1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2015, Linaro Limited 4 */ 5 #ifndef __LINUX_ARM_SMCCC_H 6 #define __LINUX_ARM_SMCCC_H 7 8 /* 9 * This file provides common defines for ARM SMC Calling Convention as 10 * specified in 11 * http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html 12 */ 13 14 #define ARM_SMCCC_STD_CALL 0 15 #define ARM_SMCCC_FAST_CALL 1 16 #define ARM_SMCCC_TYPE_SHIFT 31 17 18 #define ARM_SMCCC_SMC_32 0 19 #define ARM_SMCCC_SMC_64 1 20 #define ARM_SMCCC_CALL_CONV_SHIFT 30 21 22 #define ARM_SMCCC_OWNER_MASK 0x3F 23 #define ARM_SMCCC_OWNER_SHIFT 24 24 25 #define ARM_SMCCC_FUNC_MASK 0xFFFF 26 27 #define ARM_SMCCC_IS_FAST_CALL(smc_val) \ 28 ((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT)) 29 #define ARM_SMCCC_IS_64(smc_val) \ 30 ((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT)) 31 #define ARM_SMCCC_FUNC_NUM(smc_val) ((smc_val) & ARM_SMCCC_FUNC_MASK) 32 #define ARM_SMCCC_OWNER_NUM(smc_val) \ 33 (((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK) 34 35 #define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \ 36 (((type) << ARM_SMCCC_TYPE_SHIFT) | \ 37 ((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \ 38 (((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \ 39 ((func_num) & ARM_SMCCC_FUNC_MASK)) 40 41 #define ARM_SMCCC_OWNER_ARCH 0 42 #define ARM_SMCCC_OWNER_CPU 1 43 #define ARM_SMCCC_OWNER_SIP 2 44 #define ARM_SMCCC_OWNER_OEM 3 45 #define ARM_SMCCC_OWNER_STANDARD 4 46 #define ARM_SMCCC_OWNER_TRUSTED_APP 48 47 #define ARM_SMCCC_OWNER_TRUSTED_APP_END 49 48 #define ARM_SMCCC_OWNER_TRUSTED_OS 50 49 #define ARM_SMCCC_OWNER_TRUSTED_OS_END 63 50 51 #define ARM_SMCCC_QUIRK_NONE 0 52 #define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */ 53 54 #ifndef __ASSEMBLY__ 55 56 #include <linux/linkage.h> 57 #include <linux/types.h> 58 /** 59 * struct arm_smccc_res - Result from SMC/HVC call 60 * @a0-a3 result values from registers 0 to 3 61 */ 62 struct arm_smccc_res { 63 unsigned long a0; 64 unsigned long a1; 65 unsigned long a2; 66 unsigned long a3; 67 }; 68 69 /** 70 * struct arm_smccc_quirk - Contains quirk information 71 * @id: quirk identification 72 * @state: quirk specific information 73 * @a6: Qualcomm quirk entry for returning post-smc call contents of a6 74 */ 75 struct arm_smccc_quirk { 76 int id; 77 union { 78 unsigned long a6; 79 } state; 80 }; 81 82 /** 83 * __arm_smccc_smc() - make SMC calls 84 * @a0-a7: arguments passed in registers 0 to 7 85 * @res: result values from registers 0 to 3 86 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. 87 * 88 * This function is used to make SMC calls following SMC Calling Convention. 89 * The content of the supplied param are copied to registers 0 to 7 prior 90 * to the SMC instruction. The return values are updated with the content 91 * from register 0 to 3 on return from the SMC instruction. An optional 92 * quirk structure provides vendor specific behavior. 93 */ 94 asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1, 95 unsigned long a2, unsigned long a3, unsigned long a4, 96 unsigned long a5, unsigned long a6, unsigned long a7, 97 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); 98 99 /** 100 * __arm_smccc_hvc() - make HVC calls 101 * @a0-a7: arguments passed in registers 0 to 7 102 * @res: result values from registers 0 to 3 103 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. 104 * 105 * This function is used to make HVC calls following SMC Calling 106 * Convention. The content of the supplied param are copied to registers 0 107 * to 7 prior to the HVC instruction. The return values are updated with 108 * the content from register 0 to 3 on return from the HVC instruction. An 109 * optional quirk structure provides vendor specific behavior. 110 */ 111 asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1, 112 unsigned long a2, unsigned long a3, unsigned long a4, 113 unsigned long a5, unsigned long a6, unsigned long a7, 114 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); 115 116 #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL) 117 118 #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__) 119 120 #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL) 121 122 #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__) 123 124 #endif /*__ASSEMBLY__*/ 125 #endif /*__LINUX_ARM_SMCCC_H*/ 126
