Port SMCCC code from Linux kernel. To accomodate that: - Introduce CONFIG_ARM_SMCCC, to allow enabling the code independent of CONFIG_ARM_SECURE_MONITOR - Bring <linux/arm-smccc.h> in - Add necessary constants to arch/arm/asm-offsets.c Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx> --- arch/arm/Kconfig | 4 + arch/arm/cpu/Makefile | 4 +- arch/arm/cpu/smccc-call_64.S | 52 +++++++++++ arch/arm/include/asm/asm-offsets.h | 1 + arch/arm/lib/asm-offsets.c | 7 +- include/linux/arm-smccc.h | 135 +++++++++++++++++++++++++++++ 6 files changed, 200 insertions(+), 3 deletions(-) create mode 100644 arch/arm/cpu/smccc-call_64.S create mode 100644 arch/arm/include/asm/asm-offsets.h create mode 100644 include/linux/arm-smccc.h diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 3555b4ee5..00c893bd0 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -388,7 +388,11 @@ config ARM_SEMIHOSTING the data on the host computer connected to the target via debugging channel (JTAG, SWD). If unsure say N +config ARM_SMCCC + bool + config ARM_SECURE_MONITOR + select ARM_SMCCC bool config ARM_PSCI diff --git a/arch/arm/cpu/Makefile b/arch/arm/cpu/Makefile index 5b4b832e8..874d723e2 100644 --- a/arch/arm/cpu/Makefile +++ b/arch/arm/cpu/Makefile @@ -21,8 +21,8 @@ obj-$(CONFIG_CPU_32v7) += no-mmu.o endif obj-$(CONFIG_ARM_PSCI) += psci.o -obj-$(CONFIG_ARM_SECURE_MONITOR) += smccc-call.o -AFLAGS_smccc-call.o :=-Wa,-march=armv7-a +obj-pbl-$(CONFIG_ARM_SMCCC) += smccc-call$(S64).o +AFLAGS_smccc-call$(S64).o :=-Wa,-march=armv$(if $(S64),8,7)-a obj-$(CONFIG_ARM_SECURE_MONITOR) += sm.o sm_as.o AFLAGS_sm_as.o :=-Wa,-march=armv7-a diff --git a/arch/arm/cpu/smccc-call_64.S b/arch/arm/cpu/smccc-call_64.S new file mode 100644 index 000000000..44888fb59 --- /dev/null +++ b/arch/arm/cpu/smccc-call_64.S @@ -0,0 +1,52 @@ +/* + * 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> +#include <linux/arm-smccc.h> +#include <asm/asm-offsets.h> + + .macro SMCCC instr + .cfi_startproc + \instr #0 + ldr x4, [sp] + stp x0, x1, [x4, #ARM_SMCCC_RES_X0_OFFS] + stp x2, x3, [x4, #ARM_SMCCC_RES_X2_OFFS] + ldr x4, [sp, #8] + cbz x4, 1f /* no quirk structure */ + ldr x9, [x4, #ARM_SMCCC_QUIRK_ID_OFFS] + cmp x9, #ARM_SMCCC_QUIRK_QCOM_A6 + b.ne 1f + str x6, [x4, ARM_SMCCC_QUIRK_STATE_OFFS] +1: ret + .cfi_endproc + .endm + +/* + * void arm_smccc_smc(unsigned long a0, unsigned long a1, unsigned long a2, + * unsigned long a3, unsigned long a4, unsigned long a5, + * unsigned long a6, unsigned long a7, struct arm_smccc_res *res, + * struct arm_smccc_quirk *quirk) + */ +ENTRY(__arm_smccc_smc) + SMCCC smc +ENDPROC(__arm_smccc_smc) + +/* + * void arm_smccc_hvc(unsigned long a0, unsigned long a1, unsigned long a2, + * unsigned long a3, unsigned long a4, unsigned long a5, + * unsigned long a6, unsigned long a7, struct arm_smccc_res *res, + * struct arm_smccc_quirk *quirk) + */ +ENTRY(__arm_smccc_hvc) + SMCCC hvc +ENDPROC(__arm_smccc_hvc) \ No newline at end of file diff --git a/arch/arm/include/asm/asm-offsets.h b/arch/arm/include/asm/asm-offsets.h new file mode 100644 index 000000000..2f84e8399 --- /dev/null +++ b/arch/arm/include/asm/asm-offsets.h @@ -0,0 +1 @@ +#include <generated/asm-offsets.h> \ No newline at end of file diff --git a/arch/arm/lib/asm-offsets.c b/arch/arm/lib/asm-offsets.c index 7bf6d129c..cdff6f782 100644 --- a/arch/arm/lib/asm-offsets.c +++ b/arch/arm/lib/asm-offsets.c @@ -9,8 +9,13 @@ */ #include <linux/kbuild.h> +#include <linux/arm-smccc.h> int main(void) { - return 0; + DEFINE(ARM_SMCCC_RES_X0_OFFS, offsetof(struct arm_smccc_res, a0)); + DEFINE(ARM_SMCCC_RES_X2_OFFS, offsetof(struct arm_smccc_res, a2)); + DEFINE(ARM_SMCCC_QUIRK_ID_OFFS, offsetof(struct arm_smccc_quirk, id)); + DEFINE(ARM_SMCCC_QUIRK_STATE_OFFS, offsetof(struct arm_smccc_quirk, state)); + return 0; } diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h new file mode 100644 index 000000000..1b38b7b37 --- /dev/null +++ b/include/linux/arm-smccc.h @@ -0,0 +1,135 @@ +/* + * 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 + +/* + * This file provides common defines for ARM SMC Calling Convention