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x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / arch / x86 / include / asm / xen / hypercall.h
blob9c371e4a9fa6e122a25b6cf745fde11b027ba313
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
49 /*
50 * The hypercall asms have to meet several constraints:
51 * - Work on 32- and 64-bit.
52 * The two architectures put their arguments in different sets of
53 * registers.
54 *
55 * - Work around asm syntax quirks
56 * It isn't possible to specify one of the rNN registers in a
57 * constraint, so we use explicit register variables to get the
58 * args into the right place.
59 *
60 * - Mark all registers as potentially clobbered
61 * Even unused parameters can be clobbered by the hypervisor, so we
62 * need to make sure gcc knows it.
63 *
64 * - Avoid compiler bugs.
65 * This is the tricky part. Because x86_32 has such a constrained
66 * register set, gcc versions below 4.3 have trouble generating
67 * code when all the arg registers and memory are trashed by the
68 * asm. There are syntactically simpler ways of achieving the
69 * semantics below, but they cause the compiler to crash.
70 *
71 * The only combination I found which works is:
72 * - assign the __argX variables first
73 * - list all actually used parameters as "+r" (__argX)
74 * - clobber the rest
75 *
76 * The result certainly isn't pretty, and it really shows up cpp's
77 * weakness as as macro language. Sorry. (But let's just give thanks
78 * there aren't more than 5 arguments...)
79 */
80
81 extern struct { char _entry[32]; } hypercall_page[];
82
83 #define __HYPERCALL "call hypercall_page+%c[offset]"
84 #define __HYPERCALL_ENTRY(x) \
85 [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
86
87 #ifdef CONFIG_X86_32
88 #define __HYPERCALL_RETREG "eax"
89 #define __HYPERCALL_ARG1REG "ebx"
90 #define __HYPERCALL_ARG2REG "ecx"
91 #define __HYPERCALL_ARG3REG "edx"
92 #define __HYPERCALL_ARG4REG "esi"
93 #define __HYPERCALL_ARG5REG "edi"
94 #else
95 #define __HYPERCALL_RETREG "rax"
96 #define __HYPERCALL_ARG1REG "rdi"
97 #define __HYPERCALL_ARG2REG "rsi"
98 #define __HYPERCALL_ARG3REG "rdx"
99 #define __HYPERCALL_ARG4REG "r10"
100 #define __HYPERCALL_ARG5REG "r8"
101 #endif
102
103 #define __HYPERCALL_DECLS \
104 register unsigned long __res asm(__HYPERCALL_RETREG); \
105 register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
106 register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
107 register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
108 register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
109 register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;
110
111 #define __HYPERCALL_0PARAM "=r" (__res)
112 #define __HYPERCALL_1PARAM __HYPERCALL_0PARAM, "+r" (__arg1)
113 #define __HYPERCALL_2PARAM __HYPERCALL_1PARAM, "+r" (__arg2)
114 #define __HYPERCALL_3PARAM __HYPERCALL_2PARAM, "+r" (__arg3)
115 #define __HYPERCALL_4PARAM __HYPERCALL_3PARAM, "+r" (__arg4)
116 #define __HYPERCALL_5PARAM __HYPERCALL_4PARAM, "+r" (__arg5)
117
118 #define __HYPERCALL_0ARG()
119 #define __HYPERCALL_1ARG(a1) \
120 __HYPERCALL_0ARG() __arg1 = (unsigned long)(a1);
121 #define __HYPERCALL_2ARG(a1,a2) \
122 __HYPERCALL_1ARG(a1) __arg2 = (unsigned long)(a2);
123 #define __HYPERCALL_3ARG(a1,a2,a3) \
124 __HYPERCALL_2ARG(a1,a2) __arg3 = (unsigned long)(a3);
125 #define __HYPERCALL_4ARG(a1,a2,a3,a4) \
126 __HYPERCALL_3ARG(a1,a2,a3) __arg4 = (unsigned long)(a4);
127 #define __HYPERCALL_5ARG(a1,a2,a3,a4,a5) \
128 __HYPERCALL_4ARG(a1,a2,a3,a4) __arg5 = (unsigned long)(a5);
129
130 #define __HYPERCALL_CLOBBER5 "memory"
