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TOMOYO Linux Cross Reference
Linux/arch/x86/include/asm/xen/hypercall.h

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  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 <trace/events/xen.h>
 43 
 44 #include <asm/page.h>
 45 #include <asm/pgtable.h>
 46 
 47 #include <xen/interface/xen.h>
 48 #include <xen/interface/sched.h>
 49 #include <xen/interface/physdev.h>
 50 #include <xen/interface/platform.h>
 51 #include <xen/interface/xen-mca.h>
 52 
 53 /*
 54  * The hypercall asms have to meet several constraints:
 55  * - Work on 32- and 64-bit.
 56  *    The two architectures put their arguments in different sets of
 57  *    registers.
 58  *
 59  * - Work around asm syntax quirks
 60  *    It isn't possible to specify one of the rNN registers in a
 61  *    constraint, so we use explicit register variables to get the
 62  *    args into the right place.
 63  *
 64  * - Mark all registers as potentially clobbered
 65  *    Even unused parameters can be clobbered by the hypervisor, so we
 66  *    need to make sure gcc knows it.
 67  *
 68  * - Avoid compiler bugs.
 69  *    This is the tricky part.  Because x86_32 has such a constrained
 70  *    register set, gcc versions below 4.3 have trouble generating
 71  *    code when all the arg registers and memory are trashed by the
 72  *    asm.  There are syntactically simpler ways of achieving the
 73  *    semantics below, but they cause the compiler to crash.
 74  *
 75  *    The only combination I found which works is:
 76  *     - assign the __argX variables first
 77  *     - list all actually used parameters as "+r" (__argX)
 78  *     - clobber the rest
 79  *
 80  * The result certainly isn't pretty, and it really shows up cpp's
 81  * weakness as as macro language.  Sorry.  (But let's just give thanks
 82  * there aren't more than 5 arguments...)
 83  */
 84 
 85 extern struct { char _entry[32]; } hypercall_page[];
 86 
 87 #define __HYPERCALL             "call hypercall_page+%c[offset]"
 88 #define __HYPERCALL_ENTRY(x)                                            \
 89         [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
 90 
 91 #ifdef CONFIG_X86_32
 92 #define __HYPERCALL_RETREG      "eax"
 93 #define __HYPERCALL_ARG1REG     "ebx"
 94 #define __HYPERCALL_ARG2REG     "ecx"
 95 #define __HYPERCALL_ARG3REG     "edx"
 96 #define __HYPERCALL_ARG4REG     "esi"
 97 #define __HYPERCALL_ARG5REG     "edi"
 98 #else
 99 #define __HYPERCALL_RETREG      "rax"
100 #define __HYPERCALL_ARG1REG     "rdi"
101 #define __HYPERCALL_ARG2REG     "rsi"
102 #define __HYPERCALL_ARG3REG     "rdx"
103 #define __HYPERCALL_ARG4REG     "r10"
104 #define __HYPERCALL_ARG5REG     "r8"
105 #endif
106 
107 #define __HYPERCALL_DECLS                                               \
108         register unsigned long __res  asm(__HYPERCALL_RETREG);          \
109         register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
110         register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
111         register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
112         register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
113         register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;
114 
115 #define __HYPERCALL_0PARAM      "=r" (__res)
116 #define __HYPERCALL_1PARAM      __HYPERCALL_0PARAM, "+r" (__arg1)
117 #define __HYPERCALL_2PARAM      __HYPERCALL_1PARAM, "+r" (__arg2)
118 #define __HYPERCALL_3PARAM      __HYPERCALL_2PARAM, "+r" (__arg3)
119 #define __HYPERCALL_4PARAM      __HYPERCALL_3PARAM, "+r" (__arg4)
120 #define __HYPERCALL_5PARAM      __HYPERCALL_4PARAM, "+r" (__arg5)
121 
122 #define __HYPERCALL_0ARG()
123 #define __HYPERCALL_1ARG(a1)                                            \
124         __HYPERCALL_0ARG()              __arg1 = (unsigned long)(a1);
125 #define __HYPERCALL_2ARG(a1,a2)                                         \
126         __HYPERCALL_1ARG(a1)            __arg2 = (unsigned long)(a2);
127 #define __HYPERCALL_3ARG(a1,a2,a3)                                      \
128         __HYPERCALL_2ARG(a1,a2)         __arg3 = (unsigned long)(a3);
129 #define __HYPERCALL_4ARG(a1,a2,a3,a4)                                   \
