773 lines
28 KiB
JavaScript
773 lines
28 KiB
JavaScript
/**
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* @fileoverview Implements the PCjs Bus component.
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* @author <a href="mailto:Jeff@pcjs.org">Jeff Parsons</a>
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* @version 1.0
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* @suppress {missingProperties}
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* Created 2012-Sep-04
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*
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* Copyright © 2012-2014 Jeff Parsons <Jeff@pcjs.org>
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*
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* This file is part of PCjs, which is part of the JavaScript Machines Project (aka JSMachines)
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* at <http://jsmachines.net/> and <http://pcjs.org/>.
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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 source code file of every
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* copy or modified version of this work, and to display that copyright notice on every screen
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* that loads or runs any version of this software (see Computer.sCopyright).
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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 the
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* PCjs program for purposes of the GNU General Public License, and the author does not claim
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* any copyright as to their contents.
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*/
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"use strict";
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if (typeof module !== 'undefined') {
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var str = require("../../shared/lib/strlib");
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var Component = require("../../shared/lib/component");
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var Memory = require("./mem");
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var State = require("./state");
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}
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/**
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* Bus(cpu, dbg)
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*
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* The Bus component manages "physical" memory and I/O address spaces.
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*
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* The Bus 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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* When initMemory() initializes the entire address space, it also passes aMemBlocks
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* to the CPU object, so that the CPU can perform all its own address-to-block and memory
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* block accesses directly.
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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 Bus 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 controller with getMemoryBuffer() and getMemoryAccess() methods.
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*
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* By contrast, all port access operations are defined by external handlers; they
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* register with us, and we manage those registrations, and we'll probably provide I/O
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* breakpoints at some point, but unlike memory accesses, we're not involved with I/O
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* accesses at all.
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*
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* @constructor
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* @extends Component
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* @param {Object} parmsBus
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* @param {X86CPU|Component} cpu
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* @param {Debugger|Component} dbg
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*/
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function Bus(parmsBus, cpu, dbg)
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{
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Component.call(this, "Bus", parmsBus, Bus);
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this.cpu = cpu;
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this.dbg = dbg;
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this.nBusWidth = parmsBus['buswidth'] || 20;
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/*
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* Compute all the Bus memory block addressing values that we rely on, based on the width of the bus.
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*
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* Regarding this.blockTotal, we want to avoid address-overflow-detection expressions like:
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*
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* iBlock < this.blockTotal? iBlock : 0
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*
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* and as long as we know that this.blockTotal is a power-of-two (eg, 256 or 0x100, in the case
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* of nBusWidth == 20), we can define this.blockMask as (this.blockTotal - 1) and rewrite the previous
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* expression as:
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*
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* iBlock & this.blockMask
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*
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* While we *could* say that we mask addresses with this.addrLimit to simulate "A20 wrap", the simple
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* fact is it relieves us from bounds-checking every aMemBlocks index. Address wrapping at the 1Mb
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* boundary (ie, the A20 address line) is something we'll have to deal with more carefully on the 80286.
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*
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* New property Old property Old hard-coded values (when nBusWidth was always 20)
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* ------------ ------------ ----------------------------------------------------
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* this.addrLimit Bus.ADDR.LIMIT 0xfffff
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* this.addrMask N/A N/A
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* this.blockSize Bus.BLOCK.SIZE 4096
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* this.blockLen Bus.BLOCK.LEN (this.blockSize >> 2)
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* this.blockShift Bus.BLOCK.SHIFT 12
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* this.blockLimit Bus.BLOCK.LIMIT 0xfff
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* this.blockTotal Bus.BLOCK.TOTAL ((this.addrLimit + this.blockSize) / this.blockSize) | 0
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* this.blockMask Bus.BLOCK.MASK (this.blockTotal - 1) (ie, 0xff)
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*
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* Note that the blockShift calculation below chooses a 4Kb physical memory block size for a 20-bit bus
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* (1Mb address space) and a 16Kb physical memory block for a 24-bit bus (16Mb address space). This yields
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* a 256-block array for the smaller bus and a 1024-block array for the larger bus. If we left the block
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* size at 4Kb in all cases, we'd end up with a 4096-block array for an 80286, which seems a bit excessive.
