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AddressDecoder
This commit is contained in:
Steven Hugg
parent
f649f0ec03
commit
dfbd584207
22
src/emu.js
22
src/emu.js
@ -643,3 +643,25 @@ function padBytes(data, len) {
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r.mem.set(data);
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return r.mem;
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}
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// TODO: better performance, check values
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function AddressDecoder(table) {
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var self = this;
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function makeFunction(lo, hi) {
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var s = "";
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for (var i=0; i<table.length; i++) {
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var entry = table[i];
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var start = entry[0];
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var end = entry[1];
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var mask = entry[2];
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var func = entry[3];
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self['__fn'+i] = func;
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s += "if (a>=" + start + " && a<="+end + "){";
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s += "a&="+(mask?mask:0xffff)+";";
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s += "return this.__fn"+i+"(a,v)&0xff;}\n";
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}
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s += "return 0;"; // TODO: noise()?
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return new Function('a', 'v', s);
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}
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return makeFunction(0x0, 0xffff).bind(self);
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}
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@ -150,72 +150,24 @@ var GalaxianPlatform = function(mainElement) {
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oram = new RAM(0x100);
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outlatches = new RAM(0x8);
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membus = {
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read: function(address) {
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if (address < 0x4000) {
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return (rom ? rom[address] : 0) & 0xff;
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} else if (address < 0x4800) {
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address &= 0x3ff;
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return ram.mem[address] & 0xff;
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} else if (address >= 0x5000 && address < 0x5800) {
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address &= 0x3ff;
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return vram.mem[address] & 0xff;
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} else if (address >= 0x5800 && address < 0x6000) {
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address &= 0xff;
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return oram.mem[address] & 0xff;
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} else if (address >= 0x6000 && address < 0x6800) {
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address &= 0x7;
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switch (address) {
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case 0:
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return inputs[0];
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}
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} else if (address >= 0x6800 && address < 0x7000) {
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return inputs[1];
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} else if (address >= 0x7000 && address < 0x7800) {
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address &= 0x7;
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switch (address) {
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case 0:
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return inputs[2];
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}
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} else if (address >= 0x7800 && address < 0x8000) {
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watchdog_counter = INITIAL_WATCHDOG;
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} else {
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console.log("read", hex(address));
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return 0;
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}
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},
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write: function(address, value) {
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//console.log("write", hex(address,4), hex(value,2));
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if (address >= 0x4000 && address < 0x4800) {
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address &= 0x3ff;
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ram.mem[address] = value;
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} else if (address >= 0x5000 && address < 0x5800) {
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address &= 0x3ff;
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vram.mem[address] = value;
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} else if (address >= 0x5800 && address < 0x6000) {
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address &= 0xff;
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oram.mem[address] = value;
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} else if (address >= 0x6000 && address < 0x6800) {
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address &= 0x7;
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outlatches.mem[address] = value;
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} else if (address >= 0x6800 && address < 0x7000) {
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address &= 0x7;
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// TODO: sound
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} else if (address >= 0x7000 && address < 0x7800) {
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address &= 0x7;
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switch (address) {
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case 1:
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interruptEnabled = value;
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break;
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case 4:
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starsEnabled = value;
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break;
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}
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} else if (address >= 0x7800 && address < 0x8000) {
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// TODO: sound
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} else {
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console.log("write", hex(address), hex(value));
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}
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},
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read: new AddressDecoder([
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[0x0000, 0x3fff, 0, function(a) { return rom ? rom[a] : null; }],
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[0x4000, 0x47ff, 0x3ff, function(a) { return ram.mem[a]; }],
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[0x5000, 0x57ff, 0x3ff, function(a) { return vram.mem[a]; }],
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[0x5800, 0x5fff, 0xff, function(a) { return oram.mem[a]; }],
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[0x6000, 0x6000, 0, function(a) { return inputs[0]; }],
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[0x6800, 0x6800, 0, function(a) { return inputs[1]; }],
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[0x7000, 0x7000, 0, function(a) { return inputs[2]; }],
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[0x7800, 0x7800, 0, function(a) { watchdog_counter = INITIAL_WATCHDOG; }],
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]),
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write: new AddressDecoder([
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[0x4000, 0x47ff, 0x3ff, function(a,v) { ram.mem[a] = v; }],
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[0x5000, 0x57ff, 0x3ff, function(a,v) { vram.mem[a] = v; }],
