cf9a4ec79b
Coverity was flagging a recursive include between kernel.h and cpulocals.h. As cpulocals.h also included proc.h, we can move that include statement into kernel.h, and clean up the source files' include statements accordingly.
82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
/* This file contains routines for initializing the 8259 interrupt controller:
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* put_irq_handler: register an interrupt handler
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* rm_irq_handler: deregister an interrupt handler
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* intr_handle: handle a hardware interrupt
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* intr_init: initialize the interrupt controller(s)
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*/
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#include "kernel/kernel.h"
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#include "arch_proto.h"
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#include "hw_intr.h"
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#include <minix/portio.h>
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#include <machine/cpu.h>
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#define ICW1_AT 0x11 /* edge triggered, cascade, need ICW4 */
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#define ICW1_PC 0x13 /* edge triggered, no cascade, need ICW4 */
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#define ICW1_PS 0x19 /* level triggered, cascade, need ICW4 */
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#define ICW4_AT_SLAVE 0x01 /* not SFNM, not buffered, normal EOI, 8086 */
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#define ICW4_AT_MASTER 0x05 /* not SFNM, not buffered, normal EOI, 8086 */
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#define ICW4_PC_SLAVE 0x09 /* not SFNM, buffered, normal EOI, 8086 */
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#define ICW4_PC_MASTER 0x0D /* not SFNM, buffered, normal EOI, 8086 */
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#define ICW4_AT_AEOI_SLAVE 0x03 /* not SFNM, not buffered, auto EOI, 8086 */
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#define ICW4_AT_AEOI_MASTER 0x07 /* not SFNM, not buffered, auto EOI, 8086 */
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#define ICW4_PC_AEOI_SLAVE 0x0B /* not SFNM, buffered, auto EOI, 8086 */
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#define ICW4_PC_AEOI_MASTER 0x0F /* not SFNM, buffered, auto EOI, 8086 */
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/*===========================================================================*
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* intr_init *
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*===========================================================================*/
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int intr_init(const int auto_eoi)
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{
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/* Initialize the 8259s, finishing with all interrupts disabled. */
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outb( INT_CTL, ICW1_AT);
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outb( INT_CTLMASK, IRQ0_VECTOR);
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/* ICW2 for master */
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outb( INT_CTLMASK, (1 << CASCADE_IRQ));
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/* ICW3 tells slaves */
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if (auto_eoi)
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outb( INT_CTLMASK, ICW4_AT_AEOI_MASTER);
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else
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outb( INT_CTLMASK, ICW4_AT_MASTER);
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outb( INT_CTLMASK, ~(1 << CASCADE_IRQ)); /* IRQ 0-7 mask */
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outb( INT2_CTL, ICW1_AT);
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outb( INT2_CTLMASK, IRQ8_VECTOR);
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/* ICW2 for slave */
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outb( INT2_CTLMASK, CASCADE_IRQ); /* ICW3 is slave nr */
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if (auto_eoi)
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outb( INT2_CTLMASK, ICW4_AT_AEOI_SLAVE);
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else
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outb( INT2_CTLMASK, ICW4_AT_SLAVE);
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outb( INT2_CTLMASK, ~0); /* IRQ 8-15 mask */
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return OK;
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}
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void irq_8259_unmask(const int irq)
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{
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const unsigned ctl_mask = irq < 8 ? INT_CTLMASK : INT2_CTLMASK;
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outb(ctl_mask, inb(ctl_mask) & ~(1 << (irq & 0x7)));
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}
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void irq_8259_mask(const int irq)
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{
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const unsigned ctl_mask = irq < 8 ? INT_CTLMASK : INT2_CTLMASK;
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outb(ctl_mask, inb(ctl_mask) | (1 << (irq & 0x7)));
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}
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/* Disable 8259 - write 0xFF in OCW1 master and slave. */
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void i8259_disable(void)
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{
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outb(INT2_CTLMASK, 0xFF);
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outb(INT_CTLMASK, 0xFF);
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inb(INT_CTLMASK);
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}
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void irq_8259_eoi(int irq)
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{
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if (irq < 8)
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eoi_8259_master();
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else
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eoi_8259_slave();
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}
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