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*
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* I can't think of any reason why a coarser block granularity (of 16Kb) should hurt anything, other than
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* wasting a little memory for ROMs smaller than the block size. Realize that this is strictly a physical
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* memory implementation detail, which should have no bearing on segment or page granularity of any future
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* virtual memory implementation.
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*/
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this.addrLimit = this.addrMask = (1 << this.nBusWidth) - 1;
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this.blockShift = (this.nBusWidth <= 20? 12 : 14);
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this.blockSize = 1 << this.blockShift;
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this.blockLen = this.blockSize >> 2;
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this.blockLimit = this.blockSize - 1;
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this.blockTotal = ((this.addrLimit + this.blockSize) / this.blockSize) | 0;
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this.blockMask = this.blockTotal - 1;
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/*
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* Lists of I/O notification functions: aPortInputNotify and aPortOutputNotify are arrays, indexed by
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* port, of sub-arrays which contain:
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*
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* [0]: registered component
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* [1]: registered function to call for every I/O access
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*
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* The registered function is called with the port address, and if the access was triggered by the CPU,
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* the physical address (EIP) that the access occurred from.
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*
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* WARNING: Unlike the (old) read and write memory notification functions, these support only one
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* pair of input/output functions per port. A more sophisticated architecture could support a list
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* of chained functions across multiple components, but I doubt that will be necessary here.
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*
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* UPDATE: The Debugger now piggy-backs on these arrays to indicate ports for which it wants notification
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* of I/O. In those cases, the registered component/function elements may or may not be set, but the following
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* additional element will be set:
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*
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* [2]: 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 fPortInputBreakAll and/or fPortOutputBreakAll is set, because it allows the
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* Debugger to selectively ignore specific ports.
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*/
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this.aPortInputNotify = [];
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this.aPortOutputNotify = [];
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this.fPortInputBreakAll = this.fPortOutputBreakAll = false;
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/*
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* Allocate empty Memory blocks to span the entire physical address space.
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*/
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this.initMemory();
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this.setReady();
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}
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Component.subclass(Component, Bus);
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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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* @this {Bus}
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*/
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Bus.prototype.initMemory = function()
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{
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this.aMemBlocks = new Array(this.blockTotal);
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for (var iBlock = 0; iBlock < this.blockTotal; iBlock++) {
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var addr = iBlock * this.blockSize;
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var block = this.aMemBlocks[iBlock] = new Memory(addr);
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if (DEBUGGER) block.setDebugInfo(this.cpu, this.dbg, addr, this.blockSize);
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}
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this.cpu.initMemory(this.aMemBlocks, this.addrLimit, this.blockShift, this.blockLimit, this.blockMask);
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this.cpu.setAddressMask(this.addrMask);
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};
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/**
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* reset()
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*
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* @this {Bus}
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*/
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Bus.prototype.reset = function()
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{
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this.setA20(true);
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};
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/**
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* addMemory(addr, size, fReadOnly, 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. Moreover, the address range must start at a block-granular
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* address and span exactly one or more blocks; otherwise, you'll get a memory range error.
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*
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* These restrictions help prevent address calculation errors, redundant allocations, etc.
