* Mohana Krishna Penumetcha <[EMAIL PROTECTED]> [010111 03:08] wrote:
>
>
> > 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.
I'm pretty sure interrupts are piggybacked on the user-kernel-stack.
How about trying the simple printf idea and letting us know if that
works?
--
-Alfred Perlstein - [[EMAIL PROTECTED]|[EMAIL PROTECTED]]
"I have the heart of a child; I keep it in a jar on my desk."
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-hackers" in the body of the message
