+VOID
+NTAPI
+PciWriteLimitsAndRestoreCurrent(IN PVOID Reserved,
+ IN PPCI_CONFIGURATOR_CONTEXT Context)
+{
+ PPCI_COMMON_HEADER PciData, Current;
+ PPCI_PDO_EXTENSION PdoExtension;
+
+ /* Grab all parameters from the context */
+ PdoExtension = Context->PdoExtension;
+ Current = Context->Current;
+ PciData = Context->PciData;
+
+ /* Write the limit discovery header */
+ PciWriteDeviceConfig(PdoExtension, PciData, 0, PCI_COMMON_HDR_LENGTH);
+
+ /* Now read what the device indicated the limits are */
+ PciReadDeviceConfig(PdoExtension, PciData, 0, PCI_COMMON_HDR_LENGTH);
+
+ /* Then write back the original configuration header */
+ PciWriteDeviceConfig(PdoExtension, Current, 0, PCI_COMMON_HDR_LENGTH);
+
+ /* Copy back the original command that was saved in the context */
+ Current->Command = Context->Command;
+ if (Context->Command)
+ {
+ /* Program it back into the device */
+ PciWriteDeviceConfig(PdoExtension,
+ &Context->Command,
+ FIELD_OFFSET(PCI_COMMON_HEADER, Command),
+ sizeof(USHORT));
+ }
+
+ /* Copy back the original status that was saved as well */
+ Current->Status = Context->Status;
+
+ /* Call the configurator to restore any other data that might've changed */
+ Context->Configurator->RestoreCurrent(Context);
+}
+
+NTSTATUS
+NTAPI
+PcipGetFunctionLimits(IN PPCI_CONFIGURATOR_CONTEXT Context)
+{
+ PPCI_CONFIGURATOR Configurator;
+ PPCI_COMMON_HEADER PciData, Current;
+ PPCI_PDO_EXTENSION PdoExtension;
+ PCI_IPI_CONTEXT IpiContext;
+ PIO_RESOURCE_DESCRIPTOR IoDescriptor;
+ ULONG Offset;
+ PAGED_CODE();
+
+ /* Grab all parameters from the context */
+ PdoExtension = Context->PdoExtension;
+ Current = Context->Current;
+ PciData = Context->PciData;
+
+ /* Save the current PCI Command and Status word */
+ Context->Status = Current->Status;
+ Context->Command = Current->Command;
+
+ /* Now that they're saved, clear the status, and disable all decodes */
+ Current->Status = 0;
+ Current->Command &= ~(PCI_ENABLE_IO_SPACE |
+ PCI_ENABLE_MEMORY_SPACE |
+ PCI_ENABLE_BUS_MASTER);
+
+ /* Make a copy of the current PCI configuration header (with decodes off) */
+ RtlCopyMemory(PciData, Current, PCI_COMMON_HDR_LENGTH);
+
+ /* Locate the correct resource configurator for this type of device */
+ Configurator = &PciConfigurators[PdoExtension->HeaderType];
+ Context->Configurator = Configurator;
+
+ /* Initialize it, which will typically setup the BARs for limit discovery */
+ Configurator->Initialize(Context);
+
+ /* Check for critical devices and PCI Debugging devices */
+ if ((PdoExtension->HackFlags & PCI_HACK_CRITICAL_DEVICE) ||
+ (PdoExtension->OnDebugPath))
+ {
+ /* Specifically check for a PCI Debugging device */
+ if (PdoExtension->OnDebugPath)
+ {
+ /* Was it enabled for bus mastering? */
+ if (Context->Command & PCI_ENABLE_BUS_MASTER)
+ {
+ /* This decode needs to be re-enabled so debugging can work */
+ PciData->Command |= PCI_ENABLE_BUS_MASTER;
+ Current->Command |= PCI_ENABLE_BUS_MASTER;
+ }
+
+ /* Disable the debugger while the discovery is happening */
+ KdDisableDebugger();
+ }
+
+ /* For these devices, an IPI must be sent to force high-IRQL discovery */
+ IpiContext.Barrier = 1;
+ IpiContext.RunCount = 1;
+ IpiContext.PdoExtension = PdoExtension;
+ IpiContext.Function = PciWriteLimitsAndRestoreCurrent;
+ IpiContext.Context = Context;
+ KeIpiGenericCall(PciExecuteCriticalSystemRoutine, (ULONG_PTR)&IpiContext);
+
+ /* Re-enable the debugger if this was a PCI Debugging Device */
+ if (PdoExtension->OnDebugPath) KdEnableDebugger();
+ }
+ else
+ {
+ /* Otherwise, it's safe to do this in-line at low IRQL */
+ PciWriteLimitsAndRestoreCurrent(PdoExtension, Context);
+ }
+
+ /*
+ * Check if it's valid to compare the headers to see if limit discovery mode
+ * has properly exited (the expected case is that the PCI header would now
+ * be equal to what it was before). In some cases, it is known that this will
+ * fail, because during PciApplyHacks (among other places), software hacks
+ * had to be applied to the header, which the hardware-side will not see, and
+ * thus the headers would appear "different".