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*
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* @this {Bus}
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* @param {number} addr is the starting physical address of the memory address range
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* @param {number} size of the length in bytes of the range; must be a multiple of BLOCK_SIZE
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* @param {boolean} [fReadOnly] is true if the memory must be read-only; default is read-write
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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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Bus.prototype.addMemory = function(addr, size, fReadOnly, controller)
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{
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if (!(addr & this.blockLimit) && size && !(size & this.blockLimit)) {
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var iBlock = addr >> this.blockShift;
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while (size > 0 && iBlock < this.aMemBlocks.length) {
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var block = this.aMemBlocks[iBlock];
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if (block !== undefined && block.size) {
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return this.reportError(1, addr, size);
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}
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addr = iBlock * this.blockSize;
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block = this.aMemBlocks[iBlock++] = new Memory(addr, this.blockSize, fReadOnly, controller);
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if (DEBUGGER) block.setDebugInfo(this.cpu, this.dbg, addr, this.blockSize);
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size -= this.blockSize;
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}
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return true;
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}
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return this.reportError(2, 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 {Bus}
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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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Bus.prototype.cleanMemory = function(addr, size)
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{
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var fClean = true;
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var iBlock = addr >> this.blockShift;
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while (size > 0 && iBlock < this.aMemBlocks.length) {
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if (this.aMemBlocks[iBlock].fDirty) {
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this.aMemBlocks[iBlock].fDirty = fClean = false;
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this.aMemBlocks[iBlock].fDirtyEver = true;
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}
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size -= this.blockSize;
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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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* getA20()
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*
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* @this {Bus}
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* @return {boolean} true if enabled, false if disabled
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*/
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Bus.prototype.getA20 = function()
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{
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return this.addrLimit == this.addrMask;
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};
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/**
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* setA20(fEnable)
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*
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* @this {Bus}
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* @param {boolean} fEnable is true to enable A20 (default), false to disable
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*/
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Bus.prototype.setA20 = function(fEnable)
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{
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Component.assert(fEnable !== undefined);
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if (fEnable !== undefined) {
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if (this.nBusWidth > 20) {
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var addrMask = (this.addrMask & ~0x100000) | (fEnable? 0x100000 : 0);
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if (addrMask != this.addrMask) {
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this.addrMask = addrMask;
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/*
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* This callback is required only because the CPU "insists" on using its own memory access functions.
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*/
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if (this.cpu) this.cpu.setAddressMask(addrMask);
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}
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}
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}
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};
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/**
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* setMemoryAccess(addr, size)
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*
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* Updates the access functions in every block of the specified address range. Since the only components
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* that should be dynamically modifying the memory access functions are those that use addMemory() with a custom
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* memory controller, we require that the block(s) being updated do in fact have a controller.
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*
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* @this {Bus}
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* @param {number} addr
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* @param {number} size
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* @param {Array.<function()>} [afn]
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* @return {boolean} true if successful, false if not
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*/
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Bus.prototype.setMemoryAccess = function(addr, size, afn)
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{
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if (!(addr & this.blockLimit) && size && !(size & this.blockLimit)) {
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var iBlock = addr >> this.blockShift;
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while (size > 0) {
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var block = this.aMemBlocks[iBlock];
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if (!block.controller) {
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return this.reportError(5, addr, size);
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}
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block.setAccess(afn);
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size -= this.blockSize;
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iBlock++;
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}
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return true;
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}
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return this.reportError(3, addr, size);
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};
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/**
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* removeMemory(addr, size)
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*
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* Replaces every block in the specified address range with empty Memory blocks that will ignore all reads/writes.
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*
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* @this {Bus}
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* @param {number} addr
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* @param {number} size
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* @return {boolean} true if successful, false if not
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*/
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Bus.prototype.removeMemory = function(addr, size)
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{
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if (!(addr & this.blockLimit) && size && !(size & this.blockLimit)) {
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var iBlock = addr >> this.blockShift;
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while (size > 0) {
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addr = iBlock * this.blockSize;
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var block = this.aMemBlocks[iBlock++] = new Memory(addr);
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if (DEBUGGER) block.setDebugInfo(this.cpu, this.dbg, addr, this.blockSize);
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size -= this.blockSize;
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}
