1 // Helpers for working with i8259 interrupt controller.
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2002 MandrakeSoft S.A.
6 // This file may be distributed under the terms of the GNU LGPLv3 license.
8 #include "pic.h" // get_pic1_isr
9 #include "util.h" // dprintf
10 #include "config.h" // CONFIG_*
13 set_pics(u8 irq0, u8 irq8)
15 // Send ICW1 (select OCW1 + will send ICW4)
16 outb(0x11, PORT_PIC1_CMD);
17 outb(0x11, PORT_PIC2_CMD);
18 // Send ICW2 (base irqs: 0x08-0x0f for irq0-7, 0x70-0x77 for irq8-15)
19 outb(irq0, PORT_PIC1_DATA);
20 outb(irq8, PORT_PIC2_DATA);
21 // Send ICW3 (cascaded pic ids)
22 outb(0x04, PORT_PIC1_DATA);
23 outb(0x02, PORT_PIC2_DATA);
24 // Send ICW4 (enable 8086 mode)
25 outb(0x01, PORT_PIC1_DATA);
26 outb(0x01, PORT_PIC2_DATA);
27 // Mask all irqs (except cascaded PIC2 irq)
28 outb(~PIC1_IRQ2, PORT_PIC1_DATA);
29 outb(~0, PORT_PIC2_DATA);
35 dprintf(3, "init pic\n");
39 // Handler for otherwise unused hardware irqs.
41 handle_hwpic1(struct bregs *regs)
43 dprintf(DEBUG_ISR_hwpic1, "handle_hwpic1 irq=%x\n", get_pic1_isr());
48 handle_hwpic2(struct bregs *regs)
50 dprintf(DEBUG_ISR_hwpic2, "handle_hwpic2 irq=%x\n", get_pic2_isr());