utils.c File Reference

#include <pci.h>
#include <debug.h>

Include dependency graph for utils.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
BOOLEAN NTAPI	PciUnicodeStringStrStr (IN PUNICODE_STRING InputString, IN PCUNICODE_STRING EqualString, IN BOOLEAN CaseInSensitive)
BOOLEAN NTAPI	PciStringToUSHORT (IN PWCHAR String, OUT PUSHORT Value)
BOOLEAN NTAPI	PciIsSuiteVersion (IN USHORT SuiteMask)
BOOLEAN NTAPI	PciIsDatacenter (VOID)
BOOLEAN NTAPI	PciOpenKey (IN PWCHAR KeyName, IN HANDLE RootKey, IN ACCESS_MASK DesiredAccess, OUT PHANDLE KeyHandle, OUT PNTSTATUS KeyStatus)
NTSTATUS NTAPI	PciGetRegistryValue (IN PWCHAR ValueName, IN PWCHAR KeyName, IN HANDLE RootHandle, IN ULONG Type, OUT PVOID *OutputBuffer, OUT PULONG OutputLength)
NTSTATUS NTAPI	PciBuildDefaultExclusionLists (VOID)
PPCI_FDO_EXTENSION NTAPI	PciFindParentPciFdoExtension (IN PDEVICE_OBJECT DeviceObject, IN PKEVENT Lock)
VOID NTAPI	PciInsertEntryAtTail (IN PSINGLE_LIST_ENTRY ListHead, IN PPCI_FDO_EXTENSION DeviceExtension, IN PKEVENT Lock)
VOID NTAPI	PciInsertEntryAtHead (IN PSINGLE_LIST_ENTRY ListHead, IN PSINGLE_LIST_ENTRY Entry, IN PKEVENT Lock)
VOID NTAPI	PcipLinkSecondaryExtension (IN PSINGLE_LIST_ENTRY List, IN PVOID Lock, IN PPCI_SECONDARY_EXTENSION SecondaryExtension, IN PCI_SIGNATURE ExtensionType, IN PVOID Destructor)
NTSTATUS NTAPI	PciGetDeviceProperty (IN PDEVICE_OBJECT DeviceObject, IN DEVICE_REGISTRY_PROPERTY DeviceProperty, OUT PVOID *OutputBuffer)
NTSTATUS NTAPI	PciSendIoctl (IN PDEVICE_OBJECT DeviceObject, IN ULONG IoControlCode, IN PVOID InputBuffer, IN ULONG InputBufferLength, IN PVOID OutputBuffer, IN ULONG OutputBufferLength)
PPCI_SECONDARY_EXTENSION NTAPI	PciFindNextSecondaryExtension (IN PSINGLE_LIST_ENTRY ListHead, IN PCI_SIGNATURE ExtensionType)
ULONGLONG NTAPI	PciGetHackFlags (IN USHORT VendorId, IN USHORT DeviceId, IN USHORT SubVendorId, IN USHORT SubSystemId, IN UCHAR RevisionId)
BOOLEAN NTAPI	PciIsCriticalDeviceClass (IN UCHAR BaseClass, IN UCHAR SubClass)
PPCI_PDO_EXTENSION NTAPI	PciFindPdoByFunction (IN PPCI_FDO_EXTENSION DeviceExtension, IN ULONG FunctionNumber, IN PPCI_COMMON_HEADER PciData)
BOOLEAN NTAPI	PciIsDeviceOnDebugPath (IN PPCI_PDO_EXTENSION DeviceExtension)
NTSTATUS NTAPI	PciGetBiosConfig (IN PPCI_PDO_EXTENSION DeviceExtension, OUT PPCI_COMMON_HEADER PciData)
NTSTATUS NTAPI	PciSaveBiosConfig (IN PPCI_PDO_EXTENSION DeviceExtension, IN PPCI_COMMON_HEADER PciData)
UCHAR NTAPI	PciReadDeviceCapability (IN PPCI_PDO_EXTENSION DeviceExtension, IN UCHAR Offset, IN ULONG CapabilityId, OUT PPCI_CAPABILITIES_HEADER Buffer, IN ULONG Length)
BOOLEAN NTAPI	PciCanDisableDecodes (IN PPCI_PDO_EXTENSION DeviceExtension, IN PPCI_COMMON_HEADER Config, IN ULONGLONG HackFlags, IN BOOLEAN ForPowerDown)
PCI_DEVICE_TYPES NTAPI	PciClassifyDeviceType (IN PPCI_PDO_EXTENSION PdoExtension)
ULONG_PTR NTAPI	PciExecuteCriticalSystemRoutine (IN ULONG_PTR IpiContext)
BOOLEAN NTAPI	PciIsSlotPresentInParentMethod (IN PPCI_PDO_EXTENSION PdoExtension, IN ULONG Method)
ULONG NTAPI	PciGetLengthFromBar (IN ULONG Bar)
BOOLEAN NTAPI	PciCreateIoDescriptorFromBarLimit (PIO_RESOURCE_DESCRIPTOR ResourceDescriptor, IN PULONG BarArray, IN BOOLEAN Rom)
VOID NTAPI	PciDecodeEnable (IN PPCI_PDO_EXTENSION PdoExtension, IN BOOLEAN Enable, OUT PUSHORT Command)
NTSTATUS NTAPI	PciQueryBusInformation (IN PPCI_PDO_EXTENSION PdoExtension, IN PPNP_BUS_INFORMATION *Buffer)
NTSTATUS NTAPI	PciDetermineSlotNumber (IN PPCI_PDO_EXTENSION PdoExtension, OUT PULONG SlotNumber)
NTSTATUS NTAPI	PciGetDeviceCapabilities (IN PDEVICE_OBJECT DeviceObject, IN OUT PDEVICE_CAPABILITIES DeviceCapability)
NTSTATUS NTAPI	PciQueryPowerCapabilities (IN PPCI_PDO_EXTENSION PdoExtension, IN PDEVICE_CAPABILITIES DeviceCapability)
NTSTATUS NTAPI	PciQueryCapabilities (IN PPCI_PDO_EXTENSION PdoExtension, IN OUT PDEVICE_CAPABILITIES DeviceCapability)

Variables
ULONG	PciDebugPortsCount
RTL_RANGE_LIST	PciIsaBitExclusionList
RTL_RANGE_LIST	PciVgaAndIsaBitExclusionList

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 13 of file utils.c.

Function Documentation

PciBuildDefaultExclusionLists()

NTSTATUS NTAPI PciBuildDefaultExclusionLists

(

VOID

)

Definition at line 276 of file utils.c.

{
    ULONG Start;
    NTSTATUS Status;
    ASSERT(PciIsaBitExclusionList.Count == 0);
    ASSERT(PciVgaAndIsaBitExclusionList.Count == 0);

    /* Initialize the range lists */
    RtlInitializeRangeList(&PciIsaBitExclusionList);
    RtlInitializeRangeList(&PciVgaAndIsaBitExclusionList);

    /* Loop x86 I/O ranges */
    for (Start = 0x100; Start <= 0xFEFF; Start += 0x400)
    {
        /* Add the ISA I/O ranges */
        Status = RtlAddRange(&PciIsaBitExclusionList,
                             Start,
                             Start + 0x2FF,
                             0,
                             RTL_RANGE_LIST_ADD_IF_CONFLICT,
                             NULL,
                             NULL);
        if (!NT_SUCCESS(Status)) break;

        /* Add the ISA I/O ranges */
        Status = RtlAddRange(&PciVgaAndIsaBitExclusionList,
                             Start,
                             Start + 0x2AF,
                             0,
                             RTL_RANGE_LIST_ADD_IF_CONFLICT,
                             NULL,
                             NULL);
        if (!NT_SUCCESS(Status)) break;

        /* Add the VGA I/O range for Monochrome Video */
        Status = RtlAddRange(&PciVgaAndIsaBitExclusionList,
                             Start + 0x2BC,
                             Start + 0x2BF,
                             0,
                             RTL_RANGE_LIST_ADD_IF_CONFLICT,
                             NULL,
                             NULL);
        if (!NT_SUCCESS(Status)) break;

        /* Add the VGA I/O range for certain CGA adapters */
        Status = RtlAddRange(&PciVgaAndIsaBitExclusionList,
                             Start + 0x2E0,
                             Start + 0x2FF,
                             0,
                             RTL_RANGE_LIST_ADD_IF_CONFLICT,
                             NULL,
                             NULL);
        if (!NT_SUCCESS(Status)) break;

        /* Success, ranges added done */
    };

    RtlFreeRangeList(&PciIsaBitExclusionList);
    RtlFreeRangeList(&PciVgaAndIsaBitExclusionList);
    return Status;
}

Referenced by DriverEntry().

PciCanDisableDecodes()

BOOLEAN NTAPI PciCanDisableDecodes	(	IN PPCI_PDO_EXTENSION	DeviceExtension,
		IN PPCI_COMMON_HEADER	Config,
		IN ULONGLONG	HackFlags,
		IN BOOLEAN	ForPowerDown
	)

Definition at line 955 of file utils.c.

