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/cdefs.h> 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 40 #include <dev/psci/psci.h> 41 #include <dev/psci/smccc.h> 42 43 #define SMCCC_VERSION_1_0 0x10000 44 45 /* Assume 1.0 until we detect a later version */ 46 static uint32_t smccc_version; 47 48 void 49 smccc_init(void) 50 { 51 int32_t features; 52 uint32_t ret; 53 54 smccc_version = SMCCC_VERSION_1_0; 55 features = psci_features(SMCCC_VERSION); 56 if (features != PSCI_RETVAL_NOT_SUPPORTED) { 57 ret = psci_call(SMCCC_VERSION, 0, 0, 0); 58 /* This should always be the case as we checked it above */ 59 if (ret > 0) 60 smccc_version = ret; 61 } 62 63 if (bootverbose) { 64 printf("Found SMCCC version %u.%u\n", 65 SMCCC_VERSION_MAJOR(smccc_version), 66 SMCCC_VERSION_MINOR(smccc_version)); 67 } 68 } 69 70 uint32_t 71 smccc_get_version(void) 72 { 73 MPASS(smccc_version != 0); 74 return (smccc_version); 75 } 76 77 int32_t 78 smccc_arch_features(uint32_t smccc_func_id) 79 { 80 81 MPASS(smccc_version != 0); 82 if (smccc_version == SMCCC_VERSION_1_0) 83 return (PSCI_RETVAL_NOT_SUPPORTED); 84 85 return (psci_call(SMCCC_ARCH_FEATURES, smccc_func_id, 0, 0)); 86 } 87 88 /* 89 * The SMCCC handler for Spectre variant 2: Branch target injection. 90 * (CVE-2017-5715) 91 */ 92 int 93 smccc_arch_workaround_1(void) 94 { 95 96 MPASS(smccc_version != 0); 97 KASSERT(smccc_version != SMCCC_VERSION_1_0, 98 ("SMCCC arch workaround 1 called with an invalid SMCCC interface")); 99 return (psci_call(SMCCC_ARCH_WORKAROUND_1, 0, 0, 0)); 100 } 101 102 int 103 smccc_arch_workaround_2(int enable) 104 { 105 106 MPASS(smccc_version != 0); 107 KASSERT(smccc_version != SMCCC_VERSION_1_0, 108 ("SMCCC arch workaround 2 called with an invalid SMCCC interface")); 109 return (psci_call(SMCCC_ARCH_WORKAROUND_2, enable, 0, 0)); 110 } 111