示例#1
0
文件: Pc.py 项目: johnnycck/gem5
class Pc(Platform):
    type = 'Pc'
    cxx_header = "dev/x86/pc.hh"
    cxx_class = 'gem5::Pc'
    system = Param.System(Parent.any, "system")

    south_bridge = Param.SouthBridge(SouthBridge(), "Southbridge")
    pci_host = PcPciHost()

    # Serial port and terminal
    com_1 = Uart8250()
    com_1.pio_addr = x86IOAddress(0x3f8)
    com_1.device = Terminal()

    # Devices to catch access to non-existant serial ports.
    fake_com_2 = IsaFake(pio_addr=x86IOAddress(0x2f8), pio_size=8)
    fake_com_3 = IsaFake(pio_addr=x86IOAddress(0x3e8), pio_size=8)
    fake_com_4 = IsaFake(pio_addr=x86IOAddress(0x2e8), pio_size=8)

    # A device to catch accesses to the non-existant floppy controller.
    fake_floppy = IsaFake(pio_addr=x86IOAddress(0x3f2), pio_size=2)

    # A bus for accesses not claimed by a specific device.
    default_bus = IOXBar()

    # A device to handle accesses to unclaimed IO ports.
    empty_isa = IsaFake(pio_addr=x86IOAddress(0),
                        pio_size='64KiB',
                        ret_data8=0,
                        ret_data16=0,
                        ret_data32=0,
                        ret_data64=0,
                        pio=default_bus.mem_side_ports)

    # A device to handle any other type of unclaimed access.
    bad_addr = BadAddr(pio=default_bus.default)

    def attachIO(self, bus, dma_ports=[]):
        self.south_bridge.attachIO(bus, dma_ports)
        self.com_1.pio = bus.mem_side_ports
        self.fake_com_2.pio = bus.mem_side_ports
        self.fake_com_3.pio = bus.mem_side_ports
        self.fake_com_4.pio = bus.mem_side_ports
        self.fake_floppy.pio = bus.mem_side_ports
        self.pci_host.pio = bus.mem_side_ports

        self.default_bus.cpu_side_ports = bus.default
示例#2
0
class Pc(Platform):
    type = 'Pc'
    cxx_header = "dev/x86/pc.hh"
    system = Param.System(Parent.any, "system")

    south_bridge = SouthBridge()
    pci_host = PcPciHost()

    # "Non-existant" ports used for timing purposes by the linux kernel
    i_dont_exist1 = IsaFake(pio_addr=x86IOAddress(0x80), pio_size=1)
    i_dont_exist2 = IsaFake(pio_addr=x86IOAddress(0xed), pio_size=1)

    # Ports behind the pci config and data regsiters. These don't do anything,
    # but the linux kernel fiddles with them anway.
    behind_pci = IsaFake(pio_addr=x86IOAddress(0xcf8), pio_size=8)

    # Serial port and terminal
    com_1 = Uart8250()
    com_1.pio_addr = x86IOAddress(0x3f8)
    com_1.device = Terminal()

    # Devices to catch access to non-existant serial ports.
    fake_com_2 = IsaFake(pio_addr=x86IOAddress(0x2f8), pio_size=8)
    fake_com_3 = IsaFake(pio_addr=x86IOAddress(0x3e8), pio_size=8)
    fake_com_4 = IsaFake(pio_addr=x86IOAddress(0x2e8), pio_size=8)

    # A device to catch accesses to the non-existant floppy controller.
    fake_floppy = IsaFake(pio_addr=x86IOAddress(0x3f2), pio_size=2)

    # NVMe Interface
    nvme = NVMeInterface(pci_func=0, pci_dev=5, pci_bus=0)

    def attachIO(self, bus, dma_ports=[]):
        self.south_bridge.attachIO(bus, dma_ports)
        self.i_dont_exist1.pio = bus.master
        self.i_dont_exist2.pio = bus.master
        self.behind_pci.pio = bus.master
        self.com_1.pio = bus.master
        self.fake_com_2.pio = bus.master
        self.fake_com_3.pio = bus.master
        self.fake_com_4.pio = bus.master
        self.fake_floppy.pio = bus.master
        self.pci_host.pio = bus.default
        self.nvme.pio = bus.master
        if dma_ports.count(self.nvme.dma) == 0:
            self.nvme.dma = bus.slave
示例#3
0
class VExpress_EMM(RealView):
    _mem_regions = [ AddrRange('2GB', size='2GB') ]

