1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2015, Linaro Limited
* Copyright 2022-2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
*
* Authors:
* Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
*/
#ifndef __LINUX_ARM_SMCCC_H
#define __LINUX_ARM_SMCCC_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 0UL
#define ARM_SMCCC_FAST_CALL 1UL
#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_ARCH_FEATURES 0x80000001
#define ARM_SMCCC_RET_NOT_SUPPORTED ((unsigned long)-1)
#ifndef __ASSEMBLY__
#include <linux/linkage.h>
#include <linux/types.h>
/**
* 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 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_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;
};
/**
* struct arm_smccc_feature - Driver registration data for discoverable feature
* @driver_name: name of the driver relate to the SMCCC feature
* @is_supported: callback to test if SMCCC feature is supported
*/
struct arm_smccc_feature {
const char *driver_name;
bool (*is_supported)(void (*invoke_fn)(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));
};
#define ARM_SMCCC_FEATURE_DRIVER(__name) \
ll_entry_declare(struct arm_smccc_feature, __name, arm_smccc_feature)
/**
* __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__)
#endif /*__ASSEMBLY__*/
#endif /*__LINUX_ARM_SMCCC_H*/
|