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From:	Rugxulo <rugxulo AT gmail DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: gprof output
Date:	Mon, 28 May 2012 15:01:26 -0700 (PDT)
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Hi,

On May 28, 3:50 pm, Eli Zaretskii <e DOT  DOT  DOT  AT gnu DOT org> wrote:
> > From: Georg <dos DOT  DOT  DOT  AT googlemail DOT com>
> > Date: Mon, 28 May 2012 13:37:54 -0700 (PDT)
>
> > I now removed my _dpmi_int calls from my program but still 80-90% of
> > the processing time is done for _dpmi_int. Does djgpp call this
> > internally?
>
> Yes.

It shouldn't be "slow" just because it uses __dpmi_int. Don't worry
about it unless you're sure that something isn't nearly fast enough.
(I'm not sure what you're trying to do here.)

> > I use int86() to query the mouse and getch() plus bioskey() to query
> > the keyboard. Could these functions cause this?
>
> Of course!  Any real-mode interrupt call goes through __dpmi_int,
> because that's the _only_ way to invoke real-mode DOS/BIOS services
> from protected mode.

Couldn't he bypass DOS and go directly to keyboard himself? (naive)
Would that speed things up, or do you run into a billion problems like
EMM386 and IOPL or whatever-the-heck?

http://wiki.osdev.org/Interrupts

> push eax    ;; make sure you don't damage current state
> in al,60h   ;; read information from the keyboard
>
> mov al,20h
> out 20h,al  ;; acknowledge the interrupt to the PIC
> pop eax     ;; restore state
> iret        ;; return to code executed before.

Hmmm, I vaguely remember the UPX dude writing his own keyboard
library, and (IIRC) it works with DJGPP.

http://www.ibiblio.org/pub/Linux/libs/ui/libkb-1.01.tar.gz

P.S. Just as I thought (doh), DJGPP's mirror, /current/ only, has
older 1.00:

ftp://ftp.delorie.com/pub/djgpp/current/v2tk/libkb100.zip

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