[Qemu-devel] Re: [PATCH] x86: Manage BIOS boot menu via command line

[Jan Kiszka <jan.kiszka@web.de>]

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Laurent Vivier wrote:
> 
> Le 18 déc. 08 à 18:41, Gleb Natapov a écrit :
> 
>> On Thu, Dec 18, 2008 at 11:23:16AM -0600, Anthony Liguori wrote:
>>>> I'm open for the firmware config if you explain to me how state
>>>> information is supposed to be transfered from rombios32.c (where the
>>>> fw_cfg is evaluated) to some function in rombios.c. Tried this but
>>>> found
>>>> nothing obvious.
>>>>
>>>
>>> Gleb, could you comment here?  I'm obviously ignorant of the firmware
>>> config code in the BIOS.  It seems like the right thing to use but if
>>> it's all the current support is in 32-bit code, it may be difficult to
>>> use that within the 16-bit code without rewriting it all.
>>>
>> Firmware config is accessed by inb/outw IO instructions so it should be
>> easy to do that from rombios.c. But it is possible to read the option
>> in rombios32.c and put it somewhere in unused space in 0x400 and check
>> the value from rombios.c.
> 
> 
> Look at my patches to add splash screen: they use firmware configuration
> device from rombios.c.

If replicating qemu_cfg_port_probe & friends is OK, we should at least
agree on using common helpers within those two bios domains.

Jan


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