/**
* @file
*
* @brief Create Idle Thread
* @ingroup ScoreThread
*/
/*
* COPYRIGHT (c) 1989-2011.
* 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.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/threadimpl.h>
#include <rtems/score/assert.h>
#include <rtems/score/schedulerimpl.h>
#include <rtems/score/stackimpl.h>
#include <rtems/score/sysstate.h>
#include <rtems/score/userextimpl.h>
#include <rtems/config.h>
static void _Thread_Create_idle_for_CPU( Per_CPU_Control *cpu )
{
Objects_Name name;
Thread_Control *idle;
const Scheduler_Control *scheduler;
scheduler = _Scheduler_Get_by_CPU( cpu );
#if defined(RTEMS_SMP)
if (scheduler == NULL) {
return;
}
#endif
name.name_u32 = _Objects_Build_name( 'I', 'D', 'L', 'E' );
/*
* The entire workspace is zeroed during its initialization. Thus, all
* fields not explicitly assigned were explicitly zeroed by
* _Workspace_Initialization.
*/
idle = _Thread_Internal_allocate();
_Assert( idle != NULL );
_Thread_Initialize(
&_Thread_Internal_information,
idle,
scheduler,
NULL, /* allocate the stack */
_Stack_Ensure_minimum( rtems_configuration_get_idle_task_stack_size() ),
CPU_IDLE_TASK_IS_FP,
_Scheduler_Map_priority( scheduler, scheduler->maximum_priority ),
true, /* preemptable */
THREAD_CPU_BUDGET_ALGORITHM_NONE,
NULL, /* no budget algorithm callout */
0, /* all interrupts enabled */
name
);
/*
* WARNING!!! This is necessary to "kick" start the system and
* MUST be done before _Thread_Start is invoked.
*/
cpu->heir =
cpu->executing = idle;
idle->is_idle = true;
idle->Start.Entry.adaptor = _Thread_Entry_adaptor_idle;
idle->Start.Entry.Kinds.Idle.entry = rtems_configuration_get_idle_task();
_Thread_Load_environment( idle );
idle->current_state = STATES_READY;
_Scheduler_Start_idle( scheduler, idle, cpu );
_User_extensions_Thread_start( idle );
}
void _Thread_Create_idle( void )
{
uint32_t cpu_count = _SMP_Get_processor_count();
uint32_t cpu_index;
_System_state_Set( SYSTEM_STATE_BEFORE_MULTITASKING );
for ( cpu_index = 0 ; cpu_index < cpu_count ; ++cpu_index ) {
Per_CPU_Control *cpu = _Per_CPU_Get_by_index( cpu_index );
if ( _Per_CPU_Is_processor_online( cpu ) ) {
_Thread_Create_idle_for_CPU( cpu );
}
}
}