1462 lines
56 KiB
JavaScript
1462 lines
56 KiB
JavaScript
/**
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* @fileoverview Implements the PDP11 Bus component.
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* @author <a href="mailto:Jeff@pcjs.org">Jeff Parsons</a>
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* @copyright © Jeff Parsons 2012-2017
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*
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* This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
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*
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* It has been adapted from the JavaScript PDP 11/70 Emulator written by Paul Nankervis
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* (paulnank@hotmail.com) at <http://skn.noip.me/pdp11/pdp11.html>. This code may be used
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* freely provided the original authors are acknowledged in any modified source code.
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*
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* PCjs is free software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation, either version 3
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* of the License, or (at your option) any later version.
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*
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* PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
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* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCjs. If not,
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* see <http://www.gnu.org/licenses/gpl.html>.
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*
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* You are required to include the above copyright notice in every modified copy of this work
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* and to display that copyright notice when the software starts running; see COPYRIGHT in
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* <http://pcjs.org/modules/shared/lib/defines.js>.
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*
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* Some PCjs files also attempt to load external resource files, such as character-image files,
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* ROM files, and disk image files. Those external resource files are not considered part of PCjs
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* for purposes of the GNU General Public License, and the author does not claim any copyright
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* as to their contents.
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*/
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"use strict";
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if (NODE) {
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var Str = require("../../shared/es6/strlib");
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var Usr = require("../../shared/es6/usrlib");
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var Component = require("../../shared/es6/component");
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var State = require("../../shared/es6/state");
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var PDP11 = require("./defines");
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var MemoryPDP11 = require("./memory");
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var MessagesPDP11 = require("./messages");
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}
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/*
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* Data types used by scanMemory()
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*/
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/**
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* This defines the BlockInfo bit fields used by scanMemory() when it creates the aBlocks array.
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*
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* @typedef {{
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* num: BitField,
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* count: BitField,
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* btmod: BitField,
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* type: BitField
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* }}
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*/
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var BlockInfoPDP11 = Usr.defineBitFields({num:20, count:8, btmod:1, type:3});
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/**
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* BusInfoPDP11 object definition (returned by scanMemory())
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*
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* cbTotal: total bytes allocated
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* cBlocks: total Memory blocks allocated
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* aBlocks: array of allocated Memory block numbers
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*
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* @typedef {{
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* cbTotal: number,
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* cBlocks: number,
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* aBlocks: Array.<BlockInfoPDP11>
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* }}
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*/
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var BusInfoPDP11;
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class BusPDP11 extends Component {
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/**
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* BusPDP11(parmsBus, cpu, dbg)
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*
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* The BusPDP11 component manages physical memory and I/O address spaces.
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*
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* The BusPDP11 component has no UI elements, so it does not require an init() handler,
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* but it still inherits from the Component class and must be allocated like any
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* other device component. It's currently allocated by the Computer's init() handler,
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* which then calls the initBus() method of all the other components.
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*
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* For memory beyond the simple needs of the ROM and RAM components (ie, memory-mapped
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* devices), the address space must still be allocated through the BusPDP11 component via
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* addMemory(). If the component needs something more than simple read/write storage,
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* it must provide a custom controller.
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*
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* @param {Object} parmsBus
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* @param {CPUStatePDP11} cpu
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* @param {DebuggerPDP11} dbg
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*/
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constructor(parmsBus, cpu, dbg)
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{
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super("Bus", parmsBus, MessagesPDP11.BUS);
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this.cpu = cpu;
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this.dbg = dbg;
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/*
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* Supported values for nBusWidth are 16 (default), 18, and 22. This represents the maximum size
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* of the bus for the life of the machine, regardless what memory management mode the CPU has enabled.
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*/
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this.nBusWidth = +parmsBus['busWidth'] || 16;
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/*
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* Compute all BusPDP11 memory block parameters now, based on the width of the bus.
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*
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* Note that all PCjs machines divide their address space into blocks, using a block size appropriate for
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* the machine's bus width. This allows us to efficiently allocate the entire address space, by reusing blocks
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* as appropriate, and to define to different address behaviors on a block-granular level.
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*
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* For PDPjs machines, the ideal block size is 8Kb (IOPAGE_LENGTH), the size of the IOPAGE on all PDP-11 machines;
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* as a result, our IOController functions assume that all incoming offsets are within a single 8Kb block.
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*/
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this.addrTotal = 1 << this.nBusWidth;
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this.nBusMask = (this.addrTotal - 1);
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this.nBlockSize = BusPDP11.IOPAGE_LENGTH;
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this.nBlockShift = Math.log2(this.nBlockSize); // ES6 ALERT (alternatively: Math.log(this.nBlockSize) / Math.LN2)
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this.nBlockLen = this.nBlockSize >> 2;
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this.nBlockLimit = this.nBlockSize - 1;
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this.nBlockTotal = (this.addrTotal / this.nBlockSize) | 0;
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this.nBlockMask = this.nBlockTotal - 1;
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this.assert(this.nBlockMask <= BlockInfoPDP11.num.mask);
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/*
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* aIOHandlers is an array (ie, a hash) of I/O notification handlers, indexed by address, where each
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* entry contains an array:
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*
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* [0]: readByte(addr)
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* [1]: writeByte(b, addr)
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* [2]: readWord(addr)
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* [3]: writeWord(w, addr)
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*
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* Each of these 4-element arrays are similar to the memory access arrays assigned to entire Memory
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* blocks, but these handlers generally target a specific address (or handful of addresses), while
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* Memory access handlers must service the entire block; see the setAccess() function in the Memory
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* component for details.
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*
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* Finally, for debugging purposes, if an I/O address has a symbolic name and message category,
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* they will be saved here:
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*
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* [4]: symbolic name of I/O address
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* [5]: message category
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*
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* UPDATE: The Debugger wants to piggy-back on these arrays to indicate addresses for which it wants
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* notification. In those cases, the following additional element will be set:
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*
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* [6]: true to break on I/O, false to ignore I/O
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*
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* The false case is important if fIOBreakAll is set, because it allows the Debugger to selectively
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* ignore specific addresses.
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*/
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this.aIOHandlers = [];
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this.fIOBreakAll = false;
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this.nDisableFaults = 0;
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this.fFault = false;
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/*
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* Array of RESET notification handlers registered by Device components.
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*/
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this.afnReset = [];
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/*
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* Before we can add any memory blocks that declare our component as a custom memory controller,
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* we must initialize the array that the getControllerAccess() method supplies to the Memory component.
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*/
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this.afnIOPage = [
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BusPDP11.IOController.readByte,
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BusPDP11.IOController.writeByte,
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BusPDP11.IOController.readWord,
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BusPDP11.IOController.writeWord
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];
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/*
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* Define all the properties to be initialized by initMemory()
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*/
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this.aBusBlocks = this.aMemBlocks = [];
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this.iBlockIOPageBus = this.iBlockIOPageMem = 0;
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this.addrIOPage = this.nIOPageRange = this.nMemMask = 0;
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/*
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* We're ready to allocate empty Memory blocks to span the entire physical address space, including the
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* initial location of the IOPAGE.
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*/
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this.initMemory();
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this.setReady();
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}
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/**
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* initMemory()
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*
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* Allocate enough (empty) Memory blocks to span the entire physical address space.
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*
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* Note that we now maintain two parallel arrays of these Memory blocks: aBusBlocks is for use by
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* devices (or any component using the "direct" interfaces), while aMemBlocks is for use by the CPU.
