blob: b5abfda80465a10bf14caed699f57bd7abec8567 [file] [log] [blame]
Jens Wiklander98dd64f2016-01-04 15:37:32 +01001/*
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 */
67struct 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 */
84asmlinkage 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 */
99asmlinkage 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*/