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arm-smccc.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (c) 2015, Linaro Limited */ #ifndef __LINUX_ARM_SMCCC_H #define __LINUX_ARM_SMCCC_H #include <linux/args.h> #include <linux/init.h> #include <uapi/linux/const.h> /* * This file provides common defines for ARM SMC Calling Convention as * specified in * https://developer.arm.com/docs/den0028/latest * * This code is up-to-date with version DEN 0028 C */ #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_STANDARD_HYP 5 #define ARM_SMCCC_OWNER_VENDOR_HYP 6 #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_FUNC_QUERY_CALL_UID 0xff01 #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_1_2 0x10002 #define ARM_SMCCC_VERSION_1_3 0x10003 #define ARM_SMCCC_1_3_SVE_HINT 0x10000 #define ARM_SMCCC_CALL_HINTS ARM_SMCCC_1_3_SVE_HINT #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_SOC_ID \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ 0, 2) #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 ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ ARM_SMCCC_OWNER_VENDOR_HYP, \ ARM_SMCCC_FUNC_QUERY_CALL_UID) /* KVM UID value: 28b46fb6-2ec5-11e9-a9ca-4b564d003a74 */ #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 0xb66fb428U #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 0xe911c52eU #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 0x564bcaa9U #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3 0x743a004dU /* KVM "vendor specific" services */ #define ARM_SMCCC_KVM_FUNC_FEATURES 0 #define ARM_SMCCC_KVM_FUNC_PTP 1 #define ARM_SMCCC_KVM_FUNC_FEATURES_2 127 #define ARM_SMCCC_KVM_NUM_FUNCS 128 #define ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ ARM_SMCCC_OWNER_VENDOR_HYP, \ ARM_SMCCC_KVM_FUNC_FEATURES) #define SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED 1 /* * ptp_kvm is a feature used for time sync between vm and host. * ptp_kvm module in guest kernel will get service from host using * this hypercall ID. */ #define ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ ARM_SMCCC_OWNER_VENDOR_HYP, \ ARM_SMCCC_KVM_FUNC_PTP) /* ptp_kvm counter type ID */ #define KVM_PTP_VIRT_COUNTER 0 #define KVM_PTP_PHYS_COUNTER 1 /* 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) /* TRNG entropy source calls (defined by ARM DEN0098) */ #define ARM_SMCCC_TRNG_VERSION \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ ARM_SMCCC_OWNER_STANDARD, \ 0x50) #define ARM_SMCCC_TRNG_FEATURES \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ ARM_SMCCC_OWNER_STANDARD, \ 0x51) #define ARM_SMCCC_TRNG_GET_UUID \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ ARM_SMCCC_OWNER_STANDARD, \ 0x52) #define ARM_SMCCC_TRNG_RND32 \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ ARM_SMCCC_OWNER_STANDARD, \ 0x53) #define ARM_SMCCC_TRNG_RND64 \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_64, \ ARM_SMCCC_OWNER_STANDARD, \ 0x53) /* * Return codes defined in ARM DEN 0070A * ARM DEN 0070A is now merged/consolidated into ARM DEN 0028 C */ #define SMCCC_RET_SUCCESS 0 #define SMCCC_RET_NOT_SUPPORTED -1 #define SMCCC_RET_NOT_REQUIRED -2 #define SMCCC_RET_INVALID_PARAMETER -3 #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); /** * arm_smccc_get_version() * * Returns the version to be used for SMCCCv1.1 or later. * * When SMCCCv1.1 or above is not present, returns SMCCCv1.0, but this * does not imply the presence of firmware or a valid conduit. Caller * handling SMCCCv1.0 must determine the conduit by other means. */ u32 arm_smccc_get_version(void); void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit); extern u64 smccc_has_sve_hint; /** * arm_smccc_get_soc_id_version() * * Returns the SOC ID version. * * When ARM_SMCCC_ARCH_SOC_ID is not present, returns SMCCC_RET_NOT_SUPPORTED. */ s32 arm_smccc_get_soc_id_version(void); /** * arm_smccc_get_soc_id_revision() * * Returns the SOC ID revision. * * When ARM_SMCCC_ARCH_SOC_ID is not present, returns SMCCC_RET_NOT_SUPPORTED. */ s32 arm_smccc_get_soc_id_revision(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; }; #ifdef CONFIG_ARM64 /** * struct arm_smccc_1_2_regs - Arguments for or Results from SMC/HVC call * @a0-a17 argument values from registers 0 to 17 */ struct arm_smccc_1_2_regs { unsigned long a0; unsigned long a1; unsigned long a2; unsigned long a3; unsigned long a4; unsigned long a5; unsigned long a6; unsigned long a7; unsigned long a8; unsigned long a9; unsigned long a10; unsigned long a11; unsigned long a12; unsigned long a13; unsigned long a14; unsigned long a15; unsigned long a16; unsigned long a17; }; /** * arm_smccc_1_2_hvc() - make HVC calls * @args: arguments passed via struct arm_smccc_1_2_regs * @res: result values via struct arm_smccc_1_2_regs * * This function is used to make HVC calls following SMC Calling Convention * v1.2 or above. The