backdoor.hh revision 843
1/* 2 * Copyright (c) 2003 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 29/* @file 30 * System Console Interface 31 */ 32 33#ifndef __ALPHA_CONSOLE_HH__ 34#define __ALPHA_CONSOLE_HH__ 35 36#include "base/range.hh" 37#include "dev/alpha_access.h" 38#include "dev/io_device.hh" 39#include "sim/host.hh" 40#include "dev/tsunami_io.hh" 41#include "sim/sim_object.hh" 42 43class BaseCPU; 44class SimConsole; 45class System; 46class TlaserClock; 47class SimpleDisk; 48 49/* 50 * Memory mapped interface to the system console. This device 51 * represents a shared data region between the OS Kernel and the 52 * System Console. 53 * 54 * The system console is a small standalone program that is initially 55 * run when the system boots. It contains the necessary code to 56 * access the boot disk, to read/write from the console, and to pass 57 * boot parameters to the kernel. 58 * 59 * This version of the system console is very different from the one 60 * that would be found in a real system. Many of the functions use 61 * some sort of backdoor to get their job done. For example, reading 62 * from the boot device on a real system would require a minimal 63 * device driver to access the disk controller, but since we have a 64 * simulator here, we are able to bypass the disk controller and 65 * access the disk image directly. There are also some things like 66 * reading the kernel off the disk image into memory that are normally 67 * taken care of by the console that are now taken care of by the 68 * simulator. 69 * 70 * These shortcuts are acceptable since the system console is 71 * primarily used doing boot before the kernel has loaded its device 72 * drivers. 73 */ 74class AlphaConsole : public PioDevice 75{ 76 protected: 77 union { 78 AlphaAccess *alphaAccess; 79 uint8_t *consoleData; 80 }; 81 82 /** the disk must be accessed from the console */ 83 SimpleDisk *disk; 84 85 /** the system console (the terminal) is accessable from the console */ 86 SimConsole *console; 87 88 Addr addr; 89 static const Addr size = 0x80; // equal to sizeof(alpha_access); 90 91 public: 92 /** Standard Constructor */ 93 AlphaConsole(const std::string &name, SimConsole *cons, SimpleDisk *d, 94 System *system, BaseCPU *cpu, SimObject *clock, 95 int num_cpus, MemoryController *mmu, Addr addr, 96 HierParams *hier, Bus *bus); 97 98 /** 99 * memory mapped reads and writes 100 */ 101 virtual Fault read(MemReqPtr &req, uint8_t *data); 102 virtual Fault write(MemReqPtr &req, const uint8_t *data); 103 104 /** 105 * standard serialization routines for checkpointing 106 */ 107 virtual void serialize(std::ostream &os); 108 virtual void unserialize(Checkpoint *cp, const std::string §ion); 109 110 public: 111 Tick cacheAccess(MemReqPtr &req); 112}; 113 114#endif // __ALPHA_CONSOLE_HH__ 115