release/src-rt-6.x.4708/linux/linux-2.6.36/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
  49
  50 extern struct { char _entry[32]; } hypercall_page[];
  51
  52 #define __HYPERCALL             "call hypercall_page+%c[offset]"
  53 #define __HYPERCALL_ENTRY(x)                                            \
  54         [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
  55
  56 #ifdef CONFIG_X86_32
  57 #define __HYPERCALL_RETREG      "eax"
  58 #define __HYPERCALL_ARG1REG     "ebx"
  59 #define __HYPERCALL_ARG2REG     "ecx"
  60 #define __HYPERCALL_ARG3REG     "edx"
  61 #define __HYPERCALL_ARG4REG     "esi"
  62 #define __HYPERCALL_ARG5REG     "edi"
  63 #else
  64 #define __HYPERCALL_RETREG      "rax"
  65 #define __HYPERCALL_ARG1REG     "rdi"
  66 #define __HYPERCALL_ARG2REG     "rsi"
  67 #define __HYPERCALL_ARG3REG     "rdx"
  68 #define __HYPERCALL_ARG4REG     "r10"
  69 #define __HYPERCALL_ARG5REG     "r8"
  70 #endif
  71
  72 #define __HYPERCALL_DECLS                                               \
  73         register unsigned long __res  asm(__HYPERCALL_RETREG);          \
  74         register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
  75         register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
  76         register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
  77         register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
  78         register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;
  79
  80 #define __HYPERCALL_0PARAM      "=r" (__res)
  81 #define __HYPERCALL_1PARAM      __HYPERCALL_0PARAM, "+r" (__arg1)
  82 #define __HYPERCALL_2PARAM      __HYPERCALL_1PARAM, "+r" (__arg2)
  83 #define __HYPERCALL_3PARAM      __HYPERCALL_2PARAM, "+r" (__arg3)
  84 #define __HYPERCALL_4PARAM      __HYPERCALL_3PARAM, "+r" (__arg4)
  85 #define __HYPERCALL_5PARAM      __HYPERCALL_4PARAM, "+r" (__arg5)
  86
  87 #define __HYPERCALL_0ARG()
  88 #define __HYPERCALL_1ARG(a1)                                            \
  89         __HYPERCALL_0ARG()              __arg1 = (unsigned long)(a1);
  90 #define __HYPERCALL_2ARG(a1,a2)                                         \
  91         __HYPERCALL_1ARG(a1)            __arg2 = (unsigned long)(a2);
  92 #define __HYPERCALL_3ARG(a1,a2,a3)                                      \
  93         __HYPERCALL_2ARG(a1,a2)         __arg3 = (unsigned long)(a3);
  94 #define __HYPERCALL_4ARG(a1,a2,a3,a4)                                   \
  95         __HYPERCALL_3ARG(a1,a2,a3)      __arg4 = (unsigned long)(a4);
  96 #define __HYPERCALL_5ARG(a1,a2,a3,a4,a5)                                \
  97         __HYPERCALL_4ARG(a1,a2,a3,a4)   __arg5 = (unsigned long)(a5);
  98
  99 #define __HYPERCALL_CLOBBER5    "memory"
 100 #define __HYPERCALL_CLOBBER4    __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
 101 #define __HYPERCALL_CLOBBER3    __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
 102 #define __HYPERCALL_CLOBBER2    __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
 103 #define __HYPERCALL_CLOBBER1    __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
 104 #define __HYPERCALL_CLOBBER0    __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
 105
 106 #define _hypercall0(type, name)                                         \
 107 ({                                                                      \
 108         __HYPERCALL_DECLS;                                              \
 109         __HYPERCALL_0ARG();                                             \
 110         asm volatile (__HYPERCALL                                       \
 111                       : __HYPERCALL_0PARAM                              \
 112                       : __HYPERCALL_ENTRY(name)                         \
 113                       : __HYPERCALL_CLOBBER0);                          \
 114         (type)__res;                                                    \
 115 })
 116
 117 #define _hypercall1(type, name, a1)                                     \
 118 ({                                                                      \
 119         __HYPERCALL_DECLS;                                              \
 120         __HYPERCALL_1ARG(a1);                                           \
 121         asm volatile (__HYPERCALL                                       \
 122                       : __HYPERCALL_1PARAM                              \
 123                       : __HYPERCALL_ENTRY(name)                         \
 124                       : __HYPERCALL_CLOBBER1);                          \
 125         (type)__res;                                                    \
 126 })
 127
