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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. * */ #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) */ /* * The maximum number of vectors supported by i386 processors * is limited to 256. For processors other than i386, NR_VECTORS * should be changed accordingly. */ #define NR_VECTORS 256 #include "irq_vectors_limits.h" #define FPU_IRQ 13 #define FIRST_VM86_IRQ 3 #define LAST_VM86_IRQ 15 #define invalid_vm86_irq(irq) ((irq) < 3 || (irq) > 15) #endif /* _ASM_IRQ_VECTORS_H */