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From: Simon Wright <simon@pushface.org>
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Subject: Re: silly ravenscar question
Date: Sat, 28 Feb 2015 20:23:18 +0000
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jan.de.kruyf@gmail.com writes:

> 32 bits? that wont do. for time synching you need 64 bits. . . 

Yes, I suppose so, but I've not yet needed to convert Duration to
Time_Span or vice versa .. will post bug report to myself.

> Where exactly does the system drop from supervisor mode into user mode?
> and also where is the silly routine to go back into supervisor mode?

I think it's in s-bbcppr.adb, Pend_SV_Handler.

I may well be wrong, but doesn't the Cortex switch to supervisor mode
automatically when an interrupt occurs?