// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright 2013, Michael Ellerman, IBM Corporation. */ #define pr_fmt(fmt) "pseries-rng: " fmt #include <linux/kernel.h> #include <linux/of.h> #include <asm/archrandom.h> #include <asm/machdep.h> #include <asm/plpar_wrappers.h> static int pseries_get_random_long(unsigned long *v) { unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; if (plpar_hcall(H_RANDOM, retbuf) == H_SUCCESS) { *v = retbuf[0]; return 1; } return 0; } static __init int rng_init(void) { struct device_node *dn; dn = of_find_compatible_node(NULL, NULL, "ibm,random"); if (!dn) return -ENODEV; pr_info("Registering arch random hook.\n"); ppc_md.get_random_seed = pseries_get_random_long; return 0; } machine_subsys_initcall(pseries, rng_init);