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0600af1ff1
To allow device drivers to call into SMCCC we need to initialise it earlier. As it depends on PSCI, and that is detected via ACPI or FDT move the call to smccc_init to the PSCI driver. Add a function for drivers to read the smccc version, or 0 if smccc is not present.
107 lines
3.1 KiB
C
107 lines
3.1 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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.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 = SMCCC_VERSION_1_0;
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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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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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uint32_t
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smccc_get_version(void)
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{
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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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if (smccc_version == SMCCC_VERSION_1_0)
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return (PSCI_RETVAL_NOT_SUPPORTED);
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return (psci_call(SMCCC_ARCH_FEATURES, smccc_func_id, 0, 0));
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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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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 (psci_call(SMCCC_ARCH_WORKAROUND_1, 0, 0, 0));
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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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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 (psci_call(SMCCC_ARCH_WORKAROUND_2, enable, 0, 0));
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}
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