{
    UCHAR BaseClass, SubClass;
    BOOLEAN IsVga;

    /* Is there a device extension or should the PCI header be used? */
    if (DeviceExtension)
    {
        /* Never disable decodes for a debug PCI Device */
        if (DeviceExtension->OnDebugPath) return FALSE;

        /* Hack flags will be obtained from the extension, not the caller */
        ASSERT(HackFlags == 0);

        /* Get hacks and classification from the device extension */
        HackFlags = DeviceExtension->HackFlags;
        SubClass = DeviceExtension->SubClass;
        BaseClass = DeviceExtension->BaseClass;
    }
    else
    {
        /* There must be a PCI header, go read the classification information */
        ASSERT(Config != NULL);
        BaseClass = Config->BaseClass;
        SubClass = Config->SubClass;
    }

    /* Check for hack flags that prevent disabling the decodes */
    if (HackFlags & (PCI_HACK_PRESERVE_COMMAND |
                     PCI_HACK_CB_SHARE_CMD_BITS |
                     PCI_HACK_DONT_DISABLE_DECODES))
    {
        /* Don't do it */
        return FALSE;
    }

    /* Is this a VGA adapter? */
    if ((BaseClass == PCI_CLASS_DISPLAY_CTLR) &&
        (SubClass == PCI_SUBCLASS_VID_VGA_CTLR))
    {
        /* Never disable decodes if this is for power down */
        return ForPowerDown;
    }

    /* Check for legacy devices */
    if (BaseClass == PCI_CLASS_PRE_20)
    {
        /* Never disable video adapter cards if this is for power down */
        if (SubClass == PCI_SUBCLASS_PRE_20_VGA) return ForPowerDown;
    }
    else if (BaseClass == PCI_CLASS_DISPLAY_CTLR)
    {
        /* Never disable VGA adapters if this is for power down */
        if (SubClass == PCI_SUBCLASS_VID_VGA_CTLR) return ForPowerDown;
    }
    else if (BaseClass == PCI_CLASS_BRIDGE_DEV)
    {
        /* Check for legacy bridges */
        if ((SubClass == PCI_SUBCLASS_BR_ISA) ||
            (SubClass == PCI_SUBCLASS_BR_EISA) ||
            (SubClass == PCI_SUBCLASS_BR_MCA) ||
            (SubClass == PCI_SUBCLASS_BR_HOST) ||
            (SubClass == PCI_SUBCLASS_BR_OTHER))
        {
            /* Never disable these */
            return FALSE;
        }
        else if ((SubClass == PCI_SUBCLASS_BR_PCI_TO_PCI) ||
                 (SubClass == PCI_SUBCLASS_BR_CARDBUS))
        {
            /* This is a supported bridge, but does it have a VGA card? */
            if (!DeviceExtension)
            {
                /* Read the bridge control flag from the PCI header */
                IsVga = Config->u.type1.BridgeControl & PCI_ENABLE_BRIDGE_VGA;
            }
            else
            {
                /* Read the cached flag in the device extension */
                IsVga = DeviceExtension->Dependent.type1.VgaBitSet;
            }

            /* Never disable VGA adapters if this is for power down */
            if (IsVga) return ForPowerDown;
        }
    }

    /* Finally, never disable decodes if there's no power management */
    return !(HackFlags & PCI_HACK_NO_PM_CAPS);
}

Referenced by PciDecodeEnable(), and PciSetPowerManagedDevicePowerState().

PciClassifyDeviceType()

PCI_DEVICE_TYPES NTAPI PciClassifyDeviceType

(

IN PPCI_PDO_EXTENSION

PdoExtension

)

Definition at line 1051 of file utils.c.

{
    ASSERT(PdoExtension->ExtensionType == PciPdoExtensionType);

    /* Differentiate between devices and bridges */
    if (PdoExtension->BaseClass != PCI_CLASS_BRIDGE_DEV) return PciTypeDevice;

    /* The PCI Bus driver handles only CardBus and PCI bridges (plus host) */
    if (PdoExtension->SubClass == PCI_SUBCLASS_BR_HOST) return PciTypeHostBridge;
    if (PdoExtension->SubClass == PCI_SUBCLASS_BR_PCI_TO_PCI) return PciTypePciBridge;
    if (PdoExtension->SubClass == PCI_SUBCLASS_BR_CARDBUS) return PciTypeCardbusBridge;

    /* Any other kind of bridge is treated like a device */
    return PciTypeDevice;
}

Referenced by PciProcessBus().

PciCreateIoDescriptorFromBarLimit()

BOOLEAN NTAPI PciCreateIoDescriptorFromBarLimit	(	PIO_RESOURCE_DESCRIPTOR	ResourceDescriptor,
		IN PULONG	BarArray,
		IN BOOLEAN	Rom
	)

Definition at line 1175 of file utils.c.

{
    ULONG CurrentBar, BarLength, BarMask;
    BOOLEAN Is64BitBar = FALSE;

    /* Check if the BAR is nor I/O nor memory */
    CurrentBar = BarArray[0];
    if (!(CurrentBar & ~PCI_ADDRESS_IO_SPACE))
    {
        /* Fail this descriptor */
        ResourceDescriptor->Type = CmResourceTypeNull;
        return FALSE;
    }

    /* Set default flag and clear high words */
    ResourceDescriptor->Flags = 0;
    ResourceDescriptor->u.Generic.MaximumAddress.HighPart = 0;
    ResourceDescriptor->u.Generic.MinimumAddress.LowPart = 0;
    ResourceDescriptor->u.Generic.MinimumAddress.HighPart = 0;

    /* Check for ROM Address */
    if (Rom)
    {
        /* Clean up the BAR to get just the address */
        CurrentBar &= PCI_ADDRESS_ROM_ADDRESS_MASK;
        if (!CurrentBar)
        {
            /* Invalid ar, fail this descriptor */
            ResourceDescriptor->Type = CmResourceTypeNull;
            return FALSE;
        }

        /* ROM Addresses are always read only */
        ResourceDescriptor->Flags = CM_RESOURCE_MEMORY_READ_ONLY;
    }

    /* Compute the length, assume it's the alignment for now */
    BarLength = PciGetLengthFromBar(CurrentBar);
    ResourceDescriptor->u.Generic.Length = BarLength;
    ResourceDescriptor->u.Generic.Alignment = BarLength;

    /* Check what kind of BAR this is */
    if (CurrentBar & PCI_ADDRESS_IO_SPACE)
    {
        /* Use correct mask to decode the address */
        BarMask = PCI_ADDRESS_IO_ADDRESS_MASK;

        /* Set this as an I/O Port descriptor */
        ResourceDescriptor->Type = CmResourceTypePort;
        ResourceDescriptor->Flags = CM_RESOURCE_PORT_IO;
    }
    else
    {
        /* Use correct mask to decode the address */
        BarMask = PCI_ADDRESS_MEMORY_ADDRESS_MASK;

        /* Set this as a memory descriptor */
        ResourceDescriptor->Type = CmResourceTypeMemory;

        /* Check if it's 64-bit or 20-bit decode */
        if ((CurrentBar & PCI_ADDRESS_MEMORY_TYPE_MASK) == PCI_TYPE_64BIT)
        {
            /* The next BAR has the high word, read it */
            ResourceDescriptor->u.Port.MaximumAddress.HighPart = BarArray[1];
            Is64BitBar = TRUE;
        }
        else if ((CurrentBar & PCI_ADDRESS_MEMORY_TYPE_MASK) == PCI_TYPE_20BIT)
        {
            /* Use the correct mask to decode the address */
            BarMask = ~0xFFF0000F;
        }

        /* Check if the BAR is listed as prefetchable memory */
        if (CurrentBar & PCI_ADDRESS_MEMORY_PREFETCHABLE)
        {
            /* Mark the descriptor in the same way */
            ResourceDescriptor->Flags |= CM_RESOURCE_MEMORY_PREFETCHABLE;
        }
    }

    /* Now write down the maximum address based on the base + length */
    ResourceDescriptor->u.Port.MaximumAddress.QuadPart = (CurrentBar & BarMask) +
                                                         BarLength - 1;

    /* Return if this is a 64-bit BAR, so the loop code knows to skip the next one */
    return Is64BitBar;
}

Referenced by Device_SaveLimits(), and PPBridge_SaveLimits().

PciDecodeEnable()

VOID NTAPI PciDecodeEnable	(	IN PPCI_PDO_EXTENSION	PdoExtension,
		IN BOOLEAN	Enable,
		OUT PUSHORT	Command
	)

Definition at line 1267 of file utils.c.

{
    USHORT CommandValue;

    /*
     * If decodes are being disabled, make sure it's allowed, and in both cases,
     * make sure that a hackflag isn't preventing touching the decodes at all.
     */
    if (((Enable) || (PciCanDisableDecodes(PdoExtension, 0, 0, 0))) &&
        !(PdoExtension->HackFlags & PCI_HACK_PRESERVE_COMMAND))
    {
        /* Did the caller already have a command word? */
        if (Command)
        {
            /* Use the caller's */
            CommandValue = *Command;
        }
        else
        {
            /* Otherwise, read the current command */
            PciReadDeviceConfig(PdoExtension,
                                &Command,
                                FIELD_OFFSET(PCI_COMMON_HEADER, Command),
                                sizeof(USHORT));
        }

        /* Turn off decodes by default */
        CommandValue &= ~(PCI_ENABLE_IO_SPACE |
                          PCI_ENABLE_MEMORY_SPACE |
                          PCI_ENABLE_BUS_MASTER);

        /* If requested, enable the decodes that were enabled at init time */
        if (Enable) CommandValue |= PdoExtension->CommandEnables &
                                    (PCI_ENABLE_IO_SPACE |
                                     PCI_ENABLE_MEMORY_SPACE |
                                     PCI_ENABLE_BUS_MASTER);

        /* Update the command word */
        PciWriteDeviceConfig(PdoExtension,
                             &CommandValue,
                             FIELD_OFFSET(PCI_COMMON_HEADER, Command),
                             sizeof(USHORT));
    }
}

Referenced by PciApplyHacks(), PciConfigureIdeController(), and PcipUpdateHardware().

