/*-
 * Copyright 2014 John Baldwin
 * Copyright 2019 Stephen J. Kiernan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      from: Id: machdep.c,v 1.193 1996/06/18 01:22:04 bde Exp
 */

#include <sys/param.h>
#include <sys/systm.h>

#include <dev/smbios/smbios.h>

static const struct {
        const char      *vm_bname;
        int             vm_guest;
} vm_bnames[] = {
        { "QEMU",       VM_GUEST_VM },          /* QEMU */
        { "Plex86",     VM_GUEST_VM },          /* Plex86 */
        { "Bochs",      VM_GUEST_VM },          /* Bochs */
        { "Xen",        VM_GUEST_XEN },         /* Xen */
        { "BHYVE",      VM_GUEST_BHYVE },       /* bhyve */
        { "Seabios",    VM_GUEST_KVM },         /* KVM */
};

static const struct {
        const char      *vm_pname;
        int             vm_guest;
} vm_pnames[] = {
        { "VMware Virtual Platform",    VM_GUEST_VMWARE },
        { "Virtual Machine",            VM_GUEST_VM }, /* Microsoft VirtualPC */
        { "QEMU Virtual Machine",       VM_GUEST_VM },
        { "VirtualBox",                 VM_GUEST_VBOX },
        { "Parallels Virtual Platform", VM_GUEST_PARALLELS },
        { "KVM",                        VM_GUEST_KVM },
};

void
identify_hypervisor_smbios(void)
{
        char *p;
        int i;

        /*
         * Some platforms, e.g., amd64, have other ways of detecting what kind
         * of hypervisor we may be running under.  Make sure we don't clobber a
         * more specific vm_guest that's been previously detected.
         */
        if (vm_guest != VM_GUEST_NO && vm_guest != VM_GUEST_VM)
                return;

        /*
         * XXX: Some of these entries may not be needed since they were
         * added to FreeBSD before the checks above.
         */
        p = kern_getenv("smbios.bios.vendor");
        if (p != NULL) {
                for (i = 0; i < nitems(vm_bnames); i++)
                        if (strcmp(p, vm_bnames[i].vm_bname) == 0) {
                                vm_guest = vm_bnames[i].vm_guest;
                                /* If we have a specific match, return */
                                if (vm_guest != VM_GUEST_VM) {
                                        freeenv(p);
                                        return;
                                }
                                /*
                                 * We are done with bnames, but there might be
                                 * a more specific match in the pnames
                                 */
                                break;
                        }
                freeenv(p);
        }
        p = kern_getenv("smbios.system.product");
        if (p != NULL) {
                for (i = 0; i < nitems(vm_pnames); i++)
                        if (strcmp(p, vm_pnames[i].vm_pname) == 0) {
                                vm_guest = vm_pnames[i].vm_guest;
                                freeenv(p);
                                return;
                        }
                freeenv(p);
        }
}