/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSScorePerCPUData
*
* @brief This source file contains the per-CPU data linker set and its system
* initialization handler.
*/
/*
* Copyright (C) 2019, 2021 embedded brains GmbH & Co. KG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/percpudata.h>
#include <rtems/score/interr.h>
#include <rtems/score/memory.h>
#include <rtems/config.h>
#include <rtems/sysinit.h>
#include <string.h>
RTEMS_LINKER_RWSET(
_Per_CPU_Data,
#if defined(RTEMS_SMP)
/*
* In SMP configurations, prevent false cache line sharing of per-processor
* data with a proper alignment.
*/
RTEMS_ALIGNED( CPU_CACHE_LINE_BYTES )
#endif
char
);
#if defined(RTEMS_SMP)
static void _Per_CPU_Data_initialize( void )
{
uintptr_t size;
size = RTEMS_LINKER_SET_SIZE( _Per_CPU_Data );
if ( size > 0 ) {
char *data_begin;
const Memory_Information *mem;
Per_CPU_Control *cpu;
uint32_t cpu_index;
uint32_t cpu_max;
/* Prevent an out of bounds warning in the memcpy() below */
data_begin = RTEMS_LINKER_SET_BEGIN( _Per_CPU_Data );
RTEMS_OBFUSCATE_VARIABLE( data_begin );
mem = _Memory_Get();
cpu = _Per_CPU_Get_by_index( 0 );
cpu->data = data_begin;
cpu_max = rtems_configuration_get_maximum_processors();
for ( cpu_index = 1 ; cpu_index < cpu_max ; ++cpu_index ) {
cpu = _Per_CPU_Get_by_index( cpu_index );
cpu->data = _Memory_Allocate( mem, size, CPU_CACHE_LINE_BYTES );
if( cpu->data == NULL ) {
_Internal_error( INTERNAL_ERROR_NO_MEMORY_FOR_PER_CPU_DATA );
}
memcpy( cpu->data, data_begin, size);
}
}
}
RTEMS_SYSINIT_ITEM(
_Per_CPU_Data_initialize,
RTEMS_SYSINIT_PER_CPU_DATA,
RTEMS_SYSINIT_ORDER_MIDDLE
);
#endif
