1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2018 Andrew Turner
5 *
6 * This software was developed by SRI International and the University of
7 * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
8 * ("CTSRD"), as part of the DARPA CRASH research programme.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include "opt_acpi.h"
33 #include "opt_platform.h"
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38
39 #include <dev/psci/psci.h>
40 #include <dev/psci/smccc.h>
41
42 #define SMCCC_VERSION_1_0 0x10000
43
44 /* Assume 1.0 until we detect a later version */
45 static uint32_t smccc_version;
46
47 void
smccc_init(void)48 smccc_init(void)
49 {
50 int32_t features;
51 uint32_t ret;
52
53 smccc_version = SMCCC_VERSION_1_0;
54 features = psci_features(SMCCC_VERSION);
55 if (features != PSCI_RETVAL_NOT_SUPPORTED) {
56 ret = psci_call(SMCCC_VERSION, 0, 0, 0);
57 /* This should always be the case as we checked it above */
58 if (ret > 0)
59 smccc_version = ret;
60 }
61
62 if (bootverbose) {
63 printf("Found SMCCC version %u.%u\n",
64 SMCCC_VERSION_MAJOR(smccc_version),
65 SMCCC_VERSION_MINOR(smccc_version));
66 }
67 }
68
69 uint32_t
smccc_get_version(void)70 smccc_get_version(void)
71 {
72 MPASS(smccc_version != 0);
73 return (smccc_version);
74 }
75
76 int32_t
smccc_arch_features(uint32_t smccc_func_id)77 smccc_arch_features(uint32_t smccc_func_id)
78 {
79
80 MPASS(smccc_version != 0);
81 if (smccc_version == SMCCC_VERSION_1_0)
82 return (PSCI_RETVAL_NOT_SUPPORTED);
83
84 return (psci_call(SMCCC_ARCH_FEATURES, smccc_func_id, 0, 0));
85 }
86
87 /*
88 * The SMCCC handler for Spectre variant 2: Branch target injection.
89 * (CVE-2017-5715)
90 */
91 int
smccc_arch_workaround_1(void)92 smccc_arch_workaround_1(void)
93 {
94
95 MPASS(smccc_version != 0);
96 KASSERT(smccc_version != SMCCC_VERSION_1_0,
97 ("SMCCC arch workaround 1 called with an invalid SMCCC interface"));
98 return (psci_call(SMCCC_ARCH_WORKAROUND_1, 0, 0, 0));
99 }
100
101 int
smccc_arch_workaround_2(int enable)102 smccc_arch_workaround_2(int enable)
103 {
104
105 MPASS(smccc_version != 0);
106 KASSERT(smccc_version != SMCCC_VERSION_1_0,
107 ("SMCCC arch workaround 2 called with an invalid SMCCC interface"));
108 return (psci_call(SMCCC_ARCH_WORKAROUND_2, enable, 0, 0));
109 }
110