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