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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/bspsmp.h>
#include <rtems/score/thread.h>
#include <rtems/score/threaddispatch.h>
#include <rtems/score/smp.h>
#include <rtems/score/sysstate.h>
#if defined(RTEMS_DEBUG)
#include <rtems/bspIo.h>
#endif
void rtems_smp_secondary_cpu_initialize( void )
{
Per_CPU_Control *self_cpu = _Per_CPU_Get();
Thread_Control *heir;
#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 );
_Per_CPU_Change_state( self_cpu, PER_CPU_STATE_UP );
/*
* The Scheduler will have selected the heir thread for each CPU core.
* Now we have been requested to perform the first context switch. So
* force a switch to the designated heir and make it executing on
* THIS core.
*/
heir = self_cpu->heir;
heir->is_executing = true;
self_cpu->executing->is_executing = false;
self_cpu->executing = heir;
self_cpu->dispatch_necessary = false;
/*
* Threads begin execution in the _Thread_Handler() function. This function
* will call _Thread_Enable_dispatch().
*/
_Thread_Disable_dispatch();
_CPU_Context_switch_to_first_task_smp( &heir->Registers );
}
void rtems_smp_process_interrupt( void )
{
Per_CPU_Control *self_cpu = _Per_CPU_Get();
if ( self_cpu->message != 0 ) {
uint32_t message;
ISR_Level level;
_Per_CPU_Lock_acquire( self_cpu, level );
message = self_cpu->message;
self_cpu->message = 0;
_Per_CPU_Lock_release( self_cpu, level );
#if defined(RTEMS_DEBUG)
{
void *sp = __builtin_frame_address(0);
if ( !(message & RTEMS_BSP_SMP_SHUTDOWN) ) {
printk(
"ISR on CPU %d -- (0x%02x) (0x%p)\n",
_Per_CPU_Get_index( self_cpu ),
message,
sp
);
if ( message & RTEMS_BSP_SMP_SIGNAL_TO_SELF )
printk( "signal to self\n" );
if ( message & RTEMS_BSP_SMP_SHUTDOWN )
printk( "shutdown\n" );
}
printk( "Dispatch level %d\n", _Thread_Dispatch_get_disable_level() );
}
#endif
if ( ( message & RTEMS_BSP_SMP_SHUTDOWN ) != 0 ) {
_ISR_Disable( level );
_Thread_Dispatch_set_disable_level( 0 );
_Per_CPU_Change_state( self_cpu, PER_CPU_STATE_SHUTDOWN );
_CPU_Fatal_halt( _Per_CPU_Get_index( self_cpu ) );
/* 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;
#if defined(RTEMS_DEBUG)
if ( message & RTEMS_BSP_SMP_SIGNAL_TO_SELF )
printk( "Send 0x%x to %d\n", message, cpu );
#endif
_Per_CPU_Lock_acquire( per_cpu, level );
per_cpu->message |= message;
_Per_CPU_Lock_release( 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;
for ( cpu = 0 ; cpu < ncpus ; ++cpu ) {
if ( cpu != self ) {
Per_CPU_Control *per_cpu = _Per_CPU_Get_by_index( cpu );
ISR_Level level;
_Per_CPU_Lock_acquire( per_cpu, level );
per_cpu->message |= message;
_Per_CPU_Lock_release( per_cpu, level );
}
}
bsp_smp_broadcast_interrupt();
}
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 );
} else {
_Per_CPU_Change_state( per_cpu, PER_CPU_STATE_UP );
}
}
}
void _SMP_Request_other_cores_to_dispatch( void )
{
if ( _System_state_Is_up( _System_state_Get() ) ) {
uint32_t self = _SMP_Get_current_processor();
uint32_t ncpus = _SMP_Get_processor_count();
uint32_t cpu;
for ( cpu = 0 ; cpu < ncpus ; ++cpu ) {
const Per_CPU_Control *per_cpu = &_Per_CPU_Information[ cpu ];
if (
cpu != self
&& per_cpu->state == PER_CPU_STATE_UP
&& per_cpu->dispatch_necessary
) {
_SMP_Send_message( cpu, 0 );
}
}
}
}
void _SMP_Request_other_cores_to_shutdown( void )
{
uint32_t self = _SMP_Get_current_processor();
uint32_t ncpus = _SMP_Get_processor_count();
uint32_t cpu;
_SMP_Broadcast_message( RTEMS_BSP_SMP_SHUTDOWN );
for ( cpu = 0 ; cpu < ncpus ; ++cpu ) {
if ( cpu != self ) {
_Per_CPU_Wait_for_state(
_Per_CPU_Get_by_index( cpu ),
PER_CPU_STATE_SHUTDOWN
);
}
}
}
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