Use the beam position registers, which provide at least 17 bits of data
changing at 1.79 MHz.
Signed-off-by: Geert Uytterhoeven <ge...@linux-m68k.org>
---
v2:
- Use beam position registers (which provide a faster rate but less bits)
instead of 24-bit Time-Of-Day clock in CIA B running at HSYNC.
arch/m68k/amiga/config.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/m68k/amiga/config.c b/arch/m68k/amiga/config.c
index f78361bff623..0b46d32a345f 100644
--- a/arch/m68k/amiga/config.c
+++ b/arch/m68k/amiga/config.c
@@ -354,6 +354,14 @@ 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
*/
@@ -391,6 +399,8 @@ 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 */
--
1.7.9.5
--
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