PciDetermineSlotNumber()

NTSTATUS NTAPI PciDetermineSlotNumber	(	IN PPCI_PDO_EXTENSION	PdoExtension,
		OUT PULONG	SlotNumber
	)

Definition at line 1338 of file utils.c.

{
    PPCI_FDO_EXTENSION ParentExtension;
    ULONG ResultLength;
    NTSTATUS Status;
    PSLOT_INFO SlotInfo;

    /* Check if a $PIR from the BIOS is used (legacy IRQ routing) */
    ParentExtension = PdoExtension->ParentFdoExtension;
    DPRINT1("Slot lookup for %d.%u.%u\n",
            ParentExtension ? ParentExtension->BaseBus : -1,
            PdoExtension->Slot.u.bits.DeviceNumber,
            PdoExtension->Slot.u.bits.FunctionNumber);
    if ((PciIrqRoutingTable) && (ParentExtension))
    {
        /* Read every slot information entry */
        SlotInfo = &PciIrqRoutingTable->Slot[0];
        DPRINT1("PIR$ %p is %lx bytes, slot 0 is at: %p\n",
                PciIrqRoutingTable, PciIrqRoutingTable->TableSize, SlotInfo);
        while (SlotInfo < (PSLOT_INFO)((ULONG_PTR)PciIrqRoutingTable +
                                       PciIrqRoutingTable->TableSize))
        {
            DPRINT1("Slot Info: %u.%u->#%u\n",
                    SlotInfo->BusNumber,
                    SlotInfo->DeviceNumber,
                    SlotInfo->SlotNumber);

            /* Check if this slot information matches the PDO being queried */
            if ((ParentExtension->BaseBus == SlotInfo->BusNumber) &&
                (PdoExtension->Slot.u.bits.DeviceNumber == SlotInfo->DeviceNumber >> 3) &&
                (SlotInfo->SlotNumber))
            {
                /* We found it, return it and return success */
                *SlotNumber = SlotInfo->SlotNumber;
                return STATUS_SUCCESS;
            }

            /* Try the next slot */
            SlotInfo++;
        }
    }

    /* Otherwise, grab the parent FDO and check if it's the root */
    if (PCI_IS_ROOT_FDO(ParentExtension))
    {
        /* The root FDO doesn't have a slot number */
        Status = STATUS_UNSUCCESSFUL;
    }
    else
    {
        /* Otherwise, query the slot/UI address/number as a device property */
        Status = IoGetDeviceProperty(ParentExtension->PhysicalDeviceObject,
                                     DevicePropertyUINumber,
                                     sizeof(ULONG),
                                     SlotNumber,
                                     &ResultLength);
    }

    /* Return the status of this endeavour */
    return Status;
}

Referenced by PciQueryCapabilities().

PciExecuteCriticalSystemRoutine()

ULONG_PTR NTAPI PciExecuteCriticalSystemRoutine

(

IN ULONG_PTR

IpiContext

)

Definition at line 1069 of file utils.c.

{
    PPCI_IPI_CONTEXT Context = (PPCI_IPI_CONTEXT)IpiContext;

    /* Check if the IPI is already running */
    if (!InterlockedDecrement(&Context->RunCount))
    {
        /* Nope, this is the first instance, so execute the IPI function */
        Context->Function(Context->DeviceExtension, Context->Context);

        /* Notify anyone that was spinning that they can stop now */
        Context->Barrier = 0;
    }
    else
    {
        /* Spin until it has finished running */
        while (Context->Barrier);
    }

    /* Done */
    return 0;
}

PciFindNextSecondaryExtension()

PPCI_SECONDARY_EXTENSION NTAPI PciFindNextSecondaryExtension	(	IN PSINGLE_LIST_ENTRY	ListHead,
		IN PCI_SIGNATURE	ExtensionType
	)

Definition at line 584 of file utils.c.

{
    PSINGLE_LIST_ENTRY NextEntry;
    PPCI_SECONDARY_EXTENSION Extension;

    /* Scan the list */
    for (NextEntry = ListHead; NextEntry; NextEntry = NextEntry->Next)
    {
        /* Grab each extension and check if it's the one requested */
        Extension = CONTAINING_RECORD(NextEntry, PCI_SECONDARY_EXTENSION, List);
        if (Extension->ExtensionType == ExtensionType) return Extension;
    }

    /* Nothing was found */
    return NULL;
}

Referenced by ario_ApplyBrokenVideoHack(), and PciInitializeArbiterRanges().

PciFindParentPciFdoExtension()

PPCI_FDO_EXTENSION NTAPI PciFindParentPciFdoExtension	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PKEVENT	Lock
	)

Definition at line 340 of file utils.c.

{
    PPCI_FDO_EXTENSION DeviceExtension;
    PPCI_PDO_EXTENSION SearchExtension, FoundExtension;

    /* Assume we'll find nothing */
    SearchExtension = DeviceObject->DeviceExtension;
    FoundExtension = NULL;

    /* Check if a lock was specified */
    if (Lock)
    {
        /* Wait for the lock to be released */
        KeEnterCriticalRegion();
        KeWaitForSingleObject(Lock, Executive, KernelMode, FALSE, NULL);
    }

    /* Now search for the extension */
    DeviceExtension = (PPCI_FDO_EXTENSION)PciFdoExtensionListHead.Next;
    while (DeviceExtension)
    {
        /* Acquire this device's lock */
        KeEnterCriticalRegion();
        KeWaitForSingleObject(&DeviceExtension->ChildListLock,
                              Executive,
                              KernelMode,
                              FALSE,
                              NULL);

        /* Scan all children PDO, stop when no more PDOs, or found it */
        for (FoundExtension = DeviceExtension->ChildPdoList;
             ((FoundExtension) && (FoundExtension != SearchExtension));
             FoundExtension = FoundExtension->Next);

        /* Release this device's lock */
        KeSetEvent(&DeviceExtension->ChildListLock, IO_NO_INCREMENT, FALSE);
        KeLeaveCriticalRegion();

        /* If we found it, break out */
        if (FoundExtension) break;

        /* Move to the next device */
        DeviceExtension = (PPCI_FDO_EXTENSION)DeviceExtension->List.Next;
    }

    /* Check if we had acquired a lock previously */
    if (Lock)
    {
        /* Release it */
        KeSetEvent(Lock, IO_NO_INCREMENT, FALSE);
        KeLeaveCriticalRegion();
    }

    /* Return which extension was found, if any */
    return DeviceExtension;
}

Referenced by PciAddDevice().

PciFindPdoByFunction()

PPCI_PDO_EXTENSION NTAPI PciFindPdoByFunction	(	IN PPCI_FDO_EXTENSION	DeviceExtension,
		IN ULONG	FunctionNumber,
		IN PPCI_COMMON_HEADER	PciData
	)

Definition at line 695 of file utils.c.

{
    KIRQL Irql;
    PPCI_PDO_EXTENSION PdoExtension;

    /* Get the current IRQL when this call was made */
    Irql = KeGetCurrentIrql();

    /* Is this a low-IRQL call? */
    if (Irql < DISPATCH_LEVEL)
    {
        /* Acquire this device's lock */
        KeEnterCriticalRegion();
        KeWaitForSingleObject(&DeviceExtension->ChildListLock,
                              Executive,
                              KernelMode,
                              FALSE,
                              NULL);
    }

    /* Loop every child PDO */
    for (PdoExtension = DeviceExtension->ChildPdoList;
         PdoExtension;
         PdoExtension = PdoExtension->Next)
    {
        /* Find only enumerated PDOs */
        if (!PdoExtension->ReportedMissing)
        {
            /* Check if the function number and header data matches */
            if ((FunctionNumber == PdoExtension->Slot.u.AsULONG) &&
                (PdoExtension->VendorId == PciData->VendorID) &&
                (PdoExtension->DeviceId == PciData->DeviceID) &&
                (PdoExtension->RevisionId == PciData->RevisionID))
            {
                /* This is considered to be the same PDO */
                break;
            }
        }
    }

    /* Was this a low-IRQL call? */
    if (Irql < DISPATCH_LEVEL)
    {
        /* Release this device's lock */
        KeSetEvent(&DeviceExtension->ChildListLock, IO_NO_INCREMENT, FALSE);
        KeLeaveCriticalRegion();
    }

    /* If the search found something, this is non-NULL, otherwise it's NULL */
    return PdoExtension;
}

Referenced by PciScanBus().

PciGetBiosConfig()

NTSTATUS NTAPI PciGetBiosConfig	(	IN PPCI_PDO_EXTENSION	DeviceExtension,
		OUT PPCI_COMMON_HEADER	PciData
	)

Definition at line 768 of file utils.c.

