1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (c) 2015, Linaro Limited
4 */
5#include <linux/linkage.h>
6#include <linux/arm-smccc.h>
7
8#include <asm/asm-offsets.h>
9#include <asm/assembler.h>
10
11 .macro SMCCC instr
12 \instr #0
13 ldr x4, [sp]
14 stp x0, x1, [x4, #ARM_SMCCC_RES_X0_OFFS]
15 stp x2, x3, [x4, #ARM_SMCCC_RES_X2_OFFS]
16 ldr x4, [sp, #8]
17 cbz x4, 1f /* no quirk structure */
18 ldr x9, [x4, #ARM_SMCCC_QUIRK_ID_OFFS]
19 cmp x9, #ARM_SMCCC_QUIRK_QCOM_A6
20 b.ne 1f
21 str x6, [x4, ARM_SMCCC_QUIRK_STATE_OFFS]
221: ret
23 .endm
24
25/*
26 * void arm_smccc_smc(unsigned long a0, unsigned long a1, unsigned long a2,
27 * unsigned long a3, unsigned long a4, unsigned long a5,
28 * unsigned long a6, unsigned long a7, struct arm_smccc_res *res,
29 * struct arm_smccc_quirk *quirk)
30 */
31SYM_FUNC_START(__arm_smccc_smc)
32 SMCCC smc
33SYM_FUNC_END(__arm_smccc_smc)
34EXPORT_SYMBOL(__arm_smccc_smc)
35
36/*
37 * void arm_smccc_hvc(unsigned long a0, unsigned long a1, unsigned long a2,
38 * unsigned long a3, unsigned long a4, unsigned long a5,
39 * unsigned long a6, unsigned long a7, struct arm_smccc_res *res,
40 * struct arm_smccc_quirk *quirk)
41 */
42SYM_FUNC_START(__arm_smccc_hvc)
43 SMCCC hvc
44SYM_FUNC_END(__arm_smccc_hvc)
45EXPORT_SYMBOL(__arm_smccc_hvc)
46
47 .macro SMCCC_1_2 instr
48 /* Save `res` and free a GPR that won't be clobbered */
49 stp x1, x19, [sp, #-16]!
50
51 /* Ensure `args` won't be clobbered while loading regs in next step */
52 mov x19, x0
53
54 /* Load the registers x0 - x17 from the struct arm_smccc_1_2_regs */
55 ldp x0, x1, [x19, #ARM_SMCCC_1_2_REGS_X0_OFFS]
56 ldp x2, x3, [x19, #ARM_SMCCC_1_2_REGS_X2_OFFS]
57 ldp x4, x5, [x19, #ARM_SMCCC_1_2_REGS_X4_OFFS]
58 ldp x6, x7, [x19, #ARM_SMCCC_1_2_REGS_X6_OFFS]
59 ldp x8, x9, [x19, #ARM_SMCCC_1_2_REGS_X8_OFFS]
60 ldp x10, x11, [x19, #ARM_SMCCC_1_2_REGS_X10_OFFS]
61 ldp x12, x13, [x19, #ARM_SMCCC_1_2_REGS_X12_OFFS]
62 ldp x14, x15, [x19, #ARM_SMCCC_1_2_REGS_X14_OFFS]
63 ldp x16, x17, [x19, #ARM_SMCCC_1_2_REGS_X16_OFFS]
64
65 \instr #0
66
67 /* Load the `res` from the stack */
68 ldr x19, [sp]
69
70 /* Store the registers x0 - x17 into the result structure */
71 stp x0, x1, [x19, #ARM_SMCCC_1_2_REGS_X0_OFFS]
72 stp x2, x3, [x19, #ARM_SMCCC_1_2_REGS_X2_OFFS]
73 stp x4, x5, [x19, #ARM_SMCCC_1_2_REGS_X4_OFFS]
74 stp x6, x7, [x19, #ARM_SMCCC_1_2_REGS_X6_OFFS]
75 stp x8, x9, [x19, #ARM_SMCCC_1_2_REGS_X8_OFFS]
76 stp x10, x11, [x19, #ARM_SMCCC_1_2_REGS_X10_OFFS]
77 stp x12, x13, [x19, #ARM_SMCCC_1_2_REGS_X12_OFFS]
78 stp x14, x15, [x19, #ARM_SMCCC_1_2_REGS_X14_OFFS]
79 stp x16, x17, [x19, #ARM_SMCCC_1_2_REGS_X16_OFFS]
80
81 /* Restore original x19 */
82 ldp xzr, x19, [sp], #16
83 ret
84.endm
85
86/*
87 * void arm_smccc_1_2_hvc(const struct arm_smccc_1_2_regs *args,
88 * struct arm_smccc_1_2_regs *res);
89 */
90SYM_FUNC_START(arm_smccc_1_2_hvc)
91 SMCCC_1_2 hvc
92SYM_FUNC_END(arm_smccc_1_2_hvc)
93EXPORT_SYMBOL(arm_smccc_1_2_hvc)
94
95/*
96 * void arm_smccc_1_2_smc(const struct arm_smccc_1_2_regs *args,
97 * struct arm_smccc_1_2_regs *res);
98 */
99SYM_FUNC_START(arm_smccc_1_2_smc)
100 SMCCC_1_2 smc
101SYM_FUNC_END(arm_smccc_1_2_smc)
102EXPORT_SYMBOL(arm_smccc_1_2_smc)
103

source code of linux/arch/arm64/kernel/smccc-call.S