2 * Copyright (c) 2014 Tycho Nightingale <tycho.nightingale@pluribusnetworks.com>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
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>
38 #include <machine/vmm.h>
39 #include <machine/vmm_instruction_emul.h>
44 #include "vmm_ioport.h"
47 #define MAX_IOPORTS 1280
49 ioport_handler_func_t ioport_handler[MAX_IOPORTS] = {
50 [TIMER_MODE] = vatpit_handler,
51 [TIMER_CNTR0] = vatpit_handler,
52 [TIMER_CNTR1] = vatpit_handler,
53 [TIMER_CNTR2] = vatpit_handler,
54 [NMISC_PORT] = vatpit_nmisc_handler,
55 [IO_ICU1] = vatpic_master_handler,
56 [IO_ICU1 + ICU_IMR_OFFSET] = vatpic_master_handler,
57 [IO_ICU2] = vatpic_slave_handler,
58 [IO_ICU2 + ICU_IMR_OFFSET] = vatpic_slave_handler,
59 [IO_ELCR1] = vatpic_elc_handler,
60 [IO_ELCR2] = vatpic_elc_handler,
65 inout_instruction(struct vm_exit *vmexit)
69 static const char *iodesc[] = {
70 "outb", "outw", "outl",
72 "outsb", "outsw", "outsd"
73 "insb", "insw", "insd",
76 switch (vmexit->u.inout.bytes) {
88 if (vmexit->u.inout.in)
91 if (vmexit->u.inout.string)
94 KASSERT(index < nitems(iodesc), ("%s: invalid index %d",
97 return (iodesc[index]);
102 emulate_inout_port(struct vm *vm, int vcpuid, struct vm_exit *vmexit,
105 ioport_handler_func_t handler;
110 * If there is no handler for the I/O port then punt to userspace.
112 if (vmexit->u.inout.port >= MAX_IOPORTS ||
113 (handler = ioport_handler[vmexit->u.inout.port]) == NULL) {
118 mask = vie_size2mask(vmexit->u.inout.bytes);
120 if (!vmexit->u.inout.in) {
121 val = vmexit->u.inout.eax & mask;
124 error = (*handler)(vm, vcpuid, vmexit->u.inout.in,
125 vmexit->u.inout.port, vmexit->u.inout.bytes, &val);
128 * The value returned by this function is also the return value
129 * of vm_run(). This needs to be a positive number otherwise it
130 * can be interpreted as a "pseudo-error" like ERESTART.
132 * Enforce this by mapping all errors to EIO.
137 if (vmexit->u.inout.in) {
138 vmexit->u.inout.eax &= ~mask;
139 vmexit->u.inout.eax |= val & mask;
140 error = vm_set_register(vm, vcpuid, VM_REG_GUEST_RAX,
141 vmexit->u.inout.eax);
142 KASSERT(error == 0, ("emulate_ioport: error %d setting guest "
143 "rax register", error));
150 emulate_inout_str(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu)
153 return (0); /* Return to userspace to finish emulation */
157 vm_handle_inout(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu)
161 bytes = vmexit->u.inout.bytes;
162 KASSERT(bytes == 1 || bytes == 2 || bytes == 4,
163 ("vm_handle_inout: invalid operand size %d", bytes));
165 if (vmexit->u.inout.string)
166 error = emulate_inout_str(vm, vcpuid, vmexit, retu);
168 error = emulate_inout_port(vm, vcpuid, vmexit, retu);
170 VCPU_CTR4(vm, vcpuid, "%s%s 0x%04x: %s",
171 vmexit->u.inout.rep ? "rep " : "",
172 inout_instruction(vmexit),
173 vmexit->u.inout.port,
174 error ? "error" : (*retu ? "userspace" : "handled"));