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ne2k.js
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ne2k.js
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"use strict";
// http://www.ethernut.de/pdf/8019asds.pdf
const NE2K_LOG_VERBOSE = false;
/** @const */ var E8390_CMD = 0x00; /* The command register (for all pages) */
/* Page 0 register offsets. */
/** @const */ var EN0_CLDALO = 0x01; /* Low byte of current local dma addr RD */
/** @const */ var EN0_STARTPG = 0x01; /* Starting page of ring bfr WR */
/** @const */ var EN0_CLDAHI = 0x02; /* High byte of current local dma addr RD */
/** @const */ var EN0_STOPPG = 0x02; /* Ending page +1 of ring bfr WR */
/** @const */ var EN0_BOUNDARY = 0x03; /* Boundary page of ring bfr RD WR */
/** @const */ var EN0_TSR = 0x04; /* Transmit status reg RD */
/** @const */ var EN0_TPSR = 0x04; /* Transmit starting page WR */
/** @const */ var EN0_NCR = 0x05; /* Number of collision reg RD */
/** @const */ var EN0_TCNTLO = 0x05; /* Low byte of tx byte count WR */
/** @const */ var EN0_FIFO = 0x06; /* FIFO RD */
/** @const */ var EN0_TCNTHI = 0x06; /* High byte of tx byte count WR */
/** @const */ var EN0_ISR = 0x07; /* Interrupt status reg RD WR */
/** @const */ var EN0_CRDALO = 0x08; /* low byte of current remote dma address RD */
/** @const */ var EN0_RSARLO = 0x08; /* Remote start address reg 0 */
/** @const */ var EN0_CRDAHI = 0x09; /* high byte, current remote dma address RD */
/** @const */ var EN0_RSARHI = 0x09; /* Remote start address reg 1 */
/** @const */ var EN0_RCNTLO = 0x0a; /* Remote byte count reg WR */
/** @const */ var EN0_RCNTHI = 0x0b; /* Remote byte count reg WR */
/** @const */ var EN0_RSR = 0x0c; /* rx status reg RD */
/** @const */ var EN0_RXCR = 0x0c; /* RX configuration reg WR */
/** @const */ var EN0_TXCR = 0x0d; /* TX configuration reg WR */
/** @const */ var EN0_COUNTER0 = 0x0d; /* Rcv alignment error counter RD */
/** @const */ var EN0_DCFG = 0x0e; /* Data configuration reg WR */
/** @const */ var EN0_COUNTER1 = 0x0e; /* Rcv CRC error counter RD */
/** @const */ var EN0_IMR = 0x0f; /* Interrupt mask reg WR */
/** @const */ var EN0_COUNTER2 = 0x0f; /* Rcv missed frame error counter RD */
/** @const */ var NE_DATAPORT = 0x10; /* NatSemi-defined port window offset. */
/** @const */ var NE_RESET = 0x1f; /* Issue a read to reset, a write to clear. */
/* Bits in EN0_ISR - Interrupt status register */
/** @const */ var ENISR_RX = 0x01; /* Receiver, no error */
/** @const */ var ENISR_TX = 0x02; /* Transmitter, no error */
/** @const */ var ENISR_RX_ERR = 0x04; /* Receiver, with error */
/** @const */ var ENISR_TX_ERR = 0x08; /* Transmitter, with error */
/** @const */ var ENISR_OVER = 0x10; /* Receiver overwrote the ring */
/** @const */ var ENISR_COUNTERS = 0x20; /* Counters need emptying */
/** @const */ var ENISR_RDC = 0x40; /* remote dma complete */
/** @const */ var ENISR_RESET = 0x80; /* Reset completed */
/** @const */ var ENISR_ALL = 0x3f; /* Interrupts we will enable */
/** @const */ var ENRSR_RXOK = 0x01; /* Received a good packet */
/** @const */ var START_PAGE = 0x40;
/** @const */ var START_RX_PAGE = 0x40 + 12;
/** @const */ var STOP_PAGE = 0x80;
/**
* @constructor
* @param {CPU} cpu
* @param {BusConnector} bus
* @param {Boolean} preserve_mac_from_state_image
*/
function Ne2k(cpu, bus, preserve_mac_from_state_image)
{
/** @const @type {CPU} */
this.cpu = cpu;
