5c7dd7acc3
repo: https://github.com/T-head-Semi/linux commit: b1313fe517ca3703119dcc99ef3bbf75ab42bcfb Change-Id: I6cbb35294024ea3a66140e311f4bb705fd7fd626
43 lines
802 B
C
43 lines
802 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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of_node_put(dn);
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return 0;
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}
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machine_subsys_initcall(pseries, rng_init);
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