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 71 #define ARM_SMCCC_VERSION_FUNC_ID \ 72 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 73 ARM_SMCCC_SMC_32, \ 74 0, 0) 75 76 #define ARM_SMCCC_ARCH_FEATURES_FUNC_ID \ 77 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 78 ARM_SMCCC_SMC_32, \ 79 0, 1) 80 81 #define ARM_SMCCC_ARCH_SOC_ID \ 82 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 83 ARM_SMCCC_SMC_32, \ 84 0, 2) 85 86 #define ARM_SMCCC_ARCH_WORKAROUND_1 \ 87 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 88 ARM_SMCCC_SMC_32, \ 89 0, 0x8000) 90 91 #define ARM_SMCCC_ARCH_WORKAROUND_2 \ 92 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 93 ARM_SMCCC_SMC_32, \ 94 0, 0x7fff) 95 96 #define ARM_SMCCC_ARCH_WORKAROUND_3 \ 97 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 98 ARM_SMCCC_SMC_32, \ 99 0, 0x3fff) 100 101 #define ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID \ 102 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 103 ARM_SMCCC_SMC_32, \ 104 ARM_SMCCC_OWNER_VENDOR_HYP, \ 105 ARM_SMCCC_FUNC_QUERY_CALL_UID) 106 107 /* KVM UID value: 28b46fb6-2ec5-11e9-a9ca-4b564d003a74 */ 108 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 0xb66fb428U 109 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 0xe911c52eU 110 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 0x564bcaa9U 111 #define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3 0x743a004dU 112 113 /* KVM "vendor specific" services */ 114 #define ARM_SMCCC_KVM_FUNC_FEATURES 0 115 #define ARM_SMCCC_KVM_FUNC_PTP 1 116 #define ARM_SMCCC_KVM_FUNC_FEATURES_2 127 117 #define ARM_SMCCC_KVM_NUM_FUNCS 128 118 119 #define ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID \ 120 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 121 ARM_SMCCC_SMC_32, \ 122 ARM_SMCCC_OWNER_VENDOR_HYP, \ 123 ARM_SMCCC_KVM_FUNC_FEATURES) 124 125 #define SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED 1 126 127 /* 128 * ptp_kvm is a feature used for time sync between vm and host. 129 * ptp_kvm module in guest kernel will get service from host using 130 * this hypercall ID. 131 */ 132 #define ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID \ 133 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 134 ARM_SMCCC_SMC_32, \ 135 ARM_SMCCC_OWNER_VENDOR_HYP, \ 136 ARM_SMCCC_KVM_FUNC_PTP) 137 138 /* ptp_kvm counter type ID */ 139 #define KVM_PTP_VIRT_COUNTER 0 140 #define KVM_PTP_PHYS_COUNTER 1 141 142 /* Paravirtualised time calls (defined by ARM DEN0057A) */ 143 #define ARM_SMCCC_HV_PV_TIME_FEATURES \ 144 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 145 ARM_SMCCC_SMC_64, \ 146 ARM_SMCCC_OWNER_STANDARD_HYP, \ 147 0x20) 148 149 #define ARM_SMCCC_HV_PV_TIME_ST \ 150 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 151 ARM_SMCCC_SMC_64, \ 152 ARM_SMCCC_OWNER_STANDARD_HYP, \ 153 0x21) 154 155 /* TRNG entropy source calls (defined by ARM DEN0098) */ 156 #define ARM_SMCCC_TRNG_VERSION \ 157 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 158 ARM_SMCCC_SMC_32, \ 159 ARM_SMCCC_OWNER_STANDARD, \ 160 0x50) 161 162 #define ARM_SMCCC_TRNG_FEATURES \ 163 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 164 ARM_SMCCC_SMC_32, \ 165 ARM_SMCCC_OWNER_STANDARD, \ 166 0x51) 167 168 #define ARM_SMCCC_TRNG_GET_UUID \ 169 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 170 ARM_SMCCC_SMC_32, \ 171 ARM_SMCCC_OWNER_STANDARD, \ 172 0x52) 173 174 #define ARM_SMCCC_TRNG_RND32 \ 175 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 176 ARM_SMCCC_SMC_32, \ 177 ARM_SMCCC_OWNER_STANDARD, \ 178 0x53) 179 180 #define ARM_SMCCC_TRNG_RND64 \ 181 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 182 ARM_SMCCC_SMC_64, \ 183 ARM_SMCCC_OWNER_STANDARD, \ 184 0x53) 185 186 /* 187 * Return codes defined in ARM DEN 0070A 188 * ARM DEN 0070A is now merged/consolidated into ARM DEN 0028 C 189 */ 190 #define SMCCC_RET_SUCCESS 0 191 #define SMCCC_RET_NOT_SUPPORTED -1 192 #define SMCCC_RET_NOT_REQUIRED -2 193 #define SMCCC_RET_INVALID_PARAMETER -3 194 195 #ifndef __ASSEMBLY__ 196 197 #include <linux/linkage.h> 198 #include <linux/types.h> 199 200 enum arm_smccc_conduit { 201 SMCCC_CONDUIT_NONE, 202 SMCCC_CONDUIT_SMC, 203 SMCCC_CONDUIT_HVC, 204 }; 205 206 /** 207 * arm_smccc_1_1_get_conduit() 208 * 209 * Returns the conduit to be used for SMCCCv1.1 or later. 210 * 211 * When SMCCCv1.1 is not present, returns SMCCC_CONDUIT_NONE. 212 */ 213 enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void); 214 215 /** 216 * arm_smccc_get_version() 217 * 218 * Returns the version to be used for SMCCCv1.1 or later. 219 * 220 * When SMCCCv1.1 or above is not present, returns SMCCCv1.0, but this 221 * does not imply the presence of firmware or a valid conduit. Caller 222 * handling SMCCCv1.0 must determine the conduit by other means. 223 */ 224 u32 arm_smccc_get_version(void); 225 226 void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit); 227 228 extern u64 smccc_has_sve_hint; 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_sve_check() - Set the SVE hint bit when doing SMC calls 329 * 330 * Sets the SMCCC hint bit to indicate if there is live state in the SVE 331 * registers, this modifies x0 in place and should never be called from C 332 * code. 333 */ 334 asmlinkage unsigned long __arm_smccc_sve_check(unsigned long x0); 335 336 /** 337 * __arm_smccc_smc() - make SMC calls 338 * @a0-a7: arguments passed in registers 0 to 7 339 * @res: result values from registers 0 to 3 340 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. 341 * 342 * This function is used to make SMC calls following SMC Calling Convention. 343 * The content of the supplied param are copied to registers 0 to 7 prior 344 * to the SMC instruction. The return values are updated with the content 345 * from register 0 to 3 on return from the SMC instruction. An optional 346 * quirk structure provides vendor specific behavior. 347 */ 348 #ifdef CONFIG_HAVE_ARM_SMCCC 349 asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1, 350 unsigned long a2, unsigned long a3, unsigned long a4, 351 unsigned long a5, unsigned long a6, unsigned long a7, 352 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); 353 #else 354 static inline void __arm_smccc_smc(unsigned long a0, unsigned long a1, 355 unsigned long a2, unsigned long a3, unsigned long a4, 356 unsigned long a5, unsigned long a6, unsigned long a7, 357 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk) 358 { 359 *res = (struct arm_smccc_res){}; 360 } 361 #endif 362 363 /** 364 * __arm_smccc_hvc() - make HVC calls 365 * @a0-a7: arguments passed in registers 0 to 7 366 * @res: result values from registers 0 to 3 367 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. 368 * 369 * This function is used to make HVC calls following SMC Calling 370 * Convention. The content of the supplied param are copied to registers 0 371 * to 7 prior to the HVC instruction. The return values are updated with 372 * the content from register 0 to 3 on return from the HVC instruction. An 373 * optional quirk structure provides vendor specific behavior. 