/** @const @type {PCI} */
this.pci = cpu.devices.pci;
this.preserve_mac_from_state_image = preserve_mac_from_state_image;
/** @const @type {BusConnector} */
this.bus = bus;
this.bus.register("net0-receive", function(data)
{
this.receive(data);
}, this);
this.port = 0x300;
this.name = "ne2k";
/** @const */
var use_pci = true;
if(use_pci)
{
this.pci_space = [
0xec, 0x10, 0x29, 0x80, 0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00,
this.port & 0xFF | 1, this.port >> 8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf4, 0x1a, 0x00, 0x11,
0x00, 0x00, 0xb8, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
];
this.pci_id = 0x05 << 3;
this.pci_bars = [
{
size: 32,
},
];
}
this.isr = 0;
this.imr = 0; // interrupt mask register
this.cr = 1;
this.dcfg = 0;
this.rcnt = 0;
this.tcnt = 0;
this.tpsr = 0;
this.memory = new Uint8Array(256 * 0x80);
this.rxcr = 0;
this.txcr = 0;
this.tsr = 1;
// mac address
this.mac = new Uint8Array([
0x00, 0x22, 0x15,
Math.random() * 255 | 0,
Math.random() * 255 | 0,
Math.random() * 255 | 0,
]);
for(var i = 0; i < 6; i++)
{
this.memory[i << 1] = this.memory[i << 1 | 1] = this.mac[i];
}
// the PROM signature of 0x57, 0x57 is also doubled
// resulting in setting the 4 bytes at the end, 28, 29, 30 and 31 to 0x57
this.memory[14 << 1] = this.memory[14 << 1 | 1] = 0x57;
this.memory[15 << 1] = this.memory[15 << 1 | 1] = 0x57;
dbg_log("Mac: " + h(this.mac[0], 2) + ":" +
h(this.mac[1], 2) + ":" +
h(this.mac[2], 2) + ":" +
h(this.mac[3], 2) + ":" +
h(this.mac[4], 2) + ":" +
h(this.mac[5], 2), LOG_NET);
this.rsar = 0;
this.pstart = START_PAGE;
this.pstop = STOP_PAGE;
this.curpg = START_RX_PAGE;
this.boundary = START_RX_PAGE;
var io = cpu.io;
io.register_read(this.port | E8390_CMD, this, function()
{
dbg_log("Read cmd", LOG_NET);
return this.cr;
});
io.register_write(this.port | E8390_CMD, this, function(data_byte)
{
this.cr = data_byte;
dbg_log("Write command: " + h(data_byte, 2) + " newpg=" + (this.cr >> 6) + " txcr=" + h(this.txcr, 2), LOG_NET);
if(this.cr & 1)
{
return;
}
if((data_byte & 0x18) && this.rcnt === 0)
{
this.do_interrupt(ENISR_RDC);
}
if(data_byte & 4)
{
var start = this.tpsr << 8;
var data = this.memory.subarray(start, start + this.tcnt);
this.bus.send("net0-send", data);
this.bus.send("eth-transmit-end", [data.length]);
this.cr &= ~4;
this.do_interrupt(ENISR_TX);
dbg_log("Command: Transfer. length=" + h(data.byteLength), LOG_NET);
}
});
io.register_read(this.port | EN0_COUNTER0, this, function()
{
dbg_log("Read counter0", LOG_NET);
return 0;
});
io.register_read(this.port | EN0_COUNTER1, this, function()
{
dbg_log("Read counter1", LOG_NET);
return 0;
});
io.register_read(this.port | EN0_COUNTER2, this, function()
{
dbg_log("Read counter2", LOG_NET);
return 0;
});
io.register_read(this.port | NE_RESET, this, function()
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Read reset", LOG_NET);
this.do_interrupt(ENISR_RESET);
}
else
{
dbg_log("Read pg" + pg + "/1f", LOG_NET);
dbg_assert(false);
}
return 0;
});
io.register_write(this.port | NE_RESET, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Write reset: " + h(data_byte, 2), LOG_NET);
//this.isr &= ~ENISR_RESET;
}
else
{
dbg_log("Write pg" + pg + "/1f: " + h(data_byte), LOG_NET);
dbg_assert(false);
}
});
io.register_read(this.port | EN0_STARTPG, this, function()
{
var pg = this.get_page();
if(pg === 0)
{
return this.pstart;
}
else if(pg === 1)