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return true;
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}
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return this.reportError(4, addr, size);
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};
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/**
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* getByteDirect(addr)
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*
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* @this {Bus}
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* @param {number} addr is a physical (non-segmented) address
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* @return {number} byte (8-bit) value at that address
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*/
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Bus.prototype.getByteDirect = function(addr)
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{
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return this.aMemBlocks[(addr & this.addrMask) >> this.blockShift].readByteDirect(addr & this.blockLimit);
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};
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/**
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* getWordDirect(addr)
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*
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* @this {Bus}
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* @param {number} addr is a physical (non-segmented) address
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* @return {number} word (16-bit) value at that address
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*/
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Bus.prototype.getWordDirect = function(addr)
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{
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var off = addr & this.blockLimit;
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var iBlock = (addr & this.addrMask) >> this.blockShift;
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if (off != this.blockLimit) {
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return this.aMemBlocks[iBlock].readWordDirect(off);
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}
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return this.aMemBlocks[iBlock++].readByteDirect(off) | (this.aMemBlocks[iBlock & this.blockMask].readByteDirect(0) << 8);
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};
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/**
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* setByteDirect(addr, b)
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*
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* @this {Bus}
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* @param {number} addr is a physical (non-segmented) address
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* @param {number} b is the byte (8-bit) value to write (we truncate it to 8 bits to be safe)
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*/
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Bus.prototype.setByteDirect = function(addr, b)
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{
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this.aMemBlocks[(addr & this.addrMask) >> this.blockShift].writeByteDirect(addr & this.blockLimit, b & 0xff);
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};
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/**
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* setWordDirect(addr, w)
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*
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* @this {Bus}
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* @param {number} addr is a physical (non-segmented) address
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* @param {number} w is the word (16-bit) value to write (we truncate it to 16 bits to be safe)
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*/
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Bus.prototype.setWordDirect = function(addr, w)
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{
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var off = addr & this.blockLimit;
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var iBlock = (addr & this.addrMask) >> this.blockShift;
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if (off != this.blockLimit) {
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this.aMemBlocks[iBlock].writeWordDirect(off, w & 0xffff);
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return;
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}
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this.aMemBlocks[iBlock++].writeByteDirect(off, w & 0xff);
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this.aMemBlocks[iBlock & this.blockMask].writeByteDirect(0, (w >> 8) & 0xff);
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};
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/**
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* saveMemory()
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*
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* The only memory blocks we save are those marked as dirty; most likely all of RAM will have been marked dirty,
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* and even if our dirty-memory flags were as smart as our dirty-sector flags (ie, were set only when a write changed
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* what was already there), it's unlikely that would reduce the number of RAM blocks we must save/restore. At least
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* all the ROM blocks should be clean (except in the unlikely event that the Debugger was used to modify them).
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*
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* All dirty blocks will be stored in a single array, as pairs of block numbers and data arrays, like so:
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*
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* [iBlock0, [dw0, dw1, ...], iBlock1, [dw0, dw1, ...], ...]
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*
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* In a normal 4Kb block, there will be 1K DWORD values in the data array. Remember that each DWORD is a signed 32-bit
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* integer (because they are formed using bit-wise operator rather than floating-point math operators), so don't be
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* surprised to see negative numbers in the data.
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*
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* The above example assumes "uncompressed" data arrays. If we choose to use "compressed" data arrays, the data arrays
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* will look like:
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*
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* [count0, dw0, count1, dw1, ...]
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*
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* where each count indicates how many times the following DWORD value occurs. A data array length less than 1K indicates
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* that it's compressed, since we'll only store them in compressed form if they actually shrank, and we'll use State
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* helper methods compress() and decompress() to create and expand the compressed data arrays.
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*
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* @this {Bus}
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* @return {Array} a
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*/
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Bus.prototype.saveMemory = function()
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{
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var i = 0;
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var a = [];
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for (var iBlock = 0; iBlock < this.blockTotal; iBlock++) {
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var block = this.aMemBlocks[iBlock];
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/*
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* We have to check both fDirty and fDirtyEver, because we may have called cleanMemory() on some of
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* the memory blocks (eg, video memory), and while cleanMemory() will clear a dirty block's fDirty flag,
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* it also sets the dirty block's fDirtyEver flag, which is left set for the lifetime of the machine.
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*/
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if (block.fDirty || block.fDirtyEver) {
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a[i++] = iBlock;
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a[i++] = State.compress(block.save());
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}
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}
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a[i] = this.getA20();
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return a;
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};
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/**
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* restoreMemory(a)
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*
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* This restores the contents of all Memory blocks; called by X86CPU.restore().
