On Fri, Oct 02, 2015 at 09:24:46PM -0500, Peter Bergner wrote: > > > Ok, than we can just zero out r5 for example and use it in tlbie as RS, > > > right? > > > > That won't assemble _unless_ your assembler is in POWER7 mode. It also > > won't do the right thing at run time on older machines. > > Correct, getting this to work on both pre-power7 and power7 and later > is tricky. One really horrible hack would be to do: > > li r0,0 > tlbie r4,0 > > On pre-power7, the "0" will be taken as a zero L operand and on > power7 and later, it'll be r0, but with a zero value we loaded in > the insn before. I know, really ugly. :-)
Hide the "li 0,0" somewhere earlier, and write it as "tlbie 4,0", and don't write a comment -- we *like* tricky! It should really be a separate macro define for power7 and 4xx etc.; and the macro should not be called "tlbia", but something that makes it obvious at the usage sites that it is in fact a macro; and why a macro anyway, a function call might be better here? Segher -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
