/*++


Copyright (c) 1993  Microsoft Corporationn, Digital Equipment Corporation

Module Name:

    pcibus.c

Abstract:

    Platform-specific PCI bus routines

Author:

Environment:

    Kernel mode

Revision History:


--*/

#include "halp.h"
#include "pci.h"
#include "pcip.h"
#include "machdep.h"

//
// This references a boolean variable that identifies the APECS revision.
//

extern ULONG PCIMaxBus;



PCI_CONFIGURATION_TYPES
HalpPCIConfigCycleType(
    IN PBUS_HANDLER BusHandler
    )
{
    if (BusHandler->BusNumber == 0) {
        return PciConfigType0;
    } else {
        return PciConfigType1;
    }
}


VOID
HalpPCIConfigAddr (
    IN PBUS_HANDLER     BusHandler,
    IN PCI_SLOT_NUMBER  Slot,
    PPCI_CFG_CYCLE_BITS pPciAddr
    )
{
    PCI_CONFIGURATION_TYPES ConfigType;

    ConfigType = HalpPCIConfigCycleType(BusHandler);

    if (ConfigType == PciConfigType0)
    {
       //
       // Initialize PciAddr for a type 0 configuration cycle
       //
       // Device number is mapped to address bits 11:24, which, in APECS
       // pass 1, are wired to IDSEL pins.  In pass 2, the format of a type
       // 0 cycle is the same as the format of a type 1.  Note that 
       // HalpValidPCISlot has already done bounds checking on DeviceNumber.
       //
       // PciAddr can be intialized for different bus numbers
       // with distinct configuration spaces here.
       //

       pPciAddr->u.AsULONG =  (ULONG) APECS_PCI_CONFIG_BASE_QVA;
       pPciAddr->u.AsULONG += ( (Slot.u.bits.DeviceNumber) << 11 );
       pPciAddr->u.bits0.FunctionNumber = Slot.u.bits.FunctionNumber;
       pPciAddr->u.bits0.Reserved1 = PciConfigType0;

#if HALDBG
       DbgPrint("HalpPCIConfigAddr: Type 0 PCI Config Access @ %x\n", pPciAddr->u.AsULONG);
#endif // DBG

    }
    else
    {
       //
       // Initialize PciAddr for a type 1 configuration cycle
       //
       //

       pPciAddr->u.AsULONG = (ULONG) APECS_PCI_CONFIG_BASE_QVA;
       pPciAddr->u.bits1.BusNumber = BusHandler->BusNumber;
       pPciAddr->u.bits1.FunctionNumber = Slot.u.bits.FunctionNumber;
       pPciAddr->u.bits1.DeviceNumber = Slot.u.bits.DeviceNumber;
       pPciAddr->u.bits1.Reserved1 = PciConfigType1;
       
#if HALDBG
       DbgPrint("Type 1 PCI Config Access @ %x\n", pPciAddr->u.AsULONG);
#endif // DBG
      
     }

     return;
}