Split massive emulator code into logical parts.
This commit is contained in:
Anselm Levskaya
parent
e3133b25ad
commit
480a1c2e68
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/*
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Fabrix - An annotated version of the original JSLinux which is Copyright (c) 2011 Fabrice Bellard
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Clock Emulator
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*/
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function Lg(a) { return ((a / 10) << 4) | (a % 10);}
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function CMOS(Ng) {
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var Og, d;
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Og = new Uint8Array(128);
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this.cmos_data = Og;
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this.cmos_index = 0;
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d = new Date();
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Og[0] = Lg(d.getUTCSeconds());
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Og[2] = Lg(d.getUTCMinutes());
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Og[4] = Lg(d.getUTCHours());
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Og[6] = Lg(d.getUTCDay());
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Og[7] = Lg(d.getUTCDate());
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Og[8] = Lg(d.getUTCMonth() + 1);
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Og[9] = Lg(d.getUTCFullYear() % 100);
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Og[10] = 0x26;
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Og[11] = 0x02;
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Og[12] = 0x00;
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Og[13] = 0x80;
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Og[0x14] = 0x02;
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Ng.register_ioport_write(0x70, 2, 1, this.ioport_write.bind(this));
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Ng.register_ioport_read(0x70, 2, 1, this.ioport_read.bind(this));
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}
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CMOS.prototype.ioport_write = function(mem8_loc, Ig) {
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if (mem8_loc == 0x70) {
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this.cmos_index = Ig & 0x7f;
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}
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};
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CMOS.prototype.ioport_read = function(mem8_loc) {
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var Pg;
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if (mem8_loc == 0x70) {
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return 0xff;
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} else {
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Pg = this.cmos_data[this.cmos_index];
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if (this.cmos_index == 10)
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this.cmos_data[10] ^= 0x80;
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else if (this.cmos_index == 12)
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this.cmos_data[12] = 0x00;
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return Pg;
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}
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};
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/*
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Fabrix - An annotated version of the original JSLinux which is Copyright (c) 2011 Fabrice Bellard
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Keyboard Device Emulator
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*/
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function KBD(Ng, ph) {
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Ng.register_ioport_read(0x64, 1, 1, this.read_status.bind(this));
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Ng.register_ioport_write(0x64, 1, 1, this.write_command.bind(this));
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this.reset_request = ph;
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}
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KBD.prototype.read_status = function(mem8_loc) {
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return 0;
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};
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KBD.prototype.write_command = function(mem8_loc, x) {
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switch (x) {
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case 0xfe:
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this.reset_request();
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break;
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default:
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break;
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}
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};
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/*
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Fabrix - An annotated version of the original JSLinux which is Copyright (c) 2011 Fabrice Bellard
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Main PC Emulator Routine
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*/
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function set_hard_irq_wrapper(irq) { this.hard_irq = irq;}
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function return_cycle_count() { return this.cycle_count; }
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function PCEmulator(uh) {
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var cpu;
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cpu = new CPU_X86();
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this.cpu = cpu;
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cpu.phys_mem_resize(uh.mem_size);
