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 * arm_smccc_get_soc_id_version() 231 * 232 * Returns the SOC ID version. 233 * 234 * When ARM_SMCCC_ARCH_SOC_ID is not present, returns SMCCC_RET_NOT_SUPPORTED. 235 */ 236 s32 arm_smccc_get_soc_id_version(void); 237 238 /** 239 * arm_smccc_get_soc_id_revision() 240 * 241 * Returns the SOC ID revision. 242 * 243 * When ARM_SMCCC_ARCH_SOC_ID is not present, returns SMCCC_RET_NOT_SUPPORTED. 244 */ 245 s32 arm_smccc_get_soc_id_revision(void); 246 247 /** 248 * struct arm_smccc_res - Result from SMC/HVC call 249 * @a0-a3 result values from registers 0 to 3 250 */ 251 struct arm_smccc_res { 252 unsigned long a0; 253 unsigned long a1; 254 unsigned long a2; 255 unsigned long a3; 256 }; 257 258 #ifdef CONFIG_ARM64 259 /** 260 * struct arm_smccc_1_2_regs - Arguments for or Results from SMC/HVC call 261 * @a0-a17 argument values from registers 0 to 17 262 */ 263 struct arm_smccc_1_2_regs { 264 unsigned long a0; 265 unsigned long a1; 266 unsigned long a2; 267 unsigned long a3; 268 unsigned long a4; 269 unsigned long a5; 270 unsigned long a6; 271 unsigned long a7; 272 unsigned long a8; 273 unsigned long a9; 274 unsigned long a10; 275 unsigned long a11; 276 unsigned long a12; 277 unsigned long a13; 278 unsigned long a14; 279 unsigned long a15; 280 unsigned long a16; 281 unsigned long a17; 282 }; 283 284 /** 285 * arm_smccc_1_2_hvc() - make HVC calls 286 * @args: arguments passed via struct arm_smccc_1_2_regs 287 * @res: result values via struct arm_smccc_1_2_regs 288 * 289 * This function is used to make HVC calls following SMC Calling Convention 290 * v1.2 or above. The content of the supplied param are copied from the 291 * structure to registers prior to the HVC instruction. The return values 292 * are updated with the content from registers on return from the HVC 293 * instruction. 294 */ 295 asmlinkage void arm_smccc_1_2_hvc(const struct arm_smccc_1_2_regs *args, 296 struct arm_smccc_1_2_regs *res); 297 298 /** 299 * arm_smccc_1_2_smc() - make SMC calls 300 * @args: arguments passed via struct arm_smccc_1_2_regs 301 * @res: result values via struct arm_smccc_1_2_regs 302 * 303 * This function is used to make SMC calls following SMC Calling Convention 304 * v1.2 or above. The content of the supplied param are copied from the 305 * structure to registers prior to the SMC instruction. The return values 306 * are updated with the content from registers on return from the SMC 307 * instruction. 308 */ 309 asmlinkage void arm_smccc_1_2_smc(const struct arm_smccc_1_2_regs *args, 310 struct arm_smccc_1_2_regs *res); 311 #endif 312 313 /** 314 * struct arm_smccc_quirk - Contains quirk information 315 * @id: quirk identification 316 * @state: quirk specific information 317 * @a6: Qualcomm quirk entry for returning post-smc call contents of a6 318 */ 319 struct arm_smccc_quirk { 320 int id; 321 union { 322 unsigned long a6; 323 } state; 324 }; 325 326 /** 327 * __arm_smccc_sve_check() - Set the SVE hint bit when doing SMC calls 328 * 329 * Sets the SMCCC hint bit to indicate if there is live state in the SVE 330 * registers, this modifies x0 in place and should never be called from C 331 * code. 332 */ 333 asmlinkage unsigned long __arm_smccc_sve_check(unsigned long x0); 334 335 /** 336 * __arm_smccc_smc() - make SMC calls 337 * @a0-a7: arguments passed in registers 0 to 7 338 * @res: result values from registers 0 to 3 339 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. 340 * 341 * This function is used to make SMC calls following SMC Calling Convention. 342 * The content of the supplied param are copied to registers 0 to 7 prior 343 * to the SMC instruction. The return values are updated with the content 344 * from register 0 to 3 on return from the SMC instruction. An optional 345 * quirk structure provides vendor specific behavior. 