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More info can be found in [https://books.google.nl/books?id=TVzjEZg1--YC&printsec=frontcover "Pentium Processor System Architecture. Chapter 15: The APIC"]
== SIPI Sequence ==
The INIT-SIPI sequence is done by the operating system after the firmware already gives the first INIT signal. This example code from the [ Silcos Kernel http://wiki.osdev.org/Silcos_Kernel]
<source lang="C">
void APIC::wakeupSequence(U32 apicId, U8 pvect)
{
ICRHigh hreg = {
.destField = apicId
};
ICRLow lreg(DeliveryMode::INIT, Level::Deassert, TriggerMode::Edge);
xAPICDriver::write(APIC_REGISTER_ICR_HIGH, hreg.value);
xAPICDriver::write(APIC_REGISTER_ICR_LOW, lreg.value);
lreg.vectorNo = pvect;
lreg.delvMode = DeliveryMode::StartUp;
Dbg("APBoot: Wakeup sequence following...");
xAPICDriver::write(APIC_REGISTER_ICR_HIGH, hreg.value);
xAPICDriver::write(APIC_REGISTER_ICR_LOW, lreg.value);
}
// NOTE: ICRLow and ICRHigh are types in the Silcos kernel. If your code uses direct bit
// manipulations you must replace some code with bit operations.
</source>
== See Also ==
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