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reactos/drivers/bus/pcix/init.c
Serge Gautherie abe8f0ab1d [PCIX] Add 2 OBJ_KERNEL_HANDLE 
Match Zw*() uses.

CORE-10207
2022-05-07 16:23:42 +02:00

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/*
* PROJECT: ReactOS PCI Bus Driver
* LICENSE: BSD - See COPYING.ARM in the top level directory
* FILE: drivers/bus/pci/init.c
* PURPOSE: Driver Initialization
* PROGRAMMERS: ReactOS Portable Systems Group
*/
/* INCLUDES *******************************************************************/
#include <pci.h>
#define NDEBUG
#include <debug.h>
/* GLOBALS ********************************************************************/
BOOLEAN PciRunningDatacenter;
PDRIVER_OBJECT PciDriverObject;
KEVENT PciGlobalLock;
KEVENT PciBusLock;
KEVENT PciLegacyDescriptionLock;
BOOLEAN PciLockDeviceResources;
BOOLEAN PciEnableNativeModeATA;
ULONG PciSystemWideHackFlags;
PPCI_IRQ_ROUTING_TABLE PciIrqRoutingTable;
PWATCHDOG_TABLE WdTable;
PPCI_HACK_ENTRY PciHackTable;
/* FUNCTIONS ******************************************************************/
NTSTATUS
NTAPI
PciAcpiFindRsdt(OUT PACPI_BIOS_MULTI_NODE *AcpiMultiNode)
{
BOOLEAN Result;
NTSTATUS Status;
HANDLE KeyHandle, SubKey;
ULONG NumberOfBytes, i, Length;
PKEY_FULL_INFORMATION FullInfo;
PKEY_BASIC_INFORMATION KeyInfo;
PKEY_VALUE_PARTIAL_INFORMATION ValueInfo;
PACPI_BIOS_MULTI_NODE NodeData;
UNICODE_STRING ValueName;
struct
{
CM_FULL_RESOURCE_DESCRIPTOR Descriptor;
ACPI_BIOS_MULTI_NODE Node;
} *Package;
/* So we know what to free at the end of the body */
ValueInfo = NULL;
KeyInfo = NULL;
KeyHandle = NULL;
FullInfo = NULL;
Package = NULL;
do
{
/* Open the ACPI BIOS key */
Result = PciOpenKey(L"\\Registry\\Machine\\HARDWARE\\DESCRIPTION\\"
L"System\\MultiFunctionAdapter",
NULL,
KEY_QUERY_VALUE,
&KeyHandle,
&Status);
if (!Result) break;
/* Query how much space should be allocated for the key information */
Status = ZwQueryKey(KeyHandle,
KeyFullInformation,
NULL,
sizeof(ULONG),
&NumberOfBytes);
if (Status != STATUS_BUFFER_TOO_SMALL) break;
/* Allocate the space required */
Status = STATUS_INSUFFICIENT_RESOURCES;
FullInfo = ExAllocatePoolWithTag(PagedPool, NumberOfBytes, PCI_POOL_TAG);
if ( !FullInfo ) break;
/* Now query the key information that's needed */
Status = ZwQueryKey(KeyHandle,
KeyFullInformation,
FullInfo,
NumberOfBytes,
&NumberOfBytes);
if (!NT_SUCCESS(Status)) break;
/* Allocate enough space to hold the value information plus the name */
Status = STATUS_INSUFFICIENT_RESOURCES;
Length = FullInfo->MaxNameLen + 26;
KeyInfo = ExAllocatePoolWithTag(PagedPool, Length, PCI_POOL_TAG);
if ( !KeyInfo ) break;
/* Allocate the value information and name we expect to find */
ValueInfo = ExAllocatePoolWithTag(PagedPool,
sizeof(KEY_VALUE_PARTIAL_INFORMATION) +
sizeof(L"ACPI BIOS"),
PCI_POOL_TAG);
if (!ValueInfo) break;
/* Loop each sub-key */
i = 0;
while (TRUE)
{
/* Query each sub-key */
Status = ZwEnumerateKey(KeyHandle,
i++,
KeyBasicInformation,
KeyInfo,
Length,
&NumberOfBytes);
if (Status == STATUS_NO_MORE_ENTRIES) break;
/* Null-terminate the keyname, because the kernel does not */
KeyInfo->Name[KeyInfo->NameLength / sizeof(WCHAR)] = UNICODE_NULL;
/* Open this subkey */
Result = PciOpenKey(KeyInfo->Name,
