Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit a489043f authored by Michael Ellerman's avatar Michael Ellerman Committed by Benjamin Herrenschmidt
Browse files

powerpc/pseries: Implement arch_get_random_long() based on H_RANDOM 



Add support for the arch_get_random_long() hook based on the H_RANDOM
hypervisor call. We trust the hypervisor to provide us with random data,
ie. we don't whiten it in anyway.

Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 66548e40

arch/powerpc/platforms/pseries/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -3,7 +3,7 @@ ccflags-$(CONFIG_PPC_PSERIES_DEBUG) += -DDEBUG 


obj-y			:= lpar.o hvCall.o nvram.o reconfig.o \

			   setup.o iommu.o event_sources.o ras.o \

			   firmware.o power.o dlpar.o mobility.o

			   firmware.o power.o dlpar.o mobility.o rng.o

obj-$(CONFIG_SMP)	+= smp.o

obj-$(CONFIG_SCANLOG)	+= scanlog.o

obj-$(CONFIG_EEH)	+= eeh_pseries.o

arch/powerpc/platforms/pseries/rng.c

0 → 100644
+44 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2013, Michael Ellerman, IBM Corporation.

 *

 * 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.

 */



#define pr_fmt(fmt)	"pseries-rng: " fmt



#include <linux/kernel.h>

#include <linux/of.h>

#include <asm/archrandom.h>

#include <asm/machdep.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_long = pseries_get_random_long;



	return 0;

}

subsys_initcall(rng_init);