vmm_ioport.c revision 268953 
1/*-
2 * Copyright (c) 2014 Tycho Nightingale <tycho.nightingale@pluribusnetworks.com>
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 THE AUTHOR ``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 THE AUTHOR 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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/10/sys/amd64/vmm/vmm_ioport.c 268953 2014-07-21 19:08:02Z jhb $");
29
30#include <sys/param.h>
31#include <sys/types.h>
32#include <sys/queue.h>
33#include <sys/cpuset.h>
34#include <sys/systm.h>
35
36#include <machine/vmm.h>
37
38#include "vatpic.h"
39#include "vatpit.h"
40#include "vmm_ioport.h"
41
42#define	MAX_IOPORTS		1280
43
44ioport_handler_func_t ioport_handler[MAX_IOPORTS] = {
45	[TIMER_MODE] = vatpit_handler,
46	[TIMER_CNTR0] = vatpit_handler,
47	[TIMER_CNTR1] = vatpit_handler,
48	[TIMER_CNTR2] = vatpit_handler,
49	[NMISC_PORT] = vatpit_nmisc_handler,
50	[IO_ICU1] = vatpic_master_handler,
51	[IO_ICU1 + ICU_IMR_OFFSET] = vatpic_master_handler,
52	[IO_ICU2] = vatpic_slave_handler,
53	[IO_ICU2 + ICU_IMR_OFFSET] = vatpic_slave_handler,
54	[IO_ELCR1] = vatpic_elc_handler,
55	[IO_ELCR2] = vatpic_elc_handler,
56};
57
58int
59emulate_ioport(struct vm *vm, int vcpuid, struct vm_exit *vmexit)
60{
61	ioport_handler_func_t handler;
62	uint32_t mask, val;
63	int error;
64
65	if (vmexit->u.inout.port >= MAX_IOPORTS)
66		return (-1);
67
68	handler = ioport_handler[vmexit->u.inout.port];
69	if (handler == NULL)
70		return (-1);
71
72	switch (vmexit->u.inout.bytes) {
73	case 1:
74		mask = 0xff;
75		break;
76	case 2:
77		mask = 0xffff;
78		break;
79	default:
80		mask = 0xffffffff;
81		break;
82	}
83
84	if (!vmexit->u.inout.in) {
85		val = vmexit->u.inout.eax & mask;
86	}
87
88	error = (*handler)(vm, vcpuid, vmexit->u.inout.in,
89	    vmexit->u.inout.port, vmexit->u.inout.bytes, &val);
90
91	if (!error && vmexit->u.inout.in) {
92		vmexit->u.inout.eax &= ~mask;
93		vmexit->u.inout.eax |= val & mask;
94	}
95
96	return (error);
97}
98