[SLOF] [PATCH v1 09/27] virtio: add 64-bit virtio helpers for 1.0

[Alexey Kardashevskiy]

On 01/13/2016 10:16 PM, Nikunj A Dadhania wrote:
> Signed-off-by: Nikunj A Dadhania <nikunj at linux.vnet.ibm.com>
> ---
>   lib/libvirtio/virtio.c | 18 ++++++++++++++++++
>   lib/libvirtio/virtio.h |  2 ++
>   2 files changed, 20 insertions(+)
>
> diff --git a/lib/libvirtio/virtio.c b/lib/libvirtio/virtio.c
> index 77676c7..aa4a45b 100644
> --- a/lib/libvirtio/virtio.c
> +++ b/lib/libvirtio/virtio.c
> @@ -81,6 +81,24 @@ struct virtio_dev_common {
>   	le64 q_used;
>   } __attribute__ ((packed));
>
> +void virtio_write64(void *addr, uint64_t val)
> +{
> +	uint32_t hi = (val >> 32) & 0xFFFFFFFF;
> +	uint32_t lo = val & 0xFFFFFFFF;
> +
> +	ci_write_32(addr, cpu_to_le32(lo));
> +	ci_write_32(addr + 4, cpu_to_le32(hi));
> +}


ci_write_64 and cpu_to_le64 are there, why these new helpers?


> +
> +uint64_t virtio_read64(void *addr)
> +{
> +	uint64_t hi, lo;
> +
> +	lo = le32_to_cpu(ci_read_32(addr));
> +	hi = le32_to_cpu(ci_read_32(addr + 4));
> +	return (hi << 32) | lo;
> +}
> +
>   static void virtio_process_cap(struct virtio_device *dev, uint8_t cap_ptr)
>   {
>   	struct virtio_cap *cap;
> diff --git a/lib/libvirtio/virtio.h b/lib/libvirtio/virtio.h
> index 537862b..aa75c2d 100644
> --- a/lib/libvirtio/virtio.h
> +++ b/lib/libvirtio/virtio.h
> @@ -106,6 +106,8 @@ struct vqs {
>   /* Parts of the virtqueue are aligned on a 4096 byte page boundary */
>   #define VQ_ALIGN(addr)	(((addr) + 0xfff) & ~0xfff)
>
> +extern void virtio_write64(void *addr, uint64_t val);
> +extern uint64_t virtio_read64(void *addr);
>   extern unsigned long virtio_vring_size(unsigned int qsize);
>   extern unsigned int virtio_get_qsize(struct virtio_device *dev, int queue);
>   extern struct vring_desc *virtio_get_vring_desc(struct virtio_device *dev, int queue);
>


-- 
Alexey