cvs commit: src/sys/i386/isa npx.c
bde at zeta.org.au
Mon May 29 07:09:27 PDT 2006
On Mon, 29 May 2006, David Xu wrote:
> On Sunday 28 May 2006 21:58, Bruce Evans wrote:
>> OK if it is correct to not copy the environment.
> I will revert changes, I think I should keep it safe as before.
I couldn't find any more details about this using google.
>> ... old CPUs (at least amd64 ones) that don't support mxcsr_mask
>> also don't support DAZ, so the correct mask for them is 0xFFBF. These
>> complications are implemented in Linux's i386 so I suppose they are
>> no-ops at worst for non-amd64 CPUs. Linux stores the mask in a global
>> variable. I think this breaks the asymmetric SMP case more than
> process migrates from one CPU to another, I don't think you can use such
> CPUs in same system if they are different in this case.
Only actually using DAZ is sure not to work.
> I haven't tried DAZ bit, will you fix it ?
No, not in -current, sorry. I'll check your fix for it.
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