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98dd64f3 JW |
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 | ||
ded4c39e MZ |
17 | #include <uapi/linux/const.h> |
18 | ||
98dd64f3 JW |
19 | /* |
20 | * This file provides common defines for ARM SMC Calling Convention as | |
21 | * specified in | |
22 | * http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html | |
23 | */ | |
24 | ||
ded4c39e MZ |
25 | #define ARM_SMCCC_STD_CALL _AC(0,U) |
26 | #define ARM_SMCCC_FAST_CALL _AC(1,U) | |
98dd64f3 JW |
27 | #define ARM_SMCCC_TYPE_SHIFT 31 |
28 | ||
29 | #define ARM_SMCCC_SMC_32 0 | |
30 | #define ARM_SMCCC_SMC_64 1 | |
31 | #define ARM_SMCCC_CALL_CONV_SHIFT 30 | |
32 | ||
33 | #define ARM_SMCCC_OWNER_MASK 0x3F | |
34 | #define ARM_SMCCC_OWNER_SHIFT 24 | |
35 | ||
36 | #define ARM_SMCCC_FUNC_MASK 0xFFFF | |
37 | ||
38 | #define ARM_SMCCC_IS_FAST_CALL(smc_val) \ | |
39 | ((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT)) | |
40 | #define ARM_SMCCC_IS_64(smc_val) \ | |
41 | ((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT)) | |
42 | #define ARM_SMCCC_FUNC_NUM(smc_val) ((smc_val) & ARM_SMCCC_FUNC_MASK) | |
43 | #define ARM_SMCCC_OWNER_NUM(smc_val) \ | |
44 | (((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK) | |
45 | ||
46 | #define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \ | |
47 | (((type) << ARM_SMCCC_TYPE_SHIFT) | \ | |
48 | ((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \ | |
49 | (((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \ | |
50 | ((func_num) & ARM_SMCCC_FUNC_MASK)) | |
51 | ||
52 | #define ARM_SMCCC_OWNER_ARCH 0 | |
53 | #define ARM_SMCCC_OWNER_CPU 1 | |
54 | #define ARM_SMCCC_OWNER_SIP 2 | |
55 | #define ARM_SMCCC_OWNER_OEM 3 | |
56 | #define ARM_SMCCC_OWNER_STANDARD 4 | |
57 | #define ARM_SMCCC_OWNER_TRUSTED_APP 48 | |
58 | #define ARM_SMCCC_OWNER_TRUSTED_APP_END 49 | |
59 | #define ARM_SMCCC_OWNER_TRUSTED_OS 50 | |
60 | #define ARM_SMCCC_OWNER_TRUSTED_OS_END 63 | |
61 | ||
82bcd087 AG |
62 | #define ARM_SMCCC_QUIRK_NONE 0 |
63 | #define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */ | |
64 | ||
09e6be12 MZ |
65 | #define ARM_SMCCC_VERSION_1_0 0x10000 |
66 | #define ARM_SMCCC_VERSION_1_1 0x10001 | |
67 | ||
68 | #define ARM_SMCCC_VERSION_FUNC_ID \ | |
69 | ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ | |
70 | ARM_SMCCC_SMC_32, \ | |
71 | 0, 0) | |
72 | ||
73 | #define ARM_SMCCC_ARCH_FEATURES_FUNC_ID \ | |
74 | ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ | |
75 | ARM_SMCCC_SMC_32, \ | |
76 | 0, 1) | |
77 | ||
6167ec5c MZ |
78 | #define ARM_SMCCC_ARCH_WORKAROUND_1 \ |
79 | ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ | |
80 | ARM_SMCCC_SMC_32, \ | |
81 | 0, 0x8000) | |
82 | ||
82bcd087 AG |
83 | #ifndef __ASSEMBLY__ |
84 | ||
85 | #include <linux/linkage.h> | |
86 | #include <linux/types.h> | |
98dd64f3 JW |
87 | /** |
88 | * struct arm_smccc_res - Result from SMC/HVC call | |
89 | * @a0-a3 result values from registers 0 to 3 | |
90 | */ | |
91 | struct arm_smccc_res { | |
92 | unsigned long a0; | |
93 | unsigned long a1; | |
94 | unsigned long a2; | |
95 | unsigned long a3; | |
96 | }; | |
97 | ||
98 | /** | |
680a0873 AG |
99 | * struct arm_smccc_quirk - Contains quirk information |
100 | * @id: quirk identification | |
101 | * @state: quirk specific information | |
102 | * @a6: Qualcomm quirk entry for returning post-smc call contents of a6 | |
103 | */ | |
104 | struct arm_smccc_quirk { | |
105 | int id; | |
106 | union { | |
107 | unsigned long a6; | |
108 | } state; | |
109 | }; | |
110 | ||
111 | /** | |
112 | * __arm_smccc_smc() - make SMC calls | |
98dd64f3 JW |
113 | * @a0-a7: arguments passed in registers 0 to 7 |
114 | * @res: result values from registers 0 to 3 | |
680a0873 | 115 | * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. |
98dd64f3 JW |
116 | * |
117 | * This function is used to make SMC calls following SMC Calling Convention. | |
118 | * The content of the supplied param are copied to registers 0 to 7 prior | |
