]>
Commit | Line | Data |
---|---|---|
1 | /* SPDX-License-Identifier: GPL-2.0-only */ | |
2 | /* | |
3 | * Copyright (c) 2015, Linaro Limited | |
4 | */ | |
5 | #ifndef __LINUX_ARM_SMCCC_H | |
6 | #define __LINUX_ARM_SMCCC_H | |
7 | ||
8 | #include <uapi/linux/const.h> | |
9 | ||
10 | /* | |
11 | * This file provides common defines for ARM SMC Calling Convention as | |
12 | * specified in | |
13 | * http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html | |
14 | */ | |
15 | ||
16 | #define ARM_SMCCC_STD_CALL _AC(0,U) | |
17 | #define ARM_SMCCC_FAST_CALL _AC(1,U) | |
18 | #define ARM_SMCCC_TYPE_SHIFT 31 | |
19 | ||
20 | #define ARM_SMCCC_SMC_32 0 | |
21 | #define ARM_SMCCC_SMC_64 1 | |
22 | #define ARM_SMCCC_CALL_CONV_SHIFT 30 | |
23 | ||
24 | #define ARM_SMCCC_OWNER_MASK 0x3F | |
25 | #define ARM_SMCCC_OWNER_SHIFT 24 | |
26 | ||
27 | #define ARM_SMCCC_FUNC_MASK 0xFFFF | |
28 | ||
29 | #define ARM_SMCCC_IS_FAST_CALL(smc_val) \ | |
30 | ((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT)) | |
31 | #define ARM_SMCCC_IS_64(smc_val) \ | |
32 | ((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT)) | |
33 | #define ARM_SMCCC_FUNC_NUM(smc_val) ((smc_val) & ARM_SMCCC_FUNC_MASK) | |
34 | #define ARM_SMCCC_OWNER_NUM(smc_val) \ | |
35 | (((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK) | |
36 | ||
37 | #define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \ | |
38 | (((type) << ARM_SMCCC_TYPE_SHIFT) | \ | |
39 | ((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \ | |
40 | (((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \ | |
41 | ((func_num) & ARM_SMCCC_FUNC_MASK)) | |
42 | ||
43 | #define ARM_SMCCC_OWNER_ARCH 0 | |
44 | #define ARM_SMCCC_OWNER_CPU 1 | |
45 | #define ARM_SMCCC_OWNER_SIP 2 | |
46 | #define ARM_SMCCC_OWNER_OEM 3 | |
47 | #define ARM_SMCCC_OWNER_STANDARD 4 | |
48 | #define ARM_SMCCC_OWNER_STANDARD_HYP 5 | |
49 | #define ARM_SMCCC_OWNER_TRUSTED_APP 48 | |
50 | #define ARM_SMCCC_OWNER_TRUSTED_APP_END 49 | |
51 | #define ARM_SMCCC_OWNER_TRUSTED_OS 50 | |
52 | #define ARM_SMCCC_OWNER_TRUSTED_OS_END 63 | |
53 | ||
54 | #define ARM_SMCCC_QUIRK_NONE 0 | |
55 | #define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */ | |
56 | ||
57 | #define ARM_SMCCC_VERSION_1_0 0x10000 | |
58 | #define ARM_SMCCC_VERSION_1_1 0x10001 | |
59 | ||
60 | #define ARM_SMCCC_VERSION_FUNC_ID \ | |
61 | ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ | |
62 | ARM_SMCCC_SMC_32, \ | |
63 | 0, 0) | |
64 | ||
65 | #define ARM_SMCCC_ARCH_FEATURES_FUNC_ID \ | |
66 | ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ | |
67 | ARM_SMCCC_SMC_32, \ | |
68 | 0, 1) | |
69 | ||
70 | #define ARM_SMCCC_ARCH_WORKAROUND_1 \ | |
71 | ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ | |
72 | ARM_SMCCC_SMC_32, \ | |
73 | 0, 0x8000) | |
74 | ||
75 | #define ARM_SMCCC_ARCH_WORKAROUND_2 \ | |
76 | ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ | |
77 | ARM_SMCCC_SMC_32, \ | |
78 | 0, 0x7fff) | |
79 | ||
80 | #ifndef __ASSEMBLY__ | |
81 | ||
82 | #include <linux/linkage.h> | |
83 | #include <linux/types.h> | |
84 | ||
85 | enum arm_smccc_conduit { | |
86 | SMCCC_CONDUIT_NONE, | |
87 | SMCCC_CONDUIT_SMC, | |
88 | SMCCC_CONDUIT_HVC, | |
89 | }; | |
90 | ||
91 | /** | |
92 | * arm_smccc_1_1_get_conduit() | |
93 | * | |
94 | * Returns the conduit to be used for SMCCCv1.1 or later. | |
95 | * | |
96 | * When SMCCCv1.1 is not present, returns SMCCC_CONDUIT_NONE. | |
97 | */ | |
98 | enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void); | |
99 | ||
100 | /** | |
101 | * struct arm_smccc_res - Result from SMC/HVC call | |
102 | * @a0-a3 result values from registers 0 to 3 | |
103 | */ | |
104 | struct arm_smccc_res { | |
105 | unsigned long a0; | |
106 | unsigned long a1; | |
107 | unsigned long a2; | |
108 | unsigned long a3; | |
109 | }; | |
110 | ||
111 | /** | |
