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 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