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diff --git a/src/arch/x86/regs/apic.hh b/src/arch/x86/regs/apic.hh
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+++ b/src/arch/x86/regs/apic.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_APICREGS_HH__
+#define __ARCH_X86_APICREGS_HH__
+
+#include "base/bitunion.hh"
+
+namespace X86ISA
+{
+    enum ApicRegIndex
+    {
+        APIC_ID,
+        APIC_VERSION,
+        APIC_TASK_PRIORITY,
+        APIC_ARBITRATION_PRIORITY,
+        APIC_PROCESSOR_PRIORITY,
+        APIC_EOI,
+        APIC_LOGICAL_DESTINATION,
+        APIC_DESTINATION_FORMAT,
+        APIC_SPURIOUS_INTERRUPT_VECTOR,
+
+        APIC_IN_SERVICE_BASE,
+
+        APIC_TRIGGER_MODE_BASE = APIC_IN_SERVICE_BASE + 16,
+
+        APIC_INTERRUPT_REQUEST_BASE = APIC_TRIGGER_MODE_BASE + 16,
+
+        APIC_ERROR_STATUS = APIC_INTERRUPT_REQUEST_BASE + 16,
+        APIC_INTERRUPT_COMMAND_LOW,
+        APIC_INTERRUPT_COMMAND_HIGH,
+        APIC_LVT_TIMER,
+        APIC_LVT_THERMAL_SENSOR,
+        APIC_LVT_PERFORMANCE_MONITORING_COUNTERS,
+        APIC_LVT_LINT0,
+        APIC_LVT_LINT1,
+        APIC_LVT_ERROR,
+        APIC_INITIAL_COUNT,
+        APIC_CURRENT_COUNT,
+        APIC_DIVIDE_CONFIGURATION,
+
+        APIC_INTERNAL_STATE,
+
+        NUM_APIC_REGS
+    };
+
+    static inline ApicRegIndex
+    APIC_IN_SERVICE(int index)
+    {
+        return (ApicRegIndex)(APIC_IN_SERVICE_BASE + index);
+    }
+
+    static inline ApicRegIndex
+    APIC_TRIGGER_MODE(int index)
+    {
+        return (ApicRegIndex)(APIC_TRIGGER_MODE_BASE + index);
+    }
+
+    static inline ApicRegIndex
+    APIC_INTERRUPT_REQUEST(int index)
+    {
+        return (ApicRegIndex)(APIC_INTERRUPT_REQUEST_BASE + index);
+    }
+
+    BitUnion32(InterruptCommandRegLow)
+        Bitfield<7, 0> vector;
+        Bitfield<10, 8> deliveryMode;
+        Bitfield<11> destMode;
+        Bitfield<12> deliveryStatus;
+        Bitfield<14> level;
+        Bitfield<15> trigger;
+        Bitfield<19, 18> destShorthand;
+    EndBitUnion(InterruptCommandRegLow)
+
+    BitUnion32(InterruptCommandRegHigh)
+        Bitfield<31, 24> destination;
+    EndBitUnion(InterruptCommandRegHigh)
+}
+
+#endif