+ PVOID ControlStart;
+ PKPRCB Prcb = KiProcessorBlock[Processor];
+ PKIPCR Pcr = CONTAINING_RECORD(Prcb, KIPCR, Prcb);
+
+ switch (BaseAddress)
+ {
+ case AMD64_DEBUG_CONTROL_SPACE_KPCR:
+ /* Copy a pointer to the Pcr */
+ ControlStart = &Pcr;
+ *ActualLength = sizeof(PVOID);
+ break;
+
+ case AMD64_DEBUG_CONTROL_SPACE_KPRCB:
+ /* Copy a pointer to the Prcb */
+ ControlStart = &Prcb;
+ *ActualLength = sizeof(PVOID);
+ break;
+
+ case AMD64_DEBUG_CONTROL_SPACE_KSPECIAL:
+ /* Copy SpecialRegisters */
+ ControlStart = &Prcb->ProcessorState.SpecialRegisters;
+ *ActualLength = sizeof(KSPECIAL_REGISTERS);
+ break;
+
+ case AMD64_DEBUG_CONTROL_SPACE_KTHREAD:
+ /* Copy a pointer to the current Thread */
+ ControlStart = &Prcb->CurrentThread;
+ *ActualLength = sizeof(PVOID);
+ break;
+
+ default:
+ *ActualLength = 0;
+ ASSERT(FALSE);
+ return STATUS_UNSUCCESSFUL;
+ }
+
+ /* Copy the memory */
+ RtlCopyMemory(Buffer, ControlStart, min(Length, *ActualLength));
+
+ /* Finish up */
+ return STATUS_SUCCESS;