initial commit, FreeRTOS_BSP_1.0.0_iMX7D

5 files changed, 2355 insertions, 0 deletions

diff --git a/middleware/multicore/open-amp/rpmsg/remote_device.c b/middleware/multicore/open-amp/rpmsg/remote_device.c
new file mode 100644
index 0000000..f07faab
--- /dev/null
+++ b/middleware/multicore/open-amp/rpmsg/remote_device.c
@@ -0,0 +1,534 @@
+/*
+ * Copyright (c) 2014, Mentor Graphics Corporation
+ * All rights reserved.
+ * Copyright (c) 2015 Xilinx, Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of Mentor Graphics Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * 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 HOLDER 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.
+ */
+
+/**************************************************************************
+ * FILE NAME
+ *
+ *       remote_device.c
+ *
+ * COMPONENT
+ *
+ *       OpenAMP Stack
+ *
+ * DESCRIPTION
+ *
+ * This file provides services to manage the remote devices.It also implements
+ * the interface defined by the virtio and provides few other utility functions.
+ *
+ *
+ **************************************************************************/
+
+#include "rpmsg.h"
+
+/* Macro to initialize vring HW info */
+#define INIT_VRING_ALLOC_INFO(ring_info,vring_hw)                             \
+                         (ring_info).phy_addr  = (vring_hw).phy_addr;         \
+                         (ring_info).align     = (vring_hw).align;             \
+                         (ring_info).num_descs = (vring_hw).num_descs
+
+/* Local functions */
+static int rpmsg_rdev_init_channels(struct remote_device *rdev);
+
+/* Ops table for virtio device */
+virtio_dispatch rpmsg_rdev_config_ops =
+{
+    rpmsg_rdev_create_virtqueues,
+    rpmsg_rdev_get_status,
+    rpmsg_rdev_set_status,
+    rpmsg_rdev_get_feature,
+    rpmsg_rdev_set_feature,
+    rpmsg_rdev_negotiate_feature,
+    rpmsg_rdev_read_config,
+    rpmsg_rdev_write_config,
+    rpmsg_rdev_reset
+};
+
+/**
+ * rpmsg_rdev_init
+ *
+ * This function creates and initializes the remote device. The remote device
+ * encapsulates virtio device.
+ *
+ * @param rdev              - pointer to newly created remote device
+ * @param dev-id            - ID of device to create , remote cpu id
+ * @param role              - role of the other device, Master or Remote
+ * @param channel_created   - callback function for channel creation
+ * @param channel_destroyed - callback function for channel deletion
+ * @param default_cb        - default callback for channel
+ *
+ * @return - status of function execution
+ *
+ */
+int rpmsg_rdev_init(struct remote_device **rdev, int dev_id, int role,
+                rpmsg_chnl_cb_t channel_created,
+                rpmsg_chnl_cb_t channel_destroyed,
+                rpmsg_rx_cb_t default_cb) {
+
+    struct remote_device *rdev_loc;
+    struct virtio_device *virt_dev;
+    struct hil_proc *proc;
+    struct proc_shm *shm;
+    int status;
+
+    /* Initialize HIL data structures for given device */
+    proc = hil_create_proc(dev_id);
+
+    if (!proc) {
+        return RPMSG_ERR_DEV_ID;
+    }
+
+    /* Create software representation of remote processor. */
+    rdev_loc = (struct remote_device *) env_allocate_memory(
+                    sizeof(struct remote_device));
+
+    if (!rdev_loc) {
+        return RPMSG_ERR_NO_MEM;
+    }
+
+    env_memset(rdev_loc, 0x00, sizeof(struct remote_device));
+    status = env_create_mutex(&rdev_loc->lock, 1);
+
+    if (status != RPMSG_SUCCESS) {
+
+        /* Cleanup required in case of error is performed by caller */
+        return status;
+    }
+
+    rdev_loc->proc = proc;
+    rdev_loc->role = role;
+    rdev_loc->channel_created = channel_created;
+    rdev_loc->channel_destroyed = channel_destroyed;
+    rdev_loc->default_cb = default_cb;
+
+    /* Initialize the virtio device */
+    virt_dev = &rdev_loc->virt_dev;
+    virt_dev->device = proc;
+    virt_dev->func = &rpmsg_rdev_config_ops;
+    if (virt_dev->func->set_features != RPMSG_NULL) {
+        virt_dev->func->set_features(virt_dev, proc->vdev.dfeatures);   /* rpmsg_rdev_set_feature */
+    }
+
+    /*
+     * Linux don't use this way to manage memory pool
+     */
+    if (rdev_loc->role == RPMSG_REMOTE) {
+        /*
+         * Since device is RPMSG Remote so we need to manage the
+         * shared buffers. Create shared memory pool to handle buffers.
+         */
+        shm = hil_get_shm_info(proc);       /*proc_table*/
+        rdev_loc->mem_pool = sh_mem_create_pool(shm->start_addr, shm->size,
+                        RPMSG_BUFFER_SIZE);
+
+        if (!rdev_loc->mem_pool) {
+            return RPMSG_ERR_NO_MEM;
+        }
+    }
+
+    /* Initialize channels for RPMSG Remote */
+    status = rpmsg_rdev_init_channels(rdev_loc);
+
+    if (status != RPMSG_SUCCESS) {
+        return status;
+    }
+
+    *rdev = rdev_loc;
+
+    return RPMSG_SUCCESS;
+}
+
+/**
+ * rpmsg_rdev_deinit
+ *
+ * This function un-initializes the remote device.
+ *
+ * @param rdev - pointer to remote device to deinit.
+ *
+ * @return - none
+ *
+ */
+void rpmsg_rdev_deinit(struct remote_device *rdev) {
+    struct llist *rp_chnl_head, *rp_chnl_temp, *node;
+    struct rpmsg_channel *rp_chnl;
+
+    rp_chnl_head = rdev->rp_channels;
+
+    while (rp_chnl_head != RPMSG_NULL ) {
+
+        rp_chnl_temp = rp_chnl_head->next;
+        rp_chnl = (struct rpmsg_channel *) rp_chnl_head->data;
+
+        if (rdev->channel_destroyed) {
+            rdev->channel_destroyed(rp_chnl);
+        }
+
+        if ((rdev->support_ns) && (rdev->role == RPMSG_MASTER)) {
+            rpmsg_send_ns_message(rdev, rp_chnl, RPMSG_NS_DESTROY);
+        }
+
+        /* Delete default endpoint for channel */
+        if (rp_chnl->rp_ept) {
+            rpmsg_destroy_ept(rp_chnl->rp_ept);
+        }
+
+        _rpmsg_delete_channel(rp_chnl);
+        rp_chnl_head = rp_chnl_temp;
+    }
+
+    /* Delete name service endpoint */
+    node = rpmsg_rdev_get_endpoint_from_addr(rdev,RPMSG_NS_EPT_ADDR);
+    if (node) {
+        _destroy_endpoint(rdev, (struct rpmsg_endpoint *) node->data);
+    }
+
+    if (rdev->rvq) {
+        virtqueue_free(rdev->rvq);
+    }
+    if (rdev->tvq) {
+        virtqueue_free(rdev->tvq);
+    }
+    if (rdev->mem_pool) {
+        sh_mem_delete_pool(rdev->mem_pool);
+    }
+    if (rdev->lock) {
+        env_delete_mutex(rdev->lock);
+    }
+
+    env_free_memory(rdev);
+}
+
+/**
+ * rpmsg_rdev_get_chnl_node_from_id
+ *
+ * This function returns channel node based on channel name.
+ *
+ * @param stack      - pointer to remote device
+ * @param rp_chnl_id - rpmsg channel name
+ *
+ * @return - channel node
+ *
+ */
+struct llist *rpmsg_rdev_get_chnl_node_from_id(struct remote_device *rdev,
+                char *rp_chnl_id) {
+    struct rpmsg_channel *rp_chnl;
+    struct llist *rp_chnl_head;
+
+    rp_chnl_head = rdev->rp_channels;
+
+    env_lock_mutex(rdev->lock);
+    while (rp_chnl_head) {
+        rp_chnl = (struct rpmsg_channel *) rp_chnl_head->data;
+        if (env_strncmp(rp_chnl->name, rp_chnl_id, sizeof(rp_chnl->name))
+                        == 0) {
+            env_unlock_mutex(rdev->lock);
+            return rp_chnl_head;
+        }
+        rp_chnl_head = rp_chnl_head->next;
+    }
+    env_unlock_mutex(rdev->lock);
+
+    return RPMSG_NULL ;
+}
+
+/**
+ * rpmsg_rdev_get_chnl_from_addr
+ *
+ * This function returns channel node based on src/dst address.
+ *
+ * @param rdev - pointer remote device control block
+ * @param addr - src/dst address
+ *
+ * @return - channel node
+ *
+ */
+struct llist *rpmsg_rdev_get_chnl_from_addr(struct remote_device *rdev,
+                unsigned long addr) {
+    struct rpmsg_channel *rp_chnl;
+    struct llist *rp_chnl_head;
+
+    rp_chnl_head = rdev->rp_channels;
+
+    env_lock_mutex(rdev->lock);
+    while (rp_chnl_head) {
+        rp_chnl = (struct rpmsg_channel *) rp_chnl_head->data;
+        if ((rp_chnl->src == addr) || (rp_chnl->dst == addr)) {
+            env_unlock_mutex(rdev->lock);
+            return rp_chnl_head;
+        }
+        rp_chnl_head = rp_chnl_head->next;
+    }
+    env_unlock_mutex(rdev->lock);
+
+    return RPMSG_NULL ;
+}
+
+/**
+ * rpmsg_rdev_get_endpoint_from_addr
+ *
+ * This function returns endpoint node based on src address.
