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diff --git a/qtmips_machine/machinedefs.h b/qtmips_machine/machinedefs.h
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+// SPDX-License-Identifier: GPL-2.0+
+/*******************************************************************************
+ * QtMips - MIPS 32-bit Architecture Subset Simulator
+ *
+ * Implemented to support following courses:
+ *
+ *   B35APO - Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b35apo
+ *
+ *   B4M35PAP - Advanced Computer Architectures
+ *   https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
+ *
+ * Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
+ * Copyright (c) 2019      Pavel Pisa <pisa@cmp.felk.cvut.cz>
+ *
+ * Faculty of Electrical Engineering (http://www.fel.cvut.cz)
+ * Czech Technical University        (http://www.cvut.cz/)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ *
+ ******************************************************************************/
+
+#ifndef MACHINEDEFS_H
+#define MACHINEDEFS_H
+
+#include <stdint.h>
+
+namespace machine {
+
+enum AccessControl {
+    AC_NONE,
+    AC_BYTE,
+    AC_HALFWORD,
+    AC_WORD,
+    AC_BYTE_UNSIGNED,
+    AC_HALFWORD_UNSIGNED,
+    AC_CACHE_OP,
+};
+
+enum AluOp : std::uint8_t {
+    ALU_OP_SLL = 0,
+    ALU_OP_SRL = 2,
+    ALU_OP_SRA,
+    ALU_OP_SLLV,
+    ALU_OP_SRLV = 6,
+    ALU_OP_SRAV,
+    ALU_OP_JR,
+    ALU_OP_JALR,
+    ALU_OP_MOVZ,
+    ALU_OP_MOVN,
+    ALU_OP_BREAK = 13,
+    ALU_OP_MFHI = 16,
+    ALU_OP_MTHI,
+    ALU_OP_MFLO,
+    ALU_OP_MTLO,
+    ALU_OP_MULT = 24,
+    ALU_OP_MULTU = 25,
+    ALU_OP_DIV = 26,
+    ALU_OP_DIVU = 27,
+    ALU_OP_ADD = 32,
+    ALU_OP_ADDU,
+    ALU_OP_SUB,
+    ALU_OP_SUBU,
+    ALU_OP_AND,
+    ALU_OP_OR,
+    ALU_OP_XOR,
+    ALU_OP_NOR,
+    ALU_OP_SLT = 42,
+    ALU_OP_SLTU,
+    ALU_OP_LUI = 64, // We don't care about exact index for this one
+    ALU_OP_PASS_S, // Pass s argument without change for JAL
+    ALU_OP_UNKNOWN, // Pass s argument without change for JAL
+    ALU_OP_LAST // First impossible operation (just to be sure that we don't overflow)
+};
+
+}
+
+#endif // MACHINEDEFS_H