1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (c) 2015, Linaro Limited
4 * Copyright 2022-2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
7 * Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
9 #ifndef __LINUX_ARM_SMCCC_H
10 #define __LINUX_ARM_SMCCC_H
13 * This file provides common defines for ARM SMC Calling Convention as
15 * http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html
18 #define ARM_SMCCC_STD_CALL 0UL
19 #define ARM_SMCCC_FAST_CALL 1UL
20 #define ARM_SMCCC_TYPE_SHIFT 31
22 #define ARM_SMCCC_SMC_32 0
23 #define ARM_SMCCC_SMC_64 1
24 #define ARM_SMCCC_CALL_CONV_SHIFT 30
26 #define ARM_SMCCC_OWNER_MASK 0x3F
27 #define ARM_SMCCC_OWNER_SHIFT 24
29 #define ARM_SMCCC_FUNC_MASK 0xFFFF
31 #define ARM_SMCCC_IS_FAST_CALL(smc_val) \
32 ((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT))
33 #define ARM_SMCCC_IS_64(smc_val) \
34 ((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT))
35 #define ARM_SMCCC_FUNC_NUM(smc_val) ((smc_val) & ARM_SMCCC_FUNC_MASK)
36 #define ARM_SMCCC_OWNER_NUM(smc_val) \
37 (((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK)
39 #define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \
40 (((type) << ARM_SMCCC_TYPE_SHIFT) | \
41 ((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \
42 (((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \
43 ((func_num) & ARM_SMCCC_FUNC_MASK))
45 #define ARM_SMCCC_OWNER_ARCH 0
46 #define ARM_SMCCC_OWNER_CPU 1
47 #define ARM_SMCCC_OWNER_SIP 2
48 #define ARM_SMCCC_OWNER_OEM 3
49 #define ARM_SMCCC_OWNER_STANDARD 4
50 #define ARM_SMCCC_OWNER_TRUSTED_APP 48
51 #define ARM_SMCCC_OWNER_TRUSTED_APP_END 49
52 #define ARM_SMCCC_OWNER_TRUSTED_OS 50
53 #define ARM_SMCCC_OWNER_TRUSTED_OS_END 63
55 #define ARM_SMCCC_QUIRK_NONE 0
56 #define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */
58 #define ARM_SMCCC_ARCH_FEATURES 0x80000001
60 #define ARM_SMCCC_RET_NOT_SUPPORTED ((unsigned long)-1)
64 #include <linux/linkage.h>
65 #include <linux/types.h>
67 * struct arm_smccc_res - Result from SMC/HVC call
68 * @a0-a3 result values from registers 0 to 3
70 struct arm_smccc_res {
79 * struct arm_smccc_1_2_regs - Arguments for or Results from SMC call
80 * @a0-a17 argument values from registers 0 to 17
82 struct arm_smccc_1_2_regs {
104 * arm_smccc_1_2_smc() - make SMC calls
105 * @args: arguments passed via struct arm_smccc_1_2_regs
106 * @res: result values via struct arm_smccc_1_2_regs
108 * This function is used to make SMC calls following SMC Calling Convention
109 * v1.2 or above. The content of the supplied param are copied from the
110 * structure to registers prior to the SMC instruction. The return values
111 * are updated with the content from registers on return from the SMC
114 asmlinkage void arm_smccc_1_2_smc(const struct arm_smccc_1_2_regs *args,
115 struct arm_smccc_1_2_regs *res);
119 * struct arm_smccc_quirk - Contains quirk information
120 * @id: quirk identification
121 * @state: quirk specific information
122 * @a6: Qualcomm quirk entry for returning post-smc call contents of a6
124 struct arm_smccc_quirk {
132 * struct arm_smccc_feature - Driver registration data for discoverable feature
133 * @driver_name: name of the driver relate to the SMCCC feature
134 * @is_supported: callback to test if SMCCC feature is supported
136 struct arm_smccc_feature {
137 const char *driver_name;
138 bool (*is_supported)(void (*invoke_fn)(unsigned long a0, unsigned long a1, unsigned long a2,
139 unsigned long a3, unsigned long a4, unsigned long a5,
140 unsigned long a6, unsigned long a7,
141 struct arm_smccc_res *res));
144 #define ARM_SMCCC_FEATURE_DRIVER(__name) \
145 ll_entry_declare(struct arm_smccc_feature, __name, arm_smccc_feature)
148 * __arm_smccc_smc() - make SMC calls
149 * @a0-a7: arguments passed in registers 0 to 7
150 * @res: result values from registers 0 to 3
151 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
153 * This function is used to make SMC calls following SMC Calling Convention.
154 * The content of the supplied param are copied to registers 0 to 7 prior
155 * to the SMC instruction. The return values are updated with the content
156 * from register 0 to 3 on return from the SMC instruction. An optional
157 * quirk structure provides vendor specific behavior.
159 asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1,
160 unsigned long a2, unsigned long a3, unsigned long a4,
161 unsigned long a5, unsigned long a6, unsigned long a7,
162 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
165 * __arm_smccc_hvc() - make HVC calls
166 * @a0-a7: arguments passed in registers 0 to 7
167 * @res: result values from registers 0 to 3
168 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
170 * This function is used to make HVC calls following SMC Calling
171 * Convention. The content of the supplied param are copied to registers 0
172 * to 7 prior to the HVC instruction. The return values are updated with
173 * the content from register 0 to 3 on return from the HVC instruction. An
174 * optional quirk structure provides vendor specific behavior.
176 asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
177 unsigned long a2, unsigned long a3, unsigned long a4,
178 unsigned long a5, unsigned long a6, unsigned long a7,
179 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
181 #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)
183 #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__)
185 #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL)
187 #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__)
189 #endif /*__ASSEMBLY__*/
190 #endif /*__LINUX_ARM_SMCCC_H*/