Module Name: src Committed By: jmcneill Date: Fri Aug 6 19:38:54 UTC 2021
Modified Files: src/sys/arch/aarch64/conf: files.aarch64 src/sys/arch/arm/acpi: acpi_platform.c src/sys/arch/arm/arm: psci.c psci.h src/sys/arch/arm/conf: files.arm src/sys/arch/arm/fdt: psci_fdt.c Added Files: src/sys/arch/arm/arm: smccc.c smccc.h Log Message: Arm: Add support for SMC Calling Convention Arm DEN0028 defines a calling mechanism used with Secure Monitor Call (SMC) and Hypervisor Call (HVC) instructions. To discover SMCCC, we must: 1) Find the PSCI conduit (either via ACPI FADT, or Device Tree) 2) Use PSCI_VERSION to determine whether PSCI_FEATURES is supported 3) Call PSCI_FEATURES with SMCCC_VERSION to determine the implementation version. To generate a diff of this commit: cvs rdiff -u -r1.31 -r1.32 src/sys/arch/aarch64/conf/files.aarch64 cvs rdiff -u -r1.26 -r1.27 src/sys/arch/arm/acpi/acpi_platform.c cvs rdiff -u -r1.5 -r1.6 src/sys/arch/arm/arm/psci.c cvs rdiff -u -r1.2 -r1.3 src/sys/arch/arm/arm/psci.h cvs rdiff -u -r0 -r1.1 src/sys/arch/arm/arm/smccc.c \ src/sys/arch/arm/arm/smccc.h cvs rdiff -u -r1.164 -r1.165 src/sys/arch/arm/conf/files.arm cvs rdiff -u -r1.20 -r1.21 src/sys/arch/arm/fdt/psci_fdt.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.
Modified files: Index: src/sys/arch/aarch64/conf/files.aarch64 diff -u src/sys/arch/aarch64/conf/files.aarch64:1.31 src/sys/arch/aarch64/conf/files.aarch64:1.32 --- src/sys/arch/aarch64/conf/files.aarch64:1.31 Sat Jul 24 23:38:41 2021 +++ src/sys/arch/aarch64/conf/files.aarch64 Fri Aug 6 19:38:53 2021 @@ -1,4 +1,4 @@ -# $NetBSD: files.aarch64,v 1.31 2021/07/24 23:38:41 jmcneill Exp $ +# $NetBSD: files.aarch64,v 1.32 2021/08/06 19:38:53 jmcneill Exp $ defflag opt_cpuoptions.h AARCH64_ALIGNMENT_CHECK defflag opt_cpuoptions.h AARCH64_EL0_STACK_ALIGNMENT_CHECK @@ -33,11 +33,15 @@ defparam opt_console.h CONSPEED defparam opt_console.h CONMODE defparam opt_console.h CONADDR -# Power State Coordination Interface (PSCI) # FP support file arch/aarch64/aarch64/fpu.c -device psci +# SMC Calling Convention +define smccc +file arch/arm/arm/smccc.c smccc + +# Power State Coordination Interface (PSCI) +device psci: smccc file arch/arm/arm/psci.c psci file arch/arm/arm/psci_arm.S psci Index: src/sys/arch/arm/acpi/acpi_platform.c diff -u src/sys/arch/arm/acpi/acpi_platform.c:1.26 src/sys/arch/arm/acpi/acpi_platform.c:1.27 --- src/sys/arch/arm/acpi/acpi_platform.c:1.26 Wed May 12 23:22:32 2021 +++ src/sys/arch/arm/acpi/acpi_platform.c Fri Aug 6 19:38:53 2021 @@ -1,4 +1,4 @@ -/* $NetBSD: acpi_platform.c,v 1.26 2021/05/12 23:22:32 thorpej Exp $ */ +/* $NetBSD: acpi_platform.c,v 1.27 2021/08/06 19:38:53 jmcneill Exp $ */ /*- * Copyright (c) 2018 The NetBSD Foundation, Inc. @@ -35,7 +35,7 @@ #include "opt_multiprocessor.h" #include <sys/cdefs.h> -__KERNEL_RCSID(0, "$NetBSD: acpi_platform.c,v 1.26 2021/05/12 23:22:32 thorpej Exp $"); +__KERNEL_RCSID(0, "$NetBSD: acpi_platform.c,v 1.27 2021/08/06 19:38:53 jmcneill Exp $"); #include <sys/param.h> #include <sys/bus.h> @@ -55,6 +55,7 @@ __KERNEL_RCSID(0, "$NetBSD: acpi_platfor #include <arm/cortex/gtmr_var.h> +#include <arm/arm/smccc.h> #include <arm/arm/psci.h> #include <arm/fdt/psci_fdtvar.h> Index: src/sys/arch/arm/arm/psci.c diff -u src/sys/arch/arm/arm/psci.c:1.5 src/sys/arch/arm/arm/psci.c:1.6 --- src/sys/arch/arm/arm/psci.c:1.5 Sat Jan 16 23:51:50 2021 +++ src/sys/arch/arm/arm/psci.c Fri Aug 6 19:38:53 2021 @@ -1,4 +1,4 @@ -/* $NetBSD: psci.c,v 1.5 2021/01/16 23:51:50 chs Exp $ */ +/* $NetBSD: psci.c,v 1.6 2021/08/06 19:38:53 jmcneill Exp $ */ /*- * Copyright (c) 2017 Jared McNeill <jmcne...