112 | * struct arm_smccc_quirk - Contains quirk information | |
113 | * @id: quirk identification | |
114 | * @state: quirk specific information | |
115 | * @a6: Qualcomm quirk entry for returning post-smc call contents of a6 | |
116 | */ | |
117 | struct arm_smccc_quirk { | |
118 | int id; | |
119 | union { | |
120 | unsigned long a6; | |
121 | } state; | |
122 | }; | |
123 | ||
124 | /** | |
125 | * __arm_smccc_smc() - make SMC calls | |
126 | * @a0-a7: arguments passed in registers 0 to 7 | |
127 | * @res: result values from registers 0 to 3 | |
128 | * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. | |
129 | * | |
130 | * This function is used to make SMC calls following SMC Calling Convention. | |
131 | * The content of the supplied param are copied to registers 0 to 7 prior | |
132 | * to the SMC instruction. The return values are updated with the content | |
133 | * from register 0 to 3 on return from the SMC instruction. An optional | |
134 | * quirk structure provides vendor specific behavior. | |
135 | */ | |
136 | asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1, | |
137 | unsigned long a2, unsigned long a3, unsigned long a4, | |
138 | unsigned long a5, unsigned long a6, unsigned long a7, | |
139 | struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); | |
140 | ||
141 | /** | |
142 | * __arm_smccc_hvc() - make HVC calls | |
143 | * @a0-a7: arguments passed in registers 0 to 7 | |
144 | * @res: result values from registers 0 to 3 | |
145 | * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. | |
146 | * | |
147 | * This function is used to make HVC calls following SMC Calling | |
148 | * Convention. The content of the supplied param are copied to registers 0 | |
149 | * to 7 prior to the HVC instruction. The return values are updated with | |
150 | * the content from register 0 to 3 on return from the HVC instruction. An | |
151 | * optional quirk structure provides vendor specific behavior. | |
152 | */ | |
153 | asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1, | |
154 | unsigned long a2, unsigned long a3, unsigned long a4, | |
155 | unsigned long a5, unsigned long a6, unsigned long a7, | |
156 | struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); | |
157 | ||
158 | #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL) | |
159 | ||
160 | #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__) | |
161 | ||
162 | #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL) | |
163 | ||
164 | #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__) | |
165 | ||
166 | /* SMCCC v1.1 implementation madness follows */ | |
167 | #ifdef CONFIG_ARM64 | |
168 | ||
169 | #define SMCCC_SMC_INST "smc #0" | |
170 | #define SMCCC_HVC_INST "hvc #0" | |
171 | ||
172 | #elif defined(CONFIG_ARM) | |
173 | #include <asm/opcodes-sec.h> | |
174 | #include <asm/opcodes-virt.h> | |
175 | ||
176 | #define SMCCC_SMC_INST __SMC(0) | |
177 | #define SMCCC_HVC_INST __HVC(0) | |
178 | ||
179 | #endif | |
180 | ||
181 | #define ___count_args(_0, _1, _2, _3, _4, _5, _6, _7, _8, x, ...) x | |
182 | ||
183 | #define __count_args(...) \ | |
184 | ___count_args(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0) | |
185 | ||
186 | #define __constraint_write_0 \ | |
187 | "+r" (r0), "=&r" (r1), "=&r" (r2), "=&r" (r3) | |
188 | #define __constraint_write_1 \ | |
189 | "+r" (r0), "+r" (r1), "=&r" (r2), "=&r" (r3) | |
190 | #define __constraint_write_2 \ | |
191 | "+r" (r0), "+r" (r1), "+r" (r2), "=&r" (r3) | |
192 | #define __constraint_write_3 \ | |
193 | "+r" (r0), "+r" (r1), "+r" (r2), "+r" (r3) | |
194 | #define __constraint_write_4 __constraint_write_3 | |
195 | #define __constraint_write_5 __constraint_write_4 | |
196 | #define __constraint_write_6 __constraint_write_5 | |
197 | #define __constraint_write_7 __constraint_write_6 | |
198 | ||
199 | #define __constraint_read_0 | |
