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arm-smccc.h
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/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (c) 2015, Linaro Limited */ #ifndef __LINUX_ARM_SMCCC_H #define __LINUX_ARM_SMCCC_H #include <uapi/linux/const.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 */ #define ARM_SMCCC_STD_CALL _AC(0,U) #define ARM_SMCCC_FAST_CALL _AC(1,U) #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 */ #define ARM_SMCCC_VERSION_1_0 0x10000 #define ARM_SMCCC_VERSION_1_1 0x10001 #define ARM_SMCCC_VERSION_FUNC_ID \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ 0, 0) #define ARM_SMCCC_ARCH_FEATURES_FUNC_ID \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ 0, 1) #define ARM_SMCCC_ARCH_WORKAROUND_1 \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ 0, 0x8000) #define ARM_SMCCC_ARCH_WORKAROUND_2 \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ 0, 0x7fff) #define ARM_SMCCC_ARCH_WORKAROUND_3 \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ 0, 0x3fff) #define SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED 1 #ifndef __ASSEMBLY__ #include <linux/linkage.h> #include <linux/types.h> enum arm_smccc_conduit { SMCCC_CONDUIT_NONE, SMCCC_CONDUIT_SMC, SMCCC_CONDUIT_HVC, }; /** * arm_smccc_1_1_get_conduit() * * Returns the conduit to be used for SMCCCv1.1 or later. * * When SMCCCv1.1 is not present, returns SMCCC_CONDUIT_NONE. */ enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void); /** * 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__) /* SMCCC v1.1 implementation madness follows */ #ifdef CONFIG_ARM64 #define SMCCC_SMC_INST "smc #0" #define SMCCC_HVC_INST "hvc #0" #elif defined(CONFIG_ARM) #include <asm/opcodes-sec.h> #include <asm/opcodes-virt.h> #define SMCCC_SMC_INST __SMC(0) #define SMCCC_HVC_INST __HVC(0) #endif #define ___count_args(_0, _1, _2, _3, _4, _5, _6, _7, _8, x, ...) x #define __count_args(...) \ ___count_args(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0) #define __constraint_write_0 \ "+r" (r0), "=&r" (r1), "=&r" (r2), "=&r" (r3) #define __constraint_write_1 \ "+r" (r0), "+r" (r1), "=&r" (r2), "=&r" (r3) #define __constraint_write_2 \ "+r" (r0), "+r" (r1), "+r" (r2), "=&r" (r3) #define __constraint_write_3 \ "+r" (r0), "+r" (r1), "+r" (r2), "+r" (r3) #define __constraint_write_4 __constraint_write_3 #define __constraint_write_5 __constraint_write_4 #define __constraint_write_6 __constraint_write_5 #define __constraint_write_7 __constraint_write_6 #define __constraint_read_0 #define __constraint_read_1 #define __constraint_read_2 #define __constraint_read_3 #define __constraint_read_4 "r" (r4) #define __constraint_read_5 __constraint_read_4, "r" (r5) #define __constraint_read_6 __constraint_read_5, "r" (r6) #define __constraint_read_7 __constraint_read_6, "r" (r7) #define __declare_arg_0(a0, res) \ struct arm_smccc_res *___res = res; \ register unsigned long r0 asm("r0") = (u32)a0; \ register unsigned long r1 asm("r1"); \ register unsigned long r2 asm("r2"); \ register unsigned long r3 asm("r3") #define __declare_arg_1(a0, a1, res) \ typeof(a1) __a1 = a1; \ struct arm_smccc_res *___res = res; \ register unsigned long r0 asm("r0") = (u32)a0; \ register unsigned long r1 asm("r1") = __a1; \ register unsigned long r2 asm("r2"); \ register unsigned long r3 asm("r3") #define __declare_arg_2(a0, a1, a2, res) \ typeof(a1) __a1 = a1; \ typeof(a2) __a2 = a2; \ struct arm_smccc_res *___res = res; \ register unsigned long r0 asm("r0") = (u32)a0; \ register unsigned long r1 asm("r1") = __a1; \ register unsigned long r2 asm("r2") = __a2; \ register unsigned long r3 asm("r3") #define __declare_arg_3(a0, a1, a2, a3, res) \ typeof(a1) __a1 = a1; \ typeof(a2) __a2 = a2; \ typeof(a3) __a3 = a3; \ struct arm_smccc_res *___res = res; \ register unsigned long r0 asm("r0") = (u32)a0; \ register unsigned long r1 asm("r1") = __a1; \ register unsigned long r2 asm("r2") = __a2; \ register unsigned long r3 asm("r3") = __a3 #define __declare_arg_4(a0, a1, a2, a3, a4, res) \ typeof(a4) __a4 = a4; \ __declare_arg_3(a0, a1, a2, a3, res); \ register unsigned long r4 asm("r4") = __a4 #define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \ typeof(a5) __a5 = a5; \ __declare_arg_4(a0, a1, a2, a3, a4, res); \ register unsigned long r5 asm("r5") = __a5 #define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \ typeof(a6) __a6 = a6; \ __declare_arg_5(a0, a1, a2, a3, a4, a5, res); \ register unsigned long r6 asm("r6") = __a6 #define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \ typeof(a7) __a7 = a7; \ __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \ register unsigned long r7 asm("r7") = __a7 #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__) #define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__) #define ___constraints(count) \ : __constraint_write_ ## count \ : __constraint_read_ ## count \ : "memory" #define __constraints(count) ___constraints(count) /* * We have an output list that is not necessarily used, and GCC feels * entitled to optimise the whole sequence away. "volatile" is what * makes it stick. */ #define __arm_smccc_1_1(inst, ...) \ do { \ __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \ asm volatile(inst "\n" \ __constraints(__count_args(__VA_ARGS__))); \ if (___res) \ *___res = (typeof(*___res)){r0, r1, r2, r3}; \ } while (0) /* * arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call * * This is a variadic macro taking one to eight source arguments, and * an optional return structure. * * @a0-a7: arguments passed in registers 0 to 7 * @res: result values from registers 0 to 3 * * This macro is used to make SMC calls following SMC Calling Convention v1.1. * 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 if not NULL. */ #define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__) /* * arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call * * This is a variadic macro taking one to eight source arguments, and * an optional return structure. * * @a0-a7: arguments passed in registers 0 to 7 * @res: result values from registers 0 to 3 * * This macro is used to make HVC calls following SMC Calling Convention v1.1. * 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 if not NULL. */ #define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__) /* Return codes defined in ARM DEN 0070A */ #define SMCCC_RET_SUCCESS 0 #define SMCCC_RET_NOT_SUPPORTED -1 #define SMCCC_RET_NOT_REQUIRED -2 /* * Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED. * Used when the SMCCC conduit is not defined. The empty asm statement * avoids compiler warnings about unused variables. */ #define __fail_smccc_1_1(...) \ do { \ __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \ asm ("" __constraints(__count_args(__VA_ARGS__))); \ if (___res) \ ___res->a0 = SMCCC_RET_NOT_SUPPORTED; \ } while (0) /* * arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call * * This is a variadic macro taking one to eight source arguments, and * an optional return structure. * * @a0-a7: arguments passed in registers 0 to 7 * @res: result values from registers 0 to 3 * * This macro will make either an HVC call or an SMC call depending on the * current SMCCC conduit. If no valid conduit is available then -1 * (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied). * * The return value also provides the conduit that was used. */ #define arm_smccc_1_1_invoke(...) ({ \ int method = arm_smccc_1_1_get_conduit(); \ switch (method) { \ case SMCCC_CONDUIT_HVC: \ arm_smccc_1_1_hvc(__VA_ARGS__); \ break; \ case SMCCC_CONDUIT_SMC: \ arm_smccc_1_1_smc(__VA_ARGS__); \ break; \ default: \ __fail_smccc_1_1(__VA_ARGS__); \ method = SMCCC_CONDUIT_NONE; \ break; \ } \ method; \ }) /* Paravirtualised time calls (defined by ARM DEN0057A) */ #define ARM_SMCCC_HV_PV_TIME_FEATURES \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_64, \ ARM_SMCCC_OWNER_STANDARD_HYP, \ 0x20) #define ARM_SMCCC_HV_PV_TIME_ST \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_64, \ ARM_SMCCC_OWNER_STANDARD_HYP, \ 0x21) #endif /*__ASSEMBLY__*/ #endif /*__LINUX_ARM_SMCCC_H*/