X86: Implement the lgdt instruction.

--HG--
extra : convert_revision : d1698a82df3c57cc9bbf8d5d190f271bfc7cb2e4

2 files changed, 115 insertions, 1 deletions

diff --git a/src/arch/x86/isa/insts/system/__init__.py b/src/arch/x86/isa/insts/system/__init__.py
index 422438b1c..5984761a6 100644
--- a/src/arch/x86/isa/insts/system/__init__.py
+++ b/src/arch/x86/isa/insts/system/__init__.py
@@ -55,7 +55,8 @@
 
 categories = ["halt",
               "undefined_operation",
-              "msrs"]
+              "msrs",
+              "segmentation"]
 
 microcode = ""
 for category in categories:
diff --git a/src/arch/x86/isa/insts/system/segmentation.py b/src/arch/x86/isa/insts/system/segmentation.py
new file mode 100644
index 000000000..6067f64a0
--- /dev/null
+++ b/src/arch/x86/isa/insts/system/segmentation.py
@@ -0,0 +1,113 @@
+# Copyright (c) 2007 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
+
+microcode = '''
+def macroop LGDT_M
+{
+    .adjust_env oszForPseudoDesc
+
+    # Get the limit
+    ld t1, seg, sib, disp, dataSize=2
+    # Get the base
+    ld t2, seg, sib, 'adjustedDisp + 2'
+    wrbase gdtr, t2
+    wrlimit gdtr, t1
+};
+
+def macroop LGDT_P
+{
+    .adjust_env oszForPseudoDesc
+
+    rdip t7
+    # Get the limit
+    ld t1, seg, riprel, disp, dataSize=2
+    # Get the base
+    ld t2, seg, riprel, 'adjustedDisp + 2'
+    wrbase gdtr, t2
+    wrlimit gdtr, t1
+};
+
+#
+# These versions are for when the original data size was 16 bits. The base is
+# still 32 bits, but the top byte is zeroed before being used.
+#
+
+def macroop LGDT_16_M
+{
+    .adjust_env oszForPseudoDesc
+
+    # Get the limit
+    ld t1, seg, sib, disp, dataSize=2
+    # Get the base
+    ld t2, seg, sib, 'adjustedDisp + 2', dataSize=4
+    zexti t2, t2, 23
+    wrbase gdtr, t2
+    wrlimit gdtr, t1
+};
+
+def macroop LGDT_16_P
+{
+    .adjust_env oszForPseudoDesc
+
+    rdip t7
+    # Get the limit
+    ld t1, seg, riprel, disp, dataSize=2
+    # Get the base
+    ld t2, seg, riprel, 'adjustedDisp + 2', dataSize=4
+    zexti t2, t2, 23
+    wrbase gdtr, t2
+    wrlimit gdtr, t1
+};
+'''