200 | #define __constraint_read_1 | |
201 | #define __constraint_read_2 | |
202 | #define __constraint_read_3 | |
203 | #define __constraint_read_4 "r" (r4) | |
204 | #define __constraint_read_5 __constraint_read_4, "r" (r5) | |
205 | #define __constraint_read_6 __constraint_read_5, "r" (r6) | |
206 | #define __constraint_read_7 __constraint_read_6, "r" (r7) | |
207 | ||
208 | #define __declare_arg_0(a0, res) \ | |
209 | struct arm_smccc_res *___res = res; \ | |
210 | register unsigned long r0 asm("r0") = (u32)a0; \ | |
211 | register unsigned long r1 asm("r1"); \ | |
212 | register unsigned long r2 asm("r2"); \ | |
213 | register unsigned long r3 asm("r3") | |
214 | ||
215 | #define __declare_arg_1(a0, a1, res) \ | |
216 | typeof(a1) __a1 = a1; \ | |
217 | struct arm_smccc_res *___res = res; \ | |
218 | register unsigned long r0 asm("r0") = (u32)a0; \ | |
219 | register unsigned long r1 asm("r1") = __a1; \ | |
220 | register unsigned long r2 asm("r2"); \ | |
221 | register unsigned long r3 asm("r3") | |
222 | ||
223 | #define __declare_arg_2(a0, a1, a2, res) \ | |
224 | typeof(a1) __a1 = a1; \ | |
225 | typeof(a2) __a2 = a2; \ | |
226 | struct arm_smccc_res *___res = res; \ | |
227 | register unsigned long r0 asm("r0") = (u32)a0; \ | |
228 | register unsigned long r1 asm("r1") = __a1; \ | |
229 | register unsigned long r2 asm("r2") = __a2; \ | |
230 | register unsigned long r3 asm("r3") | |
231 | ||
232 | #define __declare_arg_3(a0, a1, a2, a3, res) \ | |
233 | typeof(a1) __a1 = a1; \ | |
234 | typeof(a2) __a2 = a2; \ | |
235 | typeof(a3) __a3 = a3; \ | |
236 | struct arm_smccc_res *___res = res; \ | |
237 | register unsigned long r0 asm("r0") = (u32)a0; \ | |
238 | register unsigned long r1 asm("r1") = __a1; \ | |
239 | register unsigned long r2 asm("r2") = __a2; \ | |
240 | register unsigned long r3 asm("r3") = __a3 | |
241 | ||
242 | #define __declare_arg_4(a0, a1, a2, a3, a4, res) \ | |
243 | typeof(a4) __a4 = a4; \ | |
244 | __declare_arg_3(a0, a1, a2, a3, res); \ | |
245 | register unsigned long r4 asm("r4") = __a4 | |
246 | ||
247 | #define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \ | |
248 | typeof(a5) __a5 = a5; \ | |
249 | __declare_arg_4(a0, a1, a2, a3, a4, res); \ | |
250 | register unsigned long r5 asm("r5") = __a5 | |
251 | ||
252 | #define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \ | |
253 | typeof(a6) __a6 = a6; \ | |
254 | __declare_arg_5(a0, a1, a2, a3, a4, a5, res); \ | |
255 | register unsigned long r6 asm("r6") = __a6 | |
256 | ||
257 | #define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \ | |
258 | typeof(a7) __a7 = a7; \ | |
259 | __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \ | |
260 | register unsigned long r7 asm("r7") = __a7 | |
261 | ||
262 | #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__) | |
263 | #define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__) | |
264 | ||
265 | #define ___constraints(count) \ | |
266 | : __constraint_write_ ## count \ | |
267 | : __constraint_read_ ## count \ | |
268 | : "memory" | |
269 | #define __constraints(count) ___constraints(count) | |
270 | ||
271 | /* | |
272 | * We have an output list that is not necessarily used, and GCC feels | |
273 | * entitled to optimise the whole sequence away. "volatile" is what | |
274 | * makes it stick. | |
275 | */ | |
276 | #define __arm_smccc_1_1(inst, ...) \ | |
277 | do { \ | |
278 | __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \ | |
279 | asm volatile(inst "\n" \ | |
280 | __constraints(__count_args(__VA_ARGS__))); \ | |
281 | if (___res) \ | |
282 | *___res = (typeof(*___res)){r0, r1, r2, r3}; \ | |
283 | } while (0) | |
284 | ||
285 | /* | |
286 | * arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call | |
287 | * | |
288 | * This is a variadic macro taking one to eight source arguments, and | |