130         __HYPERCALL_3ARG(a1,a2,a3)      __arg4 = (unsigned long)(a4);
131 #define __HYPERCALL_5ARG(a1,a2,a3,a4,a5)                                \
132         __HYPERCALL_4ARG(a1,a2,a3,a4)   __arg5 = (unsigned long)(a5);
133 
134 #define __HYPERCALL_CLOBBER5    "memory"
135 #define __HYPERCALL_CLOBBER4    __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
136 #define __HYPERCALL_CLOBBER3    __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
137 #define __HYPERCALL_CLOBBER2    __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
138 #define __HYPERCALL_CLOBBER1    __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
139 #define __HYPERCALL_CLOBBER0    __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
140 
141 #define _hypercall0(type, name)                                         \
142 ({                                                                      \
143         __HYPERCALL_DECLS;                                              \
144         __HYPERCALL_0ARG();                                             \
145         asm volatile (__HYPERCALL                                       \
146                       : __HYPERCALL_0PARAM                              \
147                       : __HYPERCALL_ENTRY(name)                         \
148                       : __HYPERCALL_CLOBBER0);                          \
149         (type)__res;                                                    \
150 })
151 
152 #define _hypercall1(type, name, a1)                                     \
153 ({                                                                      \
154         __HYPERCALL_DECLS;                                              \
155         __HYPERCALL_1ARG(a1);                                           \
156         asm volatile (__HYPERCALL                                       \
157                       : __HYPERCALL_1PARAM                              \
158                       : __HYPERCALL_ENTRY(name)                         \
159                       : __HYPERCALL_CLOBBER1);                          \
160         (type)__res;                                                    \
161 })
162 
163 #define _hypercall2(type, name, a1, a2)                                 \
164 ({                                                                      \
165         __HYPERCALL_DECLS;                                              \
166         __HYPERCALL_2ARG(a1, a2);                                       \
167         asm volatile (__HYPERCALL                                       \
168                       : __HYPERCALL_2PARAM                              \
169                       : __HYPERCALL_ENTRY(name)                         \
170                       : __HYPERCALL_CLOBBER2);                          \
171         (type)__res;                                                    \
172 })
173 
174 #define _hypercall3(type, name, a1, a2, a3)                             \
175 ({                                                                      \
176         __HYPERCALL_DECLS;                                              \
177         __HYPERCALL_3ARG(a1, a2, a3);                                   \
178         asm volatile (__HYPERCALL                                       \
179                       : __HYPERCALL_3PARAM                              \
180                       : __HYPERCALL_ENTRY(name)                         \
181                       : __HYPERCALL_CLOBBER3);                          \
182         (type)__res;                                                    \
183 })
184 
185 #define _hypercall4(type, name, a1, a2, a3, a4)                         \
186 ({                                                                      \
187         __HYPERCALL_DECLS;                                              \
188         __HYPERCALL_4ARG(a1, a2, a3, a4);                               \
189         asm volatile (__HYPERCALL                                       \
190                       : __HYPERCALL_4PARAM                              \
191                       : __HYPERCALL_ENTRY(name)                         \
192                       : __HYPERCALL_CLOBBER4);                          \
