arch/x86/include/asm/xen/hypercall.h

   1 /******************************************************************************
   2  * hypercall.h
   3  *
   4  * Linux-specific hypervisor handling.
   5  *
   6  * Copyright (c) 2002-2004, K A Fraser
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License version 2
  10  * as published by the Free Software Foundation; or, when distributed
  11  * separately from the Linux kernel or incorporated into other
  12  * software packages, subject to the following license:
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a copy
  15  * of this source file (the "Software"), to deal in the Software without
  16  * restriction, including without limitation the rights to use, copy, modify,
  17  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
  18  * and to permit persons to whom the Software is furnished to do so, subject to
  19  * the following conditions:
  20  *
  21  * The above copyright notice and this permission notice shall be included in
  22  * all copies or substantial portions of the Software.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  27  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  28  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  29  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  30  * IN THE SOFTWARE.
  31  */
  32
  33 #ifndef _ASM_X86_XEN_HYPERCALL_H
  34 #define _ASM_X86_XEN_HYPERCALL_H
  35
  36 #include <linux/kernel.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/errno.h>
  39 #include <linux/string.h>
  40 #include <linux/types.h>
  41
  42 #include <asm/page.h>
  43 #include <asm/pgtable.h>
  44
  45 #include <xen/interface/xen.h>
  46 #include <xen/interface/sched.h>
  47 #include <xen/interface/physdev.h>
  48 #include <xen/interface/platform.h>
  49
  50 /*
  51  * The hypercall asms have to meet several constraints:
  52  * - Work on 32- and 64-bit.
  53  *    The two architectures put their arguments in different sets of
  54  *    registers.
  55  *
  56  * - Work around asm syntax quirks
  57  *    It isn't possible to specify one of the rNN registers in a
  58  *    constraint, so we use explicit register variables to get the
  59  *    args into the right place.
  60  *
  61  * - Mark all registers as potentially clobbered
  62  *    Even unused parameters can be clobbered by the hypervisor, so we
  63  *    need to make sure gcc knows it.
  64  *
  65  * - Avoid compiler bugs.
  66  *    This is the tricky part.  Because x86_32 has such a constrained
  67  *    register set, gcc versions below 4.3 have trouble generating
  68  *    code when all the arg registers and memory are trashed by the
  69  *    asm.  There are syntactically simpler ways of achieving the
  70  *    semantics below, but they cause the compiler to crash.
  71  *
  72  *    The only combination I found which works is:
  73  *     - assign the __argX variables first
  74  *     - list all actually used parameters as "+r" (__argX)
  75  *     - clobber the rest
  76  *
  77  * The result certainly isn't pretty, and it really shows up cpp's
  78  * weakness as as macro language.  Sorry.  (But let's just give thanks
  79  * there aren't more than 5 arguments...)
  80  */
  81
  82 extern struct { char _entry[32]; } hypercall_page[];
  83
  84 #define __HYPERCALL             "call hypercall_page+%c[offset]"
  85 #define __HYPERCALL_ENTRY(x)                                            \
  86         [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
  87
  88 #ifdef CONFIG_X86_32
  89 #define __HYPERCALL_RETREG      "eax"
  90 #define __HYPERCALL_ARG1REG     "ebx"
  91 #define __HYPERCALL_ARG2REG     "ecx"
  92 #define __HYPERCALL_ARG3REG     "edx"
  93 #define __HYPERCALL_ARG4REG     "esi"
  94 #define __HYPERCALL_ARG5REG     "edi"
  95 #else
  96 #define __HYPERCALL_RETREG      "rax"
  97 #define __HYPERCALL_ARG1REG     "rdi"
  98 #define __HYPERCALL_ARG2REG     "rsi"
  99 #define __HYPERCALL_ARG3REG     "rdx"
 100 #define __HYPERCALL_ARG4REG     "r10"
 101 #define __HYPERCALL_ARG5REG     "r8"
 102 #endif
 103
 104 #define __HYPERCALL_DECLS                                               \
 105         register unsigned long __res  asm(__HYPERCALL_RETREG);          \
 106         register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
 107         register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
 108         register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
 109         register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
 110         register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;
 111
 112 #define __HYPERCALL_0PARAM      "=r" (__res)
