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Re: APM information in the Multiboot specification

From: Yoshinori K. Okuji
Subject: Re: APM information in the Multiboot specification
Date: Wed, 18 Sep 2002 07:55:10 +0900
User-agent: Wanderlust/2.8.1 (Something) SEMI/1.14.3 (Ushinoya) FLIM/1.14.3 (Unebigoryƍmae) APEL/10.3 Emacs/21.2 (i386-debian-linux-gnu) MULE/5.0 (SAKAKI)

At Tue, 17 Sep 2002 22:51:59 +0200,
Viktor Pracht wrote:
> Can somebody explain to me what's the point of including APM information in
> the Multiboot information structure? To use APM, the OS must switch to
> Real/Virtual 8086 mode and call int 15h, at which point it gets the APM
> information in registers anyway.

No. APM has protected mode interface, although it was not a requirement
until version 1.2. When your APM BIOS supports the protected mode
interface, only the initialization must be done in real mode, so a
Multiboot-compliant boot loader should assist it.


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