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/init.h>
9 #include <uapi/linux/const.h>
10
11 /*
12 * This file provides common defines for ARM SMC Calling Convention as
13 * specified in
14 * https://developer.arm.com/docs/den0028/latest
15 *
16 * This code is up-to-date with version DEN 0028 C
17 */
18
19 #define ARM_SMCCC_STD_CALL _AC(0,U)
20 #define ARM_SMCCC_FAST_CALL _AC(1,U)
21 #define ARM_SMCCC_TYPE_SHIFT 31
22
23 #define ARM_SMCCC_SMC_32 0
24 #define ARM_SMCCC_SMC_64 1
25 #define ARM_SMCCC_CALL_CONV_SHIFT 30
26
27 #define ARM_SMCCC_OWNER_MASK 0x3F
28 #define ARM_SMCCC_OWNER_SHIFT 24
29
30 #define ARM_SMCCC_FUNC_MASK 0xFFFF
31
32 #define ARM_SMCCC_IS_FAST_CALL(smc_val) \
33 ((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT))
34 #define ARM_SMCCC_IS_64(smc_val) \
35 ((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT))
36 #define ARM_SMCCC_FUNC_NUM(smc_val) ((smc_val) & ARM_SMCCC_FUNC_MASK)
37 #define ARM_SMCCC_OWNER_NUM(smc_val) \
38 (((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK)
39
40 #define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \
41 (((type) << ARM_SMCCC_TYPE_SHIFT) | \
42 ((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \
43 (((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \
44 ((func_num) & ARM_SMCCC_FUNC_MASK))
45
46 #define ARM_SMCCC_OWNER_ARCH 0
47 #define ARM_SMCCC_OWNER_CPU 1
48 #define ARM_SMCCC_OWNER_SIP 2
49 #define ARM_SMCCC_OWNER_OEM 3
50 #define ARM_SMCCC_OWNER_STANDARD 4
51 #define ARM_SMCCC_OWNER_STANDARD_HYP 5
52 #define ARM_SMCCC_OWNER_VENDOR_HYP 6
53 #define ARM_SMCCC_OWNER_TRUSTED_APP 48
54 #define ARM_SMCCC_OWNER_TRUSTED_APP_END 49
55 #define ARM_SMCCC_OWNER_TRUSTED_OS 50
56 #define ARM_SMCCC_OWNER_TRUSTED_OS_END 63
57
58 #define ARM_SMCCC_FUNC_QUERY_CALL_UID 0xff01
59
60 #define ARM_SMCCC_QUIRK_NONE 0
61 #define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */
62
63 #define ARM_SMCCC_VERSION_1_0 0x10000
64 #define ARM_SMCCC_VERSION_1_1 0x10001
65 #define ARM_SMCCC_VERSION_1_2 0x10002
66 #define ARM_SMCCC_VERSION_1_3 0x10003
67
68 #define ARM_SMCCC_1_3_SVE_HINT 0x10000
69
70 #define ARM_SMCCC_VERSION_FUNC_ID \
71 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
72 ARM_SMCCC_SMC_32, \
73 0, 0)
74
75 #define ARM_SMCCC_ARCH_FEATURES_FUNC_ID \
76 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
77 ARM_SMCCC_SMC_32, \
78 0, 1)
79
80 #define ARM_SMCCC_ARCH_SOC_ID \
81 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
82 ARM_SMCCC_SMC_32, \
83 0, 2)
84
85 #define ARM_SMCCC_ARCH_WORKAROUND_1 \
86 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
87 ARM_SMCCC_SMC_32, \
88 0, 0x8000)
89
90 #define ARM_SMCCC_ARCH_WORKAROUND_2 \
91 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
92 ARM_SMCCC_SMC_32, \
93 0, 0x7fff)
94
95 #define ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID \
96 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
97 ARM_SMCCC_SMC_32, \
98 ARM_SMCCC_OWNER_VENDOR_HYP, \
99 ARM_SMCCC_FUNC_QUERY_CALL_UID)
100
101 /* KVM UID value: 28b46fb6-2ec5-11e9-a9ca-4b564d003a74 */
102 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 0xb66fb428U
103 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 0xe911c52eU
104 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 0x564bcaa9U
105 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3 0x743a004dU
106
107 /* KVM "vendor specific" services */
108 #define ARM_SMCCC_KVM_FUNC_FEATURES 0
109 #define ARM_SMCCC_KVM_FUNC_PTP 1
110 #define ARM_SMCCC_KVM_FUNC_FEATURES_2 127
111 #define ARM_SMCCC_KVM_NUM_FUNCS 128
112
113 #define ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID \
114 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
115 ARM_SMCCC_SMC_32, \
116 ARM_SMCCC_OWNER_VENDOR_HYP, \
117 ARM_SMCCC_KVM_FUNC_FEATURES)
118
119 #define SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED 1
120
121 /*
122 * ptp_kvm is a feature used for time sync between vm and host.