119 | * to the SMC instruction. The return values are updated with the content | |
680a0873 AG |
120 | * from register 0 to 3 on return from the SMC instruction. An optional |
121 | * quirk structure provides vendor specific behavior. | |
98dd64f3 | 122 | */ |
680a0873 | 123 | asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1, |
98dd64f3 JW |
124 | unsigned long a2, unsigned long a3, unsigned long a4, |
125 | unsigned long a5, unsigned long a6, unsigned long a7, | |
680a0873 | 126 | struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); |
98dd64f3 JW |
127 | |
128 | /** | |
680a0873 | 129 | * __arm_smccc_hvc() - make HVC calls |
98dd64f3 JW |
130 | * @a0-a7: arguments passed in registers 0 to 7 |
131 | * @res: result values from registers 0 to 3 | |
3046ec67 | 132 | * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. |
98dd64f3 JW |
133 | * |
134 | * This function is used to make HVC calls following SMC Calling | |
135 | * Convention. The content of the supplied param are copied to registers 0 | |
136 | * to 7 prior to the HVC instruction. The return values are updated with | |
680a0873 AG |
137 | * the content from register 0 to 3 on return from the HVC instruction. An |
138 | * optional quirk structure provides vendor specific behavior. | |
98dd64f3 | 139 | */ |
680a0873 | 140 | asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1, |
98dd64f3 JW |
141 | unsigned long a2, unsigned long a3, unsigned long a4, |
142 | unsigned long a5, unsigned long a6, unsigned long a7, | |
680a0873 AG |
143 | struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); |
144 | ||
145 | #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL) | |
146 | ||
147 | #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__) | |
148 | ||
149 | #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL) | |
150 | ||
151 | #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__) | |
98dd64f3 | 152 | |
f2d3b2e8 MZ |
153 | /* SMCCC v1.1 implementation madness follows */ |
154 | #ifdef CONFIG_ARM64 | |
155 | ||
156 | #define SMCCC_SMC_INST "smc #0" | |
157 | #define SMCCC_HVC_INST "hvc #0" | |
158 | ||
159 | #elif defined(CONFIG_ARM) | |
160 | #include <asm/opcodes-sec.h> | |
161 | #include <asm/opcodes-virt.h> | |
162 | ||
163 | #define SMCCC_SMC_INST __SMC(0) | |
164 | #define SMCCC_HVC_INST __HVC(0) | |
165 | ||
166 | #endif | |
167 | ||
168 | #define ___count_args(_0, _1, _2, _3, _4, _5, _6, _7, _8, x, ...) x | |
169 | ||
170 | #define __count_args(...) \ | |
171 | ___count_args(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0) | |
172 | ||
173 | #define __constraint_write_0 \ | |
174 | "+r" (r0), "=&r" (r1), "=&r" (r2), "=&r" (r3) | |
175 | #define __constraint_write_1 \ | |
176 | "+r" (r0), "+r" (r1), "=&r" (r2), "=&r" (r3) | |
177 | #define __constraint_write_2 \ | |
178 | "+r" (r0), "+r" (r1), "+r" (r2), "=&r" (r3) | |
179 | #define __constraint_write_3 \ | |
180 | "+r" (r0), "+r" (r1), "+r" (r2), "+r" (r3) | |
181 | #define __constraint_write_4 __constraint_write_3 | |
182 | #define __constraint_write_5 __constraint_write_4 | |
183 | #define __constraint_write_6 __constraint_write_5 | |
184 | #define __constraint_write_7 __constraint_write_6 | |
185 | ||
186 | #define __constraint_read_0 | |
187 | #define __constraint_read_1 | |
188 | #define __constraint_read_2 | |
189 | #define __constraint_read_3 | |
190 | #define __constraint_read_4 "r" (r4) | |
191 | #define __constraint_read_5 __constraint_read_4, "r" (r5) | |
192 | #define __constraint_read_6 __constraint_read_5, "r" (r6) | |
193 | #define __constraint_read_7 __constraint_read_6, "r" (r7) | |
194 | ||
195 | #define __declare_arg_0(a0, res) \ | |
196 | struct arm_smccc_res *___res = res; \ | |
197 | register u32 r0 asm("r0") = a0; \ | |
198 | register unsigned long r1 asm("r1"); \ | |
199 | register unsigned long r2 asm("r2"); \ | |
200 | register unsigned long r3 asm("r3") | |
201 | ||
202 | #define __declare_arg_1(a0, a1, res) \ | |
203 | struct arm_smccc_res *___res = res; \ | |
204 | register u32 r0 asm("r0") = a0; \ | |
