2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2014 Tycho Nightingale <tycho.nightingale@pluribusnetworks.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <machine/vmm.h>
36 #include <machine/vmm_instruction_emul.h>
42 #include "vmm_ioport.h"
45 #define MAX_IOPORTS 1280
47 ioport_handler_func_t ioport_handler[MAX_IOPORTS] = {
48 [TIMER_MODE] = vatpit_handler,
49 [TIMER_CNTR0] = vatpit_handler,
50 [TIMER_CNTR1] = vatpit_handler,
51 [TIMER_CNTR2] = vatpit_handler,
52 [NMISC_PORT] = vatpit_nmisc_handler,
53 [IO_ICU1] = vatpic_master_handler,
54 [IO_ICU1 + ICU_IMR_OFFSET] = vatpic_master_handler,
55 [IO_ICU2] = vatpic_slave_handler,
56 [IO_ICU2 + ICU_IMR_OFFSET] = vatpic_slave_handler,
57 [IO_ELCR1] = vatpic_elc_handler,
58 [IO_ELCR2] = vatpic_elc_handler,
59 [IO_PMTMR] = vpmtmr_handler,
60 [IO_RTC] = vrtc_addr_handler,
61 [IO_RTC + 1] = vrtc_data_handler,
66 inout_instruction(struct vm_exit *vmexit)
70 static const char *iodesc[] = {
71 "outb", "outw", "outl",
73 "outsb", "outsw", "outsd",
74 "insb", "insw", "insd",
77 switch (vmexit->u.inout.bytes) {
89 if (vmexit->u.inout.in)
92 if (vmexit->u.inout.string)
95 KASSERT(index < nitems(iodesc), ("%s: invalid index %d",
98 return (iodesc[index]);
103 emulate_inout_port(struct vm *vm, int vcpuid, struct vm_exit *vmexit,
106 ioport_handler_func_t handler;
111 * If there is no handler for the I/O port then punt to userspace.
113 if (vmexit->u.inout.port >= MAX_IOPORTS ||
114 (handler = ioport_handler[vmexit->u.inout.port]) == NULL) {
119 mask = vie_size2mask(vmexit->u.inout.bytes);
121 if (!vmexit->u.inout.in) {
122 val = vmexit->u.inout.eax & mask;
125 error = (*handler)(vm, vcpuid, vmexit->u.inout.in,
126 vmexit->u.inout.port, vmexit->u.inout.bytes, &val);
129 * The value returned by this function is also the return value
130 * of vm_run(). This needs to be a positive number otherwise it
131 * can be interpreted as a "pseudo-error" like ERESTART.
133 * Enforce this by mapping all errors to EIO.
138 if (vmexit->u.inout.in) {
139 vmexit->u.inout.eax &= ~mask;
140 vmexit->u.inout.eax |= val & mask;
141 error = vm_set_register(vm, vcpuid, VM_REG_GUEST_RAX,
142 vmexit->u.inout.eax);
143 KASSERT(error == 0, ("emulate_ioport: error %d setting guest "
144 "rax register", error));
151 emulate_inout_str(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu)
154 return (0); /* Return to userspace to finish emulation */
158 vm_handle_inout(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu)
162 bytes = vmexit->u.inout.bytes;
163 KASSERT(bytes == 1 || bytes == 2 || bytes == 4,
164 ("vm_handle_inout: invalid operand size %d", bytes));
166 if (vmexit->u.inout.string)
167 error = emulate_inout_str(vm, vcpuid, vmexit, retu);
169 error = emulate_inout_port(vm, vcpuid, vmexit, retu);
171 VCPU_CTR4(vm, vcpuid, "%s%s 0x%04x: %s",
172 vmexit->u.inout.rep ? "rep " : "",
173 inout_instruction(vmexit),
174 vmexit->u.inout.port,
175 error ? "error" : (*retu ? "userspace" : "handled"));