Date: Mon, 14 Aug 1995 23:46:06 -0400 (EDT)
From: Cuthalion / Sliced Bread <enrico AT max DOT tiac DOT net>
To: DJGPP Listserver <djgpp AT sun DOT soe DOT clarkson DOT edu>
Subject: DPMI stuff


	Hi.  I'm trying to write an IRQ handler under DJGPP. (I'm using 
int86(0x31,....), because of skimpy docs on many of the DPMI 
functions..)  But some of the dpmi functions (lock linear region, for 
instance) take linear addresses.  I don't know what a linear addres is!  
What I'm doing to get these addresses is adding &myvar to the selector 
base for _my_cs(), but that ends me up with something absurd for my 
selector base (for _my_cs()) ranging from 0x1000000 to 0xda62bc02 or 
something huge like that depending on which DPMI server I use.  (The 
weird number is with Windows.  I get 0x80003000 under QDPMI.)  It seems 
to me that these values are quite obviously not right (I don't have 2 GIG 
of ram, even WITH Swapping!) and sure enough, the second lock linear 
memory I try to do fails.  (Oddly enough, the first one works..)  
(Fails:  Has regs.x.cflag set on exit.  (Is this a valid way to check 
success?)

	So any ideas as to what I should be doing here?  

	I looked at the info pages for lock linear memory region or 
whatever, and found:

Syntax:
-------

#include <dpmi.h>

int __dpmi_lock_linear_region

Description:
------------
<EXTREMELY terse description> (The DPMI spec's not too much better here..)

	The thing is it doesn't say what parameters it needs.  I can only 
assume that it will need parentheses to compile; there are no mention of 
them in the online help!

/***************************************************************
*** Jesse Morris *** enrico AT max DOT tiac DOT net *** jmorris AT ace DOT com ***
***************** Cuthalion / Sliced Bread  *******************/