CHIP_S_MEM_W2_SYS_START
(ALPHA_PHYS_TO_K0SEG(CHIP_S_MEM_W2_SYS_START(v)) >> 5) +
if ((memh << 5) >= CHIP_S_MEM_W2_SYS_START(v) &&
(memh - (CHIP_S_MEM_W2_SYS_START(v) >> 5));