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 <linux/args.h>
9 #include <linux/init.h>
10 #include <uapi/linux/const.h>
11
12 /*
13 * This file provides common defines for ARM SMC Calling Convention as
14 * specified in
15 * https://developer.arm.com/docs/den0028/latest
16 *
17 * This code is up-to-date with version DEN 0028 C
18 */
19
20 #define ARM_SMCCC_STD_CALL _AC(0,U)
21 #define ARM_SMCCC_FAST_CALL _AC(1,U)
22 #define ARM_SMCCC_TYPE_SHIFT 31
23
24 #define ARM_SMCCC_SMC_32 0
25 #define ARM_SMCCC_SMC_64 1
26 #define ARM_SMCCC_CALL_CONV_SHIFT 30
27
28 #define ARM_SMCCC_OWNER_MASK 0x3F
29 #define ARM_SMCCC_OWNER_SHIFT 24
30
31 #define ARM_SMCCC_FUNC_MASK 0xFFFF
32
33 #define ARM_SMCCC_IS_FAST_CALL(smc_val) \
34 ((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT))
35 #define ARM_SMCCC_IS_64(smc_val) \
36 ((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT))
37 #define ARM_SMCCC_FUNC_NUM(smc_val) ((smc_val) & ARM_SMCCC_FUNC_MASK)
38 #define ARM_SMCCC_OWNER_NUM(smc_val) \
39 (((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK)
40
41 #define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \
42 (((type) << ARM_SMCCC_TYPE_SHIFT) | \
43 ((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \
44 (((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \
45 ((func_num) & ARM_SMCCC_FUNC_MASK))
46
47 #define ARM_SMCCC_OWNER_ARCH 0
48 #define ARM_SMCCC_OWNER_CPU 1
49 #define ARM_SMCCC_OWNER_SIP 2
50 #define ARM_SMCCC_OWNER_OEM 3
51 #define ARM_SMCCC_OWNER_STANDARD 4
52 #define ARM_SMCCC_OWNER_STANDARD_HYP 5
53 #define ARM_SMCCC_OWNER_VENDOR_HYP 6
54 #define ARM_SMCCC_OWNER_TRUSTED_APP 48
55 #define ARM_SMCCC_OWNER_TRUSTED_APP_END 49
56 #define ARM_SMCCC_OWNER_TRUSTED_OS 50
57 #define ARM_SMCCC_OWNER_TRUSTED_OS_END 63
58
59 #define ARM_SMCCC_FUNC_QUERY_CALL_UID 0xff01
60
61 #define ARM_SMCCC_QUIRK_NONE 0
62 #define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */
63
64 #define ARM_SMCCC_VERSION_1_0 0x10000
65 #define ARM_SMCCC_VERSION_1_1 0x10001
66 #define ARM_SMCCC_VERSION_1_2 0x10002
67 #define ARM_SMCCC_VERSION_1_3 0x10003
68
69 #define ARM_SMCCC_1_3_SVE_HINT 0x10000
70 #define ARM_SMCCC_CALL_HINTS ARM_SMCCC_1_3_SVE_HINT
71
72
73 #define ARM_SMCCC_VERSION_FUNC_ID \
74 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
75 ARM_SMCCC_SMC_32, \
76 0, 0)
77
78 #define ARM_SMCCC_ARCH_FEATURES_FUNC_ID \
79 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
80 ARM_SMCCC_SMC_32, \
81 0, 1)
82
83 #define ARM_SMCCC_ARCH_SOC_ID \
84 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
85 ARM_SMCCC_SMC_32, \
86 0, 2)
87
88 #define ARM_SMCCC_ARCH_WORKAROUND_1 \
89 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
90 ARM_SMCCC_SMC_32, \
91 0, 0x8000)
92
93 #define ARM_SMCCC_ARCH_WORKAROUND_2 \
94 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
95 ARM_SMCCC_SMC_32, \
96 0, 0x7fff)
97
98 #define ARM_SMCCC_ARCH_WORKAROUND_3 \
99 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
100 ARM_SMCCC_SMC_32, \
101 0, 0x3fff)
102
103 #define ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID \
104 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
105 ARM_SMCCC_SMC_32, \
106 ARM_SMCCC_OWNER_VENDOR_HYP, \
107 ARM_SMCCC_FUNC_QUERY_CALL_UID)
108
109 /* KVM UID value: 28b46fb6-2ec5-11e9-a9ca-4b564d003a74 */
110 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 0xb66fb428U
111 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 0xe911c52eU
112 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 0x564bcaa9U
113 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3 0x743a004dU
114
115 /* KVM "vendor specific" services */
116 #define ARM_SMCCC_KVM_FUNC_FEATURES 0
117 #define ARM_SMCCC_KVM_FUNC_PTP 1
118 #define ARM_SMCCC_KVM_FUNC_FEATURES_2 127
119 #define ARM_SMCCC_KVM_NUM_FUNCS 128
120
121 #define ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID \
122 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
123 ARM_SMCCC_SMC_32, \
124 ARM_SMCCC_OWNER_VENDOR_HYP, \
125 ARM_SMCCC_KVM_FUNC_FEATURES)
126
127 #define SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED 1
128
129 /*
130 * ptp_kvm is a feature used for time sync between vm and host.
