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// IBM_PROLOG_BEGIN_TAG
// This is an automatically generated prolog.
//
// $Source: src/kernel/cpumgr.C $
//
// IBM CONFIDENTIAL
//
// COPYRIGHT International Business Machines Corp. 2010 - 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 <assert.h>
#include <kernel/cpumgr.H>
#include <kernel/task.H>
#include <kernel/cpu.H>
#include <kernel/scheduler.H>
#include <kernel/taskmgr.H>
#include <kernel/pagemgr.H>
#include <kernel/console.H>
#include <util/singleton.H>
#include <arch/ppc.H>
#include <kernel/timemgr.H>
#include <sys/sync.h>
#include <kernel/cpuid.H>
#include <kernel/ptmgr.H>
cpu_t* CpuManager::cv_cpus[CpuManager::MAXCPUS] = { NULL };
bool CpuManager::cv_shutdown_requested = false;
uint64_t CpuManager::cv_shutdown_status = 0;
CpuManager::CpuManager()
{
for (int i = 0; i < MAXCPUS; i++)
cv_cpus[i] = NULL;
}
cpu_t* CpuManager::getCurrentCPU()
{
return cv_cpus[getPIR()];
}
cpu_t* CpuManager::getMasterCPU()
{
for (int i = 0; i < MAXCPUS; i++)
if (cv_cpus[i] != NULL)
if (cv_cpus[i]->master)
return cv_cpus[i];
return NULL;
}
void CpuManager::init()
{
// For the initial boot we only want to set up CPU objects for the threads
// on this core. Otherwise we waste memory with kernel / idle task stacks.
//
// As long as the CPU object pointer is NULL, the start.S code won't
// enter the kernel, so we skip initializing all the other CPUs for now.
// Determine number of threads on this core.
size_t threads = -1;
switch (CpuID::getCpuType())
{
case CORE_POWER7:
case CORE_POWER7_PLUS:
threads = 4;
break;
case CORE_POWER8_VENICE:
case CORE_POWER8_SALERNO:
threads = 8;
break;
case CORE_UNKNOWN:
default:
kassert(false);
break;
}
// Create CPU objects starting at the thread-0 for this core.
size_t baseCpu = getPIR() & ~(threads-1);
for (size_t i = 0; i < threads; i++)
Singleton<CpuManager>::instance().startCPU(i + baseCpu);
}
void CpuManager::init_slave_smp(cpu_t* cpu)
{
Singleton<CpuManager>::instance().startSlaveCPU(cpu);
}
void CpuManager::requestShutdown(uint64_t i_status)
{
cv_shutdown_requested = true;
cv_shutdown_status = i_status;
}
void CpuManager::startCPU(ssize_t i)
{
bool currentCPU = false;
if (i < 0)
{
i = getCpuId();
currentCPU = true;
}
else if (getCpuId() == (uint64_t)i)
{
currentCPU = true;
}
// Initialize CPU structure.
if (NULL == cv_cpus[i])
{
printk("Starting CPU %ld...", i);
cpu_t* cpu = cv_cpus[i] = new cpu_t;
// Initialize CPU.
cpu->cpu = i;
if (currentCPU)
{
cpu->master = true;
}
else
{
cpu->master = false;
}
cpu->scheduler = &Singleton<Scheduler>::instance();
cpu->scheduler_extra = NULL;
cpu->kernel_stack =
(void*) (((uint64_t)PageManager::allocatePage(4)) + 16320);
cpu->xscom_mutex = (mutex_t)MUTEX_INITIALIZER;
// Create idle task.
cpu->idle_task = TaskManager::createIdleTask();
cpu->idle_task->cpu = cpu;
cpu->periodic_count = 0;
printk("done\n");
}
if (currentCPU)
{
setDEC(TimeManager::getTimeSliceCount());
}
return;
}
void CpuManager::startSlaveCPU(cpu_t* cpu)
{
setDEC(TimeManager::getTimeSliceCount());
return;
}
void CpuManager::executePeriodics(cpu_t * i_cpu)
{
if(i_cpu->master)
{
++(i_cpu->periodic_count);
if(0 == (i_cpu->periodic_count % CPU_PERIODIC_CHECK_MEMORY))
{
uint64_t pcntAvail = PageManager::queryAvail();
if(pcntAvail < 16) // Less than 16% pages left TODO 16 ok?
{
VmmManager::flushPageTable();
++(i_cpu->periodic_count); // prevent another flush below
if(pcntAvail < 5) // TODO 5% ok
{
VmmManager::castOutPages(VmmManager::CRITICAL);
}
else
{
VmmManager::castOutPages(VmmManager::NORMAL);
}
}
}
if(0 == (i_cpu->periodic_count % CPU_PERIODIC_FLUSH_PAGETABLE))
{
VmmManager::flushPageTable();
}
}
}
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