[PATCH] Support for 64-bit PTEs on n64

[Jayachandran C.]

Here's my initial code to support >4GB physical memory on MIPS.  This
patch adds 64 bit page table entries in n64 compilation.

I would like to add this as an optional feature for n32/o32
compilation with 'option PHYSADDR_64_BIT' later.

Comments welcome, I will check this in some time later this week if
all goes well.

JC.
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