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 | extern u64 smccc_has_sve_hint; |
231 | |
232 | /** |
233 | * arm_smccc_get_soc_id_version() |
234 | * |
235 | * Returns the SOC ID version. |
236 | * |
237 | * When ARM_SMCCC_ARCH_SOC_ID is not present, returns SMCCC_RET_NOT_SUPPORTED. |
238 | */ |
239 | s32 arm_smccc_get_soc_id_version(void); |
240 | |
241 | /** |
242 | * arm_smccc_get_soc_id_revision() |
243 | * |
244 | * Returns the SOC ID revision. |
245 | * |
246 | * When ARM_SMCCC_ARCH_SOC_ID is not present, returns SMCCC_RET_NOT_SUPPORTED. |
247 | */ |
248 | s32 arm_smccc_get_soc_id_revision(void); |
249 | |
250 | /** |
251 | * struct arm_smccc_res - Result from SMC/HVC call |
252 | * @a0-a3 result values from registers 0 to 3 |
253 | */ |
254 | struct arm_smccc_res { |
255 | unsigned long a0; |
256 | unsigned long a1; |
257 | unsigned long a2; |
258 | unsigned long a3; |
259 | }; |
260 | |
261 | #ifdef CONFIG_ARM64 |
262 | /** |
263 | * struct arm_smccc_1_2_regs - Arguments for or Results from SMC/HVC call |
264 | * @a0-a17 argument values from registers 0 to 17 |
265 | */ |
266 | struct arm_smccc_1_2_regs { |
267 | unsigned long a0; |
268 | unsigned long a1; |
269 | unsigned long a2; |
270 | unsigned long a3; |
271 | unsigned long a4; |
272 | unsigned long a5; |
273 | unsigned long a6; |
274 | unsigned long a7; |
275 | unsigned long a8; |
276 | unsigned long a9; |
277 | unsigned long a10; |
278 | unsigned long a11; |
279 | unsigned long a12; |
280 | unsigned long a13; |
281 | unsigned long a14; |
282 | unsigned long a15; |
283 | unsigned long a16; |
284 | unsigned long a17; |
285 | }; |
286 | |
287 | /** |
288 | * arm_smccc_1_2_hvc() - make HVC calls |
289 | * @args: arguments passed via struct arm_smccc_1_2_regs |
290 | * @res: result values via struct arm_smccc_1_2_regs |
291 | * |
292 | * This function is used to make HVC calls following SMC Calling Convention |
293 | * v1.2 or above. The content of the supplied param are copied from the |
294 | * structure to registers prior to the HVC instruction. The return values |
295 | * are updated with the content from registers on return from the HVC |
296 | * instruction. |
297 | */ |
298 | asmlinkage void arm_smccc_1_2_hvc(const struct arm_smccc_1_2_regs *args, |
299 | struct arm_smccc_1_2_regs *res); |
300 | |
301 | /** |
302 | * arm_smccc_1_2_smc() - make SMC calls |
303 | * @args: arguments passed via struct arm_smccc_1_2_regs |
304 | * @res: result values via struct arm_smccc_1_2_regs |
305 | * |
306 | * This function is used to make SMC calls following SMC Calling Convention |
307 | * v1.2 or above. The content of the supplied param are copied from the |
308 | * structure to registers prior to the SMC instruction. The return values |
309 | * are updated with the content from registers on return from the SMC |
310 | * instruction. |
311 | */ |
312 | asmlinkage void arm_smccc_1_2_smc(const struct arm_smccc_1_2_regs *args, |
313 | struct arm_smccc_1_2_regs *res); |
314 | #endif |
315 | |
316 | /** |
317 | * struct arm_smccc_quirk - Contains quirk information |
318 | * @id: quirk identification |
319 | * @state: quirk specific information |
320 | * @a6: Qualcomm quirk entry for returning post-smc call contents of a6 |
321 | */ |
322 | struct arm_smccc_quirk { |
323 | int id; |
324 | union { |
325 | unsigned long a6; |
326 | } state; |
327 | }; |
328 | |
329 | /** |
330 | * __arm_smccc_sve_check() - Set the SVE hint bit when doing SMC calls |
331 | * |
332 | * Sets the SMCCC hint bit to indicate if there is live state in the SVE |
333 | * registers, this modifies x0 in place and should never be called from C |
334 | * code. |
335 | */ |
336 | asmlinkage unsigned long __arm_smccc_sve_check(unsigned long x0); |
337 | |
338 | /** |
339 | * __arm_smccc_smc() - make SMC calls |
340 | * @a0-a7: arguments passed in registers 0 to 7 |
341 | * @res: result values from registers 0 to 3 |
342 | * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. |
343 | * |
344 | * This function is used to make SMC calls following SMC Calling Convention. |
345 | * The content of the supplied param are copied to registers 0 to 7 prior |
346 | * to the SMC instruction. The return values are updated with the content |
347 | * from register 0 to 3 on return from the SMC instruction. An optional |
348 | * quirk structure provides vendor specific behavior. |
