147 lines
3.6 KiB
JavaScript
147 lines
3.6 KiB
JavaScript
/*
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JSLinux-deobfuscated - An annotated version of the original JSLinux.
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Original is Copyright (c) 2011-2012 Fabrice Bellard
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Redistribution or commercial use is prohibited without the author's permission.
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Serial Controller Emulator
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*/
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function Serial(Ng, mem8_loc, kh, lh) {
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this.divider = 0;
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this.rbr = 0;
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this.ier = 0;
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this.iir = 0x01;
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this.lcr = 0;
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this.mcr;
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this.lsr = 0x40 | 0x20;
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this.msr = 0;
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this.scr = 0;
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this.set_irq_func = kh;
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this.write_func = lh;
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this.receive_fifo = "";
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Ng.register_ioport_write(0x3f8, 8, 1, this.ioport_write.bind(this));
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Ng.register_ioport_read(0x3f8, 8, 1, this.ioport_read.bind(this));
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}
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Serial.prototype.update_irq = function() {
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if ((this.lsr & 0x01) && (this.ier & 0x01)) {
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this.iir = 0x04;
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} else if ((this.lsr & 0x20) && (this.ier & 0x02)) {
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this.iir = 0x02;
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} else {
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this.iir = 0x01;
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}
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if (this.iir != 0x01) {
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this.set_irq_func(1);
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} else {
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this.set_irq_func(0);
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}
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};
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Serial.prototype.ioport_write = function(mem8_loc, x) {
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mem8_loc &= 7;
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switch (mem8_loc) {
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default:
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case 0:
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if (this.lcr & 0x80) {
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this.divider = (this.divider & 0xff00) | x;
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} else {
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this.lsr &= ~0x20;
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this.update_irq();
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this.write_func(String.fromCharCode(x));
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this.lsr |= 0x20;
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this.lsr |= 0x40;
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this.update_irq();
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}
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break;
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case 1:
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if (this.lcr & 0x80) {
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this.divider = (this.divider & 0x00ff) | (x << 8);
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} else {
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this.ier = x;
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this.update_irq();
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}
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break;
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case 2:
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break;
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case 3:
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this.lcr = x;
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break;
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case 4:
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this.mcr = x;
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break;
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case 5:
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break;
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case 6:
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this.msr = x;
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break;
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case 7:
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this.scr = x;
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break;
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}
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};
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Serial.prototype.ioport_read = function(mem8_loc) {
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var Pg;
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mem8_loc &= 7;
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switch (mem8_loc) {
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default:
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case 0:
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if (this.lcr & 0x80) {
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Pg = this.divider & 0xff;
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} else {
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Pg = this.rbr;
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this.lsr &= ~(0x01 | 0x10);
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this.update_irq();
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this.send_char_from_fifo();
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}
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break;
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case 1:
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if (this.lcr & 0x80) {
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Pg = (this.divider >> 8) & 0xff;
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} else {
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Pg = this.ier;
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}
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break;
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case 2:
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Pg = this.iir;
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break;
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case 3:
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Pg = this.lcr;
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break;
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case 4:
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Pg = this.mcr;
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break;
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case 5:
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Pg = this.lsr;
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break;
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case 6:
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Pg = this.msr;
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break;
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case 7:
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Pg = this.scr;
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break;
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}
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return Pg;
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};
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Serial.prototype.send_break = function() {
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this.rbr = 0;
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this.lsr |= 0x10 | 0x01;
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this.update_irq();
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};
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Serial.prototype.send_char = function(mh) {
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this.rbr = mh;
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this.lsr |= 0x01;
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this.update_irq();
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};
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Serial.prototype.send_char_from_fifo = function() {
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var nh;
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nh = this.receive_fifo;
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if (nh != "" && !(this.lsr & 0x01)) {
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this.send_char(nh.charCodeAt(0));
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this.receive_fifo = nh.substr(1, nh.length - 1);
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}
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};
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Serial.prototype.send_chars = function(na) {
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this.receive_fifo += na;
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this.send_char_from_fifo();
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};
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