Re: [PATCH] [Firmware] TCG BIOS extensions for the Bochs BIOS

[Keir Fraser <keir@xensource.com>]

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On 12/12/06 3:25 pm, "Stefan Berger" <stefanb@us.ibm.com> wrote:

> Since I am running out of space in the BIOS segment now while converting the
> functions to 'C'...
> Do you know of some good 'constructs' that can be left in the rombios as
> markers for linking the two pieces? I'd like to start with lifting up a single
> function into 32 bit space and then continuously put more up there, but get
> the linking right. Probably funneling everything through a single function and
> demultiplexing in 32 bit space is not what we would want.
> 
> I suppose HVMloader will have to carry a relocateable file (-fPIC) and be able
> to re-locate it to whatever memory could be reserved.

How about just have a table below 1MB, indexed by function id (where
function ids also are statically allocated too). This table will be produced
as part of the building and linking of the 32-bit extensions (it¹ll probably
be a C array of pointers, in its own data section which the linker will know
to place at the very start of the extension ROM): it can then be patched
into the rombios at compile time, or copied to a pre-decided address below
1MB by hvmloader at boot time.

 -- Keir


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