forked from Imagelibrary/rtems
90 lines
3.2 KiB
C
90 lines
3.2 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 RTEMSBSPsARMTMS570
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*
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* @brief This source file contains the bsp_start() implementation.
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*/
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/*
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* Copyright (C) 2014 Premysl Houdek <kom541000@gmail.com>
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*
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* Google Summer of Code 2014 at
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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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* 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 <bsp/tms570-pom.h>
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#include <bsp/irq-generic.h>
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#include <bsp/bootcard.h>
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#include <bsp/linker-symbols.h>
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void bsp_start( void )
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{
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void *need_remap_ptr;
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unsigned int need_remap_int;
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tms570_pom_initialize_and_clear();
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/*
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* If RTEMS image does not start at address 0x00000000
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* then first level exception table at memory begin has
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* to be replaced to point to RTEMS handlers addresses.
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*
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* There is no VBAR or other option because Cortex-R
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* does provides only fixed address 0x00000000 for exceptions
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* (0xFFFF0000-0xFFFF001C alternative SCTLR.V = 1 cannot
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* be used because target area corersponds to PMM peripheral
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* registers on TMS570).
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*
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* Alternative is to use jumps over SRAM based trampolines
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* but that is not compatible with
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* Check TCRAM1 ECC error detection logic
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* which intentionally introduces data abort during startup
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* to check SRAM and if exception processing goes through
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* SRAM then it leads to CPU error halt.
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*
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* So use of POM to replace jumps to vectors target
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* addresses seems to be the best option for now.
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*
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* The passing of linker symbol (represented as start address
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* of global array) through dummy asm block ensures that C compiler
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* cannot optimize comparison out on premise that reference cannot
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* evaluate to NULL definition in standard.
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*/
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need_remap_ptr = bsp_start_vector_table_begin;
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asm volatile ("\n": "=r" (need_remap_int): "0" (need_remap_ptr));
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if ( need_remap_int != 0 ) {
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tms570_pom_remap();
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}
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/* Interrupts */
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bsp_interrupt_initialize();
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}
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