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# Copyright (c) 2012, 2015-2017 ARM Limited
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#
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from m5.SimObject import SimObject
from m5.params import *
from m5.proxy import *
# Enumerate set of allowed power states that can be used by a clocked object.
# The list is kept generic to express a base minimal set.
# State definition :-
# Undefined: Invalid state, no power state derived information is available.
# On: The logic block is actively running and consuming dynamic and leakage
# energy depending on the amount of processing required.
# Clk_gated: The clock circuity within the block is gated to save dynamic
# energy, the power supply to the block is still on and leakage
# energy is being consumed by the block.
# Sram_retention: The SRAMs within the logic blocks are pulled into retention
# state to reduce leakage energy further.
# Off: The logic block is power gated and is not consuming any energy.
class PwrState(Enum):
vals = ["UNDEFINED", "ON", "CLK_GATED", "SRAM_RETENTION", "OFF"]
class PowerState(SimObject):
type = "PowerState"
cxx_header = "sim/power_state.hh"
cxx_class = "gem5::PowerState"
# Provide initial power state, should ideally get redefined in startup
# routine
default_state = Param.PwrState("UNDEFINED", "Default Power State")
# Possible power states this object can be in sorted from the most
# to the least performant
possible_states = VectorParam.PwrState(
[], "Power states this object can be in"
)
clk_gate_min = Param.Latency("1ns", "Min value of the distribution")
clk_gate_max = Param.Latency("1s", "Max value of the distribution")
clk_gate_bins = Param.Unsigned("20", "# bins in clk gated distribution")
# The objects which drive the power state of this object. If the list is
# empty, the object determines its power state independently.
leaders = VectorParam.PowerState(
[], "Objects which drive the power state of this object"
)