Add support for the ARM SMC Calling Convention (SMCCC). This is a method
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
This commit is contained in:
andrew
parent
8e142f8279
commit
a1b985eba9
@ -208,6 +208,7 @@ dev/pci/pci_host_generic_acpi.c optional pci acpi
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dev/pci/pci_host_generic_fdt.c optional pci fdt
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dev/psci/psci.c standard
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dev/psci/psci_arm64.S standard
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dev/psci/smccc.c standard
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dev/uart/uart_cpu_arm64.c optional uart
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dev/uart/uart_dev_mu.c optional uart uart_mu
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dev/uart/uart_dev_pl011.c optional uart pl011
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93
sys/dev/psci/smccc.c
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93
sys/dev/psci/smccc.c
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@ -0,0 +1,93 @@
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/*-
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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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static void
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smccc_init(void *dummy)
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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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SYSINIT(smccc_start, SI_SUB_DRIVERS, SI_ORDER_ANY, smccc_init, NULL);
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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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63
sys/dev/psci/smccc.h
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63
sys/dev/psci/smccc.h
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@ -0,0 +1,63 @@
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/*-
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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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* $FreeBSD$
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*/
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#ifndef _PSCI_SMCCC_H_
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#define _PSCI_SMCCC_H_
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#define SMCCC_VERSION_MAJOR(ver) (((ver) >> 16) & 0x7fff)
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#define SMCCC_VERSION_MINOR(ver) ((ver) & 0xffff)
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#define SMCCC_FUNC_ID(type, call_conv, range, func) \
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(((type) << 31) | \
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((call_conv) << 30) | \
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(((range) & 0x3f) << 24) | \
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((func) & 0xffff))
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#define SMCCC_YIELDING_CALL 0
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#define SMCCC_FAST_CALL 1
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#define SMCCC_32BIT_CALL 0
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#define SMCCC_64BIT_CALL 1
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#define SMCCC_VERSION \
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SMCCC_FUNC_ID(SMCCC_FAST_CALL, SMCCC_64BIT_CALL, 0, 0)
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#define SMCCC_ARCH_FEATURES \
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SMCCC_FUNC_ID(SMCCC_FAST_CALL, SMCCC_64BIT_CALL, 0, 1)
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#define SMCCC_ARCH_WORKAROUND_1 \
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SMCCC_FUNC_ID(SMCCC_FAST_CALL, SMCCC_64BIT_CALL, 0, 0x8000)
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int32_t smccc_arch_features(uint32_t);
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int smccc_arch_workaround_1(void);
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#endif /* _PSCI_SMCCC_H_ */
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