include/asm-x86/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 __HYPERCALL_H__
  34 #define __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 extern struct { char _entry[32]; } hypercall_page[];
  44
  45 #define _hypercall0(type, name)                                         \
  46 ({                                                                      \
  47         long __res;                                                     \
  48         asm volatile (                                                  \
  49                 "call %[call]"                                          \
  50                 : "=a" (__res)                                          \
  51                 : [call] "m" (hypercall_page[__HYPERVISOR_##name])      \
  52                 : "memory" );                                           \
  53         (type)__res;                                                    \
  54 })
  55
  56 #define _hypercall1(type, name, a1)                                     \
  57 ({                                                                      \
  58         long __res, __ign1;                                             \
  59         asm volatile (                                                  \
  60                 "call %[call]"                                          \
  61                 : "=a" (__res), "=b" (__ign1)                           \
  62                 : "1" ((long)(a1)),                                     \
  63                   [call] "m" (hypercall_page[__HYPERVISOR_##name])      \
  64                 : "memory" );                                           \
  65         (type)__res;                                                    \
  66 })
  67
  68 #define _hypercall2(type, name, a1, a2)                                 \
  69 ({                                                                      \
  70         long __res, __ign1, __ign2;                                     \
  71         asm volatile (                                                  \
  72                 "call %[call]"                                          \
  73                 : "=a" (__res), "=b" (__ign1), "=c" (__ign2)            \
  74                 : "1" ((long)(a1)), "2" ((long)(a2)),                   \
  75                   [call] "m" (hypercall_page[__HYPERVISOR_##name])      \
  76                 : "memory" );                                           \
  77         (type)__res;                                                    \
  78 })
  79
  80 #define _hypercall3(type, name, a1, a2, a3)                             \
  81 ({                                                                      \
  82         long __res, __ign1, __ign2, __ign3;                             \
  83         asm volatile (                                                  \
  84                 "call %[call]"                                          \
  85                 : "=a" (__res), "=b" (__ign1), "=c" (__ign2),           \
  86                 "=d" (__ign3)                                           \
  87                 : "1" ((long)(a1)), "2" ((long)(a2)),                   \
  88                   "3" ((long)(a3)),                                     \
  89                   [call] "m" (hypercall_page[__HYPERVISOR_##name])      \
  90                 : "memory" );                                           \
  91         (type)__res;                                                    \
  92 })
  93
  94 #define _hypercall4(type, name, a1, a2, a3, a4)                         \
  95 ({                                                                      \
  96         long __res, __ign1, __ign2, __ign3, __ign4;                     \
  97         asm volatile (                                                  \
  98                 "call %[call]"                                          \
  99                 : "=a" (__res), "=b" (__ign1), "=c" (__ign2),           \
 100                 "=d" (__ign3), "=S" (__ign4)                            \
 101                 : "1" ((long)(a1)), "2" ((long)(a2)),                   \
 102                   "3" ((long)(a3)), "4" ((long)(a4)),                   \
 103                   [call] "m" (hypercall_page[__HYPERVISOR_##name])      \
 104                 : "memory" );                                           \
 105         (type)__res;                                                    \
 106 })
 107
 108 #define _hypercall5(type, name, a1, a2, a3, a4, a5)                     \
 109 ({                                                                      \
 110         long __res, __ign1, __ign2, __ign3, __ign4, __ign5;             \
 111         asm volatile (                                                  \
 112                 "call %[call]"                                          \
 113                 : "=a" (__res), "=b" (__ign1), "=c" (__ign2),           \
