The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/xen/hypervisor.h

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    1 /******************************************************************************
    2  * hypervisor.h
    3   * 
    4  * Linux-specific hypervisor handling.
    5  * 
    6  * Copyright (c) 2002, K A Fraser
    7  *
    8  * $FreeBSD: releng/8.3/sys/xen/hypervisor.h 199583 2009-11-20 15:27:52Z jhb $
    9  */
   10 
   11 #ifndef __XEN_HYPERVISOR_H__
   12 #define __XEN_HYPERVISOR_H__
   13 
   14 #ifdef XENHVM
   15 
   16 #define is_running_on_xen()     (HYPERVISOR_shared_info != NULL)
   17 
   18 #else
   19 
   20 #define is_running_on_xen() 1
   21 
   22 #endif
   23 
   24 #ifdef PAE
   25 #ifndef CONFIG_X86_PAE
   26 #define CONFIG_X86_PAE
   27 #endif
   28 #endif
   29 
   30 #include <sys/cdefs.h>
   31 #include <sys/systm.h>
   32 #include <xen/interface/xen.h>
   33 #include <xen/interface/platform.h>
   34 #include <xen/interface/event_channel.h>
   35 #include <xen/interface/physdev.h>
   36 #include <xen/interface/sched.h>
   37 #include <xen/interface/callback.h>
   38 #include <xen/interface/memory.h>
   39 #include <machine/xen/hypercall.h>
   40 
   41 #if defined(__amd64__)
   42 #define MULTI_UVMFLAGS_INDEX 2
   43 #define MULTI_UVMDOMID_INDEX 3
   44 #else
   45 #define MULTI_UVMFLAGS_INDEX 3
   46 #define MULTI_UVMDOMID_INDEX 4
   47 #endif
   48 
   49 #ifdef CONFIG_XEN_PRIVILEGED_GUEST
   50 #define is_initial_xendomain() (xen_start_info->flags & SIF_INITDOMAIN)
   51 #else
   52 #define is_initial_xendomain() 0
   53 #endif
   54 
   55 extern start_info_t *xen_start_info;
   56 
   57 extern uint64_t get_system_time(int ticks);
   58 
   59 static inline int 
   60 HYPERVISOR_console_write(char *str, int count)
   61 {
   62     return HYPERVISOR_console_io(CONSOLEIO_write, count, str); 
   63 }
   64 
   65 static inline void HYPERVISOR_crash(void) __dead2;
   66 
   67 static inline int
   68 HYPERVISOR_yield(void)
   69 {
   70         int rc = HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
   71 
   72 #if CONFIG_XEN_COMPAT <= 0x030002
   73         if (rc == -ENOXENSYS)
   74                 rc = HYPERVISOR_sched_op_compat(SCHEDOP_yield, 0);
   75 #endif
   76         return (rc);
   77 }
   78 
   79 static inline int
   80 HYPERVISOR_block(
   81         void)
   82 {
   83         int rc = HYPERVISOR_sched_op(SCHEDOP_block, NULL);
   84 
   85 #if CONFIG_XEN_COMPAT <= 0x030002
   86         if (rc == -ENOXENSYS)
   87                 rc = HYPERVISOR_sched_op_compat(SCHEDOP_block, 0);
   88 #endif
   89         return (rc);
   90 }
   91 
   92 
   93 static inline void 
   94 HYPERVISOR_shutdown(unsigned int reason)
   95 {
   96         struct sched_shutdown sched_shutdown = {
   97                 .reason = reason
   98         };
   99 
  100         HYPERVISOR_sched_op(SCHEDOP_shutdown, &sched_shutdown);
  101 #if CONFIG_XEN_COMPAT <= 0x030002
  102         HYPERVISOR_sched_op_compat(SCHEDOP_shutdown, reason);
  103 #endif
  104 }
  105 
  106 static inline void
  107 HYPERVISOR_crash(void) 
  108 {
  109         HYPERVISOR_shutdown(SHUTDOWN_crash); 
  110         /* NEVER REACHED */
  111         for (;;) ; /* eliminate noreturn error */ 
  112 }
  113 
  114 /* Transfer control to hypervisor until an event is detected on one */
  115 /* of the specified ports or the specified number of ticks elapse */
  116 static inline int
  117 HYPERVISOR_poll(
  118         evtchn_port_t *ports, unsigned int nr_ports, int ticks)
  119 {
  120         int rc;
  121         struct sched_poll sched_poll = {
  122                 .nr_ports = nr_ports,
  123                 .timeout = get_system_time(ticks)
  124         };
  125         set_xen_guest_handle(sched_poll.ports, ports);
  126 
  127         rc = HYPERVISOR_sched_op(SCHEDOP_poll, &sched_poll);
  128 #if CONFIG_XEN_COMPAT <= 0x030002
  129         if (rc == -ENOXENSYS)
  130                 rc = HYPERVISOR_sched_op_compat(SCHEDOP_yield, 0);
  131 #endif  
  132         return (rc);
  133 }
  134 
  135 static inline void
  136 MULTI_update_va_mapping(
  137         multicall_entry_t *mcl, unsigned long va,
  138         uint64_t new_val, unsigned long flags)
  139 {
  140     mcl->op = __HYPERVISOR_update_va_mapping;
  141     mcl->args[0] = va;
  142 #if defined(__amd64__)
  143     mcl->args[1] = new_val;
  144 #elif defined(PAE)
  145     mcl->args[1] = (uint32_t)(new_val & 0xffffffff) ;
  146     mcl->args[2] = (uint32_t)(new_val >> 32);
  147 #else
  148     mcl->args[1] = new_val;
  149     mcl->args[2] = 0;
  150 #endif
  151     mcl->args[MULTI_UVMFLAGS_INDEX] = flags;
  152 }
  153 
  154 #endif /* __XEN_HYPERVISOR_H__ */

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