    # Ranges based on excluding what is part of on-chip I/O (gic,
    # a9scu)
    _off_chip_ranges = [AddrRange(0x2F000000, size='16MB'),
                        AddrRange(0x30000000, size='256MB'),
                        AddrRange(0x40000000, size='512MB'),
                        AddrRange(0x18000000, size='64MB'),
                        AddrRange(0x1C000000, size='64MB')]

    # Platform control device (off-chip)
    realview_io = RealViewCtrl(proc_id0=0x14000000, proc_id1=0x14000000,
                               idreg=0x02250000, pio_addr=0x1C010000)

    mcc = VExpressMCC()
    dcc = CoreTile2A15DCC()

    ### On-chip devices ###
    gic = Gic400(dist_addr=0x2C001000, cpu_addr=0x2C002000)
    vgic   = VGic(vcpu_addr=0x2c006000, hv_addr=0x2c004000, maint_int=25)

    local_cpu_timer = CpuLocalTimer(int_timer=ArmPPI(num=29),
                                    int_watchdog=ArmPPI(num=30),
                                    pio_addr=0x2C080000)

    hdlcd  = HDLcd(pxl_clk=dcc.osc_pxl,
                   pio_addr=0x2b000000, int_num=117,
                   workaround_swap_rb=True)

    def _on_chip_devices(self):
        devices = [
            self.gic, self.vgic,
            self.local_cpu_timer
        ]
        if hasattr(self, "gicv2m"):
            devices.append(self.gicv2m)
        devices.append(self.hdlcd)
        return devices

    def _on_chip_memory(self):
        memories = [
            self.bootmem,
        ]
        return memories

    ### Off-chip devices ###
    uart = Pl011(pio_addr=0x1c090000, int_num=37)
    pci_host = GenericPciHost(
        conf_base=0x30000000, conf_size='256MB', conf_device_bits=16,
        pci_pio_base=0)

    generic_timer = GenericTimer(int_phys_s=ArmPPI(num=29),
                                 int_phys_ns=ArmPPI(num=30),
                                 int_virt=ArmPPI(num=27),
                                 int_hyp=ArmPPI(num=26))

    timer0 = Sp804(int_num0=34, int_num1=34, pio_addr=0x1C110000, clock0='1MHz', clock1='1MHz')
    timer1 = Sp804(int_num0=35, int_num1=35, pio_addr=0x1C120000, clock0='1MHz', clock1='1MHz')
    clcd   = Pl111(pio_addr=0x1c1f0000, int_num=46)
    kmi0   = Pl050(pio_addr=0x1c060000, int_num=44, ps2=PS2Keyboard())
    kmi1   = Pl050(pio_addr=0x1c070000, int_num=45, ps2=PS2TouchKit())
    cf_ctrl = IdeController(disks=[], pci_func=0, pci_dev=0, pci_bus=2,
                            io_shift = 2, ctrl_offset = 2, Command = 0x1,
                            BAR0 = 0x1C1A0000, BAR0Size = '256B',
                            BAR1 = 0x1C1A0100, BAR1Size = '4096B',
                            BAR0LegacyIO = True, BAR1LegacyIO = True)

    bootmem        = SimpleMemory(range = AddrRange('64MB'),
                                  conf_table_reported = False)
    vram           = SimpleMemory(range = AddrRange(0x18000000, size='32MB'),
                                  conf_table_reported = False)
    rtc            = PL031(pio_addr=0x1C170000, int_num=36)

    l2x0_fake      = IsaFake(pio_addr=0x2C100000, pio_size=0xfff)
    uart1_fake     = AmbaFake(pio_addr=0x1C0A0000)
    uart2_fake     = AmbaFake(pio_addr=0x1C0B0000)
    uart3_fake     = AmbaFake(pio_addr=0x1C0C0000)
    sp810_fake     = AmbaFake(pio_addr=0x1C020000, ignore_access=True)
    watchdog_fake  = AmbaFake(pio_addr=0x1C0F0000)
    aaci_fake      = AmbaFake(pio_addr=0x1C040000)
    lan_fake       = IsaFake(pio_addr=0x1A000000, pio_size=0xffff)
    usb_fake       = IsaFake(pio_addr=0x1B000000, pio_size=0x1ffff)
    mmc_fake       = AmbaFake(pio_addr=0x1c050000)
    energy_ctrl    = EnergyCtrl(pio_addr=0x1c080000)

