From: Dave Jones <davej@codemonkey.org.uk>
To: S-n-e-a-k-e-r@gmx.net
Cc: linux-kernel@vger.kernel.org
Subject: Re: int 0x15, ah=0x88 question
Date: Mon, 19 May 2003 14:08:20 +0100 [thread overview]
Message-ID: <20030519130820.GA30320@suse.de> (raw)
In-Reply-To: <9188.1053339727@www54.gmx.net>
On Mon, May 19, 2003 at 12:22:07PM +0200, S-n-e-a-k-e-r@gmx.net wrote:
>
> 387 movb $0x88, %ah
> 388 int $0x15
> 389 movw %ax, (2)
>
> Why memory address 2 is used? Where else in the kernel is it used? We are in
> real mode, so (2) should be the same as %ds:(2), or not?
This code is building the entries in the zero page for use later.
> Sorry that I'm bugging the mailing list with that question but I didn't
> found the answer anywhere. So a web page, a book or something else would be also
> nice as an answer.
See Documentation/i386/zero-page.txt
Dave
prev parent reply other threads:[~2003-05-19 12:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-19 10:22 int 0x15, ah=0x88 question S-n-e-a-k-e-r
2003-05-19 13:08 ` Dave Jones [this message]
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