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# Copyright (c) 2021 The Regents of the University of California
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import sst
import sys
import os
from sst import UnitAlgebra
cache_link_latency = "1ps"
bbl = "riscv-boot-exit-nodisk"
cpu_clock_rate = "3GHz"
# gem5 will send requests to physical addresses of range [0x80000000, inf) to memory
# currently, we do not subtract 0x80000000 from the request's address to get the "real" address
# so, the mem_size would always be 2GiB larger than the desired memory size
memory_size_gem5 = "4GiB"
memory_size_sst = "6GiB"
addr_range_end = UnitAlgebra(memory_size_sst).getRoundedValue()
l1_params = {
"access_latency_cycles" : "1",
"cache_frequency" : cpu_clock_rate,
"replacement_policy" : "lru",
"coherence_protocol" : "MESI",
"associativity" : "4",
"cache_line_size" : "64",
"cache_size" : "4 KiB",
"L1" : "1",
}
cpu_params = {
"frequency": cpu_clock_rate,
"cmd": " ../../configs/example/sst/riscv_fs.py --cpu-clock-rate {} --memory-size {}".format(cpu_clock_rate, memory_size_gem5),
"debug_flags": ""
}
gem5_node = sst.Component("gem5_node", "gem5.gem5Component")
gem5_node.addParams(cpu_params)
cache_bus = sst.Component("cache_bus", "memHierarchy.Bus")
cache_bus.addParams( { "bus_frequency" : cpu_clock_rate } )
system_port = gem5_node.setSubComponent("system_port", "gem5.gem5Bridge", 0) # for initialization
system_port.addParams({ "response_receiver_name": "system.system_outgoing_bridge"}) # tell the SubComponent the name of the corresponding SimObject
cache_port = gem5_node.setSubComponent("cache_port", "gem5.gem5Bridge", 0) # SST -> gem5
cache_port.addParams({ "response_receiver_name": "system.memory_outgoing_bridge"})
# L1 cache
l1_cache = sst.Component("l1_cache", "memHierarchy.Cache")
l1_cache.addParams(l1_params)
# Memory
memctrl = sst.Component("memory", "memHierarchy.MemController")
memctrl.addParams({
"debug" : "0",
"clock" : "1GHz",
"request_width" : "64",
"addr_range_end" : addr_range_end, # should be changed accordingly to memory_size_sst
})
memory = memctrl.setSubComponent("backend", "memHierarchy.simpleMem")
memory.addParams({
"access_time" : "30ns",
"mem_size" : memory_size_sst
})
# Connections
# cpu <-> L1
cpu_cache_link = sst.Link("cpu_l1_cache_link")
cpu_cache_link.connect(
(cache_port, "port", cache_link_latency),
(cache_bus, "high_network_0", cache_link_latency)
)
system_cache_link = sst.Link("system_cache_link")
system_cache_link.connect(
(system_port, "port", cache_link_latency),
(cache_bus, "high_network_1", cache_link_latency)
)
cache_bus_cache_link = sst.Link("cache_bus_cache_link")
cache_bus_cache_link.connect(
(cache_bus, "low_network_0", cache_link_latency),
(l1_cache, "high_network_0", cache_link_latency)
)
# L1 <-> mem
cache_mem_link = sst.Link("l1_cache_mem_link")
cache_mem_link.connect(
(l1_cache, "low_network_0", cache_link_latency),
(memctrl, "direct_link", cache_link_latency)
)
# enable Statistics
stat_params = { "rate" : "0ns" }
sst.setStatisticLoadLevel(5)
sst.setStatisticOutput("sst.statOutputTXT", {"filepath" : "./sst-stats.txt"})
sst.enableAllStatisticsForComponentName("l1_cache", stat_params)
sst.enableAllStatisticsForComponentName("memory", stat_params)