    def _off_chip_devices(self):
        devices = [
            self.uart,
            self.realview_io,
            self.pci_host,
            self.timer0,
            self.timer1,
            self.clcd,
            self.kmi0,
            self.kmi1,
            self.cf_ctrl,
            self.rtc,
            self.vram,
            self.l2x0_fake,
            self.uart1_fake,
            self.uart2_fake,
            self.uart3_fake,
            self.sp810_fake,
            self.watchdog_fake,
            self.aaci_fake,
            self.lan_fake,
            self.usb_fake,
            self.mmc_fake,
            self.energy_ctrl,
        ]
        # Try to attach the I/O if it exists
        if hasattr(self, "ide"):
            devices.append(self.ide)
        if hasattr(self, "ethernet"):
            devices.append(self.ethernet)
        return devices

    # Attach any PCI devices that are supported
    def attachPciDevices(self):
        self.ethernet = IGbE_e1000(pci_bus=0, pci_dev=0, pci_func=0,
                                   InterruptLine=1, InterruptPin=1)
        self.ide = IdeController(disks = [], pci_bus=0, pci_dev=1, pci_func=0,
                                 InterruptLine=2, InterruptPin=2)

    def enableMSIX(self):
        self.gic = Gic400(dist_addr=0x2C001000, cpu_addr=0x2C002000,
                          it_lines=512)
        self.gicv2m = Gicv2m()
        self.gicv2m.frames = [Gicv2mFrame(spi_base=256, spi_len=64, addr=0x2C1C0000)]

    def setupBootLoader(self, cur_sys, loc):
        if not cur_sys.boot_loader:
            cur_sys.boot_loader = loc('boot_emm.arm')
        cur_sys.atags_addr = 0x8000000
        cur_sys.load_offset = 0x80000000
示例#4
0
class RealViewPBX(RealView):
    uart = Pl011(pio_addr=0x10009000, int_num=44)
    realview_io = RealViewCtrl(pio_addr=0x10000000)
    mcc = VExpressMCC()
    dcc = CoreTile2A15DCC()
    gic = Gic400(cpu_addr=0x1f000100, dist_addr=0x1f001000, cpu_size=0x100)
    pci_host = GenericPciHost(
        conf_base=0x30000000, conf_size='256MB', conf_device_bits=16,
        pci_pio_base=0)
    timer0 = Sp804(int_num0=36, int_num1=36, pio_addr=0x10011000)
    timer1 = Sp804(int_num0=37, int_num1=37, pio_addr=0x10012000)
    global_timer = A9GlobalTimer(int_num=27, pio_addr=0x1f000200)
    local_cpu_timer = CpuLocalTimer(int_timer=ArmPPI(num=29),
                                    int_watchdog=ArmPPI(num=30),
                                    pio_addr=0x1f000600)
    clcd = Pl111(pio_addr=0x10020000, int_num=55)
    kmi0   = Pl050(pio_addr=0x10006000, int_num=52, ps2=PS2Keyboard())
    kmi1   = Pl050(pio_addr=0x10007000, int_num=53, ps2=PS2TouchKit())
    a9scu  = A9SCU(pio_addr=0x1f000000)
    cf_ctrl = IdeController(disks=[], pci_func=0, pci_dev=7, pci_bus=2,
                            io_shift = 1, ctrl_offset = 2, Command = 0x1,
                            BAR0 = 0x18000000, BAR0Size = '16B',
                            BAR1 = 0x18000100, BAR1Size = '1B',
                            BAR0LegacyIO = True, BAR1LegacyIO = True)