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this.init_ioports();
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this.register_ioport_write(0x80, 1, 1, this.ioport80_write);
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this.pic = new PIC_Controller(this, 0x20, 0xa0, set_hard_irq_wrapper.bind(cpu));
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this.pit = new PIT(this, this.pic.set_irq.bind(this.pic, 0), return_cycle_count.bind(cpu));
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this.cmos = new CMOS(this);
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this.serial = new Serial(this, 0x3f8, this.pic.set_irq.bind(this.pic, 4), uh.serial_write);
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this.kbd = new KBD(this, this.reset.bind(this));
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this.reset_request = 0;
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if (uh.clipboard_get && uh.clipboard_set) {
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this.jsclipboard = new clipboard_device(this, 0x3c0, uh.clipboard_get, uh.clipboard_set, uh.get_boot_time);
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}
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cpu.ld8_port = this.ld8_port.bind(this);
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cpu.ld16_port = this.ld16_port.bind(this);
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cpu.ld32_port = this.ld32_port.bind(this);
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cpu.st8_port = this.st8_port.bind(this);
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cpu.st16_port = this.st16_port.bind(this);
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cpu.st32_port = this.st32_port.bind(this);
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cpu.get_hard_intno = this.pic.get_hard_intno.bind(this.pic);
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}
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PCEmulator.prototype.load_binary = function(Gg, ha) { return this.cpu.load_binary(Gg, ha); };
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PCEmulator.prototype.start = function() { setTimeout(this.timer_func.bind(this), 10); };
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PCEmulator.prototype.timer_func = function() {
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var La, vh, wh, xh, yh, Ng, cpu;
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Ng = this;
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cpu = Ng.cpu;
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wh = cpu.cycle_count + 100000;
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xh = false;
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yh = false;
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zh: while (cpu.cycle_count < wh) {
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Ng.pit.update_irq();
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La = cpu.exec(wh - cpu.cycle_count);
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if (La == 256) {
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if (Ng.reset_request) {
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xh = true;
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break;
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}
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} else if (La == 257) {
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yh = true;
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break;
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} else {
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xh = true;
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break;
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}
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}
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if (!xh) {
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if (yh) {
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setTimeout(this.timer_func.bind(this), 10);
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} else {
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setTimeout(this.timer_func.bind(this), 0);
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}
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}
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};
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PCEmulator.prototype.init_ioports = function() {
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var i, Ah, Bh;
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this.ioport_readb_table = new Array();
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this.ioport_writeb_table = new Array();
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this.ioport_readw_table = new Array();
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this.ioport_writew_table = new Array();
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this.ioport_readl_table = new Array();
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this.ioport_writel_table = new Array();
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Ah = this.default_ioport_readw.bind(this);
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Bh = this.default_ioport_writew.bind(this);
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for (i = 0; i < 1024; i++) {
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this.ioport_readb_table[i] = this.default_ioport_readb;
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this.ioport_writeb_table[i] = this.default_ioport_writeb;
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this.ioport_readw_table[i] = Ah;
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this.ioport_writew_table[i] = Bh;
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this.ioport_readl_table[i] = this.default_ioport_readl;
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this.ioport_writel_table[i] = this.default_ioport_writel;
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}
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};
