virtio.h: add virtio_has_feature api for virtio driver

Virtio driver can used this api to judge whether the this feature is supported by both virtio driver and device. Signed-off-by: Bowen Wang <[email protected]>
apache · Dec 11, 2023 · 449197c · 449197c
1 parent 8b9c64e
commit 449197c
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/include/nuttx/virtio/virtio.h b/include/nuttx/virtio/virtio.h
@@ -38,6 +38,9 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
+#define virtio_has_feature(vdev, fbit) \
+      (((vdev)->features & (1UL << (fbit))) != 0)
+
 #define virtio_read_config_member(vdev, structname, member, ptr) \
       virtio_read_config((vdev), offsetof(structname, member), \
                          (ptr), sizeof(*(ptr)));