+ *
+ * @param rdev - pointer remote device control block
+ * @param addr - src address
+ *
+ * @return - endpoint node
+ *
+ */
+struct llist *rpmsg_rdev_get_endpoint_from_addr(struct remote_device *rdev,
+                unsigned long addr) {
+    struct llist *rp_ept_lut_head;
+
+    rp_ept_lut_head = rdev->rp_endpoints;
+
+    env_lock_mutex(rdev->lock);
+    while (rp_ept_lut_head) {
+        struct rpmsg_endpoint *rp_ept =
+                        (struct rpmsg_endpoint *) rp_ept_lut_head->data;
+        if (rp_ept->addr == addr) {
+            env_unlock_mutex(rdev->lock);
+            return rp_ept_lut_head;
+        }
+        rp_ept_lut_head = rp_ept_lut_head->next;
+    }
+    env_unlock_mutex(rdev->lock);
+
+    return RPMSG_NULL ;
+}
+/*
+ * rpmsg_rdev_notify
+ *
+ * This function checks whether remote device is up or not. If it is up then
+ * notification is sent based on device role to start IPC.
+ *
+ * @param rdev - pointer to remote device
+ *
+ * @return - status of function execution
+ *
+ */
+int rpmsg_rdev_notify(struct remote_device *rdev) {
+    int status = RPMSG_SUCCESS;
+
+    if (rdev->role == RPMSG_REMOTE) {
+        status = hil_get_status(rdev->proc);
+
+        /*
+         * Let the remote device know that Master is ready for
+         * communication.
+         */
+        if (!status)
+            virtqueue_kick(rdev->rvq);      /*will triggle rpmsg_tx_callback in the REMOTE side*/
+
+    } else {
+            status = hil_set_status(rdev->proc);
+    }
+
+    if (status == RPMSG_SUCCESS) {
+        rdev->state = RPMSG_DEV_STATE_ACTIVE;
+    }
+
+    return status;
+}
+/**
+ * rpmsg_rdev_init_channels
+ *
+ * This function is only applicable to RPMSG remote. It obtains channel IDs
+ * from the HIL and creates RPMSG channels corresponding to each ID.
+ *
+ * @param rdev - pointer to remote device
+ *
+ * @return  - status of function execution
+ *
+ */
+int rpmsg_rdev_init_channels(struct remote_device *rdev) {
+    struct rpmsg_channel *rp_chnl;
+    struct proc_chnl *chnl_info;
+    int num_chnls, idx;
+
+    if (rdev->role == RPMSG_MASTER) {
+
+        chnl_info = hil_get_chnl_info(rdev->proc, &num_chnls);      /*proc_table*/
+        for (idx = 0; idx < num_chnls; idx++) {
+
+            rp_chnl = _rpmsg_create_channel(rdev, chnl_info[idx].name, 0x00,
+                           RPMSG_NS_EPT_ADDR);      /*the channel is put to "rp_channels" field of remote_device data structure*/
+            if (!rp_chnl) {
+                return RPMSG_ERR_NO_MEM;
+            }
+
+            rp_chnl->rp_ept = rpmsg_create_ept(rp_chnl, rdev->default_cb, rdev,
+                            RPMSG_ADDR_ANY);        /*the endpoint is put ot "rp_endpoints" field of remote_device data structure*/
+
+            if (!rp_chnl->rp_ept) {
+                return RPMSG_ERR_NO_MEM;
+            }
+
+            rp_chnl->src = rp_chnl->rp_ept->addr;       /*channel source is the default endpoint address, destination is NS endpoint address*/
+
+        }
+    }
+
+    return RPMSG_SUCCESS;
+}
+
+/**
+ *------------------------------------------------------------------------
+ * The rest of the file implements the virtio device interface as defined
+ * by the virtio.h file.
+ *------------------------------------------------------------------------
+ */
+int rpmsg_rdev_create_virtqueues(struct virtio_device *dev, int flags, int nvqs,        // invoked by virtio_device->create_virtqueues
+                const char *names[], vq_callback *callbacks[],
+                struct virtqueue *vqs_[]) {
+    struct remote_device *rdev;
+    struct vring_alloc_info ring_info;
+    struct virtqueue *vqs[RPMSG_MAX_VQ_PER_RDEV];
+    struct proc_vring *vring_table;
+    void *buffer;
+    struct llist node;
+    int idx, num_vrings, status;
+
+    rdev = (struct remote_device*) dev;
+
+    /* Get the vring HW info for the given virtio device */
+    vring_table = hil_get_vring_info(&rdev->proc->vdev,
+                    &num_vrings);
+
+
+    if (num_vrings > nvqs) {
+        return RPMSG_ERR_MAX_VQ;
+    }
+
+    /* Create virtqueue for each vring. */
+    for (idx = 0; idx < num_vrings; idx++) {
+
+        INIT_VRING_ALLOC_INFO( ring_info, vring_table[idx]);    /*ring_info comes from proc_table*/
+
+                                                                    /*    
+                                                                     *    - phy_addr
+                                                                     *    - align
+                                                                     *    - num_descs
+                                                                     */
+
+        if (rdev->role == RPMSG_REMOTE) {
+            env_memset((void*) ring_info.phy_addr, 0x00,
+                            vring_size(vring_table[idx].num_descs,
+                                            vring_table[idx].align));
+        }
+
+        /*
+         * created virtqueue should be in vqs[0], vqs[1]
+         */
+        status = virtqueue_create(dev, idx, (char *) names[idx], &ring_info,
+                        callbacks[idx], hil_vring_notify,
+                        &vqs[idx]);
+
+        if (status != RPMSG_SUCCESS) {
+            return status;
+        }
+    }
+
+    //FIXME - a better way to handle this , tx for master is rx for remote and vice versa.
+    /*
+     *              MASTER              REMOTE
+     * vqs[0]       RX                  TX
+     * vqs[1]       TX                  RX
+     */
+    if (rdev->role == RPMSG_MASTER) {
+        rdev->tvq = vqs[0];
+        rdev->rvq = vqs[1];
+    } else {
+        rdev->tvq = vqs[1];
+        rdev->rvq = vqs[0];
+    }
+
+    if (rdev->role == RPMSG_REMOTE) {
+        for (idx = 0; ((idx < rdev->rvq->vq_nentries)
+                        && (idx < rdev->mem_pool->total_buffs / 2));
+                        idx++) {
+
+
+            /* Initialize TX virtqueue buffers for remote device */
+            buffer = sh_mem_get_buffer(rdev->mem_pool);
+
+            if (!buffer) {
+                return RPMSG_ERR_NO_BUFF;
+            }
+
+            node.data = buffer;
+            node.attr = RPMSG_BUFFER_SIZE;
+            node.next = RPMSG_NULL;
+
+            env_memset(buffer, 0x00, RPMSG_BUFFER_SIZE);
+            status = virtqueue_add_buffer(rdev->rvq, &node, 0, 1, buffer);      /* this is where vq_ring.avial.idx is updated by "vq_ring_update_avail"*/
+
+            if (status != RPMSG_SUCCESS) {
+                return status;
+            }
+        }
+    }
+
+    return RPMSG_SUCCESS;
+}
+
+unsigned char rpmsg_rdev_get_status(struct virtio_device *dev) {
+    return 0;
+}
+
+void rpmsg_rdev_set_status(struct virtio_device *dev, unsigned char status) {
+
+}
+
+uint32_t rpmsg_rdev_get_feature(struct virtio_device *dev) {
+    return dev->features;
+}
+
+void rpmsg_rdev_set_feature(struct virtio_device *dev, uint32_t feature) {
+    dev->features |= feature;        /*refer to name service endpoint creation logic in the caller rpmsg_start_ipc*/
+}
+
+uint32_t rpmsg_rdev_negotiate_feature(struct virtio_device *dev,
+                uint32_t features) {
+    return 0;
+}
+/*
+ * Read/write a variable amount from the device specific (ie, network)
+ * configuration region. This region is encoded in the same endian as
+ * the guest.
+ */
+void rpmsg_rdev_read_config(struct virtio_device *dev, uint32_t offset,
+                void *dst, int length) {
+    return;
+}
+void rpmsg_rdev_write_config(struct virtio_device *dev, uint32_t offset,
+                void *src, int length) {
+    return;
+}
+void rpmsg_rdev_reset(struct virtio_device *dev) {
+    return;
+}
diff --git a/middleware/multicore/open-amp/rpmsg/rpmsg.c b/middleware/multicore/open-amp/rpmsg/rpmsg.c
new file mode 100644
index 0000000..66db1ad
--- /dev/null
+++ b/middleware/multicore/open-amp/rpmsg/rpmsg.c
@@ -0,0 +1,424 @@
+/*
+ * Copyright (c) 2014, Mentor Graphics Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of Mentor Graphics Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * 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 HOLDER 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.
+ */
+
+/**************************************************************************
+ * FILE NAME
+ *
+ *       rpmsg.c
+ *
+ * COMPONENT
+ *
+ *       OpenAMP stack.
+ *
+ * DESCRIPTION
+ *
+ * Main file for the RPMSG driver. This file implements APIs as defined by
+ * RPMSG documentation(Linux docs) and also provides some utility functions.
+ *
+ * RPMSG driver represents each processor/core to which it communicates with
+ * remote_device control block.
+ * Each remote device(processor) defines its role in the communication i.e
+ * whether it is RPMSG Master or Remote. If the device (processor) to which
+ * driver is talking is RPMSG master then RPMSG driver implicitly behaves as
+ * Remote and vice versa.
+ * RPMSG Master is responsible for initiating communications with the Remote
+ * and shared buffers management. Terms remote device/core/proc are used
+ * interchangeably for the processor to which RPMSG driver is communicating
+ * irrespective of the fact whether it is RPMSG Remote or Master.
+ *
+ **************************************************************************/
+#include "rpmsg.h"
+
+/**
+ * rpmsg_init
+ *
+ * Thus function allocates and initializes the rpmsg driver resources for
+ * given device ID(cpu id). The successful return from this function leaves
+ * fully enabled IPC link.