 128 #define _hypercall2(type, name, a1, a2)                                 \
 129 ({                                                                      \
 130         __HYPERCALL_DECLS;                                              \
 131         __HYPERCALL_2ARG(a1, a2);                                       \
 132         asm volatile (__HYPERCALL                                       \
 133                       : __HYPERCALL_2PARAM                              \
 134                       : __HYPERCALL_ENTRY(name)                         \
 135                       : __HYPERCALL_CLOBBER2);                          \
 136         (type)__res;                                                    \
 137 })
 138
 139 #define _hypercall3(type, name, a1, a2, a3)                             \
 140 ({                                                                      \
 141         __HYPERCALL_DECLS;                                              \
 142         __HYPERCALL_3ARG(a1, a2, a3);                                   \
 143         asm volatile (__HYPERCALL                                       \
 144                       : __HYPERCALL_3PARAM                              \
 145                       : __HYPERCALL_ENTRY(name)                         \
 146                       : __HYPERCALL_CLOBBER3);                          \
 147         (type)__res;                                                    \
 148 })
 149
 150 #define _hypercall4(type, name, a1, a2, a3, a4)                         \
 151 ({                                                                      \
 152         __HYPERCALL_DECLS;                                              \
 153         __HYPERCALL_4ARG(a1, a2, a3, a4);                               \
 154         asm volatile (__HYPERCALL                                       \
 155                       : __HYPERCALL_4PARAM                              \
 156                       : __HYPERCALL_ENTRY(name)                         \
 157                       : __HYPERCALL_CLOBBER4);                          \
 158         (type)__res;                                                    \
 159 })
 160
 161 #define _hypercall5(type, name, a1, a2, a3, a4, a5)                     \
 162 ({                                                                      \
 163         __HYPERCALL_DECLS;                                              \
 164         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);                           \
 165         asm volatile (__HYPERCALL                                       \
 166                       : __HYPERCALL_5PARAM                              \
 167                       : __HYPERCALL_ENTRY(name)                         \
 168                       : __HYPERCALL_CLOBBER5);                          \
 169         (type)__res;                                                    \
 170 })
 171
 172 static inline int
 173 HYPERVISOR_set_trap_table(struct trap_info *table)
 174 {
 175         return _hypercall1(int, set_trap_table, table);
 176 }
 177
 178 static inline int
 179 HYPERVISOR_mmu_update(struct mmu_update *req, int count,
 180                       int *success_count, domid_t domid)
 181 {
 182         return _hypercall4(int, mmu_update, req, count, success_count, domid);
 183 }
 184
 185 static inline int
 186 HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
 187                      int *success_count, domid_t domid)
 188 {
 189         return _hypercall4(int, mmuext_op, op, count, success_count, domid);
 190 }
 191
 192 static inline int
 193 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
 194 {
 195         return _hypercall2(int, set_gdt, frame_list, entries);
 196 }
 197
 198 static inline int
 199 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
 200 {
 201         return _hypercall2(int, stack_switch, ss, esp);
 202 }
 203
 204 #ifdef CONFIG_X86_32
 205 static inline int
 206 HYPERVISOR_set_callbacks(unsigned long event_selector,
 207                          unsigned long event_address,
 208                          unsigned long failsafe_selector,
 209                          unsigned long failsafe_address)
 210 {
 211         return _hypercall4(int, set_callbacks,
 212                            event_selector, event_address,
 213                            failsafe_selector, failsafe_address);
 214 }
 215 #else  /* CONFIG_X86_64 */
 216 static inline int
 217 HYPERVISOR_set_callbacks(unsigned long event_address,
 218                         unsigned long failsafe_address,
 219                         unsigned long syscall_address)
 220 {
 221         return _hypercall3(int, set_callbacks,
 222                            event_address, failsafe_address,
