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From:	ahenric AT ccii DOT co DOT za (Arne)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Hardware interrupt stack and task switching
Date:	3 Oct 2003 02:38:02 -0700
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To:	djgpp AT delorie DOT com
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Hi,

I am trying to get uC/OS-II (the real-time kernel) to work under DOS.
I can do task level switching, but it seems like one cannot do task
switching from a hardware interrupt routine. What I have noticed is
that the stack pointer in the ISR is not the same as that from the
interrupted task. Now what I have read is that DOS sometimes allocates
stacks for HW ISRs, but that one can disable this with the STACKS=0,0
statement in config.sys. This unfortunately does not change anything
for me. So my question: is the DPMI host allocating stacks for each HW
ISR? If that is so, how can I do task switching from the ISR? Is it at
all possible?

I have hooked up my hardware interrupt with the function
_go32_dpmi_set_protected_mode_interrupt_vector(). Is there a better
way?

Thanks
Arne

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