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*
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* In theory, we ONLY have to save/restore block contents. Other block attributes,
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* like fReadOnly, the memory controller (if any), and the active memory access functions,
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* should already be restored, since every component (re)allocates all the memory blocks
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* it was using when it's restored. And since the CPU is guaranteed to be the last
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* component to be restored, all those blocks (and their attributes) should be in place now.
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*
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* See saveMemory() for a description of how the memory block contents are saved.
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*
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* @this {Bus}
|
|
* @param {Array} a
|
|
* @return {boolean} true if successful, false if not
|
|
*/
|
|
Bus.prototype.restoreMemory = function(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.blockLen) {
|
|
adw = State.decompress(adw, this.blockLen);
|
|
}
|
|
var block = this.aMemBlocks[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;
|
|
}
|
|
}
|
|
if (a[i] !== undefined) this.setA20(a[i]);
|
|
return true;
|
|
};
|
|
|
|
/**
|
|
* addMemoryBreakpoint(addr, fWrite)
|
|
*
|
|
* @this {Bus}
|
|
* @param {number} addr
|
|
* @param {boolean} fWrite is true for a memory write breakpoint, false for a memory read breakpoint
|
|
*/
|
|
Bus.prototype.addMemoryBreakpoint = function(addr, fWrite)
|
|
{
|
|
if (DEBUGGER) {
|
|
var iBlock = addr >> this.blockShift;
|
|
this.aMemBlocks[iBlock].addBreakpoint(addr & this.blockLimit, fWrite);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* removeMemoryBreakpoint(addr, fWrite)
|
|
*
|
|
* @this {Bus}
|
|
* @param {number} addr
|
|
* @param {boolean} fWrite is true for a memory write breakpoint, false for a memory read breakpoint
|
|
*/
|
|
Bus.prototype.removeMemoryBreakpoint = function(addr, fWrite)
|
|
{
|
|
if (DEBUGGER) {
|
|
var iBlock = addr >> this.blockShift;
|
|
this.aMemBlocks[iBlock].removeBreakpoint(addr & this.blockLimit, fWrite);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* addPortInputBreak(port)
|
|
*
|
|
* @this {Bus}
|
|
* @param {number} [port]
|
|
* @return {boolean} true if break on port input enabled, false if disabled
|
|
*/
|
|
Bus.prototype.addPortInputBreak = function(port)
|
|
{
|
|
if (port === undefined) {
|
|
this.fPortInputBreakAll = !this.fPortInputBreakAll;
|
|
return this.fPortInputBreakAll;
|
|
}
|
|
if (this.aPortInputNotify[port] === undefined) {
|
|
this.aPortInputNotify[port] = [null, null, false];
|
|
}
|
|
this.aPortInputNotify[port][2] = !this.aPortInputNotify[port][2];
|
|
return this.aPortInputNotify[port][2];
|
|
};
|
|
|
|
/**
|
|
* addPortInputNotify(start, end, component, fn)
|
|
*
|
|
* Add a port input-notification handler to the list of such handlers.
|
|
*
|
|
* @this {Bus}
|
|
* @param {number} start port address
|
|
* @param {number} end port address
|
|
* @param {Component} component
|
|
* @param {function(number,number)} fn is called with the port and EIP values at the time of the input
|
|
*/
|
|
Bus.prototype.addPortInputNotify = function(start, end, component, fn)
|
|
{
|
|
if (fn !== undefined) {
|
|
for (var port = start; port <= end; port++) {
|
|
if (this.aPortInputNotify[port] !== undefined) {
|
|
Component.warning("Input port " + str.toHexWord(port) + " registered by " + this.aPortInputNotify[port][0].id + ", ignoring " + component.id);
|
|
continue;
|
|
}
|
|
this.aPortInputNotify[port] = [component, fn, false, false];
|
|
if (MAXDEBUG) this.log("addPortInputNotify(" + str.toHexWord(port) + "," + component.id + ")");
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* addPortInputTable(component, table, offset)
|
|
*
|
|
* Add port input-notification handlers from the specified table (a batch version of addPortInputNotify)
|
|
*
|
|
* @this {Bus}
|
|
* @param {Component} component
|
|
* @param {Object} table
|
|
* @param {number} [offset] is an optional port offset
|
|
*/
|
|
Bus.prototype.addPortInputTable = function(component, table, offset)
|
|
{
|
|
if (offset === undefined) offset = 0;
|
|
for (var port in table) {
|
|
/*
|
|
* JavaScript coerces property keys to strings, so we use parseInt() to coerce them back to numbers.
