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