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97 lines
2.5 KiB
97 lines
2.5 KiB
20 years ago
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/*
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* This file should contain #defines for all of the interrupt vector
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* numbers used by this architecture.
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*
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* In addition, there are some standard defines:
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*
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* FIRST_EXTERNAL_VECTOR:
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* The first free place for external interrupts
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*
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* SYSCALL_VECTOR:
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* The IRQ vector a syscall makes the user to kernel transition
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* under.
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*
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* TIMER_IRQ:
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* The IRQ number the timer interrupt comes in at.
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*
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* NR_IRQS:
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* The total number of interrupt vectors (including all the
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* architecture specific interrupts) needed.
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*
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*/
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#ifndef _ASM_IRQ_VECTORS_H
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#define _ASM_IRQ_VECTORS_H
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/*
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* IDT vectors usable for external interrupt sources start
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* at 0x20:
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*/
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#define FIRST_EXTERNAL_VECTOR 0x20
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#define SYSCALL_VECTOR 0x80
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/*
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* Vectors 0x20-0x2f are used for ISA interrupts.
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*/
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/*
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* Special IRQ vectors used by the SMP architecture, 0xf0-0xff
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*
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* some of the following vectors are 'rare', they are merged
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* into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
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* TLB, reschedule and local APIC vectors are performance-critical.
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*
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* Vectors 0xf0-0xfa are free (reserved for future Linux use).
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*/
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#define SPURIOUS_APIC_VECTOR 0xff
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#define ERROR_APIC_VECTOR 0xfe
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#define INVALIDATE_TLB_VECTOR 0xfd
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#define RESCHEDULE_VECTOR 0xfc
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#define CALL_FUNCTION_VECTOR 0xfb
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#define THERMAL_APIC_VECTOR 0xf0
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/*
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* Local APIC timer IRQ vector is on a different priority level,
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* to work around the 'lost local interrupt if more than 2 IRQ
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* sources per level' errata.
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*/
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#define LOCAL_TIMER_VECTOR 0xef
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/*
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* First APIC vector available to drivers: (vectors 0x30-0xee)
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* we start at 0x31 to spread out vectors evenly between priority
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* levels. (0x80 is the syscall vector)
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*/
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#define FIRST_DEVICE_VECTOR 0x31
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#define FIRST_SYSTEM_VECTOR 0xef
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#define TIMER_IRQ 0
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/*
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* 16 8259A IRQ's, 208 potential APIC interrupt sources.
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* Right now the APIC is mostly only used for SMP.
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* 256 vectors is an architectural limit. (we can have
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* more than 256 devices theoretically, but they will
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* have to use shared interrupts)
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* Since vectors 0x00-0x1f are used/reserved for the CPU,
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* the usable vector space is 0x20-0xff (224 vectors)
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*/
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/*
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* The maximum number of vectors supported by i386 processors
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* is limited to 256. For processors other than i386, NR_VECTORS
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* should be changed accordingly.
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*/
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#define NR_VECTORS 256
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#include "irq_vectors_limits.h"
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#define FPU_IRQ 13
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#define FIRST_VM86_IRQ 3
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#define LAST_VM86_IRQ 15
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#define invalid_vm86_irq(irq) ((irq) < 3 || (irq) > 15)
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#endif /* _ASM_IRQ_VECTORS_H */
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