KeyHandle,
KEY_QUERY_VALUE,
&SubKey,
&Status);
if (Result)
{
/* Query the identifier value for this subkey */
RtlInitUnicodeString(&ValueName, L"Identifier");
Status = ZwQueryValueKey(SubKey,
&ValueName,
KeyValuePartialInformation,
ValueInfo,
sizeof(KEY_VALUE_PARTIAL_INFORMATION) +
sizeof(L"ACPI BIOS"),
&NumberOfBytes);
if (NT_SUCCESS(Status))
{
/* Check if this is the PCI BIOS subkey */
if (!wcsncmp((PWCHAR)ValueInfo->Data,
L"ACPI BIOS",
ValueInfo->DataLength))
{
/* It is, proceed to query the PCI IRQ routing table */
Status = PciGetRegistryValue(L"Configuration Data",
KeyInfo->Name,
KeyHandle,
REG_FULL_RESOURCE_DESCRIPTOR,
(PVOID*)&Package,
&NumberOfBytes);
ZwClose(SubKey);
break;
}
}
/* Close the subkey and try the next one */
ZwClose(SubKey);
}
}
/* Check if we got here because the routing table was found */
if (!NT_SUCCESS(Status))
{
/* This should only fail if we're out of entries */
ASSERT(Status == STATUS_NO_MORE_ENTRIES);
break;
}
/* Check if a descriptor was found */
if (!Package) break;
/* The configuration data is a resource list, and the BIOS node follows */
NodeData = &Package->Node;
/* How many E820 memory entries are there? */
Length = sizeof(ACPI_BIOS_MULTI_NODE) +
(NodeData->Count - 1) * sizeof(ACPI_E820_ENTRY);
/* Allocate the buffer needed to copy the information */
Status = STATUS_INSUFFICIENT_RESOURCES;
*AcpiMultiNode = ExAllocatePoolWithTag(NonPagedPool, Length, PCI_POOL_TAG);
if (!*AcpiMultiNode) break;
/* Copy the data */
RtlCopyMemory(*AcpiMultiNode, NodeData, Length);
Status = STATUS_SUCCESS;
} while (FALSE);
/* Close any opened keys, free temporary allocations, and return status */
if (Package) ExFreePoolWithTag(Package, 0);
if (ValueInfo) ExFreePoolWithTag(ValueInfo, 0);
if (KeyInfo) ExFreePoolWithTag(KeyInfo, 0);
if (FullInfo) ExFreePoolWithTag(FullInfo, 0);
if (KeyHandle) ZwClose(KeyHandle);
return Status;
}
PVOID
NTAPI
PciGetAcpiTable(IN ULONG TableCode)
{
PDESCRIPTION_HEADER Header;
PACPI_BIOS_MULTI_NODE AcpiMultiNode;
PRSDT Rsdt;
PXSDT Xsdt;
ULONG EntryCount, TableLength, Offset, CurrentEntry;
PVOID TableBuffer, MappedAddress;
PHYSICAL_ADDRESS PhysicalAddress;
NTSTATUS Status;
/* Try to find the RSDT or XSDT */
Status = PciAcpiFindRsdt(&AcpiMultiNode);
if (!NT_SUCCESS(Status))
{
/* No ACPI on the machine */
DPRINT1("AcpiFindRsdt() Failed!\n");
return NULL;
}
/* Map the RSDT with the minimum size allowed */
MappedAddress = MmMapIoSpace(AcpiMultiNode->RsdtAddress,
sizeof(DESCRIPTION_HEADER),
MmNonCached);
Header = MappedAddress;
if (!Header) return NULL;
/* Check how big the table really is and get rid of the temporary header */
TableLength = Header->Length;
MmUnmapIoSpace(Header, sizeof(DESCRIPTION_HEADER));
Header = NULL;
/* Map its true size */
MappedAddress = MmMapIoSpace(AcpiMultiNode->RsdtAddress,
TableLength,
MmNonCached);
Rsdt = MappedAddress;
Xsdt = MappedAddress;
ExFreePoolWithTag(AcpiMultiNode, 0);
if (!Rsdt) return NULL;
/* Validate the table's signature */
if ((Rsdt->Header.Signature != RSDT_SIGNATURE) &&
(Rsdt->Header.Signature != XSDT_SIGNATURE))
{
/* Very bad: crash */
HalDisplayString("RSDT table contains invalid signature\r\n");
MmUnmapIoSpace(Rsdt, TableLength);
return NULL;
}
/* Smallest RSDT/XSDT is one without table entries */
