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