Date: 16 Dec 1997 23:25:52 +0100 From: Eivind Eklund <perhaps@yes.no> To: Dale Walker <dale@icr.com.au>, Jason Evans <jasone@cannonware.com> Cc: freebsd-sparc@FreeBSD.ORG Subject: Re: FAQ FreeBSD-Sparc [frequent posting] Message-ID: <86sort9b7z.fsf@bitbox.follo.net> In-Reply-To: Dale Walker's message of Tue, 16 Dec 1997 23:52:43 %2B1000 (EST) References: <199712161352.XAA11649@fantasy.icr.com.au>
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[Jason Evans (jasone@cannonware.com)]
> There is talk of a source tree restructuring, but my feeling is that we
> should put this off as long as possible, so that when we do it, we have a
> good idea of what we're trying to achieve.
Just FYI: There is support for multiple architectures in bsd.subdir.mk
already - if a <directory>.${MACHINE} exists, it will be preferred
over the general version.
> There is discussion of how to make bus interfaces abstracted in the kernel.
John Mark Gurney <jmg@freebsd.org> is probably your best contact on
this, possible along with Jason Thorpe of NetBSD (jason@netbsd.org).
> Assumptions about the size of int will need fixed.
OK, what assumptions are correct on UltraSPARC? (Here comes a set of
possible assumptions; could you try to say which are wrong, and I'll
try to fix the places where some of them occur?)
1. (void*)(int)(void*) is lossless AKA
Pointers can be stored in an int
2. (void*)(long)(void*) is lossless AKA
Pointers can be stored in a long
4. (void*)(any type*)(void*) is lossless AKA
Different pointer types are equal
8. sizeof(int) == sizeof(long)
16. sizeof(short)*CHAR_BIT == 16
32. sizeof(int)*CHAR_BIT == 32
64. sizeof(int) == 2*sizeof(short)
128. sizeof(long) == 2*sizeof(short)
Just add up the numbers of the points that are wrong and give us the
sum :-) (Feel free to add more points by the same scheme first)
Eivind.
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