The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/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 file may be distributed separately from the Linux kernel, or
    9  * incorporated into other software packages, subject to the following license:
   10  * 
   11  * Permission is hereby granted, free of charge, to any person obtaining a copy
   12  * of this source file (the "Software"), to deal in the Software without
   13  * restriction, including without limitation the rights to use, copy, modify,
   14  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
   15  * and to permit persons to whom the Software is furnished to do so, subject to
   16  * the following conditions:
   17  * 
   18  * The above copyright notice and this permission notice shall be included in
   19  * all copies or substantial portions of the Software.
   20  * 
   21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   24  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   25  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   26  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   27  * IN THE SOFTWARE.
   28  */
   29 
   30 #ifndef __HYPERCALL_H__
   31 #define __HYPERCALL_H__
   32 
   33 #include <sys/systm.h>
   34 #include <xen/interface/xen.h>
   35 #include <xen/interface/sched.h>
   36 
   37 extern char *hypercall_page;
   38 
   39 #define __STR(x) #x
   40 #define STR(x) __STR(x)
   41 #define ENOXENSYS       38
   42 #define CONFIG_XEN_COMPAT       0x030002
   43 
   44 #define HYPERCALL_STR(name)                                     \
   45         "call hypercall_page + ("STR(__HYPERVISOR_##name)" * 32)"
   46 
   47 #define _hypercall0(type, name)                 \
   48 ({                                              \
   49         long __res;                             \
   50         __asm__ volatile (                          \
   51                 HYPERCALL_STR(name)             \
   52                 : "=a" (__res)                  \
   53                 :                               \
   54                 : "memory" );                   \
   55         (type)__res;                            \
   56 })
   57 
   58 #define _hypercall1(type, name, a1)                             \
   59 ({                                                              \
   60         long __res, __ign1;                                     \
   61         __asm__ volatile (                                          \
   62                 HYPERCALL_STR(name)                             \
   63                 : "=a" (__res), "=b" (__ign1)                   \
   64                 : "1" ((long)(a1))                              \
   65                 : "memory" );                                   \
   66         (type)__res;                                            \
   67 })
   68 
   69 #define _hypercall2(type, name, a1, a2)                         \
   70 ({                                                              \
   71         long __res, __ign1, __ign2;                             \
   72         __asm__ volatile (                                          \
   73                 HYPERCALL_STR(name)                             \
   74                 : "=a" (__res), "=b" (__ign1), "=c" (__ign2)    \
   75                 : "1" ((long)(a1)), "2" ((long)(a2))            \
   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                 HYPERCALL_STR(name)                             \
   85                 : "=a" (__res), "=b" (__ign1), "=c" (__ign2),   \
   86                 "=d" (__ign3)                                   \
   87                 : "1" ((long)(a1)), "2" ((long)(a2)),           \
   88                 "3" ((long)(a3))                                \
   89                 : "memory" );                                   \
   90         (type)__res;                                            \
   91 })
   92 
   93 #define _hypercall4(type, name, a1, a2, a3, a4)                 \
   94 ({                                                              \
   95         long __res, __ign1, __ign2, __ign3, __ign4;             \
   96         __asm__ volatile (                                          \
   97                 HYPERCALL_STR(name)                             \
   98                 : "=a" (__res), "=b" (__ign1), "=c" (__ign2),   \
   99                 "=d" (__ign3), "=S" (__ign4)                    \
  100                 : "1" ((long)(a1)), "2" ((long)(a2)),           \
  101                 "3" ((long)(a3)), "4" ((long)(a4))              \
  102                 : "memory" );                                   \
  103         (type)__res;                                            \
  104 })
  105 
  106 #define _hypercall5(type, name, a1, a2, a3, a4, a5)             \
  107 ({                                                              \
  108         long __res, __ign1, __ign2, __ign3, __ign4, __ign5;     \
