drivers/bus/pcix/pci/busno.c

   1 /*
   2  * PROJECT:         ReactOS PCI Bus Driver
   3  * LICENSE:         BSD - See COPYING.ARM in the top level directory
   4  * FILE:            drivers/bus/pci/pci/busno.c
   5  * PURPOSE:         Bus Number Management
   6  * PROGRAMMERS:     ReactOS Portable Systems Group
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #include <pci.h>
  12 #define NDEBUG
  13 #include <debug.h>
  14
  15 /* GLOBALS ********************************************************************/
  16
  17 /* FUNCTIONS ******************************************************************/
  18
  19 BOOLEAN
  20 NTAPI
  21 PciAreBusNumbersConfigured(IN PPCI_PDO_EXTENSION PdoExtension)
  22 {
  23     UCHAR PrimaryBus, BaseBus, SecondaryBus, SubordinateBus;
  24
  25     PAGED_CODE();
  26
  27     /* Get all relevant bus number details */
  28     PrimaryBus = PdoExtension->Dependent.type1.PrimaryBus;
  29     BaseBus = PdoExtension->ParentFdoExtension->BaseBus;
  30     SecondaryBus = PdoExtension->Dependent.type1.SecondaryBus;
  31     SubordinateBus = PdoExtension->Dependent.type1.SubordinateBus;
  32
  33     /* The primary bus should be the base bus of the parent */
  34     if ((PrimaryBus != BaseBus) || (SecondaryBus <= PrimaryBus)) return FALSE;
  35
  36     /* The subordinate should be a higher bus number than the secondary */
  37     return SubordinateBus >= SecondaryBus;
  38 }
  39
  40 /* EOF */