1 files changed, 65 insertions, 0 deletions
diff --git a/usr.sbin/bhyve/elcr.c b/usr.sbin/bhyve/elcr.c
new file mode 100644
index 0000000..2417ae1
--- /dev/null
+++ b/usr.sbin/bhyve/elcr.c
@@ -0,0 +1,65 @@
+/*-
+ * Copyright (c) 2011 NetApp, Inc.
+ * 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 NETAPP, INC ``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 NETAPP, INC 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+
+#include "inout.h"
+
+/*
+ * EISA interrupt Level Control Register.
+ *
+ * This is a 16-bit register with one bit for each of the IRQ0 through IRQ15.
+ * A level triggered irq is indicated by setting the corresponding bit to '1'.
+ */
+#define	ELCR_PORT	0x4d0
+
+static uint8_t elcr[2] = { 0x00, 0x00 };
+
+static int
+elcr_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
+	     uint32_t *eax, void *arg)
+{
+	int idx;
+
+	if (bytes != 1)
+		return (-1);
+
+	idx = port - ELCR_PORT;
+
+	if (in)
+		*eax = elcr[idx];
+	else
+		elcr[idx] = *eax;
+
+	return (0);
+}
+INOUT_PORT(elcr, ELCR_PORT + 0, IOPORT_F_INOUT, elcr_handler);
+INOUT_PORT(elcr, ELCR_PORT + 1, IOPORT_F_INOUT, elcr_handler);