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from m5.params import *
from m5.options import *
from m5.SimObject import *
from m5.util.fdthelper import *

from m5.objects.System import System
from m5.objects.ArmSemihosting import ArmSemihosting

class SveVectorLength(UInt8): min = 1; max = 16

class ArmSystem(System):
    type = 'ArmSystem'
    cxx_header = "arch/arm/system.hh"
    cxx_class = 'gem5::ArmSystem'

    multi_proc = Param.Bool(True, "Multiprocessor system?")
    gic_cpu_addr = Param.Addr(0, "Addres of the GIC CPU interface")
    have_security = Param.Bool(False,
        "True if Security Extensions are implemented")
    have_virtualization = Param.Bool(False,
        "True if Virtualization Extensions are implemented")
    have_crypto = Param.Bool(False,
        "True if Crypto Extensions is implemented")
    have_lpae = Param.Bool(True, "True if LPAE is implemented")
    reset_addr = Param.Addr(0x0,
        "Reset address (ARMv8)")
    auto_reset_addr = Param.Bool(True,
        "Determine reset address from kernel entry point if no boot loader")
    highest_el_is_64 = Param.Bool(True,
        "True if the register width of 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)")
    have_sve = Param.Bool(True,
        "True if SVE is implemented (ARMv8)")
    sve_vl = Param.SveVectorLength(1,
        "SVE vector length in quadwords (128-bit)")
    have_lse = Param.Bool(True,
        "True if LSE is implemented (ARMv8.1)")
    have_vhe = Param.Bool(False,
        "True if FEAT_VHE (Virtualization Host Extensions) is implemented")
    have_pan = Param.Bool(True,
        "True if Priviledge Access Never is implemented (ARMv8.1)")
    have_secel2 = Param.Bool(True,
        "True if Secure EL2 is implemented (ARMv8)")
    have_tme = Param.Bool(False,
        "True if transactional memory extension (TME) is implemented")
    semihosting = Param.ArmSemihosting(NULL,
        "Enable support for the Arm semihosting by settings this parameter")

    # Set to true if simulation provides a PSCI implementation
    # This flag will be checked when auto-generating
    # a PSCI node. A client (e.g Linux) would then be able to
    # know if it can use the PSCI APIs
    _have_psci = False

    def generateDtb(self, filename):
        """
        Autogenerate DTB. Arguments are the folder where the DTB
        will be stored, and the name of the DTB file.
        """
        state = FdtState(addr_cells=2, size_cells=2, cpu_cells=1)
        rootNode = self.generateDeviceTree(state)

        fdt = Fdt()
        fdt.add_rootnode(rootNode)
        fdt.writeDtbFile(filename)


    def generateDeviceTree(self, state):
        # Generate a device tree root node for the system by creating the root
        # node and adding the generated subnodes of all children.
        # When a child needs to add multiple nodes, this is done by also
        # creating a node called '/' which will then be merged with the
        # root instead of appended.

        def generateMemNode(mem_range):
            node = FdtNode("memory@%x" % int(mem_range.start))
            node.append(FdtPropertyStrings("device_type", ["memory"]))
            node.append(FdtPropertyWords("reg",
                state.addrCells(mem_range.start) +
                state.sizeCells(mem_range.size()) ))
            return node

        root = FdtNode('/')
        root.append(state.addrCellsProperty())
        root.append(state.sizeCellsProperty())

        # Add memory nodes
        for mem_range in self.mem_ranges:
            root.append(generateMemNode(mem_range))

        for node in self.recurseDeviceTree(state):
            # Merge root nodes instead of adding them (for children
            # that need to add multiple root level nodes)
            if node.get_name() == root.get_name():
                root.merge(node)
            else:
                root.append(node)

        return root