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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 __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_fpu_taskswitch(int set)
 168 {
 169         return _hypercall1(int, fpu_taskswitch, set);
 170 }
 171
 172 static inline int
 173 HYPERVISOR_sched_op(int cmd, unsigned long arg)
 174 {
 175         return _hypercall2(int, sched_op, cmd, arg);
 176 }
 177
 178 static inline long
 179 HYPERVISOR_set_timer_op(u64 timeout)
 180 {
 181         unsigned long timeout_hi = (unsigned long)(timeout>>32);
 182         unsigned long timeout_lo = (unsigned long)timeout;
 183         return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
 184 }
 185
 186 static inline int
 187 HYPERVISOR_set_debugreg(int reg, unsigned long value)
 188 {
 189         return _hypercall2(int, set_debugreg, reg, value);
 190 }
 191
 192 static inline unsigned long
 193 HYPERVISOR_get_debugreg(int reg)
 194 {
 195         return _hypercall1(unsigned long, get_debugreg, reg);
 196 }
 197
 198 static inline int
 199 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
 200 {
 201         return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
 202 }
 203
 204 static inline int
 205 HYPERVISOR_memory_op(unsigned int cmd, void *arg)
 206 {
 207         return _hypercall2(int, memory_op, cmd, arg);
 208 }
 209
 210 static inline int
 211 HYPERVISOR_multicall(void *call_list, int nr_calls)
 212 {
 213         return _hypercall2(int, multicall, call_list, nr_calls);
 214 }
 215
 216 static inline int
 217 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
 218                              unsigned long flags)
 219 {
 220         unsigned long pte_hi = 0;
 221 #ifdef CONFIG_X86_PAE
 222         pte_hi = new_val.pte_high;
 223 #endif
 224         return _hypercall4(int, update_va_mapping, va,
 225                            new_val.pte_low, pte_hi, flags);
 226 }
 227
 228 static inline int
 229 HYPERVISOR_event_channel_op(int cmd, void *arg)
 230 {
 231         int rc = _hypercall2(int, event_channel_op, cmd, arg);
 232         if (unlikely(rc == -ENOSYS)) {
 233                 struct evtchn_op op;
 234                 op.cmd = cmd;
 235                 memcpy(&op.u, arg, sizeof(op.u));
 236                 rc = _hypercall1(int, event_channel_op_compat, &op);
 237                 memcpy(arg, &op.u, sizeof(op.u));
 238         }
 239         return rc;
 240 }
 241
 242 static inline int
 243 HYPERVISOR_xen_version(int cmd, void *arg)
 244 {
 245         return _hypercall2(int, xen_version, cmd, arg);
 246 }
 247
 248 static inline int
 249 HYPERVISOR_console_io(int cmd, int count, char *str)
 250 {
 251         return _hypercall3(int, console_io, cmd, count, str);
 252 }
 253
 254 static inline int
 255 HYPERVISOR_physdev_op(int cmd, void *arg)
 256 {
 257         int rc = _hypercall2(int, physdev_op, cmd, arg);
 258         if (unlikely(rc == -ENOSYS)) {
 259                 struct physdev_op op;
 260                 op.cmd = cmd;
 261                 memcpy(&op.u, arg, sizeof(op.u));
 262                 rc = _hypercall1(int, physdev_op_compat, &op);
 263                 memcpy(arg, &op.u, sizeof(op.u));
 264         }
 265         return rc;
 266 }
 267
 268 static inline int
 269 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
 270 {
 271         return _hypercall3(int, grant_table_op, cmd, uop, count);
 272 }
 273
 274 static inline int
 275 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
 276                                          unsigned long flags, domid_t domid)
 277 {
 278         unsigned long pte_hi = 0;
 279 #ifdef CONFIG_X86_PAE
 280         pte_hi = new_val.pte_high;
 281 #endif
 282         return _hypercall5(int, update_va_mapping_otherdomain, va,
 283                            new_val.pte_low, pte_hi, flags, domid);
 284 }
 285
 286 static inline int
 287 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
 288 {
 289         return _hypercall2(int, vm_assist, cmd, type);
 290 }
 291
 292 static inline int
 293 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
 294 {
 295         return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
 296 }
 297
 298 static inline int
 299 HYPERVISOR_suspend(unsigned long srec)
 300 {
 301         return _hypercall3(int, sched_op, SCHEDOP_shutdown,
 302                            SHUTDOWN_suspend, srec);
 303 }
 304
 305 static inline int
 306 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
 307 {
 308         return _hypercall2(int, nmi_op, op, arg);
 309 }
 310
 311 static inline void
 312 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
 313                         pte_t new_val, unsigned long flags)
 314 {
 315         mcl->op = __HYPERVISOR_update_va_mapping;
 316         mcl->args[0] = va;
 317 #ifdef CONFIG_X86_PAE
 318         mcl->args[1] = new_val.pte_low;
 319         mcl->args[2] = new_val.pte_high;
 320 #else
 321         mcl->args[1] = new_val.pte_low;
 322         mcl->args[2] = 0;
 323 #endif
 324         mcl->args[3] = flags;
 325 }
 326
 327 static inline void
 328 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
 329                      void *uop, unsigned int count)
 330 {
 331         mcl->op = __HYPERVISOR_grant_table_op;
 332         mcl->args[0] = cmd;
 333         mcl->args[1] = (unsigned long)uop;
 334         mcl->args[2] = count;
 335 }
 336
 337 static inline void
 338 MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
 339                                     pte_t new_val, unsigned long flags,
 340                                     domid_t domid)
 341 {
 342         mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
 343         mcl->args[0] = va;
 344 #ifdef CONFIG_X86_PAE
 345         mcl->args[1] = new_val.pte_low;
 346         mcl->args[2] = new_val.pte_high;
 347 #else
 348         mcl->args[1] = new_val.pte_low;
 349         mcl->args[2] = 0;
 350 #endif
 351         mcl->args[3] = flags;
 352         mcl->args[4] = domid;
 353 }
 354
 355 static inline void
 356 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
 357                         struct desc_struct desc)
 358 {
 359         mcl->op = __HYPERVISOR_update_descriptor;
 360         mcl->args[0] = maddr;
 361         mcl->args[1] = maddr >> 32;
 362         mcl->args[2] = desc.a;
 363         mcl->args[3] = desc.b;
 364 }
 365
 366 static inline void
 367 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
 368 {
 369         mcl->op = __HYPERVISOR_memory_op;
 370         mcl->args[0] = cmd;
 371         mcl->args[1] = (unsigned long)arg;
 372 }
 373
 374 static inline void
 375 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
 376                  int count, int *success_count, domid_t domid)
 377 {
 378         mcl->op = __HYPERVISOR_mmu_update;
 379         mcl->args[0] = (unsigned long)req;
 380         mcl->args[1] = count;
 381         mcl->args[2] = (unsigned long)success_count;
 382         mcl->args[3] = domid;
 383 }
 384
 385 static inline void
 386 MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
 387                 int *success_count, domid_t domid)
 388 {
 389         mcl->op = __HYPERVISOR_mmuext_op;
 390         mcl->args[0] = (unsigned long)op;
 391         mcl->args[1] = count;
 392         mcl->args[2] = (unsigned long)success_count;
 393         mcl->args[3] = domid;
 394 }
 395 #endif /* __HYPERCALL_H__ */