    l2x0_fake     = IsaFake(pio_addr=0x1f002000, pio_size=0xfff)
    flash_fake    = IsaFake(pio_addr=0x40000000, pio_size=0x20000000,
                            fake_mem=True)
    dmac_fake     = AmbaFake(pio_addr=0x10030000)
    uart1_fake    = AmbaFake(pio_addr=0x1000a000)
    uart2_fake    = AmbaFake(pio_addr=0x1000b000)
    uart3_fake    = AmbaFake(pio_addr=0x1000c000)
    smc_fake      = AmbaFake(pio_addr=0x100e1000)
    sp810_fake    = AmbaFake(pio_addr=0x10001000, ignore_access=True)
    watchdog_fake = AmbaFake(pio_addr=0x10010000)
    gpio0_fake    = AmbaFake(pio_addr=0x10013000)
    gpio1_fake    = AmbaFake(pio_addr=0x10014000)
    gpio2_fake    = AmbaFake(pio_addr=0x10015000)
    ssp_fake      = AmbaFake(pio_addr=0x1000d000)
    sci_fake      = AmbaFake(pio_addr=0x1000e000)
    aaci_fake     = AmbaFake(pio_addr=0x10004000)
    mmc_fake      = AmbaFake(pio_addr=0x10005000)
    rtc           = PL031(pio_addr=0x10017000, int_num=42)
    energy_ctrl   = EnergyCtrl(pio_addr=0x1000f000)


    # Attach I/O devices that are on chip and also set the appropriate
    # ranges for the bridge
    def attachOnChipIO(self, bus, bridge):
       self.gic.pio = bus.master
       self.l2x0_fake.pio = bus.master
       self.a9scu.pio = bus.master
       self.global_timer.pio = bus.master
       self.local_cpu_timer.pio = bus.master
       # Bridge ranges based on excluding what is part of on-chip I/O
       # (gic, l2x0, a9scu, local_cpu_timer)
       bridge.ranges = [AddrRange(self.realview_io.pio_addr,
                                  self.a9scu.pio_addr - 1),
                        AddrRange(self.flash_fake.pio_addr,
                                  self.flash_fake.pio_addr + \
                                  self.flash_fake.pio_size - 1)]

    # Set the clock domain for IO objects that are considered
    # to be "close" to the cores.
    def onChipIOClkDomain(self, clkdomain):
        self.gic.clk_domain             = clkdomain
        self.l2x0_fake.clk_domain       = clkdomain
        self.a9scu.clkdomain            = clkdomain
        self.local_cpu_timer.clk_domain = clkdomain

    # Attach I/O devices to specified bus object.  Can't do this
    # earlier, since the bus object itself is typically defined at the
    # System level.
    def attachIO(self, bus):
       self.uart.pio          = bus.master
       self.realview_io.pio   = bus.master
       self.pci_host.pio      = bus.master
       self.timer0.pio        = bus.master
       self.timer1.pio        = bus.master
       self.clcd.pio          = bus.master
       self.clcd.dma          = bus.slave
       self.kmi0.pio          = bus.master
       self.kmi1.pio          = bus.master
       self.cf_ctrl.pio       = bus.master
       self.cf_ctrl.dma       = bus.slave
       self.dmac_fake.pio     = bus.master
       self.uart1_fake.pio    = bus.master
       self.uart2_fake.pio    = bus.master
       self.uart3_fake.pio    = bus.master
       self.smc_fake.pio      = bus.master
       self.sp810_fake.pio    = bus.master
       self.watchdog_fake.pio = bus.master
       self.gpio0_fake.pio    = bus.master
       self.gpio1_fake.pio    = bus.master
       self.gpio2_fake.pio    = bus.master
       self.ssp_fake.pio      = bus.master
       self.sci_fake.pio      = bus.master
       self.aaci_fake.pio     = bus.master
       self.mmc_fake.pio      = bus.master
       self.rtc.pio           = bus.master
       self.flash_fake.pio    = bus.master
       self.energy_ctrl.pio   = bus.master