131 * ptp_kvm module in guest kernel will get service from host using
132 * this hypercall ID.
133 */
134 #define ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID \
135 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
136 ARM_SMCCC_SMC_32, \
137 ARM_SMCCC_OWNER_VENDOR_HYP, \
138 ARM_SMCCC_KVM_FUNC_PTP)
139
140 /* ptp_kvm counter type ID */
141 #define KVM_PTP_VIRT_COUNTER 0
142 #define KVM_PTP_PHYS_COUNTER 1
143
144 /* Paravirtualised time calls (defined by ARM DEN0057A) */
145 #define ARM_SMCCC_HV_PV_TIME_FEATURES \
146 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
147 ARM_SMCCC_SMC_64, \
148 ARM_SMCCC_OWNER_STANDARD_HYP, \
149 0x20)
150
151 #define ARM_SMCCC_HV_PV_TIME_ST \
152 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
153 ARM_SMCCC_SMC_64, \
154 ARM_SMCCC_OWNER_STANDARD_HYP, \
155 0x21)
156
157 /* TRNG entropy source calls (defined by ARM DEN0098) */
158 #define ARM_SMCCC_TRNG_VERSION \
159 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
160 ARM_SMCCC_SMC_32, \
161 ARM_SMCCC_OWNER_STANDARD, \
162 0x50)
163
164 #define ARM_SMCCC_TRNG_FEATURES \
165 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
166 ARM_SMCCC_SMC_32, \
167 ARM_SMCCC_OWNER_STANDARD, \
168 0x51)
169
170 #define ARM_SMCCC_TRNG_GET_UUID \
171 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
172 ARM_SMCCC_SMC_32, \
173 ARM_SMCCC_OWNER_STANDARD, \
174 0x52)
175
176 #define ARM_SMCCC_TRNG_RND32 \
177 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
178 ARM_SMCCC_SMC_32, \
179 ARM_SMCCC_OWNER_STANDARD, \
180 0x53)
181
182 #define ARM_SMCCC_TRNG_RND64 \
183 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
184 ARM_SMCCC_SMC_64, \
185 ARM_SMCCC_OWNER_STANDARD, \
186 0x53)
187
188 /*
189 * Return codes defined in ARM DEN 0070A
190 * ARM DEN 0070A is now merged/consolidated into ARM DEN 0028 C
191 */
192 #define SMCCC_RET_SUCCESS 0
193 #define SMCCC_RET_NOT_SUPPORTED -1
194 #define SMCCC_RET_NOT_REQUIRED -2
195 #define SMCCC_RET_INVALID_PARAMETER -3
196
197 #ifndef __ASSEMBLY__
198
199 #include <linux/linkage.h>
200 #include <linux/types.h>
201
202 enum arm_smccc_conduit {
203 SMCCC_CONDUIT_NONE,
204 SMCCC_CONDUIT_SMC,
205 SMCCC_CONDUIT_HVC,
206 };
207
208 /**
209 * arm_smccc_1_1_get_conduit()
210 *
211 * Returns the conduit to be used for SMCCCv1.1 or later.
212 *
213 * When SMCCCv1.1 is not present, returns SMCCC_CONDUIT_NONE.
214 */
215 enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);
216
217 /**
218 * arm_smccc_get_version()
219 *
220 * Returns the version to be used for SMCCCv1.1 or later.
