Messages in this thread | | | Date | Wed, 9 Aug 2006 10:02:53 +0000 (GMT) | From | moreau francis <> | Subject | Re : [HW_RNG] How to use generic rng in kernel space |
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Michael Buesch wrote: > On Tuesday 08 August 2006 17:39, moreau francis wrote: >> Michael Buesch wrote: >>> So, if you have a special hwrng on your embedded board and you >>> have some special driver in that board, why not interface >>> directly from the driver to the hwrng-driver? >> This is what I'm currently doing. I was just thinking to use the >> new HW-RNG layer and drop common code... >> >>> This is all pretty special case. >>> In the hwrng-driver you could still additionally do a >>> hrwng_register() to export the functionality to >>> userspace, though. >>> >> yes I would like to do that but there is a problem: I have no >> access to "rng_mutex" to synchronise hw accesses and I'm >> wondering if there's any issue to use a mutex in driver init >> code. > > Use your own mutex or spinlock in the data_read callback > and use that to serialize accesses to the hardware. >
I think I miss something there but I need to lock this whole sequence when reading a random data:
lock(hwrng); rng_data_present(); rng_data_read(); unlock(hwrng);
not only data_read callback. To do that I can only use "rng_mutex", no ?
thanks
Francis
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