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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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- multiboot information structure flags are confusing me, Timmy Douglas, 2002/02/11
- Re: multiboot information structure flags are confusing me, Alex Thiel, 2002/02/14
- Re: multiboot information structure flags are confusing me, Timmy Douglas, 2002/02/16
- Re: multiboot information structure flags are confusing me, Alex Thiel, 2002/02/16
- Re: multiboot information structure flags are confusing me, Timmy Douglas, 2002/02/16