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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. 2011,2013 */
/* */
/* 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 otherwise */
/* divested of its trade secrets, irrespective of what has been */
/* deposited with the U.S. Copyright Office. */
/* */
/* Origin: 30 */
/* */
/* IBM_PROLOG_END_TAG */
#include <kernel/intmsghandler.H>
#include <sys/msg.h>
#include <util/singleton.H>
#include <kernel/console.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* VFS_ROOT_MSG_INTR = "/msg/interrupt";
InterruptMsgHdlr * InterruptMsgHdlr::cv_instance = NULL;
uint64_t InterruptMsgHdlr::cv_ipc_base_address = 0;
void InterruptMsgHdlr::create(MessageQueue * i_msgQ, uint64_t i_ipc_addr)
{
cv_ipc_base_address = i_ipc_addr;
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()
{
uint64_t pir = getPIR();
if( cv_ipc_base_address != 0 )
{
uint64_t xirrAddress = cv_ipc_base_address;
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 *)pir,
(void *)xirr,
NULL);
}
}
if(cv_ipc_base_address == 0 || cv_instance == NULL)
{
static bool hit = false;
// print the message once
if(!hit)
{
printk("InterrurptMsgHdlr got called before IPC was setup\n");
hit = true;
}
// 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.
}
}
void InterruptMsgHdlr::addCpuCore(uint64_t i_pir)
{
task_t* t = TaskManager::getCurrentTask();
if(cv_instance)
{
// To avoid conflict with interrupts on thread i_pir, change the key
// for the message to be an invalid PIR.
uint64_t pir_key = i_pir | 0x8000000000000000ul;
cv_instance->sendMessage(MSG_INTR_ADD_CPU,
(void*)pir_key,(void *)i_pir,t);
}
}
void InterruptMsgHdlr::sendIPI(uint64_t i_pir)
{
uint64_t mfrrAddress = cv_ipc_base_address;
mfrrAddress += mmio_offset(i_pir);
mfrrAddress += MFRR_ADDR_OFFSET;
register uint8_t data = 0;
eieio(); sync();
MAGIC_INSTRUCTION(MAGIC_SIMICS_CORESTATESAVE);
asm volatile("stbcix %0,0,%1" :: "r" (data) , "r" (mfrrAddress));
}
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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