+ *
+ * @param dev_id            - remote device for which driver is to
+ *                            be initialized
+ * @param rdev              - pointer to newly created remote device
+ * @param channel_created   - callback function for channel creation
+ * @param channel_destroyed - callback function for channel deletion
+ * @param default_cb        - default callback for channel I/O
+ * @param role              - role of the other device, Master or Remote
+ *
+ * @return - status of function execution
+ *
+ */
+
+int rpmsg_init(int dev_id, struct remote_device **rdev,
+                rpmsg_chnl_cb_t channel_created,
+                rpmsg_chnl_cb_t channel_destroyed,
+                rpmsg_rx_cb_t default_cb, int role) {
+    int status;
+
+    PRINTF("init M4 as %s\r\n", role?"REMOTE":"MASTER");
+    /* Initialize IPC environment */
+    status = env_init();
+    if (status == RPMSG_SUCCESS) {
+        /* Initialize the remote device for given cpu id */
+        status = rpmsg_rdev_init(rdev, dev_id, role, channel_created,
+                        channel_destroyed, default_cb);
+        if (status == RPMSG_SUCCESS) {
+            /* Kick off IPC with the remote device */
+            status = rpmsg_start_ipc(*rdev);
+        }
+    }
+
+    /* Deinit system in case of error */
+    if (status != RPMSG_SUCCESS) {
+        rpmsg_deinit(*rdev);
+    }
+
+    return status;
+}
+
+/**
+ * rpmsg_deinit
+ *
+ * Thus function frees rpmsg driver resources for given remote device.
+ *
+ * @param rdev  -  pointer to device to de-init
+ *
+ */
+
+void rpmsg_deinit(struct remote_device *rdev) {
+    if (rdev) {
+        rpmsg_rdev_deinit(rdev);
+        env_deinit();
+    }
+}
+
+/**
+ * This function sends rpmsg "message" to remote device.
+ *
+ * @param rp_chnl - pointer to rpmsg channel
+ * @param src     - source address of channel
+ * @param dst     - destination address of channel
+ * @param data    - data to transmit
+ * @param size    - size of data
+ * @param wait    - boolean, wait or not for buffer to become
+ *                  available
+ *
+ * @return - status of function execution
+ *
+ */
+
+int rpmsg_send_offchannel_raw(struct rpmsg_channel *rp_chnl, unsigned long src,
+                unsigned long dst, char *data, int size, int wait) {
+    struct remote_device *rdev;
+    struct rpmsg_hdr *rp_hdr;
+    void *buffer;
+    int status = RPMSG_SUCCESS;
+    unsigned short idx;
+    int tick_count = 0;
+    int buff_len;
+
+    if (!rp_chnl) {
+        return RPMSG_ERR_PARAM;
+    }
+
+    /* Get the associated remote device for channel. */
+    rdev = rp_chnl->rdev;
+
+    /* Validate device state */
+    if (rp_chnl->state != RPMSG_CHNL_STATE_ACTIVE
+                    || rdev->state != RPMSG_DEV_STATE_ACTIVE) {
+        return RPMSG_ERR_DEV_STATE;
+    }
+
+    /* Lock the device to enable exclusive access to virtqueues */
+    env_lock_mutex(rdev->lock);
+    /* Get rpmsg buffer for sending message. */
+    buffer = rpmsg_get_tx_buffer(rdev, &buff_len, &idx);
+    if (!buffer && !wait) {
+        status = RPMSG_ERR_NO_MEM;
+    }
+    env_unlock_mutex(rdev->lock);
+
+    if (status == RPMSG_SUCCESS) {
+
+        while (!buffer) {
+            /*
+             * Wait parameter is true - pool the buffer for
+             * 15 secs as defined by the APIs.
+             */
+            env_sleep_msec(RPMSG_TICKS_PER_INTERVAL);
+            env_lock_mutex(rdev->lock);
+            buffer = rpmsg_get_tx_buffer(rdev, &buff_len, &idx);
+            env_unlock_mutex(rdev->lock);
+            tick_count += RPMSG_TICKS_PER_INTERVAL;
+            if (tick_count >= (RPMSG_TICK_COUNT / RPMSG_TICKS_PER_INTERVAL)) {
+                status = RPMSG_ERR_NO_BUFF;
+                break;
+            }
+        }
+
+        if (status == RPMSG_SUCCESS) {
+            //FIXME : may be just copy the data size equal to buffer length and Tx it.
+            if (size > (buff_len - sizeof(struct rpmsg_hdr)))
+                status = RPMSG_ERR_BUFF_SIZE;
+
+            if (status == RPMSG_SUCCESS) {
+                rp_hdr = (struct rpmsg_hdr *) buffer;
+
+                /* Initialize RPMSG header. */
+                rp_hdr->dst = dst;
+                rp_hdr->src = src;
+                rp_hdr->len = size;
+
+                /* Copy data to rpmsg buffer. */
+                env_memcpy(rp_hdr->data, data, size);
+
+                env_lock_mutex(rdev->lock);
+                /* Enqueue buffer on virtqueue. */
+                status = rpmsg_enqueue_buffer(rdev, buffer, buff_len, idx);
+                if (status == RPMSG_SUCCESS) {
+                    /* Let the other side know that there is a job to process. */
+                    virtqueue_kick(rdev->tvq);
+                }
+                env_unlock_mutex(rdev->lock);
+            }
+
+        }
+    }
+
+    /* Do cleanup in case of error.*/
+    if (status != RPMSG_SUCCESS) {
+        rpmsg_free_buffer(rdev, buffer);
+    }
+
+    return status;
+}
+
+/**
+ * rpmsg_get_buffer_size
+ *
+ * Returns buffer size available for sending messages.
+ *
+ * @param channel - pointer to rpmsg channel
+ *
+ * @return - buffer size
+ *
+ */
+int rpmsg_get_buffer_size(struct rpmsg_channel *rp_chnl) {
+    struct remote_device *rdev;
+    int length;
+
+    if (!rp_chnl) {
+        return RPMSG_ERR_PARAM;
+    }
+
+    /* Get associated remote device for channel. */
+    rdev = rp_chnl->rdev;
+
+    /* Validate device state */
+    if (rp_chnl->state != RPMSG_CHNL_STATE_ACTIVE
+                    || rdev->state != RPMSG_DEV_STATE_ACTIVE) {
+        return RPMSG_ERR_DEV_STATE;
+    }
+
+    env_lock_mutex(rdev->lock);
+
+    if (rdev->role == RPMSG_REMOTE) {
+        /*
+         * If device role is Remote then buffers are provided by us
+         * (RPMSG Master), so just provide the macro.
+         */
+        length = RPMSG_BUFFER_SIZE - sizeof(struct rpmsg_hdr);
+    } else {
+        /*
+         * If other core is Master then buffers are provided by it,
+         * so get the buffer size from the virtqueue.
+         */
+        length = (int) virtqueue_get_desc_size(rdev->tvq) - sizeof(struct rpmsg_hdr);
+    }
+
+    env_unlock_mutex(rdev->lock);
+
+    return length;
+}
+
+/**
+ * rpmsg_create_ept
+ *
+ * This function creates rpmsg endpoint for the rpmsg channel.
+ *
+ * @param channel - pointer to rpmsg channel
+ * @param cb      - Rx completion call back
+ * @param priv    - private data
+ * @param addr    - endpoint src address
+ *
+ * @return - pointer to endpoint control block
+ *
+ */
+struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_channel *rp_chnl,
+                rpmsg_rx_cb_t cb, void *priv, unsigned long addr) {
+
+    /*
+     * Note : When calling rpmsg_create_ept to a channel, the endpoint
+     *        is put into info field of remote_device, not the channel
+     *
+     *
+     *        CHANNEL ---> RDEV ---> CHANNELs
+     *
+     *        EPT     ---> RDEV ---> EPTs
+     */
+    struct remote_device *rdev = RPMSG_NULL;
+    struct rpmsg_endpoint *rp_ept = RPMSG_NULL;
+
+    if (!rp_chnl || !cb) {
+        return RPMSG_NULL ;
+    }
+
+    rdev = rp_chnl->rdev;
+
+    rp_ept = _create_endpoint(rdev, cb, priv, addr);
+
+    if (rp_ept) {
+        rp_ept->rp_chnl = rp_chnl;
+    }
+
+    return rp_ept;
+}
+
+/**
+ * rpmsg_destroy_ept
+ *
+ * This function deletes rpmsg endpoint and performs cleanup.
+ *
+ * @param rp_ept - pointer to endpoint to destroy
+ *
+ */
+void rpmsg_destroy_ept(struct rpmsg_endpoint *rp_ept) {
+
+    struct remote_device *rdev;
+    struct rpmsg_channel *rp_chnl;
+
+    if (!rp_ept)
+        return;
+
+    rp_chnl = rp_ept->rp_chnl;
+    rdev = rp_chnl->rdev;
+
+    _destroy_endpoint(rdev, rp_ept);
+}
+
+/**
+ * rpmsg_create_channel
+ *
+ * This function provides facility to create channel dynamically. It sends
+ * Name Service announcement to remote device to let it know about the channel
+ * creation. There must be an active communication among the cores (or atleast
+ * one rpmsg channel must already exist) before using this API to create new
+ * channels.
+ *
+ * @param rdev - pointer to remote device
+ * @param name - channel name
+ *
+ * @return - pointer to new rpmsg channel
+ *
+ */
+struct rpmsg_channel *rpmsg_create_channel(struct remote_device *rdev,
+                char *name) {
+
+    struct rpmsg_channel *rp_chnl;
+    struct rpmsg_endpoint *rp_ept;
+
+    if (!rdev || !name) {
+        return RPMSG_NULL ;
+    }
+
+    /* Create channel instance */
+    rp_chnl = _rpmsg_create_channel(rdev, name, RPMSG_NS_EPT_ADDR,
+                    RPMSG_NS_EPT_ADDR);
+    if (!rp_chnl) {
+        return RPMSG_NULL ;
+    }
+
+    /* Create default endpoint for the channel */
+    rp_ept = rpmsg_create_ept(rp_chnl , rdev->default_cb, rdev,
+                    RPMSG_ADDR_ANY);
+
+    if (!rp_ept) {
+        _rpmsg_delete_channel(rp_chnl);
+        return RPMSG_NULL;
+    }
+
+    rp_chnl->rp_ept = rp_ept;
+    rp_chnl->src = rp_ept->addr;
+    rp_chnl->state = RPMSG_CHNL_STATE_NS;
+
+    /* Notify the application of channel creation event */
+    if (rdev->channel_created) {
+        rdev->channel_created(rp_chnl);
+    }
+
+    /* Send NS announcement to remote processor */
+    rpmsg_send_ns_message(rdev, rp_chnl, RPMSG_NS_CREATE);
+
+    return rp_chnl;
+}
+
+/**
+ * rpmsg_delete_channel
+ *
+ * Deletes the given RPMSG channel. The channel must first be created with the
+ * rpmsg_create_channel API.
