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diff --git a/pvr-source/services4/srvkm/env/linux/mutex.c b/pvr-source/services4/srvkm/env/linux/mutex.c
new file mode 100644
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+++ b/pvr-source/services4/srvkm/env/linux/mutex.c
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+/*************************************************************************/ /*!
+@Title          Linux mutex interface
+@Copyright      Copyright (c) Imagination Technologies Ltd. All Rights Reserved
+@License        Dual MIT/GPLv2
+
+The contents of this file are subject to the MIT license as set out below.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+Alternatively, the contents of this file may be used under the terms of
+the GNU General Public License Version 2 ("GPL") in which case the provisions
+of GPL are applicable instead of those above.
+
+If you wish to allow use of your version of this file only under the terms of
+GPL, and not to allow others to use your version of this file under the terms
+of the MIT license, indicate your decision by deleting the provisions above
+and replace them with the notice and other provisions required by GPL as set
+out in the file called "GPL-COPYING" included in this distribution. If you do
+not delete the provisions above, a recipient may use your version of this file
+under the terms of either the MIT license or GPL.
+
+This License is also included in this distribution in the file called
+"MIT-COPYING".
+
+EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
+PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/ /**************************************************************************/
+
+#include <linux/version.h>
+#include <linux/errno.h>
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15))
+#include <linux/mutex.h>
+#else
+#include <asm/semaphore.h>
+#endif
+#include <linux/module.h>
+
+#include <img_defs.h>
+#include <services.h>
+
+#include "mutex.h"
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15))
+
+IMG_VOID LinuxInitMutex(PVRSRV_LINUX_MUTEX *psPVRSRVMutex)
+{
+    mutex_init(psPVRSRVMutex);
+}
+
+IMG_VOID LinuxLockMutex(PVRSRV_LINUX_MUTEX *psPVRSRVMutex)
+{
+    mutex_lock(psPVRSRVMutex);
+}
+
+PVRSRV_ERROR LinuxLockMutexInterruptible(PVRSRV_LINUX_MUTEX *psPVRSRVMutex)
+{
+    if(mutex_lock_interruptible(psPVRSRVMutex) == -EINTR)
+    {
+        return PVRSRV_ERROR_MUTEX_INTERRUPTIBLE_ERROR;
+    }
+    else
+    {
+        return PVRSRV_OK;
+    }
+}
+
+IMG_INT32 LinuxTryLockMutex(PVRSRV_LINUX_MUTEX *psPVRSRVMutex)
+{
+    return mutex_trylock(psPVRSRVMutex);
+}
+
+IMG_VOID LinuxUnLockMutex(PVRSRV_LINUX_MUTEX *psPVRSRVMutex)
+{
+    mutex_unlock(psPVRSRVMutex);
+}
+
+IMG_BOOL LinuxIsLockedMutex(PVRSRV_LINUX_MUTEX *psPVRSRVMutex)
+{
+    return (mutex_is_locked(psPVRSRVMutex)) ? IMG_TRUE : IMG_FALSE;
+}
+
+
+#else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15)) */
+
+
+IMG_VOID LinuxInitMutex(PVRSRV_LINUX_MUTEX *psPVRSRVMutex)
+{
+    init_MUTEX(&psPVRSRVMutex->sSemaphore);
+    atomic_set(&psPVRSRVMutex->Count, 0);
+}
+
+IMG_VOID LinuxLockMutex(PVRSRV_LINUX_MUTEX *psPVRSRVMutex)
+{
+    down(&psPVRSRVMutex->sSemaphore);
+    atomic_dec(&psPVRSRVMutex->Count);
+}
+
+PVRSRV_ERROR LinuxLockMutexInterruptible(PVRSRV_LINUX_MUTEX *psPVRSRVMutex)
+{
+    if(down_interruptible(&psPVRSRVMutex->sSemaphore) == -EINTR)
+    {
+        /* The process was sent a signal while waiting for the semaphore
+         * (e.g. a kill signal from userspace)
+         */
+        return PVRSRV_ERROR_MUTEX_INTERRUPTIBLE_ERROR;
+    }else{
+        atomic_dec(&psPVRSRVMutex->Count);
+        return PVRSRV_OK;
+    }
+}
+
+IMG_INT32 LinuxTryLockMutex(PVRSRV_LINUX_MUTEX *psPVRSRVMutex)
+{
+    IMG_INT32 Status = down_trylock(&psPVRSRVMutex->sSemaphore);
+    if(Status == 0)
+    {
+        atomic_dec(&psPVRSRVMutex->Count);
+    }
+
+    return Status;
+}
+
+IMG_VOID LinuxUnLockMutex(PVRSRV_LINUX_MUTEX *psPVRSRVMutex)
+{
+    atomic_inc(&psPVRSRVMutex->Count);
+    up(&psPVRSRVMutex->sSemaphore);
+}
+
+IMG_BOOL LinuxIsLockedMutex(PVRSRV_LINUX_MUTEX *psPVRSRVMutex)
+{
+    IMG_INT32 iCount;
+    
+    iCount = atomic_read(&psPVRSRVMutex->Count);
+
+    return (IMG_BOOL)iCount;
+}
+
+#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15)) */
+