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// IBM_PROLOG_BEGIN_TAG
// This is an automatically generated prolog.
//
// $Source: src/kernel/intmsghandler.C $
//
// IBM CONFIDENTIAL
//
// COPYRIGHT International Business Machines Corp. 2011
//
// p1
//
// Object Code Only (OCO) source materials
// Licensed Internal Code Source Materials
// IBM HostBoot Licensed Internal Code
//
// The source code for this program is not published or other-
// wise divested of its trade secrets, irrespective of what has
// been deposited with the U.S. Copyright Office.
//
// Origin: 30
//
// IBM_PROLOG_END
#include <kernel/intmsghandler.H>
#include <sys/msg.h>
#include <util/singleton.H>
#include <kernel/console.H>
#include <sys/interrupt.h>
#include <util/lockfree/atomic_construct.H>
#include <kernel/task.H>
#include <kernel/taskmgr.H>
#include <kernel/cpu.H>
#include <kernel/scheduler.H>
#include <arch/ppc.H>
const char* INTR_MSGQ = "/msg/interrupt";
InterruptMsgHdlr * InterruptMsgHdlr::cv_instance = NULL;
void InterruptMsgHdlr::create(MessageQueue * i_msgQ)
{
if(cv_instance)
{
// TODO should this be considered an unrecoverable error?
// i_msgQ has already been changed by the syscall, so we either have to
// make a new InterrupMsgHdlr object to match the new queue or we halt
// the system.
printk("WARNING replacing existing Interrupt handler!\n");
InterruptMsgHdlr* instance = cv_instance;
while(instance != NULL)
{
if(__sync_bool_compare_and_swap(&cv_instance, instance, NULL))
{
delete instance;
}
instance = cv_instance;
}
}
// Atomically construct.
if (__sync_bool_compare_and_swap(&cv_instance, NULL, NULL))
{
InterruptMsgHdlr* instance = new InterruptMsgHdlr(i_msgQ);
if (!__sync_bool_compare_and_swap(&cv_instance, NULL, instance))
{
delete instance;
}
}
}
void InterruptMsgHdlr::handleInterrupt()
{
// Save the current task in case we context-switch away when sending
// the message.
task_t* t = TaskManager::getCurrentTask();
uint64_t pir = getPIR();
uint64_t xirrAddress = (static_cast<uint64_t>(ICPBAR_VAL) << 20);
xirrAddress += mmio_offset(pir); // Add offset for this cpu
xirrAddress += XIRR_ADDR_OFFSET; // Add offset for XIRR register
// Ignore HRMOR setting
xirrAddress |= 0x8000000000000000ul;
uint32_t xirr = 0;
printkd ("XirrAddr %lx\n",xirrAddress);
// Reading this register acknowledges the interrupt and deactivates the
// external interrupt signal to the processor. The XIRR is now locked
// and can't be pre-empted by a "more favored" interrupt.
// This is a cache-inhibited load from hypervisor state.
// lwzcix BOP1,Ref_G0,BOP2
asm volatile("lwzcix %0, 0, %1"
: "=r" (xirr) // output, %0
: "r" (xirrAddress) // input, %1
: ); // no impacts
if(cv_instance)
{
cv_instance->sendMessage(MSG_INTR_EXTERN,
(void *)xirr,
(void *)pir,
NULL);
}
// else we got an external interrupt before we got things set up.
// TODO Is there anything that can be done other than
// leave the interrupt presenter locked.
// Does the code that sets up the IP registers need to check to see if
// there is an interrupt sitting there and send an EOI?
// Story 41868 - Mask off all interrupts very early - might
// resolve this TODO.
// Return the task to the scheduler queue if we did a context-switch.
if (TaskManager::getCurrentTask() != t)
{
t->cpu->scheduler->addTask(t);
}
}
// TODO where does this get called from? (story 39878)
void InterruptMsgHdlr::addCpuCore(uint64_t i_pir)
{
// Save the current task in case we context-switch away when sending
// the message.
task_t* t = TaskManager::getCurrentTask();
if(cv_instance)
{
cv_instance->sendMessage(MSG_INTR_ADD_CPU,(void *)i_pir,NULL,NULL);
}
// Return the task to the scheduler queue if we did a context-switch.
if (TaskManager::getCurrentTask() != t)
{
t->cpu->scheduler->addTask(t);
}
}
MessageHandler::HandleResult InterruptMsgHdlr::handleResponse
(
msg_sys_types_t i_type,
void* i_key,
task_t* i_task,
int i_rc
)
{
return UNHANDLED_RC;
}
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