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

[Nikunj A Dadhania]

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));
+}
+
+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);
-- 
2.5.0