linux-kernel - Re: [PATCH] x86: Get irq for hpet timer

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Message-ID: <Pine.LNX.4.55.0805221609280.13339@cliff.in.clinika.pl>
Date:	Thu, 22 May 2008 16:25:16 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Kevin Hao <kexin.hao@...driver.com>
cc:	Clemens Ladisch <clemens@...isch.de>,
	venkatesh.pallipadi@...el.com, bob.picco@...com, mingo@...hat.com,
	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	Balaji Rao <balajirrao@...il.com>
Subject: Re: [PATCH] x86: Get irq for hpet timer

On Thu, 22 May 2008, Kevin Hao wrote:

> But if we avoid all the legacy range, the hpet timer will have no chance
> to work on a host using legacy PIC.

 It's not meant to be wired to the legacy PIC anyway (except from the
timers #0 and #1 in some configurations, meant to emulate timer interrupts
of the 8254 and the RTC), though I can imagine such a non-standard
extension.

> Yes, we should setup routing in the I/O APIC and use level-triggered
> mode. I think it's better to use acpi_register_gsi than mp_register_gsi.
> Is that right?

 It sounds right to me.

  Maciej
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