2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2018 Andrew Turner
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.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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
33 #include "opt_platform.h"
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include <sys/param.h>
39 #include <sys/kernel.h>
41 #include <sys/systm.h>
43 #include <machine/cpu.h>
45 #include <dev/psci/smccc.h>
47 typedef void (cpu_quirk_install)(void);
49 cpu_quirk_install *quirk_install;
58 } ssbd_method = SSBD_KERNEL;
60 static cpu_quirk_install install_psci_bp_hardening;
61 static cpu_quirk_install install_ssbd_workaround;
63 static struct cpu_quirks cpu_quirks[] = {
65 .midr_mask = CPU_IMPL_MASK | CPU_PART_MASK,
66 .midr_value = CPU_ID_RAW(CPU_IMPL_ARM, CPU_PART_CORTEX_A57,0,0),
67 .quirk_install = install_psci_bp_hardening,
70 .midr_mask = CPU_IMPL_MASK | CPU_PART_MASK,
71 .midr_value = CPU_ID_RAW(CPU_IMPL_ARM, CPU_PART_CORTEX_A72,0,0),
72 .quirk_install = install_psci_bp_hardening,
75 .midr_mask = CPU_IMPL_MASK | CPU_PART_MASK,
76 .midr_value = CPU_ID_RAW(CPU_IMPL_ARM, CPU_PART_CORTEX_A73,0,0),
77 .quirk_install = install_psci_bp_hardening,
80 .midr_mask = CPU_IMPL_MASK | CPU_PART_MASK,
81 .midr_value = CPU_ID_RAW(CPU_IMPL_ARM, CPU_PART_CORTEX_A75,0,0),
82 .quirk_install = install_psci_bp_hardening,
85 .midr_mask = CPU_IMPL_MASK | CPU_PART_MASK,
87 CPU_ID_RAW(CPU_IMPL_CAVIUM, CPU_PART_THUNDERX2, 0,0),
88 .quirk_install = install_psci_bp_hardening,
93 .quirk_install = install_ssbd_workaround,
98 install_psci_bp_hardening(void)
101 if (smccc_arch_features(SMCCC_ARCH_WORKAROUND_1) != SMCCC_RET_SUCCESS)
104 PCPU_SET(bp_harden, smccc_arch_workaround_1);
108 install_ssbd_workaround(void)
112 if (PCPU_GET(cpuid) == 0) {
113 env = kern_getenv("kern.cfg.ssbd");
115 if (strcmp(env, "force-on") == 0) {
116 ssbd_method = SSBD_FORCE_ON;
117 } else if (strcmp(env, "force-off") == 0) {
118 ssbd_method = SSBD_FORCE_OFF;
123 /* Enable the workaround on this CPU if it's enabled in the firmware */
124 if (smccc_arch_features(SMCCC_ARCH_WORKAROUND_2) != SMCCC_RET_SUCCESS)
127 switch(ssbd_method) {
129 smccc_arch_workaround_2(1);
132 smccc_arch_workaround_2(0);
136 PCPU_SET(ssbd, smccc_arch_workaround_2);
142 install_cpu_errata(void)
149 for (i = 0; i < nitems(cpu_quirks); i++) {
150 if ((midr & cpu_quirks[i].midr_mask) ==
151 cpu_quirks[i].midr_value) {
152 cpu_quirks[i].quirk_install();