busno.c

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/*
 * PROJECT:         ReactOS PCI Bus Driver
 * LICENSE:         BSD - See COPYING.ARM in the top level directory
 * FILE:            drivers/bus/pci/pci/busno.c
 * PURPOSE:         Bus Number Management
 * PROGRAMMERS:     ReactOS Portable Systems Group
 */
 
/* INCLUDES *******************************************************************/
 
#include <pci.h>
 
#define NDEBUG
#include <debug.h>
 
/* FUNCTIONS ******************************************************************/
 
BOOLEAN
NTAPI
PciAreBusNumbersConfigured(IN PPCI_PDO_EXTENSION PdoExtension)
{
    UCHAR PrimaryBus, BaseBus, SecondaryBus, SubordinateBus;
 
    PAGED_CODE();
 
    /* Get all relevant bus number details */
    PrimaryBus = PdoExtension->Dependent.type1.PrimaryBus;
    BaseBus = PdoExtension->ParentFdoExtension->BaseBus;
    SecondaryBus = PdoExtension->Dependent.type1.SecondaryBus;
    SubordinateBus = PdoExtension->Dependent.type1.SubordinateBus;
 
    /* The primary bus should be the base bus of the parent */
    if ((PrimaryBus != BaseBus) || (SecondaryBus <= PrimaryBus)) return FALSE;
 
    /* The subordinate should be a higher bus number than the secondary */
    return SubordinateBus >= SecondaryBus;
}
 
/* EOF */