{
    HANDLE KeyHandle, SubKeyHandle;
    OBJECT_ATTRIBUTES ObjectAttributes;
    UNICODE_STRING KeyName, KeyValue;
    WCHAR Buffer[32];
    WCHAR DataBuffer[sizeof(KEY_VALUE_PARTIAL_INFORMATION) + PCI_COMMON_HDR_LENGTH];
    PKEY_VALUE_PARTIAL_INFORMATION PartialInfo = (PVOID)DataBuffer;
    NTSTATUS Status;
    ULONG ResultLength;
    PAGED_CODE();

    /* Open the PCI key */
    Status = IoOpenDeviceRegistryKey(DeviceExtension->ParentFdoExtension->
                                     PhysicalDeviceObject,
                                     TRUE,
                                     KEY_ALL_ACCESS,
                                     &KeyHandle);
    if (!NT_SUCCESS(Status)) return Status;

    /* Create a volatile BIOS configuration key */
    RtlInitUnicodeString(&KeyName, L"BiosConfig");
    InitializeObjectAttributes(&ObjectAttributes,
                               &KeyName,
                               OBJ_KERNEL_HANDLE,
                               KeyHandle,
                               NULL);
    Status = ZwCreateKey(&SubKeyHandle,
                         KEY_READ,
                         &ObjectAttributes,
                         0,
                         NULL,
                         REG_OPTION_VOLATILE,
                         NULL);
    ZwClose(KeyHandle);
    if (!NT_SUCCESS(Status)) return Status;

    /* Create the key value based on the device and function number */
    swprintf(Buffer,
             L"DEV_%02x&FUN_%02x",
             DeviceExtension->Slot.u.bits.DeviceNumber,
             DeviceExtension->Slot.u.bits.FunctionNumber);
    RtlInitUnicodeString(&KeyValue, Buffer);

    /* Query the value information (PCI BIOS configuration header) */
    Status = ZwQueryValueKey(SubKeyHandle,
                             &KeyValue,
                             KeyValuePartialInformation,
                             PartialInfo,
                             sizeof(DataBuffer),
                             &ResultLength);
    ZwClose(SubKeyHandle);
    if (!NT_SUCCESS(Status)) return Status;

    /* If any information was returned, go ahead and copy its data */
    ASSERT(PartialInfo->DataLength == PCI_COMMON_HDR_LENGTH);
    RtlCopyMemory(PciData, PartialInfo->Data, PCI_COMMON_HDR_LENGTH);
    return Status;
}

Referenced by PciScanBus(), and PPBridge_SaveCurrentSettings().

PciGetDeviceCapabilities()

NTSTATUS NTAPI PciGetDeviceCapabilities	(	IN PDEVICE_OBJECT	DeviceObject,
		IN OUT PDEVICE_CAPABILITIES	DeviceCapability
	)

Definition at line 1403 of file utils.c.

{
    PIRP Irp;
    NTSTATUS Status;
    KEVENT Event;
    PDEVICE_OBJECT AttachedDevice;
    PIO_STACK_LOCATION IoStackLocation;
    IO_STATUS_BLOCK IoStatusBlock;
    PAGED_CODE();

    /* Zero out capabilities and set undefined values to start with */
    RtlZeroMemory(DeviceCapability, sizeof(DEVICE_CAPABILITIES));
    DeviceCapability->Size = sizeof(DEVICE_CAPABILITIES);
    DeviceCapability->Version = 1;
    DeviceCapability->Address = -1;
    DeviceCapability->UINumber = -1;

    /* Build the wait event for the IOCTL */
    KeInitializeEvent(&Event, SynchronizationEvent, FALSE);

    /* Find the device the PDO is attached to */
    AttachedDevice = IoGetAttachedDeviceReference(DeviceObject);

    /* And build an IRP for it */
    Irp = IoBuildSynchronousFsdRequest(IRP_MJ_PNP,
                                       AttachedDevice,
                                       NULL,
                                       0,
                                       NULL,
                                       &Event,
                                       &IoStatusBlock);
    if (!Irp)
    {
        /* The IRP failed, fail the request as well */
        ObDereferenceObject(AttachedDevice);
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    /* Set default status */
    Irp->IoStatus.Information = 0;
    Irp->IoStatus.Status = STATUS_NOT_SUPPORTED;

    /* Get a stack location in this IRP */
    IoStackLocation = IoGetNextIrpStackLocation(Irp);
    ASSERT(IoStackLocation);

    /* Initialize it as a query capabilities IRP, with no completion routine */
    RtlZeroMemory(IoStackLocation, sizeof(IO_STACK_LOCATION));
    IoStackLocation->MajorFunction = IRP_MJ_PNP;
    IoStackLocation->MinorFunction = IRP_MN_QUERY_CAPABILITIES;
    IoStackLocation->Parameters.DeviceCapabilities.Capabilities = DeviceCapability;
    IoSetCompletionRoutine(Irp, NULL, NULL, FALSE, FALSE, FALSE);

    /* Send the IOCTL to the driver */
    Status = IoCallDriver(AttachedDevice, Irp);
    if (Status == STATUS_PENDING)
    {
        /* Wait for a response and update the actual status */
        KeWaitForSingleObject(&Event,
                              Executive,
                              KernelMode,
                              FALSE,
                              NULL);
        Status = Irp->IoStatus.Status;
    }

    /* Done, dereference the attached device and return the final result */
    ObDereferenceObject(AttachedDevice);
    return Status;
}

Referenced by PciQueryPowerCapabilities().

PciGetDeviceProperty()

NTSTATUS NTAPI PciGetDeviceProperty	(	IN PDEVICE_OBJECT	DeviceObject,
		IN DEVICE_REGISTRY_PROPERTY	DeviceProperty,
		OUT PVOID *	OutputBuffer
	)

Definition at line 475 of file utils.c.

{
    NTSTATUS Status;
    ULONG BufferLength, ResultLength;
    PVOID Buffer;
    do
    {
        /* Query the requested property size */
        Status = IoGetDeviceProperty(DeviceObject,
                                     DeviceProperty,
                                     0,
                                     NULL,
                                     &BufferLength);
        if (Status != STATUS_BUFFER_TOO_SMALL)
        {
            /* Call should've failed with buffer too small! */
            DPRINT1("PCI - Unexpected status from GetDeviceProperty, saw %08X, expected %08X.\n",
                    Status,
                    STATUS_BUFFER_TOO_SMALL);
            *OutputBuffer = NULL;
            ASSERTMSG("PCI Successfully did the impossible!\n", FALSE);
            break;
        }

        /* Allocate the required buffer */
        Buffer = ExAllocatePoolWithTag(PagedPool, BufferLength, 'BicP');
        if (!Buffer)
        {
            /* No memory, fail the request */
            DPRINT1("PCI - Failed to allocate DeviceProperty buffer (%u bytes).\n", BufferLength);
            Status = STATUS_INSUFFICIENT_RESOURCES;
            break;
        }

        /* Do the actual property query call */
        Status = IoGetDeviceProperty(DeviceObject,
                                     DeviceProperty,
                                     BufferLength,
                                     Buffer,
                                     &ResultLength);
        if (!NT_SUCCESS(Status)) break;

        /* Return the buffer to the caller */
        ASSERT(BufferLength == ResultLength);
        *OutputBuffer = Buffer;
        return STATUS_SUCCESS;
    } while (FALSE);

    /* Failure path */
    return STATUS_UNSUCCESSFUL;
}

Referenced by PciAddDevice().

PciGetHackFlags()

ULONGLONG NTAPI PciGetHackFlags	(	IN USHORT	VendorId,
		IN USHORT	DeviceId,
		IN USHORT	SubVendorId,
		IN USHORT	SubSystemId,
		IN UCHAR	RevisionId
	)

Definition at line 604 of file utils.c.

{
    PPCI_HACK_ENTRY HackEntry;
    ULONGLONG HackFlags;
    ULONG LastWeight, MatchWeight;
    ULONG EntryFlags;

    /* ReactOS SetupLDR Hack */
    if (!PciHackTable) return 0;

    /* Initialize the variables before looping */
    LastWeight = 0;
    HackFlags = 0;
    ASSERT(PciHackTable);

    /* Scan the hack table */
    for (HackEntry = PciHackTable;
         HackEntry->VendorID != PCI_INVALID_VENDORID;
         ++HackEntry)
    {
        /* Check if there's an entry for this device */
        if ((HackEntry->DeviceID == DeviceId) &&
            (HackEntry->VendorID == VendorId))
        {
            /* This is a basic match */
            EntryFlags = HackEntry->Flags;
            MatchWeight = 1;

            /* Does the entry have revision information? */
            if (EntryFlags & PCI_HACK_HAS_REVISION_INFO)
            {
                /* Check if the revision matches, if so, this is a better match */
                if (HackEntry->RevisionID != RevisionId) continue;
                MatchWeight = 3;
            }

            /* Does the netry have subsystem information? */
            if (EntryFlags & PCI_HACK_HAS_SUBSYSTEM_INFO)
            {
                /* Check if it matches, if so, this is the best possible match */
                if ((HackEntry->SubVendorID != SubVendorId) ||
                    (HackEntry->SubSystemID != SubSystemId))
                {
                    continue;
                }
                MatchWeight += 4;
            }

            /* Is this the best match yet? */
            if (MatchWeight > LastWeight)
            {
                /* This is the best match for now, use this as the hack flags */
                HackFlags = HackEntry->HackFlags;
                LastWeight = MatchWeight;
            }
        }
    }

    /* Return the best match */
    return HackFlags;
}

Referenced by PciScanBus().

PciGetLengthFromBar()

ULONG NTAPI PciGetLengthFromBar

(

IN ULONG

Bar

)

Definition at line 1158 of file utils.c.