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*
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* Whereas the Bus memory map is fixed at init time, the CPU's memory map will vary depending on MMU
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* settings. The CPU will call setIOPageRange() as needed to update the range of addressible memory,
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* which in turn will determine where the IOPAGE can be accessed.
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*
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* @this {BusPDP11}
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*/
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initMemory()
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{
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var block = new MemoryPDP11(this);
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block.copyBreakpoints(this.dbg);
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this.aBusBlocks = new Array(this.nBlockTotal);
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this.aMemBlocks = new Array(this.nBlockTotal);
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for (var iBlock = 0; iBlock < this.nBlockTotal; iBlock++) {
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this.aBusBlocks[iBlock] = this.aMemBlocks[iBlock] = block;
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}
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/*
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* NOTE: Don't confuse the Bus addrIOPage with the CPU's addrIOPage; ours is fixed,
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* based on the machine's Bus width, whereas the CPU's varies according to the MMU setting.
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*/
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this.addrIOPage = this.addrTotal - BusPDP11.IOPAGE_LENGTH;
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this.addMemory(this.addrIOPage, BusPDP11.IOPAGE_LENGTH, MemoryPDP11.TYPE.CONTROLLER, this);
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this.iBlockIOPageBus = (this.addrIOPage & this.nBusMask) >>> this.nBlockShift;
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this.iBlockIOPageMem = this.iBlockIOPageBus;
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this.nIOPageRange = 0;
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this.nMemMask = this.nBusMask;
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}
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/**
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* setIOPageRange(nRange)
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*
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* This function is responsible for syncing the CPU memory map (aMemBlocks) with the Bus memory map (aBusBlocks)
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* and then updating the location of the IOPAGE within the CPU's memory map. The location of the IOPAGE is always
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* fixed at the top of the Bus address space, but it moves (logically) within the CPU's address space according
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* to the CPU's current MMU settings, which nRange is a reflection of.
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*
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* @this {BusPDP11}
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* @param {number} nRange (16, 18 or 22; 0 removes the IOPAGE altogether)
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*/
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setIOPageRange(nRange)
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{
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if (nRange != this.nIOPageRange) {
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for (var iBlock = 0; iBlock < this.nBlockTotal; iBlock++) {
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this.aMemBlocks[iBlock] = this.aBusBlocks[iBlock];
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}
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this.nIOPageRange = 0;
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this.nMemMask = this.nBusMask;
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if (nRange) {
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this.nIOPageRange = nRange;
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var addr = (1 << nRange);
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this.nMemMask = (addr - 1);
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addr -= BusPDP11.IOPAGE_LENGTH;
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this.iBlockIOPageMem = (addr & this.nMemMask) >>> this.nBlockShift;
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this.aMemBlocks[this.iBlockIOPageMem] = this.aBusBlocks[this.iBlockIOPageBus];
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}
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}
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}
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/**
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* getControllerBuffer(addr)
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*
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* Our Bus component also acts as custom memory controller for the IOPAGE, so it must also provide this function.
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*
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* @this {BusPDP11}
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* @param {number} addr
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* @return {Array} containing the buffer (and the offset within that buffer that corresponds to the requested block)
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*/
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getControllerBuffer(addr)
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{
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/*
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* No buffer is required for the IOPAGE; all accesses go to registered I/O handlers or to fault().
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*/
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return [null, 0];
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}
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/**
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* getControllerAccess()
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*
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* Our Bus component also acts as custom memory controller for the IOPAGE, so it must also provide this function.
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*
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* @this {BusPDP11}
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* @return {Array.<function()>}
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*/
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getControllerAccess()
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{
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return this.afnIOPage;
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}
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/**
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* getWidth()
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*
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* @this {BusPDP11}
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* @return {number}
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*/
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getWidth()
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{
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return this.nBusWidth;
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}
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/**
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* reset()
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*
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* Call all registered reset() handlers.
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*
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* @this {BusPDP11}
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*/
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reset()
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{
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for (var i = 0; i < this.afnReset.length; i++) {
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this.afnReset[i]();
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}
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this.setIOPageRange(16);
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}
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/**
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* powerUp(data, fRepower)
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*
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* @this {BusPDP11}
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* @param {Object|null} data (always null because we supply no powerDown() handler)
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* @param {boolean} [fRepower]
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* @return {boolean} true if successful, false if failure
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*/
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powerUp(data, fRepower)
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{
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if (!fRepower) {
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if (!data) {
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this.reset();
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} else {
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if (!this.restore(data)) return false;
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}
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}
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return true;
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}
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/**
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* powerDown(fSave, fShutdown)
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*
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* @this {BusPDP11}
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* @param {boolean} [fSave]
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* @param {boolean} [fShutdown]
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* @return {Object|boolean} component state if fSave; otherwise, true if successful, false if failure
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*/
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powerDown(fSave, fShutdown)
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{
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return fSave? this.save() : true;
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}
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/**
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* save()
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*
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* @this {BusPDP11}
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* @return {Object|null}
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*/
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save()
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{
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var state = new State(this);
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state.set(0, this.saveMemory());
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return state.data();
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}
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/**
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* restore(data)
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*
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* @this {BusPDP11}
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* @param {Object} data
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* @return {boolean} true if restore successful, false if not
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*/
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restore(data)
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{
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return this.restoreMemory(data[0]);
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}
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/**
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* addMemory(addr, size, type, controller)
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*
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* Adds new Memory blocks to the specified address range. Any Memory blocks previously
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* added to that range must first be removed via removeMemory(); otherwise, you'll get
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* an allocation conflict error. This helps prevent address calculation errors, redundant
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* allocations, etc.
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*
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* We've relaxed some of the original requirements (ie, that addresses must start at a
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* block-granular address, or that sizes must be equal to exactly one or more blocks),
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* because machines with large block sizes can make it impossible to load certain ROMs at
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* their required addresses. Every allocation still allocates a whole number of blocks.
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*
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* Even so, BusPDP11 memory management does NOT provide a general-purpose heap. Most memory
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* allocations occur during machine initialization and never change. In particular, there
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* is NO support for removing partial-block allocations.
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*
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* Each Memory block keeps track of a start address (addr) and length (used), indicating
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* the used space within the block; any free space that precedes or follows that used space
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* can be allocated later, by simply extending the beginning or ending of the previously used
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* space. However, any holes that might have existed between the original allocation and an
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* extension are subsumed by the extension.
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*
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* @this {BusPDP11}
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* @param {number} addr is the starting physical address of the request
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* @param {number} size of the request, in bytes
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* @param {number} type is one of the MemoryPDP11.TYPE constants
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* @param {Object} [controller] is an optional memory controller component
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* @return {boolean} true if successful, false if not
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*/
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addMemory(addr, size, type, controller)
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{
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var addrNext = addr;
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var sizeLeft = size;
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var iBlock = addrNext >>> this.nBlockShift;
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while (sizeLeft > 0 && iBlock < this.aBusBlocks.length) {
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var block = this.aBusBlocks[iBlock];
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var addrBlock = iBlock * this.nBlockSize;
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var sizeBlock = this.nBlockSize - (addrNext - addrBlock);
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if (sizeBlock > sizeLeft) sizeBlock = sizeLeft;
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/*
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* addMemory() will now happily replace an existing block when a memory controller is specified;
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* this is a work-around to make life easier for setIOPageRange(), which otherwise would have to call
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* removeMemory() first, which would just waste time and memory allocating more (empty) blocks.
