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pic.js
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"use strict";
function PIC_sub(pc_emulator, io_port) {
pc_emulator.register_ioport_write(io_port, 2, 1, this.ioport_write.bind(this));
pc_emulator.register_ioport_read(io_port, 2, 1, this.ioport_read.bind(this));
this.reset();
}
PIC_sub.prototype.log = function () {
};
PIC_sub.prototype.reset = function () {
this.last_irr = 0;
this.irr = 0;
this.imr = 0;
this.isr = 0;
this.priority_add = 0;
this.irq_base = 0;
this.read_reg_select = 0;
this.special_mask = 0;
this.init_state = 0;
this.auto_eoi = 0;
this.rotate_on_autoeoi = 0;
this.init4 = 0;
this.elcr = 0;
this.elcr_mask = 0;
};
PIC_sub.prototype.log = function () {
};
PIC_sub.prototype.set_irq1 = function (Tg, Rf) {
var xc;
xc = 1 << Tg;
if (Rf) {
if ((this.last_irr & xc) == 0) {
this.irr |= xc;
}
this.last_irr |= xc;
} else {
this.last_irr &= ~xc;
}
};
PIC_sub.prototype.get_priority = function (xc) {
var Ug;
if (xc == 0) {
return-1;
}
Ug = 7;
while ((xc & (1 << ((Ug + this.priority_add) & 7))) == 0) {
Ug--;
}
return Ug;
};
PIC_sub.prototype.get_irq = function () {
var xc, priority2, priority1;
xc = this.irr & ~this.imr;
priority1 = this.get_priority(xc);
if (priority1 < 0) {
return -1;
}
priority2 = this.get_priority(this.isr);
if (priority1 > priority2) {
return priority1;
} else {
return -1;
}
};
PIC_sub.prototype.intack = function (Tg) {
if (this.auto_eoi) {
if (this.rotate_on_auto_eoi) {
this.priority_add = (Tg + 1) & 7;
}
} else {
this.isr |= (1 << Tg);
}
if (!(this.elcr & (1 << Tg))) {
this.irr &= ~(1 << Tg);
}
};
PIC_sub.prototype.ioport_write = function (io_port, byte_value) {
var Ug;
io_port &= 1;
if (io_port == 0) {
if (byte_value & 0x10) {
this.reset();
this.init_state = 1;
this.init4 = byte_value & 1;
if (byte_value & 0x02) {
throw "single mode not supported";
}
if (byte_value & 0x08) {
throw "level sensitive irq not supported";
}
} else if (byte_value & 0x08) {
if (byte_value & 0x02) {
this.read_reg_select = byte_value & 1;
}
if (byte_value & 0x40) {
this.special_mask = (byte_value >> 5) & 1;
}
} else {
switch (byte_value) {
case 0x00:
case 0x80:
this.rotate_on_autoeoi = byte_value >> 7;
break;
case 0x20:
case 0xa0:
Ug = this.get_priority(this.isr);
if (Ug >= 0) {
this.isr &= ~(1 << ((Ug + this.priority_add) & 7));
}
if (byte_value == 0xa0) {
this.priority_add = (this.priority_add + 1) & 7;
}
break;
case 0x60:
case 0x61:
case 0x62:
case 0x63:
case 0x64:
case 0x65:
case 0x66:
case 0x67:
Ug = byte_value & 7;
this.isr &= ~(1 << Ug);
break;
case 0xc0:
case 0xc1:
case 0xc2:
case 0xc3:
case 0xc4:
case 0xc5:
case 0xc6:
case 0xc7:
this.priority_add = (byte_value + 1) & 7;
break;
case 0xe0:
case 0xe1:
case 0xe2:
case 0xe3:
case 0xe4:
case 0xe5:
case 0xe6:
case 0xe7:
Ug = byte_value & 7;
this.isr &= ~(1 << Ug);
this.priority_add = (Ug + 1) & 7;
break;
}
}
} else {
switch (this.init_state) {
case 0:
this.imr = byte_value;
this.update_irq();
break;
case 1:
this.irq_base = byte_value & 0xf8;
this.init_state = 2;
break;
case 2:
if (this.init4) {
this.init_state = 3;
} else {
this.init_state = 0;
}
break;
case 3:
this.auto_eoi = (byte_value >> 1) & 1;
this.init_state = 0;
break;
}
}
};
PIC_sub.prototype.ioport_read = function (io_port) {
var ia, retval;
ia = io_port & 1;
if (ia == 0) {
if (this.read_reg_select) {
retval = this.isr;
} else {
retval = this.irr;
}
} else {
retval = this.imr;
}
return retval;
};
function PIC(pc_emulator, pic1_port, pic2_port, cpu_set_irq) {
var me = this;
var logger = function () {
me.log.apply(me, arguments);
};
this.pics = [];
this.pics[0] = new PIC_sub(pc_emulator, pic1_port);
this.pics[0].log = logger;
this.pics[1] = new PIC_sub(pc_emulator, pic2_port);
this.pics[1].log = logger;
this.pics[0].elcr_mask = 0xf8;
this.pics[1].elcr_mask = 0xde;
this.irq_requested = 0;
this.cpu_set_irq = cpu_set_irq;
this.pics[0].update_irq = this.update_irq.bind(this);
this.pics[1].update_irq = this.update_irq.bind(this);
}
PIC.prototype.log = function () {
};
PIC.prototype.update_irq = function () {
var priority1, priority2;
priority1 = this.pics[1].get_irq();
if (priority1 >= 0) {
this.pics[0].set_irq1(2, 1);
this.pics[0].set_irq1(2, 0);
}
priority2 = this.pics[0].get_irq();
if (priority2 >= 0) {
this.cpu_set_irq(1);
} else {
this.cpu_set_irq(0);
}
};
PIC.prototype.set_irq = function (Tg, Rf) {
this.pics[Tg >> 3].set_irq1(Tg & 7, Rf);
this.update_irq();
};
PIC.prototype.get_hard_intno = function () {
var priority1, priority2, intno;
priority1 = this.pics[0].get_irq();
if (priority1 >= 0) {
this.pics[0].intack(priority1);
if (priority1 == 2) {
priority2 = this.pics[1].get_irq();
if (priority2 >= 0) {
this.pics[1].intack(priority2);
} else {
priority2 = 7;
}
intno = this.pics[1].irq_base + priority2;
priority1 = priority2 + 8;
} else {
intno = this.pics[0].irq_base + priority1;
}
} else {
priority1 = 7;
intno = this.pics[0].irq_base + priority1;
}
this.update_irq();
return intno;
};
self.PIC = PIC;