 113 #define __HYPERCALL_1PARAM      __HYPERCALL_0PARAM, "+r" (__arg1)
 114 #define __HYPERCALL_2PARAM      __HYPERCALL_1PARAM, "+r" (__arg2)
 115 #define __HYPERCALL_3PARAM      __HYPERCALL_2PARAM, "+r" (__arg3)
 116 #define __HYPERCALL_4PARAM      __HYPERCALL_3PARAM, "+r" (__arg4)
 117 #define __HYPERCALL_5PARAM      __HYPERCALL_4PARAM, "+r" (__arg5)
 118
 119 #define __HYPERCALL_0ARG()
 120 #define __HYPERCALL_1ARG(a1)                                            \
 121         __HYPERCALL_0ARG()              __arg1 = (unsigned long)(a1);
 122 #define __HYPERCALL_2ARG(a1,a2)                                         \
 123         __HYPERCALL_1ARG(a1)            __arg2 = (unsigned long)(a2);
 124 #define __HYPERCALL_3ARG(a1,a2,a3)                                      \
 125         __HYPERCALL_2ARG(a1,a2)         __arg3 = (unsigned long)(a3);
 126 #define __HYPERCALL_4ARG(a1,a2,a3,a4)                                   \
 127         __HYPERCALL_3ARG(a1,a2,a3)      __arg4 = (unsigned long)(a4);
 128 #define __HYPERCALL_5ARG(a1,a2,a3,a4,a5)                                \
 129         __HYPERCALL_4ARG(a1,a2,a3,a4)   __arg5 = (unsigned long)(a5);
 130
 131 #define __HYPERCALL_CLOBBER5    "memory"
 132 #define __HYPERCALL_CLOBBER4    __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
 133 #define __HYPERCALL_CLOBBER3    __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
 134 #define __HYPERCALL_CLOBBER2    __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
 135 #define __HYPERCALL_CLOBBER1    __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
 136 #define __HYPERCALL_CLOBBER0    __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
 137
 138 #define _hypercall0(type, name)                                         \
 139 ({                                                                      \
 140         __HYPERCALL_DECLS;                                              \
 141         __HYPERCALL_0ARG();                                             \
 142         asm volatile (__HYPERCALL                                       \
 143                       : __HYPERCALL_0PARAM                              \
 144                       : __HYPERCALL_ENTRY(name)                         \
 145                       : __HYPERCALL_CLOBBER0);                          \
 146         (type)__res;                                                    \
 147 })
 148
 149 #define _hypercall1(type, name, a1)                                     \
 150 ({                                                                      \
 151         __HYPERCALL_DECLS;                                              \
 152         __HYPERCALL_1ARG(a1);                                           \
 153         asm volatile (__HYPERCALL                                       \
 154                       : __HYPERCALL_1PARAM                              \
 155                       : __HYPERCALL_ENTRY(name)                         \
 156                       : __HYPERCALL_CLOBBER1);                          \
 157         (type)__res;                                                    \
 158 })
 159
 160 #define _hypercall2(type, name, a1, a2)                                 \
 161 ({                                                                      \
 162         __HYPERCALL_DECLS;                                              \
 163         __HYPERCALL_2ARG(a1, a2);                                       \
 164         asm volatile (__HYPERCALL                                       \
 165                       : __HYPERCALL_2PARAM                              \
 166                       : __HYPERCALL_ENTRY(name)                         \
 167                       : __HYPERCALL_CLOBBER2);                          \
 168         (type)__res;                                                    \
 169 })
 170
 171 #define _hypercall3(type, name, a1, a2, a3)                             \
 172 ({                                                                      \
 173         __HYPERCALL_DECLS;                                              \
 174         __HYPERCALL_3ARG(a1, a2, a3);                                   \
 175         asm volatile (__HYPERCALL                                       \
 176                       : __HYPERCALL_3PARAM                              \
 177                       : __HYPERCALL_ENTRY(name)                         \
 178                       : __HYPERCALL_CLOBBER3);                          \
 179         (type)__res;                                                    \
 180 })
 181
 182 #define _hypercall4(type, name, a1, a2, a3, a4)                         \
