1f651b525SAndrew Turner /*- 2f651b525SAndrew Turner * SPDX-License-Identifier: BSD-2-Clause 3f651b525SAndrew Turner * 4f651b525SAndrew Turner * Copyright (c) 2018 Andrew Turner 5f651b525SAndrew Turner * 6f651b525SAndrew Turner * This software was developed by SRI International and the University of 7f651b525SAndrew Turner * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237 8f651b525SAndrew Turner * ("CTSRD"), as part of the DARPA CRASH research programme. 9f651b525SAndrew Turner * 10f651b525SAndrew Turner * Redistribution and use in source and binary forms, with or without 11f651b525SAndrew Turner * modification, are permitted provided that the following conditions 12f651b525SAndrew Turner * are met: 13f651b525SAndrew Turner * 1. Redistributions of source code must retain the above copyright 14f651b525SAndrew Turner * notice, this list of conditions and the following disclaimer. 15f651b525SAndrew Turner * 2. Redistributions in binary form must reproduce the above copyright 16f651b525SAndrew Turner * notice, this list of conditions and the following disclaimer in the 17f651b525SAndrew Turner * documentation and/or other materials provided with the distribution. 18f651b525SAndrew Turner * 19f651b525SAndrew Turner * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20f651b525SAndrew Turner * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21f651b525SAndrew Turner * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22f651b525SAndrew Turner * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23f651b525SAndrew Turner * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24f651b525SAndrew Turner * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25f651b525SAndrew Turner * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26f651b525SAndrew Turner * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27f651b525SAndrew Turner * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28f651b525SAndrew Turner * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29f651b525SAndrew Turner * SUCH DAMAGE. 30f651b525SAndrew Turner */ 31f651b525SAndrew Turner 32f651b525SAndrew Turner #include "opt_acpi.h" 33f651b525SAndrew Turner #include "opt_platform.h" 34f651b525SAndrew Turner 35f651b525SAndrew Turner #include <sys/cdefs.h> 36f651b525SAndrew Turner #include <sys/param.h> 37f651b525SAndrew Turner #include <sys/systm.h> 38f651b525SAndrew Turner #include <sys/kernel.h> 39f651b525SAndrew Turner 40f651b525SAndrew Turner #include <dev/psci/psci.h> 41f651b525SAndrew Turner #include <dev/psci/smccc.h> 42f651b525SAndrew Turner 43f651b525SAndrew Turner #define SMCCC_VERSION_1_0 0x10000 44f651b525SAndrew Turner 45f651b525SAndrew Turner /* Assume 1.0 until we detect a later version */ 46*8a723e2bSAndrew Turner static uint32_t smccc_version; 47f651b525SAndrew Turner 480600af1fSAndrew Turner void 490600af1fSAndrew Turner smccc_init(void) 50f651b525SAndrew Turner { 51f651b525SAndrew Turner int32_t features; 52f651b525SAndrew Turner uint32_t ret; 53f651b525SAndrew Turner 54*8a723e2bSAndrew Turner smccc_version = SMCCC_VERSION_1_0; 55f651b525SAndrew Turner features = psci_features(SMCCC_VERSION); 56f651b525SAndrew Turner if (features != PSCI_RETVAL_NOT_SUPPORTED) { 57f651b525SAndrew Turner ret = psci_call(SMCCC_VERSION, 0, 0, 0); 58f651b525SAndrew Turner /* This should always be the case as we checked it above */ 59f651b525SAndrew Turner if (ret > 0) 60f651b525SAndrew Turner smccc_version = ret; 61f651b525SAndrew Turner } 62f651b525SAndrew Turner 63f651b525SAndrew Turner if (bootverbose) { 64f651b525SAndrew Turner printf("Found SMCCC version %u.%u\n", 65f651b525SAndrew Turner SMCCC_VERSION_MAJOR(smccc_version), 66f651b525SAndrew Turner SMCCC_VERSION_MINOR(smccc_version)); 67f651b525SAndrew Turner } 68f651b525SAndrew Turner } 690600af1fSAndrew Turner 700600af1fSAndrew Turner uint32_t 710600af1fSAndrew Turner smccc_get_version(void) 720600af1fSAndrew Turner { 73*8a723e2bSAndrew Turner MPASS(smccc_version != 0); 740600af1fSAndrew Turner return (smccc_version); 750600af1fSAndrew Turner } 76f651b525SAndrew Turner 77f651b525SAndrew Turner int32_t 78f651b525SAndrew Turner smccc_arch_features(uint32_t smccc_func_id) 79f651b525SAndrew Turner { 80f651b525SAndrew Turner 81*8a723e2bSAndrew Turner MPASS(smccc_version != 0); 82f651b525SAndrew Turner if (smccc_version == SMCCC_VERSION_1_0) 83f651b525SAndrew Turner return (PSCI_RETVAL_NOT_SUPPORTED); 84f651b525SAndrew Turner 85f651b525SAndrew Turner return (psci_call(SMCCC_ARCH_FEATURES, smccc_func_id, 0, 0)); 86f651b525SAndrew Turner } 87f651b525SAndrew Turner 88f651b525SAndrew Turner /* 89f651b525SAndrew Turner * The SMCCC handler for Spectre variant 2: Branch target injection. 90f651b525SAndrew Turner * (CVE-2017-5715) 91f651b525SAndrew Turner */ 92f651b525SAndrew Turner int 93f651b525SAndrew Turner smccc_arch_workaround_1(void) 94f651b525SAndrew Turner { 95f651b525SAndrew Turner 96*8a723e2bSAndrew Turner MPASS(smccc_version != 0); 97f651b525SAndrew Turner KASSERT(smccc_version != SMCCC_VERSION_1_0, 98f651b525SAndrew Turner ("SMCCC arch workaround 1 called with an invalid SMCCC interface")); 99f651b525SAndrew Turner return (psci_call(SMCCC_ARCH_WORKAROUND_1, 0, 0, 0)); 100f651b525SAndrew Turner } 1010594061eSAndrew Turner 1020594061eSAndrew Turner int 103100a6d19SAndrew Turner smccc_arch_workaround_2(int enable) 1040594061eSAndrew Turner { 1050594061eSAndrew Turner 106*8a723e2bSAndrew Turner MPASS(smccc_version != 0); 1070594061eSAndrew Turner KASSERT(smccc_version != SMCCC_VERSION_1_0, 1080594061eSAndrew Turner ("SMCCC arch workaround 2 called with an invalid SMCCC interface")); 109100a6d19SAndrew Turner return (psci_call(SMCCC_ARCH_WORKAROUND_2, enable, 0, 0)); 1100594061eSAndrew Turner } 111