MIPS3_WIRED_OFFMASK
off = pa & MIPS3_WIRED_OFFMASK;
pa &= ~(paddr_t)MIPS3_WIRED_OFFMASK;
fb_off = fb_paddr & MIPS3_WIRED_OFFMASK;
reg_off = reg_paddr & MIPS3_WIRED_OFFMASK;
fb_paddr = fb_paddr & ~MIPS3_WIRED_OFFMASK;
reg_paddr = reg_paddr & ~MIPS3_WIRED_OFFMASK;
KASSERT((va & MIPS3_WIRED_OFFMASK) == (pa & MIPS3_WIRED_OFFMASK));
va &= ~MIPS3_WIRED_OFFMASK;
pa &= ~MIPS3_WIRED_OFFMASK;