From:	"David Lee" <keeyu AT poetic DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Real mode interrupt
Date:	Sun, 16 Jul 2000 18:33:19 +0800
Organization:	IMS Netvigator
Lines:	30
Message-ID:	<8ks319$ip3178@imsp212.netvigator.com>
NNTP-Posting-Host:	wtsak016175.netvigator.com
X-Priority:	3
X-MSMail-Priority:	Normal
X-Newsreader:	Microsoft Outlook Express 5.00.2615.200
X-MimeOLE:	Produced By Microsoft MimeOLE V5.00.2615.200
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

I would like to call DOS interrupt 25h from my djgpp program. This function
explicitly requires the caller to pop off the flags after the interrupt
returns:

    int 25h
    jc err_handler

    popf            ; pop off the flag (from the stack) after the interrupt.

For protected mode programs, 'popf' would mean 'popping off from real mode
stack.' Now it seems 'popf' becomes unnecessary and meaningless, because it
seems that the real mode stack is reinitialized anyway for each __dpmi_int()
call, or is it?

Thanks a lot.

- Raw text -