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Update CPU's getLong() and setLong() interfaces

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This commit is contained in:
Jeff Parsons 2015-01-25 15:07:58 -08:00 • committed by jeffpar
commit 7fb26846f9
4 changed files with 62 additions and 34 deletions
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42
modules/pcjs/lib/x86cpu.js
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@ -1906,7 +1906,7 @@ X86CPU.prototype.getWord = function(addr)
*
* @this {X86CPU}
* @param {number} addr is a physical (non-segmented) address
* @return {number} word (32-bit) value at that address
* @return {number} long (32-bit) value at that address
*/
X86CPU.prototype.getLong = function(addr)
{
@ -1916,13 +1916,11 @@ X86CPU.prototype.getLong = function(addr)
this.backTrack.btiMemLo = this.bus.readBackTrack(addr);
this.backTrack.btiMemHi = this.bus.readBackTrack(addr + 1);
}
var nShift = (off & 0x3) << 3;
var dw = this.aMemBlocks[iBlock].readLong(off & ~0x3);
if (nShift) {
dw >>>= nShift;
dw |= (this.aMemBlocks[(iBlock + 1) & this.blockMask].readLong(0) << (32 - nShift));
if (off < this.blockLimit - 2) {
return this.aMemBlocks[iBlock].readLong(off);
}
return dw;
var nShift = (off & 0x3) << 3;
return (this.aMemBlocks[iBlock].readLong(off & ~0x3) >>> nShift) | (this.aMemBlocks[(iBlock + 1) & this.blockMask].readLong(0) << (32 - nShift));
};
/**
@ -1967,6 +1965,36 @@ X86CPU.prototype.setWord = function(addr, w)
this.aMemBlocks[iBlock & this.blockMask].writeByte(0, (w >> 8) & 0xff);
};
/**
* setLong(addr, l)
*
* @this {X86CPU}
* @param {number} addr is a physical (non-segmented) address
* @param {number} l is the long (32-bit) value to write
*/
X86CPU.prototype.setLong = function(addr, l)
{
var off = addr & this.blockLimit;
var iBlock = (addr & this.addrMemMask) >> this.blockShift;
this.nStepCycles -= this.CYCLES.nWordCyclePenalty;
if (BACKTRACK) {
this.bus.writeBackTrack(addr, this.backTrack.btiMemLo);
this.bus.writeBackTrack(addr + 1, this.backTrack.btiMemHi);
}
if (off < this.blockLimit - 2) {
this.aMemBlocks[iBlock].writeLong(off, l);
return;
}
var lPrev, nShift = (off & 0x3) << 3;
off &= ~0x3;
lPrev = this.aMemBlocks[iBlock].readLong(off);
this.aMemBlocks[iBlock].writeLong(off, (lPrev & ~(0xffffffff << nShift)) | (l << nShift));
iBlock = (iBlock + 1) & this.blockMask;
lPrev = this.aMemBlocks[iBlock].readLong(0);
this.aMemBlocks[iBlock].writeLong(0, (lPrev & (0xffffffff << nShift)) | (l >>> (32 - nShift)));
};
/**
* getEAByte(seg, off)
*