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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.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/smpimpl.h>
#include <rtems/score/assert.h>
#include <rtems/score/threaddispatch.h>
#include <rtems/score/threadimpl.h>
#include <rtems/config.h>
#include <rtems/fatal.h>
#if defined(RTEMS_DEBUG)
#include <rtems/bspIo.h>
#endif
void _SMP_Handler_initialize( void )
{
uint32_t max_cpus = rtems_configuration_get_maximum_processors();
uint32_t cpu;
/*
* Discover and initialize the secondary cores in an SMP system.
*/
max_cpus = _CPU_SMP_Initialize( max_cpus );
_SMP_Processor_count = max_cpus;
for ( cpu = 1 ; cpu < max_cpus; ++cpu ) {
const Per_CPU_Control *per_cpu = _Per_CPU_Get_by_index( cpu );
_Per_CPU_Wait_for_state(
per_cpu,
PER_CPU_STATE_READY_TO_BEGIN_MULTITASKING
);
}
}
void _SMP_Start_multitasking_on_secondary_processor( void )
{
Per_CPU_Control *self_cpu = _Per_CPU_Get();
#if defined(RTEMS_DEBUG)
printk( "Made it to %d -- ", _Per_CPU_Get_index( self_cpu ) );
#endif
_Per_CPU_Change_state( self_cpu, PER_CPU_STATE_READY_TO_BEGIN_MULTITASKING );
_Per_CPU_Wait_for_state( self_cpu, PER_CPU_STATE_BEGIN_MULTITASKING );
_Thread_Start_multitasking();
}
void _SMP_Inter_processor_interrupt_handler( void )
{
Per_CPU_Control *self_cpu = _Per_CPU_Get();
if ( self_cpu->message != 0 ) {
uint32_t message;
ISR_Level level;
_Per_CPU_ISR_disable_and_acquire( self_cpu, level );
message = self_cpu->message;
self_cpu->message = 0;
_Per_CPU_Release_and_ISR_enable( self_cpu, level );
#if defined(RTEMS_DEBUG)
{
void *sp = __builtin_frame_address(0);
if ( !(message & SMP_MESSAGE_SHUTDOWN) ) {
printk(
"ISR on CPU %d -- (0x%02x) (0x%p)\n",
_Per_CPU_Get_index( self_cpu ),
message,
sp
);
if ( message & SMP_MESSAGE_SHUTDOWN )
printk( "shutdown\n" );
}
printk( "Dispatch level %d\n", _Thread_Dispatch_get_disable_level() );
}
#endif
if ( ( message & SMP_MESSAGE_SHUTDOWN ) != 0 ) {
_Per_CPU_Change_state( self_cpu, PER_CPU_STATE_SHUTDOWN );
rtems_fatal( RTEMS_FATAL_SOURCE_SMP, SMP_FATAL_SHUTDOWN );
/* does not continue past here */
}
}
}
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_Thread_dispatching_repressed();
for ( cpu = 0 ; cpu < ncpus ; ++cpu ) {
if ( cpu != self ) {
_SMP_Send_message( cpu, message );
}
}
}
void _SMP_Request_other_cores_to_perform_first_context_switch( void )
{
uint32_t self = _SMP_Get_current_processor();
uint32_t ncpus = _SMP_Get_processor_count();
uint32_t cpu;
for ( cpu = 0 ; cpu < ncpus ; ++cpu ) {
Per_CPU_Control *per_cpu = _Per_CPU_Get_by_index( cpu );
if ( cpu != self ) {
_Per_CPU_Change_state( per_cpu, PER_CPU_STATE_BEGIN_MULTITASKING );
}
}
}
void _SMP_Request_other_cores_to_shutdown( void )
{
uint32_t self = _SMP_Get_current_processor();
/*
* Do not use _SMP_Get_processor_count() since this value might be not
* initialized yet. For example due to a fatal error in the middle of
* _CPU_SMP_Initialize().
*/
uint32_t ncpus = rtems_configuration_get_maximum_processors();
uint32_t cpu;
for ( cpu = 0 ; cpu < ncpus ; ++cpu ) {
if ( cpu != self ) {
const Per_CPU_Control *per_cpu = _Per_CPU_Get_by_index( cpu );
if ( per_cpu->state != PER_CPU_STATE_BEFORE_INITIALIZATION ) {
_SMP_Send_message( cpu, SMP_MESSAGE_SHUTDOWN );
}
}
}
}
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