Re: SSE2

[Robert Swindells <rjs%fdy2.demon.co.uk@localhost>]

Following up to my own message:
>Should using SSE2 work on Xen now ? There is an email thread from several
>years ago that said that it didn't.
>
>I'm running an i386 NetBSD 5 DOMU on top of an amd64 NetBSD-current DOM0.
>
>On the DOMU I get:
>
>machdep.fpu_present = 1
>machdep.osfxsr = 0
>machdep.sse = 0
>machdep.sse2 = 0
>machdep.cpu_brand = Intel(R) Atom(TM) CPU  230   @ 1.60GHz

Why is the CPUID_FXSR bit removed from the kernel's copy of the
features word when building for XEN ?

There is code to do this in :

sys/arch/i386/i386/machdep.c
sys/arch/amd64/amd64/machdep.c
sys/arch/xen/x86/cpu.c

Robert Swindells