MEMORY_START
#define ARCH_PFN_OFFSET ((unsigned long)(MEMORY_START >> PAGE_SHIFT))
#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + PAGE_OFFSET - MEMORY_START))
#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START)
if (PHYSICAL_START > MEMORY_START)
memblock_reserve(MEMORY_START, int_vector_size);
if ((PHYSICAL_START > MEMORY_START) &&
min_low_pfn = MEMORY_START >> PAGE_SHIFT;
min_low_pfn = MEMORY_START >> PAGE_SHIFT;