isa_fake.hh revision 3488:52e909177bfa
1/* 2 * Copyright (c) 2004-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Miguel Serrano 29 * Ali Saidi 30 */ 31 32/** @file 33 * Declaration of a fake device. 34 */ 35 36#ifndef __ISA_FAKE_HH__ 37#define __ISA_FAKE_HH__ 38 39#include "base/range.hh" 40#include "dev/io_device.hh" 41#include "dev/tsunami.hh" 42#include "mem/packet.hh" 43 44/** 45 * IsaFake is a device that returns -1 on all reads and 46 * accepts all writes. It is meant to be placed at an address range 47 * so that an mcheck doesn't occur when an os probes a piece of hw 48 * that doesn't exist (e.g. UARTs1-3). 49 */ 50class IsaFake : public BasicPioDevice 51{ 52 public: 53 struct Params : public BasicPioDevice::Params 54 { 55 Addr pio_size; 56 }; 57 protected: 58 const Params *params() const { return (const Params*)_params; } 59 60 public: 61 /** 62 * The constructor for Tsunmami Fake just registers itself with the MMU. 63 * @param p params structure 64 */ 65 IsaFake(Params *p); 66 67 /** 68 * This read always returns -1. 69 * @param pkt The memory request. 70 * @param data Where to put the data. 71 */ 72 virtual Tick read(PacketPtr pkt); 73 74 /** 75 * All writes are simply ignored. 76 * @param pkt The memory request. 77 * @param data the data to not write. 78 */ 79 virtual Tick write(PacketPtr pkt); 80}; 81 82/** 83 * BadAddr is a device that fills the packet's result field with "BadAddress". 84 * @todo: Consider consolidating with IsaFake and similar classes. 85 */ 86class BadAddr : public BasicPioDevice 87{ 88 public: 89 struct Params : public BasicPioDevice::Params 90 { 91 }; 92 93 BadAddr(Params *p); 94 virtual void init(); 95 virtual Tick read(PacketPtr pkt); 96 virtual Tick write(PacketPtr pkt); 97}; 98 99#endif // __TSUNAMI_FAKE_HH__ 100