+ */
+ if (!PdoExtension->ExpectedWritebackFailure)
+ {
+ /* Read the current PCI header now, after discovery has completed */
+ PciReadDeviceConfig(PdoExtension, PciData + 1, 0, PCI_COMMON_HDR_LENGTH);
+
+ /* Check if the current header at entry, is equal to the header now */
+ Offset = RtlCompareMemory(PciData + 1, Current, PCI_COMMON_HDR_LENGTH);
+ if (Offset != PCI_COMMON_HDR_LENGTH)
+ {
+ /* It's not, which means configuration somehow changed, dump this */
+ DPRINT1("PCI - CFG space write verify failed at offset 0x%x\n", Offset);
+ PciDebugDumpCommonConfig(PciData + 1);
+ DPRINT1("----------\n");
+ PciDebugDumpCommonConfig(Current);
+ }
+ }
+
+ /* This PDO should not already have resources, since this is only done once */
+ ASSERT(PdoExtension->Resources == NULL);
+
+ /* Allocate the structure that will hold the discovered resources and limits */
+ PdoExtension->Resources = ExAllocatePoolWithTag(NonPagedPool,
+ sizeof(PCI_FUNCTION_RESOURCES),
+ 'BicP');
+ if (!PdoExtension->Resources) return STATUS_INSUFFICIENT_RESOURCES;
+
+ /* Clear it out for now */
+ RtlZeroMemory(PdoExtension->Resources, sizeof(PCI_FUNCTION_RESOURCES));
+
+ /* Now call the configurator, which will first store the limits... */
+ Configurator->SaveLimits(Context);
+
+ /* ...and then store the current resources being used */
+ Configurator->SaveCurrentSettings(Context);
+
+ /* Loop all the limit descriptors backwards */
+ IoDescriptor = &PdoExtension->Resources->Limit[PCI_TYPE0_ADDRESSES + 1];
+ while (TRUE)
+ {
+ /* Keep going until a non-null descriptor is found */
+ IoDescriptor--;
+ if (IoDescriptor->Type != CmResourceTypeNull) break;
+
+ /* This is a null descriptor, is it the last one? */
+ if (IoDescriptor == &PdoExtension->Resources->Limit[PCI_TYPE0_ADDRESSES + 1])
+ {
+ /* This means the descriptor is NULL, which means discovery failed */
+ DPRINT1("PCI Resources fail!\n");
+
+ /* No resources will be assigned for the device */
+ ExFreePoolWithTag(PdoExtension->Resources, 0);
+ PdoExtension->Resources = NULL;
+ break;
+ }
+ }
+
+ /* Return success here, even if the device has no assigned resources */
+ return STATUS_SUCCESS;
+}
+
+NTSTATUS
+NTAPI
+PciGetFunctionLimits(IN PPCI_PDO_EXTENSION PdoExtension,
+ IN PPCI_COMMON_HEADER Current,
+ IN ULONGLONG HackFlags)
+{
+ NTSTATUS Status;
+ PPCI_COMMON_HEADER PciData;
+ PCI_CONFIGURATOR_CONTEXT Context;
+ PAGED_CODE();
+
+ /* Do the hackflags indicate this device should be skipped? */
+ if (PciSkipThisFunction(Current,
+ PdoExtension->Slot,
+ PCI_SKIP_RESOURCE_ENUMERATION,
+ HackFlags))
+ {
+ /* Do not process its resources */
+ return STATUS_SUCCESS;
+ }
+
+ /* Allocate a buffer to hold two PCI configuration headers */
+ PciData = ExAllocatePoolWithTag(0, 2 * PCI_COMMON_HDR_LENGTH, 'BicP');
+ if (!PciData) return STATUS_INSUFFICIENT_RESOURCES;
+
+ /* Set up the context for the resource enumeration, and do it */
+ Context.Current = Current;
+ Context.PciData = PciData;
+ Context.PdoExtension = PdoExtension;
+ Status = PcipGetFunctionLimits(&Context);
+
+ /* Enumeration is completed, free the PCI headers and return the status */
+ ExFreePoolWithTag(PciData, 0);
+ return Status;
+}
+
+VOID
+NTAPI
+PciProcessBus(IN PPCI_FDO_EXTENSION DeviceExtension)
+{
+ PPCI_PDO_EXTENSION PdoExtension;
+ PDEVICE_OBJECT PhysicalDeviceObject;
+ PAGED_CODE();
+
+ /* Get the PDO Extension */
+ PhysicalDeviceObject = DeviceExtension->PhysicalDeviceObject;
+ PdoExtension = (PPCI_PDO_EXTENSION)PhysicalDeviceObject->DeviceExtension;
+
+ /* Cheeck if this is the root bus */
+ if (!PCI_IS_ROOT_FDO(DeviceExtension))
+ {
+ /* Not really handling this year */
+ UNIMPLEMENTED;
+ while (TRUE);
+
+ /* Check for PCI bridges with the ISA bit set, or required */
+ if ((PdoExtension) &&
+ (PciClassifyDeviceType(PdoExtension) == PciTypePciBridge) &&
+ ((PdoExtension->Dependent.type1.IsaBitRequired) ||
+ (PdoExtension->Dependent.type1.IsaBitSet)))
+ {
+ /* We'll need to do some legacy support */
+ UNIMPLEMENTED;
+ while (TRUE);
+ }
+ }
+ else
+ {
+ /* Scan all of the root bus' children bridges */
+ for (PdoExtension = DeviceExtension->ChildBridgePdoList;
+ PdoExtension;
+ PdoExtension = PdoExtension->NextBridge)
+ {
+ /* Find any that have the VGA decode bit on */
+ if (PdoExtension->Dependent.type1.VgaBitSet)
+ {
+ /* Again, some more legacy support we'll have to do */
+ UNIMPLEMENTED;
+ while (TRUE);
+ }
+ }
+ }
+
+ /* Check for ACPI systems where the OS assigns bus numbers */
+ if (PciAssignBusNumbers)
+ {
+ /* Not yet supported */
+ UNIMPLEMENTED;
+ while (TRUE);
+ }
+}
+
projects / reactos.git / blobdiff