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diff --git a/ext/nomali/lib/addrspace.hh b/ext/nomali/lib/addrspace.hh
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+/*
+ * Copyright (c) 2016 ARM Limited
+ * All rights reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Authors: Andreas Sandberg
+ */
+
+#ifndef _LIBNOMALIMODEL_ADDRSPACE_HH
+#define _LIBNOMALIMODEL_ADDRSPACE_HH
+
+#include <vector>
+
+#include "gpublock.hh"
+#include "types.hh"
+
+namespace NoMali {
+
+class GPU;
+
+class MMU;
+
+/**
+ * Midgard job slot implementation.
+ *
+ * A job slot is a part of a JobControl block that controls the state
+ * of one out of 16 active jobs. Each slot can contain one running job
+ * and a pending job.
+ */
+class AddrSpace
+    : public GPUBlock
+{
+  public:
+    AddrSpace(GPU &_gpu, MMU &_mmu, uint8_t slot_id);
+    AddrSpace(AddrSpace &&rhs);
+    virtual ~AddrSpace();
+
+    void writeReg(RegAddr idx, uint32_t value) override;
+
+  protected:
+    /**
+     * @{
+     * @name Address Space Control
+     */
+
+
+    /** @} */
+
+    /**
+     * @{
+     * @name Job slot commands
+     */
+
+    /**
+     * Address space command dispatcher.
+     *
+     * This method is called whenever there is a write to the
+     * ASn_COMMAND register. The method uses a lookup table to call
+     * the right command handling method.
+     *
+     * @param cmd Command number (see the Midgard architecture
+     * specification)
+     */
+    void asCommand(uint32_t cmd);
+
+    /**
+     * Command handler for No-ops.
+     *
+     * @param cmd Command number (see the Midgard architecture
+     * specification)
+     */
+    void cmdNop(uint32_t cmd);
+
+    void cmdUpdate(uint32_t cmd);
+    void cmdLock(uint32_t cmd);
+    void cmdUnlock(uint32_t cmd);
+    void cmdFlushPT(uint32_t cmd);
+    void cmdFlushMem(uint32_t cmd);
+
+    /** @} */
+
+    /** Address space ID */
+    const uint8_t id;
+
+    /** Parent MMU block */
+    MMU &mmu;
+
+  private:
+    typedef void (AddrSpace::*cmd_t)(uint32_t);
+
+    /**
+     * Mapping between command IDs and command handling methods.
+     *
+     * @note The order of this vector <i>MUST</i> correspond to the
+     * address space command IDs in the Midgard architecture
+     * specification.
+     */
+    static const std::vector<cmd_t> cmds;
+};
+
+}
+
+#endif // _LIBNOMALIMODEL_ADDRSPACE_HH