include/linux/arm-smccc.h

   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 asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1,
 325                         unsigned long a2, unsigned long a3, unsigned long a4,
 326                         unsigned long a5, unsigned long a6, unsigned long a7,
 327                         struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
 328
 329 /**
 330  * __arm_smccc_hvc() - make HVC calls
 331  * @a0-a7: arguments passed in registers 0 to 7
 332  * @res: result values from registers 0 to 3
 333  * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
 334  *
 335  * This function is used to make HVC calls following SMC Calling
 336  * Convention.  The content of the supplied param are copied to registers 0
 337  * to 7 prior to the HVC instruction. The return values are updated with
 338  * the content from register 0 to 3 on return from the HVC instruction.  An
 339  * optional quirk structure provides vendor specific behavior.
 340  */
 341 asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
 342                         unsigned long a2, unsigned long a3, unsigned long a4,
 343                         unsigned long a5, unsigned long a6, unsigned long a7,
 344                         struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
 345
 346 #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)
 347
 348 #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__)
 349
 350 #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL)
 351
 352 #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__)
 353
 354 /* SMCCC v1.1 implementation madness follows */
 355 #ifdef CONFIG_ARM64
 356
 357 #define SMCCC_SMC_INST  "smc    #0"
 358 #define SMCCC_HVC_INST  "hvc    #0"
 359
 360 #elif defined(CONFIG_ARM)
 361 #include <asm/opcodes-sec.h>
 362 #include <asm/opcodes-virt.h>
 363
 364 #define SMCCC_SMC_INST  __SMC(0)
 365 #define SMCCC_HVC_INST  __HVC(0)
 366
 367 #endif
 368
 369 /* nVHE hypervisor doesn't have a current thread so needs separate checks */
 370 #if defined(CONFIG_ARM64_SVE) && !defined(__KVM_NVHE_HYPERVISOR__)
 371
 372 #define SMCCC_SVE_CHECK ALTERNATIVE("nop \n",  "bl __arm_smccc_sve_check \n", \
 373                                     ARM64_SVE)
 374 #define smccc_sve_clobbers "x16", "x30", "cc",
 375
 376 #else
 377
 378 #define SMCCC_SVE_CHECK
 379 #define smccc_sve_clobbers
 380
 381 #endif
 382
 383 #define ___count_args(_0, _1, _2, _3, _4, _5, _6, _7, _8, x, ...) x
 384
 385 #define __count_args(...)                                               \
 386         ___count_args(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0)
 387
 388 #define __constraint_read_0     "r" (arg0)
 389 #define __constraint_read_1     __constraint_read_0, "r" (arg1)
 390 #define __constraint_read_2     __constraint_read_1, "r" (arg2)
 391 #define __constraint_read_3     __constraint_read_2, "r" (arg3)
 392 #define __constraint_read_4     __constraint_read_3, "r" (arg4)
 393 #define __constraint_read_5     __constraint_read_4, "r" (arg5)
 394 #define __constraint_read_6     __constraint_read_5, "r" (arg6)
 395 #define __constraint_read_7     __constraint_read_6, "r" (arg7)
 396
 397 #define __declare_arg_0(a0, res)                                        \
 398         struct arm_smccc_res   *___res = res;                           \
 399         register unsigned long arg0 asm("r0") = (u32)a0
 400
 401 #define __declare_arg_1(a0, a1, res)                                    \
 402         typeof(a1) __a1 = a1;                                           \
 403         struct arm_smccc_res   *___res = res;                           \
 404         register unsigned long arg0 asm("r0") = (u32)a0;                        \
 405         register typeof(a1) arg1 asm("r1") = __a1
 406
 407 #define __declare_arg_2(a0, a1, a2, res)                                \
 408         typeof(a1) __a1 = a1;                                           \
 409         typeof(a2) __a2 = a2;                                           \
 410         struct arm_smccc_res   *___res = res;                           \
 411         register unsigned long arg0 asm("r0") = (u32)a0;                        \
 412         register typeof(a1) arg1 asm("r1") = __a1;                      \
 413         register typeof(a2) arg2 asm("r2") = __a2
 414
 415 #define __declare_arg_3(a0, a1, a2, a3, res)                            \
 416         typeof(a1) __a1 = a1;                                           \
 417         typeof(a2) __a2 = a2;                                           \
 418         typeof(a3) __a3 = a3;                                           \
 419         struct arm_smccc_res   *___res = res;                           \
 420         register unsigned long arg0 asm("r0") = (u32)a0;                        \
 421         register typeof(a1) arg1 asm("r1") = __a1;                      \
 422         register typeof(a2) arg2 asm("r2") = __a2;                      \
 423         register typeof(a3) arg3 asm("r3") = __a3
 424
 425 #define __declare_arg_4(a0, a1, a2, a3, a4, res)                        \
 426         typeof(a4) __a4 = a4;                                           \
 427         __declare_arg_3(a0, a1, a2, a3, res);                           \
 428         register typeof(a4) arg4 asm("r4") = __a4
 429
 430 #define __declare_arg_5(a0, a1, a2, a3, a4, a5, res)                    \
 431         typeof(a5) __a5 = a5;                                           \
 432         __declare_arg_4(a0, a1, a2, a3, a4, res);                       \
 433         register typeof(a5) arg5 asm("r5") = __a5
 434
 435 #define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res)                \
 436         typeof(a6) __a6 = a6;                                           \
 437         __declare_arg_5(a0, a1, a2, a3, a4, a5, res);                   \
 438         register typeof(a6) arg6 asm("r6") = __a6
 439
 440 #define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res)            \
 441         typeof(a7) __a7 = a7;                                           \
 442         __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res);               \
 443         register typeof(a7) arg7 asm("r7") = __a7
 444
 445 #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__)
 446 #define __declare_args(count, ...)  ___declare_args(count, __VA_ARGS__)
 447
 448 #define ___constraints(count)                                           \
 449         : __constraint_read_ ## count                                   \
 450         : smccc_sve_clobbers "memory"
 451 #define __constraints(count)    ___constraints(count)
 452
 453 /*
 454  * We have an output list that is not necessarily used, and GCC feels
 455  * entitled to optimise the whole sequence away. "volatile" is what
 456  * makes it stick.
