init_memory_mapping
unsigned long init_memory_mapping(unsigned long start,
init_memory_mapping(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT,
init_memory_mapping(start, end, PAGE_KERNEL);
init_memory_mapping(0, ISA_END_ADDRESS, PAGE_KERNEL);
init_memory_mapping(start, start + size, params->pgprot);