Offset = FIELD_OFFSET(RSDT, Tables);
if (Rsdt->Header.Signature == XSDT_SIGNATURE)
{
/* Figure out total size of table and the offset */
TableLength = Xsdt->Header.Length;
if (TableLength < Offset) Offset = Xsdt->Header.Length;
/* The entries are each 64-bits, so count them */
EntryCount = (TableLength - Offset) / sizeof(PHYSICAL_ADDRESS);
}
else
{
/* Figure out total size of table and the offset */
TableLength = Rsdt->Header.Length;
if (TableLength < Offset) Offset = Rsdt->Header.Length;
/* The entries are each 32-bits, so count them */
EntryCount = (TableLength - Offset) / sizeof(ULONG);
}
/* Start at the beginning of the array and loop it */
for (CurrentEntry = 0; CurrentEntry < EntryCount; CurrentEntry++)
{
/* Are we using the XSDT? */
if (Rsdt->Header.Signature != XSDT_SIGNATURE)
{
/* Read the 32-bit physical address */
PhysicalAddress.QuadPart = Rsdt->Tables[CurrentEntry];
}
else
{
/* Read the 64-bit physical address */
PhysicalAddress = Xsdt->Tables[CurrentEntry];
}
/* Map this table */
Header = MmMapIoSpace(PhysicalAddress,
sizeof(DESCRIPTION_HEADER),
MmNonCached);
if (!Header) break;
/* Check if this is the table that's being asked for */
if (Header->Signature == TableCode)
{
/* Allocate a buffer for it */
TableBuffer = ExAllocatePoolWithTag(PagedPool,
Header->Length,
PCI_POOL_TAG);
if (!TableBuffer) break;
/* Copy the table into the buffer */
RtlCopyMemory(TableBuffer, Header, Header->Length);
}
/* Done with this table, keep going */
MmUnmapIoSpace(Header, sizeof(DESCRIPTION_HEADER));
}
if (Header) MmUnmapIoSpace(Header, sizeof(DESCRIPTION_HEADER));
return NULL;
}
NTSTATUS
NTAPI
PciGetIrqRoutingTableFromRegistry(OUT PPCI_IRQ_ROUTING_TABLE *PciRoutingTable)
{
BOOLEAN Result;
NTSTATUS Status;
HANDLE KeyHandle, SubKey;
ULONG NumberOfBytes, i, Length;
PKEY_FULL_INFORMATION FullInfo;
PKEY_BASIC_INFORMATION KeyInfo;
PKEY_VALUE_PARTIAL_INFORMATION ValueInfo;
UNICODE_STRING ValueName;
struct
{
CM_FULL_RESOURCE_DESCRIPTOR Descriptor;
PCI_IRQ_ROUTING_TABLE Table;
} *Package;
/* So we know what to free at the end of the body */
Package = NULL;
ValueInfo = NULL;
KeyInfo = NULL;
KeyHandle = NULL;
FullInfo = NULL;
do
{
/* Open the BIOS key */
Result = PciOpenKey(L"\\Registry\\Machine\\HARDWARE\\DESCRIPTION\\"
L"System\\MultiFunctionAdapter",
NULL,
KEY_QUERY_VALUE,
&KeyHandle,
&Status);
if (!Result) break;
/* Query how much space should be allocated for the key information */
Status = ZwQueryKey(KeyHandle,
KeyFullInformation,
NULL,
sizeof(ULONG),
&NumberOfBytes);
if (Status != STATUS_BUFFER_TOO_SMALL) break;
/* Allocate the space required */
Status = STATUS_INSUFFICIENT_RESOURCES;
FullInfo = ExAllocatePoolWithTag(PagedPool, NumberOfBytes, PCI_POOL_TAG);
if ( !FullInfo ) break;
/* Now query the key information that's needed */
Status = ZwQueryKey(KeyHandle,
KeyFullInformation,
FullInfo,
NumberOfBytes,
&NumberOfBytes);
if (!NT_SUCCESS(Status)) break;
/* Allocate enough space to hold the value information plus the name */
Status = STATUS_INSUFFICIENT_RESOURCES;
Length = FullInfo->MaxNameLen + 26;
KeyInfo = ExAllocatePoolWithTag(PagedPool, Length, PCI_POOL_TAG);
if (!KeyInfo) break;
/* Allocate the value information and name we expect to find */
ValueInfo = ExAllocatePoolWithTag(PagedPool,
