[Bug 20012] New: Implement HalGetBusDataByOffset for the PCIConfiguration BusDataType

http://bugs.winehq.org/show_bug.cgi?id=20012

Summary: Implement HalGetBusDataByOffset for the
                    PCIConfiguration BusDataType
           Product: Wine
           Version: 1.1.29
          Platform: PC
               URL: http://rh-software.com/
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: trivial
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=23551)
 --> (http://bugs.winehq.org/attachment.cgi?id=23551)
Scren capture showing example code working

With the fix http://bugs.winehq.org/show_bug.cgi?id=19966 SIV
(http://rh-software.com/) no longer crashes when run under Wine, however none
of the PCI Bus reporting actually works.  As an experiment I wrote some code to
read the PCI confutation data from "/sys/bus/pci/devices/0000:bb:dd.f/config"
where bb:dd:f are the Bus, Device and Function numbers (the Device and Function
are bits 7...3 and 2...0 of the slot number. The attached screen shot you can
see I was able to read the data what HalGetBusDataByOffset() should return.  I
actually did this using the Windows API functions using the following code:
          if( ( fhl = CreateFile( file_name,
                                  GENERIC_READ,
                                  FILE_SHARE_READ | FILE_SHARE_WRITE,
                                  NULL,
                                  OPEN_EXISTING,
                                  0,
                                  NULL ) ) != INVALID_HANDLE_VALUE )
          {
            if( ReadFile( fhl, data, sizeof( data ) &len, NULL ) )
            {
              ...
            }
            CloseHandle( fhl );
but I would expect the Unix/Linux Native API should be used were this to be
implemented.  I am concerned that different Unix/Linux systems may have
different device names, but looking at the lspci source there seems to be a pci
library to address this.  I could try and work-a-round this within SIV, but as
SIV would probably not be able to use the Unix/Linux pci library that solution
would be less portable than implementing a solution within
HalGetBusDataByOffset() within Wine.  For systems where this data could not be
returned then the current return of 0 (PCI Bus does not exist) would be made. 
Note that in the case of the Bus existing and the slot being empty a return of
2 is expected.