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Restrict the faulting addresses we call pmap_fault from to just those that
[FreeBSD/FreeBSD.git] / sys / arm64 / arm64 / cpu_errata.c
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2018 Andrew Turner
5  * All rights reserved.
6  *
7  * This software was developed by SRI International and the University of
8  * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
9  * ("CTSRD"), as part of the DARPA CRASH research programme.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32
33 #include "opt_platform.h"
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #include <sys/param.h>
39 #include <sys/kernel.h>
40 #include <sys/pcpu.h>
41
42 #include <machine/cpu.h>
43
44 #ifdef DEV_PSCI
45 #include <dev/psci/psci.h>
46 #endif
47
48 typedef void (cpu_quirk_install)(void);
49 struct cpu_quirks {
50         cpu_quirk_install *quirk_install;
51         u_int           midr_mask;
52         u_int           midr_value;
53 };
54
55 static cpu_quirk_install install_psci_bp_hardening;
56
57 static struct cpu_quirks cpu_quirks[] = {
58         {
59                 .midr_mask = CPU_IMPL_MASK | CPU_PART_MASK,
60                 .midr_value = CPU_ID_RAW(CPU_IMPL_ARM, CPU_PART_CORTEX_A57,0,0),
61                 .quirk_install = install_psci_bp_hardening,
62         },
63         {
64                 .midr_mask = CPU_IMPL_MASK | CPU_PART_MASK,
65                 .midr_value = CPU_ID_RAW(CPU_IMPL_ARM, CPU_PART_CORTEX_A72,0,0),
66                 .quirk_install = install_psci_bp_hardening,
67         },
68         {
69                 .midr_mask = CPU_IMPL_MASK | CPU_PART_MASK,
70                 .midr_value = CPU_ID_RAW(CPU_IMPL_ARM, CPU_PART_CORTEX_A73,0,0),
71                 .quirk_install = install_psci_bp_hardening,
72         },
73         {
74                 .midr_mask = CPU_IMPL_MASK | CPU_PART_MASK,
75                 .midr_value = CPU_ID_RAW(CPU_IMPL_ARM, CPU_PART_CORTEX_A75,0,0),
76                 .quirk_install = install_psci_bp_hardening,
77         },
78 };
79
80 static void
81 install_psci_bp_hardening(void)
82 {
83
84 #ifdef DEV_PSCI
85         PCPU_SET(bp_harden, psci_get_version);
86 #endif
87 }
88
89 void
90 install_cpu_errata(void)
91 {
92         u_int midr;
93         size_t i;
94
95         midr = get_midr();
96
97         for (i = 0; i < nitems(cpu_quirks); i++) {
98                 if ((midr & cpu_quirks[i].midr_mask) ==
99                     cpu_quirks[i].midr_value) {
100                         cpu_quirks[i].quirk_install();
101                 }
102         }
103 }