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PCEmulator.prototype.default_ioport_readb = function(Zf) {
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var x;
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x = 0xff;
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return x;
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};
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PCEmulator.prototype.default_ioport_readw = function(Zf) {
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var x;
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x = this.ioport_readb_table[Zf](Zf);
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Zf = (Zf + 1) & (1024 - 1);
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x |= this.ioport_readb_table[Zf](Zf) << 8;
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return x;
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};
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PCEmulator.prototype.default_ioport_readl = function(Zf) {
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var x;
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x = -1;
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return x;
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};
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PCEmulator.prototype.default_ioport_writeb = function(Zf, x) {};
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PCEmulator.prototype.default_ioport_writew = function(Zf, x) {
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this.ioport_writeb_table[Zf](Zf, x & 0xff);
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Zf = (Zf + 1) & (1024 - 1);
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this.ioport_writeb_table[Zf](Zf, (x >> 8) & 0xff);
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};
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PCEmulator.prototype.default_ioport_writel = function(Zf, x) {};
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PCEmulator.prototype.ld8_port = function(Zf) {
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var x;
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x = this.ioport_readb_table[Zf & (1024 - 1)](Zf);
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return x;
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};
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PCEmulator.prototype.ld16_port = function(Zf) {
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var x;
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x = this.ioport_readw_table[Zf & (1024 - 1)](Zf);
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return x;
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};
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PCEmulator.prototype.ld32_port = function(Zf) {
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var x;
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x = this.ioport_readl_table[Zf & (1024 - 1)](Zf);
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return x;
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};
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PCEmulator.prototype.st8_port = function(Zf, x) { this.ioport_writeb_table[Zf & (1024 - 1)](Zf, x); };
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PCEmulator.prototype.st16_port = function(Zf, x) { this.ioport_writew_table[Zf & (1024 - 1)](Zf, x); };
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PCEmulator.prototype.st32_port = function(Zf, x) { this.ioport_writel_table[Zf & (1024 - 1)](Zf, x); };
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PCEmulator.prototype.register_ioport_read = function(start, tg, cc, Ch) {
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var i;
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switch (cc) {
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case 1:
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for (i = start; i < start + tg; i++) {
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this.ioport_readb_table[i] = Ch;
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}
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break;
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case 2:
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for (i = start; i < start + tg; i += 2) {
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this.ioport_readw_table[i] = Ch;
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}
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break;
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case 4:
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for (i = start; i < start + tg; i += 4) {
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this.ioport_readl_table[i] = Ch;
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}
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break;
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}
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};
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PCEmulator.prototype.register_ioport_write = function(start, tg, cc, Ch) {
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var i;
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switch (cc) {
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case 1:
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for (i = start; i < start + tg; i++) {
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this.ioport_writeb_table[i] = Ch;
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}
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break;
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case 2:
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for (i = start; i < start + tg; i += 2) {
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this.ioport_writew_table[i] = Ch;
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}
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break;
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case 4:
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for (i = start; i < start + tg; i += 4) {