289 | * an optional return structure. | |
290 | * | |
291 | * @a0-a7: arguments passed in registers 0 to 7 | |
292 | * @res: result values from registers 0 to 3 | |
293 | * | |
294 | * This macro is used to make SMC calls following SMC Calling Convention v1.1. | |
295 | * The content of the supplied param are copied to registers 0 to 7 prior | |
296 | * to the SMC instruction. The return values are updated with the content | |
297 | * from register 0 to 3 on return from the SMC instruction if not NULL. | |
298 | */ | |
299 | #define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__) | |
300 | ||
301 | /* | |
302 | * arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call | |
303 | * | |
304 | * This is a variadic macro taking one to eight source arguments, and | |
305 | * an optional return structure. | |
306 | * | |
307 | * @a0-a7: arguments passed in registers 0 to 7 | |
308 | * @res: result values from registers 0 to 3 | |
309 | * | |
310 | * This macro is used to make HVC calls following SMC Calling Convention v1.1. | |
311 | * The content of the supplied param are copied to registers 0 to 7 prior | |
312 | * to the HVC instruction. The return values are updated with the content | |
313 | * from register 0 to 3 on return from the HVC instruction if not NULL. | |
314 | */ | |
315 | #define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__) | |
316 | ||
317 | /* Return codes defined in ARM DEN 0070A */ | |
318 | #define SMCCC_RET_SUCCESS 0 | |
319 | #define SMCCC_RET_NOT_SUPPORTED -1 | |
320 | #define SMCCC_RET_NOT_REQUIRED -2 | |
321 | ||
322 | /* | |
323 | * Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED. | |
324 | * Used when the SMCCC conduit is not defined. The empty asm statement | |
325 | * avoids compiler warnings about unused variables. | |
326 | */ | |
327 | #define __fail_smccc_1_1(...) \ | |
328 | do { \ | |
329 | __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \ | |
330 | asm ("" __constraints(__count_args(__VA_ARGS__))); \ | |
331 | if (___res) \ | |
332 | ___res->a0 = SMCCC_RET_NOT_SUPPORTED; \ | |
333 | } while (0) | |
334 | ||
335 | /* | |
336 | * arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call | |
337 | * | |
338 | * This is a variadic macro taking one to eight source arguments, and | |
339 | * an optional return structure. | |
340 | * | |
341 | * @a0-a7: arguments passed in registers 0 to 7 | |
342 | * @res: result values from registers 0 to 3 | |
343 | * | |
344 | * This macro will make either an HVC call or an SMC call depending on the | |
345 | * current SMCCC conduit. If no valid conduit is available then -1 | |
346 | * (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied). | |
347 | * | |
348 | * The return value also provides the conduit that was used. | |
349 | */ | |
350 | #define arm_smccc_1_1_invoke(...) ({ \ | |
351 | int method = arm_smccc_1_1_get_conduit(); \ | |
352 | switch (method) { \ | |
353 | case SMCCC_CONDUIT_HVC: \ | |
354 | arm_smccc_1_1_hvc(__VA_ARGS__); \ | |
355 | break; \ | |
356 | case SMCCC_CONDUIT_SMC: \ | |
357 | arm_smccc_1_1_smc(__VA_ARGS__); \ | |
358 | break; \ | |
359 | default: \ | |
360 | __fail_smccc_1_1(__VA_ARGS__); \ | |
361 | method = SMCCC_CONDUIT_NONE; \ | |
362 | break; \ | |
363 | } \ | |
364 | method; \ | |
365 | }) | |
366 | ||
367 | /* Paravirtualised time calls (defined by ARM DEN0057A) */ | |
368 | #define ARM_SMCCC_HV_PV_TIME_FEATURES \ | |
369 | ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ | |
370 | ARM_SMCCC_SMC_64, \ | |
371 | ARM_SMCCC_OWNER_STANDARD_HYP, \ | |
372 | 0x20) | |
373 | ||
374 | #define ARM_SMCCC_HV_PV_TIME_ST \ | |
375 | ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ | |
376 | ARM_SMCCC_SMC_64, \ | |
377 | ARM_SMCCC_OWNER_STANDARD_HYP, \ | |
378 | 0x21) | |
379 | ||
380 | #endif /*__ASSEMBLY__*/ | |
381 | #endif /*__LINUX_ARM_SMCCC_H*/ |