f651b52527
to call into the firmware in a similar way to the existing PSCI, and used PSCI to detect when SMCCC is enabled. There is a function ID space we can use. Currently we only support 3 functions in the ARM Architecture Calls region, however it is expected we will expend these in the future. Sponsored by: DARPA, AFRL
94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/*-
|
|
* 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/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.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 = SMCCC_VERSION_1_0;
|
|
|
|
static void
|
|
smccc_init(void *dummy)
|
|
{
|
|
int32_t features;
|
|
uint32_t ret;
|
|
|
|
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));
|
|
}
|
|
}
|
|
SYSINIT(smccc_start, SI_SUB_DRIVERS, SI_ORDER_ANY, smccc_init, NULL);
|
|
|
|
int32_t
|
|
smccc_arch_features(uint32_t smccc_func_id)
|
|
{
|
|
|
|
if (smccc_version == SMCCC_VERSION_1_0)
|
|
return (PSCI_RETVAL_NOT_SUPPORTED);
|
|
|
|
return (psci_call(SMCCC_ARCH_FEATURES, smccc_func_id, 0, 0));
|
|
}
|
|
|
|
/*
|
|
* The SMCCC handler for Spectre variant 2: Branch target injection.
|
|
* (CVE-2017-5715)
|
|
*/
|
|
int
|
|
smccc_arch_workaround_1(void)
|
|
{
|
|
|
|
KASSERT(smccc_version != SMCCC_VERSION_1_0,
|
|
("SMCCC arch workaround 1 called with an invalid SMCCC interface"));
|
|
return (psci_call(SMCCC_ARCH_WORKAROUND_1, 0, 0, 0));
|
|
}
|