193         (type)__res;                                                    \
194 })
195 
196 #define _hypercall5(type, name, a1, a2, a3, a4, a5)                     \
197 ({                                                                      \
198         __HYPERCALL_DECLS;                                              \
199         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);                           \
200         asm volatile (__HYPERCALL                                       \
201                       : __HYPERCALL_5PARAM                              \
202                       : __HYPERCALL_ENTRY(name)                         \
203                       : __HYPERCALL_CLOBBER5);                          \
204         (type)__res;                                                    \
205 })
206 
207 static inline long
208 privcmd_call(unsigned call,
209              unsigned long a1, unsigned long a2,
210              unsigned long a3, unsigned long a4,
211              unsigned long a5)
212 {
213         __HYPERCALL_DECLS;
214         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);
215 
216         asm volatile("call *%[call]"
217                      : __HYPERCALL_5PARAM
218                      : [call] "a" (&hypercall_page[call])
219                      : __HYPERCALL_CLOBBER5);
220 
221         return (long)__res;
222 }
223 
224 static inline int
225 HYPERVISOR_set_trap_table(struct trap_info *table)
226 {
227         return _hypercall1(int, set_trap_table, table);
228 }
229 
230 static inline int
231 HYPERVISOR_mmu_update(struct mmu_update *req, int count,
232                       int *success_count, domid_t domid)
233 {
234         return _hypercall4(int, mmu_update, req, count, success_count, domid);
235 }
236 
237 static inline int
238 HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
239                      int *success_count, domid_t domid)
240 {
241         return _hypercall4(int, mmuext_op, op, count, success_count, domid);
242 }
243 
244 static inline int
245 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
246 {
247         return _hypercall2(int, set_gdt, frame_list, entries);
248 }
249 
250 static inline int
251 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
252 {
253         return _hypercall2(int, stack_switch, ss, esp);
254 }
255 
256 #ifdef CONFIG_X86_32
257 static inline int
258 HYPERVISOR_set_callbacks(unsigned long event_selector,
259                          unsigned long event_address,
260                          unsigned long failsafe_selector,
261                          unsigned long failsafe_address)
262 {
263         return _hypercall4(int, set_callbacks,
264                            event_selector, event_address,
265                            failsafe_selector, failsafe_address);
266 }
267 #else  /* CONFIG_X86_64 */
268 static inline int
269 HYPERVISOR_set_callbacks(unsigned long event_address,
270                         unsigned long failsafe_address,
271                         unsigned long syscall_address)
272 {
273         return _hypercall3(int, set_callbacks,
274                            event_address, failsafe_address,
275                            syscall_address);
276 }
277 #endif  /* CONFIG_X86_{32,64} */
278 
279 static inline int
280 HYPERVISOR_callback_op(int cmd, void *arg)
281 {
282         return _hypercall2(int, callback_op, cmd, arg);
283 }
284 
285 static inline int
286 HYPERVISOR_fpu_taskswitch(int set)
287 {
288         return _hypercall1(int, fpu_taskswitch, set);
289 }
290 
291 static inline int
292 HYPERVISOR_sched_op(int cmd, void *arg)
293 {
294         return _hypercall2(int, sched_op, cmd, arg);
295 }
296 
297 static inline long
298 HYPERVISOR_set_timer_op(u64 timeout)
299 {
300         unsigned long timeout_hi = (unsigned long)(timeout>>32);
301         unsigned long timeout_lo = (unsigned long)timeout;
302         return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
303 }
304 
305 static inline int
306 HYPERVISOR_mca(struct xen_mc *mc_op)
307 {
308         mc_op->interface_version = XEN_MCA_INTERFACE_VERSION;
309         return _hypercall1(int, mca, mc_op);
310 }
311 
312 static inline int
313 HYPERVISOR_dom0_op(struct xen_platform_op *platform_op)
314 {
