leon3/start/bspstart.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSBSPsSPARCLEON3
0007  *
0008  * @brief This source file contains the implementation of bsp_start() and
0009  *   definitions of BSP-specific objects.
0010  */
0011
0012 /*
0013  *  COPYRIGHT (c) 2011
0014  *  Aeroflex Gaisler
0015  *
0016  *  COPYRIGHT (c) 1989-2013.
0017  *  On-Line Applications Research Corporation (OAR).
0018  *
0019  *  Modified for LEON3 BSP.
0020  *  COPYRIGHT (c) 2004.
0021  *  Gaisler Research.
0022  *
0023  * Redistribution and use in source and binary forms, with or without
0024  * modification, are permitted provided that the following conditions
0025  * are met:
0026  * 1. Redistributions of source code must retain the above copyright
0027  *    notice, this list of conditions and the following disclaimer.
0028  * 2. Redistributions in binary form must reproduce the above copyright
0029  *    notice, this list of conditions and the following disclaimer in the
0030  *    documentation and/or other materials provided with the distribution.
0031  *
0032  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0033  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0034  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0035  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0036  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0037  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0038  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0039  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0040  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0041  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0042  * POSSIBILITY OF SUCH DAMAGE.
0043  */
0044
0045 #include <bsp.h>
0046 #include <bsp/irq-generic.h>
0047 #include <bsp/leon3.h>
0048 #include <bsp/bootcard.h>
0049 #include <rtems/sysinit.h>
0050
0051 #if defined(RTEMS_SMP) || defined(RTEMS_MULTIPROCESSING)
0052 /* Irq used by shared memory driver and for inter-processor interrupts.
0053  * Can be overridden by being defined in the application.
0054  */
0055 const unsigned char LEON3_mp_irq __attribute__((weak)) = 14;
0056 #endif
0057
0058 /*
0059  * Tells us if data cache snooping is available
0060  */
0061 int CPU_SPARC_HAS_SNOOPING;
0062
0063 /* Index of CPU, in an AMP system CPU-index may be non-zero */
0064 uint32_t LEON3_Cpu_Index = 0;
0065
0066 /*
0067  * set_snooping
0068  *
0069  * Read the cache control register to determine if
0070  * bus snooping is available and enabled. This is needed for some
0071  * drivers so that they can select the most efficient copy routines.
0072  *
0073  */
0074
0075 static inline int set_snooping(void)
0076 {
0077   return (leon3_get_cache_control_register() >> 23) & 1;
0078 }
0079
0080 /*
0081  *  bsp_start
0082  *
0083  *  This routine does the bulk of the system initialization.
0084  */
0085 void bsp_start( void )
0086 {
0087   CPU_SPARC_HAS_SNOOPING = set_snooping();
0088
0089 #ifndef RTEMS_DRVMGR_STARTUP
0090   bsp_interrupt_initialize();
0091 #endif
0092 }
0093
0094 static void leon3_cpu_index_init(void)
0095 {
0096   /* Get the LEON3 CPU index, normally 0, but for MP systems we do
0097    * _not_ assume that this is CPU0. One may run another OS on CPU0
0098    * and RTEMS on this CPU, and AMP system with mixed operating
0099    * systems
0100    */
0101   LEON3_Cpu_Index = _LEON3_Get_current_processor();
0102 }
0103
0104 RTEMS_SYSINIT_ITEM(
0105   leon3_cpu_index_init,
0106   RTEMS_SYSINIT_BSP_START,
0107   RTEMS_SYSINIT_ORDER_FIRST
0108 );
0109
0110 /*
0111  * Initialize shared interrupt handling, must be done after IRQ controller has
0112  * been found and initialized.
0113  */
0114 #ifdef RTEMS_DRVMGR_STARTUP
0115 RTEMS_SYSINIT_ITEM(
0116   bsp_interrupt_initialize,
0117   RTEMS_SYSINIT_DRVMGR_LEVEL_1,
0118   RTEMS_SYSINIT_ORDER_LAST_BUT_5
0119 );
0120 #endif