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Groundwork laid for upcoming BACKTRACK support

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This commit is contained in:
Jeff Parsons 2014-12-23 16:02:41 -08:00 • committed by jeffpar
commit 2034428e9f
17 changed files with 5524 additions and 3147 deletions
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27
modules/pcjs/lib/rom.js
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@ -90,21 +90,21 @@ Component.subclass(Component, ROM);
/*
* ROM BIOS Data Area (RBDA) definitions, in physical address form, using the same ALL-CAPS names
* found in the original IBM PC ROM BIOS listing.
*
* TODO: Fill in remaining RBDA holes.
* found in the original IBM PC ROM BIOS listing. TODO: Fill in remaining RBDA holes.
*/
ROM.BIOS = {};
ROM.BIOS.RS232_BASE = 0x400; // 4 (word) I/O addresses of RS-232 adapters
ROM.BIOS.PRINTER_BASE = 0x408; // 4 (word) I/O addresses of printer adapters
ROM.BIOS.EQUIP_FLAG = 0x410; // installed hardware (word)
ROM.BIOS.MFG_TEST = 0x412; // initialization flag (byte)
ROM.BIOS.MEMORY_SIZE = 0x413; // memory size in K-bytes (word)
ROM.BIOS.RESET_FLAG = 0x472; // set to 0x1234 if keyboard reset underway (word)
ROM.BIOS.RESET_FLAG_WARMBOOT = 0x1234; // value stored at ROM.BIOS.RESET_FLAG to indicate a "warm boot", bypassing memory tests
ROM.BIOS = {
RS232_BASE: 0x400, // 4 (word) I/O addresses of RS-232 adapters
PRINTER_BASE: 0x408, // 4 (word) I/O addresses of printer adapters
EQUIP_FLAG: 0x410, // installed hardware (word)
MFG_TEST: 0x412, // initialization flag (byte)
MEMORY_SIZE: 0x413, // memory size in K-bytes (word)
RESET_FLAG: 0x472 // set to 0x1234 if keyboard reset underway (word)
};
// RESET_FLAG is the traditional end of the RBDA, as originally defined at real-mode segment 0x40.
ROM.BIOS.RESET_FLAG_WARMBOOT = 0x1234; // value stored at ROM.BIOS.RESET_FLAG to indicate a "warm boot", bypassing memory tests
/*
* NOTE: There's currently no need for this component to have a reset() function, since
* once the ROM data is loaded, it can't be changed, so there's nothing to reinitialize.
@ -316,8 +316,13 @@ ROM.prototype.addROM = function(addr)
if (addr == null) return true;
if (this.bus.addMemory(addr, this.sizeROM, true)) {
if (DEBUG) this.log("addROM(): copying ROM to " + str.toHexAddr(addr) + " (0x" + str.toHex(this.abROM.length) + " bytes)");
var bto = null;
for (var i = 0; i < this.abROM.length; i++) {
this.bus.setByteDirect(addr + i, this.abROM[i]);
if (BACKTRACK) {
bto = this.bus.addBackTrackObject(this, bto, i);
this.bus.setBackTrackIndex(addr + i, bto, i);
}
}
return true;
}