physpfn           220 arch/alpha/include/asm/pgtable.h extern inline pte_t pfn_pte(unsigned long physpfn, pgprot_t pgprot)
physpfn           221 arch/alpha/include/asm/pgtable.h { pte_t pte; pte_val(pte) = (PHYS_TWIDDLE(physpfn) << 32) | pgprot_val(pgprot); return pte; }