 223                            syscall_address);
 224 }
 225 #endif  /* CONFIG_X86_{32,64} */
 226
 227 static inline int
 228 HYPERVISOR_callback_op(int cmd, void *arg)
 229 {
 230         return _hypercall2(int, callback_op, cmd, arg);
 231 }
 232
 233 static inline int
 234 HYPERVISOR_fpu_taskswitch(int set)
 235 {
 236         return _hypercall1(int, fpu_taskswitch, set);
 237 }
 238
 239 static inline int
 240 HYPERVISOR_sched_op(int cmd, void *arg)
 241 {
 242         return _hypercall2(int, sched_op_new, cmd, arg);
 243 }
 244
 245 static inline long
 246 HYPERVISOR_set_timer_op(u64 timeout)
 247 {
 248         unsigned long timeout_hi = (unsigned long)(timeout>>32);
 249         unsigned long timeout_lo = (unsigned long)timeout;
 250         return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
 251 }
 252
 253 static inline int
 254 HYPERVISOR_set_debugreg(int reg, unsigned long value)
 255 {
 256         return _hypercall2(int, set_debugreg, reg, value);
 257 }
 258
 259 static inline unsigned long
 260 HYPERVISOR_get_debugreg(int reg)
 261 {
 262         return _hypercall1(unsigned long, get_debugreg, reg);
 263 }
 264
 265 static inline int
 266 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
 267 {
 268         if (sizeof(u64) == sizeof(long))
 269                 return _hypercall2(int, update_descriptor, ma, desc);
 270         return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
 271 }
 272
 273 static inline int
 274 HYPERVISOR_memory_op(unsigned int cmd, void *arg)
 275 {
 276         return _hypercall2(int, memory_op, cmd, arg);
 277 }
 278
 279 static inline int
 280 HYPERVISOR_multicall(void *call_list, int nr_calls)
 281 {
 282         return _hypercall2(int, multicall, call_list, nr_calls);
 283 }
 284
 285 static inline int
 286 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
 287                              unsigned long flags)
 288 {
 289         if (sizeof(new_val) == sizeof(long))
 290                 return _hypercall3(int, update_va_mapping, va,
 291                                    new_val.pte, flags);
 292         else
 293                 return _hypercall4(int, update_va_mapping, va,
 294                                    new_val.pte, new_val.pte >> 32, flags);
 295 }
 296
 297 static inline int
 298 HYPERVISOR_event_channel_op(int cmd, void *arg)
 299 {
 300         int rc = _hypercall2(int, event_channel_op, cmd, arg);
 301         if (unlikely(rc == -ENOSYS)) {
 302                 struct evtchn_op op;
 303                 op.cmd = cmd;
 304                 memcpy(&op.u, arg, sizeof(op.u));
 305                 rc = _hypercall1(int, event_channel_op_compat, &op);
 306                 memcpy(arg, &op.u, sizeof(op.u));
 307         }
 308         return rc;
 309 }
 310
 311 static inline int
 312 HYPERVISOR_xen_version(int cmd, void *arg)
 313 {
 314         return _hypercall2(int, xen_version, cmd, arg);
 315 }
 316
 317 static inline int
 318 HYPERVISOR_console_io(int cmd, int count, char *str)
 319 {
 320         return _hypercall3(int, console_io, cmd, count, str);
 321 }
 322
 323 static inline int
 324 HYPERVISOR_physdev_op(int cmd, void *arg)
 325 {
 326         int rc = _hypercall2(int, physdev_op, cmd, arg);
 327         if (unlikely(rc == -ENOSYS)) {
 328                 struct physdev_op op;
 329                 op.cmd = cmd;
 330                 memcpy(&op.u, arg, sizeof(op.u));
 331                 rc = _hypercall1(int, physdev_op_compat, &op);
 332                 memcpy(arg, &op.u, sizeof(op.u));
 333         }
 334         return rc;
 335 }
 336
 337 static inline int
 338 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
 339 {
 340         return _hypercall3(int, grant_table_op, cmd, uop, count);
 341 }
 342
 343 static inline int
 344 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
 345                                          unsigned long flags, domid_t domid)
 346 {
 347         if (sizeof(new_val) == sizeof(long))
 348                 return _hypercall4(int, update_va_mapping_otherdomain, va,
 349                                    new_val.pte, flags, domid);
 350         else
 351                 return _hypercall5(int, update_va_mapping_otherdomain, va,
 352                                    new_val.pte, new_val.pte >> 32,
 353                                    flags, domid);
 354 }
 355
 356 static inline int
 357 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
 358 {
 359         return _hypercall2(int, vm_assist, cmd, type);
 360 }
 361
 362 static inline int
 363 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
 364 {
 365         return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
 366 }
 367
 368 #ifdef CONFIG_X86_64