+ *
+ * @param rp_chnl - pointer to rpmsg channel to delete
+ *
+ */
+void rpmsg_delete_channel(struct rpmsg_channel *rp_chnl) {
+
+    struct remote_device *rdev;
+
+    if (!rp_chnl) {
+        return;
+    }
+
+    rdev = rp_chnl->rdev;
+
+    if (rp_chnl->state > RPMSG_CHNL_STATE_IDLE) {
+        /* Notify the other processor that channel no longer exists */
+        rpmsg_send_ns_message(rdev, rp_chnl, RPMSG_NS_DESTROY);
+    }
+
+    /* Notify channel deletion to application */
+    if (rdev->channel_destroyed) {
+        rdev->channel_destroyed(rp_chnl);
+    }
+
+    rpmsg_destroy_ept(rp_chnl->rp_ept);
+    _rpmsg_delete_channel(rp_chnl);
+
+    return;
+}
diff --git a/middleware/multicore/open-amp/rpmsg/rpmsg.h b/middleware/multicore/open-amp/rpmsg/rpmsg.h
new file mode 100644
index 0000000..746b792
--- /dev/null
+++ b/middleware/multicore/open-amp/rpmsg/rpmsg.h
@@ -0,0 +1,411 @@
+/*
+ * Remote processor messaging
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * 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 Texas Instruments nor the names of its
+ *   contributors may be used to endorse or promote products derived
+ *   from this software without specific prior written permission.
+ *
+ * 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.
+ */
+
+#ifndef _RPMSG_H_
+#define _RPMSG_H_
+
+#include "../rpmsg/rpmsg_core.h"
+
+/* The feature bitmap for virtio rpmsg */
+#define VIRTIO_RPMSG_F_NS	0 /* RP supports name service notifications */
+#define RPMSG_NAME_SIZE     32
+
+/**
+ * struct rpmsg_hdr - common header for all rpmsg messages
+ * @src: source address
+ * @dst: destination address
+ * @reserved: reserved for future use
+ * @len: length of payload (in bytes)
+ * @flags: message flags
+ * @data: @len bytes of message payload data
+ *
+ * Every message sent(/received) on the rpmsg bus begins with this header.
+ */
+struct rpmsg_hdr {
+	unsigned long src;
+	unsigned long dst;
+	unsigned long reserved;
+	unsigned short len;
+	unsigned short flags;
+	unsigned char data[0];
+} /*__attribute__((packed))*/;
+
+/**
+ * struct rpmsg_ns_msg - dynamic name service announcement message
+ * @name: name of remote service that is published
+ * @addr: address of remote service that is published
+ * @flags: indicates whether service is created or destroyed
+ *
+ * This message is sent across to publish a new service, or announce
+ * about its removal. When we receive these messages, an appropriate
+ * rpmsg channel (i.e device) is created/destroyed. In turn, the ->probe()
+ * or ->remove() handler of the appropriate rpmsg driver will be invoked
+ * (if/as-soon-as one is registered).
+ */
+struct rpmsg_ns_msg {
+	char name[RPMSG_NAME_SIZE];
+	unsigned long addr;
+	unsigned long flags;
+} /*__attribute__((packed))*/;
+
+/**
+ * enum rpmsg_ns_flags - dynamic name service announcement flags
+ *
+ * @RPMSG_NS_CREATE: a new remote service was just created
+ * @RPMSG_NS_DESTROY: a known remote service was just destroyed
+ */
+enum rpmsg_ns_flags {
+	RPMSG_NS_CREATE		= 0,
+	RPMSG_NS_DESTROY	= 1,
+};
+
+#define RPMSG_ADDR_ANY		0xFFFFFFFF
+
+
+/**
+ * rpmsg_channel - devices that belong to the rpmsg bus are called channels
+ * @name: channel name
+ * @src: local address
+ * @dst: destination address
+ * rdev: rpmsg remote device
+ * @ept: the rpmsg endpoint of this channel
+ * @state: channel state
+ */
+struct rpmsg_channel {
+    char name[RPMSG_NAME_SIZE];
+    unsigned long src;
+    unsigned long dst;
+    struct remote_device *rdev;
+    struct rpmsg_endpoint *rp_ept;
+    unsigned int state;
+};
+
+/**
+ * channel_info - channel info
+ * @name: channel name
+ * @src: local address
+ * @dst: destination address
+ */
+
+struct channel_info {
+    char name[RPMSG_NAME_SIZE];
+    unsigned long src;
+    unsigned long dest;
+};
+
+/**
+ * struct rpmsg_endpoint - binds a local rpmsg address to its user
+ * @rp_chnl: rpmsg channel device
+ * @cb: rx callback handler
+ * @addr: local rpmsg address
+ * @priv: private data for the driver's use
+ *
+ * In essence, an rpmsg endpoint represents a listener on the rpmsg bus, as
+ * it binds an rpmsg address with an rx callback handler.
+ *
+ * Simple rpmsg drivers shouldn't use this struct directly, because
+ * things just work: every rpmsg driver provides an rx callback upon
+ * registering to the bus, and that callback is then bound to its rpmsg
+ * address when the driver is probed. When relevant inbound messages arrive
+ * (i.e. messages which their dst address equals to the src address of
+ * the rpmsg channel), the driver's handler is invoked to process it.
+ *
+ * More complicated drivers though, that do need to allocate additional rpmsg
+ * addresses, and bind them to different rx callbacks, must explicitly
+ * create additional endpoints by themselves (see rpmsg_create_ept()).
+ */
+struct rpmsg_endpoint {
+    struct rpmsg_channel *rp_chnl;
+    rpmsg_rx_cb_t cb;
+    unsigned long addr;
+    void *priv;
+};
+
+struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_channel *rp_chnl,
+                rpmsg_rx_cb_t cb, void *priv, unsigned long addr);
+
+void rpmsg_destroy_ept(struct rpmsg_endpoint *rp_ept);
+
+int
+rpmsg_send_offchannel_raw(struct rpmsg_channel *, unsigned long, unsigned long, char *, int, int);
+
+/**
+ * rpmsg_sendto() - send a message across to the remote processor, specify dst
+ * @rpdev: the rpmsg channel
+ * @data: payload of message
+ * @len: length of payload
+ * @dst: destination address
+ *
+ * This function sends @data of length @len to the remote @dst address.
+ * The message will be sent to the remote processor which the @rpdev
+ * channel belongs to, using @rpdev's source address.
+ * In case there are no TX buffers available, the function will block until
+ * one becomes available, or a timeout of 15 seconds elapses. When the latter
+ * happens, -ERESTARTSYS is returned.
+ *
+ * Can only be called from process context (for now).
+ *
+ * Returns 0 on success and an appropriate error value on failure.
+ */
+static inline
+int rpmsg_sendto(struct rpmsg_channel *rpdev, void *data, int len, unsigned long dst)
+{
+    if (!rpdev || !data)
+        return RPMSG_ERR_PARAM;
+
+    return rpmsg_send_offchannel_raw(rpdev, rpdev->src, dst, (char *)data, len, RPMSG_TRUE);
+}
+
+/**
+ * rpmsg_send() - send a message across to the remote processor
+ * @rpdev: the rpmsg channel
+ * @data: payload of message
+ * @len: length of payload
+ *
+ * This function sends @data of length @len on the @rpdev channel.
+ * The message will be sent to the remote processor which the @rpdev
+ * channel belongs to, using @rpdev's source and destination addresses.
+ * In case there are no TX buffers available, the function will block until
+ * one becomes available, or a timeout of 15 seconds elapses. When the latter
+ * happens, -ERESTARTSYS is returned.
+ *
+ * Can only be called from process context (for now).
+ *
+ * Returns 0 on success and an appropriate error value on failure.
+ */
+static inline int rpmsg_send(struct rpmsg_channel *rpdev, void *data, int len)
+{
+    if (!rpdev || !data)
+        return RPMSG_ERR_PARAM;
+
+    return rpmsg_send_offchannel_raw(rpdev, rpdev->src, rpdev->dst, (char*)data, len, RPMSG_TRUE);
+}
+
+/**
+ * rpmsg_send_offchannel() - send a message using explicit src/dst addresses
+ * @rpdev: the rpmsg channel
+ * @src: source address
+ * @dst: destination address
+ * @data: payload of message
+ * @len: length of payload
+ *
+ * This function sends @data of length @len to the remote @dst address,
+ * and uses @src as the source address.
+ * The message will be sent to the remote processor which the @rpdev
+ * channel belongs to.
+ * In case there are no TX buffers available, the function will block until
+ * one becomes available, or a timeout of 15 seconds elapses. When the latter
+ * happens, -ERESTARTSYS is returned.
+ *
+ * Can only be called from process context (for now).
+ *
+ * Returns 0 on success and an appropriate error value on failure.
+ */
+static inline
+int rpmsg_send_offchannel(struct rpmsg_channel *rpdev, unsigned long src, unsigned long dst,
+							void *data, int len)
+{
+    if (!rpdev || !data)
+        return RPMSG_ERR_PARAM;
+
+    return rpmsg_send_offchannel_raw(rpdev, src, dst, (char *)data, len, RPMSG_TRUE);
+}
+
+/**
+ * rpmsg_trysend() - send a message across to the remote processor
+ * @rpdev: the rpmsg channel
+ * @data: payload of message
+ * @len: length of payload
+ *
+ * This function sends @data of length @len on the @rpdev channel.
+ * The message will be sent to the remote processor which the @rpdev
+ * channel belongs to, using @rpdev's source and destination addresses.
+ * In case there are no TX buffers available, the function will immediately
+ * return -ENOMEM without waiting until one becomes available.
+ *
+ * Can only be called from process context (for now).
+ *
+ * Returns 0 on success and an appropriate error value on failure.
