Xref: news2.mv.net comp.os.msdos.djgpp:1610
From: wpetiot AT worldnet DOT fr (William Petiot)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: .byte 0x64
Date: Wed, 28 Feb 96 20:27:00 PST
Organization: Magical Wonder Band
Lines: 13
Message-ID: <4hcs8u$1l6@aldebaran.sct.fr>
References: <Pine DOT A32 DOT 3 DOT 91 DOT 960227141833 DOT 9397B-100000 AT genius DOT tisl DOT soft DOT net>
NNTP-Posting-Host: client115.sct.fr
Mime-Version: 1.0
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

In article <Pine DOT A32 DOT 3 DOT 91 DOT 960227141833 DOT 9397B-100000 AT genius DOT tisl DOT soft DOT net>, 
sandy AT genius DOT tisl DOT soft DOT net says...
>
>Hi all,
>
>Could anyone help me out with the code in sys/farptr.h.
>All the functions have a ".byte 0x64" before the move. Why
>is this required ?

0x64 is the opcode for prefix segment mnemonic : "ES:"
farptr uses ES segment register to access memory, Gnu AS doesn't know
the prefix ES: so one must use .byte 0x64 to encode this.