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diff --git a/include/asm-x86/xen/hypercall.h b/include/asm-x86/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/errno.h>
37#include <linux/string.h>
38
39#include <xen/interface/xen.h>
40#include <xen/interface/sched.h>
41#include <xen/interface/physdev.h>
42
43/*
44 * The hypercall asms have to meet several constraints:
45 * - Work on 32- and 64-bit.
46 * The two architectures put their arguments in different sets of
47 * registers.
48 *
49 * - Work around asm syntax quirks
50 * It isn't possible to specify one of the rNN registers in a
51 * constraint, so we use explicit register variables to get the
52 * args into the right place.
53 *
54 * - Mark all registers as potentially clobbered
55 * Even unused parameters can be clobbered by the hypervisor, so we
56 * need to make sure gcc knows it.
57 *
58 * - Avoid compiler bugs.
59 * This is the tricky part. Because x86_32 has such a constrained
60 * register set, gcc versions below 4.3 have trouble generating
61 * code when all the arg registers and memory are trashed by the
62 * asm. There are syntactically simpler ways of achieving the
63 * semantics below, but they cause the compiler to crash.
64 *
65 * The only combination I found which works is:
66 * - assign the __argX variables first
67 * - list all actually used parameters as "+r" (__argX)
68 * - clobber the rest
69 *
70 * The result certainly isn't pretty, and it really shows up cpp's
71 * weakness as as macro language. Sorry. (But let's just give thanks
72 * there aren't more than 5 arguments...)
73 */
74
75extern struct { char _entry[32]; } hypercall_page[];
76
77#define __HYPERCALL "call hypercall_page+%c[offset]"
78#define __HYPERCALL_ENTRY(x) \
79 [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
80
81#ifdef CONFIG_X86_32
82#define __HYPERCALL_RETREG "eax"
83#define __HYPERCALL_ARG1REG "ebx"
84#define __HYPERCALL_ARG2REG "ecx"
85#define __HYPERCALL_ARG3REG "edx"
86#define __HYPERCALL_ARG4REG "esi"
87#define __HYPERCALL_ARG5REG "edi"
88#else
89#define __HYPERCALL_RETREG "rax"
90#define __HYPERCALL_ARG1REG "rdi"
91#define __HYPERCALL_ARG2REG "rsi"
92#define __HYPERCALL_ARG3REG "rdx"
93#define __HYPERCALL_ARG4REG "r10"
94#define __HYPERCALL_ARG5REG "r8"
95#endif
96
97#define __HYPERCALL_DECLS \
98 register unsigned long __res asm(__HYPERCALL_RETREG); \
99 register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
100 register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
101 register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
102 register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
103 register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;
104
105#define __HYPERCALL_0PARAM "=r" (__res)
106#define __HYPERCALL_1PARAM __HYPERCALL_0PARAM, "+r" (__arg1)
107#define __HYPERCALL_2PARAM __HYPERCALL_1PARAM, "+r" (__arg2)
108#define __HYPERCALL_3PARAM __HYPERCALL_2PARAM, "+r" (__arg3)
109#define __HYPERCALL_4PARAM __HYPERCALL_3PARAM, "+r" (__arg4)
110#define __HYPERCALL_5PARAM __HYPERCALL_4PARAM, "+r" (__arg5)
111
112#define __HYPERCALL_0ARG()
113#define __HYPERCALL_1ARG(a1) \
114 __HYPERCALL_0ARG() __arg1 = (unsigned long)(a1);
115#define __HYPERCALL_2ARG(a1,a2) \
116 __HYPERCALL_1ARG(a1) __arg2 = (unsigned long)(a2);
117#define __HYPERCALL_3ARG(a1,a2,a3) \
118 __HYPERCALL_2ARG(a1,a2) __arg3 = (unsigned long)(a3);
119#define __HYPERCALL_4ARG(a1,a2,a3,a4) \
120 __HYPERCALL_3ARG(a1,a2,a3) __arg4 = (unsigned long)(a4);
121#define __HYPERCALL_5ARG(a1,a2,a3,a4,a5) \
122 __HYPERCALL_4ARG(a1,a2,a3,a4) __arg5 = (unsigned long)(a5);
