1*f651b525SAndrew Turner /*- 2*f651b525SAndrew Turner * SPDX-License-Identifier: BSD-2-Clause 3*f651b525SAndrew Turner * 4*f651b525SAndrew Turner * Copyright (c) 2018 Andrew Turner 5*f651b525SAndrew Turner * 6*f651b525SAndrew Turner * This software was developed by SRI International and the University of 7*f651b525SAndrew Turner * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237 8*f651b525SAndrew Turner * ("CTSRD"), as part of the DARPA CRASH research programme. 9*f651b525SAndrew Turner * 10*f651b525SAndrew Turner * Redistribution and use in source and binary forms, with or without 11*f651b525SAndrew Turner * modification, are permitted provided that the following conditions 12*f651b525SAndrew Turner * are met: 13*f651b525SAndrew Turner * 1. Redistributions of source code must retain the above copyright 14*f651b525SAndrew Turner * notice, this list of conditions and the following disclaimer. 15*f651b525SAndrew Turner * 2. Redistributions in binary form must reproduce the above copyright 16*f651b525SAndrew Turner * notice, this list of conditions and the following disclaimer in the 17*f651b525SAndrew Turner * documentation and/or other materials provided with the distribution. 18*f651b525SAndrew Turner * 19*f651b525SAndrew Turner * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20*f651b525SAndrew Turner * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21*f651b525SAndrew Turner * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22*f651b525SAndrew Turner * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23*f651b525SAndrew Turner * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24*f651b525SAndrew Turner * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25*f651b525SAndrew Turner * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26*f651b525SAndrew Turner * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27*f651b525SAndrew Turner * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28*f651b525SAndrew Turner * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29*f651b525SAndrew Turner * SUCH DAMAGE. 30*f651b525SAndrew Turner */ 31*f651b525SAndrew Turner 32*f651b525SAndrew Turner #include "opt_acpi.h" 33*f651b525SAndrew Turner #include "opt_platform.h" 34*f651b525SAndrew Turner 35*f651b525SAndrew Turner #include <sys/cdefs.h> 36*f651b525SAndrew Turner __FBSDID("$FreeBSD$"); 37*f651b525SAndrew Turner 38*f651b525SAndrew Turner #include <sys/param.h> 39*f651b525SAndrew Turner #include <sys/systm.h> 40*f651b525SAndrew Turner #include <sys/kernel.h> 41*f651b525SAndrew Turner 42*f651b525SAndrew Turner #include <dev/psci/psci.h> 43*f651b525SAndrew Turner #include <dev/psci/smccc.h> 44*f651b525SAndrew Turner 45*f651b525SAndrew Turner #define SMCCC_VERSION_1_0 0x10000 46*f651b525SAndrew Turner 47*f651b525SAndrew Turner /* Assume 1.0 until we detect a later version */ 48*f651b525SAndrew Turner static uint32_t smccc_version = SMCCC_VERSION_1_0; 49*f651b525SAndrew Turner 50*f651b525SAndrew Turner static void 51*f651b525SAndrew Turner smccc_init(void *dummy) 52*f651b525SAndrew Turner { 53*f651b525SAndrew Turner int32_t features; 54*f651b525SAndrew Turner uint32_t ret; 55*f651b525SAndrew Turner 56*f651b525SAndrew Turner features = psci_features(SMCCC_VERSION); 57*f651b525SAndrew Turner if (features != PSCI_RETVAL_NOT_SUPPORTED) { 58*f651b525SAndrew Turner ret = psci_call(SMCCC_VERSION, 0, 0, 0); 59*f651b525SAndrew Turner /* This should always be the case as we checked it above */ 60*f651b525SAndrew Turner if (ret > 0) 61*f651b525SAndrew Turner smccc_version = ret; 62*f651b525SAndrew Turner } 63*f651b525SAndrew Turner 64*f651b525SAndrew Turner if (bootverbose) { 65*f651b525SAndrew Turner printf("Found SMCCC version %u.%u\n", 66*f651b525SAndrew Turner SMCCC_VERSION_MAJOR(smccc_version), 67*f651b525SAndrew Turner SMCCC_VERSION_MINOR(smccc_version)); 68*f651b525SAndrew Turner } 69*f651b525SAndrew Turner } 70*f651b525SAndrew Turner SYSINIT(smccc_start, SI_SUB_DRIVERS, SI_ORDER_ANY, smccc_init, NULL); 71*f651b525SAndrew Turner 72*f651b525SAndrew Turner int32_t 73*f651b525SAndrew Turner smccc_arch_features(uint32_t smccc_func_id) 74*f651b525SAndrew Turner { 75*f651b525SAndrew Turner 76*f651b525SAndrew Turner if (smccc_version == SMCCC_VERSION_1_0) 77*f651b525SAndrew Turner return (PSCI_RETVAL_NOT_SUPPORTED); 78*f651b525SAndrew Turner 79*f651b525SAndrew Turner return (psci_call(SMCCC_ARCH_FEATURES, smccc_func_id, 0, 0)); 80*f651b525SAndrew Turner } 81*f651b525SAndrew Turner 82*f651b525SAndrew Turner /* 83*f651b525SAndrew Turner * The SMCCC handler for Spectre variant 2: Branch target injection. 84*f651b525SAndrew Turner * (CVE-2017-5715) 85*f651b525SAndrew Turner */ 86*f651b525SAndrew Turner int 87*f651b525SAndrew Turner smccc_arch_workaround_1(void) 88*f651b525SAndrew Turner { 89*f651b525SAndrew Turner 90*f651b525SAndrew Turner KASSERT(smccc_version != SMCCC_VERSION_1_0, 91*f651b525SAndrew Turner ("SMCCC arch workaround 1 called with an invalid SMCCC interface")); 92*f651b525SAndrew Turner return (psci_call(SMCCC_ARCH_WORKAROUND_1, 0, 0, 0)); 93*f651b525SAndrew Turner } 94