Remove building with NOCRYPTO option
[minix3.git] / minix / kernel / arch / i386 / i8259.c
blob53327f2a6b2655b8adde41f2b43538458869f6d7
1 /* This file contains routines for initializing the 8259 interrupt controller:
2 * put_irq_handler: register an interrupt handler
3 * rm_irq_handler: deregister an interrupt handler
4 * intr_handle: handle a hardware interrupt
5 * intr_init: initialize the interrupt controller(s)
6 */
8 #include "kernel/kernel.h"
9 #include "arch_proto.h"
10 #include "hw_intr.h"
11 #include <machine/cpu.h>
13 #define ICW1_AT 0x11 /* edge triggered, cascade, need ICW4 */
14 #define ICW1_PC 0x13 /* edge triggered, no cascade, need ICW4 */
15 #define ICW1_PS 0x19 /* level triggered, cascade, need ICW4 */
16 #define ICW4_AT_SLAVE 0x01 /* not SFNM, not buffered, normal EOI, 8086 */
17 #define ICW4_AT_MASTER 0x05 /* not SFNM, not buffered, normal EOI, 8086 */
18 #define ICW4_PC_SLAVE 0x09 /* not SFNM, buffered, normal EOI, 8086 */
19 #define ICW4_PC_MASTER 0x0D /* not SFNM, buffered, normal EOI, 8086 */
20 #define ICW4_AT_AEOI_SLAVE 0x03 /* not SFNM, not buffered, auto EOI, 8086 */
21 #define ICW4_AT_AEOI_MASTER 0x07 /* not SFNM, not buffered, auto EOI, 8086 */
22 #define ICW4_PC_AEOI_SLAVE 0x0B /* not SFNM, buffered, auto EOI, 8086 */
23 #define ICW4_PC_AEOI_MASTER 0x0F /* not SFNM, buffered, auto EOI, 8086 */
25 /*===========================================================================*
26 * intr_init *
27 *===========================================================================*/
28 int intr_init(const int auto_eoi)
30 /* Initialize the 8259s, finishing with all interrupts disabled. */
31 outb( INT_CTL, ICW1_AT);
32 outb( INT_CTLMASK, IRQ0_VECTOR);
33 /* ICW2 for master */
34 outb( INT_CTLMASK, (1 << CASCADE_IRQ));
35 /* ICW3 tells slaves */
36 if (auto_eoi)
37 outb( INT_CTLMASK, ICW4_AT_AEOI_MASTER);
38 else
39 outb( INT_CTLMASK, ICW4_AT_MASTER);
40 outb( INT_CTLMASK, ~(1 << CASCADE_IRQ)); /* IRQ 0-7 mask */
41 outb( INT2_CTL, ICW1_AT);
42 outb( INT2_CTLMASK, IRQ8_VECTOR);
43 /* ICW2 for slave */
44 outb( INT2_CTLMASK, CASCADE_IRQ); /* ICW3 is slave nr */
45 if (auto_eoi)
46 outb( INT2_CTLMASK, ICW4_AT_AEOI_SLAVE);
47 else
48 outb( INT2_CTLMASK, ICW4_AT_SLAVE);
49 outb( INT2_CTLMASK, ~0); /* IRQ 8-15 mask */
51 return OK;
54 void irq_8259_unmask(const int irq)
56 const unsigned ctl_mask = irq < 8 ? INT_CTLMASK : INT2_CTLMASK;
57 outb(ctl_mask, inb(ctl_mask) & ~(1 << (irq & 0x7)));
60 void irq_8259_mask(const int irq)
62 const unsigned ctl_mask = irq < 8 ? INT_CTLMASK : INT2_CTLMASK;
63 outb(ctl_mask, inb(ctl_mask) | (1 << (irq & 0x7)));
66 /* Disable 8259 - write 0xFF in OCW1 master and slave. */
67 void i8259_disable(void)
69 outb(INT2_CTLMASK, 0xFF);
70 outb(INT_CTLMASK, 0xFF);
71 inb(INT_CTLMASK);
74 void irq_8259_eoi(int irq)
76 if (irq < 8)
77 eoi_8259_master();
78 else
79 eoi_8259_slave();