|
|
*/
|
|
port = parseInt(port, 10);
|
|
this.addPortInputNotify(port + offset, port + offset, component, table[port]);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* checkPortInputNotify(port, addrFrom)
|
|
*
|
|
* @this {Bus}
|
|
* @param {number} port
|
|
* @param {number} [addrFrom] is the EIP value at the time of the input
|
|
* @return {number} simulated port value (0xff if none)
|
|
*
|
|
* NOTE: It seems that at least parts of the ROM BIOS (like the RS-232 probes around F000:E5D7 in the 5150 BIOS)
|
|
* assume that ports for non-existent hardware return 0xff rather than 0x00, hence my new default (0xff) below.
|
|
*/
|
|
Bus.prototype.checkPortInputNotify = function(port, addrFrom)
|
|
{
|
|
var bIn = 0xff;
|
|
var aNotify = this.aPortInputNotify[port];
|
|
if (aNotify !== undefined) {
|
|
if (aNotify[1]) {
|
|
bIn = aNotify[1].call(aNotify[0], port, addrFrom);
|
|
}
|
|
if (DEBUGGER && this.dbg && this.fPortInputBreakAll != aNotify[2]) {
|
|
this.dbg.checkPortInput(port, bIn);
|
|
}
|
|
}
|
|
else {
|
|
if (DEBUGGER && this.dbg) {
|
|
this.dbg.messagePort(this, port, null, addrFrom);
|
|
if (this.fPortInputBreakAll) this.dbg.checkPortInput(port, bIn);
|
|
}
|
|
}
|
|
return bIn;
|
|
};
|
|
|
|
/**
|
|
* removePortInputNotify(start, end, component, fn)
|
|
*
|
|
* Remove a port input-notification handler from the list of such handlers (to be ENABLED later if needed)
|
|
*
|
|
* @this {Bus}
|
|
* @param {number} start address
|
|
* @param {number} end address
|
|
* @param {Component} component
|
|
* @param {function(number,number)} fn of previously added handler
|
|
*
|
|
Bus.prototype.removePortInputNotify = function(start, end, component, fn)
|
|
{
|
|
for (var port = start; port < end; port++) {
|
|
if (this.aPortInputNotify[port] && this.aPortInputNotify[port][0] == component && this.aPortInputNotify[port][1] == fn) {
|
|
this.aPortInputNotify[port] = undefined;
|
|
}
|
|
}
|
|
};
|
|
*/
|
|
|
|
/**
|
|
* addPortOutputBreak(port)
|
|
*
|
|
* @this {Bus}
|
|
* @param {number} [port]
|
|
* @return {boolean} true if break on port output enabled, false if disabled
|
|
*/
|
|
Bus.prototype.addPortOutputBreak = function(port)
|
|
{
|
|
if (port === undefined) {
|
|
this.fPortOutputBreakAll = !this.fPortOutputBreakAll;
|
|
return this.fPortOutputBreakAll;
|
|
}
|
|
if (this.aPortOutputNotify[port] === undefined) {
|
|
this.aPortOutputNotify[port] = [null, null, false];
|
|
}
|
|
this.aPortOutputNotify[port][2] = !this.aPortOutputNotify[port][2];
|
|
return this.aPortOutputNotify[port][2];
|
|
};
|
|
|
|
/**
|
|
* addPortOutputNotify(start, end, component, fn)
|
|
*
|
|
* Add a port output-notification handler to the list of such handlers.
