Function virtio_gpu_read

components/drivers/virtio/virtio_gpu.c:452–468

}

static rt_ssize_t virtio_gpu_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
{
    struct virtio_gpu_device *virtio_gpu_dev = (struct virtio_gpu_device *)dev;

    if (virtio_gpu_dev->framebuffer == RT_NULL || pos + size >= virtio_gpu_dev->smem_len)
    {
        return 0;
    }

    rt_mutex_take(&virtio_gpu_dev->rw_mutex, RT_WAITING_FOREVER);

    rt_memcpy(buffer, (rt_uint8_t *)virtio_gpu_dev->framebuffer + pos, size);

    rt_mutex_release(&virtio_gpu_dev->rw_mutex);

    return size;
}

static rt_ssize_t virtio_gpu_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
{