Re: Transfering Data from GRUB to userspace?

[Tottenham, Max]

Original mail seems to have been eaten again, apologies if you already received 
this. 

On 11/15, Daniel Kiper wrote:
> On Thu, Nov 14, 2019 at 10:27:10AM +0000, Max Tottenham via Grub-devel wrote:
> > On 10/28, Daniel Kiper wrote:
> > > Hi Max,
> >
> > ...
> > I suppose for adding support to [3] the idea would be to define a new
> > generic boot information structure.
> >
> > Maybe something like:
> >
> > Generic 64bit data blob:
> >     +----------------------------------------------------+
> > u32 | type = 22                                          |
> > u32 | size = 28                                          |
> > u64 | data_load_addr = <paddr of loaded data>            |
> > u64 | data_len = <length of loaded data>                 |
> > u32 | data_type = <Some ENUM>                            |
> 
> Why do you need data_type?
> 
> >     +----------------------------------------------------+

My initial thought was that it would be an easy way to create a
'generic' boot info struct where 'type' defines that it's a generic
type, and 'data_type' is a separate type field that is interpreted by
defined by the loaded OS, I suppose the alternative would be to declare
separate boot info struct's for each purpose (so for my purpose a simple
'log' type struct would suffice).

> 
> So, AIUI you want to have a self-contained "log" structure which can be
> pointed from setup_indirect or Multiboot2. Am I right? If this is true
> then I am OK with the idea. 

Correct.

> However, I would like to ask you to involve other interested groups
> and people in further discussions, e.g. relevant Linux maintainers,
> BSD maintainers and Xen maintainers (yes, Xen is using Multiboot2). If
> you need some email addresses I can send you them.
> 

I'd greatly appreciate it if you'd be able to send me over the relevant
maintainers/mailing list addresses.


Thanks!

-- 
Max Tottenham       | address@hidden
Senior Software Engineer, Server Platform Engineering
/(* Akamai Technologies