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this.ioport_writel_table[i] = Ch;
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}
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break;
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}
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};
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PCEmulator.prototype.ioport80_write = function(mem8_loc, Ig) {};
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PCEmulator.prototype.reset = function() { this.request_request = 1; };
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/*
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Fabrix - An annotated version of the original JSLinux which is Copyright (c) 2011 Fabrice Bellard
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8259 PIC (Programmable Interrupt Controller) Emulation Code
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*/
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function PIC(Ng, Zf) {
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Ng.register_ioport_write(Zf, 2, 1, this.ioport_write.bind(this));
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Ng.register_ioport_read(Zf, 2, 1, this.ioport_read.bind(this));
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this.reset();
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}
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PIC.prototype.reset = function() {
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this.last_irr = 0;
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this.irr = 0;
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this.imr = 0;
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this.isr = 0;
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this.priority_add = 0;
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this.irq_base = 0;
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this.read_reg_select = 0;
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this.special_mask = 0;
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this.init_state = 0;
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this.auto_eoi = 0;
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this.rotate_on_autoeoi = 0;
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this.init4 = 0;
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this.elcr = 0;
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this.elcr_mask = 0;
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};
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PIC.prototype.set_irq1 = function(Rg, Qf) {
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var wc;
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wc = 1 << Rg;
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if (Qf) {
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if ((this.last_irr & wc) == 0)
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this.irr |= wc;
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this.last_irr |= wc;
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} else {
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this.last_irr &= ~wc;
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}
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};
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PIC.prototype.get_priority = function(wc) {
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var Sg;
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if (wc == 0)
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return -1;
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Sg = 7;
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while ((wc & (1 << ((Sg + this.priority_add) & 7))) == 0)
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Sg--;
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return Sg;
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};
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PIC.prototype.get_irq = function() {
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var wc, Tg, Sg;
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wc = this.irr & ~this.imr;
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Sg = this.get_priority(wc);
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if (Sg < 0)
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return -1;
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Tg = this.get_priority(this.isr);
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if (Sg > Tg) {
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return Sg;
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} else {
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return -1;
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}
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};
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PIC.prototype.intack = function(Rg) {
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if (this.auto_eoi) {
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if (this.rotate_on_auto_eoi)
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this.priority_add = (Rg + 1) & 7;
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} else {
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this.isr |= (1 << Rg);
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}
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if (!(this.elcr & (1 << Rg)))
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this.irr &= ~(1 << Rg);
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};
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PIC.prototype.ioport_write = function(mem8_loc, x) {
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var Sg;
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mem8_loc &= 1;
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if (mem8_loc == 0) {
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if (x & 0x10) {
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this.reset();
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this.init_state = 1;
