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Improved separation of FDC media parameters from drive parameters

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This commit is contained in:
Jeff Parsons 2014-10-20 00:24:13 -05:00 • committed by jeffpar
commit 1809543577
32 changed files with 1915 additions and 1887 deletions
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30
my_modules/pcjs-client/lib/x86seg.js
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@ -34,17 +34,17 @@
"use strict";
if (typeof module !== 'undefined') {
var X86 = require("./x86");
var X86Help = require("./x86help");
var X86 = require("./x86");
var X86Help = require("./x86help");
}
/**
* X86Seg(cpu, sName)
*
*
* @constructor
* @param {X86CPU} cpu
* @param {string} [sName] segment name
* @param {boolean} [fProt] true if segment register used exclusively in protected-mode
* @param {boolean} [fProt] true if segment register used exclusively in protected-mode
*/
function X86Seg(cpu, sName, fProt)
{
@ -64,7 +64,7 @@ function X86Seg(cpu, sName, fProt)
/**
* loadReal(sel, fSuppress)
*
*
* This is the default real-mode load() function.
*
* @this {X86Seg}
@ -84,7 +84,7 @@ X86Seg.loadReal = function loadReal(sel, fSuppress)
*
* This replaces the segment's default load() function whenever the segment is notified (eg, by the CPU's setProtMode()
* function) the processor is now in protected-mode.
*
*
* Segments in protected-mode are referenced by selectors, which are indexes into descriptor tables (GDT, LDT, IDT) whose
* descriptors are 4-word (8-byte) entries:
*
@ -92,7 +92,7 @@ X86Seg.loadReal = function loadReal(sel, fSuppress)
* word 1: base address low
* word 2: base address high (0-7), segment type (8-11), descriptor type (12), DPL (13-14), present bit (15)
* word 3: used only on 80386 and up (should be set to zero for upward compatibility)
*
*
* See X86.DESC for offset and bit definitions.
*
* @this {X86Seg}
@ -115,23 +115,23 @@ X86Seg.loadProt = function loadProt(sel, fSuppress)
if (offDT + 7 <= addrDTLimit) {
this.checkRead = X86Seg.checkReadProtEnabled;
this.checkWrite = X86Seg.checkWriteProtEnabled;
/*
* TODO: This is only the first of many steps toward accurately counting cycles in protected mode;
* I simply noted that "POP segreg" takes 5 cycles in real mode and 20 in protected mode, so I'm
* starting with a 15-cycle difference. Obviously the difference will be much greater when the load fails.
*/
this.cpu.nStepCycles -= 15;
/*
* TODO: Use (direct) Bus memory interfaces instead of (indirect) CPU memory interfaces here?
*/
var limit = this.cpu.getWord(offDT + X86.DESC.LIMIT.OFFSET);
var acc = this.cpu.getWord(offDT + X86.DESC.ACC.OFFSET);
var base = this.cpu.getWord(offDT + X86.DESC.BASE.OFFSET) | ((acc & X86.DESC.ACC.BASE1623) << 16);
Component.assert(this.cpu.getWord(offDT + 0x06) == 0);
/*
* For LSL (which uses fSuppress), we must support X86.DESC.ACC.TYPE.SEG as well as TSS and LDT.
*/
@ -271,7 +271,7 @@ X86Seg.checkWriteProtDisabled = function checkWriteProtDisabled(off, cb, fSuppre
*
* Early versions of PCjs saved only segment selectors, since that's all that mattered in real-mode;
* newer versions need to save/restore the entire segment object.
*
*
* @this {X86Seg}
* @return {Array}
*/
@ -285,7 +285,7 @@ X86Seg.prototype.save = function()
*
* Early versions of PCjs saved only segment selectors, since that's all that mattered in real-mode;
* newer versions need to save/restore the entire segment object.
*
*
* @this {X86Seg}
* @param {Array|number} a
*/
@ -305,12 +305,12 @@ X86Seg.prototype.restore = function(a)
/**
* setBase(addr)
*
*
* This is used in unusual situations where the base must be set independently; normally, the base
* is set according to the selector provided to load(), but there are a few cases where setBase() is
* required (eg, in resetRegs() where the 80286 wants the real-mode CS selector to be 0xF000 but the
* CS base must be 0xFF0000, and LOADALL).
*
*
* @this {X86Seg}
* @param {number} addr
*/