FreeBSD/Linux Kernel Cross Reference
sys/include/ibm/interrupt.h

     /* 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 END_OF_INT      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 */

Cache object: fa8859d14a27c672b112252ee46947e3