 114                 "=d" (__ign3), "=S" (__ign4), "=D" (__ign5)             \
 115                 : "1" ((long)(a1)), "2" ((long)(a2)),                   \
 116                   "3" ((long)(a3)), "4" ((long)(a4)),                   \
 117                   "5" ((long)(a5)),                                     \
 118                   [call] "m" (hypercall_page[__HYPERVISOR_##name])      \
 119                 : "memory" );                                           \
 120         (type)__res;                                                    \
 121 })
 122
 123 static inline int
 124 HYPERVISOR_set_trap_table(struct trap_info *table)
 125 {
 126         return _hypercall1(int, set_trap_table, table);
 127 }
 128
 129 static inline int
 130 HYPERVISOR_mmu_update(struct mmu_update *req, int count,
 131                       int *success_count, domid_t domid)
 132 {
 133         return _hypercall4(int, mmu_update, req, count, success_count, domid);
 134 }
 135
 136 static inline int
 137 HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
 138                      int *success_count, domid_t domid)
 139 {
 140         return _hypercall4(int, mmuext_op, op, count, success_count, domid);
 141 }
 142
 143 static inline int
 144 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
 145 {
 146         return _hypercall2(int, set_gdt, frame_list, entries);
 147 }
 148
 149 static inline int
 150 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
 151 {
 152         return _hypercall2(int, stack_switch, ss, esp);
 153 }
 154
 155 static inline int
 156 HYPERVISOR_set_callbacks(unsigned long event_selector,
 157                          unsigned long event_address,
 158                          unsigned long failsafe_selector,
 159                          unsigned long failsafe_address)
 160 {
 161         return _hypercall4(int, set_callbacks,
 162                            event_selector, event_address,
 163                            failsafe_selector, failsafe_address);
 164 }
 165
 166 static inline int
 167 HYPERVISOR_callback_op(int cmd, void *arg)
 168 {
 169         return _hypercall2(int, callback_op, cmd, arg);
 170 }
 171
 172 static inline int
 173 HYPERVISOR_fpu_taskswitch(int set)
 174 {
 175         return _hypercall1(int, fpu_taskswitch, set);
 176 }
 177
 178 static inline int
 179 HYPERVISOR_sched_op(int cmd, unsigned long arg)
 180 {
 181         return _hypercall2(int, sched_op, cmd, arg);
 182 }
 183
 184 static inline long
 185 HYPERVISOR_set_timer_op(u64 timeout)
 186 {
 187         unsigned long timeout_hi = (unsigned long)(timeout>>32);
 188         unsigned long timeout_lo = (unsigned long)timeout;
 189         return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
 190 }
 191
 192 static inline int
 193 HYPERVISOR_set_debugreg(int reg, unsigned long value)
 194 {
 195         return _hypercall2(int, set_debugreg, reg, value);
 196 }
 197
 198 static inline unsigned long
 199 HYPERVISOR_get_debugreg(int reg)
 200 {
 201         return _hypercall1(unsigned long, get_debugreg, reg);
 202 }
 203
 204 static inline int
 205 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
 206 {
 207         return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
 208 }
 209
 210 static inline int
 211 HYPERVISOR_memory_op(unsigned int cmd, void *arg)
 212 {
 213         return _hypercall2(int, memory_op, cmd, arg);
 214 }
 215
 216 static inline int
 217 HYPERVISOR_multicall(void *call_list, int nr_calls)
 218 {
 219         return _hypercall2(int, multicall, call_list, nr_calls);
 220 }
 221
 222 static inline int
 223 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
 224                              unsigned long flags)
 225 {
 226         unsigned long pte_hi = 0;
 227 #ifdef CONFIG_X86_PAE
 228         pte_hi = new_val.pte_high;
 229 #endif
 230         return _hypercall4(int, update_va_mapping, va,
 231                            new_val.pte_low, pte_hi, flags);
 232 }
 233
 234 static inline int
 235 HYPERVISOR_event_channel_op(int cmd, void *arg)
 236 {
 237         int rc = _hypercall2(int, event_channel_op, cmd, arg);
 238         if (unlikely(rc == -ENOSYS)) {
 239                 struct evtchn_op op;
 240                 op.cmd = cmd;
 241                 memcpy(&op.u, arg, sizeof(op.u));
 242                 rc = _hypercall1(int, event_channel_op_compat, &op);
 243                 memcpy(arg, &op.u, sizeof(op.u));
 244         }
 245         return rc;
 246 }
 247
 248 static inline int
 249 HYPERVISOR_xen_version(int cmd, void *arg)
 250 {
 251         return _hypercall2(int, xen_version, cmd, arg);
 252 }
 253
 254 static inline int
 255 HYPERVISOR_console_io(int cmd, int count, char *str)
 256 {
 257         return _hypercall3(int, console_io, cmd, count, str);
 258 }
 259
 260 static inline int
 261 HYPERVISOR_physdev_op(int cmd, void *arg)
 262 {
 263         int rc = _hypercall2(int, physdev_op, cmd, arg);
 264         if (unlikely(rc == -ENOSYS)) {