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*/
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if (!controller && block && block.size) {
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if (block.type == type /* && block.controller == controller */) {
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/*
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* Where there is already a similar block with a non-zero size, we allow the allocation only if:
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*
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* 1) addrNext + sizeLeft <= block.addr (the request precedes the used portion of the current block), or
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* 2) addrNext >= block.addr + block.used (the request follows the used portion of the current block)
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*/
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if (addrNext + sizeLeft <= block.addr) {
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block.used += (block.addr - addrNext);
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block.addr = addrNext;
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return true;
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}
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if (addrNext >= block.addr + block.used) {
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var sizeAvail = block.size - (addrNext - addrBlock);
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if (sizeAvail > sizeLeft) sizeAvail = sizeLeft;
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block.used = addrNext - block.addr + sizeAvail;
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addrNext = addrBlock + this.nBlockSize;
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sizeLeft -= sizeAvail;
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iBlock++;
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continue;
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}
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}
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return this.reportError(BusPDP11.ERROR.RANGE_INUSE, addrNext, sizeLeft);
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}
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var blockNew = new MemoryPDP11(this, addrNext, sizeBlock, this.nBlockSize, type, controller);
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blockNew.copyBreakpoints(this.dbg, block);
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this.aBusBlocks[iBlock++] = blockNew;
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addrNext = addrBlock + this.nBlockSize;
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sizeLeft -= sizeBlock;
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}
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if (sizeLeft <= 0) {
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this.status("Added " + (size >> 10) + "Kb " + MemoryPDP11.TYPE_NAMES[type] + " at " + Str.toOct(addr));
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return true;
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}
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return this.reportError(BusPDP11.ERROR.RANGE_INVALID, addr, size);
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}
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/**
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* cleanMemory(addr, size)
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*
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* @this {BusPDP11}
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* @param {number} addr
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* @param {number} size
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* @return {boolean} true if all blocks were clean, false if dirty; all blocks are cleaned in the process
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*/
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cleanMemory(addr, size)
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{
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var fClean = true;
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var iBlock = addr >>> this.nBlockShift;
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while (size > 0 && iBlock < this.aBusBlocks.length) {
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if (this.aBusBlocks[iBlock].fDirty) {
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this.aBusBlocks[iBlock].fDirty = fClean = false;
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this.aBusBlocks[iBlock].fDirtyEver = true;
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}
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size -= this.nBlockSize;
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iBlock++;
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}
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return fClean;
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}
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/**
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* zeroMemory(addr, size, pattern)
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*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr
|
|
* @param {number} size
|
|
* @param {number} [pattern]
|
|
*/
|
|
zeroMemory(addr, size, pattern)
|
|
{
|
|
var off = addr & this.nBlockLimit;
|
|
var iBlock = addr >>> this.nBlockShift;
|
|
while (size > 0 && iBlock < this.aBusBlocks.length) {
|
|
this.aBusBlocks[iBlock].zero(off, size, pattern);
|
|
size -= this.nBlockSize;
|
|
iBlock++;
|
|
off = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* scanMemory(info, addr, size)
|
|
*
|
|
* Returns a BusInfoPDP11 object for the specified address range.
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {BusInfoPDP11} [info] previous BusInfoPDP11, if any
|
|
* @param {number} [addr] starting address of range (0 if none provided)
|
|
* @param {number} [size] size of range, in bytes (up to end of address space if none provided)
|
|
* @return {BusInfoPDP11} updated info (or new info if no previous info provided)
|
|
*/
|
|
scanMemory(info, addr, size)
|
|
{
|
|
if (addr == null) addr = 0;
|
|
if (size == null) size = (this.addrTotal - addr) | 0;
|
|
if (info == null) info = {cbTotal: 0, cBlocks: 0, aBlocks: []};
|
|
|
|
var iBlock = addr >>> this.nBlockShift;
|
|
var iBlockMax = ((addr + size - 1) >>> this.nBlockShift);
|
|
|
|
info.cbTotal = 0;
|
|
info.cBlocks = 0;
|
|
while (iBlock <= iBlockMax) {
|
|
var block = this.aBusBlocks[iBlock];
|
|
info.cbTotal += block.size;
|
|
if (block.size) {
|
|
info.aBlocks.push(/** @type {BlockInfoPDP11} */ (Usr.initBitFields(BlockInfoPDP11, iBlock, 0, 0, block.type)));
|
|
info.cBlocks++
|
|
}
|
|
iBlock++;
|
|
}
|
|
return info;
|
|
}
|
|
|
|
/**
|
|
* removeMemory(addr, size)
|
|
*
|
|
* Replaces every block in the specified address range with empty Memory blocks that ignore all reads/writes.
|
|
*
|
|
* TODO: Update the removeMemory() interface to reflect the relaxed requirements of the addMemory() interface.
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr
|
|
* @param {number} size
|
|
* @return {boolean} true if successful, false if not
|
|
*/
|
|
removeMemory(addr, size)
|
|
{
|
|
if (!(addr & this.nBlockLimit) && size && !(size & this.nBlockLimit)) {
|
|
var iBlock = addr >>> this.nBlockShift;
|
|
while (size > 0) {
|
|
var blockOld = this.aBusBlocks[iBlock];
|
|
var blockNew = new MemoryPDP11(this, addr);
|
|
blockNew.copyBreakpoints(this.dbg, blockOld);
|
|
this.aBusBlocks[iBlock++] = blockNew;
|
|
addr = iBlock * this.nBlockSize;
|
|
size -= this.nBlockSize;
|
|
}
|
|
return true;
|
|
}
|
|
return this.reportError(BusPDP11.ERROR.RANGE_INVALID, addr, size);
|
|
}
|
|
|
|
/**
|
|
* getMemoryBlocks(addr, size)
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr is the starting physical address
|
|
* @param {number} size of the request, in bytes
|
|
* @return {Array} of Memory blocks
|
|
*/
|
|
getMemoryBlocks(addr, size)
|
|
{
|
|
var aBlocks = [];
|
|
var iBlock = addr >>> this.nBlockShift;
|
|
while (size > 0 && iBlock < this.aBusBlocks.length) {
|
|
aBlocks.push(this.aBusBlocks[iBlock++]);
|
|
size -= this.nBlockSize;
|
|
}
|
|
return aBlocks;
|
|
}
|
|
|
|
/**
|
|
* setMemoryAccess(addr, size, afn, fQuiet)
|
|
*
|
|
* Updates the access functions in every block of the specified address range. Since the only components
|
|
* that should be dynamically modifying the memory access functions are those that use addMemory() with a custom
|
|
* memory controller, we require that the block(s) being updated do in fact have a controller.
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr
|
|
* @param {number} size
|
|
* @param {Array.<function()>} [afn]
|
|
* @param {boolean} [fQuiet] (true if any error should be quietly logged)
|
|
* @return {boolean} true if successful, false if not
|
|
*/
|
|
setMemoryAccess(addr, size, afn, fQuiet)
|
|
{
|
|
if (!(addr & this.nBlockLimit) && size && !(size & this.nBlockLimit)) {
|
|
var iBlock = addr >>> this.nBlockShift;
|
|
while (size > 0) {
|
|
var block = this.aBusBlocks[iBlock];
|
|
if (!block.controller) {
|
|
return this.reportError(BusPDP11.ERROR.NO_CONTROLLER, addr, size, fQuiet);
|
|
}
|
|
block.setAccess(afn, true);
|
|
size -= this.nBlockSize;
|
|
iBlock++;
|
|
}
|
|
return true;
|
|
}
|
|
return this.reportError(BusPDP11.ERROR.RANGE_INVALID, addr, size);
|
|
}
|
|
|
|
/**
|
|
* setMemoryBlocks(addr, size, aBlocks, type)
|
|
*
|
|
* If no type is specified, then specified address range uses all the provided blocks as-is;
|
|
* this form of setMemoryBlocks() is used for complete physical aliases.
|
|
*
|
|
* Otherwise, new blocks are allocated with the specified type; the underlying memory from the
|
|
* provided blocks is still used, but the new blocks may have different access to that memory.