374 */ 375 asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1, 376 unsigned long a2, unsigned long a3, unsigned long a4, 377 unsigned long a5, unsigned long a6, unsigned long a7, 378 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); 379 380 #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL) 381 382 #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__) 383 384 #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL) 385 386 #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__) 387 388 /* SMCCC v1.1 implementation madness follows */ 389 #ifdef CONFIG_ARM64 390 391 #define SMCCC_SMC_INST "smc #0" 392 #define SMCCC_HVC_INST "hvc #0" 393 394 #elif defined(CONFIG_ARM) 395 #include <asm/opcodes-sec.h> 396 #include <asm/opcodes-virt.h> 397 398 #define SMCCC_SMC_INST __SMC(0) 399 #define SMCCC_HVC_INST __HVC(0) 400 401 #endif 402 403 /* nVHE hypervisor doesn't have a current thread so needs separate checks */ 404 #if defined(CONFIG_ARM64_SVE) && !defined(__KVM_NVHE_HYPERVISOR__) 405 406 #define SMCCC_SVE_CHECK ALTERNATIVE("nop \n", "bl __arm_smccc_sve_check \n", \ 407 ARM64_SVE) 408 #define smccc_sve_clobbers "x16", "x30", "cc", 409 410 #else 411 412 #define SMCCC_SVE_CHECK 413 #define smccc_sve_clobbers 414 415 #endif 416 417 #define __constraint_read_2 "r" (arg0) 418 #define __constraint_read_3 __constraint_read_2, "r" (arg1) 419 #define __constraint_read_4 __constraint_read_3, "r" (arg2) 420 #define __constraint_read_5 __constraint_read_4, "r" (arg3) 421 #define __constraint_read_6 __constraint_read_5, "r" (arg4) 422 #define __constraint_read_7 __constraint_read_6, "r" (arg5) 423 #define __constraint_read_8 __constraint_read_7, "r" (arg6) 424 #define __constraint_read_9 __constraint_read_8, "r" (arg7) 425 426 #define __declare_arg_2(a0, res) \ 427 struct arm_smccc_res *___res = res; \ 428 register unsigned long arg0 asm("r0") = (u32)a0 429 430 #define __declare_arg_3(a0, a1, res) \ 431 typeof(a1) __a1 = a1; \ 432 struct arm_smccc_res *___res = res; \ 433 register unsigned long arg0 asm("r0") = (u32)a0; \ 434 register typeof(a1) arg1 asm("r1") = __a1 435 436 #define __declare_arg_4(a0, a1, a2, res) \ 437 typeof(a1) __a1 = a1; \ 438 typeof(a2) __a2 = a2; \ 439 struct arm_smccc_res *___res = res; \ 440 register unsigned long arg0 asm("r0") = (u32)a0; \ 441 register typeof(a1) arg1 asm("r1") = __a1; \ 442 register typeof(a2) arg2 asm("r2") = __a2 443 444 #define __declare_arg_5(a0, a1, a2, a3, res) \ 445 typeof(a1) __a1 = a1; \ 446 typeof(a2) __a2 = a2; \ 447 typeof(a3) __a3 = a3; \ 448 struct arm_smccc_res *___res = res; \ 449 register unsigned long arg0 asm("r0") = (u32)a0; \ 450 register typeof(a1) arg1 asm("r1") = __a1; \ 451 register typeof(a2) arg2 asm("r2") = __a2; \ 452 register typeof(a3) arg3 asm("r3") = __a3 453 454 #define __declare_arg_6(a0, a1, a2, a3, a4, res) \ 455 typeof(a4) __a4 = a4; \ 456 __declare_arg_5(a0, a1, a2, a3, res); \ 457 register typeof(a4) arg4 asm("r4") = __a4 458 459 #define __declare_arg_7(a0, a1, a2, a3, a4, a5, res) \ 460 typeof(a5) __a5 = a5; \ 461 __declare_arg_6(a0, a1, a2, a3, a4, res); \ 462 register typeof(a5) arg5 asm("r5") = __a5 463 464 #define __declare_arg_8(a0, a1, a2, a3, a4, a5, a6, res) \ 465 typeof(a6) __a6 = a6; \ 466 __declare_arg_7(a0, a1, a2, a3, a4, a5, res); \ 467 register typeof(a6) arg6 asm("r6") = __a6 468 469 #define __declare_arg_9(a0, a1, a2, a3, a4, a5, a6, a7, res) \ 470 typeof(a7) __a7 = a7; \ 471 __declare_arg_8(a0, a1, a2, a3, a4, a5, a6, res); \ 472 register typeof(a7) arg7 asm("r7") = __a7 473 474 /* 475 * We have an output list that is not necessarily used, and GCC feels 476 * entitled to optimise the whole sequence away. "volatile" is what 477 * makes it stick. 