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Re: multiboot information structure flags are confusing me


From: Christoph Plattner
Subject: Re: multiboot information structure flags are confusing me
Date: Thu, 14 Feb 2002 08:46:37 +0100

Hello,

I often hear from it on this mailing list, but I have not got
the background.

What is VBE in GRUB ?
Can anybody give me about 5 sentences ?

Bye
Christoph P.


Timmy Douglas wrote:
> 
> Alex Thiel <address@hidden> said:
> >On Tuesday 12 February 2002 04:02, Timmy Douglas wrote:
> >> i want to enable some flags for the multiboot information
> >> structure. so i can get some VBE info.
> >>
> >> however, the docs talk about two separate groups of flags: the ones in
> >> the binary header and the multiboot info flags. it says that the
> >> multiboot info pointer is passed in %ebx (or whatever) to the main
> >> function, but how can i set the flags so grub can put what i want in
> >> the structure?
> >>
> >
> >There are indeed two sets of flags: the OS requests features via the header
> >in the OS image (see chapter OS image format in the multiboot documentation),
> >and GRUB passes information about the actual state of the system in the
> >multiboot info structure.
> 
> ok thanks
> 
> >For example, the OS requests VBE information via bit 2 of the flags field in
> >the OS header. Suppose the BIOS did not support VBE, then GRUB would set the
> >corresponding flag in the multiboot info structure to zero and leave it to
> >the application to handle the situation.
> 
> and one thing about your docs:
> 
>              +-------------------+
>      0       | vbe_control_info  |
>      4       | vbe_mode_info     |
>      8       | vbe_mode          |
>      10      | vbe_interface_seg |
>      12      | vbe_interface_off |
>      14      | vbe_interface_len |
>              +-------------------+
> 
> i assume that vbe_interface_len is 2 bytes?
> 
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