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr is the starting physical address
|
|
* @param {number} size of the request, in bytes
|
|
* @param {Array} aBlocks as returned by getMemoryBlocks()
|
|
* @param {number} [type] is one of the MemoryPDP11.TYPE constants
|
|
*/
|
|
setMemoryBlocks(addr, size, aBlocks, type)
|
|
{
|
|
var i = 0;
|
|
var iBlock = addr >>> this.nBlockShift;
|
|
while (size > 0 && iBlock < this.aBusBlocks.length) {
|
|
var block = aBlocks[i++];
|
|
this.assert(block);
|
|
if (!block) break;
|
|
if (type !== undefined) {
|
|
var blockNew = new MemoryPDP11(this, addr);
|
|
blockNew.clone(block, type, this.dbg);
|
|
block = blockNew;
|
|
}
|
|
this.aBusBlocks[iBlock++] = block;
|
|
size -= this.nBlockSize;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* getByte(addr)
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr is a physical address
|
|
* @return {number} byte (8-bit) value at that address
|
|
*/
|
|
getByte(addr)
|
|
{
|
|
return this.aMemBlocks[(addr & this.nMemMask) >>> this.nBlockShift].readByte(addr & this.nBlockLimit, addr);
|
|
}
|
|
|
|
/**
|
|
* getWord(addr)
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr is a physical address
|
|
* @return {number} word (16-bit) value at that address
|
|
*/
|
|
getWord(addr)
|
|
{
|
|
var off = addr & this.nBlockLimit;
|
|
var iBlock = (addr & this.nMemMask) >>> this.nBlockShift;
|
|
if (!PDP11.WORDBUS && off == this.nBlockLimit) {
|
|
return this.aMemBlocks[iBlock++].readByte(off, addr) | (this.aMemBlocks[iBlock & this.nBlockMask].readByte(0, addr + 1) << 8);
|
|
}
|
|
return this.aMemBlocks[iBlock].readWord(off, addr);
|
|
}
|
|
|
|
/**
|
|
* setByte(addr, b)
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr is a physical address
|
|
* @param {number} b is the byte (8-bit) value to write
|
|
*/
|
|
setByte(addr, b)
|
|
{
|
|
this.assert(!(b & ~0xff));
|
|
this.aMemBlocks[(addr & this.nMemMask) >>> this.nBlockShift].writeByte(addr & this.nBlockLimit, b, addr);
|
|
}
|
|
|
|
/**
|
|
* setWord(addr, w)
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr is a physical address
|
|
* @param {number} w is the word (16-bit) value to write
|
|
*/
|
|
setWord(addr, w)
|
|
{
|
|
var off = addr & this.nBlockLimit;
|
|
var iBlock = (addr & this.nMemMask) >>> this.nBlockShift;
|
|
if (!PDP11.WORDBUS && off == this.nBlockLimit) {
|
|
this.aMemBlocks[iBlock++].writeByte(off, w & 0xff, addr);
|
|
this.aMemBlocks[iBlock & this.nBlockMask].writeByte(0, (w >> 8) & 0xff, addr + 1);
|
|
return;
|
|
}
|
|
this.aMemBlocks[iBlock].writeWord(off, w, addr);
|
|
}
|
|
|
|
/**
|
|
* getBlockDirect(addr)
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr is a physical address
|
|
* @return {MemoryPDP11}
|
|
*/
|
|
getBlockDirect(addr)
|
|
{
|
|
return this.aBusBlocks[(addr & this.nBusMask) >>> this.nBlockShift];
|
|
}
|
|
|
|
/**
|
|
* getByteDirect(addr)
|
|
*
|
|
* This is used for device I/O and Debugger physical memory requests, not the CPU.
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr is a physical address
|
|
* @return {number} byte (8-bit) value at that address
|
|
*/
|
|
getByteDirect(addr)
|
|
{
|
|
this.fFault = false;
|
|
this.nDisableFaults++;
|
|
var b = this.getBlockDirect(addr).readByteDirect(addr & this.nBlockLimit, addr);
|
|
this.nDisableFaults--;
|
|
return b;
|
|
}
|
|
|
|
/**
|
|
* getWordDirect(addr)
|
|
*
|
|
* This is used for device I/O and Debugger physical memory requests, not the CPU.
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr is a physical address
|
|
* @return {number} word (16-bit) value at that address
|
|
*/
|
|
getWordDirect(addr)
|
|
{
|
|
var w;
|
|
this.fFault = false;
|
|
this.nDisableFaults++;
|
|
var off = addr & this.nBlockLimit;
|
|
var block = this.getBlockDirect(addr);
|
|
if (!PDP11.WORDBUS && off == this.nBlockLimit) {
|
|
w = block.readByteDirect(off, addr) | (this.getBlockDirect(addr + 1).readByteDirect(0, addr + 1) << 8);
|
|
} else {
|
|
w = block.readWordDirect(off, addr);
|
|
}
|
|
this.nDisableFaults--;
|
|
return w;
|
|
}
|
|
|
|
/**
|
|
* setByteDirect(addr, b)
|
|
*
|
|
* This is used for device I/O and Debugger physical memory requests, not the CPU.
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr is a physical address
|
|
* @param {number} b is the byte (8-bit) value to write (we truncate it to 8 bits to be safe)
|
|
*/
|
|
setByteDirect(addr, b)
|
|
{
|
|
this.fFault = false;
|
|
this.nDisableFaults++;
|
|
this.getBlockDirect(addr).writeByteDirect(addr & this.nBlockLimit, b & 0xff, addr);
|
|
this.nDisableFaults--;
|
|
}
|
|
|
|
/**
|
|
* setWordDirect(addr, w)
|
|
*
|
|
* This is used for device I/O and Debugger physical memory requests, not the CPU.
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr is a physical address
|
|
* @param {number} w is the word (16-bit) value to write (we truncate it to 16 bits to be safe)
|
|
*/
|
|
setWordDirect(addr, w)
|
|
{
|
|
this.fFault = false;
|
|
this.nDisableFaults++;
|
|
var off = addr & this.nBlockLimit;
|
|
var block = this.getBlockDirect(addr);
|
|
if (!PDP11.WORDBUS && off == this.nBlockLimit) {
|
|
block.writeByteDirect(off, w & 0xff, addr);
|
|
this.getBlockDirect(addr + 1).writeByteDirect(0, (w >> 8) & 0xff, addr + 1);
|
|
} else {
|
|
block.writeWordDirect(off, w & 0xffff, addr);
|
|
}
|
|
this.nDisableFaults--;
|
|
}
|
|
|
|
/**
|
|
* addMemBreak(addr, fWrite)
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr
|
|
* @param {boolean} fWrite is true for a memory write breakpoint, false for a memory read breakpoint
|
|
*/
|
|
addMemBreak(addr, fWrite)
|
|
{
|
|
if (DEBUGGER) {
|
|
var iBlock = addr >>> this.nBlockShift;
|
|
this.aBusBlocks[iBlock].addBreakpoint(addr & this.nBlockLimit, fWrite);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* removeMemBreak(addr, fWrite)
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr
|
|
* @param {boolean} fWrite is true for a memory write breakpoint, false for a memory read breakpoint
|
|
*/
|
|
removeMemBreak(addr, fWrite)
|
|
{
|
|
if (DEBUGGER) {
|
|
var iBlock = addr >>> this.nBlockShift;
|
|
this.aBusBlocks[iBlock].removeBreakpoint(addr & this.nBlockLimit, fWrite);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* saveMemory(fAll)
|
|
*
|
|
* The only memory blocks we save are those marked as dirty, but most likely all of RAM will have been marked dirty,
|
|
* and even if our dirty-memory flags were as smart as our dirty-sector flags (ie, were set only when a write changed
|
|
* what was already there), it's unlikely that would reduce the number of RAM blocks we must save/restore. At least
|
|
* all the ROM blocks should be clean (except in the unlikely event that the Debugger was used to modify them).
