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,
return Status;
}
+UCHAR
+NTAPI
+PciReadDeviceCapability(IN PPCI_PDO_EXTENSION DeviceExtension,
+ IN UCHAR Offset,
+ IN ULONG CapabilityId,
+ OUT PPCI_CAPABILITIES_HEADER Buffer,
+ IN ULONG Length)
+{
+ 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;
+}
+
+BOOLEAN
+NTAPI
+PciCanDisableDecodes(IN PPCI_PDO_EXTENSION DeviceExtension,
+ IN PPCI_COMMON_HEADER Config,
+ IN ULONGLONG HackFlags,
+ IN BOOLEAN ForPowerDown)
+{
+ 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);
+}
+
/* EOF */
projects / reactos.git / blobdiff