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powerpc: Implement arch_get_random_long/int() for powernv

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Add the plumbing to implement arch_get_random_long/int(). It didn't seem
worth adding an extra ppc_md hook for int, so we reuse the one for long.

Add an implementation for powernv based on the hwrng found in power7+
systems. We whiten the output of the hwrng, and the result passes all
the dieharder tests.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2013-10-11 14:07:57 +11:00 • committed by Benjamin Herrenschmidt
parent f95dabef4c
commit a4da0d50b2
6 changed files with 163 additions and 1 deletions
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32
arch/powerpc/include/asm/archrandom.h Normal file
View file

@ -0,0 +1,32 @@
#ifndef _ASM_POWERPC_ARCHRANDOM_H
#define _ASM_POWERPC_ARCHRANDOM_H
#ifdef CONFIG_ARCH_RANDOM
#include <asm/machdep.h>
static inline int arch_get_random_long(unsigned long *v)
{
if (ppc_md.get_random_long)
return ppc_md.get_random_long(v);
return 0;
}
static inline int arch_get_random_int(unsigned int *v)
{
unsigned long val;
int rc;
rc = arch_get_random_long(&val);
if (rc)
*v = val;
return rc;
}
int powernv_get_random_long(unsigned long *v);
#endif /* CONFIG_ARCH_RANDOM */
#endif /* _ASM_POWERPC_ARCHRANDOM_H */