Re: [SeaBIOS] seabios: acpi: add _RMV control method for PCI devices

[Avi Kivity]

      On 12/13/2010 11:03 AM, Gleb Natapov wrote:
   We could also
deprecate the old port and use fwcfg for everything
  (try fwcfg, fall back to ae00).
 fwcfg designed to be simple for easy use by firmware. It has two port
 one for index another for value, so its use is racy in multi-threaded SMP
 environment. DSDT code is executed in such environment. There is lock
 facility in AML, but why complicate things.
I prefer to remove complexity from interfaces and have it in the 
implementation instead.

    We could do
this in two ways: by adding a fwcfg client to the DSDT,
   or by copying the information to system memory, and referencing
   system memory from the DSDT.
This is even worse. It requires some fixed address to be shared between
DSDT and Seabios (or alternatively Seabios will have to generate this
part of DSDT dynamically).
  Could easily be something in the F segment.
 Yes, but then we will have two magic values (fwcfg index + address
 in F segment) instead of one (address of pci hot-plug controller).
The F segment address is internal to SeaBIOS; it isn't an external 
interface.

-- 
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