1/*-
2 * Copyright (c) 2011 NetApp, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/types.h>
33
34#include "inout.h"
35
36/*
37 * EISA interrupt Level Control Register.
38 *
39 * This is a 16-bit register with one bit for each of the IRQ0 through IRQ15.
40 * A level triggered irq is indicated by setting the corresponding bit to '1'.
41 */
42#define	ELCR_PORT	0x4d0
43
44static uint8_t elcr[2] = { 0x00, 0x00 };
45
46static int
47elcr_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
48	     uint32_t *eax, void *arg)
49{
50	int idx;
51
52	if (bytes != 1)
53		return (-1);
54
55	idx = port - ELCR_PORT;
56
57	if (in)
58		*eax = elcr[idx];
59	else
60		elcr[idx] = *eax;
61
62	return (0);
63}
64INOUT_PORT(elcr, ELCR_PORT + 0, IOPORT_F_INOUT, elcr_handler);
65INOUT_PORT(elcr, ELCR_PORT + 1, IOPORT_F_INOUT, elcr_handler);
66