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 31struct vring_desc { 32 __virtio64 addr; 33 __virtio32 len; 34 __virtio16 flags; 35 __virtio16 next; 36}; 37struct vring_avail { 38 __virtio16 flags; 39 __virtio16 idx; 40 __virtio16 ring[]; 41}; 42struct vring_used_elem { 43 __virtio32 id; 44 __virtio32 len; 45}; 46struct vring_used { 47 __virtio16 flags; 48 __virtio16 idx; 49 struct vring_used_elem ring[]; 50}; 51struct 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