 265                 struct physdev_op op;
 266                 op.cmd = cmd;
 267                 memcpy(&op.u, arg, sizeof(op.u));
 268                 rc = _hypercall1(int, physdev_op_compat, &op);
 269                 memcpy(arg, &op.u, sizeof(op.u));
 270         }
 271         return rc;
 272 }
 273
 274 static inline int
 275 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
 276 {
 277         return _hypercall3(int, grant_table_op, cmd, uop, count);
 278 }
 279
 280 static inline int
 281 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
 282                                          unsigned long flags, domid_t domid)
 283 {
 284         unsigned long pte_hi = 0;
 285 #ifdef CONFIG_X86_PAE
 286         pte_hi = new_val.pte_high;
 287 #endif
 288         return _hypercall5(int, update_va_mapping_otherdomain, va,
 289                            new_val.pte_low, pte_hi, flags, domid);
 290 }
 291
 292 static inline int
 293 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
 294 {
 295         return _hypercall2(int, vm_assist, cmd, type);
 296 }
 297
 298 static inline int
 299 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
 300 {
 301         return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
 302 }
 303
 304 static inline int
 305 HYPERVISOR_suspend(unsigned long srec)
 306 {
 307         return _hypercall3(int, sched_op, SCHEDOP_shutdown,
 308                            SHUTDOWN_suspend, srec);
 309 }
 310
 311 static inline int
 312 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
 313 {
 314         return _hypercall2(int, nmi_op, op, arg);
 315 }
 316
 317 static inline void
 318 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
 319                         pte_t new_val, unsigned long flags)
 320 {
 321         mcl->op = __HYPERVISOR_update_va_mapping;
 322         mcl->args[0] = va;
 323 #ifdef CONFIG_X86_PAE
 324         mcl->args[1] = new_val.pte_low;
 325         mcl->args[2] = new_val.pte_high;
 326 #else
 327         mcl->args[1] = new_val.pte_low;
 328         mcl->args[2] = 0;
 329 #endif
 330         mcl->args[3] = flags;
 331 }
 332
 333 static inline void
 334 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
 335                      void *uop, unsigned int count)
 336 {
 337         mcl->op = __HYPERVISOR_grant_table_op;
 338         mcl->args[0] = cmd;
 339         mcl->args[1] = (unsigned long)uop;
 340         mcl->args[2] = count;
 341 }
 342
 343 static inline void
 344 MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
 345                                     pte_t new_val, unsigned long flags,
 346                                     domid_t domid)
 347 {
 348         mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
 349         mcl->args[0] = va;
 350 #ifdef CONFIG_X86_PAE
 351         mcl->args[1] = new_val.pte_low;
 352         mcl->args[2] = new_val.pte_high;
 353 #else
 354         mcl->args[1] = new_val.pte_low;
 355         mcl->args[2] = 0;
 356 #endif
 357         mcl->args[3] = flags;
 358         mcl->args[4] = domid;
 359 }
 360
 361 static inline void
 362 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
 363                         struct desc_struct desc)
 364 {
 365         mcl->op = __HYPERVISOR_update_descriptor;
 366         mcl->args[0] = maddr;
 367         mcl->args[1] = maddr >> 32;
 368         mcl->args[2] = desc.a;
 369         mcl->args[3] = desc.b;
 370 }
 371
 372 static inline void
 373 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
 374 {
 375         mcl->op = __HYPERVISOR_memory_op;
 376         mcl->args[0] = cmd;
 377         mcl->args[1] = (unsigned long)arg;
 378 }
 379
 380 static inline void
 381 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
 382                  int count, int *success_count, domid_t domid)
 383 {
 384         mcl->op = __HYPERVISOR_mmu_update;
 385         mcl->args[0] = (unsigned long)req;
 386         mcl->args[1] = count;
 387         mcl->args[2] = (unsigned long)success_count;
 388         mcl->args[3] = domid;
 389 }
 390
 391 static inline void
 392 MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
 393                 int *success_count, domid_t domid)
 394 {
 395         mcl->op = __HYPERVISOR_mmuext_op;
 396         mcl->args[0] = (unsigned long)op;
 397         mcl->args[1] = count;
 398         mcl->args[2] = (unsigned long)success_count;
 399         mcl->args[3] = domid;
 400 }
 401
 402 static inline void
 403 MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
 404 {
 405         mcl->op = __HYPERVISOR_set_gdt;
 406         mcl->args[0] = (unsigned long)frames;
 407         mcl->args[1] = entries;
 408 }
 409
 410 static inline void
 411 MULTI_stack_switch(struct multicall_entry *mcl,
 412                    unsigned long ss, unsigned long esp)
 413 {
 414         mcl->op = __HYPERVISOR_stack_switch;
 415         mcl->args[0] = ss;
 416         mcl->args[1] = esp;
 417 }
 418
 419 #endif /* __HYPERCALL_H__ */