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/*
* Copyright (c) 2011 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Obere Lagerstr. 30
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* 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 <rtems/score/nios2-utility.h>
static bool _Nios2_MPU_Is_region_disabled(
const Nios2_MPU_Configuration *config,
uint32_t mpubase,
uint32_t mpuacc
)
{
bool disabled = false;
if ( config->region_uses_limit ) {
disabled = (mpubase & NIOS2_MPUBASE_BASE_MASK)
> (mpuacc & NIOS2_MPUACC_LIMIT_MASK);
} else {
disabled = (mpuacc & NIOS2_MPUACC_MASK_MASK) == 0;
}
return disabled;
}
int _Nios2_MPU_Get_disabled_region_index(
const Nios2_MPU_Configuration *config,
bool data,
int begin,
int end
)
{
int index = -1;
int count = _Nios2_MPU_Get_region_count( config, data );
if ( end < 0 || count < end ) {
end = count;
}
if ( begin >= 0 ) {
int i = 0;
for ( i = begin; i < end && index < 0; ++i ) {
uint32_t mpubase = 0;
uint32_t mpuacc = 0;
_Nios2_MPU_Get_region_registers( i, data, &mpubase, &mpuacc );
if ( _Nios2_MPU_Is_region_disabled( config, mpubase, mpuacc ) ) {
index = i;
}
}
}
return index;
}
bool _Nios2_MPU_Add_region(
const Nios2_MPU_Configuration *config,
const Nios2_MPU_Region_descriptor *desc,
bool force
)
{
bool ok = true;
int index = desc->index;
bool data = desc->data;
uint32_t mpubase = 0;
uint32_t mpuacc = 0;
if ( _Nios2_MPU_Is_valid_index( config, index, data ) ) {
if ( !force ) {
_Nios2_MPU_Get_region_registers( index, data, &mpubase, &mpuacc );
ok = _Nios2_MPU_Is_region_disabled( config, mpubase, mpuacc );
}
if ( ok ) {
ok = _Nios2_MPU_Setup_region_registers(
config,
desc,
&mpubase,
&mpuacc
);
if ( ok ) {
_Nios2_Set_ctlreg_mpubase(mpubase);
_Nios2_Set_ctlreg_mpuacc(mpuacc);
}
}
} else {
ok = false;
}
return ok;
}
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