+ */
+static inline
+int rpmsg_trysend(struct rpmsg_channel *rpdev, void *data, int len)
+{
+
+    if (!rpdev || !data)
+        return RPMSG_ERR_PARAM;
+
+	return rpmsg_send_offchannel_raw(rpdev, rpdev->src, rpdev->dst, (char *)data, len, RPMSG_FALSE);
+}
+
+/**
+ * rpmsg_trysendto() - send a message across to the remote processor, specify dst
+ * @rpdev: the rpmsg channel
+ * @data: payload of message
+ * @len: length of payload
+ * @dst: destination address
+ *
+ * This function sends @data of length @len to the remote @dst address.
+ * The message will be sent to the remote processor which the @rpdev
+ * channel belongs to, using @rpdev's source address.
+ * In case there are no TX buffers available, the function will immediately
+ * return -ENOMEM without waiting until one becomes available.
+ *
+ * Can only be called from process context (for now).
+ *
+ * Returns 0 on success and an appropriate error value on failure.
+ */
+static inline
+int rpmsg_trysendto(struct rpmsg_channel *rpdev, void *data, int len, unsigned long dst)
+{
+    unsigned long src;
+
+    if (!rpdev || !data)
+        return RPMSG_ERR_PARAM;
+
+    src = rpdev->src;
+
+	return rpmsg_send_offchannel_raw(rpdev, src, dst, (char *)data, len, RPMSG_FALSE);
+}
+
+/**
+ * rpmsg_trysend_offchannel() - send a message using explicit src/dst addresses
+ * @rpdev: the rpmsg channel
+ * @src: source address
+ * @dst: destination address
+ * @data: payload of message
+ * @len: length of payload
+ *
+ * This function sends @data of length @len to the remote @dst address,
+ * and uses @src as the source address.
+ * The message will be sent to the remote processor which the @rpdev
+ * channel belongs to.
+ * In case there are no TX buffers available, the function will immediately
+ * return -ENOMEM without waiting until one becomes available.
+ *
+ * Can only be called from process context (for now).
+ *
+ * Returns 0 on success and an appropriate error value on failure.
+ */
+static inline
+int rpmsg_trysend_offchannel(struct rpmsg_channel *rpdev, unsigned long src, unsigned long dst,
+							void *data, int len)
+{
+	if (!rpdev || !data)
+	    return RPMSG_ERR_PARAM;
+
+    return rpmsg_send_offchannel_raw(rpdev, src, dst, (char *)data, len, RPMSG_FALSE);
+}
+
+/**
+ * rpmsg_init
+ *
+ * Thus function allocates and initializes the rpmsg driver resources for given
+ * device id (cpu id).The successful return from this function leaves
+ * fully enabled IPC link.
+ *
+ * @param dev_id            - rpmsg remote device for which driver is to
+ *                            be initialized
+ * @param rdev              - pointer to newly created remote device
+ * @param channel_created   - callback function for channel creation
+ * @param channel_destroyed - callback function for channel deletion
+ * @default_cb              - default callback for channel
+ * @param role              - role of the other device, Master or Remote
+ * @return - status of function execution
+ *
+ */
+
+int rpmsg_init(int dev_id, struct remote_device **rdev,
+               rpmsg_chnl_cb_t channel_created,
+               rpmsg_chnl_cb_t channel_destroyed,
+               rpmsg_rx_cb_t default_cb, int role);
+
+/**
+ * rpmsg_deinit
+ *
+ * Thus function releases the rpmsg driver resources for given remote
+ * instance.
+ *
+ * @param rdev  -  pointer to device de-init
+ *
+ * @return - none
+ *
+ */
+void rpmsg_deinit(struct remote_device *rdev);
+
+/**
+ * rpmsg_get_buffer_size
+ *
+ * Returns buffer size available for sending messages.
+ *
+ * @param channel - pointer to rpmsg channel/device
+ *
+ * @return - buffer size
+ *
+ */
+int rpmsg_get_buffer_size(struct rpmsg_channel *rp_chnl);
+
+/**
+ * rpmsg_create_channel
+ *
+ * Creates RPMSG channel with the given name for remote device.
+ *
+ * @param rdev - pointer to rpmsg remote device
+ * @param name - channel name
+ *
+ * @return - pointer to new rpmsg channel
+ *
+ */
+struct rpmsg_channel *rpmsg_create_channel(struct remote_device *rdev, char *name);
+
+/**
+ * rpmsg_delete_channel
+ *
+ * Deletes the given RPMSG channel. The channel must first be created with the
+ * rpmsg_create_channel API.
+ *
+ * @param rp_chnl - pointer to rpmsg channel to delete
+ *
+ */
+void rpmsg_delete_channel(struct rpmsg_channel *rp_chnl);
+
+/**
+ *
+ * rpmsg_handler
+ *
+ * Provide platform specific interrupt handler to application layer
+ *
+ */
+void rpmsg_handler(void);
+
+#endif /* _RPMSG_H_ */
diff --git a/middleware/multicore/open-amp/rpmsg/rpmsg_core.c b/middleware/multicore/open-amp/rpmsg/rpmsg_core.c
new file mode 100644
index 0000000..c8cb82f
--- /dev/null
+++ b/middleware/multicore/open-amp/rpmsg/rpmsg_core.c
@@ -0,0 +1,796 @@
+/*
+ * Copyright (c) 2014, Mentor Graphics Corporation
+ * All rights reserved.
+ * Copyright (c) 2015 Xilinx, Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of Mentor Graphics Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * 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 HOLDER 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.
+ */
+
+/**************************************************************************
+ * FILE NAME
+ *
+ *       rpmsg_core.c
+ *
+ * COMPONENT
+ *
+ *       OpenAMP
+ *
+ * DESCRIPTION
+ *
+ * This file provides the core functionality of RPMSG messaging part like
+ * message parsing ,Rx/Tx callbacks handling , channel creation/deletion
+ * and address management.
+ *
+ *
+ **************************************************************************/
+#include "rpmsg.h"
+
+/* Internal functions */
+static void rpmsg_rx_callback(struct virtqueue *vq);
+static void rpmsg_tx_callback(struct virtqueue *vq);
+
+/**
+ * rpmsg_start_ipc
+ *
+ * This function creates communication links(virtqueues) for remote device
+ * and notifies it to start IPC.
+ *
+ * @param rdev - remote device handle
+ *
+ * @return - status of function execution
+ *
+ */
+int rpmsg_start_ipc(struct remote_device *rdev) {
+    struct virtio_device *virt_dev;
+    struct rpmsg_endpoint *ns_ept;
+    void (*callback[2])(struct virtqueue *vq);
+    const char *vq_names[2];
+    unsigned long dev_features;
+    int status;
+    struct virtqueue *vqs[2];
+    int i;
+
+    virt_dev = &rdev->virt_dev;
+
+    /* Initialize names and callbacks based on the device role */
+    /*
+     *                  virtqueue[0]                            virtqueue[1]
+     *      MASTER      "tx_vq", "rpmsg_tx_callback"            "rx_vq", "rpmsg_rx_callback"
+     *
+     *      REMOTE      "rx_vq", "rpmsg_rx_callback"            "tx_vq", "rpmsg_tx_callback"
+     */
+    if (rdev->role == RPMSG_MASTER) {
+        vq_names[0] = "tx_vq";
+        vq_names[1] = "rx_vq";
+        callback[0] = rpmsg_tx_callback;
+        callback[1] = rpmsg_rx_callback;
+    } else {
+        vq_names[0] = "rx_vq";
+        vq_names[1] = "tx_vq";
+        callback[0] = rpmsg_rx_callback;
+        callback[1] = rpmsg_tx_callback;
+    }
+
+    /* Create virtqueues for remote device */
+    /*
+     * the 2 created virtqueues are assigned to rdev's tvq and rvq respectively
+     * regarding on the MATER/REMOTE role
+     *
+     * REMOTE:  proc_table.vring_info[0]   "tx_vq"     "rpmsg_tx_callback"     "rdev->tvq" -> "vqs[0]"
+     *          proc_table.vring_info[1]   "rx_vq"     "rpmsg_rx_callback"     "rdev->rvq" -> "vqs[1]"
+     * MASTER:  proc_table.vring_info[0]   "rx_vq"     "rpmsg_rx_callback"     "rdev->rvq" -> "vqs[0]"
+     *          proc_table.vring_info[1]   "tx_vq"     "rpmsg_tx_callback"     "rdev->tvq" -> "vqs[1]"
+     */
+    status = virt_dev->func->create_virtqueues(virt_dev, 0,                 /*rpmsg_rdev_create_virtqueues*/
+                    RPMSG_MAX_VQ_PER_RDEV, vq_names, callback, RPMSG_NULL);
+    if (status != RPMSG_SUCCESS) {
+        return status;
+    }
+
+    dev_features = virt_dev->func->get_features(virt_dev);                  /*rpmsg_rdev_get_feature*/
+
+    /*
+     * Create name service announcement endpoint if device supports name
+     * service announcement feature.
+     */
+    if ((dev_features & (1<<VIRTIO_RPMSG_F_NS))) {
+        rdev->support_ns = RPMSG_TRUE;
+        ns_ept = _create_endpoint(rdev, rpmsg_ns_callback, rdev,            /* Is this necessary for a remote? */
+                        RPMSG_NS_EPT_ADDR);
+        if (!ns_ept) {
+            return RPMSG_ERR_NO_MEM;
+        }
+    }
+
+    /* Initialize notifications for vring. */
+     if (rdev->role == RPMSG_MASTER) {
+        vqs[0] = rdev->tvq;
+        vqs[1] = rdev->rvq;
+    } else {
+        vqs[0] = rdev->rvq;
+        vqs[1] = rdev->tvq;
+    }
+    for(i = 0; i <= 1; i++) {
+        status = hil_enable_vring_notifications(i, vqs[i]);
+        if (status != RPMSG_SUCCESS) {
+            return status;
+        }
+    }
+
+    status = rpmsg_rdev_notify(rdev);
+
+    return status;
+}
+
+/**
+ * _rpmsg_create_channel
+ *
+ * Creates new rpmsg channel with the given parameters.