221 *
222 * When SMCCCv1.1 or above is not present, returns SMCCCv1.0, but this
223 * does not imply the presence of firmware or a valid conduit. Caller
224 * handling SMCCCv1.0 must determine the conduit by other means.
225 */
226 u32 arm_smccc_get_version(void);
227
228 void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit);
229
230 /**
231 * arm_smccc_get_soc_id_version()
232 *
233 * Returns the SOC ID version.
234 *
235 * When ARM_SMCCC_ARCH_SOC_ID is not present, returns SMCCC_RET_NOT_SUPPORTED.
236 */
237 s32 arm_smccc_get_soc_id_version(void);
238
239 /**
240 * arm_smccc_get_soc_id_revision()
241 *
242 * Returns the SOC ID revision.
243 *
244 * When ARM_SMCCC_ARCH_SOC_ID is not present, returns SMCCC_RET_NOT_SUPPORTED.
245 */
246 s32 arm_smccc_get_soc_id_revision(void);
247
248 /**
249 * struct arm_smccc_res - Result from SMC/HVC call
250 * @a0-a3 result values from registers 0 to 3
251 */
252 struct arm_smccc_res {
253 unsigned long a0;
254 unsigned long a1;
255 unsigned long a2;
256 unsigned long a3;
257 };
258
259 #ifdef CONFIG_ARM64
260 /**
261 * struct arm_smccc_1_2_regs - Arguments for or Results from SMC/HVC call
262 * @a0-a17 argument values from registers 0 to 17
263 */
264 struct arm_smccc_1_2_regs {
265 unsigned long a0;
266 unsigned long a1;
267 unsigned long a2;
268 unsigned long a3;
269 unsigned long a4;
270 unsigned long a5;
271 unsigned long a6;
272 unsigned long a7;
273 unsigned long a8;
274 unsigned long a9;
275 unsigned long a10;
276 unsigned long a11;
277 unsigned long a12;
278 unsigned long a13;
279 unsigned long a14;
280 unsigned long a15;
281 unsigned long a16;
282 unsigned long a17;
283 };
284
285 /**
286 * arm_smccc_1_2_hvc() - make HVC calls
287 * @args: arguments passed via struct arm_smccc_1_2_regs
288 * @res: result values via struct arm_smccc_1_2_regs
289 *
290 * This function is used to make HVC calls following SMC Calling Convention
291 * v1.2 or above. The content of the supplied param are copied from the
292 * structure to registers prior to the HVC instruction. The return values
293 * are updated with the content from registers on return from the HVC
294 * instruction.
295 */
296 asmlinkage void arm_smccc_1_2_hvc(const struct arm_smccc_1_2_regs *args,
297 struct arm_smccc_1_2_regs *res);
298
299 /**
300 * arm_smccc_1_2_smc() - make SMC calls
301 * @args: arguments passed via struct arm_smccc_1_2_regs
302 * @res: result values via struct arm_smccc_1_2_regs
303 *
304 * This function is used to make SMC calls following SMC Calling Convention
305 * v1.2 or above. The content of the supplied param are copied from the
306 * structure to registers prior to the SMC instruction. The return values
307 * are updated with the content from registers on return from the SMC
308 * instruction.
309 */
310 asmlinkage void arm_smccc_1_2_smc(const struct arm_smccc_1_2_regs *args,
311 struct arm_smccc_1_2_regs *res);
312 #endif
313
314 /**
315 * struct arm_smccc_quirk - Contains quirk information
316 * @id: quirk identification
317 * @state: quirk specific information
318 * @a6: Qualcomm quirk entry for returning post-smc call contents of a6
319 */
320 struct arm_smccc_quirk {
321 int id;
322 union {
323 unsigned long a6;
324 } state;
325 };
326
327 /**
328 * __arm_smccc_smc() - make SMC calls
329 * @a0-a7: arguments passed in registers 0 to 7
330 * @res: result values from registers 0 to 3
331 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
332 *
333 * This function is used to make SMC calls following SMC Calling Convention.
334 * The content of the supplied param are copied to registers 0 to 7 prior
335 * to the SMC instruction. The return values are updated with the content
336 * from register 0 to 3 on return from the SMC instruction. An optional
337 * quirk structure provides vendor specific behavior.