123 * ptp_kvm module in guest kernel will get service from host using
124 * this hypercall ID.
125 */
126 #define ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID \
127 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
128 ARM_SMCCC_SMC_32, \
129 ARM_SMCCC_OWNER_VENDOR_HYP, \
130 ARM_SMCCC_KVM_FUNC_PTP)
131
132 /* ptp_kvm counter type ID */
133 #define KVM_PTP_VIRT_COUNTER 0
134 #define KVM_PTP_PHYS_COUNTER 1
135
136 /* Paravirtualised time calls (defined by ARM DEN0057A) */
137 #define ARM_SMCCC_HV_PV_TIME_FEATURES \
138 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
139 ARM_SMCCC_SMC_64, \
140 ARM_SMCCC_OWNER_STANDARD_HYP, \
141 0x20)
142
143 #define ARM_SMCCC_HV_PV_TIME_ST \
144 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
145 ARM_SMCCC_SMC_64, \
146 ARM_SMCCC_OWNER_STANDARD_HYP, \
147 0x21)
148
149 /* TRNG entropy source calls (defined by ARM DEN0098) */
150 #define ARM_SMCCC_TRNG_VERSION \
151 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
152 ARM_SMCCC_SMC_32, \
153 ARM_SMCCC_OWNER_STANDARD, \
154 0x50)
155
156 #define ARM_SMCCC_TRNG_FEATURES \
157 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
158 ARM_SMCCC_SMC_32, \
159 ARM_SMCCC_OWNER_STANDARD, \
160 0x51)
161
162 #define ARM_SMCCC_TRNG_GET_UUID \
163 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
164 ARM_SMCCC_SMC_32, \
165 ARM_SMCCC_OWNER_STANDARD, \
166 0x52)
167
168 #define ARM_SMCCC_TRNG_RND32 \
169 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
170 ARM_SMCCC_SMC_32, \
171 ARM_SMCCC_OWNER_STANDARD, \
172 0x53)
173
174 #define ARM_SMCCC_TRNG_RND64 \
175 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
176 ARM_SMCCC_SMC_64, \
177 ARM_SMCCC_OWNER_STANDARD, \
178 0x53)
179
180 /*
181 * Return codes defined in ARM DEN 0070A
182 * ARM DEN 0070A is now merged/consolidated into ARM DEN 0028 C
183 */
184 #define SMCCC_RET_SUCCESS 0
185 #define SMCCC_RET_NOT_SUPPORTED -1
186 #define SMCCC_RET_NOT_REQUIRED -2
187 #define SMCCC_RET_INVALID_PARAMETER -3
188
189 #ifndef __ASSEMBLY__
190
191 #include <linux/linkage.h>
192 #include <linux/types.h>
193
194 enum arm_smccc_conduit {
195 SMCCC_CONDUIT_NONE,
196 SMCCC_CONDUIT_SMC,
197 SMCCC_CONDUIT_HVC,
198 };
199
200 /**
201 * arm_smccc_1_1_get_conduit()
202 *
203 * Returns the conduit to be used for SMCCCv1.1 or later.
204 *
205 * When SMCCCv1.1 is not present, returns SMCCC_CONDUIT_NONE.
206 */
207 enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);
208
209 /**
210 * arm_smccc_get_version()
211 *
212 * Returns the version to be used for SMCCCv1.1 or later.
213 *
214 * When SMCCCv1.1 or above is not present, returns SMCCCv1.0, but this
215 * does not imply the presence of firmware or a valid conduit. Caller
216 * handling SMCCCv1.0 must determine the conduit by other means.
217 */
218 u32 arm_smccc_get_version(void);
219
220 void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit);
221
222 extern u64 smccc_has_sve_hint;
223
224 /**
225 * struct arm_smccc_res - Result from SMC/HVC call
226 * @a0-a3 result values from registers 0 to 3
227 */
228 struct arm_smccc_res {
229 unsigned long a0;
230 unsigned long a1;
231 unsigned long a2;
232 unsigned long a3;
233 };
234
235 #ifdef CONFIG_ARM64
236 /**
237 * struct arm_smccc_1_2_regs - Arguments for or Results from SMC/HVC call
238 * @a0-a17 argument values from registers 0 to 17
239 */
240 struct arm_smccc_1_2_regs {
241 unsigned long a0;
242 unsigned long a1;
243 unsigned long a2;
244 unsigned long a3;
245 unsigned long a4;
246 unsigned long a5;
247 unsigned long a6;
248 unsigned long a7;
249 unsigned long a8;
250 unsigned long a9;
251 unsigned long a10;
252 unsigned long a11;
253 unsigned long a12;
254 unsigned long a13;
255 unsigned long a14;
256 unsigned long a15;
257 unsigned long a16;
258 unsigned long a17;
259 };
260
261 /**
262 * arm_smccc_1_2_hvc() - make HVC calls
263 * @args: arguments passed via struct arm_smccc_1_2_regs
264 * @res: result values via struct arm_smccc_1_2_regs
265 *
266 * This function is used to make HVC calls following SMC Calling Convention
267 * v1.2 or above. The content of the supplied param are copied from the
268 * structure to registers prior to the HVC instruction. The return values
269 * are updated with the content from registers on return from the HVC
270 * instruction.
271 */
272 asmlinkage void arm_smccc_1_2_hvc(const struct arm_smccc_1_2_regs *args,
273 struct arm_smccc_1_2_regs *res);
274
275 /**
276 * arm_smccc_1_2_smc() - make SMC calls
277 * @args: arguments passed via struct arm_smccc_1_2_regs
278 * @res: result values via struct arm_smccc_1_2_regs
279 *
280 * This function is used to make SMC calls following SMC Calling Convention
281 * v1.2 or above. The content of the supplied param are copied from the
282 * structure to registers prior to the SMC instruction. The return values
283 * are updated with the content from registers on return from the SMC
284 * instruction.
285 */
286 asmlinkage void arm_smccc_1_2_smc(const struct arm_smccc_1_2_regs *args,
287 struct arm_smccc_1_2_regs *res);
288 #endif
289
290 /**
291 * struct arm_smccc_quirk - Contains quirk information
292 * @id: quirk identification
293 * @state: quirk specific information
294 * @a6: Qualcomm quirk entry for returning post-smc call contents of a6
295 */
296 struct arm_smccc_quirk {
297 int id;
298 union {
299 unsigned long a6;
300 } state;
301 };
302
303 /**
304 * __arm_smccc_sve_check() - Set the SVE hint bit when doing SMC calls
305 *
306 * Sets the SMCCC hint bit to indicate if there is live state in the SVE
307 * registers, this modifies x0 in place and should never be called from C
308 * code.
309 */
310 asmlinkage unsigned long __arm_smccc_sve_check(unsigned long x0);
311
312 /**
313 * __arm_smccc_smc() - make SMC calls
314 * @a0-a7: arguments passed in registers 0 to 7
315 * @res: result values from registers 0 to 3
316 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
317 *
318 * This function is used to make SMC calls following SMC Calling Convention.
319 * The content of the supplied param are copied to registers 0 to 7 prior
320 * to the SMC instruction. The return values are updated with the content
321 * from register 0 to 3 on return from the SMC instruction. An optional
322 * quirk structure provides vendor specific behavior.
323 */
324 #ifdef CONFIG_HAVE_ARM_SMCCC
325 asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1,
326 unsigned long a2, unsigned long a3, unsigned long a4,
327 unsigned long a5, unsigned long a6, unsigned long a7,
328 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
329 #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)330 static inline void __arm_smccc_smc(unsigned long a0, unsigned long a1,
331 unsigned long a2, unsigned long a3, unsigned long a4,
332 unsigned long a5, unsigned long a6, unsigned long a7,
333 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk)
334 {
335 *res = (struct arm_smccc_res){};
336 }
337 #endif
338
339 /**
340 * __arm_smccc_hvc() - make HVC calls
341 * @a0-a7: arguments passed in registers 0 to 7
342 * @res: result values from registers 0 to 3
343 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
344 *
345 * This function is used to make HVC calls following SMC Calling
346 * Convention. The content of the supplied param are copied to registers 0
347 * to 7 prior to the HVC instruction. The return values are updated with
348 * the content from register 0 to 3 on return from the HVC instruction. An
349 * optional quirk structure provides vendor specific behavior.
350 */
351 asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
352 unsigned long a2, unsigned long a3, unsigned long a4,
353 unsigned long a5, unsigned long a6, unsigned long a7,
354 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
355
356 #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)
357
358 #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__)
359
360 #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL)
361
362 #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__)
363
364 /* SMCCC v1.1 implementation madness follows */
365 #ifdef CONFIG_ARM64
366
367 #define SMCCC_SMC_INST "smc #0"
368 #define SMCCC_HVC_INST "hvc #0"
369
370 #elif defined(CONFIG_ARM)
371 #include <asm/opcodes-sec.h>
372 #include <asm/opcodes-virt.h>
373
374 #define SMCCC_SMC_INST __SMC(0)
375 #define SMCCC_HVC_INST __HVC(0)
376
377 #endif
378
379 /* nVHE hypervisor doesn't have a current thread so needs separate checks */
380 #if defined(CONFIG_ARM64_SVE) && !defined(__KVM_NVHE_HYPERVISOR__)
381
382 #define SMCCC_SVE_CHECK ALTERNATIVE("nop \n", "bl __arm_smccc_sve_check \n", \
383 ARM64_SVE)
384 #define smccc_sve_clobbers "x16", "x30", "cc",
385
386 #else
387
388 #define SMCCC_SVE_CHECK
389 #define smccc_sve_clobbers
390
391 #endif
392
393 #define ___count_args(_0, _1, _2, _3, _4, _5, _6, _7, _8, x, ...) x
394
395 #define __count_args(...) \
396 ___count_args(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0)
397
398 #define __constraint_read_0 "r" (arg0)
399 #define __constraint_read_1 __constraint_read_0, "r" (arg1)
400 #define __constraint_read_2 __constraint_read_1, "r" (arg2)
401 #define __constraint_read_3 __constraint_read_2, "r" (arg3)
402 #define __constraint_read_4 __constraint_read_3, "r" (arg4)
403 #define __constraint_read_5 __constraint_read_4, "r" (arg5)
404 #define __constraint_read_6 __constraint_read_5, "r" (arg6)
405 #define __constraint_read_7 __constraint_read_6, "r" (arg7)
406
407 #define __declare_arg_0(a0, res) \
408 struct arm_smccc_res *___res = res; \
409 register unsigned long arg0 asm("r0") = (u32)a0
410
411 #define __declare_arg_1(a0, a1, res) \
412 typeof(a1) __a1 = a1; \
413 struct arm_smccc_res *___res = res; \
414 register unsigned long arg0 asm("r0") = (u32)a0; \
415 register typeof(a1) arg1 asm("r1") = __a1
416
417 #define __declare_arg_2(a0, a1, a2, res) \
418 typeof(a1) __a1 = a1; \
419 typeof(a2) __a2 = a2; \
420 struct arm_smccc_res *___res = res; \
421 register unsigned long arg0 asm("r0") = (u32)a0; \
422 register typeof(a1) arg1 asm("r1") = __a1; \
423 register typeof(a2) arg2 asm("r2") = __a2
424
425 #define __declare_arg_3(a0, a1, a2, a3, res) \
426 typeof(a1) __a1 = a1; \
427 typeof(a2) __a2 = a2; \
428 typeof(a3) __a3 = a3; \
429 struct arm_smccc_res *___res = res; \
430 register unsigned long arg0 asm("r0") = (u32)a0; \
431 register typeof(a1) arg1 asm("r1") = __a1; \
432 register typeof(a2) arg2 asm("r2") = __a2; \
433 register typeof(a3) arg3 asm("r3") = __a3
434
435 #define __declare_arg_4(a0, a1, a2, a3, a4, res) \
436 typeof(a4) __a4 = a4; \
437 __declare_arg_3(a0, a1, a2, a3, res); \
438 register typeof(a4) arg4 asm("r4") = __a4
439
440 #define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \
441 typeof(a5) __a5 = a5; \
442 __declare_arg_4(a0, a1, a2, a3, a4, res); \
443 register typeof(a5) arg5 asm("r5") = __a5
444
445 #define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \
446 typeof(a6) __a6 = a6; \
447 __declare_arg_5(a0, a1, a2, a3, a4, a5, res); \
448 register typeof(a6) arg6 asm("r6") = __a6
449
450 #define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \
451 typeof(a7) __a7 = a7; \
452 __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \
453 register typeof(a7) arg7 asm("r7") = __a7
454
455 #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__)
456 #define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__)
457
458 #define ___constraints(count) \
459 : __constraint_read_ ## count \
460 : smccc_sve_clobbers "memory"
461 #define __constraints(count) ___constraints(count)
462
463 /*
464 * We have an output list that is not necessarily used, and GCC feels
465 * entitled to optimise the whole sequence away. "volatile" is what
466 * makes it stick.
467 */
468 #define __arm_smccc_1_1(inst, ...) \
469 do { \
470 register unsigned long r0 asm("r0"); \
471 register unsigned long r1 asm("r1"); \
472 register unsigned long r2 asm("r2"); \
473 register unsigned long r3 asm("r3"); \
474 __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
475 asm volatile(SMCCC_SVE_CHECK \
476 inst "\n" : \
477 "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3) \
478 __constraints(__count_args(__VA_ARGS__))); \
479 if (___res) \
480 *___res = (typeof(*___res)){r0, r1, r2, r3}; \
481 } while (0)
482
483 /*
484 * arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call
485 *
486 * This is a variadic macro taking one to eight source arguments, and
487 * an optional return structure.
488 *
489 * @a0-a7: arguments passed in registers 0 to 7
490 * @res: result values from registers 0 to 3
491 *
492 * This macro is used to make SMC calls following SMC Calling Convention v1.1.
493 * The content of the supplied param are copied to registers 0 to 7 prior
494 * to the SMC instruction. The return values are updated with the content
495 * from register 0 to 3 on return from the SMC instruction if not NULL.
496 */
497 #define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__)
498
499 /*
500 * arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call
501 *
502 * This is a variadic macro taking one to eight source arguments, and
503 * an optional return structure.
504 *
505 * @a0-a7: arguments passed in registers 0 to 7
506 * @res: result values from registers 0 to 3
507 *
508 * This macro is used to make HVC calls following SMC Calling Convention v1.1.
509 * The content of the supplied param are copied to registers 0 to 7 prior
510 * to the HVC instruction. The return values are updated with the content
511 * from register 0 to 3 on return from the HVC instruction if not NULL.
512 */
513 #define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__)
514
515 /*
516 * Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED.
517 * Used when the SMCCC conduit is not defined. The empty asm statement
518 * avoids compiler warnings about unused variables.
519 */
520 #define __fail_smccc_1_1(...) \
521 do { \
522 __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
523 asm ("" : __constraints(__count_args(__VA_ARGS__))); \
524 if (___res) \
525 ___res->a0 = SMCCC_RET_NOT_SUPPORTED; \
526 } while (0)
527
528 /*
529 * arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call
530 *
531 * This is a variadic macro taking one to eight source arguments, and
532 * an optional return structure.
533 *
534 * @a0-a7: arguments passed in registers 0 to 7
535 * @res: result values from registers 0 to 3
536 *
537 * This macro will make either an HVC call or an SMC call depending on the
538 * current SMCCC conduit. If no valid conduit is available then -1
539 * (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied).
540 *
541 * The return value also provides the conduit that was used.
542 */
543 #define arm_smccc_1_1_invoke(...) ({ \
544 int method = arm_smccc_1_1_get_conduit(); \
545 switch (method) { \
546 case SMCCC_CONDUIT_HVC: \
547 arm_smccc_1_1_hvc(__VA_ARGS__); \
548 break; \
549 case SMCCC_CONDUIT_SMC: \
550 arm_smccc_1_1_smc(__VA_ARGS__); \
551 break; \
552 default: \
553 __fail_smccc_1_1(__VA_ARGS__); \
554 method = SMCCC_CONDUIT_NONE; \
555 break; \
556 } \
557 method; \
558 })
559
560 #endif /*__ASSEMBLY__*/
561 #endif /*__LINUX_ARM_SMCCC_H*/
562