+ *
+ * @param rdev - pointer to remote device which contains the channel
+ * @param name - name of the device
+ * @param src  - source address for the rpmsg channel
+ * @param dst  - destination address for the rpmsg channel
+ *
+ * @return - pointer to new rpmsg channel
+ *
+ */
+struct rpmsg_channel *_rpmsg_create_channel(struct remote_device *rdev,
+                char *name, unsigned long src, unsigned long dst) {
+    struct rpmsg_channel *rp_chnl;
+    struct llist *node;
+
+    rp_chnl = env_allocate_memory(sizeof(struct rpmsg_channel));
+    if (rp_chnl) {
+        env_memset(rp_chnl, 0x00, sizeof(struct rpmsg_channel));
+        env_strncpy(rp_chnl->name, name, sizeof(rp_chnl->name));
+        rp_chnl->src = src;
+        rp_chnl->dst = dst;
+        rp_chnl->rdev = rdev;
+        /* Place channel on channels list */
+        node = env_allocate_memory(sizeof(struct llist));
+        if (!node) {
+            env_free_memory(rp_chnl);
+            return RPMSG_NULL ;
+        }
+        node->data = rp_chnl;
+        env_lock_mutex(rdev->lock);
+        add_to_list(&rdev->rp_channels , node);
+        env_unlock_mutex(rdev->lock);
+    }
+
+    return rp_chnl;
+}
+
+/**
+ * _rpmsg_delete_channel
+ *
+ * Deletes given rpmsg channel.
+ *
+ * @param rp_chnl -  pointer to rpmsg channel to delete
+ *
+ * return - none
+ */
+void _rpmsg_delete_channel(struct rpmsg_channel * rp_chnl) {
+    struct llist *node;
+    if (rp_chnl) {
+        node = rpmsg_rdev_get_chnl_node_from_id(rp_chnl->rdev, rp_chnl->name);
+        if (node) {
+            env_lock_mutex(rp_chnl->rdev->lock);
+            remove_from_list(&rp_chnl->rdev->rp_channels, node);
+            env_unlock_mutex(rp_chnl->rdev->lock);
+            env_free_memory(node);
+        }
+        env_free_memory(rp_chnl);
+    }
+}
+
+/**
+ * _create_endpoint
+ *
+ * This function creates rpmsg endpoint.
+ *
+ * @param rdev    - pointer to remote device
+ * @param cb      - Rx completion call back
+ * @param priv    - private data
+ * @param addr    - endpoint src address
+ *
+ * @return - pointer to endpoint control block
+ *
+ */
+struct rpmsg_endpoint *_create_endpoint(struct remote_device *rdev,
+                rpmsg_rx_cb_t cb, void *priv, unsigned long addr) {
+
+    struct rpmsg_endpoint *rp_ept;
+    struct llist *node;
+    int status = RPMSG_SUCCESS;
+
+    rp_ept = env_allocate_memory(sizeof(struct rpmsg_endpoint));
+    if (!rp_ept) {
+        return RPMSG_NULL ;
+    }
+
+    node = env_allocate_memory(sizeof(struct llist));
+    if (!node) {
+        env_free_memory(rp_ept);
+        return RPMSG_NULL;
+    }
+
+    env_lock_mutex(rdev->lock);
+
+    if (addr != RPMSG_ADDR_ANY) {
+        /*
+         * Application has requested a particular src address for endpoint,
+         * first check if address is available.
+         */
+        if (!rpmsg_is_address_set(rdev->bitmap, RPMSG_ADDR_BMP_SIZE, addr)) {
+            /* Mark the address as used in the address bitmap. */
+            rpmsg_set_address(rdev->bitmap, RPMSG_ADDR_BMP_SIZE, addr);
+
+        } else {
+            status = RPMSG_ERR_DEV_ADDR;
+        }
+    } else {
+        addr = rpmsg_get_address(rdev->bitmap, RPMSG_ADDR_BMP_SIZE);
+        if (addr < 0) {
+            status = RPMSG_ERR_DEV_ADDR;
+        }
+    }
+
+    /* Do cleanup in case of error and return */
+    if (status) {
+        env_free_memory(node);
+        env_free_memory(rp_ept);
+        env_unlock_mutex(rdev->lock);
+        return RPMSG_NULL;
+    }
+
+    rp_ept->addr = addr;
+    rp_ept->cb = cb;
+    rp_ept->priv = priv;
+
+    node->data = rp_ept;
+    add_to_list(&rdev->rp_endpoints, node);
+
+    env_unlock_mutex(rdev->lock);
+
+    return rp_ept;
+}
+
+/**
+ * rpmsg_destroy_ept
+ *
+ * This function deletes rpmsg endpoint and performs cleanup.
+ *
+ * @param rdev   - pointer to remote device
+ * @param rp_ept - pointer to endpoint to destroy
+ *
+ */
+void _destroy_endpoint(struct remote_device *rdev,
+                struct rpmsg_endpoint *rp_ept) {
+    struct llist *node;
+    node = rpmsg_rdev_get_endpoint_from_addr(rdev, rp_ept->addr);
+    if (node) {
+        env_lock_mutex(rdev->lock);
+        rpmsg_release_address(rdev->bitmap, RPMSG_ADDR_BMP_SIZE, rp_ept->addr);
+        remove_from_list(&rdev->rp_endpoints, node);
+        env_unlock_mutex(rdev->lock);
+        env_free_memory(node);
+    }
+    env_free_memory(rp_ept);
+}
+
+/**
+ * rpmsg_send_ns_message
+ *
+ * Sends name service announcement to remote device
+ *
+ * @param rdev    - pointer to remote device
+ * @param rp_chnl - pointer to rpmsg channel
+ * @param flags   - Channel creation/deletion flags
+ *
+ */
+void rpmsg_send_ns_message(struct remote_device *rdev,
+                struct rpmsg_channel *rp_chnl, unsigned long flags) {
+
+    struct rpmsg_hdr *rp_hdr;
+    struct rpmsg_ns_msg *ns_msg;
+    unsigned short idx;
+    int len;
+
+    env_lock_mutex(rdev->lock);
+
+    /* Get Tx buffer. */
+    rp_hdr = (struct rpmsg_hdr *) rpmsg_get_tx_buffer(rdev, &len, &idx);
+    if (!rp_hdr)
+        return;
+
+    /* Fill out name service data. */
+    rp_hdr->dst = RPMSG_NS_EPT_ADDR;
+    rp_hdr->len = sizeof(struct rpmsg_ns_msg);
+    ns_msg = (struct rpmsg_ns_msg *) rp_hdr->data;
+    env_strncpy(ns_msg->name, rp_chnl->name, sizeof(rp_chnl->name));
+    ns_msg->flags = flags;
+    ns_msg->addr = rp_chnl->src;
+
+    /* Place the buffer on virtqueue. */
+    rpmsg_enqueue_buffer(rdev, rp_hdr, len, idx);
+
+    /* Notify the other side that it has data to process. */
+    virtqueue_kick(rdev->tvq);
+
+    env_unlock_mutex(rdev->lock);
+}
+
+/**
+ * rpmsg_enqueue_buffers
+ *
+ * Places buffer on the virtqueue for consumption by the other side.
+ *
+ * @param rdev   - pointer to remote core
+ * @param buffer - buffer pointer
+ * @param len    - buffer length
+ * @idx          - buffer index
+ *
+ * @return - status of function execution
+ *
+ */
+int rpmsg_enqueue_buffer(struct remote_device *rdev, void *buffer,
+                unsigned long len, unsigned short idx) {
+    struct llist node;
+    int status;
+
+    /* Initialize buffer node */
+    node.data = buffer;
+    node.attr = len;
+    node.next = RPMSG_NULL;
+    node.prev = RPMSG_NULL;
+
+    if (rdev->role == RPMSG_REMOTE) {
+        /*MASTER*/
+        status = virtqueue_add_buffer(rdev->tvq, &node, 0, 1, buffer);
+    } else {
+        /*REMOTE*/
+        status = virtqueue_add_consumed_buffer(rdev->tvq, idx, len);
+    }
+
+    return status;
+}
+
+/**
+ * rpmsg_return_buffer
+ *
+ * Places the used buffer back on the virtqueue.
+ *
+ * @param rdev   - pointer to remote core
+ * @param buffer - buffer pointer
+ * @param len    - buffer length
+ * @param idx    - buffer index
+ *
+ */
+void rpmsg_return_buffer(struct remote_device *rdev, void *buffer,
+                unsigned long len, unsigned short idx) {
+    struct llist node;
+
+    /* Initialize buffer node */
+    node.data = buffer;
+    node.attr = len;
+    node.next = RPMSG_NULL;
+    node.prev = RPMSG_NULL;
+
+    if (rdev->role == RPMSG_REMOTE) {
+        /*master*/
+        virtqueue_add_buffer(rdev->rvq, &node, 0, 1, buffer);
+    } else {
+        /*remote*/
+        virtqueue_add_consumed_buffer(rdev->rvq, idx, len);
+    }
+}
+
+/**
+ * rpmsg_get_tx_buffer
+ *
+ * Provides buffer to transmit messages.
+ *
+ * @param rdev - pointer to remote device
+ * @param len  - length of returned buffer
+ * @param idx  - buffer index
+ *
+ * return - pointer to buffer.
+ */
+void *rpmsg_get_tx_buffer(struct remote_device *rdev, int *len,
+                unsigned short *idx) {
+    void *data;
+
+    if (rdev->role == RPMSG_REMOTE) {
+        /* MASTER */
+        data = virtqueue_get_buffer(rdev->tvq, (uint32_t *) len);
+        if (data == RPMSG_NULL) {
+            /*Here is why Master don't need to pre link memory to vring*/
+            data = sh_mem_get_buffer(rdev->mem_pool);
+            *len = RPMSG_BUFFER_SIZE;
+        }
+    } else {
+        /* REMOTE */
+        data = virtqueue_get_available_buffer(rdev->tvq, idx,
+                        (uint32_t *) len);
+    }
+    return ((void *) env_map_vatopa(data));
+}
+
+/**
+ * rpmsg_get_rx_buffer
+ *
+ * Retrieves the received buffer from the virtqueue.