|
|
*
|
|
* All dirty blocks will be stored in a single array, as pairs of block numbers and data arrays, like so:
|
|
*
|
|
* [iBlock0, [dw0, dw1, ...], iBlock1, [dw0, dw1, ...], ...]
|
|
*
|
|
* In a normal 4Kb block, there will be 1K DWORD values in the data array. Remember that each DWORD is a signed 32-bit
|
|
* integer (because they are formed using bit-wise operator rather than floating-point math operators), so don't be
|
|
* surprised to see negative numbers in the data.
|
|
*
|
|
* The above example assumes "uncompressed" data arrays. If we choose to use "compressed" data arrays, the data arrays
|
|
* will look like:
|
|
*
|
|
* [count0, dw0, count1, dw1, ...]
|
|
*
|
|
* where each count indicates how many times the following DWORD value occurs. A data array length less than 1K indicates
|
|
* that it's compressed, since we'll only store them in compressed form if they actually shrank, and we'll use State
|
|
* helper methods compress() and decompress() to create and expand the compressed data arrays.
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {boolean} [fAll] (true to save all non-ROM memory blocks, regardless of their dirty flags)
|
|
* @return {Array} a
|
|
*/
|
|
saveMemory(fAll)
|
|
{
|
|
var i = 0;
|
|
var a = [];
|
|
|
|
for (var iBlock = 0; iBlock < this.nBlockTotal; iBlock++) {
|
|
var block = this.aBusBlocks[iBlock];
|
|
/*
|
|
* We have to check both fDirty and fDirtyEver, because we may have called cleanMemory() on some of
|
|
* the memory blocks (eg, video memory), and while cleanMemory() will clear a dirty block's fDirty flag,
|
|
* it also sets the dirty block's fDirtyEver flag, which is left set for the lifetime of the machine.
|
|
*/
|
|
if (fAll && block.type != MemoryPDP11.TYPE.ROM || block.fDirty || block.fDirtyEver) {
|
|
a[i++] = iBlock;
|
|
a[i++] = State.compress(block.save());
|
|
}
|
|
}
|
|
|
|
return a;
|
|
}
|
|
|
|
/**
|
|
* restoreMemory(a)
|
|
*
|
|
* This restores the contents of all Memory blocks; called by CPUState.restore().
|
|
*
|
|
* In theory, we ONLY have to save/restore block contents. Other block attributes,
|
|
* like the type, the memory controller (if any), and the active memory access functions,
|
|
* should already be restored, since every component (re)allocates all the memory blocks
|
|
* it was using when it's restored. And since the CPU is guaranteed to be the last
|
|
* component to be restored, all those blocks (and their attributes) should be in place now.
|
|
*
|
|
* See saveMemory() for more information on how the memory block contents are saved.
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {Array} a
|
|
* @return {boolean} true if successful, false if not
|
|
*/
|
|
restoreMemory(a)
|
|
{
|
|
var i;
|
|
for (i = 0; i < a.length - 1; i += 2) {
|
|
var iBlock = a[i];
|
|
var adw = a[i+1];
|
|
if (adw && adw.length < this.nBlockLen) {
|
|
adw = State.decompress(adw, this.nBlockLen);
|
|
}
|
|
var block = this.aBusBlocks[iBlock];
|
|
if (!block || !block.restore(adw)) {
|
|
/*
|
|
* Either the block to restore hasn't been allocated, indicating a change in the machine
|
|
* configuration since it was last saved (the most likely explanation) or there's some internal
|
|
* inconsistency (eg, the block size is wrong).
|
|
*/
|
|
Component.error("Unable to restore memory block " + iBlock);
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* getMemoryLimit(type)
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} type is one of the MemoryPDP11.TYPE constants
|
|
* @return {number} (the limiting address of the specified memory type, zero if none)
|
|
*/
|
|
getMemoryLimit(type)
|
|
{
|
|
var addr = 0;
|
|
for (var iBlock = 0; iBlock < this.aBusBlocks.length; iBlock++) {
|
|
var block = this.aBusBlocks[iBlock];
|
|
if (block.type == type) {
|
|
addr = block.addr + block.used;
|
|
}
|
|
}
|
|
return addr;
|
|
}
|
|
|
|
/**
|
|
* addIOHandlers(start, end, fnReadByte, fnWriteByte, fnReadWord, fnWriteWord, message, sName)
|
|
*
|
|
* Add I/O notification handlers to the master list (aIOHandlers). The start and end addresses are typically
|
|
* relative to the starting IOPAGE address, but they can also be absolute; we simply mask all addresses with
|
|
* IOPAGE_MASK.
|
|
*
|
|
* CAVEATS: If a conflict is reported, a partial set of handlers may still have been added. There is no mechanism
|
|
* for removing handlers, since this is considered an initialization function. And finally, when a range of addresses
|
|
* is used, each successive address is advanced by 2, so if you really want to add a handler for a "+1" (usually odd)
|
|
* address, then you must add it individually. Failure to do is not necessarily fatal, because the IOController's
|
|
* fallback behavior for an odd address is to call the byte handler for the preceding even address, but the byte
|
|
* handler must be prepared for that (the handlers installed by ROM component's addROM() function are a good example).
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} start address
|
|
* @param {number} end address
|
|
* @param {function(number)|null|undefined} fnReadByte
|
|
* @param {function(number,number)|null|undefined} fnWriteByte
|
|
* @param {function(number)|null|undefined} fnReadWord
|
|
* @param {function(number,number)|null|undefined} fnWriteWord
|
|
* @param {number} [message]
|
|
* @param {string} [sName]
|
|
* @return {boolean} (true if entire range successfully registered, false if any conflicts)
|
|
*/
|
|
addIOHandlers(start, end, fnReadByte, fnWriteByte, fnReadWord, fnWriteWord, message, sName)
|
|
{
|
|
var index = (start == end? -1 : 0);
|
|
for (var addr = start; addr <= end; addr += 2) {
|
|
var off = addr & BusPDP11.IOPAGE_MASK;
|
|
if (this.aIOHandlers[off] !== undefined) {
|
|
Component.warning("I/O address already registered: " + Str.toHexLong(addr));
|
|
return false;
|
|
}
|
|
var s = sName || "unknown";
|
|
if (s && index >= 0) s += index++;
|
|
this.aIOHandlers[off] = [fnReadByte, fnWriteByte, fnReadWord, fnWriteWord, s, message || MessagesPDP11.BUS, false];
|
|
if (MAXDEBUG) this.log("addIOHandlers(" + Str.toHexLong(addr) + ")");
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* addIOTable(component, table, offReg)
|
|
*
|
|
* Add I/O notification handlers from the specified table (a batch version of addIOHandlers).