{
dbg_log("Read pg1/01 (mac[0])", LOG_NET);
return this.mac[0];
}
else if(pg === 2)
{
return this.pstart;
}
else
{
dbg_log("Read pg" + pg + "/01");
dbg_assert(false);
return 0;
}
});
io.register_write(this.port | EN0_STARTPG, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("start page: " + h(data_byte, 2), LOG_NET);
this.pstart = data_byte;
}
else if(pg === 1)
{
dbg_log("mac[0] = " + h(data_byte), LOG_NET);
this.mac[0] = data_byte;
}
else if(pg === 3)
{
dbg_log("Unimplemented: Write pg3/01 (9346CR): " + h(data_byte), LOG_NET);
}
else
{
dbg_log("Write pg" + pg + "/01: " + h(data_byte), LOG_NET);
dbg_assert(false);
}
});
io.register_read(this.port | EN0_STOPPG, this, function()
{
var pg = this.get_page();
if(pg === 0)
{
return this.pstop;
}
else if(pg === 1)
{
dbg_log("Read pg1/02 (mac[1])", LOG_NET);
return this.mac[1];
}
else if(pg === 2)
{
return this.pstop;
}
else
{
dbg_log("Read pg" + pg + "/02", LOG_NET);
dbg_assert(false);
return 0;
}
});
io.register_write(this.port | EN0_STOPPG, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("stop page: " + h(data_byte, 2), LOG_NET);
if(data_byte > (this.memory.length >> 8))
{
data_byte = this.memory.length >> 8;
dbg_log("XXX: Adjusting stop page to " + h(data_byte), LOG_NET);
}
this.pstop = data_byte;
}
else if(pg === 1)
{
dbg_log("mac[1] = " + h(data_byte), LOG_NET);
this.mac[1] = data_byte;
}
else
{
dbg_log("Write pg" + pg + "/02: " + h(data_byte), LOG_NET);
dbg_assert(false);
}
});
io.register_read(this.port | EN0_ISR, this, function()
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Read isr: " + h(this.isr, 2), LOG_NET);
return this.isr;
}
else if(pg === 1)
{
dbg_log("Read curpg: " + h(this.curpg, 2), LOG_NET);
return this.curpg;
}
else
{
dbg_assert(false);
}
});
io.register_write(this.port | EN0_ISR, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
// acknowledge interrupts where bit is set
dbg_log("Write isr: " + h(data_byte, 2), LOG_NET);
this.isr &= ~data_byte;
this.update_irq();
}
else if(pg === 1)
{
dbg_log("Write curpg: " + h(data_byte, 2), LOG_NET);
this.curpg = data_byte;
}
else
{
dbg_assert(false);
}
});
io.register_write(this.port | EN0_TXCR, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
this.txcr = data_byte;
dbg_log("Write tx config: " + h(data_byte, 2), LOG_NET);
}
else
{
dbg_log("Unimplemented: Write pg" + pg + "/0d " + h(data_byte, 2), LOG_NET);
}
});
io.register_write(this.port | EN0_DCFG, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Write data configuration: " + h(data_byte, 2), LOG_NET);
this.dcfg = data_byte;
}
else
{
dbg_log("Unimplemented: Write pg" + pg + "/0e " + h(data_byte, 2), LOG_NET);
}
});
io.register_read(this.port | EN0_RCNTLO, this, function()
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Read pg0/0a", LOG_NET);
return 0x50;
}
else
{
dbg_assert(false, "TODO");
return 0;
}
});
io.register_write(this.port | EN0_RCNTLO, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Write remote byte count low: " + h(data_byte, 2), LOG_NET);
this.rcnt = this.rcnt & 0xFF00 | data_byte & 0xFF;
}
else
{
dbg_log("Unimplemented: Write pg" + pg + "/0a " + h(data_byte, 2), LOG_NET);
}
});
io.register_read(this.port | EN0_RCNTHI, this, function()
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Read pg0/0b", LOG_NET);
return 0x43;
}
else
{
dbg_assert(false, "TODO");
return 0;
}
});
