internal static void ApicTimer(PMTimer pmTimer, ApicTimer apicTimer)
{
apicTimer.SetDivisor(1);
apicTimer.SetOneShot();
apicTimer.SetInterruptEnabled(false);
apicTimer.SetInitialCount(~0u);
uint apicLast = apicTimer.Value;
uint pmLast = pmTimer.Value;
uint pmLimit = PMTimer.FrequencyHz / 15;
uint pmAccum = 0;
uint apicNow = 0;
// Initial measurements
apicLast = apicTimer.Value;
pmLast = pmTimer.Value;
do
{
apicNow = apicTimer.Value;
uint pmNow = pmTimer.Value | 0xff000000;
pmAccum += PmDelta(pmNow, pmLast);
pmLast = pmNow;
} while (pmAccum < pmLimit);
ulong apicHz = PMTimer.FrequencyHz * (ulong)(apicLast - apicNow) / pmAccum;
DebugStub.Print("Cpu{0}: APIC timer frequency {1} Hz\n",
__arglist(Processor.CurrentProcessor.Id, apicHz));
apicTimer.SetBusFrequency((uint)apicHz);
}
public override void ReleaseResources()
{
rtClock.ReleaseResources();
rtClock = null;
halTimer.ReleaseResources();
halTimer = null;
halPic.ReleaseResources();
halPic = null;
pic.ReleaseResources();
pic = null;
}
private void InitializeBsp(Processor rootProcessor)
{
DebugStub.Print("HalDevicesApic.Initialize()\n");
pmTimer = AcpiTables.GetPMTimer();
// Get PIC resources. Pic is masked by default.
PnpConfig picConfig
= (PnpConfig)IoSystem.YieldResources("/pnp/PNP0000", typeof(PicStub));
pic = new PicStub(picConfig);
pic.Initialize(PicBaseVector);
// Parse MP Table and create IO apics
MpResources.ParseMpTables();
ioApics = IoApic.CreateIOApics();
halPic = new Apic(ioApics);
halPic.Initialize(ApicBaseVector);
// Apic timer is used to provide one-shot timer interrupts.
halTimer = new ApicTimer(halPic);
halTimer.Initialize();
// Calibrate timers
Calibrate.CpuCycleCounter(pmTimer);
Calibrate.ApicTimer(pmTimer, halTimer);
// Legacy timer is used to time stalls when starting CPUs.
PnpConfig i8254Config
= (PnpConfig)IoSystem.YieldResources("/pnp/PNP0100", typeof(Timer8254Apic));
stallTimer = new Timer8254Apic(i8254Config);
// Real-time clock
PnpConfig rtClockConfig
= (PnpConfig)IoSystem.YieldResources("/pnp/PNP0B00", typeof(RTClockApic));
rtClock = new RTClockApic(rtClockConfig, halPic);
// Compose our HalClock from the component clocks we have available
halClock = new HalClockApic(halPic, rtClock, new PMClock(pmTimer));
SystemClock.Initialize(halClock, TimeSpan.FromHours(8).Ticks);
rootProcessor.AddPic(halPic);
rootProcessor.AddTimer(halTimer.Interrupt, halTimer);
rootProcessor.AddClock(halClock.Interrupt, halClock);
InitializeProcessorCount();
DebugReportProcessors();
halTimer.Start();
// Get the screen resources. Since we have metadata above to
// declare all fixed resources used by the screen,
// YieldResources("") will keep the resource tracking correct:
halScreen = new HalScreenDirect(IoSystem.YieldResources("", typeof(HalScreen)));
Console.Screen = (HalScreen)halScreen;
halPic.DumpState();
foreach (IoApic ioApic in ioApics)
{
ioApic.DumpRedirectionEntries();
}
pic.DumpRegisters();
}
