jslinux/CMOS.js

46 lines
1.4 KiB
JavaScript

/*
Fabrix - An annotated version of the original JSLinux which is Copyright (c) 2011 Fabrice Bellard
Clock Emulator
*/
function formatter(a) { return ((a / 10) << 4) | (a % 10);}
function CMOS(PC) {
var time_array, d;
time_array = new Uint8Array(128);
this.cmos_data = time_array;
this.cmos_index = 0;
d = new Date();
time_array[0] = formatter(d.getUTCSeconds());
time_array[2] = formatter(d.getUTCMinutes());
time_array[4] = formatter(d.getUTCHours());
time_array[6] = formatter(d.getUTCDay());
time_array[7] = formatter(d.getUTCDate());
time_array[8] = formatter(d.getUTCMonth() + 1);
time_array[9] = formatter(d.getUTCFullYear() % 100);
time_array[10] = 0x26;
time_array[11] = 0x02;
time_array[12] = 0x00;
time_array[13] = 0x80;
time_array[0x14] = 0x02;
PC.register_ioport_write(0x70, 2, 1, this.ioport_write.bind(this));
PC.register_ioport_read(0x70, 2, 1, this.ioport_read.bind(this));
}
CMOS.prototype.ioport_write = function(mem8_loc, data) {
if (mem8_loc == 0x70) {
this.cmos_index = data & 0x7f;
}
};
CMOS.prototype.ioport_read = function(mem8_loc) {
var data;
if (mem8_loc == 0x70) {
return 0xff;
} else {
data = this.cmos_data[this.cmos_index];
if (this.cmos_index == 10)
this.cmos_data[10] ^= 0x80;
else if (this.cmos_index == 12)
this.cmos_data[12] = 0x00;
return data;
}
};