338 */
339 #ifdef CONFIG_HAVE_ARM_SMCCC
340 asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1,
341 unsigned long a2, unsigned long a3, unsigned long a4,
342 unsigned long a5, unsigned long a6, unsigned long a7,
343 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
344 #else
__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)345 static inline void __arm_smccc_smc(unsigned long a0, unsigned long a1,
346 unsigned long a2, unsigned long a3, unsigned long a4,
347 unsigned long a5, unsigned long a6, unsigned long a7,
348 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk)
349 {
350 *res = (struct arm_smccc_res){};
351 }
352 #endif
353
354 /**
355 * __arm_smccc_hvc() - make HVC calls
356 * @a0-a7: arguments passed in registers 0 to 7
357 * @res: result values from registers 0 to 3
358 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
359 *
360 * This function is used to make HVC calls following SMC Calling
361 * Convention. The content of the supplied param are copied to registers 0
362 * to 7 prior to the HVC instruction. The return values are updated with
363 * the content from register 0 to 3 on return from the HVC instruction. An
364 * optional quirk structure provides vendor specific behavior.
365 */
366 asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
367 unsigned long a2, unsigned long a3, unsigned long a4,
368 unsigned long a5, unsigned long a6, unsigned long a7,
369 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
370
371 #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)
372
373 #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__)
374
375 #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL)
376
377 #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__)
378
379 /* SMCCC v1.1 implementation madness follows */
380 #ifdef CONFIG_ARM64
381
382 #define SMCCC_SMC_INST "smc #0"
383 #define SMCCC_HVC_INST "hvc #0"
384
385 #elif defined(CONFIG_ARM)
386 #include <asm/opcodes-sec.h>
387 #include <asm/opcodes-virt.h>
388
389 #define SMCCC_SMC_INST __SMC(0)
390 #define SMCCC_HVC_INST __HVC(0)
391
392 #endif
393
394 #define __constraint_read_2 "r" (arg0)
395 #define __constraint_read_3 __constraint_read_2, "r" (arg1)
396 #define __constraint_read_4 __constraint_read_3, "r" (arg2)
397 #define __constraint_read_5 __constraint_read_4, "r" (arg3)
398 #define __constraint_read_6 __constraint_read_5, "r" (arg4)
399 #define __constraint_read_7 __constraint_read_6, "r" (arg5)
400 #define __constraint_read_8 __constraint_read_7, "r" (arg6)
401 #define __constraint_read_9 __constraint_read_8, "r" (arg7)
402
403 #define __declare_arg_2(a0, res) \
404 struct arm_smccc_res *___res = res; \
405 register unsigned long arg0 asm("r0") = (u32)a0
406
407 #define __declare_arg_3(a0, a1, res) \
408 typeof(a1) __a1 = a1; \
409 struct arm_smccc_res *___res = res; \
410 register unsigned long arg0 asm("r0") = (u32)a0; \
411 register typeof(a1) arg1 asm("r1") = __a1
412
413 #define __declare_arg_4(a0, a1, a2, res) \
414 typeof(a1) __a1 = a1; \
415 typeof(a2) __a2 = a2; \
416 struct arm_smccc_res *___res = res; \
417 register unsigned long arg0 asm("r0") = (u32)a0; \
418 register typeof(a1) arg1 asm("r1") = __a1; \
419 register typeof(a2) arg2 asm("r2") = __a2
420
421 #define __declare_arg_5(a0, a1, a2, a3, res) \
422 typeof(a1) __a1 = a1; \
423 typeof(a2) __a2 = a2; \
424 typeof(a3) __a3 = a3; \
425 struct arm_smccc_res *___res = res; \
426 register unsigned long arg0 asm("r0") = (u32)a0; \
427 register typeof(a1) arg1 asm("r1") = __a1; \
428 register typeof(a2) arg2 asm("r2") = __a2; \
429 register typeof(a3) arg3 asm("r3") = __a3
430
431 #define __declare_arg_6(a0, a1, a2, a3, a4, res) \
432 typeof(a4) __a4 = a4; \
433 __declare_arg_5(a0, a1, a2, a3, res); \
434 register typeof(a4) arg4 asm("r4") = __a4
435
436 #define __declare_arg_7(a0, a1, a2, a3, a4, a5, res) \
437 typeof(a5) __a5 = a5; \
438 __declare_arg_6(a0, a1, a2, a3, a4, res); \
439 register typeof(a5) arg5 asm("r5") = __a5
440
441 #define __declare_arg_8(a0, a1, a2, a3, a4, a5, a6, res) \
442 typeof(a6) __a6 = a6; \
443 __declare_arg_7(a0, a1, a2, a3, a4, a5, res); \
444 register typeof(a6) arg6 asm("r6") = __a6
445
446 #define __declare_arg_9(a0, a1, a2, a3, a4, a5, a6, a7, res) \
447 typeof(a7) __a7 = a7; \
448 __declare_arg_8(a0, a1, a2, a3, a4, a5, a6, res); \
449 register typeof(a7) arg7 asm("r7") = __a7
450
451 /*
452 * We have an output list that is not necessarily used, and GCC feels
453 * entitled to optimise the whole sequence away. "volatile" is what
454 * makes it stick.
455 */
456 #define __arm_smccc_1_1(inst, ...) \
457 do { \
458 register unsigned long r0 asm("r0"); \
459 register unsigned long r1 asm("r1"); \
460 register unsigned long r2 asm("r2"); \
461 register unsigned long r3 asm("r3"); \
462 CONCATENATE(__declare_arg_, \
463 COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__); \
464 asm volatile(inst "\n" : \
465 "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3) \
466 : CONCATENATE(__constraint_read_, \
467 COUNT_ARGS(__VA_ARGS__)) \
468 : "memory"); \
469 if (___res) \
470 *___res = (typeof(*___res)){r0, r1, r2, r3}; \
471 } while (0)
472
473 /*
474 * arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call
475 *
476 * This is a variadic macro taking one to eight source arguments, and
477 * an optional return structure.
478 *
479 * @a0-a7: arguments passed in registers 0 to 7
480 * @res: result values from registers 0 to 3
481 *
482 * This macro is used to make SMC calls following SMC Calling Convention v1.1.
483 * The content of the supplied param are copied to registers 0 to 7 prior
484 * to the SMC instruction. The return values are updated with the content
485 * from register 0 to 3 on return from the SMC instruction if not NULL.
486 */
487 #define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__)
488
489 /*
490 * arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call
491 *
492 * This is a variadic macro taking one to eight source arguments, and
493 * an optional return structure.
494 *
495 * @a0-a7: arguments passed in registers 0 to 7
496 * @res: result values from registers 0 to 3
497 *
498 * This macro is used to make HVC calls following SMC Calling Convention v1.1.
499 * The content of the supplied param are copied to registers 0 to 7 prior
500 * to the HVC instruction. The return values are updated with the content
501 * from register 0 to 3 on return from the HVC instruction if not NULL.
502 */
503 #define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__)
504
505 /*
506 * Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED.
507 * Used when the SMCCC conduit is not defined. The empty asm statement
508 * avoids compiler warnings about unused variables.
509 */
510 #define __fail_smccc_1_1(...) \
511 do { \
512 CONCATENATE(__declare_arg_, \
513 COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__); \
514 asm ("" : \
515 : CONCATENATE(__constraint_read_, \
516 COUNT_ARGS(__VA_ARGS__)) \
517 : "memory"); \
518 if (___res) \
519 ___res->a0 = SMCCC_RET_NOT_SUPPORTED; \
520 } while (0)
521
522 /*
523 * arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call
524 *
525 * This is a variadic macro taking one to eight source arguments, and
526 * an optional return structure.
527 *
528 * @a0-a7: arguments passed in registers 0 to 7
529 * @res: result values from registers 0 to 3
530 *
531 * This macro will make either an HVC call or an SMC call depending on the
532 * current SMCCC conduit. If no valid conduit is available then -1
533 * (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied).
534 *
535 * The return value also provides the conduit that was used.
536 */
537 #define arm_smccc_1_1_invoke(...) ({ \
538 int method = arm_smccc_1_1_get_conduit(); \
539 switch (method) { \
540 case SMCCC_CONDUIT_HVC: \
541 arm_smccc_1_1_hvc(__VA_ARGS__); \
542 break; \
543 case SMCCC_CONDUIT_SMC: \
544 arm_smccc_1_1_smc(__VA_ARGS__); \
545 break; \
546 default: \
547 __fail_smccc_1_1(__VA_ARGS__); \
548 method = SMCCC_CONDUIT_NONE; \
549 break; \
550 } \
551 method; \
552 })
553
554 #endif /*__ASSEMBLY__*/
555 #endif /*__LINUX_ARM_SMCCC_H*/
556