forked from Imagelibrary/rtems
276d2efb37
There is no need to wait for the secondary processor in _CPU_SMP_Start_processor() since _CPU_SMP_Finalize_initialization() does nothing. The caller of _CPU_SMP_Start_processor() ensures that we do not start the current processor.
79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @ingroup raspberrypi
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*
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* @brief Raspberry pi SMP management functions provided to SuperCore
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*/
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/*
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* Copyright (c) 2016 Pavel Pisa <pisa@cmp.felk.cvut.cz>
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*
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* Czech Technical University in Prague
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* Zikova 1903/4
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* 166 36 Praha 6
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* Czech Republic
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*
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* Reuses some ideas from Rohini Kulkarni <krohini1593@gmail.com>
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* GSoC 2015 project and Altera Cyclone-V SMP code
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* by embedded brains GmbH & Co. KG
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <rtems/score/cpu.h>
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#include <bsp/raspberrypi.h>
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#include <bsp/start.h>
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bool _CPU_SMP_Start_processor( uint32_t cpu_index )
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{
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BCM2835_REG(BCM2836_MAILBOX_3_WRITE_SET_BASE + 0x10 * cpu_index) = (uint32_t)_start;
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_ARM_Send_event();
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return true;
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}
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uint32_t _CPU_SMP_Initialize(void)
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{
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return 4;
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}
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void _CPU_SMP_Finalize_initialization( uint32_t cpu_count )
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{
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/* Do nothing */
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}
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void _CPU_SMP_Prepare_start_multitasking( void )
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{
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/* Do nothing */
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}
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void _CPU_SMP_Send_interrupt( uint32_t target_cpu_index )
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{
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/* Generates IPI */
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BCM2835_REG(BCM2836_MAILBOX_3_WRITE_SET_BASE +
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0x10 * target_cpu_index) = 0x1;
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}
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