{
    ULONG Length;

    /* I/O addresses vs. memory addresses start differently due to alignment */
    Length = 1 << ((Bar & PCI_ADDRESS_IO_SPACE) ? 2 : 4);

    /* Keep going until a set bit */
    while (!(Length & Bar) && (Length)) Length <<= 1;

    /* Return the length (might be 0 on 64-bit because it's the low-word) */
    if ((Bar & PCI_ADDRESS_MEMORY_TYPE_MASK) != PCI_TYPE_64BIT) ASSERT(Length);
    return Length;
}

Referenced by PciCreateIoDescriptorFromBarLimit().

PciGetRegistryValue()

NTSTATUS NTAPI PciGetRegistryValue	(	IN PWCHAR	ValueName,
		IN PWCHAR	KeyName,
		IN HANDLE	RootHandle,
		IN ULONG	Type,
		OUT PVOID *	OutputBuffer,
		OUT PULONG	OutputLength
	)

Definition at line 192 of file utils.c.

{
    NTSTATUS Status;
    PKEY_VALUE_PARTIAL_INFORMATION PartialInfo;
    ULONG NeededLength, ActualLength;
    UNICODE_STRING ValueString;
    HANDLE KeyHandle;
    BOOLEAN Result;

    /* So we know what to free at the end of the body */
    PartialInfo = NULL;
    KeyHandle = NULL;
    do
    {
        /* Open the key by name, rooted off the handle passed */
        Result = PciOpenKey(KeyName,
                            RootHandle,
                            KEY_QUERY_VALUE,
                            &KeyHandle,
                            &Status);
        if (!Result) break;

        /* Query for the size that's needed for the value that was passed in */
        RtlInitUnicodeString(&ValueString, ValueName);
        Status = ZwQueryValueKey(KeyHandle,
                                 &ValueString,
                                 KeyValuePartialInformation,
                                 NULL,
                                 0,
                                 &NeededLength);
        ASSERT(!NT_SUCCESS(Status));
        if (Status != STATUS_BUFFER_TOO_SMALL) break;

        /* Allocate an appropriate buffer for the size that was returned */
        ASSERT(NeededLength != 0);
        Status = STATUS_INSUFFICIENT_RESOURCES;
        PartialInfo = ExAllocatePoolWithTag(PagedPool,
                                            NeededLength,
                                            PCI_POOL_TAG);
        if (!PartialInfo) break;

        /* Query the actual value information now that the size is known */
        Status = ZwQueryValueKey(KeyHandle,
                                 &ValueString,
                                 KeyValuePartialInformation,
                                 PartialInfo,
                                 NeededLength,
                                 &ActualLength);
        if (!NT_SUCCESS(Status)) break;

        /* Make sure it's of the type that the caller expects */
        Status = STATUS_INVALID_PARAMETER;
        if (PartialInfo->Type != Type) break;

        /* Subtract the registry-specific header, to get the data size */
        ASSERT(NeededLength == ActualLength);
        NeededLength -= sizeof(KEY_VALUE_PARTIAL_INFORMATION);

        /* Allocate a buffer to hold the data and return it to the caller */
        Status = STATUS_INSUFFICIENT_RESOURCES;
        *OutputBuffer = ExAllocatePoolWithTag(PagedPool,
                                              NeededLength,
                                              PCI_POOL_TAG);
        if (!*OutputBuffer) break;

        /* Copy the data into the buffer and return its length to the caller */
        RtlCopyMemory(*OutputBuffer, PartialInfo->Data, NeededLength);
        if (OutputLength) *OutputLength = NeededLength;
        Status = STATUS_SUCCESS;
    } while (0);

    /* Close any opened keys and free temporary allocations */
    if (KeyHandle) ZwClose(KeyHandle);
    if (PartialInfo) ExFreePoolWithTag(PartialInfo, 0);
    return Status;
}

Referenced by DriverEntry(), PciAcpiFindRsdt(), PciGetIrqRoutingTableFromRegistry(), and PciIsDatacenter().

PciInsertEntryAtHead()

VOID NTAPI PciInsertEntryAtHead	(	IN PSINGLE_LIST_ENTRY	ListHead,
		IN PSINGLE_LIST_ENTRY	Entry,
		IN PKEVENT	Lock
	)

Definition at line 430 of file utils.c.

{
    PAGED_CODE();

    /* Check if a lock was specified */
    if (Lock)
    {
        /* Wait for the lock to be released */
        KeEnterCriticalRegion();
        KeWaitForSingleObject(Lock, Executive, KernelMode, FALSE, NULL);
    }

    /* Make the entry point to the current head and make the head point to it */
    Entry->Next = ListHead->Next;
    ListHead->Next = Entry;

    /* Check if we had acquired a lock previously */
    if (Lock)
    {
        /* Release it */
        KeSetEvent(Lock, IO_NO_INCREMENT, FALSE);
        KeLeaveCriticalRegion();
    }
}

Referenced by PcipLinkSecondaryExtension().

PciInsertEntryAtTail()

VOID NTAPI PciInsertEntryAtTail	(	IN PSINGLE_LIST_ENTRY	ListHead,
		IN PPCI_FDO_EXTENSION	DeviceExtension,
		IN PKEVENT	Lock
	)

Definition at line 400 of file utils.c.

{
    PSINGLE_LIST_ENTRY NextEntry;
    PAGED_CODE();

    /* Check if a lock was specified */
    if (Lock)
    {
        /* Wait for the lock to be released */
        KeEnterCriticalRegion();
        KeWaitForSingleObject(Lock, Executive, KernelMode, FALSE, NULL);
    }

    /* Loop the list until we get to the end, then insert this entry there */
    for (NextEntry = ListHead; NextEntry->Next; NextEntry = NextEntry->Next);
    NextEntry->Next = &DeviceExtension->List;

    /* Check if we had acquired a lock previously */
    if (Lock)
    {
        /* Release it */
        KeSetEvent(Lock, IO_NO_INCREMENT, FALSE);
        KeLeaveCriticalRegion();
    }
}

Referenced by PciAddDevice(), and PciPdoCreate().

PciIsCriticalDeviceClass()

BOOLEAN NTAPI PciIsCriticalDeviceClass	(	IN UCHAR	BaseClass,
		IN UCHAR	SubClass
	)

Definition at line 672 of file utils.c.

{
    /* Check for system or bridge devices */
    if (BaseClass == PCI_CLASS_BASE_SYSTEM_DEV)
    {
        /* Interrupt controllers are critical */
        return SubClass == PCI_SUBCLASS_SYS_INTERRUPT_CTLR;
    }
    else if (BaseClass == PCI_CLASS_BRIDGE_DEV)
    {
        /* ISA Bridges are critical */
        return SubClass == PCI_SUBCLASS_BR_ISA;
    }
    else
    {
        /* All display controllers are critical */
        return BaseClass == PCI_CLASS_DISPLAY_CTLR;
    }
}

Referenced by PciScanBus().

PciIsDatacenter()

BOOLEAN NTAPI PciIsDatacenter

(

VOID

)

Definition at line 131 of file utils.c.

{
    BOOLEAN Result;
    PVOID Value;
    ULONG ResultLength;
    NTSTATUS Status;

    /* Assume this isn't Datacenter */
    Result = FALSE;

    /* First, try opening the setup key */
    Status = PciGetRegistryValue(L"",
                                 L"\\REGISTRY\\MACHINE\\SYSTEM\\CurrentControlSet\\Services\\setupdd",
                                 0,
                                 REG_BINARY,
                                 &Value,
                                 &ResultLength);
    if (!NT_SUCCESS(Status))
    {
        /* This is not an in-progress Setup boot, so query the suite version */
        Result = PciIsSuiteVersion(VER_SUITE_DATACENTER);
    }
    else
    {
        /* This scenario shouldn't happen yet, since SetupDD isn't used */
        UNIMPLEMENTED_FATAL("ReactOS doesn't use SetupDD for its installation program. Therefore this scenario must not happen!\n");
    }

    /* Return if this is Datacenter or not */
    return Result;
}

Referenced by DriverEntry().

PciIsDeviceOnDebugPath()

BOOLEAN NTAPI PciIsDeviceOnDebugPath

(

IN PPCI_PDO_EXTENSION

DeviceExtension

)

Definition at line 751 of file utils.c.

{
    PAGED_CODE();

    UNREFERENCED_PARAMETER(DeviceExtension);

    /* Check for too many, or no, debug ports */
    ASSERT(PciDebugPortsCount <= MAX_DEBUGGING_DEVICES_SUPPORTED);
    if (!PciDebugPortsCount) return FALSE;

    /* eVb has not been able to test such devices yet */
    UNIMPLEMENTED_DBGBREAK();
    return FALSE;
}

Referenced by PciScanBus().

PciIsSlotPresentInParentMethod()

BOOLEAN NTAPI PciIsSlotPresentInParentMethod	(	IN PPCI_PDO_EXTENSION	PdoExtension,
		IN ULONG	Method
	)

Definition at line 1094 of file utils.c.

