| # Copyright (c) 2021 Huawei International |
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| # |
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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 |