minix/include/ibm/interrupt.h
2005-04-21 14:53:53 +00:00

62 lines
2.5 KiB
C

/* Interrupt numbers and hardware vectors. */
#ifndef _INTERRUPT_H
#define _INTERRUPT_H
#if (CHIP == INTEL)
/* 8259A interrupt controller ports. */
#define INT_CTL 0x20 /* I/O port for interrupt controller */
#define INT_CTLMASK 0x21 /* setting bits in this port disables ints */
#define INT2_CTL 0xA0 /* I/O port for second interrupt controller */
#define INT2_CTLMASK 0xA1 /* setting bits in this port disables ints */
/* Magic numbers for interrupt controller. */
#define ENABLE 0x20 /* code used to re-enable after an interrupt */
/* Interrupt vectors defined/reserved by processor. */
#define DIVIDE_VECTOR 0 /* divide error */
#define DEBUG_VECTOR 1 /* single step (trace) */
#define NMI_VECTOR 2 /* non-maskable interrupt */
#define BREAKPOINT_VECTOR 3 /* software breakpoint */
#define OVERFLOW_VECTOR 4 /* from INTO */
/* Fixed system call vector. */
#define SYS_VECTOR 32 /* system calls are made with int SYSVEC */
#define SYS386_VECTOR 33 /* except 386 system calls use this */
#define LEVEL0_VECTOR 34 /* for execution of a function at level 0 */
/* Suitable irq bases for hardware interrupts. Reprogram the 8259(s) from
* the PC BIOS defaults since the BIOS doesn't respect all the processor's
* reserved vectors (0 to 31).
*/
#define BIOS_IRQ0_VEC 0x08 /* base of IRQ0-7 vectors used by BIOS */
#define BIOS_IRQ8_VEC 0x70 /* base of IRQ8-15 vectors used by BIOS */
#define IRQ0_VECTOR 0x50 /* nice vectors to relocate IRQ0-7 to */
#define IRQ8_VECTOR 0x70 /* no need to move IRQ8-15 */
/* Hardware interrupt numbers. */
#define NR_IRQ_VECTORS 16
#define CLOCK_IRQ 0
#define KEYBOARD_IRQ 1
#define CASCADE_IRQ 2 /* cascade enable for 2nd AT controller */
#define ETHER_IRQ 3 /* default ethernet interrupt vector */
#define SECONDARY_IRQ 3 /* RS232 interrupt vector for port 2 */
#define RS232_IRQ 4 /* RS232 interrupt vector for port 1 */
#define XT_WINI_IRQ 5 /* xt winchester */
#define FLOPPY_IRQ 6 /* floppy disk */
#define PRINTER_IRQ 7
#define AT_WINI_0_IRQ 14 /* at winchester controller 0 */
#define AT_WINI_1_IRQ 15 /* at winchester controller 1 */
/* Interrupt number to hardware vector. */
#define BIOS_VECTOR(irq) \
(((irq) < 8 ? BIOS_IRQ0_VEC : BIOS_IRQ8_VEC) + ((irq) & 0x07))
#define VECTOR(irq) \
(((irq) < 8 ? IRQ0_VECTOR : IRQ8_VECTOR) + ((irq) & 0x07))
#endif /* (CHIP == INTEL) */
#endif /* _INTERRUPT_H */