sizeof(KEY_VALUE_PARTIAL_INFORMATION) +
sizeof(L"PCI BIOS"),
PCI_POOL_TAG);
if (!ValueInfo) break;
/* Loop each sub-key */
i = 0;
while (TRUE)
{
/* Query each sub-key */
Status = ZwEnumerateKey(KeyHandle,
i++,
KeyBasicInformation,
KeyInfo,
Length,
&NumberOfBytes);
if (Status == STATUS_NO_MORE_ENTRIES) break;
/* Null-terminate the keyname, because the kernel does not */
KeyInfo->Name[KeyInfo->NameLength / sizeof(WCHAR)] = UNICODE_NULL;
/* Open this subkey */
Result = PciOpenKey(KeyInfo->Name,
KeyHandle,
KEY_QUERY_VALUE,
&SubKey,
&Status);
if (Result)
{
/* Query the identifier value for this subkey */
RtlInitUnicodeString(&ValueName, L"Identifier");
Status = ZwQueryValueKey(SubKey,
&ValueName,
KeyValuePartialInformation,
ValueInfo,
sizeof(KEY_VALUE_PARTIAL_INFORMATION) +
sizeof(L"PCI BIOS"),
&NumberOfBytes);
if (NT_SUCCESS(Status))
{
/* Check if this is the PCI BIOS subkey */
if (!wcsncmp((PWCHAR)ValueInfo->Data,
L"PCI BIOS",
ValueInfo->DataLength))
{
/* It is, proceed to query the PCI IRQ routing table */
Status = PciGetRegistryValue(L"Configuration Data",
L"RealModeIrqRoutingTable"
L"\\0",
SubKey,
REG_FULL_RESOURCE_DESCRIPTOR,
(PVOID*)&Package,
&NumberOfBytes);
ZwClose(SubKey);
break;
}
}
/* Close the subkey and try the next one */
ZwClose(SubKey);
}
}
/* Check if we got here because the routing table was found */
if (!NT_SUCCESS(Status)) break;
/* Check if a descriptor was found */
if (!Package) break;
/* Make sure the buffer is large enough to hold the table */
if ((NumberOfBytes < sizeof(*Package)) ||
(Package->Table.TableSize >
(NumberOfBytes - sizeof(CM_FULL_RESOURCE_DESCRIPTOR))))
{
/* Invalid package size */
Status = STATUS_UNSUCCESSFUL;
break;
}
/* Allocate space for the table */
Status = STATUS_INSUFFICIENT_RESOURCES;
*PciRoutingTable = ExAllocatePoolWithTag(PagedPool,
NumberOfBytes,
PCI_POOL_TAG);
if (!*PciRoutingTable) break;
/* Copy the registry data */
RtlCopyMemory(*PciRoutingTable,
&Package->Table,
NumberOfBytes - sizeof(CM_FULL_RESOURCE_DESCRIPTOR));
Status = STATUS_SUCCESS;
} while (FALSE);
/* Close any opened keys, free temporary allocations, and return status */
if (Package) ExFreePoolWithTag(Package, 0);
if (ValueInfo) ExFreePoolWithTag(ValueInfo, 0);
if (KeyInfo) ExFreePoolWithTag(KeyInfo, 0);
if (FullInfo) ExFreePoolWithTag(FullInfo, 0);
if (KeyHandle) ZwClose(KeyHandle);
return Status;
}
NTSTATUS
NTAPI
PciBuildHackTable(IN HANDLE KeyHandle)
{
PKEY_FULL_INFORMATION FullInfo;
ULONG i, HackCount;
PKEY_VALUE_FULL_INFORMATION ValueInfo;
PPCI_HACK_ENTRY Entry;
NTSTATUS Status;
ULONG NameLength, ResultLength;
ULONGLONG HackFlags;
/* So we know what to free at the end of the body */
FullInfo = NULL;
ValueInfo = NULL;
do
{
/* Query the size required for full key information */
Status = ZwQueryKey(KeyHandle,
KeyFullInformation,
NULL,
0,
&ResultLength);
if (Status != STATUS_BUFFER_TOO_SMALL) break;
/* Allocate the space required to hold the full key information */
Status = STATUS_INSUFFICIENT_RESOURCES;
ASSERT(ResultLength > 0);
FullInfo = ExAllocatePoolWithTag(PagedPool, ResultLength, PCI_POOL_TAG);
if (!FullInfo) break;
/* Go ahead and query the key information */
Status = ZwQueryKey(KeyHandle,
KeyFullInformation,
FullInfo,
ResultLength,
&ResultLength);
if (!NT_SUCCESS(Status)) break;
