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CONFIG_X86_UP_APIC: Local APIC support on uniprocessors

General informations

The Linux kernel configuration item CONFIG_X86_UP_APIC has multiple definitions:

Local APIC support on uniprocessors found in arch/i386/Kconfig

The configuration item CONFIG_X86_UP_APIC:

Help text

A local APIC (Advanced Programmable Interrupt Controller) is an integrated interrupt controller in the CPU. If you have a single-CPU system which has a processor with a local APIC, you can say Y here to enable and use it. If you say Y here even though your machine doesn't have a local APIC, then the kernel will still run with no slowdown at all. The local APIC supports CPU-generated self-interrupts (timer, performance counters), and the NMI watchdog which detects hard lockups.

Local APIC support on uniprocessors found in arch/x86/Kconfig

The configuration item CONFIG_X86_UP_APIC:

Help text

A local APIC (Advanced Programmable Interrupt Controller) is an integrated interrupt controller in the CPU. If you have a single-CPU system which has a processor with a local APIC, you can say Y here to enable and use it. If you say Y here even though your machine doesn't have a local APIC, then the kernel will still run with no slowdown at all. The local APIC supports CPU-generated self-interrupts (timer, performance counters), and the NMI watchdog which detects hard lockups.

Hardware

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