/*
* Copyright (c) 2011 embedded brains GmbH
*
* Copyright (c) 2006 Kolja Waschk (rtemsdev/ixo.de)
*
* COPYRIGHT (c) 1989-2006
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <rtems/score/cpu.h>
#include <rtems/score/nios2-utility.h>
#include <rtems/score/interr.h>
void _CPU_Context_Initialize(
Context_Control *context,
void *stack_area_begin,
size_t stack_area_size,
uint32_t new_level,
void (*entry_point)( void ),
bool is_fp,
void *tls_area
)
{
const Nios2_MPU_Configuration *mpu_config = _Nios2_MPU_Get_configuration();
uint32_t stack = (uint32_t) stack_area_begin + stack_area_size - 4;
memset(context, 0, sizeof(*context));
context->fp = stack;
context->status = _Nios2_ISR_Set_level( new_level, NIOS2_STATUS_PIE );
context->sp = stack;
context->ra = (uint32_t) entry_point;
if ( mpu_config != NULL ) {
Nios2_MPU_Region_descriptor desc = {
.index = mpu_config->data_index_for_stack_protection,
/* FIXME: Brocken stack allocator */
.base = (void *) ((int) stack_area_begin & ~((1 << mpu_config->data_region_size_log2) - 1)),
.end = (char *) stack_area_begin + stack_area_size,
.perm = NIOS2_MPU_DATA_PERM_SVR_READWRITE_USER_NONE,
.data = true,
.cacheable = mpu_config->enable_data_cache_for_stack,
.read = false,
.write = true
};
bool ok = _Nios2_MPU_Setup_region_registers(
mpu_config,
&desc,
&context->stack_mpubase,
&context->stack_mpuacc
);
if ( !ok ) {
/* The task stack allocator must ensure that the stack area is valid */
_Terminate( INTERNAL_ERROR_CORE, 0xdeadbeef );
}
}
}