setup_IO_APIC

Name:setup_IO_APIC

Proto:void __init setup_IO_APIC(void)

Type:void

Parameter:Nothing

2361

If skip_ioapic_setup || Not nr_ioapics Then Return

2364

Not all IRQs can be routed through the IO-APIC, eg. on certain (older)* boards the timer interrupt is not really connected to any IO-APIC pin,* it's fed to the master 8259A's IR0 line only. = If nr_legacy_irqs() Then ~Traditionally ISA IRQ2 is the cascade IRQ, and is not available* to devices. However there may be an I/O APIC pin available for* this interrupt regardless. The pin may be left unconnected, but* typically it will be reused as an ExtINT cascade interrupt for Else ~0UL

2366

Define the default level of output to be very little* This can be turned up by using apic=verbose for more* information and apic=debug for _lots_ of information.* apic_verbosity is defined in apic.c(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n")

2367

for_each_ioapic(ioapic)

2368

BUG_ON(mp_irqdomain_create(ioapic))

2373

setup_ioapic_ids()

2375

sync_Arb_IDs - synchronize APIC bus arbitration IDs

2376

setup_IO_APIC_irqs()

2377

init_IO_APIC_traps()

2378

If nr_legacy_irqs() Then This code may look a bit paranoid, but it's supposed to cooperate with* a wide range of boards and BIOS bugs. Fortunately only the timer IRQ* is so screwy. Thanks to Brian Perkins for testing/hacking this beast* fanatically on his truly buggy board.

2381

ioapic_initialized = 1

**Caller**
Name	Describe
apic_bsp_setup

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