 183 ({                                                                      \
 184         __HYPERCALL_DECLS;                                              \
 185         __HYPERCALL_4ARG(a1, a2, a3, a4);                               \
 186         asm volatile (__HYPERCALL                                       \
 187                       : __HYPERCALL_4PARAM                              \
 188                       : __HYPERCALL_ENTRY(name)                         \
 189                       : __HYPERCALL_CLOBBER4);                          \
 190         (type)__res;                                                    \
 191 })
 192
 193 #define _hypercall5(type, name, a1, a2, a3, a4, a5)                     \
 194 ({                                                                      \
 195         __HYPERCALL_DECLS;                                              \
 196         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);                           \
 197         asm volatile (__HYPERCALL                                       \
 198                       : __HYPERCALL_5PARAM                              \
 199                       : __HYPERCALL_ENTRY(name)                         \
 200                       : __HYPERCALL_CLOBBER5);                          \
 201         (type)__res;                                                    \
 202 })
 203
 204 static inline long
 205 privcmd_call(unsigned call,
 206              unsigned long a1, unsigned long a2,
 207              unsigned long a3, unsigned long a4,
 208              unsigned long a5)
 209 {
 210         __HYPERCALL_DECLS;
 211         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);
 212
 213         asm volatile("call *%[call]"
 214                      : __HYPERCALL_5PARAM
 215                      : [call] "a" (&hypercall_page[call])
 216                      : __HYPERCALL_CLOBBER5);
 217
 218         return (long)__res;
 219 }
 220
 221 static inline int
 222 HYPERVISOR_set_trap_table(struct trap_info *table)
 223 {
 224         return _hypercall1(int, set_trap_table, table);
 225 }
 226
 227 static inline int
 228 HYPERVISOR_mmu_update(struct mmu_update *req, int count,
 229                       int *success_count, domid_t domid)
 230 {
 231         return _hypercall4(int, mmu_update, req, count, success_count, domid);
 232 }
 233
 234 static inline int
 235 HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
 236                      int *success_count, domid_t domid)
 237 {
 238         return _hypercall4(int, mmuext_op, op, count, success_count, domid);
 239 }
 240
 241 static inline int
 242 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
 243 {
 244         return _hypercall2(int, set_gdt, frame_list, entries);
 245 }
 246
 247 static inline int
 248 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
 249 {
 250         return _hypercall2(int, stack_switch, ss, esp);
 251 }
 252
 253 #ifdef CONFIG_X86_32
 254 static inline int
 255 HYPERVISOR_set_callbacks(unsigned long event_selector,
 256                          unsigned long event_address,
 257                          unsigned long failsafe_selector,
 258                          unsigned long failsafe_address)
 259 {
 260         return _hypercall4(int, set_callbacks,
 261                            event_selector, event_address,
 262                            failsafe_selector, failsafe_address);
 263 }
 264 #else  /* CONFIG_X86_64 */
 265 static inline int
 266 HYPERVISOR_set_callbacks(unsigned long event_address,
 267                         unsigned long failsafe_address,
 268                         unsigned long syscall_address)
 269 {
 270         return _hypercall3(int, set_callbacks,
 271                            event_address, failsafe_address,
 272                            syscall_address);
 273 }
 274 #endif  /* CONFIG_X86_{32,64} */
 275
 276 static inline int
 277 HYPERVISOR_callback_op(int cmd, void *arg)
 278 {
 279         return _hypercall2(int, callback_op, cmd, arg);
 280 }
 281
 282 static inline int
 283 HYPERVISOR_fpu_taskswitch(int set)
 284 {
 285         return _hypercall1(int, fpu_taskswitch, set);
 286 }
 287
 288 static inline int
 289 HYPERVISOR_sched_op(int cmd, void *arg)
 290 {
 291         return _hypercall2(int, sched_op, cmd, arg);
 292 }
 293
 294 static inline long
 295 HYPERVISOR_set_timer_op(u64 timeout)
 296 {
 297         unsigned long timeout_hi = (unsigned long)(timeout>>32);
 298         unsigned long timeout_lo = (unsigned long)timeout;
 299         return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
 300 }
 301
 302 static inline int
 303 HYPERVISOR_dom0_op(struct xen_platform_op *platform_op)
 304 {
