From owner-cvs-all  Fri Sep 14  3:23:37 2001
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Date: Fri, 14 Sep 2001 20:22:42 +1000 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: Warner Losh <imp@harmony.village.org>
Cc: Marcel Moolenaar <marcel@xcllnt.net>,
	KATO Takenori <kato@nendai.nagoya-u.ac.jp>, <ru@FreeBSD.org>,
	<cvs-committers@FreeBSD.org>, <cvs-all@FreeBSD.org>
Subject: Re: hw.machine vs hw.machine_arch 
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On Fri, 14 Sep 2001, Warner Losh wrote:

> In message <20010913224828.B8717@dhcp01.pn.xcllnt.net> Marcel Moolenaar writes:
> : I don't have a pc98 to check, but I don't see the evidence in the
> : code that hw.machine=pc98 on pc98. Please check.
>
> These are both i386 on my pc98 machine, but I may have messed up when
> building the kernel on my FreeBSD/i386 machine.

It's certainly i386.  UTSL :-)

> : Also, given the above definition, what remains of the function of
> : the hw.ispc98 MIB?
>
> machdep.ispc98 you mean?  That is 0 on my FreeBSD/i386 boxes and 1 on
> my pc98 machines.

machdep.ispc98 is used mainly to give an unusual setting of ${MACHINE} for
make(1).  From make/main.c:

#if defined(__i386__) && defined(__FreeBSD_version) && \
    __FreeBSD_version > 300003
	/*
	 * PC-98 kernel sets the `i386' string to the utsname.machine and
	 * it cannot be distinguished from IBM-PC by uname(3).  Therefore,
	 * we check machine.ispc98 and adjust the machine variable before
	 * using usname(3) below.
	 * NOTE: machdep.ispc98 was defined on 1998/8/31. At that time,
	 * __FreeBSD_version was defined as 300003. So, this check can
	 * safely be done with any kernel with version > 300003.
	 */
	if (!machine) {
		int	ispc98;
		size_t	len;

		len = sizeof(ispc98);
		if (!sysctlbyname("machdep.ispc98", &ispc98, &len, NULL, 0)) {
			if (ispc98)
				machine = "pc98";
		}
	}
#endif

Note that this doesn't break cross-building.  It is just for convenience,
so that you don't have to remember to set MACHINE explitly when building
pc98 userland with a pc98 kernel.  But it is just confusing in other
configurations.

Bruce


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