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/*
* ISR Enable/Disable for SMP Configurations
*
* 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.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/score/isr.h>
#include <rtems/score/thread.h>
#include <rtems/score/smp.h>
void _ISR_SMP_Initialize(void)
{
}
ISR_Level _ISR_SMP_Disable(void)
{
ISR_Level level;
_ISR_Disable_on_this_core( level );
return level;
}
void _ISR_SMP_Enable(ISR_Level level)
{
_ISR_Enable_on_this_core( level );
}
void _ISR_SMP_Flash(ISR_Level level)
{
ISR_Level ignored;
_ISR_SMP_Enable( level );
ignored = _ISR_SMP_Disable();
}
int _ISR_SMP_Enter(void)
{
uint32_t isr_nest_level;
ISR_Level level;
_ISR_Disable_on_this_core( level );
isr_nest_level = _ISR_Nest_level++;
_Thread_Disable_dispatch();
return isr_nest_level;
}
/*
* Return values:
* 0 - simple return
* 1 - dispatching return
*/
int _ISR_SMP_Exit(void)
{
ISR_Level level;
int retval;
retval = 0;
_ISR_Disable_on_this_core( level );
_ISR_Nest_level--;
if ( _ISR_Nest_level == 0 ) {
if ( _Thread_Dispatch_necessary ) {
if ( _Thread_Dispatch_get_disable_level() == 1 ) {
retval = 1;
}
}
}
/*
* SPARC has special support to avoid some nasty recursive type behaviour.
* When dispatching in a thread and we want to return to it then it needs
* to finish.
*/
#if defined(__sparc__)
if ( _CPU_ISR_Dispatch_disable )
retval = 0;
#endif
_ISR_Enable_on_this_core( level );
_Thread_Dispatch_decrement_disable_level();
if ( retval == 0 )
_SMP_Request_other_cores_to_dispatch();
return retval;
}
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