From:	"stefan fröberg" <traveler AT netti DOT fi>
Newsgroups:	comp.os.msdos.djgpp
Subject:	EXTREMENLY IMPORTANT (To me...)
Date:	Thu, 11 Nov 1999 20:07:34 +0200
Organization:	SAUNALAHDEN SERVERIN asiakas
Lines:	30
Message-ID:	<80f0bb$q68$1@tron.sci.fi>
NNTP-Posting-Host:	mmcc.hdyn.saunalahti.fi
X-Newsreader:	Microsoft Outlook Express 4.72.3110.5
X-MimeOLE:	Produced By Microsoft MimeOLE V4.72.3110.3
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Greetings to everyone !

The following questions are maybe too trivial to some of you but for me they
are unclear:

-    Is there no other way to call DOS/BIOS interrupt that requires a
pointer to buffer,
    than using the "__tb" macro or allocating dos memory as explained by the
    FAQ 18.2 ?
-    I know that the GCC uses the "Flat" memory mode but it's unclear to me
    which segments/selectors it uses by default. I presume that the GCC uses
    "CS" segment/selector for the code and "DS" segment/selector for the
data but
   what about the "ES","FS" and "GS" segment/selectors ? Are they undefined
?
   Can I use them freely in my assembly subroutines and if so, do I have to
save
   them at the start and restore them at the end of the routine ?

-    Are there any important rules and guidelines for using
segments/selectors in      protected mode programming to prevent exceptions
as "General Protection Fault" and other such things to happend ?

Thanks in advance !
traveler AT netti DOT fi

- Raw text -