Hi, On Mon, 21 May 2007, Brad Boyer wrote:
> I'd like to avoid following in the footsteps of the i386 style support > particularly because it does require more extensive kernel support than > most of the other architectures. I'm still looking over the documentation > and the implementation details of the other architectures, but I'll put > something together as a proposal before I write any code. I think there are two possible approaches. As you know we need per thread data. This can either be in a register, which would be the fastest option, but our current ABI doesn't define one, so it basically means an ABI change to reserve a register for it so it doesn't get clobbered. The other possibility is to use a memory location, this requires kernel support to update the memory pointer at every task switch (we don't have SMP, so it's a lot easier), but it has the advantage that it's otherwise backwards compatible. IMO the simpler option in the short term is via a memory pointer, an ABI change needs a lot more preparation (although it's desirable in the long term to also fix other things). bye, Roman -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
