1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2014 Tycho Nightingale <tycho.nightingale@pluribusnetworks.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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. 15 * 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 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 35 #include <machine/vmm.h> 36 #include <machine/vmm_instruction_emul.h> 37 38 #include "vatpic.h" 39 #include "vatpit.h" 40 #include "vpmtmr.h" 41 #include "vrtc.h" 42 #include "vmm_ioport.h" 43 #include "vmm_ktr.h" 44 45 #define MAX_IOPORTS 1280 46 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, 62 }; 63 64 #ifdef KTR 65 static const char * 66 inout_instruction(struct vm_exit *vmexit) 67 { 68 int index; 69 70 static const char *iodesc[] = { 71 "outb", "outw", "outl", 72 "inb", "inw", "inl", 73 "outsb", "outsw", "outsd", 74 "insb", "insw", "insd", 75 }; 76 77 switch (vmexit->u.inout.bytes) { 78 case 1: 79 index = 0; 80 break; 81 case 2: 82 index = 1; 83 break; 84 default: 85 index = 2; 86 break; 87 } 88 89 if (vmexit->u.inout.in) 90 index += 3; 91 92 if (vmexit->u.inout.string) 93 index += 6; 94 95 KASSERT(index < nitems(iodesc), ("%s: invalid index %d", 96 __func__, index)); 97 98 return (iodesc[index]); 99 } 100 #endif /* KTR */ 101 102 static int 103 emulate_inout_port(struct vm *vm, int vcpuid, struct vm_exit *vmexit, 104 bool *retu) 105 { 106 ioport_handler_func_t handler; 107 uint32_t mask, val; 108 int error; 109 110 /* 111 * If there is no handler for the I/O port then punt to userspace. 112 */ 113 if (vmexit->u.inout.port >= MAX_IOPORTS || 114 (handler = ioport_handler[vmexit->u.inout.port]) == NULL) { 115 *retu = true; 116 return (0); 117 } 118 119 mask = vie_size2mask(vmexit->u.inout.bytes); 120 121 if (!vmexit->u.inout.in) { 122 val = vmexit->u.inout.eax & mask; 123 } 124 125 error = (*handler)(vm, vcpuid, vmexit->u.inout.in, 126 vmexit->u.inout.port, vmexit->u.inout.bytes, &val); 127 if (error) { 128 /* 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. 132 * 133 * Enforce this by mapping all errors to EIO. 134 */ 135 return (EIO); 136 } 137 138 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)); 145 } 146 *retu = false; 147 return (0); 148 } 149 150 static int 151 emulate_inout_str(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu) 152 { 153 *retu = true; 154 return (0); /* Return to userspace to finish emulation */ 155 } 156 157 int 158 vm_handle_inout(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu) 159 { 160 int bytes, error; 161 162 bytes = vmexit->u.inout.bytes; 163 KASSERT(bytes == 1 || bytes == 2 || bytes == 4, 164 ("vm_handle_inout: invalid operand size %d", bytes)); 165 166 if (vmexit->u.inout.string) 167 error = emulate_inout_str(vm, vcpuid, vmexit, retu); 168 else 169 error = emulate_inout_port(vm, vcpuid, vmexit, retu); 170 171 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")); 176 177 return (error); 178 } 179