xref: /gem5/src/proto/packet.proto

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//
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// Authors: Andreas Hansson

syntax = "proto2";

// Put all the generated messages in a namespace
package ProtoMessage;

// Packet header with the identifier describing what object captured
// the trace, the version of this file format, and the tick frequency
// for all the packet time stamps.
message PacketHeader {
  required string obj_id = 1;
  optional uint32 ver = 2 [default = 0];
  required uint64 tick_freq = 3;

  // This is supposed to be wire equivalent to the "map" construct supported
  // by the proto3 version of the protobuf description syntax. When that
  // becomes widely available, this should be converted over to use it.
  message IdStringEntry {
    optional uint32 key = 1;
    optional string value = 2;
  }

  repeated IdStringEntry id_strings = 4;
}

// Each packet in the trace contains a tick (which can be translated
// to absolute time using the frequency in the header), the command,
// the address, and the size in bytes. The optional flags are used to
// capture the request flags that convey information about
// cacheability, if the packet is an instruction fetch or prefetch or
// not, etc. An optional id field is added for generic use to identify
// the packet or the "owner" of the packet. An example of the latter
// is the sequential id of an instruction, or the master id etc.
// An optional field for PC of the instruction for which this request is made
// is provided.
message Packet {
  required uint64 tick = 1;
  required uint32 cmd = 2;
  required uint64 addr = 3;
  required uint32 size = 4;
  optional uint32 flags = 5;
  optional uint64 pkt_id = 6;
  optional uint64 pc = 7;
}