315         platform_op->interface_version = XENPF_INTERFACE_VERSION;
316         return _hypercall1(int, dom0_op, platform_op);
317 }
318 
319 static inline int
320 HYPERVISOR_set_debugreg(int reg, unsigned long value)
321 {
322         return _hypercall2(int, set_debugreg, reg, value);
323 }
324 
325 static inline unsigned long
326 HYPERVISOR_get_debugreg(int reg)
327 {
328         return _hypercall1(unsigned long, get_debugreg, reg);
329 }
330 
331 static inline int
332 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
333 {
334         if (sizeof(u64) == sizeof(long))
335                 return _hypercall2(int, update_descriptor, ma, desc);
336         return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
337 }
338 
339 static inline int
340 HYPERVISOR_memory_op(unsigned int cmd, void *arg)
341 {
342         return _hypercall2(int, memory_op, cmd, arg);
343 }
344 
345 static inline int
346 HYPERVISOR_multicall(void *call_list, uint32_t nr_calls)
347 {
348         return _hypercall2(int, multicall, call_list, nr_calls);
349 }
350 
351 static inline int
352 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
353                              unsigned long flags)
354 {
355         if (sizeof(new_val) == sizeof(long))
356                 return _hypercall3(int, update_va_mapping, va,
357                                    new_val.pte, flags);
358         else
359                 return _hypercall4(int, update_va_mapping, va,
360                                    new_val.pte, new_val.pte >> 32, flags);
361 }
362 extern int __must_check xen_event_channel_op_compat(int, void *);
363 
364 static inline int
365 HYPERVISOR_event_channel_op(int cmd, void *arg)
366 {
367         int rc = _hypercall2(int, event_channel_op, cmd, arg);
368         if (unlikely(rc == -ENOSYS))
369                 rc = xen_event_channel_op_compat(cmd, arg);
370         return rc;
371 }
372 
373 static inline int
374 HYPERVISOR_xen_version(int cmd, void *arg)
375 {
376         return _hypercall2(int, xen_version, cmd, arg);
377 }
378 
379 static inline int
380 HYPERVISOR_console_io(int cmd, int count, char *str)
381 {
382         return _hypercall3(int, console_io, cmd, count, str);
383 }
384 
385 extern int __must_check xen_physdev_op_compat(int, void *);
386 
387 static inline int
388 HYPERVISOR_physdev_op(int cmd, void *arg)
389 {
390         int rc = _hypercall2(int, physdev_op, cmd, arg);
391         if (unlikely(rc == -ENOSYS))
392                 rc = xen_physdev_op_compat(cmd, arg);
393         return rc;
394 }
395 
396 static inline int
397 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
398 {
399         return _hypercall3(int, grant_table_op, cmd, uop, count);
400 }
401 
402 static inline int
403 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
404                                          unsigned long flags, domid_t domid)
405 {
406         if (sizeof(new_val) == sizeof(long))
407                 return _hypercall4(int, update_va_mapping_otherdomain, va,
408                                    new_val.pte, flags, domid);
409         else
410                 return _hypercall5(int, update_va_mapping_otherdomain, va,
411                                    new_val.pte, new_val.pte >> 32,
412                                    flags, domid);
413 }
414 
415 static inline int
416 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
417 {
418         return _hypercall2(int, vm_assist, cmd, type);
419 }
420 
421 static inline int
422 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
423 {
424         return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
425 }
426 
427 #ifdef CONFIG_X86_64
428 static inline int
429 HYPERVISOR_set_segment_base(int reg, unsigned long value)
430 {
431         return _hypercall2(int, set_segment_base, reg, value);
432 }
433 #endif
434 
435 static inline int
436 HYPERVISOR_suspend(unsigned long start_info_mfn)
437 {
438         struct sched_shutdown r = { .reason = SHUTDOWN_suspend };
439 
440         /*
441          * For a PV guest the tools require that the start_info mfn be
442          * present in rdx/edx when the hypercall is made. Per the
443          * hypercall calling convention this is the third hypercall
444          * argument, which is start_info_mfn here.
