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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
42 lines
784 B
C
42 lines
784 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2013, Michael Ellerman, IBM Corporation.
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*/
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#define pr_fmt(fmt) "pseries-rng: " fmt
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <asm/archrandom.h>
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#include <asm/machdep.h>
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#include <asm/plpar_wrappers.h>
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static int pseries_get_random_long(unsigned long *v)
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{
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
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if (plpar_hcall(H_RANDOM, retbuf) == H_SUCCESS) {
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*v = retbuf[0];
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return 1;
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}
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return 0;
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}
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static __init int rng_init(void)
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{
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struct device_node *dn;
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dn = of_find_compatible_node(NULL, NULL, "ibm,random");
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if (!dn)
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return -ENODEV;
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pr_info("Registering arch random hook.\n");
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ppc_md.get_random_seed = pseries_get_random_long;
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return 0;
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}
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machine_subsys_initcall(pseries, rng_init);
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