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/x86/Kconfig

The configuration item CONFIG_X86_UP_APIC:

• prompt: Local APIC support on uniprocessors
• type: bool
• depends on: (! CONFIG_PCI_MSI ) && ( CONFIG_X86_32 && ! CONFIG_SMP && ! CONFIG_X86_32_NON_STANDARD )
• defined in arch/x86/Kconfig
• found in Linux kernels: 2.6.24–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

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/i386/Kconfig

The configuration item CONFIG_X86_UP_APIC:

• prompt: Local APIC support on uniprocessors
• type: bool
• depends on: ! CONFIG_SMP && !( CONFIG_X86_VISWS || CONFIG_X86_VOYAGER || CONFIG_X86_GENERICARCH )
• defined in arch/i386/Kconfig
• found in Linux kernels: 2.5.45–2.5.75, 2.6.0–2.6.23

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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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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