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# Copyright (c) 2021 Huawei International
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from m5.objects.Device import BasicPioDevice
from m5.params import *
from m5.proxy import *
from m5.util.fdthelper import *
class Plic(BasicPioDevice):
"""
This implementation of PLIC 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 = "Plic"
cxx_header = "dev/riscv/plic.hh"
cxx_class = "gem5::Plic"
pio_size = Param.Addr(0x4000000, "PIO Size")
n_src = Param.Int("Number of interrupt sources")
n_contexts = Param.Int(
"Number of interrupt contexts. Usually the number "
"of threads * 2. One for M mode, one for S mode"
)
def generateDeviceTree(self, state):
node = self.generateBasicPioDeviceNode(
state, "plic", self.pio_addr, self.pio_size
)
int_state = FdtState(addr_cells=0, interrupt_cells=1)
node.append(int_state.addrCellsProperty())
node.append(int_state.interruptCellsProperty())
phandle = int_state.phandle(self)
node.append(FdtPropertyWords("phandle", [phandle]))
node.append(FdtPropertyWords("riscv,ndev", [self.n_src - 1]))
cpus = self.system.unproxy(self).cpu
int_extended = list()
for cpu in cpus:
phandle = int_state.phandle(cpu)
int_extended.append(phandle)
int_extended.append(0xB)
int_extended.append(phandle)
int_extended.append(0x9)
node.append(FdtPropertyWords("interrupts-extended", int_extended))
node.append(FdtProperty("interrupt-controller"))
node.appendCompatible(["riscv,plic0"])
yield node