 457  */
 458 #define __arm_smccc_1_1(inst, ...)                                      \
 459         do {                                                            \
 460                 register unsigned long r0 asm("r0");                    \
 461                 register unsigned long r1 asm("r1");                    \
 462                 register unsigned long r2 asm("r2");                    \
 463                 register unsigned long r3 asm("r3");                    \
 464                 __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
 465                 asm volatile(SMCCC_SVE_CHECK                            \
 466                              inst "\n" :                                \
 467                              "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3) \
 468                              __constraints(__count_args(__VA_ARGS__))); \
 469                 if (___res)                                             \
 470                         *___res = (typeof(*___res)){r0, r1, r2, r3};    \
 471         } while (0)
 472
 473 /*
 474  * arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call
 475  *
 476  * This is a variadic macro taking one to eight source arguments, and
 477  * an optional return structure.
 478  *
 479  * @a0-a7: arguments passed in registers 0 to 7
 480  * @res: result values from registers 0 to 3
 481  *
 482  * This macro is used to make SMC calls following SMC Calling Convention v1.1.
 483  * The content of the supplied param are copied to registers 0 to 7 prior
 484  * to the SMC instruction. The return values are updated with the content
 485  * from register 0 to 3 on return from the SMC instruction if not NULL.
 486  */
 487 #define arm_smccc_1_1_smc(...)  __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__)
 488
 489 /*
 490  * arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call
 491  *
 492  * This is a variadic macro taking one to eight source arguments, and
 493  * an optional return structure.
 494  *
 495  * @a0-a7: arguments passed in registers 0 to 7
 496  * @res: result values from registers 0 to 3
 497  *
 498  * This macro is used to make HVC calls following SMC Calling Convention v1.1.
 499  * The content of the supplied param are copied to registers 0 to 7 prior
 500  * to the HVC instruction. The return values are updated with the content
 501  * from register 0 to 3 on return from the HVC instruction if not NULL.
 502  */
 503 #define arm_smccc_1_1_hvc(...)  __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__)
 504
 505 /*
 506  * Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED.
 507  * Used when the SMCCC conduit is not defined. The empty asm statement
 508  * avoids compiler warnings about unused variables.
 509  */
 510 #define __fail_smccc_1_1(...)                                           \
 511         do {                                                            \
 512                 __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
 513                 asm ("" : __constraints(__count_args(__VA_ARGS__)));    \
 514                 if (___res)                                             \
 515                         ___res->a0 = SMCCC_RET_NOT_SUPPORTED;           \
 516         } while (0)
 517
 518 /*
 519  * arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call
 520  *
 521  * This is a variadic macro taking one to eight source arguments, and
 522  * an optional return structure.
 523  *
 524  * @a0-a7: arguments passed in registers 0 to 7
 525  * @res: result values from registers 0 to 3
 526  *
 527  * This macro will make either an HVC call or an SMC call depending on the
 528  * current SMCCC conduit. If no valid conduit is available then -1
 529  * (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied).
 530  *
 531  * The return value also provides the conduit that was used.
 532  */
 533 #define arm_smccc_1_1_invoke(...) ({                                    \
 534                 int method = arm_smccc_1_1_get_conduit();               \
 535                 switch (method) {                                       \
 536                 case SMCCC_CONDUIT_HVC:                                 \
 537                         arm_smccc_1_1_hvc(__VA_ARGS__);                 \
 538                         break;                                          \
 539                 case SMCCC_CONDUIT_SMC:                                 \
 540                         arm_smccc_1_1_smc(__VA_ARGS__);                 \
 541                         break;                                          \
 542                 default:                                                \
 543                         __fail_smccc_1_1(__VA_ARGS__);                  \
 544                         method = SMCCC_CONDUIT_NONE;                    \
 545                         break;                                          \
 546                 }                                                       \
 547                 method;                                                 \
 548         })
 549
 550 #endif /*__ASSEMBLY__*/
 551 #endif /*__LINUX_ARM_SMCCC_H*/