cvs commit: src/lib/libc/i386/net htonl.S ntohl.S

[Erik Trulsson]

On Mon, Oct 18, 2004 at 10:45:11AM -0700, David O'Brien wrote:
> On Mon, Oct 18, 2004 at 08:35:16PM +0300, Ruslan Ermilov wrote:
> > On Mon, Oct 18, 2004 at 05:19:36PM +0000, David E. O'Brien wrote:
> > > obrien      2004-10-18 17:19:36 UTC
> > >   FreeBSD src repository
> > >   Modified files:
> > >     lib/libc/i386/net    htonl.S ntohl.S 
> > >   Log:
> > >   Sync with sys/i386/include/endian.h: use the single instruction 'bswap'.
> > >   Revision  Changes    Path
> > >   1.10      +4 -0      src/lib/libc/i386/net/htonl.S
> > >   1.10      +4 -0      src/lib/libc/i386/net/ntohl.S
> > :  ENTRY(__htonl)
> > :         movl    4(%esp),%eax
> > : +#ifdef I386_CPU
> > :         xchgb   %al,%ah
> > :         roll    $16,%eax
> > :         xchgb   %al,%ah
> > : +#else
> > : +       bswap   %eax
> > : +#endif
> > :         ret
> > 
> > Ahem, but this makes this code unsuitable for i386.
> 
> Yes.  You missed the discussion in freebsd-current on this?  For
> 6-CURRENT and RELENG_5 running on a real I386 is not supported.

I have certainly not seen any message stating that on -current.

I know that the GENERIC kernel does not work on a i386, so that you
need a custom-built kernel to install on a real i386.
I also know that support for FPU-less systems has been dropped, which
means that most 386-based systems (those without an '387) (as well as
systems with a 486sx w/o a 487sx) will not run RELENG_5 or -CURRENT.

Neither of these means that a real 80386+80387 is unsupported, just
that you need to build a new kernel first.


I think you people need to decide to either drop support for 80386
completely (in which case all the '#ifdef I386_CPU' and similar can go
away) or decide to keep support for it, in which case most things
should just work 'out of the box' on a 80386 (without recompilation
needed more than absolutely necessary.)



-- 
<Insert your favourite quote here.>
Erik Trulsson
ertr1013 at student.uu.se