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32 * Declaration of a fake device.
35 #ifndef __ISA_FAKE_HH__
36 #define __ISA_FAKE_HH__
40 #include "dev/io_device.hh"
41 // #include "dev/alpha/tsunami.hh"
42 #include "mem/packet.hh"
43 #include "params/IsaFake.hh"
46 * IsaFake is a device that returns, BadAddr, 1 or 0 on all reads and
47 * rites. It is meant to be placed at an address range
48 * so that an mcheck doesn't occur when an os probes a piece of hw
49 * that doesn't exist (e.g. UARTs1-3), or catch requests in the memory system
50 * that have no responders..
52 class IsaFake : public BasicPioDevice
61 typedef IsaFakeParams Params;
65 return dynamic_cast<const Params *>(_params);
68 * The constructor for Isa Fake just registers itself with the MMU.
69 * @param p params structure
74 * This read always returns -1.
75 * @param pkt The memory request.
76 * @param data Where to put the data.
78 virtual Tick read(PacketPtr pkt);
81 * All writes are simply ignored.
82 * @param pkt The memory request.
83 * @param data the data to not write.
85 virtual Tick write(PacketPtr pkt);
88 #endif // __ISA_FAKE_HH__