1 files changed, 77 insertions, 0 deletions
diff --git a/sys/amd64/amd64/io.c b/sys/amd64/amd64/io.c
new file mode 100644
index 000000000000..1aaf2ef63282
--- /dev/null
+++ b/sys/amd64/amd64/io.c
@@ -0,0 +1,77 @@
+/*-
+ * Copyright (c) 2004 Mark R V Murray
+ * 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
+ *    in this position and unchanged.
+ * 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 AUTHORS ``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 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/lock.h>
+#include <sys/malloc.h>
+#include <sys/mutex.h>
+#include <sys/proc.h>
+#include <sys/signalvar.h>
+#include <sys/systm.h>
+
+#include <machine/db_machdep.h>
+#include <machine/frame.h>
+#include <machine/psl.h>
+#include <machine/specialreg.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#include <machine/iodev.h>
+
+/* ARGSUSED */
+int
+ioopen(struct cdev *dev __unused, int flags __unused, int fmt __unused,
+    struct thread *td)
+{
+	int error;
+
+	error = suser(td);
+	if (error != 0)
+		return (error);
+	error = securelevel_gt(td->td_ucred, 0);
+	if (error != 0)
+		return (error);
+
+	td->td_frame->tf_rflags |= PSL_IOPL;
+
+	return (0);
+}
+
+/* ARGSUSED */
+int
+ioclose(struct cdev *dev __unused, int flags __unused, int fmt __unused,
+    struct thread *td)
+{
+	td->td_frame->tf_rflags &= ~PSL_IOPL;
+
+	return (0);
+}