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 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 70 smccc_get_version(void) 71 { 72 MPASS(smccc_version != 0); 73 return (smccc_version); 74 } 75 76 int32_t 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 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 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