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this.init4 = x & 1;
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if (x & 0x02)
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throw "single mode not supported";
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if (x & 0x08)
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throw "level sensitive irq not supported";
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} else if (x & 0x08) {
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if (x & 0x02)
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this.read_reg_select = x & 1;
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if (x & 0x40)
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this.special_mask = (x >> 5) & 1;
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} else {
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switch (x) {
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case 0x00:
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case 0x80:
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this.rotate_on_autoeoi = x >> 7;
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break;
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case 0x20:
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case 0xa0:
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Sg = this.get_priority(this.isr);
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if (Sg >= 0) {
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this.isr &= ~(1 << ((Sg + this.priority_add) & 7));
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}
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if (x == 0xa0)
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this.priority_add = (this.priority_add + 1) & 7;
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break;
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case 0x60:
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case 0x61:
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case 0x62:
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case 0x63:
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case 0x64:
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case 0x65:
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case 0x66:
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case 0x67:
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Sg = x & 7;
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this.isr &= ~(1 << Sg);
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break;
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case 0xc0:
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case 0xc1:
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case 0xc2:
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case 0xc3:
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case 0xc4:
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case 0xc5:
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case 0xc6:
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case 0xc7:
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this.priority_add = (x + 1) & 7;
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break;
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case 0xe0:
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case 0xe1:
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case 0xe2:
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case 0xe3:
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case 0xe4:
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case 0xe5:
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case 0xe6:
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case 0xe7:
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Sg = x & 7;
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this.isr &= ~(1 << Sg);
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this.priority_add = (Sg + 1) & 7;
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break;
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}
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}
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} else {
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switch (this.init_state) {
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case 0:
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this.imr = x;
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this.update_irq();
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break;
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case 1:
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this.irq_base = x & 0xf8;
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this.init_state = 2;
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break;
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case 2:
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if (this.init4) {
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this.init_state = 3;
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} else {
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this.init_state = 0;
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}
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break;
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case 3:
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this.auto_eoi = (x >> 1) & 1;
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this.init_state = 0;
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break;
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}
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}
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};
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PIC.prototype.ioport_read = function(Ug) {
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var mem8_loc, Pg;
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mem8_loc = Ug & 1;
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if (mem8_loc == 0) {
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if (this.read_reg_select)
