Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!jarthur!uunet!microsoft!kensy
From: kensy@microsoft.UUCP (Ken SYKES)
Newsgroups: comp.windows.ms
Subject: Re: __ahincr
Keywords: 64k+ data in in-line assembly
Message-ID: <55849@microsoft.UUCP>
Date: 16 Jul 90 18:47:14 GMT
References: <6887@umd5.umd.edu>
Reply-To: kensy@microsoft.UUCP (Ken SYKES)
Distribution: usa
Organization: Microsoft Corp., Redmond WA
Lines: 42

In article <6887@umd5.umd.edu> brianf@umd5.umd.edu (Brian Farmer) writes:
>
>	Has anyone tried to use the predefined variable '__ahincr'.  We
[stuff deleted]
>
>extern int __ahincr;   
>extern int _ahincr;
>
>The first definition gives an undefined external on linking.  The second
>compiles and links correctly but on running has a value of zero.
>
>The code the actually works with the segments is in-line code.
>
>
>Thanks for any help you might be able to offer.
>
>Brian Farmer
>brianf@umd5.umd.edu

_ahincr is an absolute external which means that the value you want 
is actually the address of the variable, not the contents.  What you
should do is the following:

extern int _ahincr;

#define AHINCR &_ahincr

in your code do

seg += AHINCR;

in assembler you would define the symbol as absolute external and everything
would be fine.  For the in-line assembler you may have to do the following:

int ahincr = &_ahincr;

and use ahincr in your in-line assembler (There may be an easier way...)

Hope this helps.

--Ken Sykes
The opinions expressed are mine and don't represent my Employer's.