io.register_write(this.port | EN0_RCNTHI, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Write remote byte count high: " + h(data_byte, 2), LOG_NET);
this.rcnt = this.rcnt & 0xFF | data_byte << 8 & 0xFF00;
}
else
{
dbg_log("Unimplemented: Write pg" + pg + "/0b " + h(data_byte, 2), LOG_NET);
}
});
io.register_read(this.port | EN0_RSARLO, this, function()
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Read remote start address low", LOG_NET);
return this.rsar & 0xFF;
}
else
{
dbg_log("Unimplemented: Read pg" + pg + "/08", LOG_NET);
dbg_assert(false);
}
});
io.register_write(this.port | EN0_RSARLO, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Write remote start address low: " + h(data_byte, 2), LOG_NET);
this.rsar = this.rsar & 0xFF00 | data_byte & 0xFF;
}
else
{
dbg_log("Unimplemented: Write pg" + pg + "/08 " + h(data_byte, 2), LOG_NET);
}
});
io.register_read(this.port | EN0_RSARHI, this, function()
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Read remote start address high", LOG_NET);
return this.rsar >> 8 & 0xFF;
}
else
{
dbg_log("Unimplemented: Read pg" + pg + "/09", LOG_NET);
dbg_assert(false);
}
});
io.register_write(this.port | EN0_RSARHI, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Write remote start address low: " + h(data_byte, 2), LOG_NET);
this.rsar = this.rsar & 0xFF | data_byte << 8 & 0xFF00;
}
else
{
dbg_log("Unimplemented: Write pg" + pg + "/09 " + h(data_byte, 2), LOG_NET);
}
});
io.register_write(this.port | EN0_IMR, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Write interrupt mask register: " + h(data_byte, 2) + " isr=" + h(this.isr, 2), LOG_NET);
this.imr = data_byte;
this.update_irq();
}
else
{
dbg_log("Unimplemented: Write pg" + pg + "/0f " + h(data_byte, 2), LOG_NET);
}
});
io.register_read(this.port | EN0_BOUNDARY, this, function()
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Read boundary: " + h(this.boundary, 2), LOG_NET);
return this.boundary;
}
else if(pg === 1)
{
dbg_log("Read pg1/03 (mac[2])", LOG_NET);
return this.mac[2];
}
else if(pg === 3)
{
dbg_log("Unimplemented: Read pg3/03 (CONFIG0)", LOG_NET);
return 0;
}
else
{
dbg_log("Read pg" + pg + "/03", LOG_NET);
dbg_assert(false);
return 0;
}
});
io.register_write(this.port | EN0_BOUNDARY, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Write boundary: " + h(data_byte, 2), LOG_NET);
this.boundary = data_byte;
}
else if(pg === 1)
{
dbg_log("mac[2] = " + h(data_byte), LOG_NET);
this.mac[2] = data_byte;
}
else
{
dbg_log("Write pg" + pg + "/03: " + h(data_byte), LOG_NET);
dbg_assert(false);
}
});
io.register_read(this.port | EN0_TSR, this, function()
{
var pg = this.get_page();
if(pg === 0)
{
return this.tsr;
}
else if(pg === 1)
{
dbg_log("Read pg1/04 (mac[3])", LOG_NET);
return this.mac[3];
}
else
{
dbg_log("Read pg" + pg + "/04", LOG_NET);
dbg_assert(false);
return 0;
}
});
io.register_write(this.port | EN0_TPSR, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Write tpsr: " + h(data_byte, 2), LOG_NET);
this.tpsr = data_byte;
}
else if(pg === 1)
{
dbg_log("mac[3] = " + h(data_byte), LOG_NET);
this.mac[3] = data_byte;
}
else
{
dbg_log("Write pg" + pg + "/04: " + h(data_byte), LOG_NET);
dbg_assert(false);
}
});
io.register_read(this.port | EN0_TCNTLO, this, function()
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Unimplemented: Read pg0/05 (NCR: Number of Collisions Register)", LOG_NET);
return 0;
}
else if(pg === 1)
{
dbg_log("Read pg1/05 (mac[4])", LOG_NET);
