32Bit:Floppy Driver: Reading: No Interupt fired + Qemu Error

[LegendDairy]

Hi,
I was working on my floppy driver this week, and I managed to reinitialize the floppy drive, so I tried working on a function that would read a sector and I follow the steps from the wiki, and made a prototype function, but this one does not work great: On Bochs, I don't get an error, I just don't receive an interrupt. On Qemu I get an error: "FLOPPY ERROR: fdctrl_start_transfer: dma_mode=2 direction=1". I think I didn't do something I was supposed to do with my ISA DMA code, but I don't know what because I can't find a good explanation on how to program the DMA.

Here's my code:

Code: Select all

void setup_dma2(void)

{
	dissable();			// Dissable interupts

	outb(0x0A, 0x06);		// Mask DMA channel 2.

	outb(0x0C, 0xFF);		// Reset the master flip-flop.

	outb(0x04, 0x00);		// Address to 0x1000 (low byte).

	outb(0x04, 0x10);		// Address to 0x1000 (high byte).

	outb(0x0C, 0xFF);		// Reset the master flip-flop (send any value).

	outb(0x05, 0xFF);		// Count to 0x23ff (low byte).

	outb(0x05, 0x23);		// Count to 0x23ff (high byte),

	outb(0x81, 0x00);		// External page register to 0 for total address of 00 10 00

    	outb(0x0a, 0x01);		// Unmask DMA channel 2
	enable();			// Enable interupts.

}
void setup_dma2_read(void)

{

	outb(0x0A, 0x06);		// Mask DMA channel 2.

	outb(0x0B, 0x5A);		// 01 0 1 10 10

							// Single transfer, address increment, autoinit, read, channel2

	outb(0x0a, 0x01);		// Unmask DMA channel 2

}

Floppy:

Code: Select all

void ReadFloppy(u8int drive, u8int head, u8int cyl, u8int sect, u8int n)

{
	outb(DOR, 0x1C);

	delay(500);
	setup_dma2_read();

	ReceivedIRQ = 0;

	outb(DATA_FIFO, 0x80 | 0x40 | 0x6);

	outb(DATA_FIFO, (( head << 2) | drive));

	outb(DATA_FIFO, cyl);

	outb(DATA_FIFO, head);

	outb(DATA_FIFO, sect);

	outb(DATA_FIFO, 0x02);

	outb(DATA_FIFO, n);

	outb(DATA_FIFO, 0x1b);

	outb(DATA_FIFO, 0xff);

	int i = 0;

	for(i=0; i < 7; i++)

	{

	printf("\nWaiting for result byte %d...", i);

	while(!(inb(MSR) & (0x1 << 7)));

	printf("0x%x	Done.", inb(DATA_FIFO));

	}



	printf("\n Waiting for IRQ...");

	FloppyWaitIRQ();

	printf("	Done.");

}

[Yashas]

Have you installed the interrupt to your system.

Also sometimes Virtual Machines are not accurate.My Cpu Speaker was not working in QWMu but when i booted it on my computer it worked.