content of the supplied param are copied from the * structure to registers prior to the HVC instruction. The return values * are updated with the content from registers on return from the HVC * instruction. */ asmlinkage void arm_smccc_1_2_hvc(const struct arm_smccc_1_2_regs *args, struct arm_smccc_1_2_regs *res); /** * arm_smccc_1_2_smc() - make SMC calls * @args: arguments passed via struct arm_smccc_1_2_regs * @res: result values via struct arm_smccc_1_2_regs * * This function is used to make SMC calls following SMC Calling Convention * v1.2 or above. The content of the supplied param are copied from the * structure to registers prior to the SMC instruction. The return values * are updated with the content from registers on return from the SMC * instruction. */ asmlinkage void arm_smccc_1_2_smc(const struct arm_smccc_1_2_regs *args, struct arm_smccc_1_2_regs *res); #endif /** * 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_sve_check() - Set the SVE hint bit when doing SMC calls * * Sets the SMCCC hint bit to indicate if there is live state in the SVE * registers, this modifies x0 in place and should never be called from C * code. */ asmlinkage unsigned long __arm_smccc_sve_check(unsigned long x0); /** * __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. */ #ifdef CONFIG_HAVE_ARM_SMCCC 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); #else static inline 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) { *res = (struct arm_smccc_res){}; } #endif /** * __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 /* nVHE hypervisor doesn't have a current thread so needs separate checks */ #if defined(CONFIG_ARM64_SVE) && !defined(__KVM_NVHE_HYPERVISOR__) #define SMCCC_SVE_CHECK ALTERNATIVE("nop \n", "bl __arm_smccc_sve_check \n", \ ARM64_SVE) #define smccc_sve_clobbers "x16", "x30", "cc", #else #define SMCCC_SVE_CHECK #define smccc_sve_clobbers #endif #define __constraint_read_2 "r" (arg0) #define __constraint_read_3 __constraint_read_2, "r" (arg1) #define __constraint_read_4 __constraint_read_3, "r" (arg2) #define __constraint_read_5 __constraint_read_4, "r" (arg3) #define __constraint_read_6 __constraint_read_5, "r" (arg4) #define __constraint_read_7 __constraint_read_6, "r" (arg5) #define __constraint_read_8 __constraint_read_7, "r" (arg6) #define __constraint_read_9 __constraint_read_8, "r" (arg7) #define __declare_arg_2(a0, res) \ struct arm_smccc_res *___res = res; \ register unsigned long arg0 asm("r0") = (u32)a0 #define __declare_arg_3(a0, a1, res) \ typeof(a1) __a1 = a1; \ struct arm_smccc_res *___res = res; \ register unsigned long arg0 asm("r0") = (u32)a0; \ register typeof(a1) arg1 asm("r1") = __a1 #define __declare_arg_4(a0, a1, a2, res) \ typeof(a1) __a1 = a1; \ typeof(a2) __a2 = a2; \ struct arm_smccc_res *___res = res; \ register unsigned long arg0 asm("r0") = (u32)a0; \ register typeof(a1) arg1 asm("r1") = __a1; \ register typeof(a2) arg2 asm("r2") = __a2 #define __declare_arg_5(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 arg0 asm("r0") = (u32)a0; \ register typeof(a1) arg1 asm("r1") = __a1; \ register typeof(a2) arg2 asm("r2") = __a2; \ register typeof(a3) arg3 asm("r3") = __a3 #define __declare_arg_6(a0, a1, a2, a3, a4, res) \ typeof(a4) __a4 = a4; \ __declare_arg_5(a0, a1, a2, a3, res); \ register typeof(a4) arg4 asm("r4") = __a4 #define __declare_arg_7(a0, a1, a2, a3, a4, a5, res) \ typeof(a5) __a5 = a5; \ __declare_arg_6(a0, a1, a2, a3, a4, res); \ register typeof(a5) arg5 asm("r5") = __a5 #define __declare_arg_8(a0, a1, a2, a3, a4, a5, a6, res) \ typeof(a6) __a6 = a6; \ __declare_arg_7(a0, a1, a2, a3, a4, a5, res); \ register typeof(a6) arg6 asm("r6") = __a6 #define __declare_arg_9(a0, a1, a2, a3, a4, a5, a6, a7, res) \ typeof(a7) __a7 = a7; \ __declare_arg_8(a0, a1, a2, a3, a4, a5, a6, res); \ register typeof(a7) arg7 asm("r7") = __a7 /* * 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 { \ register unsigned long r0 asm("r0"); \ register unsigned long r1 asm("r1"); \ register unsigned long r2 asm("r2"); \ register unsigned long r3 asm("r3"); \ CONCATENATE(__declare_arg_, \ COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__); \ asm volatile(SMCCC_SVE_CHECK \ inst "\n" : \ "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3) \ : CONCATENATE(__constraint_read_, \ COUNT_ARGS(__VA_ARGS__)) \ : smccc_sve_clobbers "memory"); \ 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__) /* * 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 { \ CONCATENATE(__declare_arg_, \ COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__); \ asm ("" : \ : CONCATENATE(__constraint_read_, \ COUNT_ARGS(__VA_ARGS__)) \ : smccc_sve_clobbers "memory"); \ 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; \ }) #endif /*__ASSEMBLY__*/ #endif /*__LINUX_ARM_SMCCC_H*/
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