Function HDDWriteFIFO

pcsx2/DEV9/DEV9.cpp:233–258

SPEED <-> HDD FIFO

// SPEED <-> HDD FIFO
void HDDWriteFIFO()
{
	pxAssert(dev9.ata->dmaReady && (dev9.if_ctrl & SPD_IF_ATA_DMAEN));
	pxAssert((dev9.if_ctrl & SPD_IF_READ));

	const int unread = (dev9.fifo_bytes_write - dev9.fifo_bytes_read);
	const int space = (SPD_DBUF_AVAIL_MAX * 512 - unread);
	const int base = dev9.fifo_bytes_write % (SPD_DBUF_AVAIL_MAX * 512);

	pxAssert(unread <= SPD_DBUF_AVAIL_MAX * 512);

	int read;
	if (base + space > SPD_DBUF_AVAIL_MAX * 512)
	{
		const int was = SPD_DBUF_AVAIL_MAX * 512 - base;
		read = dev9.ata->ReadDMAToFIFO(dev9.fifo + base, was);
		if (read == was)
			read += dev9.ata->ReadDMAToFIFO(dev9.fifo, space - was);
	}
	else
	{
		read = dev9.ata->ReadDMAToFIFO(dev9.fifo + base, space);
	}

	dev9.fifo_bytes_write += read;
}
void HDDReadFIFO()
{
	pxAssert(dev9.ata->dmaReady && (dev9.if_ctrl & SPD_IF_ATA_DMAEN));