blob: 6ddfdeaace9ef63241da84192edb65f2eb1a02cc (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
// 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>
#include "pseries.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;
}
void __init pseries_rng_init(void)
{
struct device_node *dn;
dn = of_find_compatible_node(NULL, NULL, "ibm,random");
if (!dn)
return;
ppc_md.get_random_seed = pseries_get_random_long;
of_node_put(dn);
}
|