445          */
446         return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
447 }
448 
449 static inline int
450 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
451 {
452         return _hypercall2(int, nmi_op, op, arg);
453 }
454 
455 static inline unsigned long __must_check
456 HYPERVISOR_hvm_op(int op, void *arg)
457 {
458        return _hypercall2(unsigned long, hvm_op, op, arg);
459 }
460 
461 static inline int
462 HYPERVISOR_tmem_op(
463         struct tmem_op *op)
464 {
465         return _hypercall1(int, tmem_op, op);
466 }
467 
468 static inline void
469 MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
470 {
471         mcl->op = __HYPERVISOR_fpu_taskswitch;
472         mcl->args[0] = set;
473 
474         trace_xen_mc_entry(mcl, 1);
475 }
476 
477 static inline void
478 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
479                         pte_t new_val, unsigned long flags)
480 {
481         mcl->op = __HYPERVISOR_update_va_mapping;
482         mcl->args[0] = va;
483         if (sizeof(new_val) == sizeof(long)) {
484                 mcl->args[1] = new_val.pte;
485                 mcl->args[2] = flags;
486         } else {
487                 mcl->args[1] = new_val.pte;
488                 mcl->args[2] = new_val.pte >> 32;
489                 mcl->args[3] = flags;
490         }
491 
492         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 3 : 4);
493 }
494 
495 static inline void
496 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
497                      void *uop, unsigned int count)
498 {
499         mcl->op = __HYPERVISOR_grant_table_op;
500         mcl->args[0] = cmd;
501         mcl->args[1] = (unsigned long)uop;
502         mcl->args[2] = count;
503 
504         trace_xen_mc_entry(mcl, 3);
505 }
506 
507 static inline void
508 MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
509                                     pte_t new_val, unsigned long flags,
510                                     domid_t domid)
511 {
512         mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
513         mcl->args[0] = va;
514         if (sizeof(new_val) == sizeof(long)) {
515                 mcl->args[1] = new_val.pte;
516                 mcl->args[2] = flags;
517                 mcl->args[3] = domid;
518         } else {
519                 mcl->args[1] = new_val.pte;
520                 mcl->args[2] = new_val.pte >> 32;
521                 mcl->args[3] = flags;
522                 mcl->args[4] = domid;
523         }
524 
525         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 4 : 5);
526 }
527 
528 static inline void
529 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
530                         struct desc_struct desc)
531 {
532         mcl->op = __HYPERVISOR_update_descriptor;
533         if (sizeof(maddr) == sizeof(long)) {
534                 mcl->args[0] = maddr;
535                 mcl->args[1] = *(unsigned long *)&desc;
536         } else {
537                 mcl->args[0] = maddr;
538                 mcl->args[1] = maddr >> 32;
539                 mcl->args[2] = desc.a;
540                 mcl->args[3] = desc.b;
541         }
542 
543         trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4);
544 }
545 
546 static inline void
547 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
548 {
549         mcl->op = __HYPERVISOR_memory_op;
550         mcl->args[0] = cmd;
551         mcl->args[1] = (unsigned long)arg;
552 
553         trace_xen_mc_entry(mcl, 2);
554 }
555 
556 static inline void
557 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
558                  int count, int *success_count, domid_t domid)
559 {
560         mcl->op = __HYPERVISOR_mmu_update;
561         mcl->args[0] = (unsigned long)req;
562         mcl->args[1] = count;
563         mcl->args[2] = (unsigned long)success_count;
564         mcl->args[3] = domid;
565 
566         trace_xen_mc_entry(mcl, 4);
567 }
568 
569 static inline void
570 MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
571                 int *success_count, domid_t domid)
572 {
573         mcl->op = __HYPERVISOR_mmuext_op;
574         mcl->args[0] = (unsigned long)op;
575         mcl->args[1] = count;
576         mcl->args[2] = (unsigned long)success_count;
577         mcl->args[3] = domid;
578 
579         trace_xen_mc_entry(mcl, 4);
580 }
581 
582 static inline void
583 MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
584 {
585         mcl->op = __HYPERVISOR_set_gdt;
586         mcl->args[0] = (unsigned long)frames;
587         mcl->args[1] = entries;
588 
589         trace_xen_mc_entry(mcl, 2);
590 }
591 
592 static inline void
593 MULTI_stack_switch(struct multicall_entry *mcl,
594                    unsigned long ss, unsigned long esp)
595 {
596         mcl->op = __HYPERVISOR_stack_switch;
597         mcl->args[0] = ss;
598         mcl->args[1] = esp;
599 
600         trace_xen_mc_entry(mcl, 2);
601 }
602 
603 #endif /* _ASM_X86_XEN_HYPERCALL_H */
604 

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