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freebsd-dev/sys/dev/psci/smccc.h

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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
2018-06-13 15:32:00 +00:00
/*-
* 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.
*
* $FreeBSD$
*/
#ifndef _PSCI_SMCCC_H_
#define _PSCI_SMCCC_H_
#define SMCCC_VERSION_MAJOR(ver) (((ver) >> 16) & 0x7fff)
#define SMCCC_VERSION_MINOR(ver) ((ver) & 0xffff)
#define SMCCC_FUNC_ID(type, call_conv, range, func) \
(((type) << 31) | \
((call_conv) << 30) | \
(((range) & 0x3f) << 24) | \
((func) & 0xffff))
#define SMCCC_YIELDING_CALL 0
#define SMCCC_FAST_CALL 1
#define SMCCC_32BIT_CALL 0
#define SMCCC_64BIT_CALL 1
Add the SMCCC return codes from ARM DEN 0070A. While here add a comment with the document the function IDs come from. Sponsored by: DARPA, AFRL
2018-06-13 15:41:22 +00:00
/*
* Arm Architecture Calls.
* These are documented in the document ARM DEN 0070A.
*/
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
2018-06-13 15:32:00 +00:00
#define SMCCC_VERSION \
Fix the SMCCC signatures, they are all 32-bit calls. This fixes SMCCC version detection. Sponsored by: DARPA, AFRL
2018-06-20 10:02:50 +00:00
SMCCC_FUNC_ID(SMCCC_FAST_CALL, SMCCC_32BIT_CALL, 0, 0)
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
2018-06-13 15:32:00 +00:00
#define SMCCC_ARCH_FEATURES \
Fix the SMCCC signatures, they are all 32-bit calls. This fixes SMCCC version detection. Sponsored by: DARPA, AFRL
2018-06-20 10:02:50 +00:00
SMCCC_FUNC_ID(SMCCC_FAST_CALL, SMCCC_32BIT_CALL, 0, 1)
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
2018-06-13 15:32:00 +00:00
#define SMCCC_ARCH_WORKAROUND_1 \
Fix the SMCCC signatures, they are all 32-bit calls. This fixes SMCCC version detection. Sponsored by: DARPA, AFRL
2018-06-20 10:02:50 +00:00
SMCCC_FUNC_ID(SMCCC_FAST_CALL, SMCCC_32BIT_CALL, 0, 0x8000)
Implement the SSBD (CVE-2018-3639) workaround on arm64 This calls into the Arm Trusted Firmware to enable and disable the workaround for the Speculative Store Bypass Disable (SSBD) issue, also known as Spectre Variant 4. As this may have a large performance overhead, and how exploitable SSBD is is unknown we follow the Linux lead of allowing the administrator to select between always on, always off, or only enabled in the kernel, with the latter being the default. PR: 228955 Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D15819
2018-07-31 12:53:27 +00:00
#define SMCCC_ARCH_WORKAROUND_2 \
SMCCC_FUNC_ID(SMCCC_FAST_CALL, SMCCC_32BIT_CALL, 0, 0x7fff)
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
2018-06-13 15:32:00 +00:00
Add the SMCCC return codes from ARM DEN 0070A. While here add a comment with the document the function IDs come from. Sponsored by: DARPA, AFRL
2018-06-13 15:41:22 +00:00
/* The return values from ARM DEN 0070A. */
#define SMCCC_RET_SUCCESS 0
#define SMCCC_RET_NOT_SUPPORTED -1
#define SMCCC_RET_NOT_REQUIRED -2
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
2018-06-13 15:32:00 +00:00
int32_t smccc_arch_features(uint32_t);
int smccc_arch_workaround_1(void);
Implement the SSBD (CVE-2018-3639) workaround on arm64 This calls into the Arm Trusted Firmware to enable and disable the workaround for the Speculative Store Bypass Disable (SSBD) issue, also known as Spectre Variant 4. As this may have a large performance overhead, and how exploitable SSBD is is unknown we follow the Linux lead of allowing the administrator to select between always on, always off, or only enabled in the kernel, with the latter being the default. PR: 228955 Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D15819
2018-07-31 12:53:27 +00:00
int smccc_arch_workaround_2(bool);
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
2018-06-13 15:32:00 +00:00
#endif /* _PSCI_SMCCC_H_ */
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