+int64_t opal_return_cpu(void);
+
+int64_t opal_xscom_read(uint32_t gcid, uint32_t pcb_addr, uint64_t *val);
+int64_t opal_xscom_write(uint32_t gcid, uint32_t pcb_addr, uint64_t val);
+
+int64_t opal_lpc_write(uint32_t chip_id, enum OpalLPCAddressType addr_type,
+ uint32_t addr, uint32_t data, uint32_t sz);
+int64_t opal_lpc_read(uint32_t chip_id, enum OpalLPCAddressType addr_type,
+ uint32_t addr, uint32_t *data, uint32_t sz);