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
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To: djgpp AT delorie DOT com
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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