123
124#define __HYPERCALL_CLOBBER5 "memory"
125#define __HYPERCALL_CLOBBER4 __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
126#define __HYPERCALL_CLOBBER3 __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
127#define __HYPERCALL_CLOBBER2 __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
128#define __HYPERCALL_CLOBBER1 __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
129#define __HYPERCALL_CLOBBER0 __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
130
131#define _hypercall0(type, name) \
132({ \
133 __HYPERCALL_DECLS; \
134 __HYPERCALL_0ARG(); \
135 asm volatile (__HYPERCALL \
136 : __HYPERCALL_0PARAM \
137 : __HYPERCALL_ENTRY(name) \
138 : __HYPERCALL_CLOBBER0); \
139 (type)__res; \
140})
141
142#define _hypercall1(type, name, a1) \
143({ \
144 __HYPERCALL_DECLS; \
145 __HYPERCALL_1ARG(a1); \
146 asm volatile (__HYPERCALL \
147 : __HYPERCALL_1PARAM \
148 : __HYPERCALL_ENTRY(name) \
149 : __HYPERCALL_CLOBBER1); \
150 (type)__res; \
151})
152
153#define _hypercall2(type, name, a1, a2) \
154({ \
155 __HYPERCALL_DECLS; \
156 __HYPERCALL_2ARG(a1, a2); \
157 asm volatile (__HYPERCALL \
158 : __HYPERCALL_2PARAM \
159 : __HYPERCALL_ENTRY(name) \
160 : __HYPERCALL_CLOBBER2); \
161 (type)__res; \
162})
163
164#define _hypercall3(type, name, a1, a2, a3) \
165({ \
166 __HYPERCALL_DECLS; \
167 __HYPERCALL_3ARG(a1, a2, a3); \
168 asm volatile (__HYPERCALL \
169 : __HYPERCALL_3PARAM \
170 : __HYPERCALL_ENTRY(name) \
171 : __HYPERCALL_CLOBBER3); \
172 (type)__res; \
173})
174
175#define _hypercall4(type, name, a1, a2, a3, a4) \
176({ \
177 __HYPERCALL_DECLS; \
178 __HYPERCALL_4ARG(a1, a2, a3, a4); \
179 asm volatile (__HYPERCALL \
180 : __HYPERCALL_4PARAM \
181 : __HYPERCALL_ENTRY(name) \
182 : __HYPERCALL_CLOBBER4); \
183 (type)__res; \
184})
185
186#define _hypercall5(type, name, a1, a2, a3, a4, a5) \
187({ \
188 __HYPERCALL_DECLS; \
189 __HYPERCALL_5ARG(a1, a2, a3, a4, a5); \
190 asm volatile (__HYPERCALL \
191 : __HYPERCALL_5PARAM \
192 : __HYPERCALL_ENTRY(name) \
193 : __HYPERCALL_CLOBBER5); \
194 (type)__res; \
195})
196
197static inline int
198HYPERVISOR_set_trap_table(struct trap_info *table)
199{
200 return _hypercall1(int, set_trap_table, table);
201}
202
203static inline int
204HYPERVISOR_mmu_update(struct mmu_update *req, int count,
205 int *success_count, domid_t domid)
206{
207 return _hypercall4(int, mmu_update, req, count, success_count, domid);
208}
209
210static inline int
211HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
212 int *success_count, domid_t domid)
213{
214 return _hypercall4(int, mmuext_op, op, count, success_count, domid);
215}
216
217static inline int
218HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
219{
220 return _hypercall2(int, set_gdt, frame_list, entries);
221}
222
223static inline int
224HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
225{
226 return _hypercall2(int, stack_switch, ss, esp);
227}
228
229#ifdef CONFIG_X86_32
230static inline int
231HYPERVISOR_set_callbacks(unsigned long event_selector,
232 unsigned long event_address,
233 unsigned long failsafe_selector,
234 unsigned long failsafe_address)
235{
236 return _hypercall4(int, set_callbacks,
237 event_selector, event_address,
238 failsafe_selector, failsafe_address);
239}
240#else /* CONFIG_X86_64 */
241static inline int
242HYPERVISOR_set_callbacks(unsigned long event_address,
243 unsigned long failsafe_address,
244 unsigned long syscall_address)
245{
246 return _hypercall3(int, set_callbacks,
247 event_address, failsafe_address,
248 syscall_address);
249}
250#endif /* CONFIG_X86_{32,64} */
