/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSImplClassicScheduler
*
* @brief This source file contains the implementation of
* rtems_scheduler_add_processor().
*/
/*
* Copyright (c) 2016 embedded brains GmbH. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/scheduler.h>
#include <rtems/score/assert.h>
#include <rtems/score/schedulerimpl.h>
#include <rtems/config.h>
rtems_status_code rtems_scheduler_add_processor(
rtems_id scheduler_id,
uint32_t cpu_index
)
{
uint32_t scheduler_index;
#if defined(RTEMS_SMP)
Per_CPU_Control *cpu;
rtems_status_code status;
#endif
scheduler_index = _Scheduler_Get_index_by_id( scheduler_id );
if ( scheduler_index >= _Scheduler_Count ) {
return RTEMS_INVALID_ID;
}
if ( cpu_index >= rtems_configuration_get_maximum_processors() ) {
return RTEMS_NOT_CONFIGURED;
}
#if defined(RTEMS_SMP)
cpu = _Per_CPU_Get_by_index( cpu_index );
if ( _Scheduler_Initial_assignments[ cpu_index ].scheduler == NULL ) {
return RTEMS_NOT_CONFIGURED;
}
if ( !_Per_CPU_Is_processor_online( cpu ) ) {
return RTEMS_INCORRECT_STATE;
}
_Objects_Allocator_lock();
if ( cpu->Scheduler.control == NULL ) {
const Scheduler_Control *scheduler;
Scheduler_Context *scheduler_context;
Priority_Control idle_priority;
Thread_Control *idle;
Scheduler_Node *scheduler_node;
ISR_lock_Context lock_context;
Per_CPU_Control *cpu_self;
scheduler = &_Scheduler_Table[ scheduler_index ];
scheduler_context = _Scheduler_Get_context( scheduler );
idle_priority =
_Scheduler_Map_priority( scheduler, scheduler->maximum_priority );
idle = cpu->Scheduler.idle_if_online_and_unused;
_Assert( idle != NULL );
cpu->Scheduler.idle_if_online_and_unused = NULL;
idle->Scheduler.home_scheduler = scheduler;
idle->Start.initial_priority = idle_priority;
scheduler_node =
_Thread_Scheduler_get_node_by_index( idle, scheduler_index );
_Priority_Node_set_priority( &idle->Real_priority, idle_priority );
_Priority_Initialize_one(
&scheduler_node->Wait.Priority,
&idle->Real_priority
);
_Assert( _Chain_Is_empty( &idle->Scheduler.Wait_nodes ) );
_Chain_Initialize_one(
&idle->Scheduler.Wait_nodes,
&scheduler_node->Thread.Wait_node
);
_Assert( _Chain_Is_empty( &idle->Scheduler.Scheduler_nodes ) );
_Chain_Initialize_one(
&idle->Scheduler.Scheduler_nodes,
&scheduler_node->Thread.Scheduler_node.Chain
);
_ISR_lock_ISR_disable( &lock_context );
_Scheduler_Acquire_critical( scheduler, &lock_context );
_Processor_mask_Set( &scheduler_context->Processors, cpu_index );
cpu->Scheduler.control = scheduler;
cpu->Scheduler.context = scheduler_context;
( *scheduler->Operations.add_processor )( scheduler, idle );
cpu_self = _Thread_Dispatch_disable_critical( &lock_context );
_Scheduler_Release_critical( scheduler, &lock_context );
_ISR_lock_ISR_enable( &lock_context );
_Thread_Dispatch_direct( cpu_self );
status = RTEMS_SUCCESSFUL;
} else {
status = RTEMS_RESOURCE_IN_USE;
}
_Objects_Allocator_unlock();
return status;
#else
return RTEMS_RESOURCE_IN_USE;
#endif
}
