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diff --git a/src/arch/x86/bios/ACPI.py b/src/arch/x86/bios/ACPI.py
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+++ b/src/arch/x86/bios/ACPI.py
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+# Copyright (c) 2008 The Hewlett-Packard Development Company
+# All rights reserved.
+#
+# Redistribution and use of this software in source and binary forms,
+# with or without modification, are permitted provided that the
+# following conditions are met:
+#
+# The software must be used only for Non-Commercial Use which means any
+# use which is NOT directed to receiving any direct monetary
+# compensation for, or commercial advantage from such use.  Illustrative
+# examples of non-commercial use are academic research, personal study,
+# teaching, education and corporate research & development.
+# Illustrative examples of commercial use are distributing products for
+# commercial advantage and providing services using the software for
+# commercial advantage.
+#
+# If you wish to use this software or functionality therein that may be
+# covered by patents for commercial use, please contact:
+#     Director of Intellectual Property Licensing
+#     Office of Strategy and Technology
+#     Hewlett-Packard Company
+#     1501 Page Mill Road
+#     Palo Alto, California  94304
+#
+# 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 HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.  No right of
+# sublicense is granted herewith.  Derivatives of the software and
+# output created using the software may be prepared, but only for
+# Non-Commercial Uses.  Derivatives of the software may be shared with
+# others provided: (i) the others agree to abide by the list of
+# conditions herein which includes the Non-Commercial Use restrictions;
+# and (ii) such Derivatives of the software include the above copyright
+# notice to acknowledge the contribution from this software where
+# applicable, this list of conditions and the disclaimer below.
+#
+# 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
+
+from m5.params import *
+from m5.SimObject import SimObject
+
+# ACPI description table header. Subclasses contain and handle the actual
+# contents as appropriate for that type of table.
+class X86ACPISysDescTable(SimObject):
+    type = 'X86ACPISysDescTable'
+    cxx_class = 'X86ISA::ACPI::SysDescTable'
+    abstract = True
+
+    oem_id = Param.String('', 'string identifying the oem')
+    oem_table_id = Param.String('', 'oem table ID')
+    oem_revision = Param.UInt32(0, 'oem revision number for the table')
+
+    creator_id = Param.String('',
+            'string identifying the generator of the table')
+    creator_revision = Param.UInt32(0,
+            'revision number for the creator of the table')
+
+class X86ACPIRSDT(X86ACPISysDescTable):
+    type = 'X86ACPIRSDT'
+    cxx_class = 'X86ISA::ACPI::RSDT'
+
+    entries = VectorParam.X86ACPISysDescTable([], 'system description tables')
+
+class X86ACPIXSDT(X86ACPISysDescTable):
+    type = 'X86ACPIXSDT'
+    cxx_class = 'X86ISA::ACPI::XSDT'
+
+    entries = VectorParam.X86ACPISysDescTable([], 'system description tables')
+
+# Root System Description Pointer Structure
+class X86ACPIRSDP(SimObject):
+    type = 'X86ACPIRSDP'
+    cxx_class = 'X86ISA::ACPI::RSDP'
+
+    oem_id = Param.String('', 'string identifying the oem')
+    # Because 0 encodes ACPI 1.0, 2 encodes ACPI 3.0, the version implemented
+    # here.
+    revision = Param.UInt8(2, 'revision of ACPI being used, zero indexed')
+
+    rsdt = Param.X86ACPIRSDT(NULL, 'root system description table')
+    xsdt = Param.X86ACPIXSDT(X86ACPIXSDT(),
+            'extended system description table')