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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 |
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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
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