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# Copyright (c) 2009 Advanced Micro Devices, Inc.
# Copyright (c) 2020 ARM Limited
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from m5.params import *
from m5.proxy import *
from m5.objects.ClockedObject import ClockedObject

class RubyPort(ClockedObject):
   type = 'RubyPort'
   abstract = True
   cxx_header = "mem/ruby/system/RubyPort.hh"
   version = Param.Int(0, "")

   in_ports = VectorResponsePort("CPU side of this RubyPort/Sequencer. "
               "The CPU request ports should be connected to this. If a CPU "
               "has multiple ports (e.g., I/D ports) all of the ports for a "
               "single CPU can connect to one RubyPort.")
   slave    = DeprecatedParam(in_ports,
                        '`slave` is now called `in_ports`')

   interrupt_out_port = VectorRequestPort("Port to connect to x86 interrupt "
                        "controller to send the CPU requests from outside.")
   master             = DeprecatedParam(interrupt_out_port,
                        '`master` is now called `interrupt_out_port`')

   pio_request_port = RequestPort("Ruby pio request port")
   pio_master_port  = DeprecatedParam(pio_request_port,
                        '`pio_master_port` is now called `pio_request_port`')

   mem_request_port = RequestPort("Ruby mem request port")
   mem_master_port  = DeprecatedParam(mem_request_port,
                        '`mem_master_port` is now called `mem_request_port`')

   pio_response_port = ResponsePort("Ruby pio response port")
   pio_slave_port    = DeprecatedParam(pio_response_port,
                        '`pio_slave_port` is now called `pio_response_port`')

   using_ruby_tester = Param.Bool(False, "")
   no_retry_on_stall = Param.Bool(False, "")
   ruby_system = Param.RubySystem(Parent.any, "")
   system = Param.System(Parent.any, "system object")
   support_data_reqs = Param.Bool(True, "data cache requests supported")
   support_inst_reqs = Param.Bool(True, "inst cache requests supported")
   is_cpu_sequencer = Param.Bool(True, "connected to a cpu")

class RubyPortProxy(RubyPort):
   type = 'RubyPortProxy'
   cxx_header = "mem/ruby/system/RubyPortProxy.hh"

class RubySequencer(RubyPort):
   type = 'RubySequencer'
   cxx_class = 'Sequencer'
   cxx_header = "mem/ruby/system/Sequencer.hh"

   dcache = Param.RubyCache("")

   max_outstanding_requests = Param.Int(16,
       "max requests (incl. prefetches) outstanding")
   deadlock_threshold = Param.Cycles(500000,
       "max outstanding cycles for a request before deadlock/livelock declared")
   garnet_standalone = Param.Bool(False, "")
   # id used by protocols that support multiple sequencers per controller
   # 99 is the dummy default value
   coreid = Param.Int(99, "CorePair core id")

   def connectCpuPorts(self, cpu):
      """
      Helper for connecting all cpu memory request output ports to this
      object's in_ports.
      This assumes the provided cpu object is an instance of BaseCPU. Non-cpu
      objects should use connectInstPort and connectDataPort.
      """
      import m5.objects
      assert(isinstance(cpu, m5.objects.BaseCPU))
      # this connects all cpu mem-side ports to self.in_ports
      cpu.connectAllPorts(self)

   def connectIOPorts(self, piobus):
      """
      Helper for connecting this object's IO request and response ports to the
      provided bus object. Usually a iobus object is used to wireup IO
      components in a full system simulation. Incoming/Outgoing IO requests do
      not go though the SLICC protocol so the iobus must be connected to the
      sequencer directly.
      """
      import m5.defines
      self.pio_request_port = piobus.cpu_side_ports
      self.mem_request_port = piobus.cpu_side_ports
      if m5.defines.buildEnv['TARGET_ISA'] == "x86":
         self.pio_response_port = piobus.mem_side_ports

class RubyHTMSequencer(RubySequencer):
   type = 'RubyHTMSequencer'
   cxx_class = 'HTMSequencer'
   cxx_header = "mem/ruby/system/HTMSequencer.hh"

class DMASequencer(RubyPort):
   type = 'DMASequencer'
   cxx_header = "mem/ruby/system/DMASequencer.hh"
   max_outstanding_requests = Param.Int(64, "max outstanding requests")