 305         platform_op->interface_version = XENPF_INTERFACE_VERSION;
 306         return _hypercall1(int, dom0_op, platform_op);
 307 }
 308
 309 static inline int
 310 HYPERVISOR_set_debugreg(int reg, unsigned long value)
 311 {
 312         return _hypercall2(int, set_debugreg, reg, value);
 313 }
 314
 315 static inline unsigned long
 316 HYPERVISOR_get_debugreg(int reg)
 317 {
 318         return _hypercall1(unsigned long, get_debugreg, reg);
 319 }
 320
 321 static inline int
 322 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
 323 {
 324         if (sizeof(u64) == sizeof(long))
 325                 return _hypercall2(int, update_descriptor, ma, desc);
 326         return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
 327 }
 328
 329 static inline int
 330 HYPERVISOR_memory_op(unsigned int cmd, void *arg)
 331 {
 332         return _hypercall2(int, memory_op, cmd, arg);
 333 }
 334
 335 static inline int
 336 HYPERVISOR_multicall(void *call_list, int nr_calls)
 337 {
 338         return _hypercall2(int, multicall, call_list, nr_calls);
 339 }
 340
 341 static inline int
 342 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
 343                              unsigned long flags)
 344 {
 345         if (sizeof(new_val) == sizeof(long))
 346                 return _hypercall3(int, update_va_mapping, va,
 347                                    new_val.pte, flags);
 348         else
 349                 return _hypercall4(int, update_va_mapping, va,
 350                                    new_val.pte, new_val.pte >> 32, flags);
 351 }
 352
 353 static inline int
 354 HYPERVISOR_event_channel_op(int cmd, void *arg)
 355 {
 356         int rc = _hypercall2(int, event_channel_op, cmd, arg);
 357         if (unlikely(rc == -ENOSYS)) {
 358                 struct evtchn_op op;
 359                 op.cmd = cmd;
 360                 memcpy(&op.u, arg, sizeof(op.u));
 361                 rc = _hypercall1(int, event_channel_op_compat, &op);
 362                 memcpy(arg, &op.u, sizeof(op.u));
 363         }
 364         return rc;
 365 }
 366
 367 static inline int
 368 HYPERVISOR_xen_version(int cmd, void *arg)
 369 {
 370         return _hypercall2(int, xen_version, cmd, arg);
 371 }
 372
 373 static inline int
 374 HYPERVISOR_console_io(int cmd, int count, char *str)
 375 {
 376         return _hypercall3(int, console_io, cmd, count, str);
 377 }
 378
 379 static inline int
 380 HYPERVISOR_physdev_op(int cmd, void *arg)
 381 {
 382         int rc = _hypercall2(int, physdev_op, cmd, arg);
 383         if (unlikely(rc == -ENOSYS)) {
 384                 struct physdev_op op;
 385                 op.cmd = cmd;
 386                 memcpy(&op.u, arg, sizeof(op.u));
 387                 rc = _hypercall1(int, physdev_op_compat, &op);
 388                 memcpy(arg, &op.u, sizeof(op.u));
 389         }
 390         return rc;
 391 }
 392
 393 static inline int
 394 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
 395 {
 396         return _hypercall3(int, grant_table_op, cmd, uop, count);
 397 }
 398
 399 static inline int
 400 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
 401                                          unsigned long flags, domid_t domid)
 402 {
 403         if (sizeof(new_val) == sizeof(long))
 404                 return _hypercall4(int, update_va_mapping_otherdomain, va,
 405                                    new_val.pte, flags, domid);
 406         else
 407                 return _hypercall5(int, update_va_mapping_otherdomain, va,
 408                                    new_val.pte, new_val.pte >> 32,
 409                                    flags, domid);
 410 }
 411
 412 static inline int
 413 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
 414 {
 415         return _hypercall2(int, vm_assist, cmd, type);
 416 }
 417
 418 static inline int
 419 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
 420 {
 421         return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
 422 }
 423
 424 #ifdef CONFIG_X86_64
 425 static inline int
 426 HYPERVISOR_set_segment_base(int reg, unsigned long value)
 427 {
 428         return _hypercall2(int, set_segment_base, reg, value);
 429 }
 430 #endif
 431
 432 static inline int
 433 HYPERVISOR_suspend(unsigned long start_info_mfn)
 434 {
 435         struct sched_shutdown r = { .reason = SHUTDOWN_suspend };
 436
 437         /*
 438          * For a PV guest the tools require that the start_info mfn be
 439          * present in rdx/edx when the hypercall is made. Per the
 440          * hypercall calling convention this is the third hypercall
 441          * argument, which is start_info_mfn here.
