release/src-rt-6.x.4708/linux/linux-2.6.36/include/xen/interface/sched.h

   1 /******************************************************************************
   2  * sched.h
   3  *
   4  * Scheduler state interactions
   5  *
   6  * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
   7  */
   8
   9 #ifndef __XEN_PUBLIC_SCHED_H__
  10 #define __XEN_PUBLIC_SCHED_H__
  11
  12 #include "event_channel.h"
  13
  14 /*
  15  * The prototype for this hypercall is:
  16  *  long sched_op_new(int cmd, void *arg)
  17  * @cmd == SCHEDOP_??? (scheduler operation).
  18  * @arg == Operation-specific extra argument(s), as described below.
  19  *
  20  * **NOTE**:
  21  * Versions of Xen prior to 3.0.2 provide only the following legacy version
  22  * of this hypercall, supporting only the commands yield, block and shutdown:
  23  *  long sched_op(int cmd, unsigned long arg)
  24  * @cmd == SCHEDOP_??? (scheduler operation).
  25  * @arg == 0               (SCHEDOP_yield and SCHEDOP_block)
  26  *      == SHUTDOWN_* code (SCHEDOP_shutdown)
  27  */
  28
  29 /*
  30  * Voluntarily yield the CPU.
  31  * @arg == NULL.
  32  */
  33 #define SCHEDOP_yield       0
  34
  35 /*
  36  * Block execution of this VCPU until an event is received for processing.
  37  * If called with event upcalls masked, this operation will atomically
  38  * reenable event delivery and check for pending events before blocking the
  39  * VCPU. This avoids a "wakeup waiting" race.
  40  * @arg == NULL.
  41  */
  42 #define SCHEDOP_block       1
  43
  44 /*
  45  * Halt execution of this domain (all VCPUs) and notify the system controller.
  46  * @arg == pointer to sched_shutdown structure.
  47  */
  48 #define SCHEDOP_shutdown    2
  49 struct sched_shutdown {
  50     unsigned int reason; /* SHUTDOWN_* */
  51 };
  52 DEFINE_GUEST_HANDLE_STRUCT(sched_shutdown);
  53
  54 /*
  55  * Poll a set of event-channel ports. Return when one or more are pending. An
  56  * optional timeout may be specified.
  57  * @arg == pointer to sched_poll structure.
  58  */
  59 #define SCHEDOP_poll        3
  60 struct sched_poll {
  61     GUEST_HANDLE(evtchn_port_t) ports;
  62     unsigned int nr_ports;
  63     uint64_t timeout;
  64 };
  65 DEFINE_GUEST_HANDLE_STRUCT(sched_poll);
  66
  67 /*
  68  * Reason codes for SCHEDOP_shutdown. These may be interpreted by control
  69  * software to determine the appropriate action. For the most part, Xen does
  70  * not care about the shutdown code.
  71  */
  72 #define SHUTDOWN_poweroff   0  /* Domain exited normally. Clean up and kill. */
  73 #define SHUTDOWN_reboot     1  /* Clean up, kill, and then restart.          */
  74 #define SHUTDOWN_suspend    2  /* Clean up, save suspend info, kill.         */
  75 #define SHUTDOWN_crash      3  /* Tell controller we've crashed.             */
  76
  77 #endif /* __XEN_PUBLIC_SCHED_H__ */