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {Component} component
|
|
* @param {Object} table
|
|
* @param {number} [offReg] (optional offset to add to all register addresses)
|
|
* @return {boolean} (true if entire range successfully registered, false if any conflicts)
|
|
*/
|
|
addIOTable(component, table, offReg)
|
|
{
|
|
for (var reg in table) {
|
|
var addr = +reg + (offReg || 0);
|
|
var afn = table[reg];
|
|
|
|
/*
|
|
* Don't install (ie, ignore) handlers for I/O addresses that are defined with a model number
|
|
* that is "greater than" than the current model.
|
|
*/
|
|
if (afn[6] && afn[6] > this.cpu.model) continue;
|
|
|
|
var fnReadByte = afn[0]? afn[0].bind(component) : null;
|
|
var fnWriteByte = afn[1]? afn[1].bind(component) : null;
|
|
var fnReadWord = afn[2]? afn[2].bind(component) : null;
|
|
var fnWriteWord = afn[3]? afn[3].bind(component) : null;
|
|
|
|
/*
|
|
* As discussed in the IOController comments below, when handlers are being registered for these
|
|
* BYTE-granular UNIBUS addresses, we must install custom fallback handlers for all BYTE accesses.
|
|
*/
|
|
if (addr >= PDP11.UNIBUS.R0SET0 && addr <= PDP11.UNIBUS.R6USER) {
|
|
if (!fnReadByte && fnReadWord) {
|
|
fnReadByte = function readByteIORegister(readWord) {
|
|
return function(addr) {
|
|
return readWord(addr) & 0xff;
|
|
}.bind(component);
|
|
}(fnReadWord);
|
|
}
|
|
if (!fnWriteByte && fnWriteWord) {
|
|
fnWriteByte = function writeByteIORegister(writeWord) {
|
|
return function(data, addr) {
|
|
return writeWord(data, addr);
|
|
}.bind(component);
|
|
}(fnWriteWord);
|
|
}
|
|
}
|
|
|
|
var sReg = afn[4];
|
|
var nRegs = afn[5] || 1;
|
|
|
|
for (var iReg = 0; iReg < nRegs; iReg++, addr += 2) {
|
|
if (sReg && nRegs > 1) sReg = afn[4] + iReg;
|
|
if (!this.addIOHandlers(addr, addr, fnReadByte, fnWriteByte, fnReadWord, fnWriteWord, afn[7] || component.bitsMessage, sReg || component.idComponent)) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* getAddrInfo(addr)
|
|
*
|
|
* Determine if the physical address is a known IOPAGE address, and return information about it (ie, the name).
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr (physical)
|
|
* @return {string|null}
|
|
*/
|
|
getAddrInfo(addr)
|
|
{
|
|
var sName = null;
|
|
if (addr >= this.addrIOPage) {
|
|
var off = addr & BusPDP11.IOPAGE_MASK;
|
|
var afn = this.aIOHandlers[off];
|
|
if (afn) sName = afn[BusPDP11.IOHANDLER.REG_NAME];
|
|
}
|
|
return sName;
|
|
}
|
|
|
|
/**
|
|
* getAddrByName(sName)
|
|
*
|
|
* Determine if the specified name has a corresponding physical address.
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {string} sName
|
|
* @return {number|null}
|
|
*/
|
|
getAddrByName(sName)
|
|
{
|
|
sName = sName.toUpperCase();
|
|
for (var i in this.aIOHandlers) {
|
|
var off = +i;
|
|
var afn = this.aIOHandlers[off];
|
|
if (afn[BusPDP11.IOHANDLER.REG_NAME] == sName) {
|
|
return this.addrIOPage + off;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* addResetHandler(fnReset)
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {function()} fnReset
|
|
*/
|
|
addResetHandler(fnReset)
|
|
{
|
|
this.afnReset.push(fnReset);
|
|
}
|
|
|
|
/**
|
|
* fault(addr, err, access)
|
|
*
|
|
* Bus interface for signaling alignment errors, invalid memory, etc.
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} addr
|
|
* @param {number} [err]
|
|
* @param {number} [access] (for diagnostic purposes only)
|
|
*/
|
|
fault(addr, err, access)
|
|
{
|
|
this.fFault = true;
|
|
if (!this.nDisableFaults) {
|
|
if (DEBUGGER && this.dbg && this.dbg.messageEnabled(MessagesPDP11.FAULT)) {
|
|
this.dbg.printMessage("memory fault (" + access + ") on " + this.dbg.toStrBase(addr), true, true);
|
|
}
|
|
if (err) this.cpu.regErr |= err;
|
|
this.cpu.trap(PDP11.TRAP.BUS, 0, addr);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* checkFault()
|
|
*
|
|
* This also serves as a clearFault() function.
|
|
*
|
|
* @this {BusPDP11}
|
|
* @return {boolean}
|
|
*/
|
|
checkFault()
|
|
{
|
|
var f = this.fFault;
|
|
this.fFault = false;
|
|
return f;
|
|
}
|
|
|
|
/**
|
|
* reportError(errNum, addr, size, fQuiet)
|
|
*
|
|
* @this {BusPDP11}
|
|
* @param {number} errNum
|
|
* @param {number} addr
|
|
* @param {number} size
|
|
* @param {boolean} [fQuiet] (true if any error should be quietly logged)
|
|
* @return {boolean} false
|
|
*/
|
|
reportError(errNum, addr, size, fQuiet)
|
|
{
|
|
var sError = "Memory block error (" + errNum + ": " + Str.toHex(addr) + "," + Str.toHex(size) + ")";
|
|
if (fQuiet) {
|
|
if (this.dbg) {
|
|
this.dbg.message(sError);
|
|
} else {
|
|
this.log(sError);
|
|
}
|
|
} else {
|
|
Component.error(sError);
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
|
|
BusPDP11.IOPAGE_16BIT = 0x00E000; /*000160000*/ // eg, PDP-11/20
|
|
BusPDP11.IOPAGE_18BIT = 0x03E000; /*000760000*/ // eg, PDP-11/45
|
|
BusPDP11.IOPAGE_22BIT = 0x3FE000; /*017760000*/ // eg, PDP-11/70
|
|
BusPDP11.IOPAGE_LENGTH = 0x002000; // ie, 8Kb
|
|
BusPDP11.IOPAGE_MASK = BusPDP11.IOPAGE_LENGTH - 1;
|
|
|
|
BusPDP11.MASK_18BIT = 0x03FFFF; /*000777777*/
|
|
|
|
BusPDP11.UNIBUS_22BIT = 0x3C0000; /*017000000*/
|
|
BusPDP11.MASK_22BIT = 0x3FFFFF; /*017777777*/
|
|
|
|
BusPDP11.ERROR = {
|
|
RANGE_INUSE: 1,
|
|
RANGE_INVALID: 2,
|
|
NO_CONTROLLER: 3
|
|
};
|
|
|
|
/*
|
|
* Every entry in the aIOHandlers table is an array with the following indexes:
|
|
*/
|
|
BusPDP11.IOHANDLER = {
|
|
READ_BYTE: 0,
|
|
WRITE_BYTE: 1,
|
|
READ_WORD: 2,
|
|
WRITE_WORD: 3,
|
|
REG_NAME: 4,
|
|
MSG_CATEGORY: 5,
|
|
DBG_BREAK: 6
|
|
};
|
|
|
|
/*
|
|
* These are our custom IOController functions for all IOPAGE accesses. They look up the IOPAGE
|
|
* offset in the aIOHandlers table, and if an entry exists, they use the appropriate IOHANDLER indexes
|
|
* (above) to locate the registered read/write handlers. If no handler is found, then fault() will
|
|
* be called, triggering a trap -- unless traps are disabled because direct access was requested
|
|
* (eg, by the Debugger).
