From patchwork Wed Aug 19 08:40:25 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jens Wiklander X-Patchwork-Id: 7036191 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 7442EC05AC for ; Wed, 19 Aug 2015 08:43:24 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 24409206A0 for ; Wed, 19 Aug 2015 08:43:23 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D7E9220569 for ; Wed, 19 Aug 2015 08:43:21 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZRyw1-0001K5-Ii; Wed, 19 Aug 2015 08:41:25 +0000 Received: from mail-la0-f48.google.com ([209.85.215.48]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZRyvx-0001CF-Gx for linux-arm-kernel@lists.infradead.org; Wed, 19 Aug 2015 08:41:23 +0000 Received: by lalv9 with SMTP id v9so115034137lal.0 for ; Wed, 19 Aug 2015 01:40:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=XctsWVQmptXk7sOdqW+HFZ5eVtLw3KUy8dBZgQPjS+g=; b=cb/+SZUWWCL0XzjcFtdI3MlX4ySvDOdYGOPJjcqhwmdnDOspf9gFZrT9cK5XRX/i2m tfkQLi47rWOBRhvRXVOE7OOwW8hNEa7EIeNWGeV1H+Ae4e5qaDxjwovFzSvuwNz4YFKY DJEjl1VE4io3vGZcC1E6fiYFMJFW8xdst6EMivpSu+bVYp5F83XfNvaXJKrGY9iyU6yk JD0baujHNFjVJ5NdPazk7tdrg/gQS8hsVZYTgcJjKxbt/ClQIRDc+cdA1FCp+RH3ZNMJ UOVRlLbRNz6m3qpgy7hlHQaz/JcE42Q2YQwQRBjpKFDQGKGhENfV7ltzXRAkP+AjbbRE JmYA== X-Gm-Message-State: ALoCoQlYtMO2ZCAHys+tiDbe9yzhCRu31Z+P2m8TFcAQfWim0p5boalYKCiGLpKZL8LvAtD8fgIW X-Received: by 10.152.20.228 with SMTP id q4mr10008456lae.74.1439973658094; Wed, 19 Aug 2015 01:40:58 -0700 (PDT) Received: from localhost.localdomain ([85.235.11.236]) by smtp.gmail.com with ESMTPSA id g5sm5680487laf.33.2015.08.19.01.40.55 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 19 Aug 2015 01:40:56 -0700 (PDT) From: Jens Wiklander To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Arnd Bergmann , Greg Kroah-Hartman , Kees Cook Subject: [PATCH v5 1/5] arm/arm64: add smccc ARCH32 Date: Wed, 19 Aug 2015 10:40:25 +0200 Message-Id: <1439973629-19505-2-git-send-email-jens.wiklander@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1439973629-19505-1-git-send-email-jens.wiklander@linaro.org> References: <1439973629-19505-1-git-send-email-jens.wiklander@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150819_014121_954278_B1D4C168 X-CRM114-Status: GOOD ( 21.77 ) X-Spam-Score: -2.6 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: valentin.manea@huawei.com, Mark Rutland , javier@javigon.com, emmanuel.michel@st.com, Michal Simek , jean-michel.delorme@st.com, Jason Gunthorpe , Rob Herring , Jens Wiklander MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.8 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Adds helpers to do SMC based on ARM SMC Calling Convention. CONFIG_HAVE_SMCCC is enabled for architectures that may support the SMC instruction. It's the responsibility of the caller to know if the SMC instruction is supported by the platform. Signed-off-by: Jens Wiklander --- arch/arm/Kconfig | 4 +++ arch/arm/kernel/Makefile | 2 ++ arch/arm/kernel/smccc-call.S | 26 ++++++++++++++ arch/arm/kernel/smccc.c | 17 +++++++++ arch/arm64/Kconfig | 4 +++ arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/smccc-call.S | 34 ++++++++++++++++++ arch/arm64/kernel/smccc.c | 17 +++++++++ include/linux/arm-smccc.h | 79 ++++++++++++++++++++++++++++++++++++++++++ 9 files changed, 184 insertions(+) create mode 100644 arch/arm/kernel/smccc-call.S create mode 100644 arch/arm/kernel/smccc.c create mode 100644 arch/arm64/kernel/smccc-call.S create mode 100644 arch/arm64/kernel/smccc.c create mode 100644 include/linux/arm-smccc.h diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 45df48b..75e4da3 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -221,6 +221,9 @@ config NEED_RET_TO_USER config ARCH_MTD_XIP bool +config HAVE_SMCCC + bool + config VECTORS_BASE hex default 0xffff0000 if MMU || CPU_HIGH_VECTOR @@ -324,6 +327,7 @@ config ARCH_MULTIPLATFORM select CLKSRC_OF select COMMON_CLK select GENERIC_CLOCKEVENTS + select HAVE_SMCCC if CPU_V7 select MIGHT_HAVE_PCI select MULTI_IRQ_HANDLER select SPARSE_IRQ diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 752725d..8cdd25b 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -90,4 +90,6 @@ obj-y += psci.o psci-call.o obj-$(CONFIG_SMP) += psci_smp.o endif +obj-$(CONFIG_HAVE_SMCCC) += smccc-call.o smccc.o + extra-y := $(head-y) vmlinux.lds diff --git a/arch/arm/kernel/smccc-call.S b/arch/arm/kernel/smccc-call.S new file mode 100644 index 0000000..05bc554 --- /dev/null +++ b/arch/arm/kernel/smccc-call.S @@ -0,0 +1,26 @@ +/* + * Copyright (c) 2015, Linaro Limited + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +#include + +#include + +/* void smccc_call32(struct smccc_param32 *param) */ +ENTRY(smccc_call32) + push {r4-r8, lr} + mov r8, r0 + ldm r8, {r0-r7} + __SMC(0) + stm r8, {r0-r7} + pop {r4-r8, pc} +ENDPROC(smccc_call32) diff --git a/arch/arm/kernel/smccc.c b/arch/arm/kernel/smccc.c new file mode 100644 index 0000000..ba4039e --- /dev/null +++ b/arch/arm/kernel/smccc.c @@ -0,0 +1,17 @@ +/* + * Copyright (c) 2015, Linaro Limited + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +#include +#include + +EXPORT_SYMBOL_GPL(smccc_call32); diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 7796af4..b3ea778 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -83,6 +83,7 @@ config ARM64 select SPARSE_IRQ select SYSCTL_EXCEPTION_TRACE select HAVE_CONTEXT_TRACKING + select HAVE_SMCCC help ARM 64-bit (AArch64) Linux support. @@ -146,6 +147,9 @@ config KERNEL_MODE_NEON config FIX_EARLYCON_MEM def_bool y +config HAVE_SMCCC + bool + config PGTABLE_LEVELS int default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42 diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index 426d076..f7804f7 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -36,6 +36,7 @@ arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o arm64-obj-$(CONFIG_PCI) += pci.o arm64-obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o arm64-obj-$(CONFIG_ACPI) += acpi.o +arm64-obj-$(CONFIG_HAVE_SMCCC) += smccc-call.o smccc.o obj-y += $(arm64-obj-y) vdso/ obj-m += $(arm64-obj-m) diff --git a/arch/arm64/kernel/smccc-call.S b/arch/arm64/kernel/smccc-call.S new file mode 100644 index 0000000..3ce7fe8 --- /dev/null +++ b/arch/arm64/kernel/smccc-call.S @@ -0,0 +1,34 @@ +/* + * Copyright (c) 