1 files changed, 34 insertions, 0 deletions
diff --git a/xen/ring.h b/xen/ring.h
new file mode 100644
index 0000000..6ed00ac
--- /dev/null
+++ b/xen/ring.h
@@ -0,0 +1,34 @@
+/*
+ *  Copyright (C) 2006 Samuel Thibault <samuel.thibault@ens-lyon.org>
+ *
+ * This program is free software ; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation ; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY ; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the program ; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef	XEN_RING_H
+#define	XEN_RING_H
+
+typedef unsigned32_t hyp_ring_pos_t;
+
+#define hyp_ring_idx(ring, pos) (((unsigned)(pos)) & (sizeof(ring)-1))
+#define hyp_ring_cell(ring, pos) (ring)[hyp_ring_idx((ring), (pos))]
+#define hyp_ring_smash(ring, prod, cons) (hyp_ring_idx((ring), (prod) + 1) == \
+				 hyp_ring_idx((ring), (cons)))
+#define hyp_ring_available(ring, prod, cons) hyp_ring_idx((ring), (cons)-(prod)-1)
+
+void hyp_ring_store(void *dest, const void *src, size_t size, void *start, void *end);
+void hyp_ring_fetch(void *dest, const void *src, size_t size, void *start, void *end);
+size_t hyp_ring_next_word(char **c, void *start, void *end);
+
+#endif	/* XEN_RING_H */