|
|
*
|
|
* Handlers receive the original IOPAGE address that was used, although in most cases, it's ignored,
|
|
* because most handlers usually handle only one address. Only handlers used for a range of addresses
|
|
* must pay attention to it.
|
|
*
|
|
* Note that these functions include fallbacks for byte reads when only word read handlers exist (by
|
|
* masking or shifting the result) and for word reads if only byte handlers exist (by combining bytes).
|
|
* Fallbacks for writes exist, too, but they are slightly more complicated, because a byte write using
|
|
* a word write handler requires reading the word first, and then updating the appropriate byte within
|
|
* that word.
|
|
*
|
|
* Those fallbacks may not always be appropriate; for example, byte writes to some device registers
|
|
* must be zero-extended to update the entire word. For those cases, the fallback's "preliminary" read
|
|
* is issued with a fPreWrite flag so that the handler can distinguish a normal read from one of these
|
|
* preliminary reads (aka read-before-write), and return an appropriate value for the update (eg, zero).
|
|
*
|
|
* If none of these fallback behaviors are appropriate, the device has a simple recourse: register
|
|
* handlers for all possible addresses and sizes.
|
|
*
|
|
* Unlike regular Memory blocks, IOPAGE accesses permit word accesses on ODD addresses; that works
|
|
* just fine by registering WORD handlers for the appropriate ODD addresses. For BYTE accesses, it
|
|
* depends. For CPU register addresses, addIOHandlers() installs special byte handlers that perform
|
|
* either a simple word read or write. Other addresses must be handled on a case-by-case basis.
|
|
*
|
|
* TODO: Another small potential improvement would be for addIOHandlers() to install fallbacks for ALL
|
|
* missing handlers, in both the ODD and EVEN cases, so there's never a need to check each function index
|
|
* before calling it. However, since there's no avoiding checking aIOHandlers[off] (unless we FULLY populate
|
|
* the aIOHandlers array), and since these I/O accesses should be pretty infrequent relative to all other
|
|
* memory accesses, the benefit seems pretty minimal. Plus, all our fallback assumptions still need to be
|
|
* verified, so let's wait until that's done before we start optimizing this code.
|
|
*/
|
|
BusPDP11.IOController = {
|
|
/**
|
|
* readByte(off, addr)
|
|
*
|
|
* @this {MemoryPDP11}
|
|
* @param {number} off
|
|
* @param {number} addr
|
|
* @return {number}
|
|
*/
|
|
readByte: function(off, addr)
|
|
{
|
|
var b = -1;
|
|
var bus = this.controller;
|
|
var afn = bus.aIOHandlers[off];
|
|
|
|
/*
|
|
* Since addr is primarily used to advise an I/O handler of the target IOPAGE address, and since we don't want
|
|
* our handlers to worry about the current IOPAGE location, we truncate addr to 16 bits (the IOPAGE's lowest location).
|
|
*/
|
|
var addrMasked = addr & 0xffff;
|
|
|
|
if (afn) {
|
|
if (afn[BusPDP11.IOHANDLER.READ_BYTE]) {
|
|
b = afn[BusPDP11.IOHANDLER.READ_BYTE](addrMasked);
|
|
} else if (afn[BusPDP11.IOHANDLER.READ_WORD]) {
|
|
if (!(addrMasked & 0x1)) {
|
|
b = afn[BusPDP11.IOHANDLER.READ_WORD](addrMasked) & 0xff;
|
|
} else {
|
|
b = afn[BusPDP11.IOHANDLER.READ_WORD](addrMasked & ~0x1) >> 8;
|
|
}
|
|
}
|
|
} else if (addrMasked & 0x1) {
|
|
afn = bus.aIOHandlers[off & ~0x1];
|
|
if (afn) {
|
|
if (afn[BusPDP11.IOHANDLER.READ_WORD]) {
|
|
b = afn[BusPDP11.IOHANDLER.READ_WORD](addrMasked & ~0x1) >> 8;
|
|
} else if (afn[BusPDP11.IOHANDLER.READ_BYTE]) {
|
|
/*
|
|
* WARNING: This is an unusual fall-back, because we're trying to read an ODD byte
|
|
* access using a BYTE handler registered for EVEN bytes. But if that's all we've got,
|
|
* then presumably the handler is prepared for it (certainly, readROMByte() is).
|
|
*/
|
|
b = afn[BusPDP11.IOHANDLER.READ_BYTE](addrMasked)
|
|
}
|
|
}
|
|
}
|
|
if (b >= 0) {
|
|
if (DEBUGGER && this.dbg && this.dbg.messageEnabled(MessagesPDP11.BUS | afn[BusPDP11.IOHANDLER.MSG_CATEGORY])) {
|
|
this.dbg.printMessage(afn[BusPDP11.IOHANDLER.REG_NAME] + ".readByte(" + this.dbg.toStrBase(addr) + "): " + this.dbg.toStrBase(b), true, !bus.nDisableFaults);
|
|
}
|
|
return b;
|
|
}
|
|
bus.fault(addr, PDP11.CPUERR.TIMEOUT, PDP11.ACCESS.READ_BYTE);
|
|
b = 0xff;
|
|
if (DEBUGGER && this.dbg && this.dbg.messageEnabled(MessagesPDP11.BUS)) {
|
|
this.dbg.printMessage("warning: unconverted read access to byte @" + this.dbg.toStrBase(addr) + ": " + this.dbg.toStrBase(b), true, !bus.nDisableFaults);
|
|
}
|
|
return b;
|
|
},
|
|
|
|
/**
|
|
* writeByte(off, b, addr)
|
|
*
|
|
* @this {MemoryPDP11}
|
|
* @param {number} off
|
|
* @param {number} b (which should already be pre-masked to 8 bits)
|
|
* @param {number} addr
|
|
*/
|
|
writeByte: function(off, b, addr)
|
|
{
|
|
var w;
|
|
var fWrite = false;
|
|
var bus = this.controller;
|
|
var afn = bus.aIOHandlers[off];
|
|
|
|
/*
|
|
* Since addr is primarily used to advise an I/O handler of the target IOPAGE address, and since we don't want
|
|
* our handlers to worry about the current IOPAGE location, we truncate addr to 16 bits (the IOPAGE's lowest location).
|
|
*/
|
|
var addrMasked = addr & 0xffff;
|
|
|
|
if (afn) {
|
|
/*
|
|
* If a writeByte() handler exists, call it; we're done.
|
|
*/
|
|
if (afn[BusPDP11.IOHANDLER.WRITE_BYTE]) {
|
|
afn[BusPDP11.IOHANDLER.WRITE_BYTE](b, addrMasked);
|
|
fWrite = true;
|
|
}
|
|
/*
|
|
* If a writeWord() handler exists, call the readWord() handler first to get the original data
|
|
* (with fPreWrite set to true) and call writeWord() with the new data inserted into the original data.
