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Re: modernizing npx(4)
On Wed, Jan 09, 2008 at 06:54:50PM -0600, David Young wrote:
> It is my understanding that since we do not support the 80386 any more,
> there is no need to support npx at irq 13, since every x86 processor
> since the 80486 is capable of reporting FP errors by using exception 16.
> Is it ok if I get rid of the vestiges of irq 13 handling,
Sounds good to me. It could share amd64's fpu.c. The only isuse I can think
of is that fpu.c assumes presence of the fxsave/fxrstor instructions (SSE).
> and move npx0 from isa0 to mainbus0? Let me know.
The cpu attachment covers it. As the exception handling suggests the FPU has
not been seperate since the 486 - the 487 was IIRC actually just a 486DX.
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