346 */ 347 #ifdef CONFIG_HAVE_ARM_SMCCC 348 asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1, 349 unsigned long a2, unsigned long a3, unsigned long a4, 350 unsigned long a5, unsigned long a6, unsigned long a7, 351 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); 352 #else 353 static inline void __arm_smccc_smc(unsigned long a0, unsigned long a1, 354 unsigned long a2, unsigned long a3, unsigned long a4, 355 unsigned long a5, unsigned long a6, unsigned long a7, 356 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk) 357 { 358 *res = (struct arm_smccc_res){}; 359 } 360 #endif 361 362 /** 363 * __arm_smccc_hvc() - make HVC calls 364 * @a0-a7: arguments passed in registers 0 to 7 365 * @res: result values from registers 0 to 3 366 * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. 367 * 368 * This function is used to make HVC calls following SMC Calling 369 * Convention. The content of the supplied param are copied to registers 0 370 * to 7 prior to the HVC instruction. The return values are updated with 371 * the content from register 0 to 3 on return from the HVC instruction. An 372 * optional quirk structure provides vendor specific behavior. 373 */ 374 asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1, 375 unsigned long a2, unsigned long a3, unsigned long a4, 376 unsigned long a5, unsigned long a6, unsigned long a7, 377 struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); 378 379 #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL) 380 381 #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__) 382 383 #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL) 384 385 #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__) 386 387 /* SMCCC v1.1 implementation madness follows */ 388 #ifdef CONFIG_ARM64 389 390 #define SMCCC_SMC_INST "smc #0" 391 #define SMCCC_HVC_INST "hvc #0" 392 393 #elif defined(CONFIG_ARM) 394 #include <asm/opcodes-sec.h> 395 #include <asm/opcodes-virt.h> 396 397 #define SMCCC_SMC_INST __SMC(0) 398 #define SMCCC_HVC_INST __HVC(0) 399 400 #endif 401 402 /* nVHE hypervisor doesn't have a current thread so needs separate checks */ 403 #if defined(CONFIG_ARM64_SVE) && !defined(__KVM_NVHE_HYPERVISOR__) 404 405 #define SMCCC_SVE_CHECK ALTERNATIVE("nop \n", "bl __arm_smccc_sve_check \n", \ 406 ARM64_SVE) 407 #define smccc_sve_clobbers "x16", "x30", "cc", 408 409 #else 410 411 #define SMCCC_SVE_CHECK 412 #define smccc_sve_clobbers 413 414 #endif 415 416 #define ___count_args(_0, _1, _2, _3, _4, _5, _6, _7, _8, x, ...) x 417 418 #define __count_args(...) \ 419 ___count_args(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0) 420 421 #define __constraint_read_0 "r" (arg0) 422 #define __constraint_read_1 __constraint_read_0, "r" (arg1) 423 #define __constraint_read_2 __constraint_read_1, "r" (arg2) 424 #define __constraint_read_3 __constraint_read_2, "r" (arg3) 425 #define __constraint_read_4 __constraint_read_3, "r" (arg4) 426 #define __constraint_read_5 __constraint_read_4, "r" (arg5) 427 #define __constraint_read_6 __constraint_read_5, "r" (arg6) 428 #define __constraint_read_7 __constraint_read_6, "r" (arg7) 429 430 #define __declare_arg_0(a0, res) \ 431 struct arm_smccc_res *___res = res; \ 432 register unsigned long arg0 asm("r0") = (u32)a0 433 434 #define __declare_arg_1(a0, a1, res) \ 435 typeof(a1) __a1 = a1; \ 436 struct arm_smccc_res *___res = res; \ 437 register unsigned long arg0 asm("r0") = (u32)a0; \ 438 register typeof(a1) arg1 asm("r1") = __a1 439 440 #define __declare_arg_2(a0, a1, a2, res) \ 441 typeof(a1) __a1 = a1; \ 442 typeof(a2) __a2 = a2; \ 443 struct arm_smccc_res *___res = res; \ 444 register unsigned long arg0 asm("r0") = (u32)a0; \ 445 register typeof(a1) arg1 asm("r1") = __a1; \ 446 register typeof(a2) arg2 asm("r2") = __a2 447 448 #define __declare_arg_3(a0, a1, a2, a3, res) \ 449 typeof(a1) __a1 = a1; \ 450 typeof(a2) __a2 = a2; \ 451 typeof(a3) __a3 = a3; \ 452 struct arm_smccc_res *___res = res; \ 453 register unsigned long arg0 asm("r0") = (u32)a0; \ 454 register typeof(a1) arg1 asm("r1") = __a1; \ 455 register typeof(a2) arg2 asm("r2") = __a2; \ 456 register typeof(a3) arg3 asm("r3") = __a3 457 458 #define __declare_arg_4(a0, a1, a2, a3, a4, res) \ 459 typeof(a4) __a4 = a4; \ 460 __declare_arg_3(a0, a1, a2, a3, res); \ 461 register typeof(a4) arg4 asm("r4") = __a4 462 463 #define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \ 464 typeof(a5) __a5 = a5; \ 465 __declare_arg_4(a0, a1, a2, a3, a4, res); \ 466 register typeof(a5) arg5 asm("r5") = __a5 467 468 #define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \ 469 typeof(a6) __a6 = a6; \ 470 __declare_arg_5(a0, a1, a2, a3, a4, a5, res); \ 471 register typeof(a6) arg6 asm("r6") = __a6 472 473 #define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \ 474 typeof(a7) __a7 = a7; \ 475 __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \ 476 register typeof(a7) arg7 asm("r7") = __a7 477 478 #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__) 479 #define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__) 480 481 #define ___constraints(count) \ 482 : __constraint_read_ ## count \ 483 : smccc_sve_clobbers "memory" 484 #define __constraints(count) ___constraints(count) 485 486 /* 487 * We have an output list that is not necessarily used, and GCC feels 488 * entitled to optimise the whole sequence away. "volatile" is what 489 * makes it stick. 490 */ 491 #define __arm_smccc_1_1(inst, ...) \ 492 do { \ 493 register unsigned long r0 asm("r0"); \ 494 register unsigned long r1 asm("r1"); \ 495 register unsigned long r2 asm("r2"); \ 496 register unsigned long r3 asm("r3"); \ 497 __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \ 498 asm volatile(SMCCC_SVE_CHECK \ 499 inst "\n" : \ 500 "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3) \ 501 __constraints(__count_args(__VA_ARGS__))); \ 502 if (___res) \ 503 *___res = (typeof(*___res)){r0, r1, r2, r3}; \ 504 } while (0) 505 506 /* 507 * arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call 508 * 509 * This is a variadic macro taking one to eight source arguments, and 510 * an optional return structure. 511 * 512 * @a0-a7: arguments passed in registers 0 to 7 513 * @res: result values from registers 0 to 3 514 * 515 * This macro is used to make SMC calls following SMC Calling Convention v1.1. 516 * The content of the supplied param are copied to registers 0 to 7 prior 517 * to the SMC instruction. The return values are updated with the content 518 * from register 0 to 3 on return from the SMC instruction if not NULL. 519 */ 520 #define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__) 521 522 /* 523 * arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call 524 * 525 * This is a variadic macro taking one to eight source arguments, and 526 * an optional return structure. 527 * 528 * @a0-a7: arguments passed in registers 0 to 7 529 * @res: result values from registers 0 to 3 530 * 531 * This macro is used to make HVC calls following SMC Calling Convention v1.1. 532 * The content of the supplied param are copied to registers 0 to 7 prior 533 * to the HVC instruction. The return values are updated with the content 534 * from register 0 to 3 on return from the HVC instruction if not NULL. 535 */ 536 #define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__) 537 538 /* 539 * Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED. 540 * Used when the SMCCC conduit is not defined. The empty asm statement 541 * avoids compiler warnings about unused variables. 542 */ 543 #define __fail_smccc_1_1(...) \ 544 do { \ 545 __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \ 546 asm ("" : __constraints(__count_args(__VA_ARGS__))); \ 547 if (___res) \ 548 ___res->a0 = SMCCC_RET_NOT_SUPPORTED; \ 549 } while (0) 550 551 /* 552 * arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call 553 * 554 * This is a variadic macro taking one to eight source arguments, and 555 * an optional return structure. 556 * 557 * @a0-a7: arguments passed in registers 0 to 7 558 * @res: result values from registers 0 to 3 559 * 560 * This macro will make either an HVC call or an SMC call depending on the 561 * current SMCCC conduit. If no valid conduit is available then -1 562 * (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied). 563 * 564 * The return value also provides the conduit that was used. 565 */ 566 #define arm_smccc_1_1_invoke(...) ({ \ 567 int method = arm_smccc_1_1_get_conduit(); \ 568 switch (method) { \ 569 case SMCCC_CONDUIT_HVC: \ 570 arm_smccc_1_1_hvc(__VA_ARGS__); \ 571 break; \ 572 case SMCCC_CONDUIT_SMC: \ 573 arm_smccc_1_1_smc(__VA_ARGS__); \ 574 break; \ 575 default: \ 576 __fail_smccc_1_1(__VA_ARGS__); \ 577 method = SMCCC_CONDUIT_NONE; \ 578 break; \ 579 } \ 580 method; \ 581 }) 582 583 #endif /*__ASSEMBLY__*/ 584 #endif /*__LINUX_ARM_SMCCC_H*/ 585