+ *
+ * @param rdev - pointer to remote device
+ * @param len  - size of received buffer
+ * @param idx  - index of buffer
+ *
+ * @return - pointer to received buffer
+ *
+ */
+void *rpmsg_get_rx_buffer(struct remote_device *rdev, unsigned long *len,
+                unsigned short *idx) {
+
+    void *data;
+    if (rdev->role == RPMSG_REMOTE) {
+        /*MASTER*/
+        data = virtqueue_get_buffer(rdev->rvq, (uint32_t *)len);
+    } else {
+        /*REMOTE*/
+        data = virtqueue_get_available_buffer(rdev->rvq, idx, (uint32_t *)len);
+    }
+    return ((void *) env_map_vatopa(data));
+}
+
+/**
+ * rpmsg_free_buffer
+ *
+ * Frees the allocated buffers.
+ *
+ * @param rdev   - pointer to remote device
+ * @param buffer - pointer to buffer to free
+ *
+ */
+void rpmsg_free_buffer(struct remote_device *rdev, void *buffer) {
+    if (rdev->role == RPMSG_REMOTE) {
+        sh_mem_free_buffer(rdev->mem_pool, buffer);
+    }
+}
+
+/**
+ * rpmsg_tx_callback
+ *
+ * Tx callback function.
+ *
+ * @param vq - pointer to virtqueue on which Tx is has been
+ *             completed.
+ *
+ */
+static void rpmsg_tx_callback(struct virtqueue *vq) {
+    struct remote_device *rdev;
+    struct virtio_device *vdev;
+    struct rpmsg_channel *rp_chnl;
+    struct llist *chnl_hd;
+
+    vdev = (struct virtio_device *) vq->vq_dev;
+    rdev = (struct remote_device *) vdev;
+    chnl_hd = rdev->rp_channels;
+
+    /* Check if the remote device is master. */
+    if (rdev->role == RPMSG_MASTER) {
+        /* Notification is received from the master. Now the remote(us) can
+         * performs one of two operations;
+         *
+         * a. If name service announcement is supported then it will send NS message.
+         *    else
+         * b. It will update the channel state to active so that further communication
+         *    can take place.
+         */
+        while (chnl_hd != RPMSG_NULL) {
+            rp_chnl = (struct rpmsg_channel *) chnl_hd->data;
+
+            if (rp_chnl->state == RPMSG_CHNL_STATE_IDLE) {
+
+                if (rdev->support_ns) {
+                    rp_chnl->state = RPMSG_CHNL_STATE_NS;
+                } else {
+                    rp_chnl->state = RPMSG_CHNL_STATE_ACTIVE;
+                }
+
+                if (rp_chnl->state == RPMSG_CHNL_STATE_NS) {
+                    rpmsg_send_ns_message(rdev, rp_chnl, RPMSG_NS_CREATE);
+                }
+            }
+
+            chnl_hd = chnl_hd->next;
+        }
+    }
+}
+
+/**
+ * rpmsg_rx_callback
+ *
+ * Rx callback function.
+ *
+ * @param vq - pointer to virtqueue on which messages is received
+ *
+ */
+void rpmsg_rx_callback(struct virtqueue *vq) {
+    struct remote_device *rdev;
+    struct virtio_device *vdev;
+    struct rpmsg_channel *rp_chnl;
+    struct rpmsg_endpoint *rp_ept;
+    struct rpmsg_hdr *rp_hdr;
+    struct llist *node;
+    unsigned long len;
+    unsigned short idx;
+    struct llist *chnl_hd;
+
+    vdev = (struct virtio_device *) vq->vq_dev;
+    rdev = (struct remote_device *) vdev;
+
+    chnl_hd = rdev->rp_channels;
+    if ((chnl_hd != RPMSG_NULL) && (rdev->role == RPMSG_MASTER)) {
+		rp_chnl = (struct rpmsg_channel *) chnl_hd->data;
+		if (rp_chnl->state == RPMSG_CHNL_STATE_IDLE) {
+			if (rdev->support_ns) {
+				rp_chnl->state = RPMSG_CHNL_STATE_NS;
+				rpmsg_send_ns_message(rdev, rp_chnl, RPMSG_NS_CREATE);
+			} else {
+				rp_chnl->state = RPMSG_CHNL_STATE_ACTIVE;
+			}
+			return;
+		}
+    }
+
+    env_lock_mutex(rdev->lock);
+
+    /* Process the received data from remote node */
+    rp_hdr = (struct rpmsg_hdr *) rpmsg_get_rx_buffer(rdev, &len, &idx);
+
+    env_unlock_mutex(rdev->lock);
+
+    while(rp_hdr) {
+
+        /* Get the channel node from the remote device channels list. */
+        node = rpmsg_rdev_get_endpoint_from_addr(rdev, rp_hdr->dst);        /*in the "rp_endpoints" list, find the node whose addr equal"rp_hdr->dst"*/
+
+        if (!node)
+            /* Fatal error no endpoint for the given dst addr. */
+            return;
+
+        rp_ept = (struct rpmsg_endpoint *) node->data;
+
+        rp_chnl = rp_ept->rp_chnl;
+
+        /*
+         * Linux will not send the null message, so the first message not only
+         * update the state machine, and the callback is called as well
+         */
+        if ((rp_chnl) && (rp_chnl->state == RPMSG_CHNL_STATE_NS)) {
+            /* First message from RPMSG Master, update channel
+             * destination address and state */
+            /*
+             * Only for Remote
+             */
+            rp_chnl->dst = rp_hdr->src;
+            rp_chnl->state = RPMSG_CHNL_STATE_ACTIVE;
+
+            /* Notify channel creation to application */
+            if (rdev->channel_created) {
+                rdev->channel_created(rp_chnl);     /* assigned by rpmsg_rdev_init*/
+            }
+        }
+
+        rp_ept->cb(rp_chnl, rp_hdr->data, rp_hdr->len, rp_ept->priv,        // for NS message, this will triggle rpmsg_ns_callback /*not the case*/
+                        rp_hdr->src);                                       // for none NS message, this will triggle APP registered callback "rpmsg_read_cb"
+ 
+        env_lock_mutex(rdev->lock);
+
+        /* Return used buffers. */
+        rpmsg_return_buffer(rdev, rp_hdr, len, idx);
+
+        rp_hdr = (struct rpmsg_hdr *) rpmsg_get_rx_buffer(rdev, &len, &idx);
+        env_unlock_mutex(rdev->lock);
+    }
+}
+
+/**
+ * rpmsg_ns_callback
+ *
+ * This callback handles name service announcement from the remote device
+ * and creates/deletes rpmsg channels.
+ *
+ * @param server_chnl - pointer to server channel control block.
+ * @param data        - pointer to received messages
+ * @param len         - length of received data
+ * @param priv        - any private data
+ * @param src         - source address
+ *
+ * @return - none
+ */
+void rpmsg_ns_callback(struct rpmsg_channel *server_chnl, void *data, int len,
+                void *priv, unsigned long src) {
+    struct remote_device *rdev;
+    struct rpmsg_channel *rp_chnl;
+    struct rpmsg_ns_msg *ns_msg;
+    struct llist *node;
+
+    rdev = (struct remote_device *) priv;
+
+    //FIXME: This assumes same name string size for channel name both on master
+    //and remote. If this is not the case then we will have to parse the
+    //message contents.
+
+    ns_msg = (struct rpmsg_ns_msg *) data;
+    ns_msg->name[len - 1] = '\0';
+
+    if (ns_msg->flags & RPMSG_NS_DESTROY) {
+        node = rpmsg_rdev_get_chnl_node_from_id(rdev, ns_msg->name);
+        if (node) {
+            rp_chnl = (struct rpmsg_channel *) node->data;
+            if (rdev->channel_destroyed) {
+                rdev->channel_destroyed(rp_chnl);
+            }
+            rpmsg_destroy_ept(rp_chnl->rp_ept);
+            _rpmsg_delete_channel(rp_chnl);
+        }
+    } else {
+        /*RPMSG_NS_CREATE*/
+        rp_chnl = _rpmsg_create_channel(rdev, ns_msg->name, 0x00, ns_msg->addr);
+        if (rp_chnl) {
+            rp_chnl->state = RPMSG_CHNL_STATE_ACTIVE;
+            /* Create default endpoint for channel */
+            rp_chnl->rp_ept = rpmsg_create_ept(rp_chnl, rdev->default_cb, rdev,
+                            RPMSG_ADDR_ANY);
+            if (rp_chnl->rp_ept) {
+                rp_chnl->src = rp_chnl->rp_ept->addr;
+                /*
+                 * Echo back the NS message to remote in order to
+                 * complete the connection stage. Remote will know the endpoint
+                 * address from this point onward which will enable it to send
+                 * message without waiting for any application level message from
+                 * master.
+                 */
+                rpmsg_send(rp_chnl,data,len);       /*Is this necessary? Infinite Echo Back ? */
+                if (rdev->channel_created) {
+                    rdev->channel_created(rp_chnl);
+                }
+            }
+        }
+    }
+}
+
+/**
+ * rpmsg_get_address
+ *
+ * This function provides unique 32 bit address.
+ *
+ * @param bitmap - bit map for addresses
+ * @param size   - size of bitmap
+ *
+ * return - a unique address
+ */
+int rpmsg_get_address(unsigned long *bitmap, int size) {
+    int addr = -1;
+    int i, tmp32;
+
+    /* Find first available buffer */
+    for (i = 0; i < size; i++) {
+        tmp32 = get_first_zero_bit(bitmap[i]);
+
+        if (tmp32 < 32) {
+            addr = tmp32 + i + 1;       /*This is strange*/
+            bitmap[i] |= (1 << tmp32);
+            break;
+        }
+    }
+
+    return addr;
+}
+
+/**
+ * rpmsg_release_address
+ *
+ * Frees the given address.
+ *
+ * @param bitmap - bit map for addresses
+ * @param size   - size of bitmap
+ * @param addr   - address to free
+ *
+ * return - none
+ */
+int rpmsg_release_address(unsigned long *bitmap, int size, int addr) {
+    unsigned int i, j;
+    unsigned long mask = 1;
+
+    if (addr >= size * 32)
+        return -1;
+
+    /* Mark the addr as available */
+    i = addr / 32;
+    j = addr % 32;
+
+    mask = mask << j;
+    bitmap[i] = bitmap[i] & (~mask);
+
+    return RPMSG_SUCCESS;
+}
+
+/**
+ * rpmsg_is_address_set
+ *
+ * Checks whether address is used or free.
