172 lines
4.4 KiB
C
172 lines
4.4 KiB
C
/*-
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* Copyright (c) 2014 Tycho Nightingale <tycho.nightingale@pluribusnetworks.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/cpuset.h>
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#include <sys/systm.h>
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#include <vm/vm.h>
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#include <machine/vmm.h>
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#include <machine/vmm_instruction_emul.h>
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#include <x86/psl.h>
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#include "vatpic.h"
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#include "vatpit.h"
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#include "vmm_ioport.h"
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#include "vmm_ktr.h"
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#define MAX_IOPORTS 1280
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ioport_handler_func_t ioport_handler[MAX_IOPORTS] = {
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[TIMER_MODE] = vatpit_handler,
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[TIMER_CNTR0] = vatpit_handler,
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[TIMER_CNTR1] = vatpit_handler,
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[TIMER_CNTR2] = vatpit_handler,
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[NMISC_PORT] = vatpit_nmisc_handler,
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[IO_ICU1] = vatpic_master_handler,
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[IO_ICU1 + ICU_IMR_OFFSET] = vatpic_master_handler,
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[IO_ICU2] = vatpic_slave_handler,
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[IO_ICU2 + ICU_IMR_OFFSET] = vatpic_slave_handler,
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[IO_ELCR1] = vatpic_elc_handler,
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[IO_ELCR2] = vatpic_elc_handler,
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};
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#ifdef KTR
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static const char *
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inout_instruction(struct vm_exit *vmexit)
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{
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int index;
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static const char *iodesc[] = {
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"outb", "outw", "outl",
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"inb", "inw", "inl",
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"outsb", "outsw", "outsd"
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"insb", "insw", "insd",
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};
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switch (vmexit->u.inout.bytes) {
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case 1:
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index = 0;
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break;
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case 2:
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index = 1;
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break;
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default:
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index = 2;
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break;
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}
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if (vmexit->u.inout.in)
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index += 3;
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if (vmexit->u.inout.string)
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index += 6;
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KASSERT(index < nitems(iodesc), ("%s: invalid index %d",
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__func__, index));
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return (iodesc[index]);
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}
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#endif /* KTR */
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static int
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emulate_inout_port(struct vm *vm, int vcpuid, struct vm_exit *vmexit,
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bool *retu)
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{
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ioport_handler_func_t handler;
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uint32_t mask, val;
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int error;
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error = 0;
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*retu = true;
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if (vmexit->u.inout.port >= MAX_IOPORTS)
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goto done;
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handler = ioport_handler[vmexit->u.inout.port];
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if (handler == NULL)
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goto done;
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mask = vie_size2mask(vmexit->u.inout.bytes);
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if (!vmexit->u.inout.in) {
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val = vmexit->u.inout.eax & mask;
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}
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error = (*handler)(vm, vcpuid, vmexit->u.inout.in,
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vmexit->u.inout.port, vmexit->u.inout.bytes, &val);
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if (!error) {
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*retu = false;
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if (vmexit->u.inout.in) {
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vmexit->u.inout.eax &= ~mask;
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vmexit->u.inout.eax |= val & mask;
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error = vm_set_register(vm, vcpuid,
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VM_REG_GUEST_RAX, vmexit->u.inout.eax);
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KASSERT(error == 0, ("emulate_ioport: error %d "
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"setting guest rax register", error));
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}
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}
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done:
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return (error);
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}
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static int
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emulate_inout_str(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu)
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{
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*retu = true;
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return (0); /* Return to userspace to finish emulation */
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}
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int
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vm_handle_inout(struct vm *vm, int vcpuid, struct vm_exit *vmexit, bool *retu)
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{
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int bytes, error;
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bytes = vmexit->u.inout.bytes;
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KASSERT(bytes == 1 || bytes == 2 || bytes == 4,
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("vm_handle_inout: invalid operand size %d", bytes));
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if (vmexit->u.inout.string)
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error = emulate_inout_str(vm, vcpuid, vmexit, retu);
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else
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error = emulate_inout_port(vm, vcpuid, vmexit, retu);
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VCPU_CTR4(vm, vcpuid, "%s%s 0x%04x: %s",
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vmexit->u.inout.rep ? "rep " : "",
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inout_instruction(vmexit),
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vmexit->u.inout.port,
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error ? "error" : (*retu ? "userspace" : "handled"));
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return (error);
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}
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