131 #define __HYPERCALL_CLOBBER4 __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
132 #define __HYPERCALL_CLOBBER3 __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
133 #define __HYPERCALL_CLOBBER2 __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
134 #define __HYPERCALL_CLOBBER1 __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
135 #define __HYPERCALL_CLOBBER0 __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
136
137 #define _hypercall0(type, name) \
138 ({ \
139 __HYPERCALL_DECLS; \
140 __HYPERCALL_0ARG(); \
141 asm volatile (__HYPERCALL \
142 : __HYPERCALL_0PARAM \
143 : __HYPERCALL_ENTRY(name) \
144 : __HYPERCALL_CLOBBER0); \
145 (type)__res; \
146 })
147
148 #define _hypercall1(type, name, a1) \
149 ({ \
150 __HYPERCALL_DECLS; \
151 __HYPERCALL_1ARG(a1); \
152 asm volatile (__HYPERCALL \
153 : __HYPERCALL_1PARAM \
154 : __HYPERCALL_ENTRY(name) \
155 : __HYPERCALL_CLOBBER1); \
156 (type)__res; \
157 })
158
159 #define _hypercall2(type, name, a1, a2) \
160 ({ \
161 __HYPERCALL_DECLS; \
162 __HYPERCALL_2ARG(a1, a2); \
163 asm volatile (__HYPERCALL \
164 : __HYPERCALL_2PARAM \
165 : __HYPERCALL_ENTRY(name) \
166 : __HYPERCALL_CLOBBER2); \
167 (type)__res; \
168 })
169
170 #define _hypercall3(type, name, a1, a2, a3) \
171 ({ \
172 __HYPERCALL_DECLS; \
173 __HYPERCALL_3ARG(a1, a2, a3); \
174 asm volatile (__HYPERCALL \
175 : __HYPERCALL_3PARAM \
176 : __HYPERCALL_ENTRY(name) \
177 : __HYPERCALL_CLOBBER3); \
178 (type)__res; \
179 })
180
181 #define _hypercall4(type, name, a1, a2, a3, a4) \
182 ({ \
183 __HYPERCALL_DECLS; \
184 __HYPERCALL_4ARG(a1, a2, a3, a4); \
185 asm volatile (__HYPERCALL \
186 : __HYPERCALL_4PARAM \
187 : __HYPERCALL_ENTRY(name) \
188 : __HYPERCALL_CLOBBER4); \
189 (type)__res; \
190 })
191
192 #define _hypercall5(type, name, a1, a2, a3, a4, a5) \
193 ({ \
194 __HYPERCALL_DECLS; \
195 __HYPERCALL_5ARG(a1, a2, a3, a4, a5); \
196 asm volatile (__HYPERCALL \
197 : __HYPERCALL_5PARAM \
198 : __HYPERCALL_ENTRY(name) \
199 : __HYPERCALL_CLOBBER5); \
200 (type)__res; \
201 })
202
203 static inline int
204 HYPERVISOR_set_trap_table(struct trap_info *table)
205 {
206 return _hypercall1(int, set_trap_table, table);
207 }
208
209 static inline int
210 HYPERVISOR_mmu_update(struct mmu_update *req, int count,
211 int *success_count, domid_t domid)
212 {
213 return _hypercall4(int, mmu_update, req, count, success_count, domid);
214 }
215
216 static inline int
217 HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
218 int *success_count, domid_t domid)
219 {
220 return _hypercall4(int, mmuext_op, op, count, success_count, domid);
221 }
222
223 static inline int
224 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
225 {
226 return _hypercall2(int, set_gdt, frame_list, entries);
227 }
228
229 static inline int
230 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
231 {
232 return _hypercall2(int, stack_switch, ss, esp);
233 }
234
235 #ifdef CONFIG_X86_32
236 static inline int
237 HYPERVISOR_set_callbacks(unsigned long event_selector,
238 unsigned long event_address,
239 unsigned long failsafe_selector,
240 unsigned long failsafe_address)
241 {
242 return _hypercall4(int, set_callbacks,
243 event_selector, event_address,
244 failsafe_selector, failsafe_address);
245 }
246 #else /* CONFIG_X86_64 */
247 static inline int
248 HYPERVISOR_set_callbacks(unsigned long event_address,
249 unsigned long failsafe_address,
250 unsigned long syscall_address)
251 {
252 return _hypercall3(int, set_callbacks,
253 event_address, failsafe_address,
254 syscall_address);
255 }
256 #endif /* CONFIG_X86_{32,64} */
257
258 static inline int
259 HYPERVISOR_callback_op(int cmd, void *arg)
