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')