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Changed C1Pjs to display 25 rows instead of 24

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This commit is contained in:
Jeff Parsons 2015-02-24 13:56:26 -08:00 • committed by jeffpar
commit 9ba73970a4
15 changed files with 64 additions and 43 deletions
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24
modules/pcjs/lib/x86cpu.js
View file

@ -807,8 +807,26 @@ X86CPU.prototype.reset = function()
* the test. A nonzero value in EAX after self-test indicates that the particular 80386 unit is faulty.
* If the self-test is not requested, the contents of EAX after RESET is undefined.
*
* DX holds a component identifier and revision number after RESET as Figure 10-1 illustrates. DH contains 3,
* which indicates an 80386 component. DL contains a unique identifier of the revision level.
* DX holds a component identifier and revision number after RESET as Figure 10-1 illustrates. DH contains
* 3, which indicates an 80386 component. DL contains a unique identifier of the revision level.
*
* EFLAGS = 0x00000002
* IP = 0x0000FFF0
* CS selector = 0xF000 (base of 0xFFFF0000 and limit of 0xFFFF)
* DS selector = 0x0000
* ES selector = 0x0000
* SS selector = 0x0000
* FS selector = 0x0000
* GS selector = 0x0000
* IDTR = base of 0 and limit of 0x3FF
*
* All other 80386 registers are undefined after a reset (that is, Intel declined to document precisely how
* the hardware initializes any other registers, as if that would stop everyone from making any assumptions).
*
* We've elected to set DX to 0x0304 on a reset, which is consistent with a 80386-C0, since we have no desire to
* try to emulate all the bugs in older (eg, B1) steppings. At least not initially. We leave stepping-accurate
* emulation for another day. It's also known that the B1 reported 0x0303 in DX, but other than the B1 and C0
* steppings, it's not known exactly what other revision numbers Intel used in 80386 CPUs.
*
* We define some additional "registers", such as regLIP. which mirrors the linear address corresponding to
* CS:IP (the address of the next opcode byte). In fact, regLIP functions as our internal IP register, so any
@ -879,7 +897,7 @@ X86CPU.prototype.resetRegs = function()
this.setSS(0);
if (I386 && this.model >= X86.MODEL_80386) {
this.regEDX = 0x0303; // Intel documentation indicates this is what an 80386-B1 reported
this.regEDX = 0x0304; // Intel errata sheets indicate this is what an 80386-C0 reported
this.regCR0 = X86.CR0.ET; // formerly MSW
this.regCR1 = 0; // reserved
this.regCR2 = 0; // page fault linear address (PFLA)

2
modules/pcjs/lib/x86help.js
View file

@ -52,7 +52,7 @@ var X86Help = {
* @this {X86CPU}
* @param {number} dst (current value, ignored)
* @param {number} src (new value)
* @return {number} dst (src is overridden, replaced with regMD16, as specified by opMOVSegSrc)
* @return {number} dst (src is overridden, replaced with regMD16, as specified by opMOVwsr())
*/
opHelpMOVSegSrc: function(dst, src) {
return X86Help.opHelpMOV.call(this, dst, this.regMD16);

28
modules/pcjs/lib/x86opxx.js
View file

@ -1937,21 +1937,21 @@ var X86OpXX = {
var bModRM = this.getIPByte();
var reg = (bModRM & 0x38) >> 3;
switch (reg) {
case 0x0:
this.regMD16 = this.segES.sel;
break;
case 0x1:
this.regMD16 = this.segCS.sel;
break;
case 0x0:
this.regMD16 = this.segES.sel;
break;
case 0x1:
this.regMD16 = this.segCS.sel;
break;
case 0x2:
this.regMD16 = this.segSS.sel;
break;
case 0x3:
this.regMD16 = this.segDS.sel;
break;
default:
X86Help.opHelpUndefined.call(this);
return;
this.regMD16 = this.segSS.sel;
break;
case 0x3:
this.regMD16 = this.segDS.sel;
break;
default:
X86Help.opHelpUndefined.call(this);
return;
}
/*
* Like other MOV operations, the destination does not need to be read, just written.