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Date: Fri, 16 Jan 2009 22:42:55 -0700 (MST)
Message-Id: <20090116.224255.1021546144.imp@bsdimp.com>
Subject: Re: [Qemu-devel] [PATCH] Support epoch of 1980 in RTC emulation
	for MIPS Magnum
From: "M. Warner Losh" <imp@bsdimp.com>
In-Reply-To: <20090117013919.GA14281@miranda.arrow>
References: <20090111173701.GA5213@miranda.arrow>
	<20090111.104733.-974214510.imp@bsdimp.com>
	<20090117013919.GA14281@miranda.arrow>
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To: qemu-devel@nongnu.org, sdbrady@ntlworld.com

In message: <20090117013919.GA14281@miranda.arrow>
            Stuart Brady <sdbrady@ntlworld.com> writes:
: On Sun, Jan 11, 2009 at 10:47:33AM -0700, M. Warner Losh wrote:
: > In message: <20090111173701.GA5213@miranda.arrow>
: >             Stuart Brady <sdbrady@ntlworld.com> writes:
: > : I've not modified the handling of the century byte, as I'm not entirely
: > : sure what's required.  With an epoch of 1980 and a year of 2009, you
: > : could argue that the century byte should hold either 0, 1, 19 or 20.
: > 
: > What does WinNT/mips expect?
: 
: I've been informed that WinNT 3.50/MIPS does not read the century byte,
: and I expect that other versions do the same, as an epoch of 1980 will
: won't break until 2080.

OpenBSD/arc and NetBSD/arc then would be the only other ones that
might care.  OpenBSD/arc is hard for me to check on, since it is so
old.

NetBSD/arc uses a common set of routines to read it, so it is a little
hard to trace through.  But my quick look shows that there's no
function to read the centry set, so the common code will never read
the centry byte.

Warner