sys/xen/hypervisor.h

   1 /******************************************************************************
   2  * hypervisor.h
   3   *
   4  * Linux-specific hypervisor handling.
   5  *
   6  * Copyright (c) 2002, K A Fraser
   7  *
   8  * $FreeBSD$
   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__ */