42 lines
784 B
C
42 lines
784 B
C
// 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);
|