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Pg = this.isr;
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else
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Pg = this.irr;
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} else {
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Pg = this.imr;
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}
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return Pg;
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};
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function PIC_Controller(Ng, Wg, Ug, Xg) {
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this.pics = new Array();
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this.pics[0] = new PIC(Ng, Wg);
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this.pics[1] = new PIC(Ng, Ug);
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this.pics[0].elcr_mask = 0xf8;
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this.pics[1].elcr_mask = 0xde;
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this.irq_requested = 0;
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this.cpu_set_irq = Xg;
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this.pics[0].update_irq = this.update_irq.bind(this);
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this.pics[1].update_irq = this.update_irq.bind(this);
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}
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PIC_Controller.prototype.update_irq = function() {
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var Yg, Rg;
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Yg = this.pics[1].get_irq();
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if (Yg >= 0) {
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this.pics[0].set_irq1(2, 1);
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this.pics[0].set_irq1(2, 0);
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}
|
||||
Rg = this.pics[0].get_irq();
|
||||
if (Rg >= 0) {
|
||||
this.cpu_set_irq(1);
|
||||
} else {
|
||||
this.cpu_set_irq(0);
|
||||
}
|
||||
};
|
||||
PIC_Controller.prototype.set_irq = function(Rg, Qf) {
|
||||
this.pics[Rg >> 3].set_irq1(Rg & 7, Qf);
|
||||
this.update_irq();
|
||||
};
|
||||
PIC_Controller.prototype.get_hard_intno = function() {
|
||||
var Rg, Yg, intno;
|
||||
Rg = this.pics[0].get_irq();
|
||||
if (Rg >= 0) {
|
||||
this.pics[0].intack(Rg);
|
||||
if (Rg == 2) {
|
||||
Yg = this.pics[1].get_irq();
|
||||
if (Yg >= 0) {
|
||||
this.pics[1].intack(Yg);
|
||||
} else {
|
||||
Yg = 7;
|
||||
}
|
||||
intno = this.pics[1].irq_base + Yg;
|
||||
Rg = Yg + 8;
|
||||
} else {
|
||||
intno = this.pics[0].irq_base + Rg;
|
||||
}
|
||||
} else {
|
||||
Rg = 7;
|
||||
intno = this.pics[0].irq_base + Rg;
|
||||
}
|
||||
this.update_irq();
|
||||
return intno;
|
||||
};
|
||||
|
|
@ -0,0 +1,216 @@
|
|||
/*
|
||||
Fabrix - An annotated version of the original JSLinux which is Copyright (c) 2011 Fabrice Bellard
|
||||
|
||||
PIT Emulator
|
||||
*/
|
||||
function PIT(Ng, ah, bh) {
|
||||
var s, i;
|
||||
this.pit_channels = new Array();
|
||||
for (i = 0; i < 3; i++) {
|
||||
s = new IRQCH(bh);
|
||||
this.pit_channels[i] = s;
|
||||
s.mode = 3;
|
||||
s.gate = (i != 2) >> 0;
|
||||
s.pit_load_count(0);
|
||||
}
|
||||
this.speaker_data_on = 0;
|
||||
this.set_irq = ah;
|
||||
Ng.register_ioport_write(0x40, 4, 1, this.ioport_write.bind(this));
|
||||
Ng.register_ioport_read(0x40, 3, 1, this.ioport_read.bind(this));
|
||||
Ng.register_ioport_read(0x61, 1, 1, this.speaker_ioport_read.bind(this));
|
||||
Ng.register_ioport_write(0x61, 1, 1, this.speaker_ioport_write.bind(this));
|
||||
}
|
||||
|
||||
|
||||
|
||||
function IRQCH(bh) {
|
||||
this.count = 0;
|
||||
this.latched_count = 0;
|
||||
this.rw_state = 0;
|
||||
this.mode = 0;
|
||||
this.bcd = 0;
|
||||
this.gate = 0;
|
||||
this.count_load_time = 0;
|
||||
this.get_ticks = bh;
|
||||
this.pit_time_unit = 1193182 / 2000000;
|
||||
}
|
||||
IRQCH.prototype.get_time = function() {
|
||||
return Math.floor(this.get_ticks() * this.pit_time_unit);
|
||||
};
|
||||
IRQCH.prototype.pit_get_count = function() {
|
||||
var d, dh;
|
||||
d = this.get_time() - this.count_load_time;
|
||||
switch (this.mode) {
|
||||
case 0:
|
||||
case 1:
|
||||
case 4:
|
||||
case 5:
|
||||
dh = (this.count - d) & 0xffff;
|
||||
break;
|
||||
default:
|
||||
dh = this.count - (d % this.count);
|
||||
break;
|
||||
}
|
||||
return dh;
|
||||
};
|
||||
IRQCH.prototype.pit_get_out = function() {
|
||||
var d, eh;
|
||||
d = this.get_time() - this.count_load_time;
|
||||
switch (this.mode) {
|
||||
default:
|
||||
case 0:
|
||||
eh = (d >= this.count) >> 0;
|
||||
break;
|
||||
case 1:
|
||||
eh = (d < this.count) >> 0;
|
||||
break;
|
||||
case 2:
|
||||
if ((d % this.count) == 0 && d != 0)
|
||||
eh = 1;
|
||||
else
|
||||
eh = 0;
|
||||
break;
|
||||
case 3:
|
||||
eh = ((d % this.count) < (this.count >> 1)) >> 0;
|
||||
break;
|
||||
case 4:
|
||||
case 5:
|
||||
eh = (d == this.count) >> 0;
|
||||
break;
|
||||
}
|
||||
return eh;
|
||||
};
|
||||
IRQCH.prototype.get_next_transition_time = function() {
|
||||
var d, fh, base, gh;
|
||||
d = this.get_time() - this.count_load_time;
|
||||
switch (this.mode) {
|
||||
default:
|
||||
case 0:
|
||||
case 1:
|
||||
if (d < this.count)
|
||||
fh = this.count;
|
||||
else
|
||||
return -1;
|
||||
break;
|
||||
case 2:
|
||||
base = (d / this.count) * this.count;
|
||||
if ((d - base) == 0 && d != 0)
|
||||
fh = base + this.count;
|
||||
else
|
||||
fh = base + this.count + 1;
|
||||
break;
|
||||
case 3:
|
||||
base = (d / this.count) * this.count;
|
||||
gh = ((this.count + 1) >> 1);
|
||||
if ((d - base) < gh)
|
||||
fh = base + gh;
|
||||
else
|
||||
fh = base + this.count;
|
||||
break;
|
||||
case 4:
|
||||
case 5:
|
||||
if (d < this.count)
|
||||
fh = this.count;
|
||||
else if (d == this.count)
|
||||
fh = this.count + 1;
|
||||
else
|
||||
return -1;
|
||||
break;
|
||||
}
|
||||
fh = this.count_load_time + fh;
|
||||
return fh;
|
||||
};
|
||||
