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 jens.wiklander@linaro.org --- 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 | 80 ++++++++++++++++++++++++++++++++++++++++++ 9 files changed, 185 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 <linux/linkage.h> + +#include <asm/opcodes-sec.h> + +/* 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 <linux/export.h> +#include <linux/arm-smccc.h> + +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 <linux/linkage.h> + +#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 <linux/export.h> +#include <linux/arm-smccc.h> + +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..98b3c3c --- /dev/null +++ b/include/linux/arm-smccc.h @@ -0,0 +1,80 @@ +/* + * 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 <linux/types.h> + +/* + * 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*/ +