2015, Linaro Limited + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License Version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +#include + +#define SMC_PARAM_W0_OFFS 0 +#define SMC_PARAM_W2_OFFS 8 +#define SMC_PARAM_W4_OFFS 16 +#define SMC_PARAM_W6_OFFS 24 + +/* void smccc_call32(struct smccc_param32 *param) */ +ENTRY(smccc_call32) + stp x28, x30, [sp, #-16]! + mov x28, x0 + ldp w0, w1, [x28, #SMC_PARAM_W0_OFFS] + ldp w2, w3, [x28, #SMC_PARAM_W2_OFFS] + ldp w4, w5, [x28, #SMC_PARAM_W4_OFFS] + ldp w6, w7, [x28, #SMC_PARAM_W6_OFFS] + smc #0 + stp w0, w1, [x28, #SMC_PARAM_W0_OFFS] + stp w2, w3, [x28, #SMC_PARAM_W2_OFFS] + ldp x28, x30, [sp], #16 + ret +ENDPROC(smccc_call32) diff --git a/arch/arm64/kernel/smccc.c b/arch/arm64/kernel/smccc.c new file mode 100644 index 0000000..ba4039e --- /dev/null +++ b/arch/arm64/kernel/smccc.c @@ -0,0 +1,17 @@ +/* + * Copyright (c) 2015, Linaro Limited + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +#include +#include + +EXPORT_SYMBOL_GPL(smccc_call32); diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h new file mode 100644 index 0000000..9b8d775 --- /dev/null +++ b/include/linux/arm-smccc.h @@ -0,0 +1,79 @@ +/* + * Copyright (c) 2015, Linaro Limited + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +#ifndef __LINUX_ARM_SMCCC_H +#define __LINUX_ARM_SMCCC_H + +#include + +/* + * This file provideds defines common defines for ARM SMC Calling + * Convention as specified in + * http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html + */ + +#define SMCCC_SMC_32 (0 << 30) +#define SMCCC_SMC_64 (1 << 30) +#define SMCCC_FAST_CALL (1 << 31) +#define SMCCC_STD_CALL (0 << 31) + +#define SMCCC_OWNER_MASK 0x3F +#define SMCCC_OWNER_SHIFT 24 + +#define SMCCC_FUNC_MASK 0xFFFF + +#define SMCCC_IS_FAST_CALL(smc_val) ((smc_val) & SMCCC_FAST_CALL) +#define SMCCC_IS_64(smc_val) ((smc_val) & SMCCC_SMC_64) +#define SMCCC_FUNC_NUM(smc_val) ((smc_val) & SMCCC_FUNC_MASK) +#define SMCCC_OWNER_NUM(smc_val) \ + (((smc_val) >> SMCCC_OWNER_SHIFT) & SMCCC_OWNER_MASK) + +#define SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \ + ((type) | (calling_convention) | \ + (((owner) & SMCCC_OWNER_MASK) << SMCCC_OWNER_SHIFT) | \ + ((func_num) & SMCCC_FUNC_MASK)) + +#define SMCCC_OWNER_ARCH 0 +#define SMCCC_OWNER_CPU 1 +#define SMCCC_OWNER_SIP 2 +#define SMCCC_OWNER_OEM 3 +#define SMCCC_OWNER_STANDARD 4 +#define SMCCC_OWNER_TRUSTED_APP 48 +#define SMCCC_OWNER_TRUSTED_APP_END 49 +#define SMCCC_OWNER_TRUSTED_OS 50 +#define SMCCC_OWNER_TRUSTED_OS_END 63 + +struct smccc_param32 { + u32 a0; + u32 a1; + u32 a2; + u32 a3; + u32 a4; + u32 a5; + u32 a6; + u32 a7; +}; + +/** + * smccc_call32() - make ARCH32 SMC calls + * @param: values to pass in registers 0 to 7 + * + * This function is used to make SMC calls following SMC Calling Convention + * for ARCH32 calls. The content of the supplied param are copied to + * registers 0 to 7 prior to the SMC instruction. Values a0..a3 are updated + * with the content from register 0 to 3 on return from the SMC + * instruction. + */ +void smccc_call32(struct smccc_param32 *param); + +#endif /*__LINUX_ARM_SMCCC_H*/