/*-
 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org>
 * 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 unmodified, 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */
#include "virtio.h"

static const char *virtio_feature_name(unsigned long feature, struct virtio_feature_desc *);

//TODO : This structure may change depending on the types of devices we support.
static struct virtio_ident {
    unsigned short  devid;
    const char  *name;
} virtio_ident_table[] = {
    { VIRTIO_ID_NETWORK,    "Network"   },
    { VIRTIO_ID_BLOCK,  "Block"     },
    { VIRTIO_ID_CONSOLE,    "Console"   },
    { VIRTIO_ID_ENTROPY,    "Entropy"   },
    { VIRTIO_ID_BALLOON,    "Balloon"   },
    { VIRTIO_ID_IOMEMORY,   "IOMemory"  },
    { VIRTIO_ID_SCSI,   "SCSI"      },
    { VIRTIO_ID_9P,     "9P Transport"  },

    { 0, NULL }
};

/* Device independent features. */
static struct virtio_feature_desc virtio_common_feature_desc[] = {
    { VIRTIO_F_NOTIFY_ON_EMPTY, "NotifyOnEmpty" },
    { VIRTIO_RING_F_INDIRECT_DESC,  "RingIndirect"  },
    { VIRTIO_RING_F_EVENT_IDX,  "EventIdx"  },
    { VIRTIO_F_BAD_FEATURE,     "BadFeature"    },

    { 0, NULL }
};

const char *
virtio_dev_name(unsigned short devid)
{
    struct virtio_ident *ident;

    for (ident = virtio_ident_table; ident->name != NULL; ident++) {
        if (ident->devid == devid)
            return (ident->name);
    }

    return (NULL);
}

static const char *
virtio_feature_name(unsigned long val, struct virtio_feature_desc *desc)
{
    int i, j;
    struct virtio_feature_desc *descs[2] = { desc,
        virtio_common_feature_desc };

    for (i = 0; i < 2; i++) {
        if (descs[i] == NULL)
            continue;

        for (j = 0; descs[i][j].vfd_val != 0; j++) {
            if (val == descs[i][j].vfd_val)
                return (descs[i][j].vfd_str);
        }
    }

    return (NULL);
}

void virtio_describe(struct virtio_device *dev, const char *msg,
    uint32_t features, struct virtio_feature_desc *desc)
{
    // TODO: Not used currently - keeping it for future use
    virtio_feature_name(0,desc);
}