IRQCH.prototype.pit_load_count = function(x) {
|
||||
if (x == 0)
|
||||
x = 0x10000;
|
||||
this.count_load_time = this.get_time();
|
||||
this.count = x;
|
||||
};
|
||||
|
||||
|
||||
|
||||
PIT.prototype.ioport_write = function(mem8_loc, x) {
|
||||
var hh, ih, s;
|
||||
mem8_loc &= 3;
|
||||
if (mem8_loc == 3) {
|
||||
hh = x >> 6;
|
||||
if (hh == 3)
|
||||
return;
|
||||
s = this.pit_channels[hh];
|
||||
ih = (x >> 4) & 3;
|
||||
switch (ih) {
|
||||
case 0:
|
||||
s.latched_count = s.pit_get_count();
|
||||
s.rw_state = 4;
|
||||
break;
|
||||
default:
|
||||
s.mode = (x >> 1) & 7;
|
||||
s.bcd = x & 1;
|
||||
s.rw_state = ih - 1 + 0;
|
||||
break;
|
||||
}
|
||||
} else {
|
||||
s = this.pit_channels[mem8_loc];
|
||||
switch (s.rw_state) {
|
||||
case 0:
|
||||
s.pit_load_count(x);
|
||||
break;
|
||||
case 1:
|
||||
s.pit_load_count(x << 8);
|
||||
break;
|
||||
case 2:
|
||||
case 3:
|
||||
if (s.rw_state & 1) {
|
||||
s.pit_load_count((s.latched_count & 0xff) | (x << 8));
|
||||
} else {
|
||||
s.latched_count = x;
|
||||
}
|
||||
s.rw_state ^= 1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
};
|
||||
PIT.prototype.ioport_read = function(mem8_loc) {
|
||||
var Pg, ma, s;
|
||||
mem8_loc &= 3;
|
||||
s = this.pit_channels[mem8_loc];
|
||||
switch (s.rw_state) {
|
||||
case 0:
|
||||
case 1:
|
||||
case 2:
|
||||
case 3:
|
||||
ma = s.pit_get_count();
|
||||
if (s.rw_state & 1)
|
||||
Pg = (ma >> 8) & 0xff;
|
||||
else
|
||||
Pg = ma & 0xff;
|
||||
if (s.rw_state & 2)
|
||||
s.rw_state ^= 1;
|
||||
break;
|
||||
default:
|
||||
case 4:
|
||||
case 5:
|
||||
if (s.rw_state & 1)
|
||||
Pg = s.latched_count >> 8;
|
||||
else
|
||||
Pg = s.latched_count & 0xff;
|
||||
s.rw_state ^= 1;
|
||||
break;
|
||||
}
|
||||
return Pg;
|
||||
};
|
||||
PIT.prototype.speaker_ioport_write = function(mem8_loc, x) {
|
||||
this.speaker_data_on = (x >> 1) & 1;
|
||||
this.pit_channels[2].gate = x & 1;
|
||||
};
|
||||
PIT.prototype.speaker_ioport_read = function(mem8_loc) {
|
||||
var eh, s, x;
|
||||
s = this.pit_channels[2];
|
||||
eh = s.pit_get_out();
|
||||
x = (this.speaker_data_on << 1) | s.gate | (eh << 5);
|
||||
return x;
|
||||
};
|
||||
PIT.prototype.update_irq = function() {
|
||||
this.set_irq(1);
|
||||
this.set_irq(0);
|
||||
};
|
||||
|
|
@ -0,0 +1,143 @@
|
|||
/*
|
||||
Fabrix - An annotated version of the original JSLinux which is Copyright (c) 2011 Fabrice Bellard
|
||||
|
||||
Serial Controller Emulator
|
||||
*/
|
||||
|
||||
function Serial(Ng, mem8_loc, kh, lh) {
|
||||
this.divider = 0;
|
||||
this.rbr = 0;
|
||||
this.ier = 0;
|
||||
this.iir = 0x01;
|
||||
this.lcr = 0;
|
||||
this.mcr;
|
||||
this.lsr = 0x40 | 0x20;
|
||||
this.msr = 0;
|
||||
this.scr = 0;
|
||||
this.set_irq_func = kh;
|
||||
this.write_func = lh;
|
||||
this.receive_fifo = "";
|
||||
Ng.register_ioport_write(0x3f8, 8, 1, this.ioport_write.bind(this));
|
||||
Ng.register_ioport_read(0x3f8, 8, 1, this.ioport_read.bind(this));
|
||||
}
|
||||
Serial.prototype.update_irq = function() {
|
||||
if ((this.lsr & 0x01) && (this.ier & 0x01)) {
|
||||
this.iir = 0x04;
|
||||
} else if ((this.lsr & 0x20) && (this.ier & 0x02)) {
|
||||
this.iir = 0x02;
|
||||
} else {
|
||||
this.iir = 0x01;
|
||||
}
|
||||
if (this.iir != 0x01) {
|
||||
this.set_irq_func(1);
|
||||
} else {
|
||||
this.set_irq_func(0);
|
||||
}
|
||||
};
|
||||
Serial.prototype.ioport_write = function(mem8_loc, x) {
|
||||
mem8_loc &= 7;
|
||||
switch (mem8_loc) {
|
||||
default:
|
||||
case 0:
|
||||
if (this.lcr & 0x80) {
|
||||
this.divider = (this.divider & 0xff00) | x;
|
||||
} else {
|
||||
this.lsr &= ~0x20;
|
||||
this.update_irq();
|
||||
this.write_func(String.fromCharCode(x));
|
||||
this.lsr |= 0x20;
|
||||
this.lsr |= 0x40;
|
||||
this.update_irq();
|
||||
}
|
||||
break;
|
||||
case 1:
|
||||
if (this.lcr & 0x80) {
|
||||
this.divider = (this.divider & 0x00ff) | (x << 8);
|
||||
} else {
|
||||
this.ier = x;
|
||||
this.update_irq();
|
||||
}
|
||||
break;
|
||||
case 2:
|
||||
break;
|
||||
case 3:
|
||||
this.lcr = x;
|
||||
break;
|
||||
case 4:
|
||||
this.mcr = x;
|
||||
break;
|
||||
case 5:
|
||||
break;
|
||||
case 6:
|
||||
this.msr = x;
|
||||
break;
|
||||
case 7:
|
||||
this.scr = x;
|
||||
break;
|
||||
}
|
||||
};
|
||||
Serial.prototype.ioport_read = function(mem8_loc) {
|
||||
var Pg;
|
||||
mem8_loc &= 7;
|
||||
switch (mem8_loc) {
|
||||
default:
|
||||
case 0:
|
||||
if (this.lcr & 0x80) {
|
||||
Pg = this.divider & 0xff;
|
||||
} else {
|
||||
Pg = this.rbr;
|
||||
this.lsr &= ~(0x01 | 0x10);
|
||||
this.update_irq();
|
||||
this.send_char_from_fifo();
|
||||
}
|
||||
break;
|
||||
case 1:
|
||||
if (this.lcr & 0x80) {
|
||||
Pg = (this.divider >> 8) & 0xff;
|
||||
} else {
|
||||
Pg = this.ier;
|
||||
}
|
||||
break;
|
||||
case 2:
|
||||
Pg = this.iir;
|
||||
break;
|
||||
case 3:
|
||||
Pg = this.lcr;
|
||||
break;
|
||||
case 4:
|
||||
Pg = this.mcr;
|
||||
break;
|
||||
case 5:
|
||||
Pg = this.lsr;
|
||||
break;
|
||||
case 6:
|
||||
Pg = this.msr;
|
||||
break;
|
||||
case 7:
|
||||
Pg = this.scr;
|
||||
break;
|
||||
}
|
||||
return Pg;
|
||||
};
|
||||
Serial.prototype.send_break = function() {
|
||||
this.rbr = 0;
|
||||
this.lsr |= 0x10 | 0x01;
|
||||
this.update_irq();
|
||||
};
|
||||
Serial.prototype.send_char = function(mh) {
|
||||
this.rbr = mh;
|
||||
this.lsr |= 0x01;
|
||||
this.update_irq();
|
||||
};
|
||||
Serial.prototype.send_char_from_fifo = function() {
|
||||
var nh;
|
||||
nh = this.receive_fifo;
|
||||
if (nh != "" && !(this.lsr & 0x01)) {
|
||||
this.send_char(nh.charCodeAt(0));
|
||||
this.receive_fifo = nh.substr(1, nh.length - 1);
|
||||
}
|
||||
};
|
||||
Serial.prototype.send_chars = function(na) {
|
||||
this.receive_fifo += na;
|
||||
this.send_char_from_fifo();
|
||||
};
|
||||
|
|
@ -0,0 +1,69 @@
|
|||
/*
|
||||
Fabrix - An annotated version of the original JSLinux which is Copyright (c) 2011 Fabrice Bellard
|
||||
|
||||
Clipboard Device
|
||||
*/
|
||||
function clipboard_device(Ng, Zf, rh, lh, sh) {
|
||||
Ng.register_ioport_read(Zf, 16, 4, this.ioport_readl.bind(this));
