diff options
| author |   Geert Uytterhoeven <geert@linux-m68k.org> | 2013-10-18 13:16:06 +0200 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2013-11-26 11:09:25 +0100 |
| commit | 50190edb2a56bb9efa3e2f8ca32482dbd3e42412 (patch) | |
| tree | a5d181e2ff31b23c1af38e1f85982ba6b86fec11 /arch/m68k | |
| parent | m68k: Add infrastructure for machine-specific random_get_entropy() (diff) | |
| download | linux-dev-50190edb2a56bb9efa3e2f8ca32482dbd3e42412.tar.xz linux-dev-50190edb2a56bb9efa3e2f8ca32482dbd3e42412.zip | |
m68k/amiga: Provide mach_random_get_entropy()
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>
Diffstat (limited to 'arch/m68k')
| -rw-r--r-- | arch/m68k/amiga/config.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/m68k/amiga/config.c b/arch/m68k/amiga/config.c index 06920e85fac9..c425fa6c2795 100644 --- a/arch/m68k/amiga/config.c +++ b/arch/m68k/amiga/config.c @@ -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 */ |