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/*
* This file should contain #defines for all of the interrupt vector
* numbers used by this architecture.
*
* In addition, there are some standard defines:
*
* FIRST_EXTERNAL_VECTOR:
* The first free place for external interrupts
*
* SYSCALL_VECTOR:
* The IRQ vector a syscall makes the user to kernel transition
* under.
*
* TIMER_IRQ:
* The IRQ number the timer interrupt comes in at.
*
* NR_IRQS:
* The total number of interrupt vectors (including all the
* architecture specific interrupts) needed.
*
* NR_IRQ_VECTORS:
* The total number of IO APIC vector inputs
*
*/
#ifndef _ASM_IRQ_VECTORS_H
#define _ASM_IRQ_VECTORS_H
/*
* IDT vectors usable for external interrupt sources start
* at 0x20:
*/
#define FIRST_EXTERNAL_VECTOR 0x20
#define SYSCALL_VECTOR 0x80
/*
* Vectors 0x20-0x2f are used for ISA interrupts.
*/
/*
* Special IRQ vectors used by the SMP architecture, 0xf0-0xff
*
* some of the following vectors are 'rare', they are merged
* into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
* TLB, reschedule and local APIC vectors are performance-critical.
*
* Vectors 0xf0-0xfa are free (reserved for future Linux use).
*/
#define SPURIOUS_APIC_VECTOR 0xff
#define ERROR_APIC_VECTOR 0xfe
#define INVALIDATE_TLB_VECTOR 0xfd
#define RESCHEDULE_VECTOR 0xfc
#define CALL_FUNCTION_VECTOR 0xfb
#define THERMAL_APIC_VECTOR 0xf0
/*
* Local APIC timer IRQ vector is on a different priority level,
* to work around the 'lost local interrupt if more than 2 IRQ
* sources per level' errata.
*/
#define LOCAL_TIMER_VECTOR 0xef
/*
* First APIC vector available to drivers: (vectors 0x30-0xee)
* we start at 0x31 to spread out vectors evenly between priority
* levels. (0x80 is the syscall vector)
*/
#define FIRST_DEVICE_VECTOR 0x31
#define FIRST_SYSTEM_VECTOR 0xef
#define TIMER_IRQ 0
/*
* 16 8259A IRQ's, 208 potential APIC interrupt sources.
* Right now the APIC is mostly only used for SMP.
* 256 vectors is an architectural limit. (we can have
* more than 256 devices theoretically, but they will
* have to use shared interrupts)
* Since vectors 0x00-0x1f are used/reserved for the CPU,
* the usable vector space is 0x20-0xff (224 vectors)
*/
#ifdef CONFIG_X86_IO_APIC
#define NR_IRQS 224
#else
#define NR_IRQS 16
#endif
#define NR_IRQ_VECTORS NR_IRQS
#define FPU_IRQ 8
#define FIRST_VM86_IRQ 2
#define LAST_VM86_IRQ 15
#define invalid_vm86_irq(irq) ((irq) < 2 || (irq) == 7 || (irq) > 15)
#endif /* _ASM_IRQ_VECTORS_H */