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

5 files changed, 212 insertions, 72 deletions

diff --git a/sys/ia64/conf/DEFAULTS b/sys/ia64/conf/DEFAULTS
index 625ff90955cc..2cb2330054bb 100644
--- a/sys/ia64/conf/DEFAULTS
+++ b/sys/ia64/conf/DEFAULTS
@@ -9,6 +9,7 @@ machine		ia64
 device		acpi		# ACPI support
 
 # Pseudo devices.
+device		io		# I/O & EFI runtime device
 device		mem		# Memory and kernel memory devices
 
 # UART chips on this platform
diff --git a/sys/ia64/ia64/iodev_machdep.c b/sys/ia64/ia64/iodev_machdep.c
new file mode 100644
index 000000000000..498a042cfce0
--- /dev/null
+++ b/sys/ia64/ia64/iodev_machdep.c
@@ -0,0 +1,160 @@
+/*-
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/conf.h>
+#include <sys/fcntl.h>
+#include <sys/ioccom.h>
+#include <sys/priv.h>
+#include <sys/proc.h>
+#include <sys/systm.h>
+
+#include <machine/bus.h>
+#include <machine/iodev.h>
+
+static int iodev_pio_read(struct iodev_pio_req *req);
+static int iodev_pio_write(struct iodev_pio_req *req);
+
+/* ARGSUSED */
+int
+ioopen(struct cdev *dev __unused, int flags __unused, int fmt __unused,
+    struct thread *td)
+{
+	int error;
+
+	error = priv_check(td, PRIV_IO);
+	if (error == 0)
+		error = securelevel_gt(td->td_ucred, 0);
+
+	return (error);
+}
+
+/* ARGSUSED */
+int
+ioclose(struct cdev *dev __unused, int flags __unused, int fmt __unused,
+    struct thread *td __unused)
+{
+
+	return (0);
+}
+
+/* ARGSUSED */
+int
+ioioctl(struct cdev *dev __unused, u_long cmd, caddr_t data,
+    int fflag __unused, struct thread *td __unused)
+{
+	struct iodev_pio_req *pio_req;
+	int error;
+
+	error = ENOIOCTL;
+	switch (cmd) {
+	case IODEV_PIO:
+		pio_req = (struct iodev_pio_req *)data;
+		switch (pio_req->access) {
+		case IODEV_PIO_READ:
+			error = iodev_pio_read(pio_req);
+			break;
+		case IODEV_PIO_WRITE:
+			error = iodev_pio_write(pio_req);
+			break;
+		default:
+			error = EINVAL;
+			break;
+		}
+		break;
+	}
+
+	return (error);
+}
+
+static int
+iodev_pio_read(struct iodev_pio_req *req)
+{
+
+	switch (req->width) {
+	case 1:
+		req->val = bus_space_read_io_1(req->port);
+		break;
+	case 2:
+		if (req->port & 1) {
+			req->val = bus_space_read_io_1(req->port);
+			req->val |= bus_space_read_io_1(req->port + 1) << 8;
+		} else
+			req->val = bus_space_read_io_2(req->port);
+		break;
+	case 4:
+		if (req->port & 1) {
+			req->val = bus_space_read_io_1(req->port);
+			req->val |= bus_space_read_io_2(req->port + 1) << 8;
+			req->val |= bus_space_read_io_1(req->port + 3) << 24;
+		} else if (req->port & 2) {
+			req->val = bus_space_read_io_2(req->port);
+			req->val |= bus_space_read_io_2(req->port + 2) << 16;
+		} else
+			req->val = bus_space_read_io_4(req->port);
+		break;
+	default:
+		return (EINVAL);
+	}
+
+	return (0);
+}
+
+static int
+iodev_pio_write(struct iodev_pio_req *req)
+{
+
+	switch (req->width) {
+	case 1:
+		bus_space_write_io_1(req->port, req->val);
+		break;
+	case 2:
+		if (req->port & 1) {
+			bus_space_write_io_1(req->port, req->val);
+			bus_space_write_io_1(req->port + 1, req->val >> 8);
+		} else
+			bus_space_write_io_2(req->port, req->val);
+		break;
+	case 4:
+		if (req->port & 1) {
+			bus_space_write_io_1(req->port, req->val);
+			bus_space_write_io_2(req->port + 1, req->val >> 8);
+			bus_space_write_io_1(req->port + 3, req->val >> 24);
+		} else if (req->port & 2) {
+			bus_space_write_io_2(req->port, req->val);
+			bus_space_write_io_2(req->port + 2, req->val >> 16);
+		} else
+			bus_space_write_io_4(req->port, req->val);
+		break;
+	default:
+		return (EINVAL);
+	}
+
+	return (0);
+}
diff --git a/sys/ia64/ia64/sys_machdep.c b/sys/ia64/ia64/sys_machdep.c
index e39cbab621e6..764df2ea0276 100644
--- a/sys/ia64/ia64/sys_machdep.c
+++ b/sys/ia64/ia64/sys_machdep.c
@@ -49,72 +49,9 @@ struct sysarch_args {
 int
 sysarch(struct thread *td, struct sysarch_args *uap)
 {
-	struct ia64_iodesc iod;
 	int error;
 
-	error = 0;
 	switch(uap->op) {
-	case IA64_IORD:
-		copyin(uap->parms, &iod, sizeof(iod));
-		switch (iod.width) {
-		case 1:
-			iod.val = inb(iod.port);
-			break;
-		case 2:
-			if (iod.port & 1) {
-				iod.val = inb(iod.port);
-				iod.val |= inb(iod.port + 1) << 8;
-			} else
-				iod.val = inw(iod.port);
-			break;
-		case 4:
-			if (iod.port & 3) {
-				if (iod.port & 1) {
-					iod.val = inb(iod.port);
-					iod.val |= inw(iod.port + 1) << 8;
-					iod.val |= inb(iod.port + 3) << 24;
-				} else {
-					iod.val = inw(iod.port);
-					iod.val |= inw(iod.port + 2) << 16;
-				}
-			} else
-				iod.val = inl(iod.port);
-			break;
-		default:
-			error = EINVAL;
-		}
-		copyout(&iod, uap->parms, sizeof(iod));
-		break;
-	case IA64_IOWR:
-		copyin(uap->parms, &iod, sizeof(iod));
-		switch (iod.width) {
-		case 1:
-			outb(iod.port, iod.val);
-			break;
-		case 2:
-			if (iod.port & 1) {
-				outb(iod.port, iod.val);
-				outb(iod.port + 1, iod.val >> 8);
-			} else
-				outw(iod.port, iod.val);
-			break;
-		case 4:
-			if (iod.port & 3) {
-				if (iod.port & 1) {
-					outb(iod.port, iod.val);
-					outw(iod.port + 1, iod.val >> 8);
-					outb(iod.port + 3, iod.val >> 24);
-				} else {
-					outw(iod.port, iod.val);
-					outw(iod.port + 2, iod.val >> 16);
-				}
-			} else
-				outl(iod.port, iod.val);
-			break;
-		default:
-			error = EINVAL;
-		}
-		break;
 	default:
 		error = EINVAL;
 		break;
diff --git a/sys/ia64/include/iodev.h b/sys/ia64/include/iodev.h
new file mode 100644
index 000000000000..11d05fc1c21d
--- /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 a7f39de2ffe8..c46d100beea5 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>