251
252static inline int
253HYPERVISOR_callback_op(int cmd, void *arg)
254{
255 return _hypercall2(int, callback_op, cmd, arg);
256}
257
258static inline int
259HYPERVISOR_fpu_taskswitch(int set)
260{
261 return _hypercall1(int, fpu_taskswitch, set);
262}
263
264static inline int
265HYPERVISOR_sched_op(int cmd, void *arg)
266{
267 return _hypercall2(int, sched_op_new, cmd, arg);
268}
269
270static inline long
271HYPERVISOR_set_timer_op(u64 timeout)
272{
273 unsigned long timeout_hi = (unsigned long)(timeout>>32);
274 unsigned long timeout_lo = (unsigned long)timeout;
275 return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
276}
277
278static inline int
279HYPERVISOR_set_debugreg(int reg, unsigned long value)
280{
281 return _hypercall2(int, set_debugreg, reg, value);
282}
283
284static inline unsigned long
285HYPERVISOR_get_debugreg(int reg)
286{
287 return _hypercall1(unsigned long, get_debugreg, reg);
288}
289
290static inline int
291HYPERVISOR_update_descriptor(u64 ma, u64 desc)
292{
293 return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
294}
295
296static inline int
297HYPERVISOR_memory_op(unsigned int cmd, void *arg)
298{
299 return _hypercall2(int, memory_op, cmd, arg);
300}
301
302static inline int
303HYPERVISOR_multicall(void *call_list, int nr_calls)
304{
305 return _hypercall2(int, multicall, call_list, nr_calls);
306}
307
308static inline int
309HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
310 unsigned long flags)
311{
312 if (sizeof(new_val) == sizeof(long))
313 return _hypercall3(int, update_va_mapping, va,
314 new_val.pte, flags);
315 else
316 return _hypercall4(int, update_va_mapping, va,
317 new_val.pte, new_val.pte >> 32, flags);
318}
319
320static inline int
321HYPERVISOR_event_channel_op(int cmd, void *arg)
322{
323 int rc = _hypercall2(int, event_channel_op, cmd, arg);
324 if (unlikely(rc == -ENOSYS)) {
325 struct evtchn_op op;
326 op.cmd = cmd;
327 memcpy(&op.u, arg, sizeof(op.u));
328 rc = _hypercall1(int, event_channel_op_compat, &op);
329 memcpy(arg, &op.u, sizeof(op.u));
330 }
331 return rc;
332}
333
334static inline int
335HYPERVISOR_xen_version(int cmd, void *arg)
336{
337 return _hypercall2(int, xen_version, cmd, arg);
338}
339
340static inline int
341HYPERVISOR_console_io(int cmd, int count, char *str)
342{
343 return _hypercall3(int, console_io, cmd, count, str);
344}
345
346static inline int
347HYPERVISOR_physdev_op(int cmd, void *arg)
348{
349 int rc = _hypercall2(int, physdev_op, cmd, arg);
350 if (unlikely(rc == -ENOSYS)) {
351 struct physdev_op op;
352 op.cmd = cmd;
353 memcpy(&op.u, arg, sizeof(op.u));
354 rc = _hypercall1(int, physdev_op_compat, &op);
355 memcpy(arg, &op.u, sizeof(op.u));
356 }
357 return rc;
358}
359
360static inline int
361HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
362{
363 return _hypercall3(int, grant_table_op, cmd, uop, count);
364}
365
366static inline int
367HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
368 unsigned long flags, domid_t domid)
369{
370 if (sizeof(new_val) == sizeof(long))
371 return _hypercall4(int, update_va_mapping_otherdomain, va,
372 new_val.pte, flags, domid);
373 else
374 return _hypercall5(int, update_va_mapping_otherdomain, va,
375 new_val.pte, new_val.pte >> 32,
376 flags, domid);
377}
378
379static inline int
380HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
381{
382 return _hypercall2(int, vm_assist, cmd, type);
383}
384
385static inline int
386HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
387{
388 return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
389}