{
    BOOLEAN FoundSlot;
    PACPI_METHOD_ARGUMENT Argument;
    ACPI_EVAL_INPUT_BUFFER InputBuffer;
    PACPI_EVAL_OUTPUT_BUFFER OutputBuffer;
    ULONG i, Length;
    NTSTATUS Status;
    PAGED_CODE();

    /* Assume slot is not part of the parent method */
    FoundSlot = FALSE;

    /* Allocate a 2KB buffer for the method return parameters */
    Length = sizeof(ACPI_EVAL_OUTPUT_BUFFER) + 2048;
    OutputBuffer = ExAllocatePoolWithTag(PagedPool, Length, 'BicP');
    if (OutputBuffer)
    {
        /* Clear out the output buffer */
        RtlZeroMemory(OutputBuffer, Length);

        /* Initialize the input buffer with the method requested */
        InputBuffer.Signature = 0;
        *(PULONG)InputBuffer.MethodName = Method;
        InputBuffer.Signature = ACPI_EVAL_INPUT_BUFFER_SIGNATURE;

        /* Send it to the ACPI driver */
        Status = PciSendIoctl(PdoExtension->ParentFdoExtension->PhysicalDeviceObject,
                              IOCTL_ACPI_EVAL_METHOD,
                              &InputBuffer,
                              sizeof(ACPI_EVAL_INPUT_BUFFER),
                              OutputBuffer,
                              Length);
        if (NT_SUCCESS(Status))
        {
            /* Scan all output arguments */
            for (i = 0; i < OutputBuffer->Count; i++)
            {
                /* Make sure it's an integer */
                Argument = &OutputBuffer->Argument[i];
                if (Argument->Type != ACPI_METHOD_ARGUMENT_INTEGER) continue;

                /* Check if the argument matches this PCI slot structure */
                if (Argument->Argument == ((PdoExtension->Slot.u.bits.DeviceNumber) |
                                           ((PdoExtension->Slot.u.bits.FunctionNumber) << 16)))
                {
                    /* This slot has been found, return it */
                    FoundSlot = TRUE;
                    break;
                }
            }
        }

        /* Finished with the buffer, free it */
        ExFreePoolWithTag(OutputBuffer, 0);
    }

    /* Return if the slot was found */
    return FoundSlot;
}

Referenced by PciApplyHacks(), and PciBridgeIsPositiveDecode().

PciIsSuiteVersion()

BOOLEAN NTAPI PciIsSuiteVersion

(

IN USHORT

SuiteMask

)

Definition at line 114 of file utils.c.

{
    ULONGLONG Mask = 0;
    RTL_OSVERSIONINFOEXW VersionInfo;

    /* Initialize the version information */
    RtlZeroMemory(&VersionInfo, sizeof(RTL_OSVERSIONINFOEXW));
    VersionInfo.dwOSVersionInfoSize = sizeof(RTL_OSVERSIONINFOEXW);
    VersionInfo.wSuiteMask = SuiteMask;

    /* Set the comparison mask and return if the passed suite mask matches */
    VER_SET_CONDITION(Mask, VER_SUITENAME, VER_AND);
    return NT_SUCCESS(RtlVerifyVersionInfo(&VersionInfo, VER_SUITENAME, Mask));
}

Referenced by PciIsDatacenter().

PciOpenKey()

BOOLEAN NTAPI PciOpenKey	(	IN PWCHAR	KeyName,
		IN HANDLE	RootKey,
		IN ACCESS_MASK	DesiredAccess,
		OUT PHANDLE	KeyHandle,
		OUT PNTSTATUS	KeyStatus
	)

Definition at line 165 of file utils.c.

{
    NTSTATUS Status;
    OBJECT_ATTRIBUTES ObjectAttributes;
    UNICODE_STRING KeyString;
    PAGED_CODE();

    /* Initialize the object attributes */
    RtlInitUnicodeString(&KeyString, KeyName);
    InitializeObjectAttributes(&ObjectAttributes,
                               &KeyString,
                               OBJ_CASE_INSENSITIVE,
                               RootKey,
                               NULL);

    /* Open the key, returning a boolean, and the status, if requested */
    Status = ZwOpenKey(KeyHandle, DesiredAccess, &ObjectAttributes);
    if (KeyStatus) *KeyStatus = Status;
    return NT_SUCCESS(Status);
}

Referenced by DriverEntry(), PciAcpiFindRsdt(), PciGetIrqRoutingTableFromRegistry(), and PciGetRegistryValue().

PcipLinkSecondaryExtension()

VOID NTAPI PcipLinkSecondaryExtension	(	IN PSINGLE_LIST_ENTRY	List,
		IN PVOID	Lock,
		IN PPCI_SECONDARY_EXTENSION	SecondaryExtension,
		IN PCI_SIGNATURE	ExtensionType,
		IN PVOID	Destructor
	)

Definition at line 459 of file utils.c.

{
    PAGED_CODE();

    /* Setup the extension data, and insert it into the primary's list */
    SecondaryExtension->ExtensionType = ExtensionType;
    SecondaryExtension->Destructor = Destructor;
    PciInsertEntryAtHead(List, &SecondaryExtension->List, Lock);
}

Referenced by PciInitializeArbiters().

PciQueryBusInformation()

NTSTATUS NTAPI PciQueryBusInformation	(	IN PPCI_PDO_EXTENSION	PdoExtension,
		IN PPNP_BUS_INFORMATION *	Buffer
	)

Definition at line 1316 of file utils.c.

{
    PPNP_BUS_INFORMATION BusInfo;

    UNREFERENCED_PARAMETER(Buffer);

    /* Allocate a structure for the bus information */
    BusInfo = ExAllocatePoolWithTag(PagedPool,
                                    sizeof(PNP_BUS_INFORMATION),
                                    'BicP');
    if (!BusInfo) return STATUS_INSUFFICIENT_RESOURCES;

    /* Write the correct GUID and bus type identifier, and fill the bus number */
    BusInfo->BusTypeGuid = GUID_BUS_TYPE_PCI;
    BusInfo->LegacyBusType = PCIBus;
    BusInfo->BusNumber = PdoExtension->ParentFdoExtension->BaseBus;
    return STATUS_SUCCESS;
}

Referenced by PciPdoIrpQueryBusInformation().

PciQueryCapabilities()

NTSTATUS NTAPI PciQueryCapabilities	(	IN PPCI_PDO_EXTENSION	PdoExtension,
		IN OUT PDEVICE_CAPABILITIES	DeviceCapability
	)

Definition at line 1727 of file utils.c.

{
    NTSTATUS Status;

    /* A PDO ID is never unique, and its address is its function and device */
    DeviceCapability->UniqueID = FALSE;
    DeviceCapability->Address = PdoExtension->Slot.u.bits.FunctionNumber |
                                (PdoExtension->Slot.u.bits.DeviceNumber << 16);

    /* Check for host bridges */
    if ((PdoExtension->BaseClass == PCI_CLASS_BRIDGE_DEV) &&
        (PdoExtension->SubClass == PCI_SUBCLASS_BR_HOST))
    {
        /* Raw device opens to a host bridge are acceptable */
        DeviceCapability->RawDeviceOK = TRUE;
    }
    else
    {
        /* Otherwise, other PDOs cannot be directly opened */
        DeviceCapability->RawDeviceOK = FALSE;
    }

    /* PCI PDOs are pretty fixed things */
    DeviceCapability->LockSupported = FALSE;
    DeviceCapability->EjectSupported = FALSE;
    DeviceCapability->Removable = FALSE;
    DeviceCapability->DockDevice = FALSE;

    /* The slot number is stored as a device property, go query it */
    PciDetermineSlotNumber(PdoExtension, &DeviceCapability->UINumber);

    /* Finally, query and power capabilities and convert them for PnP usage */
    Status = PciQueryPowerCapabilities(PdoExtension, DeviceCapability);

    /* Dump the capabilities if it all worked, and return the status */
    if (NT_SUCCESS(Status)) PciDebugDumpQueryCapabilities(DeviceCapability);
    return Status;
}

Referenced by PciPdoIrpQueryCapabilities().

PciQueryPowerCapabilities()

NTSTATUS NTAPI PciQueryPowerCapabilities	(	IN PPCI_PDO_EXTENSION	PdoExtension,
		IN PDEVICE_CAPABILITIES	DeviceCapability
	)

Definition at line 1477 of file utils.c.

{
    PDEVICE_OBJECT DeviceObject;
    NTSTATUS Status;
    DEVICE_CAPABILITIES AttachedCaps;
    DEVICE_POWER_STATE NewPowerState, DevicePowerState, DeviceWakeLevel, DeviceWakeState;
    SYSTEM_POWER_STATE SystemWakeState, DeepestWakeState, CurrentState;

    /* Nothing is known at first */
    DeviceWakeState = PowerDeviceUnspecified;
    SystemWakeState = DeepestWakeState = PowerSystemUnspecified;

    /* Get the PCI capabilities for the parent PDO */
    DeviceObject = PdoExtension->ParentFdoExtension->PhysicalDeviceObject;
    Status = PciGetDeviceCapabilities(DeviceObject, &AttachedCaps);
    ASSERT(NT_SUCCESS(Status));
    if (!NT_SUCCESS(Status)) return Status;

    /* Check if there's not an existing device state for S0 */
    if (!AttachedCaps.DeviceState[PowerSystemWorking])
    {
        /* Set D0<->S0 mapping */
        AttachedCaps.DeviceState[PowerSystemWorking] = PowerDeviceD0;
    }

    /* Check if there's not an existing device state for S3 */
    if (!AttachedCaps.DeviceState[PowerSystemShutdown])
    {
        /* Set D3<->S3 mapping */
        AttachedCaps.DeviceState[PowerSystemShutdown] = PowerDeviceD3;
    }

    /* Check for a PDO with broken, or no, power capabilities */
    if (PdoExtension->HackFlags & PCI_HACK_NO_PM_CAPS)
    {
        /* Unknown wake device states */
        DeviceCapability->DeviceWake = PowerDeviceUnspecified;
        DeviceCapability->SystemWake = PowerSystemUnspecified;

