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Support for true physical memory aliases

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This commit is contained in:
Jeff Parsons 2015-03-23 18:15:29 -07:00 • committed by jeffpar
commit 7085b72fc4
28 changed files with 2185 additions and 2047 deletions
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25
modules/pcjs/lib/rom.js
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@ -285,7 +285,7 @@ ROM.prototype.copyROM = function()
* good idea to stop the machine in its tracks whenever a setError() occurs, but there may also be
* times when we'd like to forge ahead anyway.
*/
this.setError("ROM size (0x" + str.toHex(this.abROM.length) + ") does not match specified size (0x" + str.toHex(this.sizeROM) + ")");
this.setError("ROM size (" + str.toHexLong(this.abROM.length) + ") does not match specified size (" + str.toHexLong(this.sizeROM) + ")");
}
else if (this.addROM(this.addrROM)) {
@ -296,7 +296,7 @@ ROM.prototype.copyROM = function()
aliases = this.addrAlias;
}
for (var i = 0; i < aliases.length; i++) {
this.addROM(aliases[i]);
this.cloneROM(aliases[i]);
}
/*
* If there's a component we should notify, notify it now, and give it the internal byte array, so that
@ -336,7 +336,7 @@ ROM.prototype.copyROM = function()
ROM.prototype.addROM = function(addr)
{
if (this.bus.addMemory(addr, this.sizeROM, Memory.TYPE.ROM)) {
if (DEBUG) this.log("addROM(): copying ROM to 0x" + str.toHex(addr) + " (0x" + str.toHex(this.abROM.length) + " bytes)");
if (DEBUG) this.log("addROM(): copying ROM to " + str.toHexLong(addr) + " (" + str.toHexLong(this.abROM.length) + " bytes)");
var bto = null;
for (var off = 0; off < this.abROM.length; off++) {
this.bus.setByteDirect(addr + off, this.abROM[off]);
@ -353,6 +353,25 @@ ROM.prototype.addROM = function(addr)
return false;
};
/**
* cloneROM(addr)
*
* For ROMs with one or more alias addresses, we used to call addROM() for each address. However,
* that obviously wasted memory, since each alias was an independent copy, and if you used the
* Debugger to edit the ROM in one location, the changes would not appear in the other location(s).
*
* Now that the Bus component provides low-level getMemoryBlocks() and setMemoryBlocks() methods
* to manually get and set the blocks of any memory range, it is now possible to create true aliases.
*
* @this {ROM}
* @param {number} addr
*/
ROM.prototype.cloneROM = function(addr)
{
var aBlocks = this.bus.getMemoryBlocks(this.addrROM, this.sizeROM);
this.bus.setMemoryBlocks(addr, this.sizeROM, aBlocks);
};
/**
* ROM.init()
*