backdoor.hh revision 5480
12SN/A/* 21762SN/A * Copyright (c) 2001-2005 The Regents of The University of Michigan 32SN/A * All rights reserved. 42SN/A * 52SN/A * Redistribution and use in source and binary forms, with or without 62SN/A * modification, are permitted provided that the following conditions are 72SN/A * met: redistributions of source code must retain the above copyright 82SN/A * notice, this list of conditions and the following disclaimer; 92SN/A * redistributions in binary form must reproduce the above copyright 102SN/A * notice, this list of conditions and the following disclaimer in the 112SN/A * documentation and/or other materials provided with the distribution; 122SN/A * neither the name of the copyright holders nor the names of its 132SN/A * contributors may be used to endorse or promote products derived from 142SN/A * this software without specific prior written permission. 152SN/A * 162SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 172SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 182SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 192SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 202SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 212SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 222SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 232SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 242SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 252SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 262SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 272665SN/A * 282665SN/A * Authors: Nathan Binkert 292SN/A */ 302SN/A 311722SN/A/** @file 325480Snate@binkert.org * System Console Backdoor Interface 332SN/A */ 342SN/A 355480Snate@binkert.org#ifndef __DEV_ALPHA_BACKDOOR_HH__ 365480Snate@binkert.org#define __DEV_ALPHA_BACKDOOR_HH__ 372SN/A 38540SN/A#include "base/range.hh" 393534SN/A#include "dev/alpha/access.h" 40545SN/A#include "dev/io_device.hh" 415480Snate@binkert.org#include "params/AlphaBackdoor.hh" 4256SN/A#include "sim/host.hh" 43843SN/A#include "sim/sim_object.hh" 442SN/A 452SN/Aclass BaseCPU; 465478SN/Aclass Terminal; 472158SN/Aclass AlphaSystem; 482SN/Aclass SimpleDisk; 492SN/A 501722SN/A/** 512SN/A * Memory mapped interface to the system console. This device 522SN/A * represents a shared data region between the OS Kernel and the 535480Snate@binkert.org * System Console Backdoor. 542SN/A * 552SN/A * The system console is a small standalone program that is initially 562SN/A * run when the system boots. It contains the necessary code to 572SN/A * access the boot disk, to read/write from the console, and to pass 582SN/A * boot parameters to the kernel. 592SN/A * 602SN/A * This version of the system console is very different from the one 612SN/A * that would be found in a real system. Many of the functions use 622SN/A * some sort of backdoor to get their job done. For example, reading 632SN/A * from the boot device on a real system would require a minimal 642SN/A * device driver to access the disk controller, but since we have a 652SN/A * simulator here, we are able to bypass the disk controller and 662SN/A * access the disk image directly. There are also some things like 672SN/A * reading the kernel off the disk image into memory that are normally 682SN/A * taken care of by the console that are now taken care of by the 692SN/A * simulator. 702SN/A * 712SN/A * These shortcuts are acceptable since the system console is 722SN/A * primarily used doing boot before the kernel has loaded its device 732SN/A * drivers. 742SN/A */ 755480Snate@binkert.orgclass AlphaBackdoor : public BasicPioDevice 762SN/A{ 772SN/A protected: 781804SN/A struct Access : public AlphaAccess 791804SN/A { 801804SN/A void serialize(std::ostream &os); 811804SN/A void unserialize(Checkpoint *cp, const std::string §ion); 821804SN/A }; 831804SN/A 84934SN/A union { 851804SN/A Access *alphaAccess; 861310SN/A uint8_t *consoleData; 87934SN/A }; 882SN/A 892SN/A /** the disk must be accessed from the console */ 902SN/A SimpleDisk *disk; 912SN/A 922SN/A /** the system console (the terminal) is accessable from the console */ 935478SN/A Terminal *terminal; 942SN/A 951634SN/A /** a pointer to the system we are running in */ 962158SN/A AlphaSystem *system; 971634SN/A 981634SN/A /** a pointer to the CPU boot cpu */ 991634SN/A BaseCPU *cpu; 1001634SN/A 1012512SN/A public: 1025480Snate@binkert.org typedef AlphaBackdoorParams Params; 1035480Snate@binkert.org AlphaBackdoor(const Params *p); 1044762SN/A 1054762SN/A const Params * 1064762SN/A params() const 1072512SN/A { 1084762SN/A return dynamic_cast<const Params *>(_params); 1094762SN/A } 1102SN/A 1111806SN/A virtual void startup(); 1121634SN/A 1132SN/A /** 1142SN/A * memory mapped reads and writes 1152SN/A */ 1163349SN/A virtual Tick read(PacketPtr pkt); 1173349SN/A virtual Tick write(PacketPtr pkt); 1182SN/A 1192SN/A /** 1202SN/A * standard serialization routines for checkpointing 1212SN/A */ 122217SN/A virtual void serialize(std::ostream &os); 123237SN/A virtual void unserialize(Checkpoint *cp, const std::string §ion); 1242SN/A}; 1252SN/A 1265480Snate@binkert.org#endif // __DEV_ALPHA_BACKDOOR_HH__ 127