        /* No device state support */
        DeviceCapability->DeviceD1 = FALSE;
        DeviceCapability->DeviceD2 = FALSE;

        /* No waking from any low-power device state is supported */
        DeviceCapability->WakeFromD0 = FALSE;
        DeviceCapability->WakeFromD1 = FALSE;
        DeviceCapability->WakeFromD2 = FALSE;
        DeviceCapability->WakeFromD3 = FALSE;

        /* For the rest, copy whatever the parent PDO had */
        RtlCopyMemory(DeviceCapability->DeviceState,
                      AttachedCaps.DeviceState,
                      sizeof(DeviceCapability->DeviceState));
        return STATUS_SUCCESS;
    }

    /* The PCI Device has power capabilities, so read which ones are supported */
    DeviceCapability->DeviceD1 = PdoExtension->PowerCapabilities.Support.D1;
    DeviceCapability->DeviceD2 = PdoExtension->PowerCapabilities.Support.D2;
    DeviceCapability->WakeFromD0 = PdoExtension->PowerCapabilities.Support.PMED0;
    DeviceCapability->WakeFromD1 = PdoExtension->PowerCapabilities.Support.PMED1;
    DeviceCapability->WakeFromD2 = PdoExtension->PowerCapabilities.Support.PMED2;

    /* Can the attached device wake from D3? */
    if (AttachedCaps.DeviceWake != PowerDeviceD3)
    {
        /* It can't, so check if this PDO supports hot D3 wake */
        DeviceCapability->WakeFromD3 = PdoExtension->PowerCapabilities.Support.PMED3Hot;
    }
    else
    {
        /* It can, is this the root bus? */
        if (PCI_IS_ROOT_FDO(PdoExtension->ParentFdoExtension))
        {
            /* This is the root bus, so just check if it supports hot D3 wake */
            DeviceCapability->WakeFromD3 = PdoExtension->PowerCapabilities.Support.PMED3Hot;
        }
        else
        {
            /* Take the minimums? -- need to check with briang at work */
            UNIMPLEMENTED;
        }
    }

    /* Now loop each system power state to determine its device state mapping */
    for (CurrentState = PowerSystemWorking;
         CurrentState < PowerSystemMaximum;
         CurrentState++)
    {
        /* Read the current mapping from the attached device */
        DevicePowerState = AttachedCaps.DeviceState[CurrentState];
        NewPowerState = DevicePowerState;

        /* The attachee supports D1, but this PDO does not */
        if ((NewPowerState == PowerDeviceD1) &&
            !(PdoExtension->PowerCapabilities.Support.D1))
        {
            /* Fall back to D2 */
            NewPowerState = PowerDeviceD2;
        }

        /* The attachee supports D2, but this PDO does not */
        if ((NewPowerState == PowerDeviceD2) &&
            !(PdoExtension->PowerCapabilities.Support.D2))
        {
            /* Fall back to D3 */
            NewPowerState = PowerDeviceD3;
        }

        /* Set the mapping based on the best state supported */
        DeviceCapability->DeviceState[CurrentState] = NewPowerState;

        /* Check if sleep states are being processed, and a mapping was found */
        if ((CurrentState < PowerSystemHibernate) &&
            (NewPowerState != PowerDeviceUnspecified))
        {
            /* Save this state as being the deepest one found until now */
            DeepestWakeState = CurrentState;
        }

        /*
         * Finally, check if the computed sleep state is within the states that
         * this device can wake the system from, and if it's higher or equal to
         * the sleep state mapping that came from the attachee, assuming that it
         * had a valid mapping to begin with.
         *
         * It this is the case, then make sure that the computed sleep state is
         * matched by the device's ability to actually wake from that state.
         *
         * For devices that support D3, the PCI device only needs Hot D3 as long
         * as the attachee's state is less than D3. Otherwise, if the attachee
         * might also be at D3, this would require a Cold D3 wake, so check that
         * the device actually support this.
         */
        if ((CurrentState < AttachedCaps.SystemWake) &&
            (NewPowerState >= DevicePowerState) &&
            (DevicePowerState != PowerDeviceUnspecified) &&
            (((NewPowerState == PowerDeviceD0) && (DeviceCapability->WakeFromD0)) ||
             ((NewPowerState == PowerDeviceD1) && (DeviceCapability->WakeFromD1)) ||
             ((NewPowerState == PowerDeviceD2) && (DeviceCapability->WakeFromD2)) ||
             ((NewPowerState == PowerDeviceD3) &&
              (PdoExtension->PowerCapabilities.Support.PMED3Hot) &&
              ((DevicePowerState < PowerDeviceD3) ||
               (PdoExtension->PowerCapabilities.Support.PMED3Cold)))))
        {
            /* The mapping is valid, so this will be the lowest wake state */
            SystemWakeState = CurrentState;
            DeviceWakeState = NewPowerState;
        }
    }

    /* Read the current wake level */
    DeviceWakeLevel = PdoExtension->PowerState.DeviceWakeLevel;

    /* Check if the attachee's wake levels are valid, and the PDO's is higher */
    if ((AttachedCaps.SystemWake != PowerSystemUnspecified) &&
        (AttachedCaps.DeviceWake != PowerDeviceUnspecified) &&
        (DeviceWakeLevel != PowerDeviceUnspecified) &&
        (DeviceWakeLevel >= AttachedCaps.DeviceWake))
    {
        /* Inherit the system wake from the attachee, and this PDO's wake level */
        DeviceCapability->SystemWake = AttachedCaps.SystemWake;
        DeviceCapability->DeviceWake = DeviceWakeLevel;

        /* Now check if the wake level is D0, but the PDO doesn't support it */
        if ((DeviceCapability->DeviceWake == PowerDeviceD0) &&
            !(DeviceCapability->WakeFromD0))
        {
            /* Bump to D1 */
            DeviceCapability->DeviceWake = PowerDeviceD1;
        }

        /* Now check if the wake level is D1, but the PDO doesn't support it */
        if ((DeviceCapability->DeviceWake == PowerDeviceD1) &&
            !(DeviceCapability->WakeFromD1))
        {
            /* Bump to D2 */
            DeviceCapability->DeviceWake = PowerDeviceD2;
        }

        /* Now check if the wake level is D2, but the PDO doesn't support it */
        if ((DeviceCapability->DeviceWake == PowerDeviceD2) &&
            !(DeviceCapability->WakeFromD2))
        {
            /* Bump it to D3 */
            DeviceCapability->DeviceWake = PowerDeviceD3;
        }

        /* Now check if the wake level is D3, but the PDO doesn't support it */
        if ((DeviceCapability->DeviceWake == PowerDeviceD3) &&
            !(DeviceCapability->WakeFromD3))
        {
            /* Then no valid wake state exists */
            DeviceCapability->DeviceWake = PowerDeviceUnspecified;
            DeviceCapability->SystemWake = PowerSystemUnspecified;
        }

        /* Check if no valid wake state was found */
        if ((DeviceCapability->DeviceWake == PowerDeviceUnspecified) ||
            (DeviceCapability->SystemWake == PowerSystemUnspecified))
        {
            /* Check if one was computed earlier */
            if ((SystemWakeState != PowerSystemUnspecified) &&
                (DeviceWakeState != PowerDeviceUnspecified))
            {
                /* Use the wake state that had been computed earlier */
                DeviceCapability->DeviceWake = DeviceWakeState;
                DeviceCapability->SystemWake = SystemWakeState;

                /* If that state was D3, then the device supports Hot/Cold D3 */
                if (DeviceWakeState == PowerDeviceD3) DeviceCapability->WakeFromD3 = TRUE;
            }
        }

        /*
         * Finally, check for off states (lower than S3, such as hibernate) and
         * make sure that the device both supports waking from D3 as well as
         * supports a Cold wake
         */
        if ((DeviceCapability->SystemWake > PowerSystemSleeping3) &&
            ((DeviceCapability->DeviceWake != PowerDeviceD3) ||
             !(PdoExtension->PowerCapabilities.Support.PMED3Cold)))
        {
            /* It doesn't, so pick the computed lowest wake state from earlier */
            DeviceCapability->SystemWake = DeepestWakeState;
        }

        /* Set the PCI Specification mandated maximum latencies for transitions */
        DeviceCapability->D1Latency = 0;
        DeviceCapability->D2Latency = 2;
        DeviceCapability->D3Latency = 100;

        /* Sanity check */
        ASSERT(DeviceCapability->DeviceState[PowerSystemWorking] == PowerDeviceD0);
    }
    else
    {
        /* No valid sleep states, no latencies to worry about */
        DeviceCapability->D1Latency = 0;
        DeviceCapability->D2Latency = 0;
        DeviceCapability->D3Latency = 0;
    }

    /* This function always succeeds, even without power management support */
    return STATUS_SUCCESS;
}

Referenced by PciQueryCapabilities().

PciReadDeviceCapability()

UCHAR NTAPI PciReadDeviceCapability	(	IN PPCI_PDO_EXTENSION	DeviceExtension,
		IN UCHAR	Offset,
		IN ULONG	CapabilityId,
		OUT PPCI_CAPABILITIES_HEADER	Buffer,
		IN ULONG	Length
	)

Definition at line 886 of file utils.c.