 369 static inline int
 370 HYPERVISOR_set_segment_base(int reg, unsigned long value)
 371 {
 372         return _hypercall2(int, set_segment_base, reg, value);
 373 }
 374 #endif
 375
 376 static inline int
 377 HYPERVISOR_suspend(unsigned long srec)
 378 {
 379         return _hypercall3(int, sched_op, SCHEDOP_shutdown,
 380                            SHUTDOWN_suspend, srec);
 381 }
 382
 383 static inline int
 384 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
 385 {
 386         return _hypercall2(int, nmi_op, op, arg);
 387 }
 388
 389 static inline unsigned long __must_check
 390 HYPERVISOR_hvm_op(int op, void *arg)
 391 {
 392        return _hypercall2(unsigned long, hvm_op, op, arg);
 393 }
 394
 395 static inline void
 396 MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
 397 {
 398         mcl->op = __HYPERVISOR_fpu_taskswitch;
 399         mcl->args[0] = set;
 400 }
 401
 402 static inline void
 403 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
 404                         pte_t new_val, unsigned long flags)
 405 {
 406         mcl->op = __HYPERVISOR_update_va_mapping;
 407         mcl->args[0] = va;
 408         if (sizeof(new_val) == sizeof(long)) {
 409                 mcl->args[1] = new_val.pte;
 410                 mcl->args[2] = flags;
 411         } else {
 412                 mcl->args[1] = new_val.pte;
 413                 mcl->args[2] = new_val.pte >> 32;
 414                 mcl->args[3] = flags;
 415         }
 416 }
 417
 418 static inline void
 419 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
 420                      void *uop, unsigned int count)
 421 {
 422         mcl->op = __HYPERVISOR_grant_table_op;
 423         mcl->args[0] = cmd;
 424         mcl->args[1] = (unsigned long)uop;
 425         mcl->args[2] = count;
 426 }
 427
 428 static inline void
 429 MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
 430                                     pte_t new_val, unsigned long flags,
 431                                     domid_t domid)
 432 {
 433         mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
 434         mcl->args[0] = va;
 435         if (sizeof(new_val) == sizeof(long)) {
 436                 mcl->args[1] = new_val.pte;
 437                 mcl->args[2] = flags;
 438                 mcl->args[3] = domid;
 439         } else {
 440                 mcl->args[1] = new_val.pte;
 441                 mcl->args[2] = new_val.pte >> 32;
 442                 mcl->args[3] = flags;
 443                 mcl->args[4] = domid;
 444         }
 445 }
 446
 447 static inline void
 448 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
 449                         struct desc_struct desc)
 450 {
 451         mcl->op = __HYPERVISOR_update_descriptor;
 452         if (sizeof(maddr) == sizeof(long)) {
 453                 mcl->args[0] = maddr;
 454                 mcl->args[1] = *(unsigned long *)&desc;
 455         } else {
 456                 mcl->args[0] = maddr;
 457                 mcl->args[1] = maddr >> 32;
 458                 mcl->args[2] = desc.a;
 459                 mcl->args[3] = desc.b;
 460         }
 461 }
 462
 463 static inline void
 464 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
 465 {
 466         mcl->op = __HYPERVISOR_memory_op;
 467         mcl->args[0] = cmd;
 468         mcl->args[1] = (unsigned long)arg;
 469 }
 470
 471 static inline void
 472 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
 473                  int count, int *success_count, domid_t domid)
 474 {
 475         mcl->op = __HYPERVISOR_mmu_update;
 476         mcl->args[0] = (unsigned long)req;
 477         mcl->args[1] = count;
 478         mcl->args[2] = (unsigned long)success_count;
 479         mcl->args[3] = domid;
 480 }
 481
 482 static inline void
 483 MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
 484                 int *success_count, domid_t domid)
 485 {
 486         mcl->op = __HYPERVISOR_mmuext_op;
 487         mcl->args[0] = (unsigned long)op;
 488         mcl->args[1] = count;
 489         mcl->args[2] = (unsigned long)success_count;
 490         mcl->args[3] = domid;
 491 }
 492
 493 static inline void
 494 MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
 495 {
 496         mcl->op = __HYPERVISOR_set_gdt;
 497         mcl->args[0] = (unsigned long)frames;
 498         mcl->args[1] = entries;
 499 }
 500
 501 static inline void
 502 MULTI_stack_switch(struct multicall_entry *mcl,
 503                    unsigned long ss, unsigned long esp)
 504 {
 505         mcl->op = __HYPERVISOR_stack_switch;
 506         mcl->args[0] = ss;
 507         mcl->args[1] = esp;
 508 }
 509
 510 #endif /* _ASM_X86_XEN_HYPERCALL_H */