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30 * Declaration of a fake device.
33 #ifndef __ISA_FAKE_HH__
34 #define __ISA_FAKE_HH__
38 #include "dev/io_device.hh"
39 #include "mem/packet.hh"
40 #include "params/IsaFake.hh"
43 * IsaFake is a device that returns, BadAddr, 1 or 0 on all reads and
44 * rites. It is meant to be placed at an address range
45 * so that an mcheck doesn't occur when an os probes a piece of hw
46 * that doesn't exist (e.g. UARTs1-3), or catch requests in the memory system
47 * that have no responders..
49 class IsaFake : public BasicPioDevice
58 typedef IsaFakeParams Params;
62 return dynamic_cast<const Params &>(_params);
65 * The constructor for Isa Fake just registers itself with the MMU.
66 * @param p params structure
68 IsaFake(const Params &p);
71 * This read always returns -1.
72 * @param pkt The memory request.
73 * @param data Where to put the data.
75 virtual Tick read(PacketPtr pkt);
78 * All writes are simply ignored.
79 * @param pkt The memory request.
80 * @param data the data to not write.
82 virtual Tick write(PacketPtr pkt);
85 #endif // __ISA_FAKE_HH__