/* The only piece of information that's needed is the count of values */
HackCount = FullInfo->Values;
/* Free the structure now */
ExFreePoolWithTag(FullInfo, 0);
FullInfo = NULL;
/* Allocate the hack table, now that the number of entries is known */
Status = STATUS_INSUFFICIENT_RESOURCES;
ResultLength = sizeof(PCI_HACK_ENTRY) * HackCount;
PciHackTable = ExAllocatePoolWithTag(NonPagedPool,
ResultLength +
sizeof(PCI_HACK_ENTRY),
PCI_POOL_TAG);
if (!PciHackTable) break;
/* Allocate the space needed to hold the full value information */
ValueInfo = ExAllocatePoolWithTag(NonPagedPool,
sizeof(KEY_VALUE_FULL_INFORMATION) +
PCI_HACK_ENTRY_FULL_SIZE,
PCI_POOL_TAG);
if (!PciHackTable) break;
/* Loop each value in the registry */
Entry = &PciHackTable[0];
for (i = 0; i < HackCount; i++)
{
/* Get the entry for this value */
Entry = &PciHackTable[i];
/* Query the value in the key */
Status = ZwEnumerateValueKey(KeyHandle,
i,
KeyValueFullInformation,
ValueInfo,
sizeof(KEY_VALUE_FULL_INFORMATION) +
PCI_HACK_ENTRY_FULL_SIZE,
&ResultLength);
if (!NT_SUCCESS(Status))
{
/* Check why the call failed */
if ((Status != STATUS_BUFFER_OVERFLOW) &&
(Status != STATUS_BUFFER_TOO_SMALL))
{
/* The call failed due to an unknown error, bail out */
break;
}
/* The data seems to mismatch, try the next key in the list */
continue;
}
/* Check if the value data matches what's expected */
if ((ValueInfo->Type != REG_BINARY) ||
(ValueInfo->DataLength != sizeof(ULONGLONG)))
{
/* It doesn't, try the next key in the list */
continue;
}
/* Read the actual hack flags */
HackFlags = *(PULONGLONG)((ULONG_PTR)ValueInfo +
ValueInfo->DataOffset);
/* Check what kind of errata entry this is, based on the name */
NameLength = ValueInfo->NameLength;
if ((NameLength != PCI_HACK_ENTRY_SIZE) &&
(NameLength != PCI_HACK_ENTRY_REV_SIZE) &&
(NameLength != PCI_HACK_ENTRY_SUBSYS_SIZE) &&
(NameLength != PCI_HACK_ENTRY_FULL_SIZE))
{
/* It's an invalid entry, skip it */
DPRINT1("Skipping hack entry with invalid length name\n");
continue;
}
/* Initialize the entry */
RtlZeroMemory(Entry, sizeof(PCI_HACK_ENTRY));
/* Get the vendor and device data */
if (!(PciStringToUSHORT(ValueInfo->Name, &Entry->VendorID)) ||
!(PciStringToUSHORT(&ValueInfo->Name[4], &Entry->DeviceID)))
{
/* This failed, try the next entry */
continue;
}
/* Check if the entry contains subsystem information */
if ((NameLength == PCI_HACK_ENTRY_SUBSYS_SIZE) ||
(NameLength == PCI_HACK_ENTRY_FULL_SIZE))
{
/* Get the data */
if (!(PciStringToUSHORT(&ValueInfo->Name[8],
&Entry->SubVendorID)) ||
!(PciStringToUSHORT(&ValueInfo->Name[12],
&Entry->SubSystemID)))
{
/* This failed, try the next entry */
continue;
}
/* Save the fact this entry has finer controls */
Entry->Flags |= PCI_HACK_HAS_SUBSYSTEM_INFO;
}
/* Check if the entry contains revision information */
if ((NameLength == PCI_HACK_ENTRY_REV_SIZE) ||
(NameLength == PCI_HACK_ENTRY_FULL_SIZE))
{
/* Get the data */
if (!PciStringToUSHORT(&ValueInfo->Name[16],
&Entry->RevisionID))
{
/* This failed, try the next entry */
continue;
}
/* Save the fact this entry has finer controls */
Entry->Flags |= PCI_HACK_HAS_REVISION_INFO;
}
/* Only the last entry should have this set */
ASSERT(Entry->VendorID != PCI_INVALID_VENDORID);
