| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file should contain #defines for all of the interrupt vector |
| 3 | * numbers used by this architecture. |
| 4 | * |
| 5 | * In addition, there are some standard defines: |
| 6 | * |
| 7 | * FIRST_EXTERNAL_VECTOR: |
| 8 | * The first free place for external interrupts |
| 9 | * |
| 10 | * SYSCALL_VECTOR: |
| 11 | * The IRQ vector a syscall makes the user to kernel transition |
| 12 | * under. |
| 13 | * |
| 14 | * TIMER_IRQ: |
| 15 | * The IRQ number the timer interrupt comes in at. |
| 16 | * |
| 17 | * NR_IRQS: |
| 18 | * The total number of interrupt vectors (including all the |
| 19 | * architecture specific interrupts) needed. |
| 20 | * |
| 21 | */ |
| 22 | #ifndef _ASM_IRQ_VECTORS_H |
| 23 | #define _ASM_IRQ_VECTORS_H |
| 24 | |
| 25 | /* |
| 26 | * IDT vectors usable for external interrupt sources start |
| 27 | * at 0x20: |
| 28 | */ |
| 29 | #define FIRST_EXTERNAL_VECTOR 0x20 |
| 30 | |
| 31 | #define SYSCALL_VECTOR 0x80 |
| 32 | |
| 33 | /* |
| 34 | * Vectors 0x20-0x2f are used for ISA interrupts. |
| 35 | */ |
| 36 | |
| 37 | /* |
| 38 | * Special IRQ vectors used by the SMP architecture, 0xf0-0xff |
| 39 | * |
| 40 | * some of the following vectors are 'rare', they are merged |
| 41 | * into a single vector (CALL_FUNCTION_VECTOR) to save vector space. |
| 42 | * TLB, reschedule and local APIC vectors are performance-critical. |
| 43 | * |
| 44 | * Vectors 0xf0-0xfa are free (reserved for future Linux use). |
| 45 | */ |
| 46 | #define SPURIOUS_APIC_VECTOR 0xff |
| 47 | #define ERROR_APIC_VECTOR 0xfe |
| 48 | #define INVALIDATE_TLB_VECTOR 0xfd |
| 49 | #define RESCHEDULE_VECTOR 0xfc |
| 50 | #define CALL_FUNCTION_VECTOR 0xfb |
| 51 | |
| 52 | #define THERMAL_APIC_VECTOR 0xf0 |
| 53 | /* |
| 54 | * Local APIC timer IRQ vector is on a different priority level, |
| 55 | * to work around the 'lost local interrupt if more than 2 IRQ |
| 56 | * sources per level' errata. |
| 57 | */ |
| 58 | #define LOCAL_TIMER_VECTOR 0xef |
| 59 | |
| 60 | /* |
| 61 | * First APIC vector available to drivers: (vectors 0x30-0xee) |
| 62 | * we start at 0x31 to spread out vectors evenly between priority |
| 63 | * levels. (0x80 is the syscall vector) |
| 64 | */ |
| 65 | #define FIRST_DEVICE_VECTOR 0x31 |
| 66 | #define FIRST_SYSTEM_VECTOR 0xef |
| 67 | |
| 68 | #define TIMER_IRQ 0 |
| 69 | |
| 70 | /* |
| 71 | * 16 8259A IRQ's, 208 potential APIC interrupt sources. |
| 72 | * Right now the APIC is mostly only used for SMP. |
| 73 | * 256 vectors is an architectural limit. (we can have |
| 74 | * more than 256 devices theoretically, but they will |
| 75 | * have to use shared interrupts) |
| 76 | * Since vectors 0x00-0x1f are used/reserved for the CPU, |
| 77 | * the usable vector space is 0x20-0xff (224 vectors) |
| 78 | */ |
| 79 | |
| 80 | /* |
| 81 | * The maximum number of vectors supported by i386 processors |
| 82 | * is limited to 256. For processors other than i386, NR_VECTORS |
| 83 | * should be changed accordingly. |
| 84 | */ |
| 85 | #define NR_VECTORS 256 |
| 86 | |
| 87 | #include "irq_vectors_limits.h" |
| 88 | |
| 89 | #define FPU_IRQ 13 |
| 90 | |
| 91 | #define FIRST_VM86_IRQ 3 |
| 92 | #define LAST_VM86_IRQ 15 |
| 93 | #define invalid_vm86_irq(irq) ((irq) < 3 || (irq) > 15) |
| 94 | |
| 95 | |
| 96 | #endif /* _ASM_IRQ_VECTORS_H */ |