@invisible.ca> @@ -27,7 +27,7 @@ */ #include <sys/cdefs.h> -__KERNEL_RCSID(0, "$NetBSD: psci.c,v 1.5 2021/01/16 23:51:50 chs Exp $"); +__KERNEL_RCSID(0, "$NetBSD: psci.c,v 1.6 2021/08/06 19:38:53 jmcneill Exp $"); #include <sys/param.h> #include <sys/bus.h> @@ -45,6 +45,7 @@ __KERNEL_RCSID(0, "$NetBSD: psci.c,v 1.5 #else #define PSCI_CPU_ON 0x84000003 #endif +#define PSCI_FEATURES 0x8400000a static psci_fn psci_call_fn; @@ -53,9 +54,10 @@ static uint32_t psci_functions[PSCI_FUNC [PSCI_FUNC_SYSTEM_OFF] = PSCI_SYSTEM_OFF, [PSCI_FUNC_SYSTEM_RESET] = PSCI_SYSTEM_RESET, [PSCI_FUNC_CPU_ON] = PSCI_CPU_ON, + [PSCI_FUNC_FEATURES] = PSCI_FEATURES, }; -static int +int psci_call(register_t fid, register_t arg1, register_t arg2, register_t arg3) { KASSERT(psci_call_fn != NULL); @@ -98,6 +100,15 @@ psci_system_reset(void) psci_call(psci_functions[PSCI_FUNC_SYSTEM_RESET], 0, 0, 0); } +int +psci_features(uint32_t fid) +{ + if (psci_functions[PSCI_FUNC_FEATURES] == 0) { + return PSCI_NOT_SUPPORTED; + } + return psci_call(psci_functions[PSCI_FUNC_FEATURES], fid, 0, 0); +} + void psci_init(psci_fn fn) { Index: src/sys/arch/arm/arm/psci.h diff -u src/sys/arch/arm/arm/psci.h:1.2 src/sys/arch/arm/arm/psci.h:1.3 --- src/sys/arch/arm/arm/psci.h:1.2 Sat Oct 13 00:07:55 2018 +++ src/sys/arch/arm/arm/psci.h Fri Aug 6 19:38:53 2021 @@ -1,4 +1,4 @@ -/* $NetBSD: psci.h,v 1.2 2018/10/13 00:07:55 jmcneill Exp $ */ +/* $NetBSD: psci.h,v 1.3 2021/08/06 19:38:53 jmcneill Exp $ */ /*- * Copyright (c) 2017 Jared McNeill <jmcne...@invisible.ca> @@ -37,6 +37,7 @@ enum psci_function { PSCI_FUNC_CPU_ON, PSCI_FUNC_SYSTEM_OFF, PSCI_FUNC_SYSTEM_RESET, + PSCI_FUNC_FEATURES, PSCI_FUNC_MAX }; @@ -108,4 +109,13 @@ void psci_system_off(void); */ void psci_system_reset(void); +/* + * Discover supported features. + */ +int psci_features(uint32_t); + +/* + * Generic PSCI call. + */ +int psci_call(register_t, register_t, register_t, register_t); #endif /* _ARM_PSCI_H */ Index: src/sys/arch/arm/conf/files.arm diff -u src/sys/arch/arm/conf/files.arm:1.164 src/sys/arch/arm/conf/files.arm:1.165 --- src/sys/arch/arm/conf/files.arm:1.164 Wed Oct 21 13:31:51 2020 +++ src/sys/arch/arm/conf/files.arm Fri Aug 6 19:38:53 2021 @@ -1,4 +1,4 @@ -# $NetBSD: files.arm,v 1.164 2020/10/21 13:31:51 christos Exp $ +# $NetBSD: files.arm,v 1.165 2021/08/06 19:38:53 jmcneill Exp $ # temporary define to allow easy moving to ../arch/arm/arm32 defflag ARM32 @@ -99,8 +99,12 @@ obsolete defflag ARMFPE file arch/arm/vfp/vfp_init.c arm32 #file arch/arm/vfp/pmap_vfp.S arm32 & fpu_vfp +# SMC Calling Convention +define smccc +file arch/arm/arm/smccc.c smccc + # Power State Coordination Interface (PSCI) -device psci +device psci: smccc file arch/arm/arm/psci.c psci file arch/arm/arm/psci_arm.S psci Index: src/sys/arch/arm/fdt/psci_fdt.c diff -u src/sys/arch/arm/fdt/psci_fdt.c:1.20 src/sys/arch/arm/fdt/psci_fdt.c:1.21 --- src/sys/arch/arm/fdt/psci_fdt.c:1.20 Wed Jan 27 03:10:19 2021 +++ src/sys/arch/arm/fdt/psci_fdt.c Fri Aug 6 19:38:53 2021 @@ -1,4 +1,4 @@ -/* $NetBSD: psci_fdt.c,v 1.20 2021/01/27 03:10:19 thorpej Exp $ */ +/* $NetBSD: psci_fdt.c,v 1.21 2021/08/06 19:38:53 jmcneill Exp $ */ /*- * Copyright (c) 2017 Jared McNeill <jmcne...