 442          */
 443         return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
 444 }
 445
 446 static inline int
 447 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
 448 {
 449         return _hypercall2(int, nmi_op, op, arg);
 450 }
 451
 452 static inline unsigned long __must_check
 453 HYPERVISOR_hvm_op(int op, void *arg)
 454 {
 455        return _hypercall2(unsigned long, hvm_op, op, arg);
 456 }
 457
 458 static inline int
 459 HYPERVISOR_tmem_op(
 460         struct tmem_op *op)
 461 {
 462         return _hypercall1(int, tmem_op, op);
 463 }
 464
 465 static inline void
 466 MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
 467 {
 468         mcl->op = __HYPERVISOR_fpu_taskswitch;
 469         mcl->args[0] = set;
 470 }
 471
 472 static inline void
 473 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
 474                         pte_t new_val, unsigned long flags)
 475 {
 476         mcl->op = __HYPERVISOR_update_va_mapping;
 477         mcl->args[0] = va;
 478         if (sizeof(new_val) == sizeof(long)) {
 479                 mcl->args[1] = new_val.pte;
 480                 mcl->args[2] = flags;
 481         } else {
 482                 mcl->args[1] = new_val.pte;
 483                 mcl->args[2] = new_val.pte >> 32;
 484                 mcl->args[3] = flags;
 485         }
 486 }
 487
 488 static inline void
 489 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
 490                      void *uop, unsigned int count)
 491 {
 492         mcl->op = __HYPERVISOR_grant_table_op;
 493         mcl->args[0] = cmd;
 494         mcl->args[1] = (unsigned long)uop;
 495         mcl->args[2] = count;
 496 }
 497
 498 static inline void
 499 MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
 500                                     pte_t new_val, unsigned long flags,
 501                                     domid_t domid)
 502 {
 503         mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
 504         mcl->args[0] = va;
 505         if (sizeof(new_val) == sizeof(long)) {
 506                 mcl->args[1] = new_val.pte;
 507                 mcl->args[2] = flags;
 508                 mcl->args[3] = domid;
 509         } else {
 510                 mcl->args[1] = new_val.pte;
 511                 mcl->args[2] = new_val.pte >> 32;
 512                 mcl->args[3] = flags;
 513                 mcl->args[4] = domid;
 514         }
 515 }
 516
 517 static inline void
 518 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
 519                         struct desc_struct desc)
 520 {
 521         mcl->op = __HYPERVISOR_update_descriptor;
 522         if (sizeof(maddr) == sizeof(long)) {
 523                 mcl->args[0] = maddr;
 524                 mcl->args[1] = *(unsigned long *)&desc;
 525         } else {
 526                 mcl->args[0] = maddr;
 527                 mcl->args[1] = maddr >> 32;
 528                 mcl->args[2] = desc.a;
 529                 mcl->args[3] = desc.b;
 530         }
 531 }
 532
 533 static inline void
 534 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
 535 {
 536         mcl->op = __HYPERVISOR_memory_op;
 537         mcl->args[0] = cmd;
 538         mcl->args[1] = (unsigned long)arg;
 539 }
 540
 541 static inline void
 542 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
 543                  int count, int *success_count, domid_t domid)
 544 {
 545         mcl->op = __HYPERVISOR_mmu_update;
 546         mcl->args[0] = (unsigned long)req;
 547         mcl->args[1] = count;
 548         mcl->args[2] = (unsigned long)success_count;
 549         mcl->args[3] = domid;
 550 }
 551
 552 static inline void
 553 MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
 554                 int *success_count, domid_t domid)
 555 {
 556         mcl->op = __HYPERVISOR_mmuext_op;
 557         mcl->args[0] = (unsigned long)op;
 558         mcl->args[1] = count;
 559         mcl->args[2] = (unsigned long)success_count;
 560         mcl->args[3] = domid;
 561 }
 562
 563 static inline void
 564 MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
 565 {
 566         mcl->op = __HYPERVISOR_set_gdt;
 567         mcl->args[0] = (unsigned long)frames;
 568         mcl->args[1] = entries;
 569 }
 570
 571 static inline void
 572 MULTI_stack_switch(struct multicall_entry *mcl,
 573                    unsigned long ss, unsigned long esp)
 574 {
 575         mcl->op = __HYPERVISOR_stack_switch;
 576         mcl->args[0] = ss;
 577         mcl->args[1] = esp;
 578 }
 579
 580 #endif /* _ASM_X86_XEN_HYPERCALL_H */