cache_loop
cache_loop(paddr, end, reg, cache_type);
cache_loop(start, end, SPR_DCBFR, SPR_UPR_DCP);
cache_loop(start, end, SPR_DCBIR, SPR_UPR_DCP);
cache_loop(start, end, SPR_ICBIR, SPR_UPR_ICP);