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m68k/amiga: Provide mach_random_get_entropy()

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Use the beam position registers, which provide at least 17 bits of data
changing at 1.79 MHz.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Geert Uytterhoeven 2013-10-18 13:16:06 +02:00
parent 017cecee99
commit 50190edb2a
1 changed files with 10 additions and 0 deletions
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arch/m68k/amiga/config.c
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@ -360,6 +360,14 @@ static void __init amiga_identify(void)
#undef AMIGAHW_ANNOUNCE
}
static unsigned long amiga_random_get_entropy(void)
{
/* VPOSR/VHPOSR provide at least 17 bits of data changing at 1.79 MHz */
return *(unsigned long *)&amiga_custom.vposr;
}
/*
* Setup the Amiga configuration info
*/
@ -397,6 +405,8 @@ void __init config_amiga(void)
mach_heartbeat = amiga_heartbeat;
#endif
mach_random_get_entropy = amiga_random_get_entropy;
/* Fill in the clock value (based on the 700 kHz E-Clock) */
amiga_colorclock = 5*amiga_eclock; /* 3.5 MHz */