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# Copyright (c) 2021 Huawei International
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from m5.objects.Device import BasicPioDevice
from m5.objects.IntPin import IntSinkPin
from m5.params import *
from m5.proxy import *
from m5.util.fdthelper import *
class Clint(BasicPioDevice):
"""
This implementation of CLINT is based on
the SiFive U54MC datasheet:
https://sifive.cdn.prismic.io/sifive/fab000f6-
0e07-48d0-9602-e437d5367806_sifive_U54MC_rtl_
full_20G1.03.00_manual.pdf
"""
type = "Clint"
cxx_header = "dev/riscv/clint.hh"
cxx_class = "gem5::Clint"
int_pin = IntSinkPin("Pin to receive RTC signal")
pio_size = Param.Addr(0xC000, "PIO Size")
num_threads = Param.Int("Number of threads in the system.")
def generateDeviceTree(self, state):
node = self.generateBasicPioDeviceNode(
state, "clint", self.pio_addr, self.pio_size
)
cpus = self.system.unproxy(self).cpu
int_extended = list()
for cpu in cpus:
phandle = state.phandle(cpu)
int_extended.append(phandle)
int_extended.append(0x3)
int_extended.append(phandle)
int_extended.append(0x7)
node.append(FdtPropertyWords("interrupts-extended", int_extended))
node.appendCompatible(["riscv,clint0"])
yield node