Rewrite core of the XTLDR boot loader

Reviewed-on: xt-sys/exectos#7
Reviewed-by: Piotr Likoski <likoski@noreply.codingworkshop.git>
Co-authored-by: Rafal Kupiec <belliash@codingworkshop.eu.org>
Co-committed-by: Rafal Kupiec <belliash@codingworkshop.eu.org>

sdk/xtdk/blfuncs.h

@@ -0,0 +1,23 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            sdk/xtdk/blfuncs.h
+ * DESCRIPTION:     XT Boot Manager routines
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#ifndef __XTDK_BLFUNCS_H
+#define __XTDK_BLFUNCS_H
+
+#include <xttypes.h>
+#include <xtuefi.h>
+
+
+/* XT BootLoader routines forward references */
+XTCDECL
+EFI_STATUS
+BlGetXtLdrProtocol(IN PEFI_SYSTEM_TABLE SystemTable,
+                   IN EFI_HANDLE ImageHandle,
+                   OUT PXTBL_LOADER_PROTOCOL *ProtocolHandler);
+
+#endif /* __XTDK_BLFUNCS_H */