  109         __asm__ volatile (                                          \
  110                 HYPERCALL_STR(name)                             \
  111                 : "=a" (__res), "=b" (__ign1), "=c" (__ign2),   \
  112                 "=d" (__ign3), "=S" (__ign4), "=D" (__ign5)     \
  113                 : "1" ((long)(a1)), "2" ((long)(a2)),           \
  114                 "3" ((long)(a3)), "4" ((long)(a4)),             \
  115                 "5" ((long)(a5))                                \
  116                 : "memory" );                                   \
  117         (type)__res;                                            \
  118 })                                                              
  119 
  120 static inline long
  121 privcmd_hypercall(long op, long a1, long a2, long a3, long a4, long a5)
  122 {
  123         long __res, __ign1, __ign2, __ign3, __ign4, __ign5, __call;
  124 
  125         __call = (long)&hypercall_page + (op * 32);
  126         __asm__ volatile (
  127                 "call *%[call]"
  128                 : "=a" (__res), "=b" (__ign1), "=c" (__ign2),
  129                 "=d" (__ign3), "=S" (__ign4), "=D" (__ign5)
  130                 : "1" ((long)(a1)), "2" ((long)(a2)),
  131                 "3" ((long)(a3)), "4" ((long)(a4)),
  132                 "5" ((long)(a5)), [call] "a" (__call)
  133                 : "memory" );
  134 
  135         return __res;
  136 }
  137 
  138 static inline int
  139 HYPERVISOR_set_trap_table(
  140         trap_info_t *table)
  141 {
  142         return _hypercall1(int, set_trap_table, table);
  143 }
  144 
  145 static inline int
  146 HYPERVISOR_mmu_update(
  147         mmu_update_t *req, int count, int *success_count, domid_t domid)
  148 {
  149         return _hypercall4(int, mmu_update, req, count, success_count, domid);
  150 }
  151 
  152 static inline int
  153 HYPERVISOR_mmuext_op(
  154         mmuext_op_t *op, int count, int *success_count, domid_t domid)
  155 {
  156         return _hypercall4(int, mmuext_op, op, count, success_count, domid);
  157 }
  158 
  159 static inline int
  160 HYPERVISOR_set_gdt(
  161         unsigned long *frame_list, int entries)
  162 {
  163         return _hypercall2(int, set_gdt, frame_list, entries);
  164 }
  165 
  166 static inline int
  167 HYPERVISOR_stack_switch(
  168         unsigned long ss, unsigned long esp)
  169 {
  170         return _hypercall2(int, stack_switch, ss, esp);
  171 }
  172 
  173 static inline int
  174 HYPERVISOR_set_callbacks(
  175         unsigned long event_selector, unsigned long event_address,
  176         unsigned long failsafe_selector, unsigned long failsafe_address)
  177 {
  178         return _hypercall4(int, set_callbacks,
  179                            event_selector, event_address,
  180                            failsafe_selector, failsafe_address);
  181 }
  182 
  183 static inline int
  184 HYPERVISOR_fpu_taskswitch(
  185         int set)
  186 {
  187         return _hypercall1(int, fpu_taskswitch, set);
  188 }
  189 
  190 static inline int 
  191 HYPERVISOR_sched_op_compat(
  192         int cmd, unsigned long arg)
  193 {
  194         return _hypercall2(int, sched_op_compat, cmd, arg);
  195 }
  196 
  197 static inline int
  198 HYPERVISOR_sched_op(
  199         int cmd, void *arg)
  200 {
  201         return _hypercall2(int, sched_op, cmd, arg);
  202 }
  203 
  204 static inline long
  205 HYPERVISOR_set_timer_op(
  206         uint64_t timeout)
  207 {
  208         unsigned long timeout_hi = (unsigned long)(timeout>>32);
  209         unsigned long timeout_lo = (unsigned long)timeout;
  210         return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
  211 }
  212 
  213 static inline int
  214 HYPERVISOR_platform_op(
  215         struct xen_platform_op *platform_op)
  216 {
  217         platform_op->interface_version = XENPF_INTERFACE_VERSION;
  218         return _hypercall1(int, platform_op, platform_op);
  219 }
  220 
  221 static inline int
  222 HYPERVISOR_set_debugreg(
  223         int reg, unsigned long value)
  224 {
  225         return _hypercall2(int, set_debugreg, reg, value);
  226 }
  227 
  228 static inline unsigned long
  229 HYPERVISOR_get_debugreg(
  230         int reg)
  231 {
  232         return _hypercall1(unsigned long, get_debugreg, reg);
  233 }
  234 
  235 static inline int
  236 HYPERVISOR_update_descriptor(
  237         uint64_t ma, uint64_t desc)
  238 {
  239         return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
  240 }
  241 
  242 static inline int
  243 HYPERVISOR_memory_op(
  244         unsigned int cmd, void *arg)
  245 {
  246         return _hypercall2(int, memory_op, cmd, arg);
  247 }
  248 
  249 static inline int
  250 HYPERVISOR_multicall(
  251         void *call_list, int nr_calls)
  252 {
  253         return _hypercall2(int, multicall, call_list, nr_calls);
