From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
To: Matthew Garrett
<matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
Cc: "linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org"
<matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH] UEFI: Don't use UEFI time services on 32-bit
Date: Tue, 10 Dec 2013 15:51:49 -0800 [thread overview]
Message-ID: <52A7A915.1070701@zytor.com> (raw)
In-Reply-To: <1386717862.26245.5.camel@x230>
On 12/10/2013 03:24 PM, Matthew Garrett wrote:
>>
>> TAD would also give us the timezone. I'm not sure how you can
>> realistically only use the time function during boot, however, unless
>> you inherently assume it is coherent with the hardware RTC, since you
>> wouldn't be able to set it.
>
> If we can verify that Windows actually uses TAD then I'd agree it's
> preferable to EFI, but if we can't then I wouldn't be so sure. I'll redo
> my Windows instrumentation and figure out under which circumstances it's
> calling the time functions.
>
Well, *which version* of Windows is a big question here. Keep in mind
that the TAD was only introduced with ACPI 5 so it is quite a new
feature. I would really like to see it implemented in SeaBIOS and/or
OVMF so we can test it out in Qemu.
-hpa
next prev parent reply other threads:[~2013-12-10 23:51 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-29 19:44 [PATCH] UEFI: Don't use UEFI time services on 32-bit Matthew Garrett
[not found] ` <1385754283-2464-1-git-send-email-matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
2013-11-29 22:04 ` joeyli
[not found] ` <1385762647.3539.4.camel-ONCj+Eqt86TasUa73XJKwA@public.gmane.org>
2013-11-29 22:30 ` Borislav Petkov
2013-12-05 10:56 ` Matt Fleming
2013-11-30 1:45 ` H. Peter Anvin
[not found] ` <52994324.4000404-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-12-10 22:54 ` H. Peter Anvin
[not found] ` <52A79B9A.7080004-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-12-10 22:58 ` Matthew Garrett
2013-12-10 23:20 ` H. Peter Anvin
[not found] ` <52A7A1B0.7050903-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-12-10 23:24 ` Matthew Garrett
2013-12-10 23:51 ` H. Peter Anvin [this message]
[not found] ` <52A7A915.1070701-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-12-11 0:20 ` joeyli
[not found] ` <1386721257.3539.1717.camel-ONCj+Eqt86TasUa73XJKwA@public.gmane.org>
2013-12-11 4:00 ` H. Peter Anvin
2013-12-10 23:22 ` [tip:x86/urgent] x86, efi: Don't use (U) EFI time services on 32 bit tip-bot for Matthew Garrett
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