From: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@epam.com>

This is the ABI for the two halves of a para-virtualized
display driver.

Changes since initial:
 * DRM changed to DISPL, protocol made generic
 * major re-work addressing issues raised for sndif

Signed-off-by: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@epam.com>
Signed-off-by: Oleksandr Grytsov <Oleksandr_Grytsov@epam.com>
---
+struct xendispl_event_page {
+    uint32_t in_cons;
+    uint32_t in_prod;
+    uint8_t reserved[60];