linux-kernel - Re: [PATCH][EFI] Run EFI in physical mode

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Message-ID: <AANLkTim8U87uZ73BcFc42O6EFWuNkA5UjhhiNeVLtAWT@mail.gmail.com>
Date:	Fri, 13 Aug 2010 16:36:03 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Takao Indoh <indou.takao@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"vgoyal@...hat.com" <vgoyal@...hat.com>,
	"nhorman@...driver.com" <nhorman@...driver.com>
Subject: Re: [PATCH][EFI] Run EFI in physical mode

On Fri, Aug 13, 2010 at 4:16 PM, H. Peter Anvin <hpa@...or.com> wrote:
> I guess my real question was "is this something IA64 could benefit from
> and/or could we make the IA64 code more similar to the x86 bits"?

If Eric's recollection about the "weird floating point fixup routines"[1]
performance issues are correct - then ia64 won't want to do this.

-Tony

[1] more usually called FPSWA - floating point software assist - which
handle a bunch or corner cases in denormalized floating point values
that the h/w doesn't cover.
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