Add infrastructure for doing compatibility shims, as has been sorely

needed for the last 10 years.  Far too much of the internal API is
exposed, and every small adjustment causes applications to stop working.
To kick this off, bump the API version to 0x17 as should have been done
with r246713, but add shims to compensate.  Thanks to the shims, there
should be no visible change in application behavior.

I have plans to do a significant overhaul of the API to harnen it for
the future, but until then, I welcome others to add shims for older
versions of the API.

Obtained from:	Netflix

1 files changed, 48 insertions, 0 deletions

diff --git a/sys/cam/cam_compat.h b/sys/cam/cam_compat.h
new file mode 100644
index 0000000..b23e7b2
--- /dev/null
+++ b/sys/cam/cam_compat.h
@@ -0,0 +1,48 @@
+/*-
+ * CAM ioctl compatibility shims
+ *
+ * Copyright (c) 2013 Scott Long
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification, immediately at the beginning of the file.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _CAM_CAM_COMPAT_H
+#define _CAM_CAM_COMPAT_H
+
+int cam_compat_ioctl(struct cdev *dev, u_long *cmd, caddr_t *addr, int *flag, struct thread *td);
+
+/* Version 0x16 compatibility */
+#define CAM_VERSION_0x16	0x16
+
+/* The size of the union ccb didn't change when going to 0x17 */
+#define CAMIOCOMMAND_0x16	_IOWR(CAM_VERSION_0x16, 2, union ccb)
+#define CAMGETPASSTHRU_0x16	_IOWR(CAM_VERSION_0x16, 3, union ccb)
+
+#define CAM_SCATTER_VALID_0x16	0x10
+#define CAM_SG_LIST_PHYS_0x16	0x40000
+#define CAM_DATA_PHYS_0x16	0x20000
+
+#endif
+