pc386/start/bspsmp.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /*
0004  * Copyright (C) 2020 Jan Sommer, Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
0005  *
0006  * Redistribution and use in source and binary forms, with or without
0007  * modification, are permitted provided that the following conditions
0008  * are met:
0009  * 1. Redistributions of source code must retain the above copyright
0010  *    notice, this list of conditions and the following disclaimer.
0011  * 2. Redistributions in binary form must reproduce the above copyright
0012  *    notice, this list of conditions and the following disclaimer in the
0013  *    documentation and/or other materials provided with the distribution.
0014  *
0015  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0016  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0017  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0018  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0019  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0020  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0021  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0022  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0023  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0024  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0025  * POSSIBILITY OF SUCH DAMAGE.
0026  */
0027
0028 #include <rtems/score/smpimpl.h>
0029
0030 #include <bsp/apic.h>
0031 #include <bsp/smp-imps.h>
0032 #include <bsp.h>
0033 #include <rtems.h>
0034
0035 void _CPU_SMP_Prepare_start_multitasking( void )
0036 {
0037   /* Do nothing */
0038 }
0039
0040 bool _CPU_SMP_Start_processor( uint32_t cpu_index )
0041 {
0042   (void) cpu_index;
0043
0044   return true;
0045 }
0046
0047
0048 uint32_t _CPU_SMP_Get_current_processor( void )
0049 {
0050   return imps_apic_cpu_map[APIC_ID(IMPS_LAPIC_READ(LAPIC_ID))];
0051 }
0052
0053 uint32_t _CPU_SMP_Initialize( void )
0054 {
0055   /* XXX need to deal with finding too many cores */
0056
0057   return (uint32_t) imps_probe();
0058 }
0059
0060 void _CPU_SMP_Finalize_initialization( uint32_t cpu_count )
0061 {
0062   if ( cpu_count > 1 )
0063     ipi_install_irq();
0064 }
0065
0066 void _CPU_SMP_Send_interrupt( uint32_t target_processor_index )
0067 {
0068   send_ipi( target_processor_index, 0x30 );
0069 }