1 /**************************************************************************** 2 **************************************************************************** 3 *** 4 *** This header was automatically generated from a Linux kernel header 5 *** of the same name, to make information necessary for userspace to 6 *** call into the kernel available to libc. It contains only constants, 7 *** structures, and macros generated from the original header, and thus, 8 *** contains no copyrightable information. 9 *** 10 *** To edit the content of this header, modify the corresponding 11 *** source file (e.g. under external/kernel-headers/original/) then 12 *** run bionic/libc/kernel/tools/update_all.py 13 *** 14 *** Any manual change here will be lost the next time this script will 15 *** be run. You've been warned! 16 *** 17 **************************************************************************** 18 ****************************************************************************/ 19 #ifndef _UAPI_LINUX_VIRTIO_RING_H 20 #define _UAPI_LINUX_VIRTIO_RING_H 21 #include <stdint.h> 22 #include <linux/types.h> 23 #include <linux/virtio_types.h> 24 #define VRING_DESC_F_NEXT 1 25 #define VRING_DESC_F_WRITE 2 26 #define VRING_DESC_F_INDIRECT 4 27 #define VRING_USED_F_NO_NOTIFY 1 28 #define VRING_AVAIL_F_NO_INTERRUPT 1 29 #define VIRTIO_RING_F_INDIRECT_DESC 28 30 #define VIRTIO_RING_F_EVENT_IDX 29 31 struct vring_desc { 32 __virtio64 addr; 33 __virtio32 len; 34 __virtio16 flags; 35 __virtio16 next; 36 }; 37 struct vring_avail { 38 __virtio16 flags; 39 __virtio16 idx; 40 __virtio16 ring[]; 41 }; 42 struct vring_used_elem { 43 __virtio32 id; 44 __virtio32 len; 45 }; 46 struct vring_used { 47 __virtio16 flags; 48 __virtio16 idx; 49 struct vring_used_elem ring[]; 50 }; 51 struct vring { 52 unsigned int num; 53 struct vring_desc * desc; 54 struct vring_avail * avail; 55 struct vring_used * used; 56 }; 57 #define VRING_AVAIL_ALIGN_SIZE 2 58 #define VRING_USED_ALIGN_SIZE 4 59 #define VRING_DESC_ALIGN_SIZE 16 60 #define vring_used_event(vr) ((vr)->avail->ring[(vr)->num]) 61 #define vring_avail_event(vr) (* (__virtio16 *) & (vr)->used->ring[(vr)->num]) 62 #endif 63