205 | register typeof(a1) r1 asm("r1") = a1; \ | |
206 | register unsigned long r2 asm("r2"); \ | |
207 | register unsigned long r3 asm("r3") | |
208 | ||
209 | #define __declare_arg_2(a0, a1, a2, res) \ | |
210 | struct arm_smccc_res *___res = res; \ | |
211 | register u32 r0 asm("r0") = a0; \ | |
212 | register typeof(a1) r1 asm("r1") = a1; \ | |
213 | register typeof(a2) r2 asm("r2") = a2; \ | |
214 | register unsigned long r3 asm("r3") | |
215 | ||
216 | #define __declare_arg_3(a0, a1, a2, a3, res) \ | |
217 | struct arm_smccc_res *___res = res; \ | |
218 | register u32 r0 asm("r0") = a0; \ | |
219 | register typeof(a1) r1 asm("r1") = a1; \ | |
220 | register typeof(a2) r2 asm("r2") = a2; \ | |
221 | register typeof(a3) r3 asm("r3") = a3 | |
222 | ||
223 | #define __declare_arg_4(a0, a1, a2, a3, a4, res) \ | |
224 | __declare_arg_3(a0, a1, a2, a3, res); \ | |
225 | register typeof(a4) r4 asm("r4") = a4 | |
226 | ||
227 | #define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \ | |
228 | __declare_arg_4(a0, a1, a2, a3, a4, res); \ | |
229 | register typeof(a5) r5 asm("r5") = a5 | |
230 | ||
231 | #define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \ | |
232 | __declare_arg_5(a0, a1, a2, a3, a4, a5, res); \ | |
233 | register typeof(a6) r6 asm("r6") = a6 | |
234 | ||
235 | #define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \ | |
236 | __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \ | |
237 | register typeof(a7) r7 asm("r7") = a7 | |
238 | ||
239 | #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__) | |
240 | #define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__) | |
241 | ||
242 | #define ___constraints(count) \ | |
243 | : __constraint_write_ ## count \ | |
244 | : __constraint_read_ ## count \ | |
245 | : "memory" | |
246 | #define __constraints(count) ___constraints(count) | |
247 | ||
248 | /* | |
249 | * We have an output list that is not necessarily used, and GCC feels | |
250 | * entitled to optimise the whole sequence away. "volatile" is what | |
251 | * makes it stick. | |
252 | */ | |
253 | #define __arm_smccc_1_1(inst, ...) \ | |
254 | do { \ | |
255 | __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \ | |
256 | asm volatile(inst "\n" \ | |
257 | __constraints(__count_args(__VA_ARGS__))); \ | |
258 | if (___res) \ | |
259 | *___res = (typeof(*___res)){r0, r1, r2, r3}; \ | |
260 | } while (0) | |
261 | ||
262 | /* | |
263 | * arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call | |
264 | * | |
265 | * This is a variadic macro taking one to eight source arguments, and | |
266 | * an optional return structure. | |
267 | * | |
268 | * @a0-a7: arguments passed in registers 0 to 7 | |
269 | * @res: result values from registers 0 to 3 | |
270 | * | |
271 | * This macro is used to make SMC calls following SMC Calling Convention v1.1. | |
272 | * The content of the supplied param are copied to registers 0 to 7 prior | |
273 | * to the SMC instruction. The return values are updated with the content | |
274 | * from register 0 to 3 on return from the SMC instruction if not NULL. | |
275 | */ | |
276 | #define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__) | |
277 | ||
278 | /* | |
279 | * arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call | |
280 | * | |
281 | * This is a variadic macro taking one to eight source arguments, and | |
282 | * an optional return structure. | |
283 | * | |
284 | * @a0-a7: arguments passed in registers 0 to 7 | |
285 | * @res: result values from registers 0 to 3 | |
286 | * | |
287 | * This macro is used to make HVC calls following SMC Calling Convention v1.1. | |
288 | * The content of the supplied param are copied to registers 0 to 7 prior | |
289 | * to the HVC instruction. The return values are updated with the content | |
290 | * from register 0 to 3 on return from the HVC instruction if not NULL. | |
291 | */ | |
292 | #define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__) | |
293 | ||
82bcd087 | 294 | #endif /*__ASSEMBLY__*/ |
98dd64f3 | 295 | #endif /*__LINUX_ARM_SMCCC_H*/ |