|
|
*
|
|
* @this {Bus}
|
|
* @param {number} start port address
|
|
* @param {number} end port address
|
|
* @param {Component} component
|
|
* @param {function(number,number)} fn is called with the port and EIP values at the time of the output
|
|
*/
|
|
Bus.prototype.addPortOutputNotify = function(start, end, component, fn)
|
|
{
|
|
if (fn !== undefined) {
|
|
for (var port = start; port <= end; port++) {
|
|
if (this.aPortOutputNotify[port] !== undefined) {
|
|
Component.warning("Output port " + str.toHexWord(port) + " registered by " + this.aPortOutputNotify[port][0].id + ", ignoring " + component.id);
|
|
continue;
|
|
}
|
|
this.aPortOutputNotify[port] = [component, fn, false, false];
|
|
if (MAXDEBUG) this.log("addPortOutputNotify(" + str.toHexWord(port) + "," + component.id + ")");
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* addPortOutputTable(component, table, offset)
|
|
*
|
|
* Add port output-notification handlers from the specified table (a batch version of addPortOutputNotify)
|
|
*
|
|
* @this {Bus}
|
|
* @param {Component} component
|
|
* @param {Object} table
|
|
* @param {number} [offset] is an optional port offset
|
|
*/
|
|
Bus.prototype.addPortOutputTable = function(component, table, offset)
|
|
{
|
|
if (offset === undefined) offset = 0;
|
|
for (var port in table) {
|
|
/*
|
|
* JavaScript converts property keys to strings (brilliant), so we use parseInt() to convert them back to numbers.
|
|
*/
|
|
port = parseInt(port, 10);
|
|
this.addPortOutputNotify(port + offset, port + offset, component, table[port]);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* checkPortOutputNotify(port, bOut, addrFrom)
|
|
*
|
|
* @this {Bus}
|
|
* @param {number} port
|
|
* @param {number} bOut
|
|
* @param {number} [addrFrom] is the EIP value at the time of the output
|
|
*/
|
|
Bus.prototype.checkPortOutputNotify = function(port, bOut, addrFrom)
|
|
{
|
|
var aNotify = this.aPortOutputNotify[port];
|
|
if (aNotify !== undefined) {
|
|
if (aNotify[1]) {
|
|
aNotify[1].call(aNotify[0], port, bOut, addrFrom);
|
|
}
|
|
if (DEBUGGER && this.dbg && this.fPortOutputBreakAll != aNotify[2]) {
|
|
this.dbg.checkPortOutput(port, bOut);
|
|
}
|
|
}
|
|
else {
|
|
if (DEBUGGER && this.dbg) {
|
|
this.dbg.messagePort(this, port, bOut, addrFrom);
|
|
if (this.fPortOutputBreakAll) this.dbg.checkPortOutput(port, bOut);
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* removePortOutputNotify(start, end, component, fn)
|
|
*
|
|
* Remove a port output-notification handler from the list of such handlers (to be ENABLED later if needed)
|
|
*
|
|
* @this {Bus}
|
|
* @param {number} start address
|
|
* @param {number} end address
|
|
* @param {Component} component
|
|
* @param {function(number,number)} fn of previously added handler
|
|
*
|
|
Bus.prototype.removePortOutputNotify = function(start, end, component, fn)
|
|
{
|
|
for (var port = start; port < end; port++) {
|
|
if (this.aPortOutputNotify[port] && this.aPortOutputNotify[port][0] == component && this.aPortOutputNotify[port][1] == fn) {
|
|
this.aPortOutputNotify[port] = undefined;
|
|
}
|
|
}
|
|
};
|
|
*/
|
|
|
|
/**
|
|
* reportError(op, addr, size)
|
|
*
|
|
* @this {Bus}
|
|
* @param {number} op
|
|
* @param {number} addr
|
|
* @param {number} size
|
|
* @return {boolean} false
|
|
*/
|
|
Bus.prototype.reportError = function(op, addr, size)
|
|
{
|
|
Component.error("Memory block error (" + op + "," + str.toHex(addr) + "," + str.toHex(size) + ")");
|
|
return false;
|
|
};
|
|
|
|
if (typeof APP_PCJS !== 'undefined') APP_PCJS.Bus = Bus;
|
|
|
|
if (typeof module !== 'undefined') module.exports = Bus;
|