+ *
+ * @param bitmap - bit map for addresses
+ * @param size   - size of bitmap
+ * @param addr   - address to free
+ *
+ * return - TRUE/FALSE
+ */
+int rpmsg_is_address_set(unsigned long *bitmap, int size,
+                int addr) {
+    int i, j;
+    unsigned long mask = 1;
+
+    if (addr >= size * 32)
+        return -1;
+
+    /* Mark the id as available */
+    i = addr / 32;
+    j = addr % 32;
+    mask = mask << j;
+
+    return (bitmap[i] & mask);
+}
+
+/**
+ * rpmsg_set_address
+ *
+ * Marks the address as consumed.
+ *
+ * @param bitmap - bit map for addresses
+ * @param size   - size of bitmap
+ * @param addr   - address to free
+ *
+ * return - none
+ */
+int rpmsg_set_address(unsigned long *bitmap, int size, int addr) {
+    int i, j;
+    unsigned long mask = 1;
+
+    if (addr >= size * 32)
+        return -1;
+
+    /* Mark the id as available */
+    i = addr / 32;
+    j = addr % 32;
+    mask = mask << j;
+    bitmap[i] |= mask;
+
+    return RPMSG_SUCCESS;
+}
diff --git a/middleware/multicore/open-amp/rpmsg/rpmsg_core.h b/middleware/multicore/open-amp/rpmsg/rpmsg_core.h
new file mode 100644
index 0000000..e70fd5c
--- /dev/null
+++ b/middleware/multicore/open-amp/rpmsg/rpmsg_core.h
@@ -0,0 +1,190 @@
+/*
+ * Copyright (c) 2014, Mentor Graphics Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of Mentor Graphics Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * 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 HOLDER 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.
+ */
+
+
+#ifndef _RPMSG_CORE_H_
+#define _RPMSG_CORE_H_
+
+#include "../porting/env/env.h"
+#include "../virtio/virtio.h"
+#include "../common/hil/hil.h"
+#include "../common/shm/sh_mem.h"
+#include "../common/llist/llist.h"
+#include "rpmsg.h"
+
+/* Configurable parameters */
+#define RPMSG_BUFFER_SIZE                       512
+#define RPMSG_MAX_VQ_PER_RDEV                   2
+#define RPMSG_NS_EPT_ADDR                       0x35
+#define RPMSG_ADDR_BMP_SIZE                     4
+
+/* Definitions for device types , null pointer, etc.*/
+#define RPMSG_SUCCESS                           0
+#define RPMSG_NULL                              (void *)0
+#define RPMSG_REMOTE                            0
+#define RPMSG_MASTER                            1
+#define RPMSG_TRUE                              1
+#define RPMSG_FALSE                             0
+
+/* RPMSG channel states. */
+#define RPMSG_CHNL_STATE_IDLE                   0
+#define RPMSG_CHNL_STATE_NS                     1
+#define RPMSG_CHNL_STATE_ACTIVE                 2
+
+/* Remote processor/device states. */
+#define RPMSG_DEV_STATE_IDLE                    0
+#define RPMSG_DEV_STATE_ACTIVE                  1
+
+/* Total tick count for 15secs - 1msec tick. */
+#define RPMSG_TICK_COUNT                        15000
+
+/* Time to wait - In multiple of 10 msecs. */
+#define RPMSG_TICKS_PER_INTERVAL                10
+
+/* Error macros. */
+#define RPMSG_ERRORS_BASE                       -3000
+#define RPMSG_ERR_NO_MEM                        (RPMSG_ERRORS_BASE - 1)
+#define RPMSG_ERR_NO_BUFF                       (RPMSG_ERRORS_BASE - 2)
+#define RPMSG_ERR_MAX_VQ                        (RPMSG_ERRORS_BASE - 3)
+#define RPMSG_ERR_PARAM                         (RPMSG_ERRORS_BASE - 4)
+#define RPMSG_ERR_DEV_STATE                     (RPMSG_ERRORS_BASE - 5)
+#define RPMSG_ERR_BUFF_SIZE                     (RPMSG_ERRORS_BASE - 6)
+#define RPMSG_ERR_DEV_ID                        (RPMSG_ERRORS_BASE - 7)
+#define RPMSG_ERR_DEV_ADDR                      (RPMSG_ERRORS_BASE - 8)
+
+struct rpmsg_channel;
+typedef void (*rpmsg_rx_cb_t)(struct rpmsg_channel *, void *, int, void *, unsigned long);
+typedef void (*rpmsg_chnl_cb_t)(struct rpmsg_channel *rp_chl);
+/**
+ * remote_device
+ *
+ * This structure is maintained by RPMSG driver to represent remote device/core.
+ *
+ * @virtd_dev           - virtio device for remote core
+ * @rvq                 - Rx virtqueue for virtio device
+ * @tvq                 - Tx virtqueue for virtio device
+ * @proc                - reference to remote processor
+ * @rp_channels         - rpmsg channels list for the device
+ * @rp_endpoints        - rpmsg endpoints list for the device
+ * @mem_pool            - shared memory pool
+ * @bitmap              - bitmap for channels addresses
+ * @channel_created     - create channel callback
+ * @channel_destroyed   - delete channel callback
+ * @default_cb          - default callback handler for RX data on channel
+ * @lock                - remote device mutex
+ * @role                - role of the remote device, RPMSG_MASTER/RPMSG_REMOTE
+ * @state               - remote device state, IDLE/ACTIVE
+ * @support_ns          - if device supports name service announcement
+ *
+ */
+struct remote_device {
+    struct virtio_device virt_dev;
+    struct virtqueue *rvq;
+    struct virtqueue *tvq;
+    struct hil_proc *proc;
+    struct llist *rp_channels;
+    struct llist *rp_endpoints;
+    struct sh_mem_pool *mem_pool;
+    unsigned long bitmap[RPMSG_ADDR_BMP_SIZE];
+    rpmsg_chnl_cb_t channel_created;
+    rpmsg_chnl_cb_t channel_destroyed;
+    rpmsg_rx_cb_t default_cb;
+    LOCK *lock;
+    unsigned int role;
+    unsigned int state;
+    int support_ns;
+};
+
+/* Core functions */
+int rpmsg_start_ipc(struct remote_device *rdev);
+struct rpmsg_channel *_rpmsg_create_channel(struct remote_device *rdev,
+                char *name, unsigned long src, unsigned long dst);
+void _rpmsg_delete_channel(struct rpmsg_channel * rp_chnl);
+struct rpmsg_endpoint *_create_endpoint(struct remote_device *rdev,
+		rpmsg_rx_cb_t cb, void *priv, unsigned long addr);
+void _destroy_endpoint(struct remote_device *rdev,
+		struct rpmsg_endpoint *rp_ept);
+void rpmsg_send_ns_message(struct remote_device *rdev,
+                struct rpmsg_channel *rp_chnl, unsigned long flags);
+int rpmsg_enqueue_buffer(struct remote_device *rdev, void *buffer,
+                unsigned long len, unsigned short idx);
+void rpmsg_return_buffer(struct remote_device *rdev, void *buffer,
+                unsigned long len, unsigned short idx);
+void *rpmsg_get_tx_buffer(struct remote_device *rdev, int *len,
+                unsigned short *idx);
+void rpmsg_free_buffer(struct remote_device *rdev, void *buffer);
+void rpmsg_free_channel(struct rpmsg_channel* rp_chnl);
+void * rpmsg_get_rx_buffer(struct remote_device *rdev, unsigned long *len,
+                unsigned short *idx);
+int rpmsg_get_address(unsigned long *bitmap, int size);
+int rpmsg_release_address(unsigned long *bitmap, int size, int addr);
+int rpmsg_is_address_set(unsigned long *bitmap, int size,
+                int addr);
+int rpmsg_set_address(unsigned long *bitmap, int size, int addr);
+void rpmsg_ns_callback(struct rpmsg_channel *server_chnl,
+                void *data, int len, void *priv, unsigned long src);
+
+/* Remote device functions */
+int rpmsg_rdev_init(struct remote_device **rdev, int dev_id, int role,
+                rpmsg_chnl_cb_t channel_created,
+                rpmsg_chnl_cb_t channel_destroyed,
+                rpmsg_rx_cb_t default_cb);
+void rpmsg_rdev_deinit(struct remote_device *rdev);
+struct llist *rpmsg_rdev_get_chnl_node_from_id(struct remote_device *rdev,
+                char *rp_chnl_id);
+struct llist *rpmsg_rdev_get_chnl_from_addr(struct remote_device *rdev,
+                unsigned long addr);
+struct llist *rpmsg_rdev_get_endpoint_from_addr(struct remote_device *rdev,
+		unsigned long addr);
+int rpmsg_rdev_notify(struct remote_device *rdev);
+int rpmsg_rdev_create_virtqueues(struct virtio_device *dev, int flags, int nvqs,
+                const char *names[], vq_callback *callbacks[],
+                struct virtqueue *vqs[]);
+unsigned char rpmsg_rdev_get_status(struct virtio_device *dev);
+
+void rpmsg_rdev_set_status(struct virtio_device *dev, unsigned char status);
+
+uint32_t rpmsg_rdev_get_feature(struct virtio_device *dev);
+
+void rpmsg_rdev_set_feature(struct virtio_device *dev, uint32_t feature);
+
+uint32_t rpmsg_rdev_negotiate_feature(struct virtio_device *dev,
+                uint32_t features);
+/*
+ * Read/write a variable amount from the device specific (ie, network)
+ * configuration region. This region is encoded in the same endian as
+ * the guest.
+ */
+void rpmsg_rdev_read_config(struct virtio_device *dev, uint32_t offset,
+                void *dst, int length);
+void rpmsg_rdev_write_config(struct virtio_device *dev, uint32_t offset,
+                void *src, int length);
+void rpmsg_rdev_reset(struct virtio_device *dev);
+
+#endif /* _RPMSG_CORE_H_ */