2013-12-17 18:10:02 +01:00
|
|
|
/*
|
2014-03-11 01:21:56 +01:00
|
|
|
* \brief A multiplexable common instruction processor
|
2013-12-17 18:10:02 +01:00
|
|
|
* \author Martin Stein
|
|
|
|
* \date 2014-01-14
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Copyright (C) 2014 Genode Labs GmbH
|
|
|
|
*
|
|
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
|
|
* under the terms of the GNU General Public License version 2.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* core includes */
|
2014-03-03 15:29:05 +01:00
|
|
|
#include <kernel/processor.h>
|
2014-03-11 01:21:56 +01:00
|
|
|
#include <kernel/irq.h>
|
|
|
|
#include <pic.h>
|
|
|
|
#include <timer.h>
|
2013-12-17 18:10:02 +01:00
|
|
|
|
|
|
|
using namespace Kernel;
|
|
|
|
|
2014-03-11 01:21:56 +01:00
|
|
|
namespace Kernel
|
|
|
|
{
|
|
|
|
Pic * pic();
|
|
|
|
Timer * timer();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void Kernel::Processor_client::_interrupt(unsigned const processor_id)
|
|
|
|
{
|
|
|
|
/* determine handling for specific interrupt */
|
|
|
|
unsigned irq_id;
|
|
|
|
Pic * const ic = pic();
|
|
|
|
if (ic->take_request(irq_id))
|
|
|
|
{
|
|
|
|
/* check wether the interrupt is a processor-scheduling timeout */
|
|
|
|
if (timer()->interrupt_id(processor_id) == irq_id) {
|
|
|
|
|
|
|
|
__processor->scheduler()->yield_occupation();
|
|
|
|
timer()->clear_interrupt(processor_id);
|
|
|
|
|
|
|
|
/* check wether the interrupt is our inter-processor interrupt */
|
|
|
|
} else if (ic->is_ip_interrupt(irq_id, processor_id)) {
|
|
|
|
|
2014-03-11 12:53:42 +01:00
|
|
|
__processor->ip_interrupt();
|
2014-03-11 01:21:56 +01:00
|
|
|
|
|
|
|
/* after all it must be a user interrupt */
|
|
|
|
} else {
|
|
|
|
|
|
|
|
/* try to inform the user interrupt-handler */
|
|
|
|
Irq::occurred(irq_id);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* end interrupt request at controller */
|
|
|
|
ic->finish_request();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2014-03-11 12:53:42 +01:00
|
|
|
void Kernel::Processor_client::_schedule() { __processor->schedule(this); }
|
|
|
|
|
|
|
|
|
|
|
|
void Kernel::Processor::schedule(Processor_client * const client)
|
2014-03-11 01:21:56 +01:00
|
|
|
{
|
2014-03-11 13:31:25 +01:00
|
|
|
if (_id != executing_id()) {
|
2014-03-11 01:21:56 +01:00
|
|
|
|
2014-03-11 15:58:31 +01:00
|
|
|
/*
|
|
|
|
* Remote add client and let target processor notice it if necessary
|
|
|
|
*
|
|
|
|
* The interrupt controller might provide redundant submission of
|
|
|
|
* inter-processor interrupts. Thus its possible that once the targeted
|
|
|
|
* processor is able to grab the kernel lock, multiple remote updates
|
|
|
|
* occured and consequently the processor traps multiple times for the
|
|
|
|
* sole purpose of recognizing the result of the accumulative changes.
|
|
|
|
* Hence, we omit further interrupts if there is one pending already.
|
|
|
|
* Additionailly we omit the interrupt if the insertion doesn't
|
|
|
|
* rescind the current scheduling choice of the processor.
|
|
|
|
*/
|
2014-03-11 13:31:25 +01:00
|
|
|
if (_scheduler.insert_and_check(client) && !_ip_interrupt_pending) {
|
|
|
|
pic()->trigger_ip_interrupt(_id);
|
|
|
|
_ip_interrupt_pending = true;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
|
|
|
|
/* add client locally */
|
|
|
|
_scheduler.insert(client);
|
2014-03-11 01:21:56 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void Kernel::Processor_client::_unschedule()
|
|
|
|
{
|
|
|
|
assert(__processor->id() == Processor::executing_id());
|
|
|
|
__processor->scheduler()->remove(this);
|
|
|
|
}
|
|
|
|
|
2013-12-17 18:10:02 +01:00
|
|
|
|
2014-03-11 01:21:56 +01:00
|
|
|
void Kernel::Processor_client::_yield()
|
2013-12-17 18:10:02 +01:00
|
|
|
{
|
2014-03-11 01:21:56 +01:00
|
|
|
assert(__processor->id() == Processor::executing_id());
|
|
|
|
__processor->scheduler()->yield_occupation();
|
2013-12-17 18:10:02 +01:00
|
|
|
}
|