349 | */ |
350 | #ifdef CONFIG_HAVE_ARM_SMCCC |
351 | asmlinkage void __arm_smccc_smc(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 | #else |
356 | static inline void __arm_smccc_smc(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 | *res = (struct arm_smccc_res){}; |
362 | } |
363 | #endif |
364 | |
365 | /** |
366 | * __arm_smccc_hvc() - make HVC calls |
367 | * @a0-a7: arguments passed in registers 0 to 7 |
368 | * @res: result values from registers 0 to 3 |
369 | * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. |
370 | * |
371 | * This function is used to make HVC calls following SMC Calling |
372 | * Convention. The content of the supplied param are copied to registers 0 |
373 | * to 7 prior to the HVC instruction. The return values are updated with |
374 | * the content from register 0 to 3 on return from the HVC instruction. An |
375 | * optional quirk structure provides vendor specific behavior. |
376 | */ |
377 | asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1, |
378 | unsigned long a2, unsigned long a3, unsigned long a4, |
379 | unsigned long a5, unsigned long a6, unsigned long a7, |
380 | struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); |
381 | |
382 | #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL) |
383 | |
384 | #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__) |
385 | |
386 | #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL) |
387 | |
388 | #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__) |
389 | |
390 | /* SMCCC v1.1 implementation madness follows */ |
391 | #ifdef CONFIG_ARM64 |
392 | |
393 | #define SMCCC_SMC_INST "smc #0" |
394 | #define SMCCC_HVC_INST "hvc #0" |
395 | |
396 | #elif defined(CONFIG_ARM) |
397 | #include <asm/opcodes-sec.h> |
398 | #include <asm/opcodes-virt.h> |
399 | |
400 | #define SMCCC_SMC_INST __SMC(0) |
401 | #define SMCCC_HVC_INST __HVC(0) |
402 | |
403 | #endif |
404 | |
405 | /* nVHE hypervisor doesn't have a current thread so needs separate checks */ |
406 | #if defined(CONFIG_ARM64_SVE) && !defined(__KVM_NVHE_HYPERVISOR__) |
407 | |
408 | #define SMCCC_SVE_CHECK ALTERNATIVE("nop \n", "bl __arm_smccc_sve_check \n", \ |
409 | ARM64_SVE) |
410 | #define smccc_sve_clobbers "x16", "x30", "cc", |
411 | |
412 | #else |
413 | |
414 | #define SMCCC_SVE_CHECK |
415 | #define smccc_sve_clobbers |
416 | |
417 | #endif |
418 | |
419 | #define __constraint_read_2 "r" (arg0) |
420 | #define __constraint_read_3 __constraint_read_2, "r" (arg1) |
421 | #define __constraint_read_4 __constraint_read_3, "r" (arg2) |
422 | #define __constraint_read_5 __constraint_read_4, "r" (arg3) |
423 | #define __constraint_read_6 __constraint_read_5, "r" (arg4) |
424 | #define __constraint_read_7 __constraint_read_6, "r" (arg5) |
425 | #define __constraint_read_8 __constraint_read_7, "r" (arg6) |
426 | #define __constraint_read_9 __constraint_read_8, "r" (arg7) |
427 | |
428 | #define __declare_arg_2(a0, res) \ |
429 | struct arm_smccc_res *___res = res; \ |
430 | register unsigned long arg0 asm("r0") = (u32)a0 |
431 | |
432 | #define __declare_arg_3(a0, a1, res) \ |
433 | typeof(a1) __a1 = a1; \ |
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 | |
438 | #define __declare_arg_4(a0, a1, a2, res) \ |
439 | typeof(a1) __a1 = a1; \ |
440 | typeof(a2) __a2 = a2; \ |
441 | struct arm_smccc_res *___res = res; \ |
442 | register unsigned long arg0 asm("r0") = (u32)a0; \ |
443 | register typeof(a1) arg1 asm("r1") = __a1; \ |
444 | register typeof(a2) arg2 asm("r2") = __a2 |
445 | |
446 | #define __declare_arg_5(a0, a1, a2, a3, res) \ |
447 | typeof(a1) __a1 = a1; \ |
448 | typeof(a2) __a2 = a2; \ |
449 | typeof(a3) __a3 = a3; \ |
450 | struct arm_smccc_res *___res = res; \ |
451 | register unsigned long arg0 asm("r0") = (u32)a0; \ |
452 | register typeof(a1) arg1 asm("r1") = __a1; \ |
453 | register typeof(a2) arg2 asm("r2") = __a2; \ |
454 | register typeof(a3) arg3 asm("r3") = __a3 |
455 | |
456 | #define __declare_arg_6(a0, a1, a2, a3, a4, res) \ |
457 | typeof(a4) __a4 = a4; \ |
458 | __declare_arg_5(a0, a1, a2, a3, res); \ |
459 | register typeof(a4) arg4 asm("r4") = __a4 |
460 | |
461 | #define __declare_arg_7(a0, a1, a2, a3, a4, a5, res) \ |
462 | typeof(a5) __a5 = a5; \ |
463 | __declare_arg_6(a0, a1, a2, a3, a4, res); \ |
464 | register typeof(a5) arg5 asm("r5") = __a5 |
