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Diffstat (limited to 'Documentation/Configure.help')
| -rw-r--r-- | Documentation/Configure.help | 33 |
1 files changed, 23 insertions, 10 deletions
diff --git a/Documentation/Configure.help b/Documentation/Configure.help index dcb1390f6568..599a550017f5 100644 --- a/Documentation/Configure.help +++ b/Documentation/Configure.help @@ -120,17 +120,30 @@ CONFIG_SMP If you don't know what to do here, say N. -APIC and IO-APIC Support on Uniprocessors +IO-APIC Support on Uniprocessors CONFIG_X86_UP_IOAPIC - APIC (Advanced Programmable Interrupt Controller) is a scheme for - delivering hardware interrupt requests to the CPU. It is commonly - used on systems with several CPU's. If you have a single-CPU system - which uses APIC, you can say Y here to use it. If you say Y here - even though your machine doesn't have APIC, then the kernel will - still run with no slowdown at all. - - If you have system with several CPU's, you do not need to say Y - here: APIC will be used automatically. + An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an + SMP-capable replacement for PC-style interrupt controllers. Most + SMP systems and a small number of uniprocessor systems have one. + If you have a single-CPU system with an IO-APIC, you can say Y here + to use it. If you say Y here even though your machine doesn't have + an IO-APIC, then the kernel will still run with no slowdown at all. + + If you have a system with several CPUs, you do not need to say Y + here: the IO-APIC will be used automatically. + +Local APIC Support on Uniprocessors +CONFIG_X86_UP_APIC + 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. + + If you have a system with several CPUs, you do not need to say Y + here: the local APIC will be used automatically. Kernel math emulation CONFIG_MATH_EMULATION |