| /* | |
| * Copyright 2013, Michael Ellerman, IBM Corporation. | |
| * | |
| * This program is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU General Public License | |
| * as published by the Free Software Foundation; either version | |
| * 2 of the License, or (at your option) any later version. | |
| */ | |
| #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); |