1 files changed, 120 insertions, 0 deletions
diff --git a/drivers/staging/hv/RingBuffer.h b/drivers/staging/hv/RingBuffer.h
new file mode 100644
index 000000000000..16586148bef9
--- /dev/null
+++ b/drivers/staging/hv/RingBuffer.h
@@ -0,0 +1,120 @@
+/*
+ *
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ *   Haiyang Zhang <haiyangz@microsoft.com>
+ *   Hank Janssen  <hjanssen@microsoft.com>
+ *
+ */
+
+
+#ifndef _RING_BUFFER_H_
+#define _RING_BUFFER_H_
+
+#include <linux/scatterlist.h>
+
+#include "include/osd.h"
+
+typedef struct _RING_BUFFER {
+    volatile u32	WriteIndex;     /* Offset in bytes from the start of ring data below */
+    volatile u32	ReadIndex;      /* Offset in bytes from the start of ring data below */
+
+	volatile u32 InterruptMask;
+	u8	Reserved[4084];			/* Pad it to PAGE_SIZE so that data starts on page boundary */
+	/* NOTE: The InterruptMask field is used only for channels but since our vmbus connection */
+	/* also uses this data structure and its data starts here, we commented out this field. */
+	/* volatile u32 InterruptMask; */
+	/* Ring data starts here + RingDataStartOffset !!! DO NOT place any fields below this !!! */
+    u8		Buffer[0];
+} __attribute__((packed)) RING_BUFFER;
+
+typedef struct _RING_BUFFER_INFO {
+    RING_BUFFER*	RingBuffer;
+    u32			RingSize;			/* Include the shared header */
+	spinlock_t ring_lock;
+
+    u32			RingDataSize;		/* < ringSize */
+	u32			RingDataStartOffset;
+
+} RING_BUFFER_INFO;
+
+
+typedef struct _RING_BUFFER_DEBUG_INFO {
+	u32		CurrentInterruptMask;
+	u32		CurrentReadIndex;
+	u32		CurrentWriteIndex;
+	u32		BytesAvailToRead;
+	u32		BytesAvailToWrite;
+}RING_BUFFER_DEBUG_INFO;
+
+
+
+/* Interface */
+
+
+static int
+RingBufferInit(
+	RING_BUFFER_INFO	*RingInfo,
+	void *				Buffer,
+	u32				BufferLen
+	);
+
+static void
+RingBufferCleanup(
+	RING_BUFFER_INFO	*RingInfo
+	);
+
+static int
+RingBufferWrite(
+	RING_BUFFER_INFO *RingInfo,
+	struct scatterlist *sglist,
+	u32 sgcount
+	);
+
+static int
+RingBufferPeek(
+	RING_BUFFER_INFO	*RingInfo,
+	void *				Buffer,
+	u32				BufferLen
+	);
+
+static int
+RingBufferRead(
+	RING_BUFFER_INFO	*RingInfo,
+	void *				Buffer,
+	u32				BufferLen,
+	u32				Offset
+	);
+
+static u32
+GetRingBufferInterruptMask(
+	RING_BUFFER_INFO *RingInfo
+	);
+
+static void
+DumpRingInfo(
+	RING_BUFFER_INFO* RingInfo,
+	char *Prefix
+	);
+
+static void
+RingBufferGetDebugInfo(
+	RING_BUFFER_INFO		*RingInfo,
+	RING_BUFFER_DEBUG_INFO	*DebugInfo
+	);
+
+#endif /* _RING_BUFFER_H_ */