DART_PAGE_MASK
#define DART_L2_START(addr) ((((addr) & DART_PAGE_MASK) >> 2) << 52)
#define DART_L2_END(addr) ((((addr) & DART_PAGE_MASK) >> 2) << 40)
return ((pa + DART_PAGE_MASK) & ~DART_PAGE_MASK);
return (pa & ~DART_PAGE_MASK);
end = DART_PAGE_MASK;