/* Save the actual hack flags */
Entry->HackFlags = HackFlags;
/* Print out for the debugger's sake */
#ifdef HACK_DEBUG
DPRINT1("Adding Hack entry for Vendor:0x%04x Device:0x%04x ",
Entry->VendorID, Entry->DeviceID);
if (Entry->Flags & PCI_HACK_HAS_SUBSYSTEM_INFO)
DbgPrint("SybSys:0x%04x SubVendor:0x%04x ",
Entry->SubSystemID, Entry->SubVendorID);
if (Entry->Flags & PCI_HACK_HAS_REVISION_INFO)
DbgPrint("Revision:0x%02x", Entry->RevisionID);
DbgPrint(" = 0x%I64x\n", Entry->HackFlags);
#endif
}
/* Bail out in case of failure */
if (!NT_SUCCESS(Status)) break;
/* Terminate the table with an invalid entry */
ASSERT(Entry < (PciHackTable + HackCount + 1));
Entry->VendorID = PCI_INVALID_VENDORID;
/* Success path, free the temporary registry data */
ExFreePoolWithTag(ValueInfo, 0);
return STATUS_SUCCESS;
} while (TRUE);
/* Failure path, free temporary allocations and return failure code */
ASSERT(!NT_SUCCESS(Status));
if (FullInfo) ExFreePool(FullInfo);
if (ValueInfo) ExFreePool(ValueInfo);
if (PciHackTable) ExFreePool(PciHackTable);
return Status;
}
NTSTATUS
NTAPI
PciGetDebugPorts(IN HANDLE DebugKey)
{
UNREFERENCED_PARAMETER(DebugKey);
/* This function is not yet implemented */
UNIMPLEMENTED_DBGBREAK();
return STATUS_SUCCESS;
}
DRIVER_UNLOAD PciDriverUnload;
VOID
NTAPI
PciDriverUnload(IN PDRIVER_OBJECT DriverObject)
{
UNREFERENCED_PARAMETER(DriverObject);
/* This function is not yet implemented */
UNIMPLEMENTED_DBGBREAK("PCI: Unload\n");
}
NTSTATUS
NTAPI
DriverEntry(IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING RegistryPath)
{
HANDLE KeyHandle, ParametersKey, DebugKey, ControlSetKey;
BOOLEAN Result;
OBJECT_ATTRIBUTES ObjectAttributes;
ULONG ResultLength;
PULONG Value;
PWCHAR StartOptions;
UNICODE_STRING OptionString, PciLockString;
NTSTATUS Status;
DPRINT1("PCI: DriverEntry!\n");
/* Setup initial loop variables */
KeyHandle = NULL;
ParametersKey = NULL;
DebugKey = NULL;
ControlSetKey = NULL;
do
{
/* Remember our object so we can get it to it later */
PciDriverObject = DriverObject;
/* Setup the IRP dispatcher */
DriverObject->MajorFunction[IRP_MJ_POWER] = PciDispatchIrp;
DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = PciDispatchIrp;
DriverObject->MajorFunction[IRP_MJ_SYSTEM_CONTROL] = PciDispatchIrp;
DriverObject->MajorFunction[IRP_MJ_PNP] = PciDispatchIrp;
DriverObject->DriverUnload = PciDriverUnload;
/* This is how we'll detect a new PCI bus */
DriverObject->DriverExtension->AddDevice = PciAddDevice;
/* Open the PCI key */
InitializeObjectAttributes(&ObjectAttributes,
RegistryPath,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
NULL,
NULL);
Status = ZwOpenKey(&KeyHandle, KEY_QUERY_VALUE, &ObjectAttributes);
if (!NT_SUCCESS(Status)) break;
/* Open the Parameters subkey */
Result = PciOpenKey(L"Parameters",
KeyHandle,
KEY_QUERY_VALUE,
&ParametersKey,
&Status);
//if (!Result) break;
/* Build the list of all known PCI erratas */
Status = PciBuildHackTable(ParametersKey);
//if (!NT_SUCCESS(Status)) break;
/* Open the debug key, if it exists */
Result = PciOpenKey(L"Debug",
KeyHandle,
KEY_QUERY_VALUE,
&DebugKey,
&Status);
if (Result)
{
/* There are PCI debug devices, go discover them */
Status = PciGetDebugPorts(DebugKey);
if (!NT_SUCCESS(Status)) break;
}