478 */ 479 #define __arm_smccc_1_1(inst, ...) \ 480 do { \ 481 register unsigned long r0 asm("r0"); \ 482 register unsigned long r1 asm("r1"); \ 483 register unsigned long r2 asm("r2"); \ 484 register unsigned long r3 asm("r3"); \ 485 CONCATENATE(__declare_arg_, \ 486 COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__); \ 487 asm volatile(SMCCC_SVE_CHECK \ 488 inst "\n" : \ 489 "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3) \ 490 : CONCATENATE(__constraint_read_, \ 491 COUNT_ARGS(__VA_ARGS__)) \ 492 : smccc_sve_clobbers "memory"); \ 493 if (___res) \ 494 *___res = (typeof(*___res)){r0, r1, r2, r3}; \ 495 } while (0) 496 497 /* 498 * arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call 499 * 500 * This is a variadic macro taking one to eight source arguments, and 501 * an optional return structure. 502 * 503 * @a0-a7: arguments passed in registers 0 to 7 504 * @res: result values from registers 0 to 3 505 * 506 * This macro is used to make SMC calls following SMC Calling Convention v1.1. 507 * The content of the supplied param are copied to registers 0 to 7 prior 508 * to the SMC instruction. The return values are updated with the content 509 * from register 0 to 3 on return from the SMC instruction if not NULL. 510 */ 511 #define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__) 512 513 /* 514 * arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call 515 * 516 * This is a variadic macro taking one to eight source arguments, and 517 * an optional return structure. 518 * 519 * @a0-a7: arguments passed in registers 0 to 7 520 * @res: result values from registers 0 to 3 521 * 522 * This macro is used to make HVC calls following SMC Calling Convention v1.1. 523 * The content of the supplied param are copied to registers 0 to 7 prior 524 * to the HVC instruction. The return values are updated with the content 525 * from register 0 to 3 on return from the HVC instruction if not NULL. 526 */ 527 #define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__) 528 529 /* 530 * Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED. 531 * Used when the SMCCC conduit is not defined. The empty asm statement 532 * avoids compiler warnings about unused variables. 533 */ 534 #define __fail_smccc_1_1(...) \ 535 do { \ 536 CONCATENATE(__declare_arg_, \ 537 COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__); \ 538 asm ("" : \ 539 : CONCATENATE(__constraint_read_, \ 540 COUNT_ARGS(__VA_ARGS__)) \ 541 : smccc_sve_clobbers "memory"); \ 542 if (___res) \ 543 ___res->a0 = SMCCC_RET_NOT_SUPPORTED; \ 544 } while (0) 545 546 /* 547 * arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call 548 * 549 * This is a variadic macro taking one to eight source arguments, and 550 * an optional return structure. 551 * 552 * @a0-a7: arguments passed in registers 0 to 7 553 * @res: result values from registers 0 to 3 554 * 555 * This macro will make either an HVC call or an SMC call depending on the 556 * current SMCCC conduit. If no valid conduit is available then -1 557 * (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied). 558 * 559 * The return value also provides the conduit that was used. 560 */ 561 #define arm_smccc_1_1_invoke(...) ({ \ 562 int method = arm_smccc_1_1_get_conduit(); \ 563 switch (method) { \ 564 case SMCCC_CONDUIT_HVC: \ 565 arm_smccc_1_1_hvc(__VA_ARGS__); \ 566 break; \ 567 case SMCCC_CONDUIT_SMC: \ 568 arm_smccc_1_1_smc(__VA_ARGS__); \ 569 break; \ 570 default: \ 571 __fail_smccc_1_1(__VA_ARGS__); \ 572 method = SMCCC_CONDUIT_NONE; \ 573 break; \ 574 } \ 575 method; \ 576 }) 577 578 #endif /*__ASSEMBLY__*/ 579 #endif /*__LINUX_ARM_SMCCC_H*/ 580