linux-kernel - Re: [PATCH] x86: Bypass legacy PIC and PIT on ACPI hardware reduced platform

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Message-ID: <1425571609.3838.153.camel@linux.intel.com>
Date:	Thu, 05 Mar 2015 16:06:49 +0000
From:	Alan Cox <alan@...ux.intel.com>
To:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, Len.Brown@...el.com,
	x86@...nel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Bypass legacy PIC and PIT on ACPI hardware reduced
 platform

> I'll do more investigation above items but I want to leave at least
> these two as the quirk today unless I am convinced I can do that because
> from my understanding, UEFI runtime services should not be supported in
> reduced hw mode.

What actually matters in this space is what Microsoft does. The spec is
unfortunately rather irrelevant. If MS do UEFI runtime services in
reduced hw mode then the firmware and system will do so.

Alan


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