Use io(4) for I/O port access on ia64, rather than through sysarch(2).

I/O port access is implemented on Itanium by reading and writing to a
special region in memory. To hide details and avoid misaligned memory
accesses, a process did I/O port reads and writes by making a MD system
call. There's one fatal problem with this approach: unprivileged access
was not being prevented. /dev/io serves that purpose on amd64/i386, so
employ it on ia64 as well. Use an ioctl for doing the actual I/O and
remove the sysarch(2) interface.

Backward compatibility is not being considered. The sysarch(2) approach
was added to support X11, but support for FreeBSD/ia64 was never fully
implemented in X11. Thus, nothing gets broken that didn't need more work
to begin with.

MFC after:	1 week

2 files changed, 51 insertions, 9 deletions

diff --git a/sys/ia64/include/iodev.h b/sys/ia64/include/iodev.h
new file mode 100644
index 0000000..11d05fc
--- /dev/null
+++ b/sys/ia64/include/iodev.h
@@ -0,0 +1,51 @@
+/*-
+ * Copyright (c) 2010 Marcel Moolenaar
+ * 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.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 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 _MACHINE_IODEV_H_
+#define	_MACHINE_IODEV_H_
+
+struct iodev_pio_req {
+	u_int access;
+#define	IODEV_PIO_READ		0
+#define	IODEV_PIO_WRITE		1
+	u_int port;
+	u_int width;
+	u_int val;
+};
+
+#define	IODEV_PIO	_IOWR('I', 0, struct iodev_pio_req)
+
+#ifdef _KERNEL
+
+d_open_t	ioopen;
+d_close_t	ioclose;
+d_ioctl_t	ioioctl;
+
+#endif
+
+#endif /* _MACHINE_IODEV_H_ */
diff --git a/sys/ia64/include/sysarch.h b/sys/ia64/include/sysarch.h
index a7f39de..c46d100 100644
--- a/sys/ia64/include/sysarch.h
+++ b/sys/ia64/include/sysarch.h
@@ -32,15 +32,6 @@
 #ifndef _MACHINE_SYSARCH_H_
 #define	_MACHINE_SYSARCH_H_
 
-#define	IA64_IORD	0
-#define	IA64_IOWR	1
-
-struct ia64_iodesc {
-	int port;
-	int width;
-	unsigned long val;
-};
-
 #ifndef _KERNEL
 #include <sys/cdefs.h>