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Kevin O'Connorc541e1b2008-06-21 12:24:14 -04001// Helpers for working with i8259 interrupt controller.
2//
3// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4// Copyright (C) 2002 MandrakeSoft S.A.
5//
Kevin O'Connorb1b7c2a2009-01-15 20:52:58 -05006// This file may be distributed under the terms of the GNU LGPLv3 license.
Kevin O'Connorc541e1b2008-06-21 12:24:14 -04007
Kevin O'Connor9521e262008-07-04 13:04:29 -04008#include "pic.h" // get_pic1_isr
9#include "util.h" // dprintf
10#include "config.h" // CONFIG_*
Kevin O'Connorc541e1b2008-06-21 12:24:14 -040011
12void
13pic_setup()
14{
15 dprintf(3, "init pic\n");
16 // Send ICW1 (select OCW1 + will send ICW4)
17 outb(0x11, PORT_PIC1_CMD);
18 outb(0x11, PORT_PIC2_CMD);
Kevin O'Connor65e63422008-07-19 14:12:32 -040019 // Send ICW2 (base irqs: 0x08-0x0f for irq0-7, 0x70-0x77 for irq8-15)
Kevin O'Connorc541e1b2008-06-21 12:24:14 -040020 outb(0x08, PORT_PIC1_DATA);
21 outb(0x70, PORT_PIC2_DATA);
22 // Send ICW3 (cascaded pic ids)
23 outb(0x04, PORT_PIC1_DATA);
24 outb(0x02, PORT_PIC2_DATA);
25 // Send ICW4 (enable 8086 mode)
26 outb(0x01, PORT_PIC1_DATA);
27 outb(0x01, PORT_PIC2_DATA);
28 // Mask all irqs (except cascaded PIC2 irq)
29 outb(~PIC1_IRQ2, PORT_PIC1_DATA);
30 outb(~0, PORT_PIC2_DATA);
31}
32
33// Handler for otherwise unused hardware irqs.
34void VISIBLE16
Kevin O'Connorffdc9ee2008-12-20 13:10:00 -050035handle_hwpic1(struct bregs *regs)
Kevin O'Connorc541e1b2008-06-21 12:24:14 -040036{
Kevin O'Connoreac894d2009-02-05 21:23:39 -050037 dprintf(DEBUG_ISR_hwpic1, "handle_hwpic1 irq=%x\n", get_pic1_isr());
Kevin O'Connorffdc9ee2008-12-20 13:10:00 -050038 eoi_pic1();
39}
Kevin O'Connorc541e1b2008-06-21 12:24:14 -040040
Kevin O'Connorffdc9ee2008-12-20 13:10:00 -050041void VISIBLE16
42handle_hwpic2(struct bregs *regs)
43{
Kevin O'Connoreac894d2009-02-05 21:23:39 -050044 dprintf(DEBUG_ISR_hwpic2, "handle_hwpic2 irq=%x\n", get_pic2_isr());
Kevin O'Connorffdc9ee2008-12-20 13:10:00 -050045 eoi_pic2();
Kevin O'Connorc541e1b2008-06-21 12:24:14 -040046}