cpu/or1k/or1k-context-initialize.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /*
0004  * COPYRIGHT (c) 2014 Hesham ALMatary <heshamelmatary@gmail.com>
0005  *
0006  * COPYRIGHT (c) 1989-2006
0007  * On-Line Applications Research Corporation (OAR).
0008  *
0009  * Redistribution and use in source and binary forms, with or without
0010  * modification, are permitted provided that the following conditions
0011  * are met:
0012  * 1. Redistributions of source code must retain the above copyright
0013  *    notice, this list of conditions and the following disclaimer.
0014  * 2. Redistributions in binary form must reproduce the above copyright
0015  *    notice, this list of conditions and the following disclaimer in the
0016  *    documentation and/or other materials provided with the distribution.
0017  *
0018  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0019  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0020  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0021  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0022  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0023  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0024  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0025  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0026  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0027  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0028  * POSSIBILITY OF SUCH DAMAGE.
0029  */
0030
0031 #ifdef HAVE_CONFIG_H
0032 #include "config.h"
0033 #endif
0034
0035 #include <string.h>
0036
0037 #include <rtems/score/cpu.h>
0038 #include <rtems/score/interr.h>
0039 #include <rtems/score/or1k-utility.h>
0040
0041 void _CPU_Context_Initialize(
0042   Context_Control *context,
0043   void *stack_area_begin,
0044   size_t stack_area_size,
0045   uint32_t new_level,
0046   void (*entry_point)( void ),
0047   bool is_fp,
0048   void *tls_area
0049 )
0050 {
0051   /* Decrement 200 byte to account for red-zone */
0052   uint32_t stack = ((uint32_t) stack_area_begin) - 200;
0053   uint32_t sr;
0054   uint32_t stack_high = stack + stack_area_size;
0055
0056   sr = _OR1K_mfspr(CPU_OR1K_SPR_SR);
0057
0058   memset(context, 0, sizeof(*context));
0059
0060   context->r1 = stack_high;
0061   context->r2 = stack_high;
0062   context->r9 = (uint32_t) entry_point;
0063   context->sr = sr;
0064 }