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# Copyright (c) 2021 Huawei International
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from m5.objects.Platform import Platform
from m5.objects.PMAChecker import PMAChecker
from m5.objects.Clint import Clint
from m5.objects.Plic import Plic
from m5.objects.RTC import RiscvRTC
from m5.objects.Uart import RiscvUart8250
from m5.objects.Terminal import Terminal
from m5.params import *
from m5.proxy import *
from m5.util.fdthelper import *
class HiFive(Platform):
"""HiFive Platform
Implementation:
This is the base class for SiFive's HiFive
board series. It contains the CLINT and PLIC
interrupt controllers, Uart and Disk.
Implementation details are based on SiFive
FU540-C000. https://sifive.cdn.prismic.io/
sifive/b5e7a29c-d3c2-44ea-85fb-acc1df282e2
1_FU540-C000-v1p3.pdf
Setup:
The following sections outline the required
setup for a RISC-V HiFive platform. See
configs/example/riscv/fs_linux.py for example.
Driving CLINT:
CLINT has an interrupt pin which increments
mtime. It can be connected to any interrupt
source pin which acts as the RTCCLK pin. An
abstract RTC wrapper called RiscvRTC can be
used.
Attaching PLIC devices:
PLIC handles external interrupts. Interrupt
PioDevices should inherit from PlicIntDevice
(PCI and DMA not yet implemented). It contains
a parameter interrupt_id which should be used
to call platform->postPciInt(id).
All PLIC interrupt devices should be returned
by _off_chip_devices(). Calling attachPlic sets
up the PLIC interrupt source count.
Uart:
The HiFive platform also has an uart_int_id.
This is because Uart8250 uses postConsoleInt
instead of postPciInt. In the future if a Uart
that inherits PlicIntDevice is implemented,
this can be removed.
Disk:
See fs_linux.py for setup example.
PMAChecker:
The PMAChecker will be attached to the MMU of
each CPU (which allows them to differ). See
fs_linux.py for setup example.
"""
type = 'HiFive'
cxx_header = "dev/riscv/hifive.hh"
cxx_class = 'gem5::HiFive'
# CLINT
clint = Param.Clint(Clint(pio_addr=0x2000000), "CLINT")
# PLIC
plic = Param.Plic(Plic(pio_addr=0xc000000), "PLIC")
# Uart
uart = RiscvUart8250(pio_addr=0x10000000)
# Int source ID to redirect console interrupts to
# Set to 0 if using a pci interrupt for Uart instead
uart_int_id = Param.Int(0xa, "PLIC Uart interrupt ID")
terminal = Terminal()
def _on_chip_devices(self):
"""Returns a list of on-chip peripherals
"""
return [
self.clint,
self.plic
]
def _off_chip_devices(self):
"""Returns a list of off-chip peripherals
"""
devices = [self.uart]
if hasattr(self, "disk"):
devices.append(self.disk)
return devices
def _on_chip_ranges(self):
"""Returns a list of on-chip peripherals
address range
"""
return [
AddrRange(dev.pio_addr, size=dev.pio_size)
for dev in self._on_chip_devices()
]
def _off_chip_ranges(self):
"""Returns a list of off-chip peripherals
address range
"""
return [
AddrRange(dev.pio_addr, size=dev.pio_size)
for dev in self._off_chip_devices()
]
def attachPlic(self):
"""Count number of PLIC interrupt sources
"""
plic_srcs = [self.uart_int_id]
for device in self._off_chip_devices():
if hasattr(device, "interrupt_id"):
plic_srcs.append(device.interrupt_id)
self.plic.n_src = max(plic_srcs) + 1
def attachOnChipIO(self, bus):
"""Attach on-chip IO devices, needs modification
to support DMA and PCI
"""
for device in self._on_chip_devices():
device.pio = bus.mem_side_ports
def attachOffChipIO(self, bus):
"""Attach off-chip IO devices, needs modification
to support DMA and PCI
"""
for device in self._off_chip_devices():
device.pio = bus.mem_side_ports
def setNumCores(self, num_cpu):
""" Sets the PLIC and CLINT to have the right number of threads and
contexts. Assumes that the cores have a single hardware thread.
"""
self.plic.n_contexts = num_cpu * 2
self.clint.num_threads = num_cpu
def generateDeviceTree(self, state):
cpus_node = FdtNode("cpus")
cpus_node.append(FdtPropertyWords("timebase-frequency", [10000000]))
yield cpus_node
node = FdtNode("soc")
local_state = FdtState(addr_cells=2, size_cells=2)
node.append(local_state.addrCellsProperty())
node.append(local_state.sizeCellsProperty())
node.append(FdtProperty("ranges"))
node.appendCompatible(["simple-bus"])
for subnode in self.recurseDeviceTree(local_state):
node.append(subnode)
yield node
# For generating devicetree
_cpu_count = 0
def annotateCpuDeviceNode(self, cpu, state):
cpu.append(FdtPropertyStrings('mmu-type', 'riscv,sv48'))
cpu.append(FdtPropertyStrings('status', 'okay'))
cpu.append(FdtPropertyStrings('riscv,isa', 'rv64imafdcsu'))
cpu.appendCompatible(["riscv"])
int_node = FdtNode("interrupt-controller")
int_state = FdtState(interrupt_cells=1)
int_node.append(int_state.interruptCellsProperty())
int_node.append(FdtProperty("interrupt-controller"))
int_node.appendCompatible("riscv,cpu-intc")
cpus = self.system.unproxy(self).cpu
phandle = int_state.phandle(cpus[self._cpu_count])
self._cpu_count += 1
int_node.append(FdtPropertyWords("phandle", [phandle]))
cpu.append(int_node)