> Correct. If HAS_IOPORT is not selected then we are potentially missing
> the dependent functions (because the platform has no IOPORT support) _or_
> it does have ISA/PCI IO spaces _but_ they're not mappable via the
> ioport_map() mechanism due to some non-linearity involved in the
> translation.
>
> To make that second point clear, that's platforms where:
>
> ioport_map(addr + 4) != ioport_map(addr) + 4.
For inb/inw and friends this shouldn't matter.
You can implement inl for example
as
if (unlikely(addr & 3))
// or in fact BUG on this for almost all h/w
uninlined_hard_slow_inl(addr);
else
return *(u32 *)iospace_map[addr];
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