Exemple #1
0
//! Initialize pic
void i86_pic_initialize (uint8_t base0, uint8_t base1) {

	uint8_t		icw	= 0;

	//! disable hardware interrupts
	disable ();

	//! Begin initialization of PIC

	icw = (icw & ~I86_PIC_ICW1_MASK_INIT) | I86_PIC_ICW1_INIT_YES;
	icw = (icw & ~I86_PIC_ICW1_MASK_IC4) | I86_PIC_ICW1_IC4_EXPECT;

	i86_pic_send_command (icw, 0);
	i86_pic_send_command (icw, 1);

	//! Send initialization control word 2. This is the base addresses of the irq's

	i86_pic_send_data (base0, 0);
	i86_pic_send_data (base1, 1);

	//! Send initialization control word 3. This is the connection between master and slave.
	//! ICW3 for master PIC is the IR that connects to secondary pic in binary format
	//! ICW3 for secondary PIC is the IR that connects to master pic in decimal format

	i86_pic_send_data (0x04, 0);
	i86_pic_send_data (0x02, 1);

	//! Send Initialization control word 4. Enables i86 mode

	icw = (icw & ~I86_PIC_ICW4_MASK_UPM) | I86_PIC_ICW4_UPM_86MODE;

	i86_pic_send_data (icw, 0);
	i86_pic_send_data (icw, 1);
}
Exemple #2
0
//! notifies hal interrupt is done
void InterruptDone(unsigned int intno) {

	//! insure its a valid hardware irq
	if (intno > 16)
		return;

	//! test if we need to send end-of-interrupt to second pic
	if (intno >= 8)
		i86_pic_send_command(I86_PIC_OCW2_MASK_EOI, 1);

	//! always send end-of-interrupt to primary pic
	i86_pic_send_command(I86_PIC_OCW2_MASK_EOI, 0);
}