return this.mac[4];
}
else if(pg === 3)
{
dbg_log("Unimplemented: Read pg3/05 (CONFIG2)", LOG_NET);
return 0;
}
else
{
dbg_log("Read pg" + pg + "/05", LOG_NET);
dbg_assert(false);
return 0;
}
});
io.register_write(this.port | EN0_TCNTLO, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Write tcnt low: " + h(data_byte, 2), LOG_NET);
this.tcnt = this.tcnt & ~0xFF | data_byte;
}
else if(pg === 1)
{
dbg_log("mac[4] = " + h(data_byte), LOG_NET);
this.mac[4] = data_byte;
}
else if(pg === 3)
{
dbg_log("Unimplemented: Write pg3/05 (CONFIG2): " + h(data_byte), LOG_NET);
}
else
{
dbg_log("Write pg" + pg + "/05: " + h(data_byte), LOG_NET);
dbg_assert(false);
}
});
io.register_read(this.port | EN0_TCNTHI, this, function()
{
var pg = this.get_page();
if(pg === 0)
{
dbg_assert(false, "TODO");
return 0;
}
else if(pg === 1)
{
dbg_log("Read pg1/06 (mac[5])", LOG_NET);
return this.mac[5];
}
else if(pg === 3)
{
dbg_log("Unimplemented: Read pg3/06 (CONFIG3)", LOG_NET);
return 0;
}
else
{
dbg_log("Read pg" + pg + "/06", LOG_NET);
dbg_assert(false);
return 0;
}
});
io.register_write(this.port | EN0_TCNTHI, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("Write tcnt high: " + h(data_byte, 2), LOG_NET);
this.tcnt = this.tcnt & 0xFF | data_byte << 8;
}
else if(pg === 1)
{
dbg_log("mac[5] = " + h(data_byte), LOG_NET);
this.mac[5] = data_byte;
}
else if(pg === 3)
{
dbg_log("Unimplemented: Write pg3/06 (CONFIG3): " + h(data_byte), LOG_NET);
}
else
{
dbg_log("Write pg" + pg + "/06: " + h(data_byte), LOG_NET);
dbg_assert(false);
}
});
io.register_read(this.port | EN0_RSR, this, function()
{
var pg = this.get_page();
if(pg === 0)
{
return 1 | 1 << 3; // receive status ok
}
else
{
dbg_log("Unimplemented: Read pg" + pg + "/0c", LOG_NET);
dbg_assert(false);
return 0;
}
});
io.register_write(this.port | EN0_RXCR, this, function(data_byte)
{
var pg = this.get_page();
if(pg === 0)
{
dbg_log("RX configuration reg write: " + h(data_byte, 2), LOG_NET);
this.rxcr = data_byte;
}
else
{
dbg_log("Unimplemented: Write pg" + pg + "/0c: " + h(data_byte), LOG_NET);
}
});
io.register_read(this.port | NE_DATAPORT | 0, this,
this.data_port_read8,
this.data_port_read16,
this.data_port_read32);
io.register_write(this.port | NE_DATAPORT | 0, this,
this.data_port_write16,
this.data_port_write16,
this.data_port_write32);
if(use_pci)
{
cpu.devices.pci.register_device(this);
}
}
Ne2k.prototype.get_state = function()
{
var state = [];
state[0] = this.isr;
state[1] = this.imr;
state[2] = this.cr;
state[3] = this.dcfg;
state[4] = this.rcnt;
state[5] = this.tcnt;
state[6] = this.tpsr;
state[7] = this.rsar;
state[8] = this.pstart;
state[9] = this.curpg;
state[10] = this.boundary;
state[11] = this.pstop;
state[12] = this.rxcr;
state[13] = this.txcr;
state[14] = this.tsr;
state[15] = this.mac;
state[16] = this.memory;
return state;
};
Ne2k.prototype.set_state = function(state)
{
this.isr = state[0];
this.imr = state[1];
this.cr = state[2];
this.dcfg = state[3];
this.rcnt = state[4];
this.tcnt = state[5];
this.tpsr = state[6];
this.rsar = state[7];
this.pstart = state[8];
this.curpg = state[9];
this.boundary = state[10];
this.pstop = state[11];
this.rxcr = state[12];
this.txcr = state[13];
this.tsr = state[14];
if(this.preserve_mac_from_state_image)
{
this.mac = state[15];
this.memory = state[16];
}
};
Ne2k.prototype.do_interrupt = function(ir_mask)
{
dbg_log("Do interrupt " + h(ir_mask, 2), LOG_NET);
