src/dev/qemu/QemuFwCfg.py

# Copyright 2022 Google, Inc.
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from m5.params import *
from m5.objects.SimObject import SimObject
from m5.objects.Device import PioDevice


class QemuFwCfgItem(SimObject):
    type = "QemuFwCfgItem"
    cxx_class = "gem5::qemu::FwCfgItemFactoryBase"
    cxx_header = "dev/qemu/fw_cfg.hh"
    abstract = True

    # The path this item will be listed under in the firmware config directory.
    arch_specific = Param.Bool(False, "if this item is archiecture specific")
    index = Param.Unsigned(0, "Fixed index, or 0 for automatic")
    path = Param.String("Path to item in the firmware config directory")


class QemuFwCfgItemFile(QemuFwCfgItem):
    type = "QemuFwCfgItemFile"
    cxx_class = "gem5::qemu::FwCfgItemFactory<gem5::qemu::FwCfgItemFile>"
    cxx_template_params = ["class ItemType"]
    cxx_header = "dev/qemu/fw_cfg.hh"

    # The path to the file that will be used to populate this item.
    file = Param.String("Path to file to export")


class QemuFwCfgItemString(QemuFwCfgItem):
    type = "QemuFwCfgItemString"
    cxx_class = "gem5::qemu::FwCfgItemFactory<gem5::qemu::FwCfgItemString>"
    cxx_template_params = ["class ItemType"]
    cxx_header = "dev/qemu/fw_cfg.hh"

    # The string which directly populates this item.
    string = Param.String("String to export")


class QemuFwCfgItemBytes(QemuFwCfgItem):
    type = "QemuFwCfgItemBytes"
    cxx_class = "gem5::qemu::FwCfgItemFactory<gem5::qemu::FwCfgItemBytes>"
    cxx_template_params = ["class ItemType"]
    cxx_header = "dev/qemu/fw_cfg.hh"

    data = VectorParam.UInt8("Bytes to export")


class QemuFwCfg(PioDevice):
    type = "QemuFwCfg"
    cxx_class = "gem5::qemu::FwCfg"
    cxx_header = "dev/qemu/fw_cfg.hh"
    abstract = True

    items = VectorParam.QemuFwCfgItem(
        [], "Items exported by the firmware config device"
    )


class QemuFwCfgIo(QemuFwCfg):
    type = "QemuFwCfgIo"
    cxx_class = "gem5::qemu::FwCfgIo"
    cxx_header = "dev/qemu/fw_cfg.hh"

    # The selector register is 16 bits wide, and little endian. The data
    # register must be one port ahead of the selector.
    selector_addr = Param.Addr("IO port for the selector register")


class QemuFwCfgMmio(QemuFwCfg):
    type = "QemuFwCfgMmio"
    cxx_class = "gem5::qemu::FwCfgMmio"
    cxx_header = "dev/qemu/fw_cfg.hh"

    # The selector register is 16 bits wide, and big endian.
    selector_addr = Param.Addr("Memory address for the selector register")

    # The data register is 8, 16, 32 or 64 bits wide.
    data_addr_range = Param.AddrRange(
        "Memory address range for the data register"
    )