On Mon, 2015-11-23 at 11:58 +1100, Cyril Bur wrote: > On Mon, 23 Nov 2015 11:23:13 +1100 > Michael Neuling <mi...@neuling.org> wrote: > > > On Wed, 2015-11-18 at 14:26 +1100, Cyril Bur wrote: > > > Test that the non volatile floating point and Altivec registers > > > get > > > correctly preserved across the fork() syscall. > > > > Can we add a test for VSX too? I realise it's the same registers, > > but > > the enable bits in the MSR are different so it's easy to get them > > wrong > > in the kernel. > > Yeah, I'm sure I could get that wrong haha. > > Hmmmm this got me thinking. Today we always enable FP and Altivec > when we > enable VSX but isn't there a world where we could actually run with > FP and > Altivec disabled and VSX on? In which case, is the whole thing > volatile or > does the kernel still need to save the subset of the matrix which > corresponds > to non-volatile FPs and non-volatile Altivec?
The hardware can run with FP and VMX off and VSX on but we should never do that in Linux. Mikey _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
