diff --git a/sdk/xtdk/amd64/rtlfuncs.h b/sdk/xtdk/amd64/rtlfuncs.h
new file mode 100644
index 0000000..86af1e1
--- /dev/null
+++ b/sdk/xtdk/amd64/rtlfuncs.h
@@ -0,0 +1,22 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            sdk/xtdk/amd64/rtlfuncs.h
+ * DESCRIPTION:     XT runtime library routines specific to AMD64 architecture
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#ifndef __XTDK_AMD64_RTLFUNCS_H
+#define __XTDK_AMD64_RTLFUNCS_H
+
+#include <xtdefs.h>
+#include <xtstruct.h>
+#include <xttypes.h>
+
+
+XTAPI
+VOID
+RtlGetStackLimits(OUT PULONG_PTR StackBase,
+                  OUT PULONG_PTR StackLimit);
+
+#endif /* __XTDK_AMD64_RTLFUNCS_H */
diff --git a/sdk/xtdk/i686/rtlfuncs.h b/sdk/xtdk/i686/rtlfuncs.h
new file mode 100644
index 0000000..bda06cf
--- /dev/null
+++ b/sdk/xtdk/i686/rtlfuncs.h
@@ -0,0 +1,22 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            sdk/xtdk/i686/rtlfuncs.h
+ * DESCRIPTION:     XT runtime library routines specific to i686 architecture
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#ifndef __XTDK_I686_RTLFUNCS_H
+#define __XTDK_I686_RTLFUNCS_H
+
+#include <xtdefs.h>
+#include <xtstruct.h>
+#include <xttypes.h>
+
+
+XTAPI
+VOID
+RtlGetStackLimits(OUT PULONG_PTR StackBase,
+                  OUT PULONG_PTR StackLimit);
+
+#endif /* __XTDK_I686_RTLFUNCS_H */
diff --git a/sdk/xtdk/xtkmapi.h b/sdk/xtdk/xtkmapi.h
index 825faa9..da5e380 100644
--- a/sdk/xtdk/xtkmapi.h
+++ b/sdk/xtdk/xtkmapi.h
@@ -47,6 +47,7 @@
 /* Architecture specific XT routines*/
 #include ARCH_HEADER(arfuncs.h)
 #include ARCH_HEADER(hlfuncs.h)
+#include ARCH_HEADER(rtlfuncs.h)
 
 /* Callbacks */
 #include <kertptr.h>
diff --git a/xtoskrnl/CMakeLists.txt b/xtoskrnl/CMakeLists.txt
index c7c9867..4d7efbb 100644
--- a/xtoskrnl/CMakeLists.txt
+++ b/xtoskrnl/CMakeLists.txt
@@ -26,7 +26,8 @@ list(APPEND XTOSKRNL_SOURCE
     ${XTOSKRNL_SOURCE_DIR}/rtl/memory.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/plist.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/string.c
-    ${XTOSKRNL_SOURCE_DIR}/rtl/widestr.c)
+    ${XTOSKRNL_SOURCE_DIR}/rtl/widestr.c
+    ${XTOSKRNL_SOURCE_DIR}/rtl/${ARCH}/dispatch.c)
 
 # Set module definition SPEC file
 set_specfile(xtoskrnl.spec)
diff --git a/xtoskrnl/rtl/amd64/dispatch.c b/xtoskrnl/rtl/amd64/dispatch.c
new file mode 100644
index 0000000..61c664e
--- /dev/null
+++ b/xtoskrnl/rtl/amd64/dispatch.c
@@ -0,0 +1,33 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/rtl/amd64/dispatch.c
+ * DESCRIPTION:     Dispatching support for AMD64 architecture
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#include <xtos.h>
+
+
+/**
+ * Returns the stack limits for the current thread.
+ *
+ * @param StackBase
+ *        Supplies a pointer to memory area, where the stack base will be stored.
+ *
+ * @param StackLimit
+ *        Suppliws a pointer to memory area, where the stack limit will be stored.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+RtlGetStackLimits(OUT PULONG_PTR StackBase,
+                  OUT PULONG_PTR StackLimit)
+{
+    PKTHREAD Thread = KeGetCurrentThread();
+    *StackBase = (ULONG_PTR)Thread->StackBase;
+    *StackLimit = (ULONG_PTR)Thread->StackLimit;
+}
diff --git a/xtoskrnl/rtl/i686/dispatch.c b/xtoskrnl/rtl/i686/dispatch.c
new file mode 100644
index 0000000..0c8ac96
--- /dev/null
+++ b/xtoskrnl/rtl/i686/dispatch.c
@@ -0,0 +1,33 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/rtl/i686/dispatch.c
+ * DESCRIPTION:     Dispatching support for i686 architecture
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#include <xtos.h>
+
+
+/**
+ * Returns the stack limits for the current thread.
+ *
+ * @param StackBase
+ *        Supplies a pointer to memory area, where the stack base will be stored.
+ *
+ * @param StackLimit
+ *        Suppliws a pointer to memory area, where the stack limit will be stored.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+RtlGetStackLimits(OUT PULONG_PTR StackBase,
+                  OUT PULONG_PTR StackLimit)
+{
+    PKTHREAD Thread = KeGetCurrentThread();
+    *StackBase = (ULONG_PTR)Thread->StackBase - sizeof(FX_SAVE_AREA);
+    *StackLimit = (ULONG_PTR)Thread->StackLimit;
+}