1 /* 2 * Copyright (c) 2015, Linaro Limited 3 * 4 * This software is licensed under the terms of the GNU General Public 5 * License version 2, as published by the Free Software Foundation, and 6 * may be copied, distributed, and modified under those terms. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 */ 14 #ifndef __LINUX_ARM_SMCCC_H 15 #define __LINUX_ARM_SMCCC_H 16 17 #include <linux/linkage.h> 18 #include <linux/types.h> 19 20 /* 21 * This file provides common defines for ARM SMC Calling Convention as 22 * specified in 23 * http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html 24 */ 25 26 #define ARM_SMCCC_STD_CALL 0 27 #define ARM_SMCCC_FAST_CALL 1 28 #define ARM_SMCCC_TYPE_SHIFT 31 29 30 #define ARM_SMCCC_SMC_32 0 31 #define ARM_SMCCC_SMC_64 1 32 #define ARM_SMCCC_CALL_CONV_SHIFT 30 33 34 #define ARM_SMCCC_OWNER_MASK 0x3F 35 #define ARM_SMCCC_OWNER_SHIFT 24 36 37 #define ARM_SMCCC_FUNC_MASK 0xFFFF 38 39 #define ARM_SMCCC_IS_FAST_CALL(smc_val) \ 40 ((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT)) 41 #define ARM_SMCCC_IS_64(smc_val) \ 42 ((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT)) 43 #define ARM_SMCCC_FUNC_NUM(smc_val) ((smc_val) & ARM_SMCCC_FUNC_MASK) 44 #define ARM_SMCCC_OWNER_NUM(smc_val) \ 45 (((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK) 46 47 #define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \ 48 (((type) << ARM_SMCCC_TYPE_SHIFT) | \ 49 ((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \ 50 (((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \ 51 ((func_num) & ARM_SMCCC_FUNC_MASK)) 52 53 #define ARM_SMCCC_OWNER_ARCH 0 54 #define ARM_SMCCC_OWNER_CPU 1 55 #define ARM_SMCCC_OWNER_SIP 2 56 #define ARM_SMCCC_OWNER_OEM 3 57 #define ARM_SMCCC_OWNER_STANDARD 4 58 #define ARM_SMCCC_OWNER_TRUSTED_APP 48 59 #define ARM_SMCCC_OWNER_TRUSTED_APP_END 49 60 #define ARM_SMCCC_OWNER_TRUSTED_OS 50 61 #define ARM_SMCCC_OWNER_TRUSTED_OS_END 63 62 63 /** 64 * struct arm_smccc_res - Result from SMC/HVC call 65 * @a0-a3 result values from registers 0 to 3 66 */ 67 struct arm_smccc_res { 68 unsigned long a0; 69 unsigned long a1; 70 unsigned long a2; 71 unsigned long a3; 72 }; 73 74 /** 75 * arm_smccc_smc() - make SMC calls 76 * @a0-a7: arguments passed in registers 0 to 7 77 * @res: result values from registers 0 to 3 78 * 79 * This function is used to make SMC calls following SMC Calling Convention. 80 * The content of the supplied param are copied to registers 0 to 7 prior 81 * to the SMC instruction. The return values are updated with the content 82 * from register 0 to 3 on return from the SMC instruction. 83 */ 84 asmlinkage void arm_smccc_smc(unsigned long a0, unsigned long a1, 85 unsigned long a2, unsigned long a3, unsigned long a4, 86 unsigned long a5, unsigned long a6, unsigned long a7, 87 struct arm_smccc_res *res); 88 89 /** 90 * arm_smccc_hvc() - make HVC calls 91 * @a0-a7: arguments passed in registers 0 to 7 92 * @res: result values from registers 0 to 3 93 * 94 * This function is used to make HVC calls following SMC Calling 95 * Convention. The content of the supplied param are copied to registers 0 96 * to 7 prior to the HVC instruction. The return values are updated with 97 * the content from register 0 to 3 on return from the HVC instruction. 98 */ 99 asmlinkage void arm_smccc_hvc(unsigned long a0, unsigned long a1, 100 unsigned long a2, unsigned long a3, unsigned long a4, 101 unsigned long a5, unsigned long a6, unsigned long a7, 102 struct arm_smccc_res *res); 103 104 #endif /*__LINUX_ARM_SMCCC_H*/ 105