iodev.h

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/*
 * 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.
 *
 * 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, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#ifndef __KVM_IODEV_H__
#define __KVM_IODEV_H__

#include <linux/kvm_types.h>
#include <asm/errno.h>

struct kvm_io_device;

struct kvm_io_device_ops {
    int (*read)(struct kvm_io_device *this,
            gpa_t addr,
            int len,
            void *val);
    int (*write)(struct kvm_io_device *this,
             gpa_t addr,
             int len,
             const void *val);
    void (*destructor)(struct kvm_io_device *this);
};


struct kvm_io_device {
    const struct kvm_io_device_ops *ops;
};

static inline void kvm_iodevice_init(struct kvm_io_device *dev,
                     const struct kvm_io_device_ops *ops)
{
    dev->ops = ops;
}

static inline int kvm_iodevice_read(struct kvm_io_device *dev,
                    gpa_t addr, int l, void *v)
{
    return dev->ops->read ? dev->ops->read(dev, addr, l, v) : -EOPNOTSUPP;
}

static inline int kvm_iodevice_write(struct kvm_io_device *dev,
                     gpa_t addr, int l, const void *v)
{
    return dev->ops->write ? dev->ops->write(dev, addr, l, v) : -EOPNOTSUPP;
}

static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
{
    if (dev->ops->destructor)
        dev->ops->destructor(dev);
}

#endif /* __KVM_IODEV_H__ */