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.
10 #include "ioport.h" // PORT_PIC*
13 #define PIC1_IRQ0 (1<<0)
14 #define PIC1_IRQ1 (1<<1)
15 #define PIC1_IRQ2 (1<<2)
16 #define PIC1_IRQ5 (1<<5)
17 #define PIC1_IRQ6 (1<<6)
19 #define PIC2_IRQ8 (1<<0)
20 #define PIC2_IRQ12 (1<<4)
21 #define PIC2_IRQ13 (1<<5)
22 #define PIC2_IRQ14 (1<<6)
27 // Send eoi (select OCW2 + eoi)
28 outb(0x20, PORT_PIC1_CMD);
34 // Send eoi (select OCW2 + eoi)
35 outb(0x20, PORT_PIC2_CMD);
42 outb(inb(PORT_PIC1_DATA) & ~irq, PORT_PIC1_DATA);
48 outb(inb(PORT_PIC2_DATA) & ~irq, PORT_PIC2_DATA);
54 outb(inb(PORT_PIC1_DATA) | irq, PORT_PIC1_DATA);
60 outb(inb(PORT_PIC2_DATA) | irq, PORT_PIC2_DATA);
66 // 0x0b == select OCW1 + read ISR
67 outb(0x0b, PORT_PIC1_CMD);
68 return inb(PORT_PIC1_CMD);
74 // 0x0b == select OCW1 + read ISR
75 outb(0x0b, PORT_PIC2_CMD);
76 return inb(PORT_PIC2_CMD);
80 void __set_irq(int vector, void *loc);
83 __enable_hwirq(int hwirq, void (*func)(void))
87 unmask_pic1(1 << hwirq);
88 vector = 0x08 + hwirq;
90 unmask_pic2(1 << (hwirq - 8));
91 vector = 0x70 + hwirq - 8;
93 __set_irq(vector, func);
96 #define enable_hwirq(irq, func) do { \
97 extern void func (void); \
98 __enable_hwirq(irq, func); \