Date: Wed, 13 Jun 2018 15:32:00 +0000 (UTC) From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r335062 - in head/sys: conf dev/psci Message-ID: <201806131532.w5DFW0oN098397@repo.freebsd.org>
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Author: andrew Date: Wed Jun 13 15:32:00 2018 New Revision: 335062 URL: https://svnweb.freebsd.org/changeset/base/335062 Log: 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 Added: head/sys/dev/psci/smccc.c (contents, props changed) head/sys/dev/psci/smccc.h (contents, props changed) Modified: head/sys/conf/files.arm64 Modified: head/sys/conf/files.arm64 ============================================================================== --- head/sys/conf/files.arm64 Wed Jun 13 15:24:07 2018 (r335061) +++ head/sys/conf/files.arm64 Wed Jun 13 15:32:00 2018 (r335062) @@ -208,6 +208,7 @@ dev/pci/pci_host_generic_acpi.c optional pci acpi dev/pci/pci_host_generic_fdt.c optional pci fdt dev/psci/psci.c standard dev/psci/psci_arm64.S standard +dev/psci/smccc.c standard dev/uart/uart_cpu_arm64.c optional uart dev/uart/uart_dev_mu.c optional uart uart_mu dev/uart/uart_dev_pl011.c optional uart pl011 Added: head/sys/dev/psci/smccc.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/dev/psci/smccc.c Wed Jun 13 15:32:00 2018 (r335062) @@ -0,0 +1,93 @@ +/*- + * 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)); +} Added: head/sys/dev/psci/smccc.h ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/dev/psci/smccc.h Wed Jun 13 15:32:00 2018 (r335062) @@ -0,0 +1,63 @@ +/*- + * 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 + +#define SMCCC_VERSION \ + SMCCC_FUNC_ID(SMCCC_FAST_CALL, SMCCC_64BIT_CALL, 0, 0) +#define SMCCC_ARCH_FEATURES \ + SMCCC_FUNC_ID(SMCCC_FAST_CALL, SMCCC_64BIT_CALL, 0, 1) +#define SMCCC_ARCH_WORKAROUND_1 \ + SMCCC_FUNC_ID(SMCCC_FAST_CALL, SMCCC_64BIT_CALL, 0, 0x8000) + +int32_t smccc_arch_features(uint32_t); +int smccc_arch_workaround_1(void); + + +#endif /* _PSCI_SMCCC_H_ */
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