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 #include <sys/param.h>
30 #include <sys/types.h>
31
32 #include <machine/vmm.h>
33 #include <vmmapi.h>
34
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <assert.h>
38
39 #include "bhyverun.h"
40 #include "spinup_ap.h"
41
42 static void
spinup_ap_realmode(struct vcpu * newcpu,uint64_t rip)43 spinup_ap_realmode(struct vcpu *newcpu, uint64_t rip)
44 {
45 int vector, error;
46 uint16_t cs;
47 uint64_t desc_base;
48 uint32_t desc_limit, desc_access;
49
50 vector = rip >> PAGE_SHIFT;
51
52 /*
53 * Update the %cs and %rip of the guest so that it starts
54 * executing real mode code at 'vector << 12'.
55 */
56 error = vm_set_register(newcpu, VM_REG_GUEST_RIP, 0);
57 assert(error == 0);
58
59 error = vm_get_desc(newcpu, VM_REG_GUEST_CS, &desc_base,
60 &desc_limit, &desc_access);
61 assert(error == 0);
62
63 desc_base = vector << PAGE_SHIFT;
64 error = vm_set_desc(newcpu, VM_REG_GUEST_CS,
65 desc_base, desc_limit, desc_access);
66 assert(error == 0);
67
68 cs = (vector << PAGE_SHIFT) >> 4;
69 error = vm_set_register(newcpu, VM_REG_GUEST_CS, cs);
70 assert(error == 0);
71 }
72
73 void
spinup_ap(struct vcpu * newcpu,uint64_t rip)74 spinup_ap(struct vcpu *newcpu, uint64_t rip)
75 {
76 int error;
77
78 error = vcpu_reset(newcpu);
79 assert(error == 0);
80
81 spinup_ap_realmode(newcpu, rip);
82
83 vm_resume_cpu(newcpu);
84 }
85