260 {
261 return _hypercall2(int, callback_op, cmd, arg);
262 }
263
264 static inline int
265 HYPERVISOR_fpu_taskswitch(int set)
266 {
267 return _hypercall1(int, fpu_taskswitch, set);
268 }
269
270 static inline int
271 HYPERVISOR_sched_op(int cmd, void *arg)
272 {
273 return _hypercall2(int, sched_op_new, cmd, arg);
274 }
275
276 static inline long
277 HYPERVISOR_set_timer_op(u64 timeout)
278 {
279 unsigned long timeout_hi = (unsigned long)(timeout>>32);
280 unsigned long timeout_lo = (unsigned long)timeout;
281 return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
282 }
283
284 static inline int
285 HYPERVISOR_set_debugreg(int reg, unsigned long value)
286 {
287 return _hypercall2(int, set_debugreg, reg, value);
288 }
289
290 static inline unsigned long
291 HYPERVISOR_get_debugreg(int reg)
292 {
293 return _hypercall1(unsigned long, get_debugreg, reg);
294 }
295
296 static inline int
297 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
298 {
299 if (sizeof(u64) == sizeof(long))
300 return _hypercall2(int, update_descriptor, ma, desc);
301 return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
302 }
303
304 static inline int
305 HYPERVISOR_memory_op(unsigned int cmd, void *arg)
306 {
307 return _hypercall2(int, memory_op, cmd, arg);
308 }
309
310 static inline int
311 HYPERVISOR_multicall(void *call_list, int nr_calls)
312 {
313 return _hypercall2(int, multicall, call_list, nr_calls);
314 }
315
316 static inline int
317 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
318 unsigned long flags)
319 {
320 if (sizeof(new_val) == sizeof(long))
321 return _hypercall3(int, update_va_mapping, va,
322 new_val.pte, flags);
323 else
324 return _hypercall4(int, update_va_mapping, va,
325 new_val.pte, new_val.pte >> 32, flags);
326 }
327
328 static inline int
329 HYPERVISOR_event_channel_op(int cmd, void *arg)
330 {
331 int rc = _hypercall2(int, event_channel_op, cmd, arg);
332 if (unlikely(rc == -ENOSYS)) {
333 struct evtchn_op op;
334 op.cmd = cmd;
335 memcpy(&op.u, arg, sizeof(op.u));
336 rc = _hypercall1(int, event_channel_op_compat, &op);
337 memcpy(arg, &op.u, sizeof(op.u));
338 }
339 return rc;
340 }
341
342 static inline int
343 HYPERVISOR_xen_version(int cmd, void *arg)
344 {
345 return _hypercall2(int, xen_version, cmd, arg);
346 }
347
348 static inline int
349 HYPERVISOR_console_io(int cmd, int count, char *str)
350 {
351 return _hypercall3(int, console_io, cmd, count, str);
352 }
353
354 static inline int
355 HYPERVISOR_physdev_op(int cmd, void *arg)
356 {
357 int rc = _hypercall2(int, physdev_op, cmd, arg);
358 if (unlikely(rc == -ENOSYS)) {
359 struct physdev_op op;
360 op.cmd = cmd;
361 memcpy(&op.u, arg, sizeof(op.u));
362 rc = _hypercall1(int, physdev_op_compat, &op);
363 memcpy(arg, &op.u, sizeof(op.u));
364 }
365 return rc;
366 }
367
368 static inline int
369 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
370 {
371 return _hypercall3(int, grant_table_op, cmd, uop, count);
372 }
373
374 static inline int
375 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
376 unsigned long flags, domid_t domid)
377 {
378 if (sizeof(new_val) == sizeof(long))
379 return _hypercall4(int, update_va_mapping_otherdomain, va,
380 new_val.pte, flags, domid);
381 else
382 return _hypercall5(int, update_va_mapping_otherdomain, va,
383 new_val.pte, new_val.pte >> 32,
384 flags, domid);
385 }
386
387 static inline int
388 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
389 {
390 return _hypercall2(int, vm_assist, cmd, type);
391 }
392
393 static inline int
394 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
395 {
396 return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
