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/**
* @file
*
* @brief SMP Support
* @ingroup Score
*/
/*
* 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/smpimpl.h>
#include <rtems/score/assert.h>
#include <rtems/score/schedulerimpl.h>
#include <rtems/score/threaddispatch.h>
#include <rtems/score/threadimpl.h>
#include <rtems/config.h>
static void _SMP_Check_scheduler_configuration( void )
{
size_t n = _Scheduler_Count;
size_t i;
for ( i = 0 ; i < n ; ++i ) {
const Scheduler_Control *scheduler = &_Scheduler_Table[ i ];
if ( scheduler->context->processor_count == 0 ) {
_SMP_Fatal( SMP_FATAL_SCHEDULER_WITHOUT_PROCESSORS );
}
}
}
static void _SMP_Start_processors( uint32_t cpu_count )
{
uint32_t cpu_self = _SMP_Get_current_processor();
uint32_t cpu_index;
for ( cpu_index = 0 ; cpu_index < cpu_count; ++cpu_index ) {
const Scheduler_Assignment *assignment =
_Scheduler_Get_assignment( cpu_index );
Per_CPU_Control *per_cpu = _Per_CPU_Get_by_index( cpu_index );
bool started;
if ( cpu_index != cpu_self ) {
if ( _Scheduler_Should_start_processor( assignment ) ) {
started = _CPU_SMP_Start_processor( cpu_index );
if ( !started && _Scheduler_Is_mandatory_processor( assignment ) ) {
_SMP_Fatal( SMP_FATAL_START_OF_MANDATORY_PROCESSOR_FAILED );
}
} else {
started = false;
}
} else {
started = true;
if ( !_Scheduler_Should_start_processor( assignment ) ) {
_SMP_Fatal( SMP_FATAL_BOOT_PROCESSOR_NOT_ASSIGNED_TO_SCHEDULER );
}
}
per_cpu->started = started;
if ( started ) {
++assignment->scheduler->context->processor_count;
}
}
_SMP_Check_scheduler_configuration();
}
void _SMP_Handler_initialize( void )
{
uint32_t cpu_max = rtems_configuration_get_maximum_processors();
uint32_t cpu_count;
uint32_t cpu_index;
for ( cpu_index = 0 ; cpu_index < cpu_max; ++cpu_index ) {
Per_CPU_Control *per_cpu = _Per_CPU_Get_by_index( cpu_index );
_SMP_ticket_lock_Initialize( &per_cpu->Lock, "per-CPU" );
}
/*
* Discover and initialize the secondary cores in an SMP system.
*/
cpu_count = _CPU_SMP_Initialize();
cpu_count = cpu_count < cpu_max ? cpu_count : cpu_max;
_SMP_Processor_count = cpu_count;
for ( cpu_index = cpu_count ; cpu_index < cpu_max; ++cpu_index ) {
const Scheduler_Assignment *assignment =
_Scheduler_Get_assignment( cpu_index );
if ( _Scheduler_Is_mandatory_processor( assignment ) ) {
_SMP_Fatal( SMP_FATAL_MANDATORY_PROCESSOR_NOT_PRESENT );
}
}
_SMP_Start_processors( cpu_count );
_CPU_SMP_Finalize_initialization( cpu_count );
}
void _SMP_Request_start_multitasking( void )
{
Per_CPU_Control *self_cpu = _Per_CPU_Get();
uint32_t ncpus = _SMP_Get_processor_count();
uint32_t cpu;
_Per_CPU_State_change( self_cpu, PER_CPU_STATE_READY_TO_START_MULTITASKING );
for ( cpu = 0 ; cpu < ncpus ; ++cpu ) {
Per_CPU_Control *per_cpu = _Per_CPU_Get_by_index( cpu );
_Per_CPU_State_change( per_cpu, PER_CPU_STATE_REQUEST_START_MULTITASKING );
}
}
void _SMP_Start_multitasking_on_secondary_processor( void )
{
Per_CPU_Control *self_cpu = _Per_CPU_Get();
if ( !_Per_CPU_Is_processor_started( self_cpu ) ) {
_SMP_Fatal( SMP_FATAL_MULTITASKING_START_ON_UNASSIGNED_PROCESSOR );
}
_Per_CPU_State_change( self_cpu, PER_CPU_STATE_READY_TO_START_MULTITASKING );
_Thread_Start_multitasking();
}
void _SMP_Request_shutdown( void )
{
Per_CPU_Control *self_cpu = _Per_CPU_Get();
_Per_CPU_State_change( self_cpu, PER_CPU_STATE_SHUTDOWN );
/*
* We have to drop the Giant lock here in order to give other processors the
* opportunity to receive the inter-processor interrupts issued previously.
* In case the executing thread still holds SMP locks, then other processors
* already waiting for this SMP lock will spin forever.
*/
_Giant_Drop( self_cpu );
}
void _SMP_Send_message( uint32_t cpu, uint32_t message )
{
Per_CPU_Control *per_cpu = _Per_CPU_Get_by_index( cpu );
ISR_Level level;
_Per_CPU_ISR_disable_and_acquire( per_cpu, level );
per_cpu->message |= message;
_Per_CPU_Release_and_ISR_enable( per_cpu, level );
_CPU_SMP_Send_interrupt( cpu );
}
void _SMP_Broadcast_message( uint32_t message )
{
uint32_t self = _SMP_Get_current_processor();
uint32_t ncpus = _SMP_Get_processor_count();
uint32_t cpu;
_Assert( _Debug_Is_thread_dispatching_allowed() );
for ( cpu = 0 ; cpu < ncpus ; ++cpu ) {
if ( cpu != self ) {
_SMP_Send_message( cpu, message );
}
}
}
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