Implement KD subsystem, add serial & framebuffer debug providers

xtoskrnl/kd/globals.c

@@ -0,0 +1,31 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/kd/globals.c
+ * DESCRIPTION:     Architecture independent global variables related to KD subsystem
+ * DEVELOPERS:      Aiken Harris <harraiken91@gmail.com>
+ */
+
+#include <xtos.h>
+
+
+/* Pointer to DbgPrint() routine */
+PKD_PRINT_ROUTINE KdPrint = NULL;
+
+/* Kernel Debugger mode */
+KD_DEBUG_MODE KdpDebugMode;
+
+/* Debugger I/O providers initialization routines */
+PKD_INIT_ROUTINE KdpIoProvidersInitRoutines[KDBG_PROVIDERS_COUNT] = {
+    KdpInitializeFrameBufferProvider,
+    KdpInitializeSerialPortProvider
+};
+
+/* List of active I/O providers */
+LIST_ENTRY KdpProviders;
+
+/* Debugger's serial port handle */
+CPPORT KdpSerialPort;
+
+/* Pre-defined serial port addresses */
+ULONG KdpSerialPortList[COMPORT_COUNT] = COMPORT_ADDRESS;