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diff --git a/src/arch/x86/cpuid.hh b/src/arch/x86/cpuid.hh
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+/*
+ * Copyright (c) 2008 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Gabe Black
+ */
+
+#ifndef __ARCH_X86_CPUID_HH__
+#define __ARCH_X86_CPUID_HH__
+
+#include <inttypes.h>
+
+class ThreadContext;
+
+namespace X86ISA
+{
+    struct CpuidResult
+    {
+        uint64_t rax;
+        uint64_t rbx;
+        uint64_t rcx;
+        uint64_t rdx;
+
+        // These are not in alphebetical order on purpose. The order reflects
+        // how the CPUID orders the registers when it returns results.
+        CpuidResult(uint64_t _rax, uint64_t _rbx,
+                    uint64_t _rdx, uint64_t _rcx) :
+            rax(_rax), rbx(_rbx), rcx(_rcx), rdx(_rdx)
+        {}
+
+        CpuidResult()
+        {}
+    };
+
+    bool doCpuid(ThreadContext * tc, uint32_t function, CpuidResult &result);
+} // namespace X86ISA
+
+#endif