sh_bios_call
sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0);
sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0);
sh_bios_call(BIOS_CALL_ETH_NODE_ADDR, 0, (long)node_addr, 0, 0);
sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0);