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Re: [RFC] Tagged mbi

From: Vladimir 'φ-coder/phcoder' Serbinenko
Subject: Re: [RFC] Tagged mbi
Date: Thu, 07 Jan 2010 22:32:47 +0100
User-agent: Mozilla-Thunderbird (X11/20091109)

Robert Millan wrote:
> On Mon, Jan 04, 2010 at 10:12:51PM +0100, Vladimir 'φ-coder/phcoder' 
> Serbinenko wrote:
>> Hello. Currently mbi contains a lot of pointers and substructures. It's
>> has various problems like:
>> -Unused fields occupy space if any subsequent fields is used.
>> -Difficult to relocate since it may be spilled all over the memory
>> -It's unstraightforward to e.g. specify 2 framebuffers
> Seems like there's a problem indeed.
>> I propose to use tagged MBI.
> Can you provide a short explanation on this proposed solution?  You explained
> the problem, but not the solution.
The solution is to have so called tags. Tag is a structure which begins
with fields "size" and "type" and the rest of the content is determined
by these 2 fields. Tags follow each other and the end of structure is a
predefined tag. This way it's easy to skip unknown tags because of size
field, easy to relocate because mbi is in a contiguous chunk of memory.
Same type of tag may appear multiple times declaring e.g. 2
framebuffers. Details are in spec patch

Vladimir 'φ-coder/phcoder' Serbinenko

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