  254 }
  255 
  256 static inline int
  257 HYPERVISOR_update_va_mapping(
  258         unsigned long va, uint64_t new_val, unsigned long flags)
  259 {
  260         uint32_t hi, lo;
  261 
  262         lo = (uint32_t)(new_val & 0xffffffff);
  263         hi = (uint32_t)(new_val >> 32);
  264         
  265         return _hypercall4(int, update_va_mapping, va,
  266                            lo, hi, flags);
  267 }
  268 
  269 static inline int
  270 HYPERVISOR_event_channel_op(
  271         int cmd, void *arg)
  272 {
  273         int rc = _hypercall2(int, event_channel_op, cmd, arg);
  274 
  275 #if CONFIG_XEN_COMPAT <= 0x030002
  276         if (__predict_false(rc == -ENOXENSYS)) {
  277                 struct evtchn_op op;
  278                 op.cmd = cmd;
  279                 memcpy(&op.u, arg, sizeof(op.u));
  280                 rc = _hypercall1(int, event_channel_op_compat, &op);
  281                 memcpy(arg, &op.u, sizeof(op.u));
  282         }
  283 #endif
  284         return (rc);
  285 }
  286 
  287 static inline int
  288 HYPERVISOR_xen_version(
  289         int cmd, void *arg)
  290 {
  291         return _hypercall2(int, xen_version, cmd, arg);
  292 }
  293 
  294 static inline int
  295 HYPERVISOR_console_io(
  296         int cmd, int count, const char *str)
  297 {
  298         return _hypercall3(int, console_io, cmd, count, str);
  299 }
  300 
  301 static inline int
  302 HYPERVISOR_physdev_op(
  303         int cmd, void *arg)
  304 {
  305         int rc = _hypercall2(int, physdev_op, cmd, arg);
  306 #if CONFIG_XEN_COMPAT <= 0x030002
  307         if (__predict_false(rc == -ENOXENSYS)) {
  308                 struct physdev_op op;
  309                 op.cmd = cmd;
  310                 memcpy(&op.u, arg, sizeof(op.u));
  311                 rc = _hypercall1(int, physdev_op_compat, &op);
  312                 memcpy(arg, &op.u, sizeof(op.u));
  313         }
  314 #endif
  315         return (rc);
  316 }
  317 
  318 static inline int
  319 HYPERVISOR_grant_table_op(
  320         unsigned int cmd, void *uop, unsigned int count)
  321 {
  322         return _hypercall3(int, grant_table_op, cmd, uop, count);
  323 }
  324 
  325 static inline int
  326 HYPERVISOR_update_va_mapping_otherdomain(
  327         unsigned long va, uint64_t new_val, unsigned long flags, domid_t domid)
  328 {
  329         uint32_t hi, lo;
  330         
  331         lo = (uint32_t)(new_val & 0xffffffff);
  332         hi = (uint32_t)(new_val >> 32);
  333         
  334         return _hypercall5(int, update_va_mapping_otherdomain, va,
  335                            lo, hi, flags, domid);
  336 }
  337 
  338 static inline int
  339 HYPERVISOR_vm_assist(
  340         unsigned int cmd, unsigned int type)
  341 {
  342         return _hypercall2(int, vm_assist, cmd, type);
  343 }
  344 
  345 static inline int
  346 HYPERVISOR_vcpu_op(
  347         int cmd, int vcpuid, void *extra_args)
  348 {
  349         return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
  350 }
  351 
  352 static inline int
  353 HYPERVISOR_suspend(
  354         unsigned long srec)
  355 {
  356         struct sched_shutdown sched_shutdown = {
  357                 .reason = SHUTDOWN_suspend
  358         };
  359         int rc = _hypercall3(int, sched_op, SCHEDOP_shutdown,
  360                            &sched_shutdown, srec);
  361 #if CONFIG_XEN_COMPAT <= 0x030002
  362         if (rc == -ENOXENSYS)
  363                 rc = _hypercall3(int, sched_op_compat, SCHEDOP_shutdown,
  364                                  SHUTDOWN_suspend, srec);
  365 #endif  
  366         return (rc);
  367 }
  368 
  369 #if CONFIG_XEN_COMPAT <= 0x030002
  370 static inline int
  371 HYPERVISOR_nmi_op(
  372         unsigned long op, void *arg)
  373 {
  374         return _hypercall2(int, nmi_op, op, arg);
  375 }
  376 #endif
  377 
  378 static inline int
  379 HYPERVISOR_callback_op(
  380         int cmd, void *arg)
  381 {
  382         return _hypercall2(int, callback_op, cmd, arg);
  383 }
  384 
  385 #ifndef CONFIG_XEN
  386 static inline unsigned long
  387 HYPERVISOR_hvm_op(
  388     int op, void *arg)
  389 {
  390     return _hypercall2(unsigned long, hvm_op, op, arg);
  391 }
  392 #endif
  393 
  394 static inline int
  395 HYPERVISOR_xenoprof_op(
  396         int op, void *arg)
  397 {
  398         return _hypercall2(int, xenoprof_op, op, arg);
  399 }
  400 
  401 static inline int
  402 HYPERVISOR_kexec_op(
  403         unsigned long op, void *args)
  404 {
  405         return _hypercall2(int, kexec_op, op, args);
  406 }
  407 #endif /* __HYPERCALL_H__ */
  408 
  409 /*
  410  * Local variables:
  411  *  c-file-style: "linux"
  412  *  indent-tabs-mode: t
  413  *  c-indent-level: 8
  414  *  c-basic-offset: 8
  415  *  tab-width: 8
  416  * End:
  417  */

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