided to allow testing on a platform that does not (yet)
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* provide a random number generator.
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*/
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#include <kernel.h>
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#include <arch/cpu.h>
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#include <drivers/rand32.h>
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/**
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*
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* @brief Get a 32 bit random number
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*
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* The non-random number generator returns values that are based off the
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* CPU's timestamp counter, which means that successive calls will normally
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* display ever-increasing values.
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*
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* @return a 32-bit number
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*/
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uint32_t sys_rand32_get(void)
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{
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return _do_read_cpu_timestamp32();
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}
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