From:	aho450s AT nic DOT smsu DOT edu (Tony O'Bryan)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Help passing pointers to intdosx.
Date:	Sat, 08 Feb 1997 20:35:44 GMT
Organization:	Southwest Missouri State University
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Message-ID:	<32fce1d9.2300822@ursa.smsu.edu>
References:	<32FB1913 DOT 457B AT compuserve DOT com>
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To:	djgpp AT delorie DOT com
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On Fri, 07 Feb 1997 11:59:15 +0000, JuneSmith <106363 DOT 3644 AT compuserve DOT com>
wrote:

[snip]

>	pregs.h.ah = 0x09;
>	sregs.ds. = FP_SEG ( Message );		/* Get the var. */
>	pregs.x.dx = FP_OFF ( Message );	/* addresses	*/

In FAQ section 18.2 (the same section you quoted), look at the description of
_dpmi_int() and the transfer buffer __tb (two underscores).  Whenever you have a
pointer to memory for a DOS interrupt, it must be in conventional memory (under
1 megabyte).  __tb works great for this purpose.  If you must pass data to the
interrupt, copy the info to the buffer pointer to by __tb and call the interrupt
with _dpmi_int().  Once the interrupt is done, copy the contents pointed to by
__tb to your program's memory and continue on your way.

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