{
    ULONG CapabilityCount = 0;

    /* If the device has no capabilility list, fail */
    if (!Offset) return 0;

    /* Validate a PDO with capabilities, a valid buffer, and a valid length */
    ASSERT(DeviceExtension->ExtensionType == PciPdoExtensionType);
    ASSERT(DeviceExtension->CapabilitiesPtr != 0);
    ASSERT(Buffer);
    ASSERT(Length >= sizeof(PCI_CAPABILITIES_HEADER));

    /* Loop all capabilities */
    while (Offset)
    {
        /* Make sure the pointer is spec-aligned and spec-sized */
        ASSERT((Offset >= PCI_COMMON_HDR_LENGTH) && ((Offset & 0x3) == 0));

        /* Read the capability header */
        PciReadDeviceConfig(DeviceExtension,
                            Buffer,
                            Offset,
                            sizeof(PCI_CAPABILITIES_HEADER));

        /* Check if this is the capability being looked up */
        if ((Buffer->CapabilityID == CapabilityId) || !(CapabilityId))
        {
            /* Check if was at a valid offset and length */
            if ((Offset) && (Length > sizeof(PCI_CAPABILITIES_HEADER)))
            {
                /* Sanity check */
                ASSERT(Length <= (sizeof(PCI_COMMON_CONFIG) - Offset));

                /* Now read the whole capability data into the buffer */
                PciReadDeviceConfig(DeviceExtension,
                                    (PVOID)((ULONG_PTR)Buffer +
                                    sizeof(PCI_CAPABILITIES_HEADER)),
                                    Offset + sizeof(PCI_CAPABILITIES_HEADER),
                                    Length - sizeof(PCI_CAPABILITIES_HEADER));
            }

            /* Return the offset where the capability was found */
            return Offset;
        }

        /* Try the next capability instead */
        CapabilityCount++;
        Offset = Buffer->Next;

        /* There can't be more than 48 capabilities (256 bytes max) */
        if (CapabilityCount > 48)
        {
            /* Fail, since this is basically a broken PCI device */
            DPRINT1("PCI device %p capabilities list is broken.\n", DeviceExtension);
            return 0;
        }
    }

    /* Capability wasn't found, fail */
    return 0;
}

Referenced by PciGetEnhancedCapabilities(), PciScanBus(), and PciSetPowerManagedDevicePowerState().

PciSaveBiosConfig()

NTSTATUS NTAPI PciSaveBiosConfig	(	IN PPCI_PDO_EXTENSION	DeviceExtension,
		IN PPCI_COMMON_HEADER	PciData
	)

Definition at line 831 of file utils.c.

{
    HANDLE KeyHandle, SubKeyHandle;
    OBJECT_ATTRIBUTES ObjectAttributes;
    UNICODE_STRING KeyName, KeyValue;
    WCHAR Buffer[32];
    NTSTATUS Status;
    PAGED_CODE();

    /* Open the PCI key */
    Status = IoOpenDeviceRegistryKey(DeviceExtension->ParentFdoExtension->
                                     PhysicalDeviceObject,
                                     TRUE,
                                     KEY_READ | KEY_WRITE,
                                     &KeyHandle);
    if (!NT_SUCCESS(Status)) return Status;

    /* Create a volatile BIOS configuration key */
    RtlInitUnicodeString(&KeyName, L"BiosConfig");
    InitializeObjectAttributes(&ObjectAttributes,
                               &KeyName,
                               OBJ_KERNEL_HANDLE,
                               KeyHandle,
                               NULL);
    Status = ZwCreateKey(&SubKeyHandle,
                         KEY_READ | KEY_WRITE,
                         &ObjectAttributes,
                         0,
                         NULL,
                         REG_OPTION_VOLATILE,
                         NULL);
    ZwClose(KeyHandle);
    if (!NT_SUCCESS(Status)) return Status;

    /* Create the key value based on the device and function number */
    swprintf(Buffer,
             L"DEV_%02x&FUN_%02x",
             DeviceExtension->Slot.u.bits.DeviceNumber,
             DeviceExtension->Slot.u.bits.FunctionNumber);
    RtlInitUnicodeString(&KeyValue, Buffer);

    /* Set the value data (the PCI BIOS configuration header) */
    Status = ZwSetValueKey(SubKeyHandle,
                           &KeyValue,
                           0,
                           REG_BINARY,
                           PciData,
                           PCI_COMMON_HDR_LENGTH);
    ZwClose(SubKeyHandle);
    return Status;
}

PciSendIoctl()

NTSTATUS NTAPI PciSendIoctl	(	IN PDEVICE_OBJECT	DeviceObject,
		IN ULONG	IoControlCode,
		IN PVOID	InputBuffer,
		IN ULONG	InputBufferLength,
		IN PVOID	OutputBuffer,
		IN ULONG	OutputBufferLength
	)

Definition at line 531 of file utils.c.

{
    PIRP Irp;
    NTSTATUS Status;
    KEVENT Event;
    IO_STATUS_BLOCK IoStatusBlock;
    PDEVICE_OBJECT AttachedDevice;
    PAGED_CODE();

    /* Initialize the pending IRP event */
    KeInitializeEvent(&Event, SynchronizationEvent, FALSE);

    /* Get a reference to the root PDO (ACPI) */
    AttachedDevice = IoGetAttachedDeviceReference(DeviceObject);
    if (!AttachedDevice) return STATUS_INVALID_PARAMETER;

    /* Build the requested IOCTL IRP */
    Irp = IoBuildDeviceIoControlRequest(IoControlCode,
                                        AttachedDevice,
                                        InputBuffer,
                                        InputBufferLength,
                                        OutputBuffer,
                                        OutputBufferLength,
                                        0,
                                        &Event,
                                        &IoStatusBlock);
    if (!Irp) return STATUS_INSUFFICIENT_RESOURCES;

    /* Send the IOCTL to the driver */
    Status = IoCallDriver(AttachedDevice, Irp);
    if (Status == STATUS_PENDING)
    {
        /* Wait for a response */
        KeWaitForSingleObject(&Event,
                              Executive,
                              KernelMode,
                              FALSE,
                              NULL);
        Status = Irp->IoStatus.Status;
    }

    /* Take away the reference we took and return the result to the caller */
    ObDereferenceObject(AttachedDevice);
    return Status;
}

Referenced by PciGetHotPlugParameters(), and PciIsSlotPresentInParentMethod().

PciStringToUSHORT()

BOOLEAN NTAPI PciStringToUSHORT	(	IN PWCHAR	String,
		OUT PUSHORT	Value
	)

Definition at line 61 of file utils.c.

{
    USHORT Short;
    ULONG Low, High, Length;
    WCHAR Char;

    /* Initialize everything to zero */
    Short = 0;
    Length = 0;
    while (TRUE)
    {
        /* Get the character and set the high byte based on the previous one */
        Char = *String++;
        High = 16 * Short;

        /* Check for numbers */
        if ( Char >= '0' && Char <= '9' )
        {
            /* Convert them to a byte */
            Low = Char - '0';
        }
        else if ( Char >= 'A' && Char <= 'F' )
        {
            /* Convert upper-case hex letters into a byte */
            Low = Char - '7';
        }
        else if ( Char >= 'a' && Char <= 'f' )
        {
            /* Convert lower-case hex letters into a byte */
            Low = Char - 'W';
        }
        else
        {
            /* Invalid string, fail the conversion */
            return FALSE;
        }

        /* Combine the high and low byte */
        Short = High | Low;

        /* If 4 letters have been reached, the 16-bit integer should exist */
        if (++Length >= 4)
        {
            /* Return it to the caller */
            *Value = Short;
            return TRUE;
        }
    }
}

Referenced by PciBuildHackTable().

PciUnicodeStringStrStr()

BOOLEAN NTAPI PciUnicodeStringStrStr	(	IN PUNICODE_STRING	InputString,
		IN PCUNICODE_STRING	EqualString,
		IN BOOLEAN	CaseInSensitive
	)

Definition at line 27 of file utils.c.

{
    UNICODE_STRING PartialString;
    LONG EqualChars, TotalChars;

    /* Build a partial string with the smaller substring */
    PartialString.Length = EqualString->Length;
    PartialString.MaximumLength = InputString->MaximumLength;
    PartialString.Buffer = InputString->Buffer;

    /* Check how many characters that need comparing */
    EqualChars = 0;
    TotalChars = (InputString->Length - EqualString->Length) / sizeof(WCHAR);

    /* If the substring is bigger, just fail immediately */
    if (TotalChars < 0) return FALSE;

    /* Keep checking each character */
    while (!RtlEqualUnicodeString(EqualString, &PartialString, CaseInSensitive))
    {
        /* Continue checking until all the required characters are equal */
        PartialString.Buffer++;
        PartialString.MaximumLength -= sizeof(WCHAR);
        if (++EqualChars > TotalChars) return FALSE;
    }

    /* The string is equal */
    return TRUE;
}

Referenced by DriverEntry().

Variable Documentation

PciDebugPortsCount

ULONG PciDebugPortsCount

Definition at line 18 of file utils.c.

Referenced by PciIsDeviceOnDebugPath().

PciIsaBitExclusionList

RTL_RANGE_LIST PciIsaBitExclusionList

Definition at line 20 of file utils.c.

Referenced by PciBuildDefaultExclusionLists().

PciVgaAndIsaBitExclusionList

RTL_RANGE_LIST PciVgaAndIsaBitExclusionList

Definition at line 21 of file utils.c.

Referenced by PciBuildDefaultExclusionLists().