From:	boylesgj AT lion DOT cs DOT latrobe DOT edu DOT au (Gregary J Boyles)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Real mode ISR's
Date:	13 Apr 1997 15:24:30 GMT
Organization:	Comp.Sci & Comp.Eng, La Trobe Uni, Australia
Lines:	9
Distribution:	world
Message-ID:	<5iqtre$jt7@lion.cs.latrobe.edu.au>
NNTP-Posting-Host:	lion.cs.latrobe.edu.au
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Which are the steps which need to be taken on entering and leaving an ISR?
I can't find any info which will tell me and I am used to using the
Borland key word 'interrupt'.

When using _go32_dpmi_allocate_dos_memory(...) I was going to enclose the
ISR function and variables it uses inside two dummy functions and do
pointer arithmetic to determine the size of the memory required. Is there
any way of ensuring that gcc won't rearrange the variables or functions?

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