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diff --git a/test/geekos_test_vm/include/geekos/tss.h b/test/geekos_test_vm/include/geekos/tss.h
new file mode 100644
index 0000000..66ea118
--- /dev/null
+++ b/test/geekos_test_vm/include/geekos/tss.h
@@ -0,0 +1,89 @@
+/*
+ * x86 TSS data structure and routines
+ * Copyright (c) 2001,2004 David H. Hovemeyer <daveho@cs.umd.edu>
+ * $Revision: 1.1 $
+ * 
+ * This is free software.  You are permitted to use,
+ * redistribute, and modify it as specified in the file "COPYING".
+ */
+
+#ifndef GEEKOS_TSS_H
+#define GEEKOS_TSS_H
+
+/*
+ * Source: _Protected Mode Software Architecture_ by Tom Shanley,
+ * ISBN 020155447X.
+ */
+
+/*
+ * NOTE: all reserved fields must be set to zero.
+ */
+
+struct TSS {
+    /*
+     * Link to nested task.  For example, if an interrupt is handled
+     * by a task gate, the link field will contain the selector for
+     * the TSS of the interrupted task.
+     */
+    ushort_t link;
+    ushort_t reserved1;
+
+    /* Stacks for privilege levels.  esp0/ss0 specifies the kernel stack. */
+    ulong_t esp0;
+    ushort_t ss0;
+    ushort_t reserved2;
+    ulong_t esp1;
+    ushort_t ss1;
+    ushort_t reserved3;
+    ulong_t esp2;
+    ushort_t ss2;
+    ushort_t reserved4;
+
+    /* Page directory register. */
+    ulong_t cr3;
+
+    /* General processor registers. */
+    ulong_t eip;
+    ulong_t eflags;
+    ulong_t eax;
+    ulong_t ecx;
+    ulong_t edx;
+    ulong_t ebx;
+    ulong_t esp;
+    ulong_t ebp;
+    ulong_t esi;
+    ulong_t edi;
+
+    /* Segment registers and padding. */
+    ushort_t es;
+    ushort_t reserved5;
+    ushort_t cs;
+    ushort_t reserved6;
+    ushort_t ss;
+    ushort_t reserved7;
+    ushort_t ds;
+    ushort_t reserved8;
+    ushort_t fs;
+    ushort_t reserved9;
+    ushort_t gs;
+    ushort_t reserved10;
+
+    /* GDT selector for the LDT descriptor. */
+    ushort_t ldt;
+    ushort_t reserved11;
+
+    /*
+     * The debug trap bit causes a debug exception upon a switch
+     * to the task specified by this TSS.
+     */
+    uint_t debugTrap : 1;
+    uint_t reserved12 : 15;
+
+    /* Offset in the TSS specifying where the io map is located. */
+    ushort_t ioMapBase;
+};
+
+void Init_TSS(void);
+void Set_Kernel_Stack_Pointer(ulong_t esp0);
+
+#endif  /* GEEKOS_TSS_H */