Date: Mon, 24 Apr 2000 16:51:29 -0400 From: James FitzGibbon <james@targetnet.com> To: current@freebsd.org Subject: rndcontrol with > 16 interrupts Message-ID: <20000424165128.G8994@targetnet.com>
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Are there any plans to allow rndcontrol to accept greater than 16 interrupts
on SMP machines ? On my ASUS XG-DLS board, all the interesting interrupts
that I want to use to stir the entropy pool are greater than 16.
Examination of sys/i386/i386/mem.c on RELENG_3, RELENG_4 and HEAD all have
this comment and code snippet:
/*
* XXX the data is 16-bit due to a historical botch, so we use
* magic 16's instead of ICU_LEN and can't support 24 interrupts
* under SMP.
*/
intr = *(int16_t *)data;
if (cmd != MEM_RETURNIRQ && (intr < 0 || intr >= 16))
return (EINVAL);
I don't exactly understand what ICU_LEN refers to or if there are technical
reasons that we can't support 24 interrupts, but the present situation
leaves me with a powerful machine that can't take advantage of /dev/random
at all (the pool has so little to feed off of that reads of even small
amounts of data block).
Can anyone shed some light ?
TIA.
--
j.
James FitzGibbon james@targetnet.com
Targetnet.com Inc. Voice/Fax +1 416 306-0466/0452
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