1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2012 NetApp, Inc.
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 NETAPP, INC ``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 NETAPP, INC 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 * This file and its contents are supplied under the terms of the
30 * Common Development and Distribution License ("CDDL"), version 1.0.
31 * You may only use this file in accordance with the terms of version
32 * 1.0 of the CDDL.
33 *
34 * A full copy of the text of the CDDL should have accompanied this
35 * source. A copy of the CDDL is also available via the Internet at
36 * http://www.illumos.org/license/CDDL.
37 *
38 * Copyright 2020 Oxide Computer Company
39 */
40
41 #include <sys/cdefs.h>
42
43 #include <sys/param.h>
44 #include <sys/types.h>
45
46 #include <machine/vmm.h>
47 #include <vmmapi.h>
48
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <assert.h>
52
53 #include "bhyverun.h"
54 #include "spinup_ap.h"
55
56 #ifdef __FreeBSD__
57 static void
spinup_ap_realmode(struct vcpu * newcpu,uint64_t rip)58 spinup_ap_realmode(struct vcpu *newcpu, uint64_t rip)
59 {
60 int vector, error;
61 uint16_t cs;
62 uint64_t desc_base;
63 uint32_t desc_limit, desc_access;
64
65 vector = rip >> PAGE_SHIFT;
66
67 /*
68 * Update the %cs and %rip of the guest so that it starts
69 * executing real mode code at at 'vector << 12'.
70 */
71 error = vm_set_register(newcpu, VM_REG_GUEST_RIP, 0);
72 assert(error == 0);
73
74 error = vm_get_desc(newcpu, VM_REG_GUEST_CS, &desc_base,
75 &desc_limit, &desc_access);
76 assert(error == 0);
77
78 desc_base = vector << PAGE_SHIFT;
79 error = vm_set_desc(newcpu, VM_REG_GUEST_CS,
80 desc_base, desc_limit, desc_access);
81 assert(error == 0);
82
83 cs = (vector << PAGE_SHIFT) >> 4;
84 error = vm_set_register(newcpu, VM_REG_GUEST_CS, cs);
85 assert(error == 0);
86 }
87 #endif /* __FreeBSD__ */
88
89 void
spinup_ap(struct vcpu * newcpu,uint64_t rip)90 spinup_ap(struct vcpu *newcpu, uint64_t rip)
91 {
92 int error;
93
94 error = vcpu_reset(newcpu);
95 assert(error == 0);
96
97 #ifdef __FreeBSD__
98 spinup_ap_realmode(newcpu, rip);
99
100 vm_resume_cpu(newcpu);
101 #endif
102 }
103