isa_fake.hh revision 3502:1ba705a3754b
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: Ali Saidi 29 */ 30 31/** @file 32 * Declaration of a fake device. 33 */ 34 35#ifndef __ISA_FAKE_HH__ 36#define __ISA_FAKE_HH__ 37 38#include "base/range.hh" 39#include "dev/io_device.hh" 40#include "dev/tsunami.hh" 41#include "mem/packet.hh" 42 43/** 44 * IsaFake is a device that returns, BadAddr, 1 or 0 on all reads and 45 * rites. It is meant to be placed at an address range 46 * so that an mcheck doesn't occur when an os probes a piece of hw 47 * that doesn't exist (e.g. UARTs1-3), or catch requests in the memory system 48 * that have no responders.. 49 */ 50class IsaFake : public BasicPioDevice 51{ 52 public: 53 struct Params : public BasicPioDevice::Params 54 { 55 Addr pio_size; 56 bool retBadAddr; 57 uint8_t retData; 58 }; 59 protected: 60 const Params *params() const { return (const Params*)_params; } 61 uint64_t retData; 62 63 public: 64 /** 65 * The constructor for Tsunmami Fake just registers itself with the MMU. 66 * @param p params structure 67 */ 68 IsaFake(Params *p); 69 70 /** 71 * This read always returns -1. 72 * @param pkt The memory request. 73 * @param data Where to put the data. 74 */ 75 virtual Tick read(PacketPtr pkt); 76 77 /** 78 * All writes are simply ignored. 79 * @param pkt The memory request. 80 * @param data the data to not write. 81 */ 82 virtual Tick write(PacketPtr pkt); 83}; 84 85#endif // __ISA_FAKE_HH__ 86