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I need to add zero-page to support XIP. Unallocated blocks are redirected
to this. Basically it's a static simgle page filled with zero.
and initialized by pmap.c like:
pmap_zeropage = (void *)uvm_pageboot_alloc(PAGE_SIZE);
pmap_zeropage_phys_addr = MIPS_KSEG0_TO_PHYS(pmap_zeropage);
Because it's used publically (from the coming custome genfs_getpages()), it's
defined somewhere like uvm_page.h.
Masao Uebayashi / Tombi Inc. / Tel: +81-90-9141-4635
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