465 | |
466 | #define __declare_arg_8(a0, a1, a2, a3, a4, a5, a6, res) \ |
467 | typeof(a6) __a6 = a6; \ |
468 | __declare_arg_7(a0, a1, a2, a3, a4, a5, res); \ |
469 | register typeof(a6) arg6 asm("r6") = __a6 |
470 | |
471 | #define __declare_arg_9(a0, a1, a2, a3, a4, a5, a6, a7, res) \ |
472 | typeof(a7) __a7 = a7; \ |
473 | __declare_arg_8(a0, a1, a2, a3, a4, a5, a6, res); \ |
474 | register typeof(a7) arg7 asm("r7") = __a7 |
475 | |
476 | /* |
477 | * We have an output list that is not necessarily used, and GCC feels |
478 | * entitled to optimise the whole sequence away. "volatile" is what |
479 | * makes it stick. |
480 | */ |
481 | #define __arm_smccc_1_1(inst, ...) \ |
482 | do { \ |
483 | register unsigned long r0 asm("r0"); \ |
484 | register unsigned long r1 asm("r1"); \ |
485 | register unsigned long r2 asm("r2"); \ |
486 | register unsigned long r3 asm("r3"); \ |
487 | CONCATENATE(__declare_arg_, \ |
488 | COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__); \ |
489 | asm volatile(SMCCC_SVE_CHECK \ |
490 | inst "\n" : \ |
491 | "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3) \ |
492 | : CONCATENATE(__constraint_read_, \ |
493 | COUNT_ARGS(__VA_ARGS__)) \ |
494 | : smccc_sve_clobbers "memory"); \ |
495 | if (___res) \ |
496 | *___res = (typeof(*___res)){r0, r1, r2, r3}; \ |
497 | } while (0) |
498 | |
499 | /* |
500 | * arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC 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 SMC 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 SMC instruction. The return values are updated with the content |
511 | * from register 0 to 3 on return from the SMC instruction if not NULL. |
512 | */ |
513 | #define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__) |
514 | |
515 | /* |
516 | * arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call |
517 | * |
518 | * This is a variadic macro taking one to eight source arguments, and |
519 | * an optional return structure. |
520 | * |
521 | * @a0-a7: arguments passed in registers 0 to 7 |
522 | * @res: result values from registers 0 to 3 |
523 | * |
524 | * This macro is used to make HVC calls following SMC Calling Convention v1.1. |
525 | * The content of the supplied param are copied to registers 0 to 7 prior |
526 | * to the HVC instruction. The return values are updated with the content |
527 | * from register 0 to 3 on return from the HVC instruction if not NULL. |
528 | */ |
529 | #define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__) |
530 | |
531 | /* |
532 | * Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED. |
533 | * Used when the SMCCC conduit is not defined. The empty asm statement |
534 | * avoids compiler warnings about unused variables. |
535 | */ |
536 | #define __fail_smccc_1_1(...) \ |
537 | do { \ |
538 | CONCATENATE(__declare_arg_, \ |
539 | COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__); \ |
540 | asm ("" : \ |
541 | : CONCATENATE(__constraint_read_, \ |
542 | COUNT_ARGS(__VA_ARGS__)) \ |
543 | : smccc_sve_clobbers "memory"); \ |
544 | if (___res) \ |
545 | ___res->a0 = SMCCC_RET_NOT_SUPPORTED; \ |
546 | } while (0) |
547 | |
548 | /* |
549 | * arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call |
550 | * |
551 | * This is a variadic macro taking one to eight source arguments, and |
552 | * an optional return structure. |
553 | * |
554 | * @a0-a7: arguments passed in registers 0 to 7 |
555 | * @res: result values from registers 0 to 3 |
556 | * |
557 | * This macro will make either an HVC call or an SMC call depending on the |
558 | * current SMCCC conduit. If no valid conduit is available then -1 |
559 | * (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied). |
560 | * |
561 | * The return value also provides the conduit that was used. |
562 | */ |
563 | #define arm_smccc_1_1_invoke(...) ({ \ |
564 | int method = arm_smccc_1_1_get_conduit(); \ |
565 | switch (method) { \ |
566 | case SMCCC_CONDUIT_HVC: \ |
567 | arm_smccc_1_1_hvc(__VA_ARGS__); \ |
568 | break; \ |
569 | case SMCCC_CONDUIT_SMC: \ |
570 | arm_smccc_1_1_smc(__VA_ARGS__); \ |
571 | break; \ |
572 | default: \ |
573 | __fail_smccc_1_1(__VA_ARGS__); \ |
574 | method = SMCCC_CONDUIT_NONE; \ |
575 | break; \ |
576 | } \ |
577 | method; \ |
578 | }) |
579 | |
580 | #endif /*__ASSEMBLY__*/ |
581 | #endif /*__LINUX_ARM_SMCCC_H*/ |
582 | |