397 }
398
399 #ifdef CONFIG_X86_64
400 static inline int
401 HYPERVISOR_set_segment_base(int reg, unsigned long value)
402 {
403 return _hypercall2(int, set_segment_base, reg, value);
404 }
405 #endif
406
407 static inline int
408 HYPERVISOR_suspend(unsigned long srec)
409 {
410 return _hypercall3(int, sched_op, SCHEDOP_shutdown,
411 SHUTDOWN_suspend, srec);
412 }
413
414 static inline int
415 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
416 {
417 return _hypercall2(int, nmi_op, op, arg);
418 }
419
420 static inline void
421 MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
422 {
423 mcl->op = __HYPERVISOR_fpu_taskswitch;
424 mcl->args[0] = set;
425 }
426
427 static inline void
428 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
429 pte_t new_val, unsigned long flags)
430 {
431 mcl->op = __HYPERVISOR_update_va_mapping;
432 mcl->args[0] = va;
433 if (sizeof(new_val) == sizeof(long)) {
434 mcl->args[1] = new_val.pte;
435 mcl->args[2] = flags;
436 } else {
437 mcl->args[1] = new_val.pte;
438 mcl->args[2] = new_val.pte >> 32;
439 mcl->args[3] = flags;
440 }
441 }
442
443 static inline void
444 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
445 void *uop, unsigned int count)
446 {
447 mcl->op = __HYPERVISOR_grant_table_op;
448 mcl->args[0] = cmd;
449 mcl->args[1] = (unsigned long)uop;
450 mcl->args[2] = count;
451 }
452
453 static inline void
454 MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
455 pte_t new_val, unsigned long flags,
456 domid_t domid)
457 {
458 mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
459 mcl->args[0] = va;
460 if (sizeof(new_val) == sizeof(long)) {
461 mcl->args[1] = new_val.pte;
462 mcl->args[2] = flags;
463 mcl->args[3] = domid;
464 } else {
465 mcl->args[1] = new_val.pte;
466 mcl->args[2] = new_val.pte >> 32;
467 mcl->args[3] = flags;
468 mcl->args[4] = domid;
469 }
470 }
471
472 static inline void
473 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
474 struct desc_struct desc)
475 {
476 mcl->op = __HYPERVISOR_update_descriptor;
477 if (sizeof(maddr) == sizeof(long)) {
478 mcl->args[0] = maddr;
479 mcl->args[1] = *(unsigned long *)&desc;
480 } else {
481 mcl->args[0] = maddr;
482 mcl->args[1] = maddr >> 32;
483 mcl->args[2] = desc.a;
484 mcl->args[3] = desc.b;
485 }
486 }
487
488 static inline void
489 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
490 {
491 mcl->op = __HYPERVISOR_memory_op;
492 mcl->args[0] = cmd;
493 mcl->args[1] = (unsigned long)arg;
494 }
495
496 static inline void
497 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
498 int count, int *success_count, domid_t domid)
499 {
500 mcl->op = __HYPERVISOR_mmu_update;
501 mcl->args[0] = (unsigned long)req;
502 mcl->args[1] = count;
503 mcl->args[2] = (unsigned long)success_count;
504 mcl->args[3] = domid;
505 }
506
507 static inline void
508 MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
509 int *success_count, domid_t domid)
510 {
511 mcl->op = __HYPERVISOR_mmuext_op;
512 mcl->args[0] = (unsigned long)op;
513 mcl->args[1] = count;
514 mcl->args[2] = (unsigned long)success_count;
515 mcl->args[3] = domid;
516 }
517
518 static inline void
519 MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
520 {
521 mcl->op = __HYPERVISOR_set_gdt;
522 mcl->args[0] = (unsigned long)frames;
523 mcl->args[1] = entries;
524 }
525
526 static inline void
527 MULTI_stack_switch(struct multicall_entry *mcl,
528 unsigned long ss, unsigned long esp)
529 {
530 mcl->op = __HYPERVISOR_stack_switch;
531 mcl->args[0] = ss;
532 mcl->args[1] = esp;
533 }
534
535 #endif /* _ASM_X86_XEN_HYPERCALL_H */
Linux with added FPC-III support