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authorYang Zhang <yang.z.zhang@intel.com>2015-08-28 09:58:54 +0800
committerYang Zhang <yang.z.zhang@intel.com>2015-09-01 12:44:00 +0800
commite44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch)
tree66b09f592c55df2878107a468a91d21506104d3f /qemu/roms/seabios/src/hw/virtio-ring.h
parent9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff)
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5 Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/roms/seabios/src/hw/virtio-ring.h')
-rw-r--r--qemu/roms/seabios/src/hw/virtio-ring.h131
1 files changed, 131 insertions, 0 deletions
diff --git a/qemu/roms/seabios/src/hw/virtio-ring.h b/qemu/roms/seabios/src/hw/virtio-ring.h
new file mode 100644
index 000000000..b7a7aafb2
--- /dev/null
+++ b/qemu/roms/seabios/src/hw/virtio-ring.h
@@ -0,0 +1,131 @@
+#ifndef _VIRTIO_RING_H
+#define _VIRTIO_RING_H
+
+#include "types.h" // u64
+#include "memmap.h" // PAGE_SIZE
+
+#define PAGE_SHIFT 12
+#define PAGE_MASK (PAGE_SIZE-1)
+
+#define virt_to_phys(v) (unsigned long)(v)
+#define phys_to_virt(p) (void*)(p)
+/* Compiler barrier is enough as an x86 CPU does not reorder reads or writes */
+#define smp_rmb() barrier()
+#define smp_wmb() barrier()
+
+/* Status byte for guest to report progress, and synchronize features. */
+/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
+#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
+/* We have found a driver for the device. */
+#define VIRTIO_CONFIG_S_DRIVER 2
+/* Driver has used its parts of the config, and is happy */
+#define VIRTIO_CONFIG_S_DRIVER_OK 4
+/* We've given up on this device. */
+#define VIRTIO_CONFIG_S_FAILED 0x80
+
+#define MAX_QUEUE_NUM (128)
+
+#define VRING_DESC_F_NEXT 1
+#define VRING_DESC_F_WRITE 2
+
+#define VRING_AVAIL_F_NO_INTERRUPT 1
+
+#define VRING_USED_F_NO_NOTIFY 1
+
+struct vring_desc
+{
+ u64 addr;
+ u32 len;
+ u16 flags;
+ u16 next;
+};
+
+struct vring_avail
+{
+ u16 flags;
+ u16 idx;
+ u16 ring[0];
+};
+
+struct vring_used_elem
+{
+ u32 id;
+ u32 len;
+};
+
+struct vring_used
+{
+ u16 flags;
+ u16 idx;
+ struct vring_used_elem ring[];
+};
+
+struct vring {
+ unsigned int num;
+ struct vring_desc *desc;
+ struct vring_avail *avail;
+ struct vring_used *used;
+};
+
+#define vring_size(num) \
+ (((((sizeof(struct vring_desc) * num) + \
+ (sizeof(struct vring_avail) + sizeof(u16) * num)) \
+ + PAGE_MASK) & ~PAGE_MASK) + \
+ (sizeof(struct vring_used) + sizeof(struct vring_used_elem) * num))
+
+typedef unsigned char virtio_queue_t[vring_size(MAX_QUEUE_NUM)];
+
+struct vring_virtqueue {
+ virtio_queue_t queue;
+ struct vring vring;
+ u16 free_head;
+ u16 last_used_idx;
+ u16 vdata[MAX_QUEUE_NUM];
+ /* PCI */
+ int queue_index;
+};
+
+struct vring_list {
+ char *addr;
+ unsigned int length;
+};
+
+static inline void vring_init(struct vring *vr,
+ unsigned int num, unsigned char *queue)
+{
+ unsigned int i;
+ unsigned long pa;
+
+ ASSERT32FLAT();
+ vr->num = num;
+
+ /* physical address of desc must be page aligned */
+
+ pa = virt_to_phys(queue);
+ pa = (pa + PAGE_MASK) & ~PAGE_MASK;
+ vr->desc = phys_to_virt(pa);
+
+ vr->avail = (struct vring_avail *)&vr->desc[num];
+ /* disable interrupts */
+ vr->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
+
+ /* physical address of used must be page aligned */
+
+ pa = virt_to_phys(&vr->avail->ring[num]);
+ pa = (pa + PAGE_MASK) & ~PAGE_MASK;
+ vr->used = phys_to_virt(pa);
+
+ for (i = 0; i < num - 1; i++)
+ vr->desc[i].next = i + 1;
+ vr->desc[i].next = 0;
+}
+
+int vring_more_used(struct vring_virtqueue *vq);
+void vring_detach(struct vring_virtqueue *vq, unsigned int head);
+int vring_get_buf(struct vring_virtqueue *vq, unsigned int *len);
+void vring_add_buf(struct vring_virtqueue *vq, struct vring_list list[],
+ unsigned int out, unsigned int in,
+ int index, int num_added);
+void vring_kick(unsigned int ioaddr, struct vring_virtqueue *vq, int num_added);
+
+#endif /* _VIRTIO_RING_H_ */