CHIP_MEM_SYS_START
abst->abst_sys_start = CHIP_MEM_SYS_START(v);
abst->abst_sys_end = CHIP_MEM_SYS_START(v) + abst->abst_bus_end;
*memhp = ALPHA_PHYS_TO_K0SEG(CHIP_MEM_SYS_START(v)) + memaddr;
memaddr = memh - ALPHA_PHYS_TO_K0SEG(CHIP_MEM_SYS_START(v));
*bshp = ALPHA_PHYS_TO_K0SEG(CHIP_MEM_SYS_START(v)) + memaddr;
return (alpha_btop(CHIP_MEM_SYS_START(v) + addr + off));