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# Authors: Ali Saidi

from m5.params import *
from m5.SimObject import *

from System import System

class ArmMachineType(Enum):
    map = {
        'RealViewEB' : 827,
        'RealViewPBX' : 1901,
        'VExpress_EMM' : 2272,
        'VExpress_EMM64' : 2272,
        'DTOnly' : -1,
    }

class ArmSystem(System):
    type = 'ArmSystem'
    cxx_header = "arch/arm/system.hh"
    load_addr_mask = 0xffffffff
    multi_proc = Param.Bool(True, "Multiprocessor system?")
    boot_loader = VectorParam.String([],
        "File that contains the boot loader code. Zero or more files may be "
        "specified. The first boot loader that matches the kernel's "
        "architecture will be used.")
    gic_cpu_addr = Param.Addr(0, "Addres of the GIC CPU interface")
    flags_addr = Param.Addr(0, "Address of the flags register for MP booting")
    have_security = Param.Bool(False,
        "True if Security Extensions are implemented")
    have_virtualization = Param.Bool(False,
        "True if Virtualization Extensions are implemented")
    have_lpae = Param.Bool(True, "True if LPAE is implemented")
    highest_el_is_64 = Param.Bool(False,
        "True if the register width of the highest implemented exception level "
        "is 64 bits (ARMv8)")
    reset_addr_64 = Param.Addr(0x0,
        "Reset address if the highest implemented exception level is 64 bits "
        "(ARMv8)")
    phys_addr_range_64 = Param.UInt8(40,
        "Supported physical address range in bits when using AArch64 (ARMv8)")
    have_large_asid_64 = Param.Bool(False,
        "True if ASID is 16 bits in AArch64 (ARMv8)")

    m5ops_base = Param.Addr(0,
        "Base of the 64KiB PA range used for memory-mapped m5ops. Set to 0 "
        "to disable.")

class GenericArmSystem(ArmSystem):
    type = 'GenericArmSystem'
    cxx_header = "arch/arm/system.hh"
    load_addr_mask = 0x0fffffff
    machine_type = Param.ArmMachineType('DTOnly',
        "Machine id from http://www.arm.linux.org.uk/developer/machines/")
    atags_addr = Param.Addr("Address where default atags structure should " \
                                "be written")
    dtb_filename = Param.String("",
        "File that contains the Device Tree Blob. Don't use DTB if empty.")
    early_kernel_symbols = Param.Bool(False,
        "enable early kernel symbol tables before MMU")
    enable_context_switch_stats_dump = Param.Bool(False, "enable stats/task info dumping at context switch boundaries")

    panic_on_panic = Param.Bool(False, "Trigger a gem5 panic if the " \
                                    "guest kernel panics")
    panic_on_oops = Param.Bool(False, "Trigger a gem5 panic if the " \
                                   "guest kernel oopses")

class LinuxArmSystem(GenericArmSystem):
    type = 'LinuxArmSystem'
    cxx_header = "arch/arm/linux/system.hh"

    @cxxMethod
    def dumpDmesg(self):
        """Dump dmesg from the simulated kernel to standard out"""
        pass

class FreebsdArmSystem(GenericArmSystem):
    type = 'FreebsdArmSystem'
    cxx_header = "arch/arm/freebsd/system.hh"