390
391#ifdef CONFIG_X86_64
392static inline int
393HYPERVISOR_set_segment_base(int reg, unsigned long value)
394{
395 return _hypercall2(int, set_segment_base, reg, value);
396}
397#endif
398
399static inline int
400HYPERVISOR_suspend(unsigned long srec)
401{
402 return _hypercall3(int, sched_op, SCHEDOP_shutdown,
403 SHUTDOWN_suspend, srec);
404}
405
406static inline int
407HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
408{
409 return _hypercall2(int, nmi_op, op, arg);
410}
411
412static inline void
413MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
414{
415 mcl->op = __HYPERVISOR_fpu_taskswitch;
416 mcl->args[0] = set;
417}
418
419static inline void
420MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
421 pte_t new_val, unsigned long flags)
422{
423 mcl->op = __HYPERVISOR_update_va_mapping;
424 mcl->args[0] = va;
425 if (sizeof(new_val) == sizeof(long)) {
426 mcl->args[1] = new_val.pte;
427 mcl->args[2] = flags;
428 } else {
429 mcl->args[1] = new_val.pte;
430 mcl->args[2] = new_val.pte >> 32;
431 mcl->args[3] = flags;
432 }
433}
434
435static inline void
436MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
437 void *uop, unsigned int count)
438{
439 mcl->op = __HYPERVISOR_grant_table_op;
440 mcl->args[0] = cmd;
441 mcl->args[1] = (unsigned long)uop;
442 mcl->args[2] = count;
443}
444
445static inline void
446MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
447 pte_t new_val, unsigned long flags,
448 domid_t domid)
449{
450 mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
451 mcl->args[0] = va;
452 if (sizeof(new_val) == sizeof(long)) {
453 mcl->args[1] = new_val.pte;
454 mcl->args[2] = flags;
455 mcl->args[3] = domid;
456 } else {
457 mcl->args[1] = new_val.pte;
458 mcl->args[2] = new_val.pte >> 32;
459 mcl->args[3] = flags;
460 mcl->args[4] = domid;
461 }
462}
463
464static inline void
465MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
466 struct desc_struct desc)
467{
468 mcl->op = __HYPERVISOR_update_descriptor;
469 if (sizeof(maddr) == sizeof(long)) {
470 mcl->args[0] = maddr;
471 mcl->args[1] = *(unsigned long *)&desc;
472 } else {
473 mcl->args[0] = maddr;
474 mcl->args[1] = maddr >> 32;
475 mcl->args[2] = desc.a;
476 mcl->args[3] = desc.b;
477 }
478}
479
480static inline void
481MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
482{
483 mcl->op = __HYPERVISOR_memory_op;
484 mcl->args[0] = cmd;
485 mcl->args[1] = (unsigned long)arg;
486}
487
488static inline void
489MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
490 int count, int *success_count, domid_t domid)
491{
492 mcl->op = __HYPERVISOR_mmu_update;
493 mcl->args[0] = (unsigned long)req;
494 mcl->args[1] = count;
495 mcl->args[2] = (unsigned long)success_count;
496 mcl->args[3] = domid;
497}
498
499static inline void
500MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
501 int *success_count, domid_t domid)
502{
503 mcl->op = __HYPERVISOR_mmuext_op;
504 mcl->args[0] = (unsigned long)op;
505 mcl->args[1] = count;
506 mcl->args[2] = (unsigned long)success_count;
507 mcl->args[3] = domid;
508}
509
510static inline void
511MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
512{
513 mcl->op = __HYPERVISOR_set_gdt;
514 mcl->args[0] = (unsigned long)frames;
515 mcl->args[1] = entries;
516}
517
518static inline void
519MULTI_stack_switch(struct multicall_entry *mcl,
520 unsigned long ss, unsigned long esp)
521{
522 mcl->op = __HYPERVISOR_stack_switch;
523 mcl->args[0] = ss;
524 mcl->args[1] = esp;
525}
526
527#endif /* ASM_X86__XEN__HYPERCALL_H */
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