as + * specified in + * http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html + */ + +/* This constant is shifted by 31, make sure it's of an unsigned type */ +#define ARM_SMCCC_STD_CALL 0UL +#define ARM_SMCCC_FAST_CALL 1UL +#define ARM_SMCCC_TYPE_SHIFT 31 + +#define ARM_SMCCC_SMC_32 0 +#define ARM_SMCCC_SMC_64 1 +#define ARM_SMCCC_CALL_CONV_SHIFT 30 + +#define ARM_SMCCC_OWNER_MASK 0x3F +#define ARM_SMCCC_OWNER_SHIFT 24 + +#define ARM_SMCCC_FUNC_MASK 0xFFFF + +#define ARM_SMCCC_IS_FAST_CALL(smc_val) \ + ((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT)) +#define ARM_SMCCC_IS_64(smc_val) \ + ((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT)) +#define ARM_SMCCC_FUNC_NUM(smc_val) ((smc_val) & ARM_SMCCC_FUNC_MASK) +#define ARM_SMCCC_OWNER_NUM(smc_val) \ + (((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK) + +#define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \ + (((type) << ARM_SMCCC_TYPE_SHIFT) | \ + ((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \ + (((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \ + ((func_num) & ARM_SMCCC_FUNC_MASK)) + +#define ARM_SMCCC_OWNER_ARCH 0 +#define ARM_SMCCC_OWNER_CPU 1 +#define ARM_SMCCC_OWNER_SIP 2 +#define ARM_SMCCC_OWNER_OEM 3 +#define ARM_SMCCC_OWNER_STANDARD 4 +#define ARM_SMCCC_OWNER_TRUSTED_APP 48 +#define ARM_SMCCC_OWNER_TRUSTED_APP_END 49 +#define ARM_SMCCC_OWNER_TRUSTED_OS 50 +#define ARM_SMCCC_OWNER_TRUSTED_OS_END 63 + +#define ARM_SMCCC_QUIRK_NONE 0 +#define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */ + +#ifndef __ASSEMBLY__ + +#include <linux/linkage.h> +#include <linux/types.h> +/** + * struct arm_smccc_res - Result from SMC/HVC call + * @a0-a3 result values from registers 0 to 3 + */ +struct arm_smccc_res { + unsigned long a0; + unsigned long a1; + unsigned long a2; + unsigned long a3; +}; + +/** + * struct arm_smccc_quirk - Contains quirk information + * @id: quirk identification + * @state: quirk specific information + * @a6: Qualcomm quirk entry for returning post-smc call contents of a6 + */ +struct arm_smccc_quirk { + int id; + union { + unsigned long a6; + } state; +}; + +/** + * __arm_smccc_smc() - make SMC calls + * @a0-a7: arguments passed in registers 0 to 7 + * @res: result values from registers 0 to 3 + * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. + * + * This function is used to make SMC calls following SMC Calling Convention. + * The content of the supplied param are copied to registers 0 to 7 prior + * to the SMC instruction. The return values are updated with the content + * from register 0 to 3 on return from the SMC instruction. An optional + * quirk structure provides vendor specific behavior. + */ +asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1, + unsigned long a2, unsigned long a3, unsigned long a4, + unsigned long a5, unsigned long a6, unsigned long a7, + struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); + +/** + * __arm_smccc_hvc() - make HVC calls + * @a0-a7: arguments passed in registers 0 to 7 + * @res: result values from registers 0 to 3 + * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. + * + * This function is used to make HVC calls following SMC Calling + * Convention. The content of the supplied param are copied to registers 0 + * to 7 prior to the HVC instruction. The return values are updated with + * the content from register 0 to 3 on return from the HVC instruction. An + * optional quirk structure provides vendor specific behavior. + */ +asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1, + unsigned long a2, unsigned long a3, unsigned long a4, + unsigned long a5, unsigned long a6, unsigned long a7, + struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); + +#define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL) + +#define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__) + +#define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL) + +#define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__) + +#endif /*__ASSEMBLY__*/ +#endif /*__LINUX_ARM_SMCCC_H*/ -- 2.17.1 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox