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_ARCH_WORKAROUND_3 \
96 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
97 ARM_SMCCC_SMC_32, \
98 0, 0x3fff)
99
100 #define ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID \
101 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
102 ARM_SMCCC_SMC_32, \
103 ARM_SMCCC_OWNER_VENDOR_HYP, \
104 ARM_SMCCC_FUNC_QUERY_CALL_UID)
105
106 /* KVM UID value: 28b46fb6-2ec5-11e9-a9ca-4b564d003a74 */
107 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 0xb66fb428U
108 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 0xe911c52eU
109 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 0x564bcaa9U
110 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3 0x743a004dU
111
112 /* KVM "vendor specific" services */
113 #define ARM_SMCCC_KVM_FUNC_FEATURES 0
114 #define ARM_SMCCC_KVM_FUNC_PTP 1
115 #define ARM_SMCCC_KVM_FUNC_FEATURES_2 127
116 #define ARM_SMCCC_KVM_NUM_FUNCS 128
117
118 #define ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID \
119 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
120 ARM_SMCCC_SMC_32, \
121 ARM_SMCCC_OWNER_VENDOR_HYP, \
122 ARM_SMCCC_KVM_FUNC_FEATURES)
123
124 #define SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED 1
125
126 /*
127 * ptp_kvm is a feature used for time sync between vm and host.
128 * ptp_kvm module in guest kernel will get service from host using
129 * this hypercall ID.
130 */
131 #define ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID \
132 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
133 ARM_SMCCC_SMC_32, \
134 ARM_SMCCC_OWNER_VENDOR_HYP, \
135 ARM_SMCCC_KVM_FUNC_PTP)
136
137 /* ptp_kvm counter type ID */
138 #define KVM_PTP_VIRT_COUNTER 0
139 #define KVM_PTP_PHYS_COUNTER 1
140
141 /* Paravirtualised time calls (defined by ARM DEN0057A) */
142 #define ARM_SMCCC_HV_PV_TIME_FEATURES \
143 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
144 ARM_SMCCC_SMC_64, \
145 ARM_SMCCC_OWNER_STANDARD_HYP, \
146 0x20)
147
148 #define ARM_SMCCC_HV_PV_TIME_ST \
149 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
150 ARM_SMCCC_SMC_64, \
151 ARM_SMCCC_OWNER_STANDARD_HYP, \
152 0x21)
153
154 /* TRNG entropy source calls (defined by ARM DEN0098) */
155 #define ARM_SMCCC_TRNG_VERSION \
156 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
157 ARM_SMCCC_SMC_32, \
158 ARM_SMCCC_OWNER_STANDARD, \
159 0x50)
160
161 #define ARM_SMCCC_TRNG_FEATURES \
162 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
163 ARM_SMCCC_SMC_32, \
164 ARM_SMCCC_OWNER_STANDARD, \
165 0x51)
166
167 #define ARM_SMCCC_TRNG_GET_UUID \
168 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
169 ARM_SMCCC_SMC_32, \
170 ARM_SMCCC_OWNER_STANDARD, \
171 0x52)
172
173 #define ARM_SMCCC_TRNG_RND32 \
174 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
175 ARM_SMCCC_SMC_32, \
176 ARM_SMCCC_OWNER_STANDARD, \
177 0x53)
178
179 #define ARM_SMCCC_TRNG_RND64 \
180 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
181 ARM_SMCCC_SMC_64, \
182 ARM_SMCCC_OWNER_STANDARD, \
183 0x53)
184
185 /*
186 * Return codes defined in ARM DEN 0070A
187 * ARM DEN 0070A is now merged/consolidated into ARM DEN 0028 C
188 */
189 #define SMCCC_RET_SUCCESS 0
190 #define SMCCC_RET_NOT_SUPPORTED -1
191 #define SMCCC_RET_NOT_REQUIRED -2
192 #define SMCCC_RET_INVALID_PARAMETER -3
193
194 #ifndef __ASSEMBLY__
195
196 #include <linux/linkage.h>
197 #include <linux/types.h>
198
199 enum arm_smccc_conduit {
200 SMCCC_CONDUIT_NONE,
201 SMCCC_CONDUIT_SMC,
202 SMCCC_CONDUIT_HVC,
203 };
204
205 /**
206 * arm_smccc_1_1_get_conduit()
207 *
208 * Returns the conduit to be used for SMCCCv1.1 or later.
209 *
210 * When SMCCCv1.1 is not present, returns SMCCC_CONDUIT_NONE.
211 */
212 enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);
213
214 /**
215 * arm_smccc_get_version()
216 *
217 * Returns the version to be used for SMCCCv1.1 or later.
218 *
219 * When SMCCCv1.1 or above is not present, returns SMCCCv1.0, but this
220 * does not imply the presence of firmware or a valid conduit. Caller
221 * handling SMCCCv1.0 must determine the conduit by other means.
222 */
223 u32 arm_smccc_get_version(void);
224
225 void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit);
226
227 extern u64 smccc_has_sve_hint;
228
229 /**
230 * struct arm_smccc_res - Result from SMC/HVC call
231 * @a0-a3 result values from registers 0 to 3
232 */
233 struct arm_smccc_res {
234 unsigned long a0;
235 unsigned long a1;
236 unsigned long a2;
237 unsigned long a3;
238 };
239
240 #ifdef CONFIG_ARM64
241 /**
242 * struct arm_smccc_1_2_regs - Arguments for or Results from SMC/HVC call
243 * @a0-a17 argument values from registers 0 to 17
244 */
245 struct arm_smccc_1_2_regs {
246 unsigned long a0;
247 unsigned long a1;
248 unsigned long a2;
249 unsigned long a3;
250 unsigned long a4;
251 unsigned long a5;
252 unsigned long a6;
253 unsigned long a7;
254 unsigned long a8;
255 unsigned long a9;
256 unsigned long a10;
257 unsigned long a11;
258 unsigned long a12;
259 unsigned long a13;
260 unsigned long a14;
261 unsigned long a15;
262 unsigned long a16;
263 unsigned long a17;
264 };
265
266 /**
267 * arm_smccc_1_2_hvc() - make HVC calls
268 * @args: arguments passed via struct arm_smccc_1_2_regs
269 * @res: result values via struct arm_smccc_1_2_regs
270 *
271 * This function is used to make HVC calls following SMC Calling Convention
272 * v1.2 or above. The content of the supplied param are copied from the
273 * structure to registers prior to the HVC instruction. The return values
274 * are updated with the content from registers on return from the HVC
275 * instruction.
276 */
277 asmlinkage void arm_smccc_1_2_hvc(const struct arm_smccc_1_2_regs *args,
278 struct arm_smccc_1_2_regs *res);
279
280 /**
281 * arm_smccc_1_2_smc() - make SMC calls
282 * @args: arguments passed via struct arm_smccc_1_2_regs
283 * @res: result values via struct arm_smccc_1_2_regs
284 *
285 * This function is used to make SMC calls following SMC Calling Convention
286 * v1.2 or above. The content of the supplied param are copied from the
287 * structure to registers prior to the SMC instruction. The return values
288 * are updated with the content from registers on return from the SMC
289 * instruction.
290 */
291 asmlinkage void arm_smccc_1_2_smc(const struct arm_smccc_1_2_regs *args,
292 struct arm_smccc_1_2_regs *res);
293 #endif
294
295 /**
296 * struct arm_smccc_quirk - Contains quirk information
297 * @id: quirk identification
298 * @state: quirk specific information
299 * @a6: Qualcomm quirk entry for returning post-smc call contents of a6
300 */
301 struct arm_smccc_quirk {
302 int id;
303 union {
304 unsigned long a6;
305 } state;
306 };
307
308 /**
309 * __arm_smccc_sve_check() - Set the SVE hint bit when doing SMC calls
310 *
311 * Sets the SMCCC hint bit to indicate if there is live state in the SVE
312 * registers, this modifies x0 in place and should never be called from C
313 * code.
314 */
315 asmlinkage unsigned long __arm_smccc_sve_check(unsigned long x0);
316
317 /**
318 * __arm_smccc_smc() - make SMC calls
319 * @a0-a7: arguments passed in registers 0 to 7
320 * @res: result values from registers 0 to 3
321 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
322 *
323 * This function is used to make SMC calls following SMC Calling Convention.
324 * The content of the supplied param are copied to registers 0 to 7 prior
325 * to the SMC instruction. The return values are updated with the content
326 * from register 0 to 3 on return from the SMC instruction. An optional
327 * quirk structure provides vendor specific behavior.
328 */
329 #ifdef CONFIG_HAVE_ARM_SMCCC
330 asmlinkage 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 #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)335 static inline void __arm_smccc_smc(unsigned long a0, unsigned long a1,
336 unsigned long a2, unsigned long a3, unsigned long a4,
337 unsigned long a5, unsigned long a6, unsigned long a7,
338 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk)
339 {
340 *res = (struct arm_smccc_res){};
341 }
342 #endif
343
344 /**
345 * __arm_smccc_hvc() - make HVC calls
346 * @a0-a7: arguments passed in registers 0 to 7
347 * @res: result values from registers 0 to 3
348 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
349 *
350 * This function is used to make HVC calls following SMC Calling
351 * Convention. The content of the supplied param are copied to registers 0
352 * to 7 prior to the HVC instruction. The return values are updated with
353 * the content from register 0 to 3 on return from the HVC instruction. An
354 * optional quirk structure provides vendor specific behavior.
355 */
356 asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
357 unsigned long a2, unsigned long a3, unsigned long a4,
358 unsigned long a5, unsigned long a6, unsigned long a7,
359 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
360
361 #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)
362
363 #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__)
364
365 #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL)
366
367 #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__)
368
369 /* SMCCC v1.1 implementation madness follows */
370 #ifdef CONFIG_ARM64
371
372 #define SMCCC_SMC_INST "smc #0"
373 #define SMCCC_HVC_INST "hvc #0"
374
375 #elif defined(CONFIG_ARM)
376 #include <asm/opcodes-sec.h>
377 #include <asm/opcodes-virt.h>
378
379 #define SMCCC_SMC_INST __SMC(0)
380 #define SMCCC_HVC_INST __HVC(0)
381
382 #endif
383
384 /* nVHE hypervisor doesn't have a current thread so needs separate checks */
385 #if defined(CONFIG_ARM64_SVE) && !defined(__KVM_NVHE_HYPERVISOR__)
386
387 #define SMCCC_SVE_CHECK ALTERNATIVE("nop \n", "bl __arm_smccc_sve_check \n", \
388 ARM64_SVE)
389 #define smccc_sve_clobbers "x16", "x30", "cc",
390
391 #else
392
393 #define SMCCC_SVE_CHECK
394 #define smccc_sve_clobbers
395
396 #endif
397
398 #define ___count_args(_0, _1, _2, _3, _4, _5, _6, _7, _8, x, ...) x
399
400 #define __count_args(...) \
401 ___count_args(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0)
402
403 #define __constraint_read_0 "r" (arg0)
404 #define __constraint_read_1 __constraint_read_0, "r" (arg1)
405 #define __constraint_read_2 __constraint_read_1, "r" (arg2)
406 #define __constraint_read_3 __constraint_read_2, "r" (arg3)
407 #define __constraint_read_4 __constraint_read_3, "r" (arg4)
408 #define __constraint_read_5 __constraint_read_4, "r" (arg5)
409 #define __constraint_read_6 __constraint_read_5, "r" (arg6)
410 #define __constraint_read_7 __constraint_read_6, "r" (arg7)
411
412 #define __declare_arg_0(a0, res) \
413 struct arm_smccc_res *___res = res; \
414 register unsigned long arg0 asm("r0") = (u32)a0
415
416 #define __declare_arg_1(a0, a1, res) \
417 typeof(a1) __a1 = a1; \
418 struct arm_smccc_res *___res = res; \
419 register unsigned long arg0 asm("r0") = (u32)a0; \
420 register typeof(a1) arg1 asm("r1") = __a1
421
422 #define __declare_arg_2(a0, a1, a2, res) \
423 typeof(a1) __a1 = a1; \
424 typeof(a2) __a2 = a2; \
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
430 #define __declare_arg_3(a0, a1, a2, a3, res) \
431 typeof(a1) __a1 = a1; \
432 typeof(a2) __a2 = a2; \
433 typeof(a3) __a3 = a3; \
434 struct arm_smccc_res *___res = res; \
435 register unsigned long arg0 asm("r0") = (u32)a0; \
436 register typeof(a1) arg1 asm("r1") = __a1; \
437 register typeof(a2) arg2 asm("r2") = __a2; \
438 register typeof(a3) arg3 asm("r3") = __a3
439
440 #define __declare_arg_4(a0, a1, a2, a3, a4, res) \
441 typeof(a4) __a4 = a4; \
442 __declare_arg_3(a0, a1, a2, a3, res); \
443 register typeof(a4) arg4 asm("r4") = __a4
444
445 #define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \
446 typeof(a5) __a5 = a5; \
447 __declare_arg_4(a0, a1, a2, a3, a4, res); \
448 register typeof(a5) arg5 asm("r5") = __a5
449
450 #define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \
451 typeof(a6) __a6 = a6; \
452 __declare_arg_5(a0, a1, a2, a3, a4, a5, res); \
453 register typeof(a6) arg6 asm("r6") = __a6
454
455 #define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \
456 typeof(a7) __a7 = a7; \
457 __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \
458 register typeof(a7) arg7 asm("r7") = __a7
459
460 #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__)
461 #define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__)
462
463 #define ___constraints(count) \
464 : __constraint_read_ ## count \
465 : smccc_sve_clobbers "memory"
466 #define __constraints(count) ___constraints(count)
467
468 /*
469 * We have an output list that is not necessarily used, and GCC feels
470 * entitled to optimise the whole sequence away. "volatile" is what
471 * makes it stick.
472 */
473 #define __arm_smccc_1_1(inst, ...) \
474 do { \
475 register unsigned long r0 asm("r0"); \
476 register unsigned long r1 asm("r1"); \
477 register unsigned long r2 asm("r2"); \
478 register unsigned long r3 asm("r3"); \
479 __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
480 asm volatile(SMCCC_SVE_CHECK \
481 inst "\n" : \
482 "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3) \
483 __constraints(__count_args(__VA_ARGS__))); \
484 if (___res) \
485 *___res = (typeof(*___res)){r0, r1, r2, r3}; \
486 } while (0)
487
488 /*
489 * arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call
490 *
491 * This is a variadic macro taking one to eight source arguments, and
492 * an optional return structure.
493 *
494 * @a0-a7: arguments passed in registers 0 to 7
495 * @res: result values from registers 0 to 3
496 *
497 * This macro is used to make SMC calls following SMC Calling Convention v1.1.
498 * The content of the supplied param are copied to registers 0 to 7 prior
499 * to the SMC instruction. The return values are updated with the content
500 * from register 0 to 3 on return from the SMC instruction if not NULL.
501 */
502 #define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__)
503
504 /*
505 * arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call
506 *
507 * This is a variadic macro taking one to eight source arguments, and
508 * an optional return structure.
509 *
510 * @a0-a7: arguments passed in registers 0 to 7
511 * @res: result values from registers 0 to 3
512 *
513 * This macro is used to make HVC calls following SMC Calling Convention v1.1.
514 * The content of the supplied param are copied to registers 0 to 7 prior
515 * to the HVC instruction. The return values are updated with the content
516 * from register 0 to 3 on return from the HVC instruction if not NULL.
517 */
518 #define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__)
519
520 /*
521 * Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED.
522 * Used when the SMCCC conduit is not defined. The empty asm statement
523 * avoids compiler warnings about unused variables.
524 */
525 #define __fail_smccc_1_1(...) \
526 do { \
527 __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
528 asm ("" : __constraints(__count_args(__VA_ARGS__))); \
529 if (___res) \
530 ___res->a0 = SMCCC_RET_NOT_SUPPORTED; \
531 } while (0)
532
533 /*
534 * arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call
535 *
536 * This is a variadic macro taking one to eight source arguments, and
537 * an optional return structure.
538 *
539 * @a0-a7: arguments passed in registers 0 to 7
540 * @res: result values from registers 0 to 3
541 *
542 * This macro will make either an HVC call or an SMC call depending on the
543 * current SMCCC conduit. If no valid conduit is available then -1
544 * (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied).
545 *
546 * The return value also provides the conduit that was used.
547 */
548 #define arm_smccc_1_1_invoke(...) ({ \
549 int method = arm_smccc_1_1_get_conduit(); \
550 switch (method) { \
551 case SMCCC_CONDUIT_HVC: \
552 arm_smccc_1_1_hvc(__VA_ARGS__); \
553 break; \
554 case SMCCC_CONDUIT_SMC: \
555 arm_smccc_1_1_smc(__VA_ARGS__); \
556 break; \
557 default: \
558 __fail_smccc_1_1(__VA_ARGS__); \
559 method = SMCCC_CONDUIT_NONE; \
560 break; \
561 } \
562 method; \
563 })
564
565 #endif /*__ASSEMBLY__*/
566 #endif /*__LINUX_ARM_SMCCC_H*/
567