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authorGeert Uytterhoeven <geert@linux-m68k.org>2013-10-18 13:10:08 +0200
committerGeert Uytterhoeven <geert@linux-m68k.org>2013-11-26 11:09:24 +0100
commit017cecee99d897ae426f3948e7b970eb4f95e1f4 (patch)
tree449551864d0ded68749b52dc6b60142c9666d187
parent7a15dd5c4b9d916cb1734dfd79dbdd5773772abb (diff)
m68k: Add infrastructure for machine-specific random_get_entropy()
On m68k, get_cycles() (the default implementation for random_get_entropy()) always returns zero, providing no entropy for the random driver. Add a hook where platforms can provide their own implementation, and wire it up in the infrastructure provided by commit 61875f30daf60305712e25b209ef41ced2635bad ("random: allow architectures to optionally define random_get_entropy()"). Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
-rw-r--r--arch/m68k/include/asm/timex.h10
-rw-r--r--arch/m68k/kernel/time.c4
2 files changed, 14 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/timex.h b/arch/m68k/include/asm/timex.h
index 6759dad954f..efc1f489235 100644
--- a/arch/m68k/include/asm/timex.h
+++ b/arch/m68k/include/asm/timex.h
@@ -28,4 +28,14 @@ static inline cycles_t get_cycles(void)
return 0;
}
+extern unsigned long (*mach_random_get_entropy)(void);
+
+static inline unsigned long random_get_entropy(void)
+{
+ if (mach_random_get_entropy)
+ return mach_random_get_entropy();
+ return 0;
+}
+#define random_get_entropy random_get_entropy
+
#endif
diff --git a/arch/m68k/kernel/time.c b/arch/m68k/kernel/time.c
index 7eb9792009f..958f1adb9d0 100644
--- a/arch/m68k/kernel/time.c
+++ b/arch/m68k/kernel/time.c
@@ -28,6 +28,10 @@
#include <linux/timex.h>
#include <linux/profile.h>
+
+unsigned long (*mach_random_get_entropy)(void);
+
+
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "xtime_update()" routine every clocktick