Filename: ///usr/include/linux//um_timetravel.h

/* * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * Copyright (C) 2019 Intel Corporation */ #ifndef _LINUX_UM_TIMETRAVEL_H #define _LINUX_UM_TIMETRAVEL_H #include <linux/types.h> /** * struct um_timetravel_msg - UM time travel message * * This is the basic message type, going in both directions. * * This is the message passed between the host (user-mode Linux instance) * and the calendar (the application on the other side of the socket) in * order to implement common scheduling. * * Whenever UML has an event it will request runtime for it from the * calendar, and then wait for its turn until it can run, etc. Note * that it will only ever request the single next runtime, i.e. multiple * REQUEST messages override each other. */ struct um_timetravel_msg { /** * @op: operation value from &enum um_timetravel_ops */ __u32 op; /** * @seq: sequence number for the message - shall be reflected in * the ACK response, and should be checked while processing * the response to see if it matches */ __u32 seq; /** * @time: time in nanoseconds */ __u64 time; }; /** * enum um_timetravel_ops - Operation codes */ enum um_timetravel_ops { /** * @UM_TIMETRAVEL_ACK: response (ACK) to any previous message, * this usually doesn't carry any data in the 'time' field * unless otherwise specified below */ UM_TIMETRAVEL_ACK = 0, /** * @UM_TIMETRAVEL_START: initialize the connection, the time * field contains an (arbitrary) ID to possibly be able * to distinguish the connections. */ UM_TIMETRAVEL_START = 1, /** * @UM_TIMETRAVEL_REQUEST: request to run at the given time * (host -> calendar) */ UM_TIMETRAVEL_REQUEST = 2, /** * @UM_TIMETRAVEL_WAIT: Indicate waiting for the previously requested * runtime, new requests may be made while waiting (e.g. due to * interrupts); the time field is ignored. The calendar must process * this message and later send a %UM_TIMETRAVEL_RUN message when * the host can run again. * (host -> calendar) */ UM_TIMETRAVEL_WAIT = 3, /** * @UM_TIMETRAVEL_GET: return the current time from the calendar in the * ACK message, the time in the request message is ignored * (host -> calendar) */ UM_TIMETRAVEL_GET = 4, /** * @UM_TIMETRAVEL_UPDATE: time update to the calendar, must be sent e.g. * before kicking an interrupt to another calendar * (host -> calendar) */ UM_TIMETRAVEL_UPDATE = 5, /** * @UM_TIMETRAVEL_RUN: run time request granted, current time is in * the time field * (calendar -> host) */ UM_TIMETRAVEL_RUN = 6, /** * @UM_TIMETRAVEL_FREE_UNTIL: Enable free-running until the given time, * this is a message from the calendar telling the host that it can * freely do its own scheduling for anything before the indicated * time. * Note that if a calendar sends this message once, the host may * assume that it will also do so in the future, if it implements * wraparound semantics for the time field. * (calendar -> host) */ UM_TIMETRAVEL_FREE_UNTIL = 7, /** * @UM_TIMETRAVEL_GET_TOD: Return time of day, typically used once at * boot by the virtual machines to get a synchronized time from * the simulation. */ UM_TIMETRAVEL_GET_TOD = 8, }; #endif /* _LINUX_UM_TIMETRAVEL_H */

./Ninja\.