    # Set the clock domain for IO objects that are considered
    # to be "far" away from the cores.
    def offChipIOClkDomain(self, clkdomain):
        self.uart.clk_domain          = clkdomain
        self.realview_io.clk_domain   = clkdomain
        self.timer0.clk_domain        = clkdomain
        self.timer1.clk_domain        = clkdomain
        self.clcd.clk_domain          = clkdomain
        self.kmi0.clk_domain          = clkdomain
        self.kmi1.clk_domain          = clkdomain
        self.cf_ctrl.clk_domain       = clkdomain
        self.dmac_fake.clk_domain     = clkdomain
        self.uart1_fake.clk_domain    = clkdomain
        self.uart2_fake.clk_domain    = clkdomain
        self.uart3_fake.clk_domain    = clkdomain
        self.smc_fake.clk_domain      = clkdomain
        self.sp810_fake.clk_domain    = clkdomain
        self.watchdog_fake.clk_domain = clkdomain
        self.gpio0_fake.clk_domain    = clkdomain
        self.gpio1_fake.clk_domain    = clkdomain
        self.gpio2_fake.clk_domain    = clkdomain
        self.ssp_fake.clk_domain      = clkdomain
        self.sci_fake.clk_domain      = clkdomain
        self.aaci_fake.clk_domain     = clkdomain
        self.mmc_fake.clk_domain      = clkdomain
        self.rtc.clk_domain           = clkdomain
        self.flash_fake.clk_domain    = clkdomain
        self.energy_ctrl.clk_domain   = clkdomain
示例#5
0
class Tsunami(Platform):
    type = 'Tsunami'
    cxx_header = "dev/alpha/tsunami.hh"
    system = Param.System(Parent.any, "system")

    cchip = TsunamiCChip(pio_addr=0x801a0000000)
    pchip = TsunamiPChip(pio_addr=0x80180000000)
    fake_sm_chip = IsaFake(pio_addr=0x801fc000370)

    fake_uart1 = IsaFake(pio_addr=0x801fc0002f8)
    fake_uart2 = IsaFake(pio_addr=0x801fc0003e8)
    fake_uart3 = IsaFake(pio_addr=0x801fc0002e8)
    fake_uart4 = IsaFake(pio_addr=0x801fc0003f0)

    fake_ppc = IsaFake(pio_addr=0x801fc0003bb)

    fake_OROM = IsaFake(pio_addr=0x800000a0000, pio_size=0x60000)

    fake_pnp_addr = IsaFake(pio_addr=0x801fc000279)
    fake_pnp_write = IsaFake(pio_addr=0x801fc000a79)
    fake_pnp_read0 = IsaFake(pio_addr=0x801fc000203)
    fake_pnp_read1 = IsaFake(pio_addr=0x801fc000243)
    fake_pnp_read2 = IsaFake(pio_addr=0x801fc000283)
    fake_pnp_read3 = IsaFake(pio_addr=0x801fc0002c3)
    fake_pnp_read4 = IsaFake(pio_addr=0x801fc000303)
    fake_pnp_read5 = IsaFake(pio_addr=0x801fc000343)
    fake_pnp_read6 = IsaFake(pio_addr=0x801fc000383)
    fake_pnp_read7 = IsaFake(pio_addr=0x801fc0003c3)

    fake_ata0 = IsaFake(pio_addr=0x801fc0001f0)
    fake_ata1 = IsaFake(pio_addr=0x801fc000170)

    fb = BadDevice(pio_addr=0x801fc0003d0, devicename='FrameBuffer')
    io = TsunamiIO(pio_addr=0x801fc000000)
    uart = Uart8250(pio_addr=0x801fc0003f8)
    backdoor = AlphaBackdoor(pio_addr=0x80200000000, disk=Parent.simple_disk)

    # Attach I/O devices to specified bus object.  Can't do this
    # earlier, since the bus object itself is typically defined at the
    # System level.
    def attachIO(self, bus):
        self.cchip.pio = bus.master
        self.pchip.pio = bus.master
        self.fake_sm_chip.pio = bus.master
        self.fake_uart1.pio = bus.master
        self.fake_uart2.pio = bus.master
        self.fake_uart3.pio = bus.master
        self.fake_uart4.pio = bus.master
        self.fake_ppc.pio = bus.master
        self.fake_OROM.pio = bus.master
        self.fake_pnp_addr.pio = bus.master
        self.fake_pnp_write.pio = bus.master
        self.fake_pnp_read0.pio = bus.master
        self.fake_pnp_read1.pio = bus.master
        self.fake_pnp_read2.pio = bus.master
        self.fake_pnp_read3.pio = bus.master
        self.fake_pnp_read4.pio = bus.master
        self.fake_pnp_read5.pio = bus.master
        self.fake_pnp_read6.pio = bus.master
        self.fake_pnp_read7.pio = bus.master
        self.fake_ata0.pio = bus.master
        self.fake_ata1.pio = bus.master
        self.fb.pio = bus.master
        self.io.pio = bus.master
        self.uart.pio = bus.master
        self.backdoor.pio = bus.master
示例#6
0
class T1000(Platform):
    type = 'T1000'
    cxx_header = "dev/sparc/t1000.hh"
    system = Param.System(Parent.any, "system")

    fake_clk = IsaFake(pio_addr=0x9600000000, pio_size=0x100000000)
    #warn_access="Accessing Clock Unit -- Unimplemented!")