/* Initialize the synchronization locks */
KeInitializeEvent(&PciGlobalLock, SynchronizationEvent, TRUE);
KeInitializeEvent(&PciBusLock, SynchronizationEvent, TRUE);
KeInitializeEvent(&PciLegacyDescriptionLock, SynchronizationEvent, TRUE);
/* Open the control set key */
Result = PciOpenKey(L"\\Registry\\Machine\\System\\CurrentControlSet",
NULL,
KEY_QUERY_VALUE,
&ControlSetKey,
&Status);
if (!Result) break;
/* Read the command line */
Status = PciGetRegistryValue(L"SystemStartOptions",
L"Control",
ControlSetKey,
REG_SZ,
(PVOID*)&StartOptions,
&ResultLength);
if (NT_SUCCESS(Status))
{
/* Initialize the command-line as a string */
OptionString.Buffer = StartOptions;
OptionString.MaximumLength = OptionString.Length = ResultLength;
/* Check if the command-line has the PCILOCK argument */
RtlInitUnicodeString(&PciLockString, L"PCILOCK");
if (PciUnicodeStringStrStr(&OptionString, &PciLockString, TRUE))
{
/* The PCI Bus driver will keep the BIOS-assigned resources */
PciLockDeviceResources = TRUE;
}
/* This data isn't needed anymore */
ExFreePoolWithTag(StartOptions, 0);
}
/* The PCILOCK feature can also be enabled per-system in the registry */
Status = PciGetRegistryValue(L"PCILock",
L"Control\\BiosInfo\\PCI",
ControlSetKey,
REG_DWORD,
(PVOID*)&Value,
&ResultLength);
if (NT_SUCCESS(Status))
{
/* Read the value it's been set to. This overrides /PCILOCK */
if (ResultLength == sizeof(ULONG)) PciLockDeviceResources = *Value;
ExFreePoolWithTag(Value, 0);
}
/* The system can have global PCI erratas in the registry */
Status = PciGetRegistryValue(L"HackFlags",
L"Control\\PnP\\PCI",
ControlSetKey,
REG_DWORD,
(PVOID*)&Value,
&ResultLength);
if (NT_SUCCESS(Status))
{
/* Read them in */
if (ResultLength == sizeof(ULONG)) PciSystemWideHackFlags = *Value;
ExFreePoolWithTag(Value, 0);
}
/* Check if the system should allow native ATA support */
Status = PciGetRegistryValue(L"EnableNativeModeATA",
L"Control\\PnP\\PCI",
ControlSetKey,
REG_DWORD,
(PVOID*)&Value,
&ResultLength);
if (NT_SUCCESS(Status))
{
/* This key is typically set by drivers, but users can force it */
if (ResultLength == sizeof(ULONG)) PciEnableNativeModeATA = *Value;
ExFreePoolWithTag(Value, 0);
}
/* Build the range lists for all the excluded resource areas */
Status = PciBuildDefaultExclusionLists();
if (!NT_SUCCESS(Status)) break;
/* Read the PCI IRQ Routing Table that the loader put in the registry */
PciGetIrqRoutingTableFromRegistry(&PciIrqRoutingTable);
/* Take over the HAL's default PCI Bus Handler routines */
PciHookHal();
/* Initialize verification of PCI BIOS and devices, if requested */
PciVerifierInit(DriverObject);
/* Check if this is a Datacenter SKU, which impacts IRQ alignment */
PciRunningDatacenter = PciIsDatacenter();
if (PciRunningDatacenter) DPRINT1("PCI running on datacenter build\n");
/* Check if the system has an ACPI Hardware Watchdog Timer */
//WdTable = PciGetAcpiTable(WDRT_SIGNATURE);
Status = STATUS_SUCCESS;
} while (FALSE);
/* Close all opened keys, return driver status to PnP Manager */
if (KeyHandle) ZwClose(KeyHandle);
if (ControlSetKey) ZwClose(ControlSetKey);
if (ParametersKey) ZwClose(ParametersKey);
if (DebugKey) ZwClose(DebugKey);
return Status;
}
/* EOF */
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