Enable hpet support in unix

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LEARN ABOUT FREEBSD

apic

APIC(4) 						   BSD Kernel Interfaces Manual 						   APIC(4)

NAME

     apic -- Advanced Programmable Interrupt Controller (APIC) driver

SYNOPSIS

     This driver is a mandatory part of amd64 kernel.  To compile this driver into i386 or pc98 kernel, place the following line in your kernel
     configuration file:

	   device apic

     The following tunable is settable from the loader(8):

     hint.apic.X.clock
     controls event timers functionality support. Setting to 0, disables it.  Default value is 1.

     hint.apic.X.disabled
     Set this to 1 to disable APIC support, falling back to the legacy PIC.

DESCRIPTION

     There are two components in the Intel APIC system, the local APIC (LAPIC) and the I/O APIC.  There is one local APIC in each CPU in the sys-
     tem.  There is typically one I/O APIC for each peripheral bus in the system.

     Local APICs manage all external interrupts for a specific processor.  In addition, they are able to accept and generate inter-processor
     interrupts (IPIs).

     I/O APICs contain a redirection table, which is used to route the interrupts they receive from peripheral buses to one or more local APICs.

     Each local APIC includes one 32-bit programmable timer.  This driver uses them to supply kernel with one event timer named "LAPIC".  Event
     timer provided by the driver supports both one-shot an periodic modes.  Because of local APIC nature it is per-CPU.  The timer frequency is
     not reported by the platform and so automatically measured by the driver on the first use.  Depending on CPU model this timer may stop in C3
     and deeper CPU sleep states.  Driver automatically adjusts event timer priority and reports it to prevent entering dangerous sleep states
     when it is used.

SEE ALSO

     atrtc(4), attimer(4), eventtimers(4), hpet(4)

BSD
								 December 20, 2011							       BSD

UNIX for Dummies Questions & Answers