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("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 33 #include <machine/vmm.h> 34 #include <machine/vmm_instruction_emul.h> 35 36 #include "vatpic.h" 37 #include "vatpit.h" 38 #include "vpmtmr.h" 39 #include "vrtc.h" 40 #include "vmm_ioport.h" 41 #include "vmm_ktr.h" 42 43 #define MAX_IOPORTS 1280 44 45 ioport_handler_func_t ioport_handler[MAX_IOPORTS] = { 46 [TIMER_MODE] = vatpit_handler, 47 [TIMER_CNTR0] = vatpit_handler, 48 [TIMER_CNTR1] = vatpit_handler, 49 [TIMER_CNTR2] = vatpit_handler, 50 [NMISC_PORT] = vatpit_nmisc_handler, 51 [IO_ICU1] = vatpic_master_handler, 52 [IO_ICU1 + ICU_IMR_OFFSET] = vatpic_master_handler, 53 [IO_ICU2] = vatpic_slave_handler, 54 [IO_ICU2 + ICU_IMR_OFFSET] = vatpic_slave_handler, 55 [IO_ELCR1] = vatpic_elc_handler, 56 [IO_ELCR2] = vatpic_elc_handler, 57 [IO_PMTMR] = vpmtmr_handler, 58 [IO_RTC] = vrtc_addr_handler, 59 [IO_RTC + 1] = vrtc_data_handler, 60 }; 61 62 #ifdef KTR 63 static const char * 64 inout_instruction(struct vm_exit *vmexit) 65 { 66 int index; 67 68 static const char *iodesc[] = { 69 "outb", "outw", "outl", 70 "inb", "inw", "inl", 71 "outsb", "outsw", "outsd", 72 "insb", "insw", "insd", 73 }; 74 75 switch (vmexit->u.inout.bytes) { 76 case 1: 77 index = 0; 78 break; 79 case 2: 80 index = 1; 81 break; 82 default: 83 index = 2; 84 break; 85 } 86 87 if (vmexit->u.inout.in) 88 index += 3; 89 90 if (vmexit->u.inout.string) 91 index += 6; 92 93 KASSERT(index < nitems(iodesc), ("%s: invalid index %d", 94 __func__, index)); 95 96 return (iodesc[index]); 97 } 98 #endif /* KTR */ 99 100 static int 101 emulate_inout_port(struct vm *vm, int vcpuid, struct vm_exit *vmexit, 102 bool *retu) 103 { 104 ioport_handler_func_t handler; 105 uint32_t mask, val; 106 int error; 107 108 /* 109 * If there is no handler for the I/O port then punt to userspace. 110 */ 111 if (vmexit->u.inout.port >= MAX_IOPORTS || 112 (handler = ioport_handler[vmexit->u.inout.port]) == NULL) { 113 *retu = true; 114 return (0); 115 } 116 117 mask = vie_size2mask(vmexit->u.inout.bytes); 118 119 if (!vmexit->u.inout.in) { 120 val = vmexit->u.inout.eax & mask; 121 } 122 123 error = (*handler)(vm, vcpuid, vmexit->u.inout.in, 124 vmexit->u.inout.port, vmexit->u.inout.bytes, &val); 125 if (error) { 126 /* 127 * The value returned by this function is also the return value 128 * of vm_run(). This needs to be a positive number otherwise it 129 * can be interpreted as a "pseudo-error" like ERESTART. 130 * 131 * Enforce this by mapping all errors to EIO. 132 */ 133 return (EIO); 134 } 135 136 if (vmexit->u.inout.in) { 137 vmexit->u.inout.eax &= ~mask; 138 vmexit->u.inout.eax |= val & mask; 139 error = vm_set_register(vm, vcpuid, VM_REG_GUEST_RAX, 140 vmexit->u.inout.eax); 141 KASSERT(error == 0, ("emulate_ioport: error %d setting guest " 142 "rax register", error)); 143 } 144 *retu = false; 145 return (0); 146 } 147 148 static int 149 emulate_inout_str(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu) 150 { 151 *retu = true; 152 return (0); /* Return to userspace to finish emulation */ 153 } 154 155 int 156 vm_handle_inout(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu) 157 { 158 int bytes, error; 159 160 bytes = vmexit->u.inout.bytes; 161 KASSERT(bytes == 1 || bytes == 2 || bytes == 4, 162 ("vm_handle_inout: invalid operand size %d", bytes)); 163 164 if (vmexit->u.inout.string) 165 error = emulate_inout_str(vm, vcpuid, vmexit, retu); 166 else 167 error = emulate_inout_port(vm, vcpuid, vmexit, retu); 168 169 VCPU_CTR4(vm, vcpuid, "%s%s 0x%04x: %s", 170 vmexit->u.inout.rep ? "rep " : "", 171 inout_instruction(vmexit), 172 vmexit->u.inout.port, 173 error ? "error" : (*retu ? "userspace" : "handled")); 174 175 return (error); 176 } 177