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[0x5800, 0x5fff, 0xff, function(a,v) { oram.mem[a] = v; }],
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[0x6000, 0x67ff, 0x7, function(a,v) { outlatches.mem[a] = v; }],
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[0x7001, 0x7001, 0, function(a,v) { interruptEnabled = v; }],
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[0x7004, 0x7004, 0, function(a,v) { starsEnabled = v; }],
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]),
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isContended: function() { return false; },
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};
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iobus = {
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@ -323,7 +275,7 @@ var GalaxianPlatform = function(mainElement) {
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watchdog_counter = state.wdc;
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interruptEnabled = state.ie;
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starsEnabled = state.se;
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frameCounter = fc;
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frameCounter = state.fc;
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inputs[0] = state.in0;
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inputs[1] = state.in1;
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inputs[2] = state.in2;
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@ -356,7 +308,6 @@ var GalaxianPlatform = function(mainElement) {
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this.pause = function() {
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timer.stop();
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audio.stop();
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console.log(JSON.stringify(this.saveState()));
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}
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this.resume = function() {
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timer.start();
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@ -46,29 +46,20 @@ var SpaceInvadersPlatform = function(mainElement) {
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ram = new RAM(0x2000);
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displayPCs = new Uint16Array(new ArrayBuffer(0x2000*2));
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membus = {
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read: function(address) {
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if (address < 0x2000) {
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return (rom ? rom[address] : 0) & 0xff;
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} else {
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address &= 0x1fff;
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return ram.mem[address] & 0xff;
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}
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},
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write: function(address, value) {
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//console.log("write", hex(address,4), hex(value,2));
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if (address >= 0x2000) {
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address &= 0x1fff;
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value &= 0xff;
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ram.mem[address] = value;
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if (address >= 0x400) {
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// TODO: dirty flags
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var ofs = (address - 0x400)*8;
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for (var i=0; i<8; i++)
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pixels[ofs+i] = (value & (1<<i)) ? PIXEL_ON : PIXEL_OFF;
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displayPCs[address] = cpu.getPC(); // save program counter
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}
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}
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},
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read: new AddressDecoder([
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[0x0000, 0x1fff, 0x1fff, function(a) { return rom ? rom[a] : 0; }],
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[0x2000, 0x3fff, 0x1fff, function(a) { return ram.mem[a]; }],
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]),
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write: new AddressDecoder([
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[0x2000, 0x23ff, 0x3ff, function(a,v) { ram.mem[a] = v; }],
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[0x2400, 0x3fff, 0x1fff, function(a,v) {
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ram.mem[a] = v;
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var ofs = (a - 0x400)<<3;
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for (var i=0; i<8; i++)
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pixels[ofs+i] = (v & (1<<i)) ? PIXEL_ON : PIXEL_OFF;
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displayPCs[a] = cpu.getPC(); // save program counter
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}],
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]),
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isContended: function() { return false; },
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};
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iobus = {
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@ -381,6 +381,7 @@ worker.onmessage = function(e) {
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}
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if (rom_changed || trace_pending_at_pc) {
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// update editor annotations
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// TODO: do incrementally for performance
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editor.clearGutter("gutter-info");
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editor.clearGutter("gutter-bytes");
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editor.clearGutter("gutter-offset");
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33
test/cli/testdecoder.js
Normal file
33
test/cli/testdecoder.js
Normal file
@ -0,0 +1,33 @@
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var vm = require('vm');
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var fs = require('fs');
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var includeInThisContext = function(path) {
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var code = fs.readFileSync(path);
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vm.runInThisContext(code, path);
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};
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includeInThisContext("src/emu.js");
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function assert(b, msg) {
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if (!b) { throw new Error(msg); }
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}
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function assertEquals(a,b) {
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assert(a==b, a + " != " + b);
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}
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describe('Test address decoder', function() {
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it('Should work empty', function() {
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var decoder = new AddressDecoder([]);
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assertEquals(0, decoder(0x1234));
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assertEquals(0, decoder(0x123456));
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});
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it('Should work with 1 range', function() {
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var decoder = new AddressDecoder([
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[0x1000, 0x7fff, 0xff, function(a) { return a+2; }]
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]);
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assertEquals(0, decoder(0xfff));
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assertEquals(2, decoder(0x1000));
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assertEquals(1, decoder(0x7fff));
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assertEquals(0, decoder(0x8000));
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});
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});
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