@invisible.ca> @@ -29,7 +29,7 @@ #include "opt_multiprocessor.h" #include <sys/cdefs.h> -__KERNEL_RCSID(0, "$NetBSD: psci_fdt.c,v 1.20 2021/01/27 03:10:19 thorpej Exp $"); +__KERNEL_RCSID(0, "$NetBSD: psci_fdt.c,v 1.21 2021/08/06 19:38:53 jmcneill Exp $"); #include <sys/param.h> #include <sys/atomic.h> @@ -40,6 +40,7 @@ __KERNEL_RCSID(0, "$NetBSD: psci_fdt.c,v #include <dev/fdt/fdtvar.h> +#include <arm/arm/smccc.h> #include <arm/arm/psci.h> #include <arm/fdt/psci_fdtvar.h> @@ -135,6 +136,8 @@ psci_fdt_init(const int phandle) psci_setfunc(PSCI_FUNC_CPU_ON, val); } + smccc_probe(); + return 0; } Added files: Index: src/sys/arch/arm/arm/smccc.c diff -u /dev/null src/sys/arch/arm/arm/smccc.c:1.1 --- /dev/null Fri Aug 6 19:38:54 2021 +++ src/sys/arch/arm/arm/smccc.c Fri Aug 6 19:38:53 2021 @@ -0,0 +1,89 @@ +/* $NetBSD: smccc.c,v 1.1 2021/08/06 19:38:53 jmcneill Exp $ */ + +/*- + * Copyright (c) 2021 Jared McNeill <jmcne...@invisible.ca> + * All rights reserved. + * + * 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 ``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 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 <sys/cdefs.h> +__KERNEL_RCSID(0, "$NetBSD: smccc.c,v 1.1 2021/08/06 19:38:53 jmcneill Exp $"); + +#include <sys/param.h> +#include <sys/kernel.h> + +#include <arm/arm/psci.h> +#include <arm/arm/smccc.h> + +/* Minimum supported PSCI version for SMCCC discovery */ +#define PSCI_VERSION_1_0 0x10000 + +/* Retrieve the implemented version of the SMC Calling Convention. */ +#define SMCCC_VERSION 0x80000000 + +/* True if SMCCC is detected. */ +static bool smccc_present; + +/* + * smccc_probe -- + * + * Returns true if SMCCC is supported by platform firmware. + */ +bool +smccc_probe(void) +{ + if (cold && !smccc_present) { + if (!psci_available() || psci_version() < PSCI_VERSION_1_0) { + return false; + } + + smccc_present = psci_features(SMCCC_VERSION) == PSCI_SUCCESS; + } + return smccc_present; +} + +/* + * smccc_version -- + * + * Return the implemented SMCCC version, or a negative error code on failure. + */ +int +smccc_version(void) +{ + return smccc_call(SMCCC_VERSION, 0, 0, 0); +} + +/* + * smccc_call -- + * + * Generic call interface for SMC/HVC calls. + */ +int +smccc_call(register_t fid, register_t arg1, register_t arg2, register_t arg3) +{ + if (!smccc_present) { + return SMCCC_NOT_SUPPORTED; + } + + return psci_call(fid, arg1, arg2, arg3); +} Index: src/sys/arch/arm/arm/smccc.h diff -u /dev/null src/sys/arch/arm/arm/smccc.h:1.1 --- /dev/null Fri Aug 6 19:38:54 2021 +++ src/sys/arch/arm/arm/smccc.h Fri Aug 6 19:38:53 2021 @@ -0,0 +1,55 @@ +/* $NetBSD: smccc.h,v 1.1 2021/08/06 19:38:53 jmcneill Exp $ */ + +/*- + * Copyright (c) 2021 Jared McNeill <jmcne...@invisible.ca> + * All rights reserved. + * + * 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 ``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 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. + */ + +#ifndef _ARM_SMCCC_H +#define _ARM_SMCCC_H + +/* + * SMCCC return codes + */ +#define SMCCC_SUCCESS 0 +#define SMCCC_NOT_SUPPORTED -1 +#define SMCCC_NOT_REQUIRED -2 +#define SMCCC_INVALID_PARAMETER -3 + +/* + * Returns true if SMCCC is supported. + */ +bool smccc_probe(void); + +/* + * Get SMCCC version. + */ +int smccc_version(void); + +/* + * Call an SMC/HVC service. + */ +int smccc_call(register_t, register_t, register_t, register_t); + +#endif /* _ARM_SMCCC_H */