|
||||
Ng.register_ioport_write(Zf, 16, 4, this.ioport_writel.bind(this));
|
||||
Ng.register_ioport_read(Zf + 8, 1, 1, this.ioport_readb.bind(this));
|
||||
Ng.register_ioport_write(Zf + 8, 1, 1, this.ioport_writeb.bind(this));
|
||||
this.cur_pos = 0;
|
||||
this.doc_str = "";
|
||||
this.read_func = rh;
|
||||
this.write_func = lh;
|
||||
this.get_boot_time = sh;
|
||||
}
|
||||
clipboard_device.prototype.ioport_writeb = function(mem8_loc, x) {
|
||||
this.doc_str += String.fromCharCode(x);
|
||||
};
|
||||
clipboard_device.prototype.ioport_readb = function(mem8_loc) {
|
||||
var c, na, x;
|
||||
na = this.doc_str;
|
||||
if (this.cur_pos < na.length) {
|
||||
x = na.charCodeAt(this.cur_pos) & 0xff;
|
||||
} else {
|
||||
x = 0;
|
||||
}
|
||||
this.cur_pos++;
|
||||
return x;
|
||||
};
|
||||
clipboard_device.prototype.ioport_writel = function(mem8_loc, x) {
|
||||
var na;
|
||||
mem8_loc = (mem8_loc >> 2) & 3;
|
||||
switch (mem8_loc) {
|
||||
case 0:
|
||||
this.doc_str = this.doc_str.substr(0, x >>> 0);
|
||||
break;
|
||||
case 1:
|
||||
return this.cur_pos = x >>> 0;
|
||||
case 2:
|
||||
na = String.fromCharCode(x & 0xff) + String.fromCharCode((x >> 8) & 0xff) + String.fromCharCode((x >> 16) & 0xff) + String.fromCharCode((x >> 24) & 0xff);
|
||||
this.doc_str += na;
|
||||
break;
|
||||
case 3:
|
||||
this.write_func(this.doc_str);
|
||||
}
|
||||
};
|
||||
clipboard_device.prototype.ioport_readl = function(mem8_loc) {
|
||||
var x;
|
||||
mem8_loc = (mem8_loc >> 2) & 3;
|
||||
switch (mem8_loc) {
|
||||
case 0:
|
||||
this.doc_str = this.read_func();
|
||||
return this.doc_str.length >> 0;
|
||||
case 1:
|
||||
return this.cur_pos >> 0;
|
||||
case 2:
|
||||
x = this.ioport_readb(0);
|
||||
x |= this.ioport_readb(0) << 8;
|
||||
x |= this.ioport_readb(0) << 16;
|
||||
x |= this.ioport_readb(0) << 24;
|
||||
return x;
|
||||
case 3:
|
||||
if (this.get_boot_time)
|
||||
return this.get_boot_time() >> 0;
|
||||
else
|
||||
return 0;
|
||||
}
|
||||
};
|
||||
1035
cpux86-ta.js
1035
cpux86-ta.js
File diff suppressed because it is too large
Load Diff
32
index.html
32
index.html
|
|
@ -28,30 +28,18 @@
|
|||
<body onload="start()">
|
||||
<table border="0">
|
||||
<tr valign="top"><td>
|
||||
|
||||
<script type="text/javascript" src="term.js"></script>
|
||||
<script type="text/javascript">
|
||||
<!--
|
||||
function include(filename)
|
||||
{
|
||||
document.write('<script type="text/javascript" src="' + filename +
|
||||
'"><' + '/script>');
|
||||
}
|
||||
function test_typed_arrays()
|
||||
{
|
||||
return (window.Uint8Array &&
|
||||
window.Uint16Array &&
|
||||
window.Int32Array &&
|
||||
window.ArrayBuffer);
|
||||
}
|
||||
if (test_typed_arrays()) {
|
||||
include("cpux86-ta.js");
|
||||
} else {
|
||||
include("cpux86.js");
|
||||
document.write('<canvas id="dummy_canvas" width="1" height="1"></canvas>');
|
||||
}
|
||||
-->
|
||||
</script>
|
||||
<script type="text/javascript" src="cpux86-ta.js"></script>
|
||||
<script type="text/javascript" src="Serial.js"></script>
|
||||
<script type="text/javascript" src="PIT.js"></script>
|
||||
<script type="text/javascript" src="PIC.js"></script>
|
||||
<script type="text/javascript" src="CMOS.js"></script>
|
||||
<script type="text/javascript" src="KBD.js"></script>
|
||||
<script type="text/javascript" src="clipboard.js"></script>
|
||||
<script type="text/javascript" src="PCEmulator.js"></script>
|
||||
<script type="text/javascript" src="jslinux.js"></script>
|
||||
|
||||
<div id="copyright">© 2011 Fabrice Bellard - <a href="news.html">News</a> - <a href="faq.html">FAQ</a> - <a href="tech.html">Technical notes</a></div>
|
||||
<td><input type="button" value="Clear clipboard" onclick="clear_clipboard();"><br><textarea row="4" cols="16" id="text_clipboard"></textarea>
|
||||
</table>
|
||||
|
|
|
|||
|
|
@ -1,14 +1,14 @@
|
|||
De-obfuscated JSLinux
|
||||
=========================================================
|
||||
|
||||
I wanted to understand how the amazing [JsLinux][1] worked. However, Mr Bellard seems to have applied a decidedly french proclivity towards obfuscatory algorithmic prose, replete with two-letter variable names and the like... ;)
|
||||
I wanted to understand how the amazing [JsLinux][1] worked. However, Mr Bellard seems to have applied a decidedly french proclivity towards obfuscatory algorithmic prose, replete with two-letter variable names and the like... ;) I have no idea if he passed it through a minifier or if the code was generated algorithmically from stuff in the QEMU codebase. In any case, it's hard to follow the action as presented originally, let alone extend it to do new tricks.
|
||||
|
||||
So in order to better understand the code, I started transforming all the symbols and commenting it up, which isn't all that hard a thing to do given that it's been built to imitate a very well-specified piece of hardware.
|
||||
|
||||
### Stats
|
||||
It's still absolutely ungainly, but not nearly so ungainly as the original. About a third to a half of the variables/function names have been redescribed.
|
||||
### Status
|
||||
It's still absolutely ungainly, but not nearly so ungainly as the original. About a third to a half of the variables/function names have been redescribed. The names are basically long comments and will ultimately need to be redone once the whole is understood.
|
||||
|
||||
I highly recommend, by the way, the excellent [JSShaper][2] library for transforming large javascript code bases. The hacks I made from it are in this repo.
|
||||
I highly recommend, by the way, the excellent [JSShaper][2] library for transforming large javascript code bases. The hacks I made from it are in this repo: a little symbol-name-transformer node.js script and an emacs function for doing this in live buffers.
|
||||
|
||||
### Caveat Coder
|
||||
This is an artistic reinterpretation of Fabrice Bellard's original code. There's no alteration in the acutal algorithmic content. I do check that that it still runs. I can't guarantee anything else.
|
||||
|
|
|
|||
Loading…
Reference in New Issue