> Afaik, on i386 you have ~4k of kernel stack, however you have to
> realize that driver entry can come from an interrupt generated when
> the stack is already nearly exhausted. I'm not really that much
> of a driver programmer, but I've heard of people facing this problem
> before, solutions varied, but since each driver instance is single
> threaded you can pre-allocate via malloc (i think) the space you
> need and attach it to the per-driver data structure (softc afaik).
i am confused between the kernel stack in kernel space (where ISRs
are called) and kernel stack each process has. the UPAGES constant
defines the size of process kernel stack. does it define kernel stack in
kernel space also?? (fig 3.1, page 51, BSD book)
BTW, memory for softc is allocated from the heap in newbus
architecture.
--
mohan
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