|
|
*/
|
|
else if (afn[BusPDP11.IOHANDLER.WRITE_WORD]) {
|
|
w = afn[BusPDP11.IOHANDLER.READ_WORD]? afn[BusPDP11.IOHANDLER.READ_WORD](addrMasked, true) : 0;
|
|
if (!(addrMasked & 0x1)) {
|
|
afn[BusPDP11.IOHANDLER.WRITE_WORD]((w & ~0xff) | b, addrMasked);
|
|
fWrite = true;
|
|
} else {
|
|
afn[BusPDP11.IOHANDLER.WRITE_WORD]((w & 0xff) | (b << 8), addrMasked & ~0x1);
|
|
fWrite = true;
|
|
}
|
|
}
|
|
} else if (addrMasked & 0x1) {
|
|
/*
|
|
* If no handler existed, and this address was odd, then perhaps a handler exists for the even address;
|
|
* if so, call the readWord() handler first to get the original data (with fPreWrite set to true) and call
|
|
* writeWord() with the new data inserted into (the high byte of) the original data.
|
|
*/
|
|
afn = bus.aIOHandlers[off & ~0x1];
|
|
if (afn) {
|
|
if (afn[BusPDP11.IOHANDLER.WRITE_WORD]) {
|
|
addrMasked &= ~0x1;
|
|
w = afn[BusPDP11.IOHANDLER.READ_WORD]? afn[BusPDP11.IOHANDLER.READ_WORD](addrMasked, true) : 0;
|
|
afn[BusPDP11.IOHANDLER.WRITE_WORD]((w & 0xff) | (b << 8), addrMasked);
|
|
fWrite = true;
|
|
} else if (afn[BusPDP11.IOHANDLER.WRITE_BYTE]) {
|
|
/*
|
|
* WARNING: This is an unusual fall-back, because we're trying to write an ODD byte
|
|
* access using a BYTE handler registered for EVEN bytes. But if that's all we've got,
|
|
* then presumably the handler is prepared for it (certainly, writeROMByte() is).
|
|
*/
|
|
afn[BusPDP11.IOHANDLER.WRITE_BYTE](b, addrMasked);
|
|
fWrite = true;
|
|
}
|
|
}
|
|
}
|
|
if (fWrite) {
|
|
if (DEBUGGER && this.dbg && this.dbg.messageEnabled(MessagesPDP11.BUS | afn[BusPDP11.IOHANDLER.MSG_CATEGORY])) {
|
|
this.dbg.printMessage(afn[BusPDP11.IOHANDLER.REG_NAME] + ".writeByte(" + this.dbg.toStrBase(addr) + "," + this.dbg.toStrBase(b) + ")", true, !bus.nDisableFaults);
|
|
}
|
|
return;
|
|
}
|
|
bus.fault(addr, PDP11.CPUERR.TIMEOUT, PDP11.ACCESS.WRITE_BYTE);
|
|
if (DEBUGGER && this.dbg && this.dbg.messageEnabled(MessagesPDP11.BUS)) {
|
|
this.dbg.printMessage("warning: unconverted write access to byte @" + this.dbg.toStrBase(addr) + ": " + this.dbg.toStrBase(b), true, !bus.nDisableFaults);
|
|
}
|
|
},
|
|
|
|
/**
|
|
* readWord(off, addr)
|
|
*
|
|
* @this {MemoryPDP11}
|
|
* @param {number} off
|
|
* @param {number} addr
|
|
* @return {number}
|
|
*/
|
|
readWord: function(off, addr)
|
|
{
|
|
var w = -1;
|
|
var bus = this.controller;
|
|
var afn = bus.aIOHandlers[off];
|
|
|
|
/*
|
|
* Since addr is primarily used to advise an I/O handler of the target IOPAGE address, and since we don't want
|
|
* our handlers to worry about the current IOPAGE location, we truncate addr to 16 bits (the IOPAGE's lowest location).
|
|
*/
|
|
var addrMasked = addr & 0xffff;
|
|
|
|
if (afn) {
|
|
if (afn[BusPDP11.IOHANDLER.READ_WORD]) {
|
|
w = afn[BusPDP11.IOHANDLER.READ_WORD](addrMasked);
|
|
} else if (afn[BusPDP11.IOHANDLER.READ_BYTE]) {
|
|
w = afn[BusPDP11.IOHANDLER.READ_BYTE](addrMasked) | (afn[BusPDP11.IOHANDLER.READ_BYTE](addrMasked + 1) << 8);
|
|
}
|
|
}
|
|
if (w >= 0) {
|
|
if (DEBUGGER && this.dbg && this.dbg.messageEnabled(MessagesPDP11.BUS | afn[BusPDP11.IOHANDLER.MSG_CATEGORY])) {
|
|
this.dbg.printMessage(afn[BusPDP11.IOHANDLER.REG_NAME] + ".readWord(" + this.dbg.toStrBase(addr) + "): " + this.dbg.toStrBase(w), true, !bus.nDisableFaults);
|
|
}
|
|
return w;
|
|
}
|
|
bus.fault(addr, PDP11.CPUERR.TIMEOUT, PDP11.ACCESS.READ_WORD);
|
|
w = 0xffff;
|
|
if (DEBUGGER && this.dbg && this.dbg.messageEnabled(MessagesPDP11.BUS)) {
|
|
this.dbg.printMessage("warning: unconverted read access to word @" + this.dbg.toStrBase(addr) + ": " + this.dbg.toStrBase(w), true, !bus.nDisableFaults);
|
|
}
|
|
return w;
|
|
},
|
|
|
|
/**
|
|
* writeWord(off, w, addr)
|
|
*
|
|
* @this {MemoryPDP11}
|
|
* @param {number} off
|
|
* @param {number} w (which should already be pre-masked to 16 bits)
|
|
* @param {number} addr
|
|
*/
|
|
writeWord: function(off, w, addr)
|
|
{
|
|
var fWrite = false;
|
|
var bus = this.controller;
|
|
var afn = bus.aIOHandlers[off];
|
|
|
|
/*
|
|
* Since addr is primarily used to advise an I/O handler of the target IOPAGE address, and since we don't want
|
|
* our handlers to worry about the current IOPAGE location, we truncate addr to 16 bits (the IOPAGE's lowest location).
|
|
*/
|
|
var addrMasked = addr & 0xffff;
|
|
|
|
if (afn) {
|
|
if (afn[BusPDP11.IOHANDLER.WRITE_WORD]) {
|
|
afn[BusPDP11.IOHANDLER.WRITE_WORD](w, addrMasked);
|
|
fWrite = true;
|
|
} else if (afn[BusPDP11.IOHANDLER.WRITE_BYTE]) {
|
|
afn[BusPDP11.IOHANDLER.WRITE_BYTE](w & 0xff, addrMasked);
|
|
afn[BusPDP11.IOHANDLER.WRITE_BYTE](w >> 8, addrMasked + 1);
|
|
fWrite = true;
|
|
}
|
|
}
|
|
if (fWrite) {
|
|
if (DEBUGGER && this.dbg && this.dbg.messageEnabled(MessagesPDP11.BUS | afn[BusPDP11.IOHANDLER.MSG_CATEGORY])) {
|
|
this.dbg.printMessage(afn[BusPDP11.IOHANDLER.REG_NAME] + ".writeWord(" + this.dbg.toStrBase(addr) + "," + this.dbg.toStrBase(w) + ")", true, !bus.nDisableFaults);
|
|
}
|
|
return;
|
|
}
|
|
bus.fault(addr, PDP11.CPUERR.TIMEOUT, PDP11.ACCESS.WRITE_WORD);
|
|
if (DEBUGGER && this.dbg && this.dbg.messageEnabled(MessagesPDP11.BUS)) {
|
|
this.dbg.printMessage("warning: unconverted write access to word @" + this.dbg.toStrBase(addr) + ": " + this.dbg.toStrBase(w), true, !bus.nDisableFaults);
|
|
}
|
|
}
|
|
};
|
|
|
|
if (NODE) module.exports = BusPDP11;
|