this.isr |= ir_mask;
this.update_irq();
};
Ne2k.prototype.update_irq = function()
{
if(this.imr & this.isr)
{
this.pci.raise_irq(this.pci_id);
}
else
{
this.pci.lower_irq(this.pci_id);
}
};
Ne2k.prototype.data_port_write = function(data_byte)
{
if(NE2K_LOG_VERBOSE)
{
dbg_log("Write data port: data=" + h(data_byte & 0xFF, 2) +
" rsar=" + h(this.rsar, 4) +
" rcnt=" + h(this.rcnt, 4), LOG_NET);
}
if(this.rsar <= 0x10 || this.rsar >= (START_PAGE << 8) && this.rsar < (STOP_PAGE << 8))
{
this.memory[this.rsar] = data_byte;
}
this.rsar++;
this.rcnt--;
if(this.rsar >= (this.pstop << 8))
{
this.rsar += (this.pstart - this.pstop) << 8;
}
if(this.rcnt === 0)
{
this.do_interrupt(ENISR_RDC);
}
};
Ne2k.prototype.data_port_write16 = function(data)
{
this.data_port_write(data);
if(this.dcfg & 1)
{
this.data_port_write(data >> 8);
}
};
Ne2k.prototype.data_port_write32 = function(data)
{
this.data_port_write(data);
this.data_port_write(data >> 8);
this.data_port_write(data >> 16);
this.data_port_write(data >> 24);
};
Ne2k.prototype.data_port_read = function()
{
let data = 0;
if(this.rsar < (STOP_PAGE << 8))
{
data = this.memory[this.rsar];
}
if(NE2K_LOG_VERBOSE)
{
dbg_log("Read data port: data=" + h(data, 2) +
" rsar=" + h(this.rsar, 4) +
" rcnt=" + h(this.rcnt, 4), LOG_NET);
}
this.rsar++;
this.rcnt--;
if(this.rsar >= (this.pstop << 8))
{
this.rsar += (this.pstart - this.pstop) << 8;
}
if(this.rcnt === 0)
{
this.do_interrupt(ENISR_RDC);
}
return data;
};
Ne2k.prototype.data_port_read8 = function()
{
return this.data_port_read16() & 0xFF;
};
Ne2k.prototype.data_port_read16 = function()
{
if(this.dcfg & 1)
{
return this.data_port_read() | this.data_port_read() << 8;
}
else
{
return this.data_port_read();
}
};
Ne2k.prototype.data_port_read32 = function()
{
return this.data_port_read() | this.data_port_read() << 8 |
this.data_port_read() << 16 | this.data_port_read() << 24;
};
Ne2k.prototype.receive = function(data)
{
// called from the adapter when data is received over the network
if(this.cr & 1)
{
// stop bit set
return;
}
this.bus.send("eth-receive-end", [data.length]);
if(this.rxcr & 0x10)
{
// promiscuous
}
else if((this.rxcr & 4) &&
data[0] === 0xFF && data[1] === 0xFF && data[2] === 0xFF &&
data[3] === 0xFF && data[4] === 0xFF && data[5] === 0xFF)
{
// broadcast
}
else if((this.rxcr & 8) && (data[0] & 1) === 1)
{
// multicast
// XXX
return;
}
else if(data[0] === this.mac[0] && data[1] === this.mac[1] &&
data[2] === this.mac[2] && data[3] === this.mac[3] &&
data[4] === this.mac[4] && data[5] === this.mac[5])
{
}
else
{
return;
}
var packet_length = Math.max(60, data.length);
var offset = this.curpg << 8;
var total_length = packet_length + 4;
var data_start = offset + 4;
var next = this.curpg + 1 + (total_length >> 8);
var end = offset + total_length;
const needed = 1 + (total_length >> 8);
// boundary == curpg interpreted as ringbuffer empty
const available = this.boundary > this.curpg ?
this.boundary - this.curpg :
this.pstop - this.curpg + this.boundary - this.pstart;
if(available < needed &&
this.boundary !== 0 // XXX: ReactOS sets this to 0 initially and never updates it unless it receives a packet
)
{
dbg_log("Buffer full, dropping packet pstart=" + h(this.pstart) + " pstop=" + h(this.pstop) +
" curpg=" + h(this.curpg) + " needed=" + h(needed) + " boundary=" + h(this.boundary) + " available=" + h(available), LOG_NET);
return;
}
if(end > (this.pstop << 8))
{