[mirror_ubuntu-jammy-kernel.git] / arch / powerpc / platforms / pseries / rng.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);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
a489043f ME	2	/*
a489043f ME	3	* Copyright 2013, Michael Ellerman, IBM Corporation.
a489043f ME	4	*/
	5
	6	#define pr_fmt(fmt) "pseries-rng: " fmt
	7
	8	#include <linux/kernel.h>
	9	#include <linux/of.h>
	10	#include <asm/archrandom.h>
	11	#include <asm/machdep.h>
148924f7	12	#include <asm/plpar_wrappers.h>
a489043f ME	13
	14
	15	static int pseries_get_random_long(unsigned long *v)
	16	{
	17	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
	18
	19	if (plpar_hcall(H_RANDOM, retbuf) == H_SUCCESS) {
	20	*v = retbuf[0];
	21	return 1;
	22	}
	23
	24	return 0;
	25	}
	26
	27	static __init int rng_init(void)
	28	{
	29	struct device_node *dn;
	30
	31	dn = of_find_compatible_node(NULL, NULL, "ibm,random");
	32	if (!dn)
	33	return -ENODEV;
	34
	35	pr_info("Registering arch random hook.\n");
	36
01c9348c	37	ppc_md.get_random_seed = pseries_get_random_long;
a489043f ME	38
	39	return 0;
	40	}
8e83e905	41	machine_subsys_initcall(pseries, rng_init);