Is setjmp/longjmp allowed in kernel code? Is it even implemented?

The reason I ask is that the only working Mac pseudo DMA implementation I 
have found uses it (in NetBSD/FreeBSD, sys/arch/mac68k/obio/esp.c) to 
longjmp from the bus error handler back to the driver. My driver doesn't 
use that algorithm and doesn't work :-(

Anyone have any suggestions?

Finn
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