ArmSystem.py revision 12531:3141027bd11a 
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36# Authors: Ali Saidi
37#          Glenn Bergmans
38
39from m5.params import *
40from m5.SimObject import *
41from m5.util.fdthelper import *
42
43from System import System
44from ArmSemihosting import ArmSemihosting
45
46class ArmMachineType(Enum):
47    map = {
48        'RealViewEB' : 827,
49        'RealViewPBX' : 1901,
50        'VExpress_EMM' : 2272,
51        'VExpress_EMM64' : 2272,
52        'DTOnly' : -1,
53    }
54
55class ArmSystem(System):
56    type = 'ArmSystem'
57    cxx_header = "arch/arm/system.hh"
58    multi_proc = Param.Bool(True, "Multiprocessor system?")
59    boot_loader = VectorParam.String([],
60        "File that contains the boot loader code. Zero or more files may be "
61        "specified. The first boot loader that matches the kernel's "
62        "architecture will be used.")
63    gic_cpu_addr = Param.Addr(0, "Addres of the GIC CPU interface")
64    flags_addr = Param.Addr(0, "Address of the flags register for MP booting")
65    have_security = Param.Bool(False,
66        "True if Security Extensions are implemented")
67    have_virtualization = Param.Bool(False,
68        "True if Virtualization Extensions are implemented")
69    have_lpae = Param.Bool(True, "True if LPAE is implemented")
70    highest_el_is_64 = Param.Bool(False,
71        "True if the register width of the highest implemented exception level "
72        "is 64 bits (ARMv8)")
73    reset_addr_64 = Param.Addr(0x0,
74        "Reset address if the highest implemented exception level is 64 bits "
75        "(ARMv8)")
76    auto_reset_addr_64 = Param.Bool(False,
77        "Determine reset address from kernel entry point if no boot loader")
78    phys_addr_range_64 = Param.UInt8(40,
79        "Supported physical address range in bits when using AArch64 (ARMv8)")
80    have_large_asid_64 = Param.Bool(False,
81        "True if ASID is 16 bits in AArch64 (ARMv8)")
82
83    semihosting = Param.ArmSemihosting(NULL,
84        "Enable support for the Arm semihosting by settings this parameter")
85
86    m5ops_base = Param.Addr(0,
87        "Base of the 64KiB PA range used for memory-mapped m5ops. Set to 0 "
88        "to disable.")
89
90    def generateDeviceTree(self, state):
91        # Generate a device tree root node for the system by creating the root
92        # node and adding the generated subnodes of all children.
93        # When a child needs to add multiple nodes, this is done by also
94        # creating a node called '/' which will then be merged with the
95        # root instead of appended.
96
97        def generateMemNode(mem_range):
98            node = FdtNode("memory@%x" % long(mem_range.start))
99            node.append(FdtPropertyStrings("device_type", ["memory"]))
100            node.append(FdtPropertyWords("reg",
101                state.addrCells(mem_range.start) +
102                state.sizeCells(mem_range.size()) ))
103            return node
104
105        root = FdtNode('/')
106        root.append(state.addrCellsProperty())
107        root.append(state.sizeCellsProperty())
108
109        # Add memory nodes
110        for mem_range in self.mem_ranges:
111            root.append(generateMemNode(mem_range))
112
113        for node in self.recurseDeviceTree(state):
114            # Merge root nodes instead of adding them (for children
115            # that need to add multiple root level nodes)
116            if node.get_name() == root.get_name():
117                root.merge(node)
118            else:
119                root.append(node)
120
121        return root
122
123class GenericArmSystem(ArmSystem):
124    type = 'GenericArmSystem'
125    cxx_header = "arch/arm/system.hh"
126    machine_type = Param.ArmMachineType('DTOnly',
127        "Machine id from http://www.arm.linux.org.uk/developer/machines/")
128    atags_addr = Param.Addr("Address where default atags structure should " \
129                                "be written")
130    dtb_filename = Param.String("",
131        "File that contains the Device Tree Blob. Don't use DTB if empty.")
132    early_kernel_symbols = Param.Bool(False,
133        "enable early kernel symbol tables before MMU")
134    enable_context_switch_stats_dump = Param.Bool(False, "enable stats/task info dumping at context switch boundaries")
135
136    panic_on_panic = Param.Bool(False, "Trigger a gem5 panic if the " \
137                                    "guest kernel panics")
138    panic_on_oops = Param.Bool(False, "Trigger a gem5 panic if the " \
139                                   "guest kernel oopses")
140
141class LinuxArmSystem(GenericArmSystem):
142    type = 'LinuxArmSystem'
143    cxx_header = "arch/arm/linux/system.hh"
144
145    @cxxMethod
146    def dumpDmesg(self):
147        """Dump dmesg from the simulated kernel to standard out"""
148        pass
149
150    # Have Linux systems for ARM auto-calc their load_addr_mask for proper
151    # kernel relocation.
152    load_addr_mask = 0x0
153
154class FreebsdArmSystem(GenericArmSystem):
155    type = 'FreebsdArmSystem'
156    cxx_header = "arch/arm/freebsd/system.hh"
157