src/arch/arm/ArmSystem.py

   1 # Copyright (c) 2009, 2012-2013, 2015-2019 ARM Limited
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  35
  36 from m5.params import *
  37 from m5.options import *
  38 from m5.SimObject import *
  39 from m5.util.fdthelper import *
  40
  41 from m5.objects.System import System
  42 from m5.objects.ArmSemihosting import ArmSemihosting
  43
  44 class ArmMachineType(Enum):
  45     map = {
  46         'VExpress_EMM' : 2272,
  47         'VExpress_EMM64' : 2272,
  48         'DTOnly' : -1,
  49     }
  50
  51 class SveVectorLength(UInt8): min = 1; max = 16
  52
  53 class ArmSystem(System):
  54     type = 'ArmSystem'
  55     cxx_header = "arch/arm/system.hh"
  56     multi_proc = Param.Bool(True, "Multiprocessor system?")
  57     boot_loader = VectorParam.String([],
  58         "File that contains the boot loader code. Zero or more files may be "
  59         "specified. The first boot loader that matches the kernel's "
  60         "architecture will be used.")
  61     gic_cpu_addr = Param.Addr(0, "Addres of the GIC CPU interface")
  62     flags_addr = Param.Addr(0, "Address of the flags register for MP booting")
  63     have_security = Param.Bool(False,
  64         "True if Security Extensions are implemented")
  65     have_virtualization = Param.Bool(False,
  66         "True if Virtualization Extensions are implemented")
  67     have_crypto = Param.Bool(False,
  68         "True if Crypto Extensions is implemented")
  69     have_lpae = Param.Bool(True, "True if LPAE is implemented")
  70     reset_addr = Param.Addr(0x0,
  71         "Reset address (ARMv8)")
  72     auto_reset_addr = Param.Bool(False,
  73         "Determine reset address from kernel entry point if no boot loader")
  74     highest_el_is_64 = Param.Bool(False,
  75         "True if the register width of the highest implemented exception level "
  76         "is 64 bits (ARMv8)")
  77     phys_addr_range_64 = Param.UInt8(40,
  78         "Supported physical address range in bits when using AArch64 (ARMv8)")
  79     have_large_asid_64 = Param.Bool(False,
  80         "True if ASID is 16 bits in AArch64 (ARMv8)")
  81     have_sve = Param.Bool(True,
  82         "True if SVE is implemented (ARMv8)")
  83     sve_vl = Param.SveVectorLength(1,
  84         "SVE vector length in quadwords (128-bit)")
  85     have_lse = Param.Bool(True,
  86         "True if LSE is implemented (ARMv8.1)")
  87     have_pan = Param.Bool(True,
  88         "True if Priviledge Access Never is implemented (ARMv8.1)")
  89
  90     semihosting = Param.ArmSemihosting(NULL,
  91         "Enable support for the Arm semihosting by settings this parameter")
  92
  93     dtb_filename = Param.String("",
  94         "File that contains the Device Tree Blob. Don't use DTB if empty.")
  95
  96     def generateDtb(self, outdir, filename):
  97         """
  98         Autogenerate DTB. Arguments are the folder where the DTB
  99         will be stored, and the name of the DTB file.
 100         """
 101         state = FdtState(addr_cells=2, size_cells=2, cpu_cells=1)
 102         rootNode = self.generateDeviceTree(state)
 103
 104         fdt = Fdt()
 105         fdt.add_rootnode(rootNode)
 106         dtb_filename = os.path.join(outdir, filename)
 107         self.dtb_filename = fdt.writeDtbFile(dtb_filename)
 108
 109
 110     def generateDeviceTree(self, state):
 111         # Generate a device tree root node for the system by creating the root
 112         # node and adding the generated subnodes of all children.
 113         # When a child needs to add multiple nodes, this is done by also
 114         # creating a node called '/' which will then be merged with the
 115         # root instead of appended.
 116
 117         def generateMemNode(mem_range):
 118             node = FdtNode("memory@%x" % long(mem_range.start))
 119             node.append(FdtPropertyStrings("device_type", ["memory"]))
 120             node.append(FdtPropertyWords("reg",
 121                 state.addrCells(mem_range.start) +
 122                 state.sizeCells(mem_range.size()) ))
 123             return node
 124
 125         root = FdtNode('/')
 126         root.append(state.addrCellsProperty())
 127         root.append(state.sizeCellsProperty())
 128
 129         # Add memory nodes
 130         for mem_range in self.mem_ranges:
 131             root.append(generateMemNode(mem_range))
 132
 133         for node in self.recurseDeviceTree(state):
 134             # Merge root nodes instead of adding them (for children
 135             # that need to add multiple root level nodes)
 136             if node.get_name() == root.get_name():
 137                 root.merge(node)
 138             else:
 139                 root.append(node)
 140
 141         return root
 142
 143 class GenericArmSystem(ArmSystem):
 144     type = 'GenericArmSystem'
 145     cxx_header = "arch/arm/system.hh"
 146     machine_type = Param.ArmMachineType('DTOnly',
 147         "Machine id from http://www.arm.linux.org.uk/developer/machines/")
 148     atags_addr = Param.Addr("Address where default atags structure should " \
 149                                 "be written")
 150     early_kernel_symbols = Param.Bool(False,
 151         "enable early kernel symbol tables before MMU")
 152     enable_context_switch_stats_dump = Param.Bool(False,
 153         "enable stats/task info dumping at context switch boundaries")
 154
 155     panic_on_panic = Param.Bool(False, "Trigger a gem5 panic if the " \
 156                                     "guest kernel panics")
 157     panic_on_oops = Param.Bool(False, "Trigger a gem5 panic if the " \
 158                                    "guest kernel oopses")
 159
 160 class LinuxArmSystem(GenericArmSystem):
 161     type = 'LinuxArmSystem'
 162     cxx_header = "arch/arm/linux/system.hh"
 163
 164     @cxxMethod
 165     def dumpDmesg(self):
 166         """Dump dmesg from the simulated kernel to standard out"""
 167         pass
 168
 169     # Have Linux systems for ARM auto-calc their load_addr_mask for proper
 170     # kernel relocation.
 171     load_addr_mask = 0x0
 172
 173 class FreebsdArmSystem(GenericArmSystem):
 174     type = 'FreebsdArmSystem'
 175     cxx_header = "arch/arm/freebsd/system.hh"