    fake_membnks = IsaFake(pio_addr=0x9700000000,
                           pio_size=16384,
                           ret_data64=0x0000000000000000,
                           update_data=False)
    #warn_access="Accessing Memory Banks -- Unimplemented!")

    fake_jbi = IsaFake(pio_addr=0x8000000000, pio_size=0x100000000)
    #warn_access="Accessing JBI -- Unimplemented!")

    fake_l2_1 = IsaFake(pio_addr=0xA900000000,
                        pio_size=0x8,
                        ret_data64=0x0000000000000001,
                        update_data=True)
    #warn_access="Accessing L2 Cache Banks -- Unimplemented!")

    fake_l2_2 = IsaFake(pio_addr=0xA900000040,
                        pio_size=0x8,
                        ret_data64=0x0000000000000001,
                        update_data=True)
    #warn_access="Accessing L2 Cache Banks -- Unimplemented!")

    fake_l2_3 = IsaFake(pio_addr=0xA900000080,
                        pio_size=0x8,
                        ret_data64=0x0000000000000001,
                        update_data=True)
    #warn_access="Accessing L2 Cache Banks -- Unimplemented!")

    fake_l2_4 = IsaFake(pio_addr=0xA9000000C0,
                        pio_size=0x8,
                        ret_data64=0x0000000000000001,
                        update_data=True)
    #warn_access="Accessing L2 Cache Banks -- Unimplemented!")

    fake_l2esr_1 = IsaFake(pio_addr=0xAB00000000,
                           pio_size=0x8,
                           ret_data64=0x0000000000000000,
                           update_data=True)
    #warn_access="Accessing L2 ESR Cache Banks -- Unimplemented!")

    fake_l2esr_2 = IsaFake(pio_addr=0xAB00000040,
                           pio_size=0x8,
                           ret_data64=0x0000000000000000,
                           update_data=True)
    #warn_access="Accessing L2 ESR Cache Banks -- Unimplemented!")

    fake_l2esr_3 = IsaFake(pio_addr=0xAB00000080,
                           pio_size=0x8,
                           ret_data64=0x0000000000000000,
                           update_data=True)
    #warn_access="Accessing L2 ESR Cache Banks -- Unimplemented!")

    fake_l2esr_4 = IsaFake(pio_addr=0xAB000000C0,
                           pio_size=0x8,
                           ret_data64=0x0000000000000000,
                           update_data=True)
    #warn_access="Accessing L2 ESR Cache Banks -- Unimplemented!")

    fake_ssi = IsaFake(pio_addr=0xff00000000, pio_size=0x10000000)
    #warn_access="Accessing SSI -- Unimplemented!")

    hterm = Terminal()
    hvuart = Uart8250(pio_addr=0xfff0c2c000)
    htod = DumbTOD()

    pterm = Terminal()
    puart0 = Uart8250(pio_addr=0x1f10000000)

    iob = Iob()

    # Attach I/O devices that are on chip
    def attachOnChipIO(self, bus):
        self.iob.pio = bus.master
        self.htod.pio = bus.master

    # Attach I/O devices to specified bus object.  Can't do this
    # earlier, since the bus object itself is typically defined at the
    # System level.
    def attachIO(self, bus):
        self.hvuart.device = self.hterm
        self.puart0.device = self.pterm
        self.fake_clk.pio = bus.master
        self.fake_membnks.pio = bus.master
        self.fake_l2_1.pio = bus.master
        self.fake_l2_2.pio = bus.master
        self.fake_l2_3.pio = bus.master
        self.fake_l2_4.pio = bus.master
        self.fake_l2esr_1.pio = bus.master
        self.fake_l2esr_2.pio = bus.master
        self.fake_l2esr_3.pio = bus.master
        self.fake_l2esr_4.pio = bus.master
        self.fake_ssi.pio = bus.master
        self.fake_jbi.pio = bus.master
        self.puart0.pio = bus.master
        self.hvuart.pio = bus.master