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Re: standard runtime for (possible/hopeful) 64bit kernels
makes more sense to build the kernel as N32 rather than N64... or
possibly N32 with 64-bit paddr_t.
In some reliefing side of "64bit" kernel, post-R4000 needs 32bit
PTE to absorb 36/40 paddr space since PFN field in TLBlo is
designed shifted toward LSB to make possible sizeof(pte_t) == 4.
C.f., 36bit extension in other CPU architectures.
Down side of the design was/is X bit brings larger address
space _and_ 64bit ld/sd instruction availablity.
Toru Nishimura / ALKYL Technology
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