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156 lines
4.1 KiB
C
156 lines
4.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2018 Andrew Turner
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "opt_acpi.h"
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#include "opt_platform.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <dev/psci/psci.h>
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#include <dev/psci/smccc.h>
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#define SMCCC_VERSION_1_0 0x10000
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/* Assume 1.0 until we detect a later version */
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static uint32_t smccc_version;
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void
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smccc_init(void)
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{
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int32_t features;
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uint32_t ret;
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smccc_version = SMCCC_VERSION_1_0;
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features = psci_features(SMCCC_VERSION);
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if (features != PSCI_RETVAL_NOT_SUPPORTED) {
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ret = psci_call(SMCCC_VERSION, 0, 0, 0);
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/* This should always be the case as we checked it above */
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if (ret > 0)
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smccc_version = ret;
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}
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if (bootverbose) {
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printf("Found SMCCC version %u.%u\n",
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SMCCC_VERSION_MAJOR(smccc_version),
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SMCCC_VERSION_MINOR(smccc_version));
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}
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}
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static int
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smccc_probe(device_t dev)
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{
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int32_t version;
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/*
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* If the version is not implemented then we treat it as SMCCC 1.0
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*/
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if (psci_features(SMCCC_VERSION) == PSCI_RETVAL_NOT_SUPPORTED ||
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(version = arm_smccc_invoke(SMCCC_VERSION, NULL)) <= 0) {
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device_set_desc(dev, "ARM SMCCC v1.0");
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return (0);
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}
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device_set_descf(dev, "ARM SMCCC v%d.%d", SMCCC_VERSION_MAJOR(version),
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SMCCC_VERSION_MINOR(version));
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return (0);
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}
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static int
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smccc_attach(device_t dev)
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{
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bus_attach_children(dev);
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return (0);
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}
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uint32_t
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smccc_get_version(void)
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{
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MPASS(smccc_version != 0);
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return (smccc_version);
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}
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int32_t
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smccc_arch_features(uint32_t smccc_func_id)
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{
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MPASS(smccc_version != 0);
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if (smccc_version == SMCCC_VERSION_1_0)
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return (PSCI_RETVAL_NOT_SUPPORTED);
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return (arm_smccc_invoke(SMCCC_ARCH_FEATURES, smccc_func_id, NULL));
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}
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/*
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* The SMCCC handler for Spectre variant 2: Branch target injection.
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* (CVE-2017-5715)
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*/
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int
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smccc_arch_workaround_1(void)
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{
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MPASS(smccc_version != 0);
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KASSERT(smccc_version != SMCCC_VERSION_1_0,
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("SMCCC arch workaround 1 called with an invalid SMCCC interface"));
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return (arm_smccc_invoke(SMCCC_ARCH_WORKAROUND_1, NULL));
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}
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int
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smccc_arch_workaround_2(int enable)
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{
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MPASS(smccc_version != 0);
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KASSERT(smccc_version != SMCCC_VERSION_1_0,
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("SMCCC arch workaround 2 called with an invalid SMCCC interface"));
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return (arm_smccc_invoke(SMCCC_ARCH_WORKAROUND_2, enable, NULL));
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}
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static device_method_t smccc_methods[] = {
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DEVMETHOD(device_probe, smccc_probe),
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DEVMETHOD(device_attach, smccc_attach),
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DEVMETHOD(bus_add_child, bus_generic_add_child),
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DEVMETHOD_END
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};
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static driver_t smccc_driver = {
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"smccc",
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smccc_methods,
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0,
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};
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EARLY_DRIVER_MODULE(smccc, psci, smccc_driver, 0, 0,
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BUS_PASS_CPU + BUS_PASS_ORDER_FIRST);
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